Adding upstream version 1.15.

Signed-off-by: Daniel Baumann <daniel@debian.org>

AUTHORS

@@ -1,7 +1,7 @@
 Lzlib was written by Antonio Diaz Diaz.
 
 The ideas embodied in lzlib are due to (at least) the following people:
-Abraham Lempel and Jacob Ziv (for the LZ algorithm), Andrey Markov (for
-the definition of Markov chains), G.N.N. Martin (for the definition of
-range encoding), Igor Pavlov (for putting all the above together in
-LZMA), and Julian Seward (for bzip2's CLI).
+Abraham Lempel and Jacob Ziv (for the LZ algorithm), Andrei Markov (for the
+definition of Markov chains), G.N.N. Martin (for the definition of range
+encoding), Igor Pavlov (for putting all the above together in LZMA), and
+Julian Seward (for bzip2's CLI).

COPYING

@@ -1,338 +1,17 @@
-                    GNU GENERAL PUBLIC LICENSE
-                       Version 2, June 1991
+   Lzlib - Compression library for the lzip format
+   Copyright (C) Antonio Diaz Diaz.
 
- Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
- 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- Everyone is permitted to copy and distribute verbatim copies
- of this license document, but changing it is not allowed.
+   This library is free software. Redistribution and use in source and
+   binary forms, with or without modification, are permitted provided
+   that the following conditions are met:
 
-                            Preamble
+   1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions, and the following disclaimer.
 
-  The licenses for most software are designed to take away your
-freedom to share and change it.  By contrast, the GNU General Public
-License is intended to guarantee your freedom to share and change free
-software--to make sure the software is free for all its users.  This
-General Public License applies to most of the Free Software
-Foundation's software and to any other program whose authors commit to
-using it.  (Some other Free Software Foundation software is covered by
-the GNU Lesser General Public License instead.)  You can apply it to
-your programs, too.
+   2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions, and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
 
-  When we speak of free software, we are referring to freedom, not
-price.  Our General Public Licenses are designed to make sure that you
-have the freedom to distribute copies of free software (and charge for
-this service if you wish), that you receive source code or can get it
-if you want it, that you can change the software or use pieces of it
-in new free programs; and that you know you can do these things.
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-anyone to deny you these rights or to ask you to surrender the rights.
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-that everyone understands that there is no warranty for this free
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COPYING.GPL

@@ -0,0 +1,337 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Lesser General Public License instead.)  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
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+anyone to deny you these rights or to ask you to surrender the rights.
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+distribute copies of the software, or if you modify it.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must give the recipients all the rights that
+you have.  You must make sure that they, too, receive or can get the
+source code.  And you must show them these terms so they know their
+rights.
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+distribute and/or modify the software.
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+that everyone understands that there is no warranty for this free
+software.  If the software is modified by someone else and passed on, we
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+signed it.  However, nothing else grants you permission to modify or
+distribute the Program or its derivative works.  These actions are
+prohibited by law if you do not accept this License.  Therefore, by
+modifying or distributing the Program (or any work based on the
+Program), you indicate your acceptance of this License to do so, and
+all its terms and conditions for copying, distributing or modifying
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+infringement or for any other reason (not limited to patent issues),
+conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot
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+License and any other pertinent obligations, then as a consequence you
+may not distribute the Program at all.  For example, if a patent
+license would not permit royalty-free redistribution of the Program by
+all those who receive copies directly or indirectly through you, then
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+any particular circumstance, the balance of the section is intended to
+apply and the section as a whole is intended to apply in other
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+patents or other property right claims or to contest validity of any
+such claims; this section has the sole purpose of protecting the
+integrity of the free software distribution system, which is
+implemented by public license practices.  Many people have made
+generous contributions to the wide range of software distributed
+through that system in reliance on consistent application of that
+system; it is up to the author/donor to decide if he or she is willing
+to distribute software through any other system and a licensee cannot
+impose that choice.
+
+This section is intended to make thoroughly clear what is believed to
+be a consequence of the rest of this License.
+
+  8. If the distribution and/or use of the Program is restricted in
+certain countries either by patents or by copyrighted interfaces, the
+original copyright holder who places the Program under this License
+may add an explicit geographical distribution limitation excluding
+those countries, so that distribution is permitted only in or among
+countries not thus excluded.  In such case, this License incorporates
+the limitation as if written in the body of this License.
+
+  9. The Free Software Foundation may publish revised and/or new versions
+of the General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+Each version is given a distinguishing version number.  If the Program
+specifies a version number of this License which applies to it and "any
+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation.  If the Program does not specify a version number of
+this License, you may choose any version ever published by the Free Software
+Foundation.
+
+  10. If you wish to incorporate parts of the Program into other free
+programs whose distribution conditions are different, write to the author
+to ask for permission.  For software which is copyrighted by the Free
+Software Foundation, write to the Free Software Foundation; we sometimes
+make exceptions for this.  Our decision will be guided by the two goals
+of preserving the free status of all derivatives of our free software and
+of promoting the sharing and reuse of software generally.
+
+                            NO WARRANTY
+
+  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
+
+  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) <year>  <name of author>
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.

ChangeLog

@@ -1,38 +1,155 @@
+2025-01-09  Antonio Diaz Diaz  <antonio@gnu.org>
+
+	* Version 1.15 released.
+	* decoder.h (Rd_try_reload): Reject a nonzero first LZMA byte.
+	* minilzip.c (do_decompress): Reject empty member in multimember.
+	  (Pp_free): New function.
+	* lzlib.h: Declare LZ_Errno, LZ_Encoder, and LZ_Decoder as typedef.
+	* Makefile.in: New target 'lib' which builds just the library.
+	  New target 'bin' which builds the library and minilzip.
+	  'lib' is now the default; minilzip is no longer built by default.
+	  'install-bin' installs minilzip and its man page again.
+	* configure, Makefile.in: Use '--soname' conditionally.
+	  (Reported by Michael Sullivan).
+	* INSTALL: Document use of 'make bin'.
+	* check.sh: Use 'cp' instead of 'cat'.
+
+2024-01-20  Antonio Diaz Diaz  <antonio@gnu.org>
+
+	* Version 1.14 released.
+	* minilzip.c: Reformat file diagnostics as 'PROGRAM: FILE: MESSAGE'.
+	  (show_option_error): New function showing argument and option name.
+	  (main): Make -o preserve date/mode/owner if 1 input file.
+	* lzip.h: Rename verify_* to check_*.
+	* lzlib.texi: Document the need to declare uint8_t before lzlib.h.
+	  (Reported by Michal Górny).
+	* configure, Makefile.in: New variable 'MAKEINFO'.
+	* INSTALL: Document use of CFLAGS+='--std=c99 -D_XOPEN_SOURCE=500'.
+
+2022-01-23  Antonio Diaz Diaz  <antonio@gnu.org>
+
+	* Version 1.13 released.
+	* configure: Set variables AR and ARFLAGS. (Reported by Hoël Bézier).
+	* main.c: Rename to minilzip.c.
+	* minilzip.c (getnum): Show option name and valid range if error.
+	  (check_lib): Check that LZ_API_VERSION and LZ_version_string match.
+	* Improve several descriptions in manual, '--help', and man page.
+	* lzlib.texi: Change GNU Texinfo category to 'Compression'.
+	  (Reported by Alfred M. Szmidt).
+
+2021-01-02  Antonio Diaz Diaz  <antonio@gnu.org>
+
+	* Version 1.12 released.
+	* lzlib.h: Define LZ_API_VERSION as 1000 * major + minor. 1.12 = 1012.
+	  This change does not affect the soversion.
+	* lzlib.h, lzlib.c: New function LZ_api_version.
+	* LZd_try_verify_trailer: Return 2 if EOF at trailer or EOS marker.
+	* Decompression speed has been slightly increased.
+	* decoder.h: Increase 'rd_min_available_bytes' from 8 to 10.
+	* encoder_base.c (LZeb_try_sync_flush):
+	  Compensate for the increase in 'rd_min_available_bytes'.
+	* main.c (do_decompress): Fix false report about library stall.
+	  New option '--check-lib'.
+	  (main): Report an error if a file name is empty.
+	  Make '-o' behave like '-c', but writing to file instead of stdout.
+	  Make '-c' and '-o' check whether the output is a terminal only once.
+	  Do not open output if input is a terminal.
+	  Replace 'decompressed', 'compressed' with 'out', 'in' in output.
+	  Set a valid invocation_name even if argc == 0.
+	* lzlib.texi: Document the new way of checking the library version.
+          Document that 'LZ_(de)compress_close' and 'LZ_(de)compress_errno'
+          can be called with a null argument.
+	  Document that sync flush marker is not allowed in lzip files.
+	  Document the consequences of not calling 'LZ_decompress_finish'.
+	  Document that 'LZ_decompress_read' returns at least once per member.
+	  Document that 'LZ_(de)compress_read' can be called with a null
+	  buffer pointer argument.
+	  Real code examples for common uses have been added to the tutorial.
+	* bbexample.c: Don't use 'LZ_(de)compress_write_size'.
+	* lzcheck.c: New options '-s' (sync) and '-m' (member by member).
+	  Test member by member without 'LZ_decompress_finish'.
+	* ffexample.c: New file containing example functions for file-to-file
+	  compression/decompression.
+	* Document extraction from tar.lz in '--help' output and man page.
+	* Makefile.in: 'install-bin' no longer installs the man page.
+	  New targets 'install-bin-compress' and 'install-bin-strip-compress'.
+	* testsuite: Add 9 new test files.
+
+2019-01-02  Antonio Diaz Diaz  <antonio@gnu.org>
+
+	* Version 1.11 released.
+	* Rename File_* to Lzip_*.
+	* LZ_decompress_read: Don't return error until all data is read.
+	* decoder.c (LZd_decode_member): Decode truncated data until EOF.
+	* cbuffer.c (Cb_read_data): Allow a null buffer pointer.
+	* main.c: Don't allow mixing different operations (-d and -t).
+	* main.c: Check return value of close( infd ).
+	* main.c: Compile on DOS with DJGPP.
+	* lzlib.texi: Improve descriptions of '-0..-9', '-m', and '-s'.
+	  Document that 'LZ_(de)compress_finish' can be called repeatedly.
+	* configure: Accept appending to CFLAGS; 'CFLAGS+=OPTIONS'.
+	* Makefile.in: Rename targets 'install-bin*' to 'install-lib*'.
+	* Makefile.in: Targets 'install-bin*' now install minilzip.
+	* INSTALL: Document use of CFLAGS+='-D __USE_MINGW_ANSI_STDIO'.
+
+2018-02-07  Antonio Diaz Diaz  <antonio@gnu.org>
+
+	* Version 1.10 released.
+	* LZ_compress_finish now adjusts dictionary size for each member.
+	  (Older versions can adjust dictionary size only once).
+	* lzlib.c (LZ_decompress_read): Detect corrupt header with HD=3.
+	* main.c: New option '--loose-trailing'.
+	  (main): Make option '-S, --volume-size' keep input files.
+	  Replace 'bits/byte' with inverse compression ratio in output.
+	  (main): Show final diagnostic when testing multiple files.
+	  (set_c_outname): Do not add a second '.lz' to the arg of '-o'.
+	  (do_decompress): Show dictionary size at verbosity level 4 (-vvvv).
+	* lzlib.texi: New chapter 'Invoking minilzip'.
+
+2017-04-11  Antonio Diaz Diaz  <antonio@gnu.org>
+
+	* Version 1.9 released.
+	* Compression time of option '-0' has been reduced by 3%.
+	* Compression time of options -1 to -9 has been reduced by 1%.
+	* Decompression time has been reduced by 3%.
+	* main.c: Continue testing if any input file is a terminal.
+	* Change the license of the library to "2-clause BSD".
+
 2016-05-17  Antonio Diaz Diaz  <antonio@gnu.org>
 
 	* Version 1.8 released.
-	* decoder.c (LZd_verify_trailer): Removed test of final code.
-	* main.c: Added new option '-a, --trailing-error'.
-	* main.c (main): Delete '--output' file if infd is a terminal.
-	* main.c (main): Don't use stdin more than once.
+	* lzlib.h: Define LZ_API_VERSION to 1.
+	* lzlib.c (LZ_decompress_sync_to_member): Add skipped size to in_size.
+	* decoder.c (LZd_verify_trailer): Remove test of final code.
+	* main.c: New option '-a, --trailing-error'.
+	  (main): Delete '--output' file if infd is a terminal.
+	  (main): Don't use stdin more than once.
 	* configure: Avoid warning on some shells when testing for gcc.
 	* Makefile.in: Detect the existence of install-info.
-	* testsuite/check.sh: A POSIX shell is required to run the tests.
-	* testsuite/check.sh: Don't check error messages.
+	* check.sh: Require a POSIX shell. Don't check error messages.
 
 2015-07-08  Antonio Diaz Diaz  <antonio@gnu.org>
 
 	* Version 1.7 released.
-	* Ported fast encoder and option '-0' from lzip.
+	* Port fast encoder and option '-0' from lzip.
 	* If open-->write-->finish, produce same dictionary size as lzip.
-	* Makefile.in: Added new targets 'install*-compress'.
+	* Makefile.in: New targets 'install*-compress'.
 
 2014-08-27  Antonio Diaz Diaz  <antonio@gnu.org>
 
 	* Version 1.6 released.
-	* Compression ratio of option -9 has been slightly increased.
-	* configure: Added new option '--disable-static'.
-	* configure: Added new option '--disable-ldconfig'.
+	* Compression ratio of option '-9' has been slightly increased.
+	* configure: New options '--disable-static' and '--disable-ldconfig'.
 	* Makefile.in: Ignore errors from ldconfig.
 	* Makefile.in: Use 'CFLAGS' in every invocation of 'CC'.
 	* main.c (close_and_set_permissions): Behave like 'cp -p'.
-	* lzlib.texinfo: Renamed to lzlib.texi.
-	* License changed to "GPL version 2 or later with link exception".
+	* lzlib.texinfo: Rename to lzlib.texi.
+	* Change license to "GPL version 2 or later with link exception".
 
 2013-09-15  Antonio Diaz Diaz  <antonio@gnu.org>
 
 	* Version 1.5 released.
-	* Removed decompression support for version 0 files.
+	* Remove decompression support for version 0 files.
 	* The LZ_compress_sync_flush mechanism has been fixed (again).
 	* Minor fixes.
 
@@ -43,20 +160,19 @@
 	* Compression ratio has been slightly increased.
 	* Compression time has been reduced by 8%.
 	* Decompression time has been reduced by 7%.
-	* lzlib.h: Changed 'long long' values to 'unsigned long long'.
+	* lzlib.h: Change 'long long' values to 'unsigned long long'.
 	* encoder.c (Mf_init): Reduce minimum buffer size to 64KiB.
 	* lzlib.c (LZ_decompress_read): Tell LZ_header_error from
 	  LZ_unexpected_eof the same way as lzip does.
-	* Makefile.in: Added new target 'install-as-lzip'.
-	* Makefile.in: Added new target 'install-bin'.
-	* main.c: Use 'setmode' instead of '_setmode' on Windows and OS/2.
+	* Makefile.in: New targets 'install-as-lzip' and 'install-bin'.
 	* main.c: Define 'strtoull' to 'strtoul' on Windows.
+	  (main): Use 'setmode' instead of '_setmode' on Windows and OS/2.
 
 2012-02-29  Antonio Diaz Diaz  <ant_diaz@teleline.es>
 
 	* Version 1.3 released.
 	* Translated to C from the C++ source of lzlib 1.2.
-	* configure: 'datadir' renamed to 'datarootdir'.
+	* configure: Rename 'datadir' to 'datarootdir'.
 
 2011-10-25  Antonio Diaz Diaz  <ant_diaz@teleline.es>
 
@@ -65,12 +181,11 @@
 	  independently of the value of 'pos_state'. This gives better
 	  compression for large values of '--match-length' without being
 	  slower.
-	* encoder.h encoder.cc: Optimize pair price calculations. This
-	  reduces compression time for large values of '--match-length'
-	  by up to 6%.
-	* main.cc: Added new option '-F, --recompress'.
-	* Makefile.in: 'make install' no more tries to run
-	  '/sbin/ldconfig' on systems lacking it.
+	* encoder.h, encoder.cc: Optimize pair price calculations, reducing
+	  compression time for large values of '--match-length' by up to 6%.
+	* main.cc: New option '-F, --recompress'.
+	* Makefile.in: 'make install' no longer tries to run '/sbin/ldconfig'
+	  on systems lacking it.
 
 2011-01-03  Antonio Diaz Diaz  <ant_diaz@teleline.es>
 
@@ -78,24 +193,20 @@
 	* Compression time has been reduced by 2%.
 	* All declarations not belonging to the API have been
 	  encapsulated in the namespace 'Lzlib'.
-	* testsuite: 'test1' renamed to 'test.txt'. Added new tests.
-	* Match length limits set by options -1 to -9 of minilzip have
-	  been changed to match those of lzip 1.11.
-	* main.cc: Set stdin/stdout in binary mode on OS2.
+	* testsuite: Rename 'test1' to 'test.txt'. New tests.
+	* main.cc (main): Set match length limits to same values as lzip 1.11.
+	  (main): Set stdin/stdout in binary mode on OS2.
 	* bbexample.cc: New file containing example functions for
 	  buffer-to-buffer compression/decompression.
 
 2010-05-08  Antonio Diaz Diaz  <ant_diaz@teleline.es>
 
 	* Version 1.0 released.
-	* Added new function LZ_decompress_member_finished.
-	* Added new function LZ_decompress_member_version.
-	* Added new function LZ_decompress_dictionary_size.
-	* Added new function LZ_decompress_data_crc.
-	* Variables declared 'extern' have been encapsulated in a
-	  namespace.
-	* main.cc: Fixed warning about fchown's return value being ignored.
-	* decoder.h: Input_buffer integrated in Range_decoder.
+	* New functions LZ_decompress_member_version, LZ_decompress_data_crc,
+	  LZ_decompress_member_finished, and LZ_decompress_dictionary_size.
+	* Variables declared 'extern' have been encapsulated in a namespace.
+	* main.cc: Fix warning about fchown's return value being ignored.
+	* decoder.h: Integrate Input_buffer in Range_decoder.
 
 2010-02-10  Antonio Diaz Diaz  <ant_diaz@teleline.es>
 
@@ -106,28 +217,26 @@
 2010-01-17  Antonio Diaz Diaz  <ant_diaz@teleline.es>
 
 	* Version 0.8 released.
-	* Added new function LZ_decompress_reset.
-	* Added new function LZ_decompress_sync_to_member.
-	* Added new function LZ_decompress_write_size.
-	* Added new function LZ_strerror.
-	* lzlib.h: API change. Replaced 'enum' with functions for values
-	  of dictionary size limits to make interface names consistent.
-	* lzlib.h: API change. 'LZ_errno' replaced with 'LZ_Errno'.
-	* lzlib.h: API change. Replaced 'void *' with 'struct LZ_Encoder *'
+	* New functions LZ_decompress_reset, LZ_decompress_sync_to_member,
+	  LZ_decompress_write_size, and LZ_strerror.
+	* lzlib.h: API change. Replace 'enum' with functions for values of
+	  dictionary size limits to make interface names consistent.
+	* lzlib.h: API change. Rename 'LZ_errno' to 'LZ_Errno'.
+	* lzlib.h: API change. Replace 'void *' with 'struct LZ_Encoder *'
 	  and 'struct LZ_Decoder *' to make interface type safe.
-	* decoder.cc: Truncated member trailer is now correctly detected.
+	* decoder.cc: A truncated member trailer is now correctly detected.
 	* encoder.cc: Matchfinder::reset now also clears at_stream_end_,
 	  allowing LZ_compress_restart_member to restart a finished stream.
 	* lzlib.cc: Accept only query or close operations after a fatal
 	  error has occurred.
-	* Shared version of lzlib is no more built by default.
-	* testsuite/check.sh: Use 'test1' instead of 'COPYING' for testing.
+	* The shared version of lzlib is no longer built by default.
+	* check.sh: Use 'test1' instead of 'COPYING' for testing.
 
 2009-10-20  Antonio Diaz Diaz  <ant_diaz@teleline.es>
 
 	* Version 0.7 released.
 	* Compression time has been reduced by 4%.
-	* testsuite/check.sh: Removed -9 to run in less than 256MiB of RAM.
+	* check.sh: Remove -9 to run in less than 256MiB of RAM.
 	* lzcheck.cc: Read files of any size up to 2^63 bytes.
 
 2009-09-02  Antonio Diaz Diaz  <ant_diaz@teleline.es>
@@ -139,15 +248,14 @@
 
 	* Version 0.5 released.
 	* Decompression speed has been improved.
-	* main.cc (signal_handler): Declared as 'extern "C"'.
+	* main.cc (signal_handler): Declare as 'extern "C"'.
 
 2009-06-03  Antonio Diaz Diaz  <ant_diaz@teleline.es>
 
 	* Version 0.4 released.
-	* Added new function LZ_compress_sync_flush.
-	* Added new function LZ_compress_write_size.
+	* New functions LZ_compress_sync_flush and LZ_compress_write_size.
 	* Decompression speed has been improved.
-	* Added chapter 'Buffering' to the manual.
+	* lzlib.texinfo: New chapter 'Buffering'.
 
 2009-05-03  Antonio Diaz Diaz  <ant_diaz@teleline.es>
 
@@ -157,16 +265,15 @@
 2009-04-26  Antonio Diaz Diaz  <ant_diaz@teleline.es>
 
 	* Version 0.2 released.
-	* Fixed a segfault when decompressing trailing garbage.
-	* Fixed a false positive in LZ_(de)compress_finished.
+	* Fix a segfault when decompressing trailing garbage.
+	* Fix a false positive in LZ_(de)compress_finished.
 
 2009-04-21  Antonio Diaz Diaz  <ant_diaz@teleline.es>
 
 	* Version 0.1 released.
 
 
-Copyright (C) 2009-2016 Antonio Diaz Diaz.
+Copyright (C) 2009-2025 Antonio Diaz Diaz.
 
-This file is a collection of facts, and thus it is not copyrightable,
-but just in case, you have unlimited permission to copy, distribute and
-modify it.
+This file is a collection of facts, and thus it is not copyrightable, but just
+in case, you have unlimited permission to copy, distribute, and modify it.

INSTALL

@@ -1,9 +1,14 @@
 Requirements
 ------------
-You will need a C compiler.
-I use gcc 5.3.0 and 4.1.2, but the code should compile with any
-standards compliant compiler.
-Gcc is available at http://gcc.gnu.org.
+You will need a C99 compiler. (gcc 3.3.6 or newer is recommended).
+I use gcc 6.1.0 and 3.3.6, but the code should compile with any standards
+compliant compiler.
+Gcc is available at http://gcc.gnu.org
+Lzip is available at http://www.nongnu.org/lzip/lzip.html
+
+The operating system must allow signal handlers read access to objects with
+static storage duration so that the cleanup handler for Control-C can delete
+the partial output file. (This requirement is for minilzip only).
 
 
 Procedure
@@ -14,8 +19,8 @@ Procedure
 or
 	lzip -cd lzlib[version].tar.lz | tar -xf -
 
-This creates the directory ./lzlib[version] containing the source from
-the main archive.
+This creates the directory ./lzlib[version] containing the source code
+extracted from the archive.
 
 2. Change to lzlib directory and run configure.
    (Try 'configure --help' for usage instructions).
@@ -23,46 +28,65 @@ the main archive.
 	cd lzlib[version]
 	./configure
 
-3. Run make.
+   If you choose a C standard, enable the POSIX features explicitly:
+
+	./configure CFLAGS+='--std=c99 -D_XOPEN_SOURCE=500'
+
+   If you are compiling on MinGW, use:
+
+	./configure CFLAGS+='-D __USE_MINGW_ANSI_STDIO'
+
+3. Run make
 
 	make
 
+to build the library, or
+
+	make bin
+
+to build also minilzip.
+
 4. Optionally, type 'make check' to run the tests that come with lzlib.
 
 5. Type 'make install' to install the library and any data files and
-   documentation. (You may need to run ldconfig also).
+   documentation. You need root privileges to install into a prefix owned
+   by root. (You may need to run ldconfig also).
 
    Or type 'make install-compress', which additionally compresses the
-   info manual after installation. (Installing compressed docs may
-   become the default in the future).
+   info manual after installation.
+   (Installing compressed docs may become the default in the future).
 
-   You can install only the library, the info manual or the man page by
-   typing 'make install-bin', 'make install-info' or 'make install-man'
-   respectively.
+   You can install only the library or the info manual by typing
+   'make install-lib' or 'make install-info' respectively.
 
-   Instead of 'make install', you can type 'make install-as-lzip' to
-   install the library and any data files and documentation, and link
-   minilzip to the name 'lzip'.
+   'make install-bin' installs the program minilzip and its man page. It
+   installs a shared minilzip if the shared library has been configured.
+   Else it installs a static minilzip.
+   'make install-bin-compress' additionally compresses the man page after
+   installation.
+
+   'make install-as-lzip' runs 'make install-bin' and then links minilzip to
+   the name 'lzip'.
 
 
 Another way
 -----------
 You can also compile lzlib into a separate directory.
-To do this, you must use a version of 'make' that supports the 'VPATH'
-variable, such as GNU 'make'. 'cd' to the directory where you want the
+To do this, you must use a version of 'make' that supports the variable
+'VPATH', such as GNU 'make'. 'cd' to the directory where you want the
 object files and executables to go and run the 'configure' script.
-'configure' automatically checks for the source code in '.', in '..' and
+'configure' automatically checks for the source code in '.', in '..', and
 in the directory that 'configure' is in.
 
-'configure' recognizes the option '--srcdir=DIR' to control where to
-look for the sources. Usually 'configure' can determine that directory
+'configure' recognizes the option '--srcdir=DIR' to control where to look
+for the source code. Usually 'configure' can determine that directory
 automatically.
 
 After running 'configure', you can run 'make' and 'make install' as
 explained above.
 
 
-Copyright (C) 2009-2016 Antonio Diaz Diaz.
+Copyright (C) 2009-2025 Antonio Diaz Diaz.
 
 This file is free documentation: you have unlimited permission to copy,
-distribute and modify it.
+distribute, and modify it.

Makefile.in

@@ -1,44 +1,55 @@
 
 DISTNAME = $(pkgname)-$(pkgversion)
-AR = ar
 INSTALL = install
 INSTALL_PROGRAM = $(INSTALL) -m 755
-INSTALL_DATA = $(INSTALL) -m 644
 INSTALL_DIR = $(INSTALL) -d -m 755
+INSTALL_DATA = $(INSTALL) -m 644
+INSTALL_SO = $(INSTALL) -m 644
 LDCONFIG = /sbin/ldconfig
 SHELL = /bin/sh
 CAN_RUN_INSTALLINFO = $(SHELL) -c "install-info --version" > /dev/null 2>&1
 
-objs = carg_parser.o main.o
+objs = carg_parser.o minilzip.o
 
 
 .PHONY : all install install-bin install-info install-man \
          install-strip install-compress install-strip-compress \
          install-bin-strip install-info-compress install-man-compress \
-         install-as-lzip uninstall uninstall-bin uninstall-info uninstall-man \
+         install-bin-compress install-bin-strip-compress \
+         install-lib install-lib-strip \
+         install-as-lzip \
+         uninstall uninstall-bin uninstall-lib uninstall-info uninstall-man \
          doc info man check dist clean distclean
 
-all : $(progname_static) $(progname_shared)
+all : lib
+
+lib : $(libname_static) $(libname_shared)
 
 lib$(libname).a : lzlib.o
-	$(AR) -rcs $@ $<
+	$(AR) $(ARFLAGS) $@ $<
 
-lib$(libname).so.$(pkgversion) : lzlib_sh.o
-	$(CC) $(LDFLAGS) $(CFLAGS) -fpic -fPIC -shared -Wl,--soname=lib$(libname).so.$(soversion) -o $@ $<
+lib$(libname).so.$(soversion) : lzlib_sh.o
+	$(CC) $(CFLAGS) $(LDFLAGS) -fpic -fPIC -shared -Wl,--soname=$@ -o $@ $< || \
+	$(CC) $(CFLAGS) $(LDFLAGS) -fpic -fPIC -shared -o $@ $<
+
+bin : $(progname_static) $(progname_shared)
 
 $(progname) : $(objs) lib$(libname).a
-	$(CC) $(LDFLAGS) $(CFLAGS) -o $@ $(objs) lib$(libname).a
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $(objs) lib$(libname).a
 
-$(progname)_shared : $(objs) lib$(libname).so.$(pkgversion)
-	$(CC) $(LDFLAGS) $(CFLAGS) -o $@ $(objs) lib$(libname).so.$(pkgversion)
+$(progname)_shared : $(objs) lib$(libname).so.$(soversion)
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $(objs) lib$(libname).so.$(soversion)
 
 bbexample : bbexample.o lib$(libname).a
-	$(CC) $(LDFLAGS) $(CFLAGS) -o $@ bbexample.o lib$(libname).a
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ bbexample.o lib$(libname).a
+
+ffexample : ffexample.o lib$(libname).a
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ ffexample.o lib$(libname).a
 
 lzcheck : lzcheck.o lib$(libname).a
-	$(CC) $(LDFLAGS) $(CFLAGS) -o $@ lzcheck.o lib$(libname).a
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ lzcheck.o lib$(libname).a
 
-main.o : main.c
+minilzip.o : minilzip.c
 	$(CC) $(CPPFLAGS) $(CFLAGS) -DPROGVERSION=\"$(pkgversion)\" -c -o $@ $<
 
 lzlib_sh.o : lzlib.c
@@ -47,6 +58,11 @@ lzlib_sh.o : lzlib.c
 %.o : %.c
 	$(CC) $(CPPFLAGS) $(CFLAGS) -c -o $@ $<
 
+# prevent 'make' from trying to remake source files
+$(VPATH)/configure $(VPATH)/Makefile.in $(VPATH)/doc/$(pkgname).texi : ;
+MAKEFLAGS += -r
+.SUFFIXES :
+
 lzdeps = lzlib.h lzip.h cbuffer.c decoder.h decoder.c encoder_base.h \
          encoder_base.c encoder.h encoder.c fast_encoder.h fast_encoder.c
 
@@ -54,64 +70,73 @@ $(objs)       : Makefile
 carg_parser.o : carg_parser.h
 lzlib.o       : Makefile $(lzdeps)
 lzlib_sh.o    : Makefile $(lzdeps)
-main.o        : carg_parser.h lzlib.h
+minilzip.o    : carg_parser.h lzlib.h
 bbexample.o   : Makefile lzlib.h
+ffexample.o   : Makefile lzlib.h
 lzcheck.o     : Makefile lzlib.h
 
-
 doc : info man
 
 info : $(VPATH)/doc/$(pkgname).info
 
 $(VPATH)/doc/$(pkgname).info : $(VPATH)/doc/$(pkgname).texi
-	cd $(VPATH)/doc && makeinfo $(pkgname).texi
+	cd $(VPATH)/doc && $(MAKEINFO) $(pkgname).texi
 
 man : $(VPATH)/doc/$(progname).1
 
 $(VPATH)/doc/$(progname).1 : $(progname)
-	help2man -n 'reduces the size of files' -o $@ --no-info ./$(progname)
+	help2man -n 'reduces the size of files' -o $@ --info-page=$(pkgname) ./$(progname)
 
 Makefile : $(VPATH)/configure $(VPATH)/Makefile.in
 	./config.status
 
-check : $(progname) bbexample lzcheck
+check : $(progname) bbexample ffexample lzcheck
 	@$(VPATH)/testsuite/check.sh $(VPATH)/testsuite $(pkgversion)
 
-install : install-bin install-info
-install-strip : install-bin-strip install-info
-install-compress : install-bin install-info-compress
-install-strip-compress : install-bin-strip install-info-compress
+install : install-lib install-info
+install-strip : install-lib-strip install-info
+install-compress : install-lib install-info-compress
+install-strip-compress : install-lib-strip install-info-compress
+install-bin-compress : install-bin install-man-compress
+install-bin-strip-compress : install-bin-strip install-man-compress
 
-install-bin : all
+install-bin : bin install-man
+	if [ ! -d "$(DESTDIR)$(bindir)" ] ; then $(INSTALL_DIR) "$(DESTDIR)$(bindir)" ; fi
+	$(INSTALL_PROGRAM) ./$(progname_lzip) "$(DESTDIR)$(bindir)/$(progname)"
+
+install-bin-strip : bin
+	$(MAKE) INSTALL_PROGRAM='$(INSTALL_PROGRAM) -s' install-bin
+
+install-lib : lib
 	if [ ! -d "$(DESTDIR)$(includedir)" ] ; then $(INSTALL_DIR) "$(DESTDIR)$(includedir)" ; fi
 	if [ ! -d "$(DESTDIR)$(libdir)" ] ; then $(INSTALL_DIR) "$(DESTDIR)$(libdir)" ; fi
 	$(INSTALL_DATA) $(VPATH)/$(libname)lib.h "$(DESTDIR)$(includedir)/$(libname)lib.h"
-	if [ -n "$(progname_static)" ] ; then \
+	if [ -n "$(libname_static)" ] ; then \
 	  $(INSTALL_DATA) ./lib$(libname).a "$(DESTDIR)$(libdir)/lib$(libname).a" ; \
 	fi
-	if [ -n "$(progname_shared)" ] ; then \
-	  $(INSTALL_PROGRAM) ./lib$(libname).so.$(pkgversion) "$(DESTDIR)$(libdir)/lib$(libname).so.$(pkgversion)" ; \
+	if [ -n "$(libname_shared)" ] ; then \
 	  if [ -e "$(DESTDIR)$(libdir)/lib$(libname).so.$(soversion)" ] ; then \
 	    run_ldconfig=no ; \
 	  else run_ldconfig=yes ; \
 	  fi ; \
 	  rm -f "$(DESTDIR)$(libdir)/lib$(libname).so" ; \
 	  rm -f "$(DESTDIR)$(libdir)/lib$(libname).so.$(soversion)" ; \
+	  $(INSTALL_SO) ./lib$(libname).so.$(soversion) "$(DESTDIR)$(libdir)/lib$(libname).so.$(pkgversion)" ; \
 	  cd "$(DESTDIR)$(libdir)" && ln -s lib$(libname).so.$(pkgversion) lib$(libname).so ; \
 	  cd "$(DESTDIR)$(libdir)" && ln -s lib$(libname).so.$(pkgversion) lib$(libname).so.$(soversion) ; \
 	  if [ "${disable_ldconfig}" != yes ] && [ $${run_ldconfig} = yes ] && \
 	     [ -x "$(LDCONFIG)" ] ; then "$(LDCONFIG)" -n "$(DESTDIR)$(libdir)" || true ; fi ; \
 	fi
 
-install-bin-strip : all
-	$(MAKE) INSTALL_PROGRAM='$(INSTALL_PROGRAM) -s' install-bin
+install-lib-strip : lib
+	$(MAKE) INSTALL_SO='$(INSTALL_SO) -s' install-lib
 
 install-info :
 	if [ ! -d "$(DESTDIR)$(infodir)" ] ; then $(INSTALL_DIR) "$(DESTDIR)$(infodir)" ; fi
 	-rm -f "$(DESTDIR)$(infodir)/$(pkgname).info"*
 	$(INSTALL_DATA) $(VPATH)/doc/$(pkgname).info "$(DESTDIR)$(infodir)/$(pkgname).info"
 	-if $(CAN_RUN_INSTALLINFO) ; then \
-		install-info --info-dir="$(DESTDIR)$(infodir)" "$(DESTDIR)$(infodir)/$(pkgname).info" ; \
+	  install-info --info-dir="$(DESTDIR)$(infodir)" "$(DESTDIR)$(infodir)/$(pkgname).info" ; \
 	fi
 
 install-info-compress : install-info
@@ -125,25 +150,24 @@ install-man :
 install-man-compress : install-man
 	lzip -v -9 "$(DESTDIR)$(mandir)/man1/$(progname).1"
 
-install-as-lzip : install install-man
-	if [ ! -d "$(DESTDIR)$(bindir)" ] ; then $(INSTALL_DIR) "$(DESTDIR)$(bindir)" ; fi
-	$(INSTALL_PROGRAM) ./$(progname_lzip) "$(DESTDIR)$(bindir)/$(progname)"
+install-as-lzip : install-bin
 	-rm -f "$(DESTDIR)$(bindir)/lzip"
 	cd "$(DESTDIR)$(bindir)" && ln -s $(progname) lzip
 
-uninstall : uninstall-man uninstall-info uninstall-bin
+uninstall : uninstall-info uninstall-lib
 
 uninstall-bin :
 	-rm -f "$(DESTDIR)$(bindir)/$(progname)"
+
+uninstall-lib :
 	-rm -f "$(DESTDIR)$(includedir)/$(libname)lib.h"
 	-rm -f "$(DESTDIR)$(libdir)/lib$(libname).a"
 	-rm -f "$(DESTDIR)$(libdir)/lib$(libname).so"
 	-rm -f "$(DESTDIR)$(libdir)/lib$(libname).so.$(soversion)"
-	-rm -f "$(DESTDIR)$(libdir)/lib$(libname).so.$(pkgversion)"
 
 uninstall-info :
 	-if $(CAN_RUN_INSTALLINFO) ; then \
-		install-info --info-dir="$(DESTDIR)$(infodir)" --remove "$(DESTDIR)$(infodir)/$(pkgname).info" ; \
+	  install-info --info-dir="$(DESTDIR)$(infodir)" --remove "$(DESTDIR)$(infodir)/$(pkgname).info" ; \
 	fi
 	-rm -f "$(DESTDIR)$(infodir)/$(pkgname).info"*
 
@@ -155,6 +179,7 @@ dist : doc
 	tar -Hustar --owner=root --group=root -cvf $(DISTNAME).tar \
 	  $(DISTNAME)/AUTHORS \
 	  $(DISTNAME)/COPYING \
+	  $(DISTNAME)/COPYING.GPL \
 	  $(DISTNAME)/ChangeLog \
 	  $(DISTNAME)/INSTALL \
 	  $(DISTNAME)/Makefile.in \
@@ -164,20 +189,22 @@ dist : doc
 	  $(DISTNAME)/doc/$(progname).1 \
 	  $(DISTNAME)/doc/$(pkgname).info \
 	  $(DISTNAME)/doc/$(pkgname).texi \
+	  $(DISTNAME)/*.h \
+	  $(DISTNAME)/*.c \
 	  $(DISTNAME)/testsuite/check.sh \
 	  $(DISTNAME)/testsuite/test.txt \
-	  $(DISTNAME)/testsuite/test2.txt \
-	  $(DISTNAME)/testsuite/test.txt.lz \
+	  $(DISTNAME)/testsuite/fox_lf \
+	  $(DISTNAME)/testsuite/fox.lz \
+	  $(DISTNAME)/testsuite/fox_*.lz \
 	  $(DISTNAME)/testsuite/test_sync.lz \
-	  $(DISTNAME)/*.h \
-	  $(DISTNAME)/*.c
+	  $(DISTNAME)/testsuite/test.txt.lz
 	rm -f $(DISTNAME)
 	lzip -v -9 $(DISTNAME).tar
 
 clean :
-	-rm -f $(progname) $(objs)
-	-rm -f $(progname)_shared lzlib_sh.o *.so.$(pkgversion)
-	-rm -f bbexample bbexample.o lzcheck lzcheck.o lzlib.o *.a
+	-rm -f $(progname) $(objs) lzlib.o lib$(libname).a
+	-rm -f $(progname)_shared lzlib_sh.o lib$(libname).so*
+	-rm -f bbexample bbexample.o ffexample ffexample.o lzcheck lzcheck.o
 
 distclean : clean
 	-rm -f Makefile config.status *.tar *.tar.lz

NEWS

@@ -1,16 +1,21 @@
-Changes in version 1.8:
+Changes in version 1.15:
 
-The test of the value remaining in the range decoder has been removed.
-(After extensive testing it has been found useless to detect corruption
-in the decompressed data. Eliminating it reduces the number of false
-positives for corruption and makes error detection more accurate).
+Lzlib now reports a nonzero first LZMA byte as a LZ_data_error.
 
-The option "-a, --trailing-error", which makes minilzip exit with error
-status 2 if any remaining input is detected after decompressing the last
-member, has been added.
+minilzip now exits with error status 2 if any empty member is found in a
+multimember file.
 
-When decompressing with minilzip, the file specified with the '--output'
-option is now deleted if the input is a terminal.
+LZ_Errno, LZ_Encoder, and LZ_Decoder are now declared in lzlib.h as typedef.
 
-A harmless check failure on Windows, caused by the failed comparison of
-a message in text mode, has been fixed.
+The targets 'lib' and 'bin' have been added to Makefile.in. 'lib' is the new
+default and builds just the library. 'bin' builds both the library and
+minilzip.
+
+minilzip is no longer built by default.
+
+'install-bin' installs minilzip and its man page again.
+
+To improve portability, the linker option '--soname' is now used conditionally.
+(Reported by Michael Sullivan).
+
+The use of the target 'bin' has been documented in INSTALL.

README

@@ -1,97 +1,89 @@
+See the file INSTALL for compilation and installation instructions.
+
 Description
 
-Lzlib is a data compression library providing in-memory LZMA compression
-and decompression functions, including integrity checking of the
-decompressed data. The compressed data format used by the library is the
-lzip format. Lzlib is written in C.
+Lzlib is a data compression library providing in-memory LZMA compression and
+decompression functions, including integrity checking of the decompressed
+data. The compressed data format used by the library is the lzip format.
+Lzlib is written in C and is distributed under a 2-clause BSD license.
 
-The lzip file format is designed for data sharing and long-term
-archiving, taking into account both data integrity and decoder
-availability:
+The functions and variables forming the interface of the compression library
+are declared in the file 'lzlib.h'. Usage examples of the library are given
+in the files 'bbexample.c', 'ffexample.c', and 'minilzip.c' from the source
+distribution.
 
-   * The lzip format provides very safe integrity checking and some data
-     recovery means. The lziprecover program can repair bit-flip errors
-     (one of the most common forms of data corruption) in lzip files,
-     and provides data recovery capabilities, including error-checked
-     merging of damaged copies of a file.
+As 'lzlib.h' can be used in C and C++ programs, it must not impose a choice
+of system headers on the program by including one of them. Therefore it is
+the responsibility of the program using lzlib to include before 'lzlib.h'
+some header that declares the type 'uint8_t'. There are at least four such
+headers in C and C++: 'stdint.h', 'cstdint', 'inttypes.h', and 'cinttypes'.
 
-   * The lzip format is as simple as possible (but not simpler). The
-     lzip manual provides the code of a simple decompressor along with a
-     detailed explanation of how it works, so that with the only help of
-     the lzip manual it would be possible for a digital archaeologist to
-     extract the data from a lzip file long after quantum computers
-     eventually render LZMA obsolete.
-
-   * Additionally the lzip reference implementation is copylefted, which
-     guarantees that it will remain free forever.
-
-A nice feature of the lzip format is that a corrupt byte is easier to
-repair the nearer it is from the beginning of the file. Therefore, with
-the help of lziprecover, losing an entire archive just because of a
-corrupt byte near the beginning is a thing of the past.
-
-The functions and variables forming the interface of the compression
-library are declared in the file 'lzlib.h'. Usage examples of the
-library are given in the files 'main.c' and 'bbexample.c' from the
-source distribution.
+All the library functions are thread safe. The library does not install any
+signal handler. The decoder checks the consistency of the compressed data,
+so the library should never crash even in case of corrupted input.
 
 Compression/decompression is done by repeatedly calling a couple of
-read/write functions until all the data have been processed by the
-library. This interface is safer and less error prone than the
-traditional zlib interface.
+read/write functions until all the data have been processed by the library.
+This interface is safer and less error prone than the traditional zlib
+interface.
 
 Compression/decompression is done when the read function is called. This
-means the value returned by the position functions will not be updated
-until a read call, even if a lot of data is written. If you want the
-data to be compressed in advance, just call the read function with a
-size equal to 0.
+means the value returned by the position functions is not updated until a
+read call, even if a lot of data are written. If you want the data to be
+compressed in advance, just call the read function with a size equal to 0.
 
-If all the data to be compressed are written in advance, lzlib will
-automatically adjust the header of the compressed data to use the
-smallest possible dictionary size. This feature reduces the amount of
-memory needed for decompression and allows minilzip to produce identical
-compressed output as lzip.
+If all the data to be compressed are written in advance, lzlib automatically
+adjusts the header of the compressed data to use the largest dictionary size
+that does not exceed neither the data size nor the limit given to
+'LZ_compress_open'. This feature reduces the amount of memory needed for
+decompression and allows minilzip to produce identical compressed output as
+lzip.
 
-Lzlib will correctly decompress a data stream which is the concatenation
-of two or more compressed data streams. The result is the concatenation
-of the corresponding decompressed data streams. Integrity testing of
-concatenated compressed data streams is also supported.
+Lzlib correctly decompresses a data stream which is the concatenation of
+two or more compressed data streams. The result is the concatenation of the
+corresponding decompressed data streams. Integrity testing of concatenated
+compressed data streams is also supported.
 
-All the library functions are thread safe. The library does not install
-any signal handler. The decoder checks the consistency of the compressed
-data, so the library should never crash even in case of corrupted input.
+Lzlib is able to compress and decompress streams of unlimited size by
+automatically creating multimember output. The members so created are large,
+about 2 PiB each.
 
 In spite of its name (Lempel-Ziv-Markov chain-Algorithm), LZMA is not a
 concrete algorithm; it is more like "any algorithm using the LZMA coding
-scheme". For example, the option '-0' of lzip uses the scheme in almost
-the simplest way possible; issuing the longest match it can find, or a
-literal byte if it can't find a match. Inversely, a much more elaborated
-way of finding coding sequences of minimum size than the one currently
-used by lzip could be developed, and the resulting sequence could also
-be coded using the LZMA coding scheme.
+scheme". For example, the option '-0' of lzip uses the scheme in almost the
+simplest way possible; issuing the longest match it can find, or a literal
+byte if it can't find a match. Inversely, a more elaborate way of finding
+coding sequences of minimum size than the one currently used by lzip could
+be developed, and the resulting sequence could also be coded using the LZMA
+coding scheme.
 
-Lzlib currently implements two variants of the LZMA algorithm; fast
-(used by option '-0' of minilzip) and normal (used by all other
-compression levels).
+Lzlib currently implements two variants of the LZMA algorithm: fast (used by
+option '-0' of minilzip) and normal (used by all other compression levels).
 
 The high compression of LZMA comes from combining two basic, well-proven
-compression ideas: sliding dictionaries (LZ77/78) and markov models (the
-thing used by every compression algorithm that uses a range encoder or
-similar order-0 entropy coder as its last stage) with segregation of
-contexts according to what the bits are used for.
+compression ideas: sliding dictionaries (LZ77) and Markov models (the thing
+used by every compression algorithm that uses a range encoder or similar
+order-0 entropy coder as its last stage) with segregation of contexts
+according to what the bits are used for.
 
 The ideas embodied in lzlib are due to (at least) the following people:
-Abraham Lempel and Jacob Ziv (for the LZ algorithm), Andrey Markov (for
-the definition of Markov chains), G.N.N. Martin (for the definition of
-range encoding), Igor Pavlov (for putting all the above together in
-LZMA), and Julian Seward (for bzip2's CLI).
+Abraham Lempel and Jacob Ziv (for the LZ algorithm), Andrei Markov (for the
+definition of Markov chains), G.N.N. Martin (for the definition of range
+encoding), Igor Pavlov (for putting all the above together in LZMA), and
+Julian Seward (for bzip2's CLI).
+
+LANGUAGE NOTE: Uncompressed = not compressed = plain data; it may never have
+been compressed. Decompressed is used to refer to data which have undergone
+the process of decompression.
+
+minilzip uses Arg_parser for command-line argument parsing:
+http://www.nongnu.org/arg-parser/arg_parser.html
 
 
-Copyright (C) 2009-2016 Antonio Diaz Diaz.
+Copyright (C) 2009-2025 Antonio Diaz Diaz.
 
 This file is free documentation: you have unlimited permission to copy,
-distribute and modify it.
+distribute, and modify it.
 
-The file Makefile.in is a data file used by configure to produce the
-Makefile. It has the same copyright owner and permissions that configure
-itself.
+The file Makefile.in is a data file used by configure to produce the Makefile.
+It has the same copyright owner and permissions that configure itself.

bbexample.c

@@ -1,21 +1,20 @@
-/*  Buffer to buffer example - Test program for the lzlib library
-    Copyright (C) 2010-2016 Antonio Diaz Diaz.
+/* Buffer to buffer example - Test program for the library lzlib
+   Copyright (C) 2010-2025 Antonio Diaz Diaz.
 
-    This program is free software: you have unlimited permission
-    to copy, distribute and modify it.
+   This program is free software: you have unlimited permission
+   to copy, distribute, and modify it.
 
-    Usage is:
-      bbexample filename
+   Usage: bbexample filename
 
-    This program is an example of how buffer-to-buffer
-    compression/decompression can be implemented using lzlib.
+   This program is an example of how buffer-to-buffer
+   compression/decompression can be implemented using lzlib.
 */
 
+#define _FILE_OFFSET_BITS 64
+
 #include <errno.h>
 #include <limits.h>
-#ifndef __cplusplus
 #include <stdbool.h>
-#endif
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -24,70 +23,72 @@
 
 #include "lzlib.h"
 
+#ifndef min
+  #define min(x,y) ((x) <= (y) ? (x) : (y))
+#endif
 
-/* Returns the address of a malloc'd buffer containing the file data and
-   its size in '*size'.
-   In case of error, returns 0 and does not modify '*size'.
+
+/* Return the address of a malloc'd buffer containing the file data and
+   the file size in '*file_sizep'.
+   In case of error, return 0 and do not modify '*file_sizep'.
 */
-uint8_t * read_file( const char * const name, long * const size )
+uint8_t * read_file( const char * const name, long * const file_sizep )
   {
   long buffer_size = 1 << 20, file_size;
   uint8_t * buffer, * tmp;
   FILE * const f = fopen( name, "rb" );
   if( !f )
-    {
-    fprintf( stderr, "bbexample: Can't open input file '%s': %s\n",
-             name, strerror( errno ) );
-    return 0;
-    }
+    { fprintf( stderr, "bbexample: %s: Can't open input file: %s\n",
+               name, strerror( errno ) ); return 0; }
 
   buffer = (uint8_t *)malloc( buffer_size );
   if( !buffer )
-    { fputs( "bbexample: Not enough memory.\n", stderr ); return 0; }
+    { fputs( "bbexample: read_file: Not enough memory.\n", stderr );
+      fclose( f ); return 0; }
   file_size = fread( buffer, 1, buffer_size, f );
   while( file_size >= buffer_size )
     {
     if( buffer_size >= LONG_MAX )
       {
-      fprintf( stderr, "bbexample: Input file '%s' is too large.\n", name );
-      free( buffer ); return 0;
+      fprintf( stderr, "bbexample: %s: Input file is too large.\n", name );
+      free( buffer ); fclose( f ); return 0;
       }
-    buffer_size = ( buffer_size <= LONG_MAX / 2 ) ? 2 * buffer_size : LONG_MAX;
+    buffer_size = (buffer_size <= LONG_MAX / 2) ? 2 * buffer_size : LONG_MAX;
     tmp = (uint8_t *)realloc( buffer, buffer_size );
     if( !tmp )
-      { fputs( "bbexample: Not enough memory.\n", stderr );
-        free( buffer ); return 0; }
+      { fputs( "bbexample: read_file: Not enough memory.\n", stderr );
+        free( buffer ); fclose( f ); return 0; }
     buffer = tmp;
     file_size += fread( buffer + file_size, 1, buffer_size - file_size, f );
     }
   if( ferror( f ) || !feof( f ) )
     {
-    fprintf( stderr, "bbexample: Error reading file '%s': %s\n",
+    fprintf( stderr, "bbexample: %s: Error reading file: %s\n",
              name, strerror( errno ) );
-    free( buffer ); return 0;
+    free( buffer ); fclose( f ); return 0;
     }
   fclose( f );
-  *size = file_size;
+  *file_sizep = file_size;
   return buffer;
   }
 
 
-/* Compresses 'size' bytes from 'data'. Returns the address of a
-   malloc'd buffer containing the compressed data and its size in
-   '*out_sizep'.
-   In case of error, returns 0 and does not modify '*out_sizep'.
+/* Compress 'insize' bytes from 'inbuf'.
+   Return the address of a malloc'd buffer containing the compressed data,
+   and the size of the data in '*outlenp'.
+   In case of error, return 0 and do not modify '*outlenp'.
 */
-uint8_t * bbcompress( const uint8_t * const data, const long size,
-                      const int level, long * const out_sizep )
+uint8_t * bbcompressl( const uint8_t * const inbuf, const long insize,
+                       const int level, long * const outlenp )
   {
-  struct Lzma_options
+  typedef struct Lzma_options
     {
     int dictionary_size;		/* 4 KiB .. 512 MiB */
     int match_len_limit;		/* 5 .. 273 */
-    };
-  /* Mapping from gzip/bzip2 style 1..9 compression modes
-     to the corresponding LZMA compression modes. */
-  const struct Lzma_options option_mapping[] =
+    } Lzma_options;
+  /* Mapping from gzip/bzip2 style 0..9 compression levels to the
+     corresponding LZMA compression parameters. */
+  const Lzma_options option_mapping[] =
     {
     {   65535,  16 },		/* -0 (65535,16 chooses fast encoder) */
     { 1 << 20,   5 },		/* -1 */
@@ -99,133 +100,247 @@ uint8_t * bbcompress( const uint8_t * const data, const long size,
     { 1 << 24,  68 },		/* -7 */
     { 3 << 23, 132 },		/* -8 */
     { 1 << 25, 273 } };		/* -9 */
-  struct Lzma_options encoder_options;
-  const unsigned long long member_size = 0x7FFFFFFFFFFFFFFFULL;	/* INT64_MAX */
-  struct LZ_Encoder * encoder;
-  uint8_t * new_data;
-  const long delta_size = ( size / 4 ) + 64;	/* size may be zero */
-  long new_data_size = delta_size;		/* initial size */
-  long new_pos = 0;
-  long written = 0;
+  Lzma_options encoder_options;
+  LZ_Encoder * encoder;
+  uint8_t * outbuf;
+  const long delta_size = insize / 4 + 64;	/* insize may be zero */
+  long outsize = delta_size;			/* initial outsize */
+  long inpos = 0;
+  long outpos = 0;
   bool error = false;
 
   if( level < 0 || level > 9 ) return 0;
   encoder_options = option_mapping[level];
 
-  if( encoder_options.dictionary_size > size && level != 0 )
-    encoder_options.dictionary_size = size;		/* saves memory */
+  if( encoder_options.dictionary_size > insize && level != 0 )
+    encoder_options.dictionary_size = insize;		/* saves memory */
   if( encoder_options.dictionary_size < LZ_min_dictionary_size() )
     encoder_options.dictionary_size = LZ_min_dictionary_size();
   encoder = LZ_compress_open( encoder_options.dictionary_size,
-                              encoder_options.match_len_limit, member_size );
-  if( !encoder || LZ_compress_errno( encoder ) != LZ_ok )
-    { LZ_compress_close( encoder ); return 0; }
-
-  new_data = (uint8_t *)malloc( new_data_size );
-  if( !new_data )
-    { LZ_compress_close( encoder ); return 0; }
+                              encoder_options.match_len_limit, INT64_MAX );
+  outbuf = (uint8_t *)malloc( outsize );
+  if( !encoder || LZ_compress_errno( encoder ) != LZ_ok || !outbuf )
+    { free( outbuf ); LZ_compress_close( encoder ); return 0; }
 
   while( true )
     {
-    int rd;
-    if( LZ_compress_write_size( encoder ) > 0 )
-      {
-      if( written < size )
-        {
-        const int wr = LZ_compress_write( encoder, data + written,
-                                          size - written );
-        if( wr < 0 ) { error = true; break; }
-        written += wr;
-        }
-      if( written >= size ) LZ_compress_finish( encoder );
-      }
-    rd = LZ_compress_read( encoder, new_data + new_pos,
-                           new_data_size - new_pos );
-    if( rd < 0 ) { error = true; break; }
-    new_pos += rd;
+    int ret = LZ_compress_write( encoder, inbuf + inpos,
+                                 min( INT_MAX, insize - inpos ) );
+    if( ret < 0 ) { error = true; break; }
+    inpos += ret;
+    if( inpos >= insize ) LZ_compress_finish( encoder );
+    ret = LZ_compress_read( encoder, outbuf + outpos,
+                            min( INT_MAX, outsize - outpos ) );
+    if( ret < 0 ) { error = true; break; }
+    outpos += ret;
     if( LZ_compress_finished( encoder ) == 1 ) break;
-    if( new_pos >= new_data_size )
+    if( outpos >= outsize )
       {
       uint8_t * tmp;
-      if( new_data_size > LONG_MAX - delta_size ) { error = true; break; }
-      new_data_size += delta_size;
-      tmp = (uint8_t *)realloc( new_data, new_data_size );
+      if( outsize > LONG_MAX - delta_size ) { error = true; break; }
+      outsize += delta_size;
+      tmp = (uint8_t *)realloc( outbuf, outsize );
       if( !tmp ) { error = true; break; }
-      new_data = tmp;
+      outbuf = tmp;
       }
     }
 
   if( LZ_compress_close( encoder ) < 0 ) error = true;
-  if( error ) { free( new_data ); return 0; }
-  *out_sizep = new_pos;
-  return new_data;
+  if( error ) { free( outbuf ); return 0; }
+  *outlenp = outpos;
+  return outbuf;
   }
 
 
-/* Decompresses 'size' bytes from 'data'. Returns the address of a
-   malloc'd buffer containing the decompressed data and its size in
-   '*out_sizep'.
-   In case of error, returns 0 and does not modify '*out_sizep'.
+/* Decompress 'insize' bytes from 'inbuf'.
+   Return the address of a malloc'd buffer containing the decompressed
+   data, and the size of the data in '*outlenp'.
+   In case of error, return 0 and do not modify '*outlenp'.
 */
-uint8_t * bbdecompress( const uint8_t * const data, const long size,
-                        long * const out_sizep )
+uint8_t * bbdecompressl( const uint8_t * const inbuf, const long insize,
+                         long * const outlenp )
   {
-  struct LZ_Decoder * const decoder = LZ_decompress_open();
-  uint8_t * new_data;
-  const long delta_size = size;			/* size must be > zero */
-  long new_data_size = delta_size;		/* initial size */
-  long new_pos = 0;
-  long written = 0;
+  LZ_Decoder * const decoder = LZ_decompress_open();
+  const long delta_size = insize;		/* insize must be > zero */
+  long outsize = delta_size;			/* initial outsize */
+  uint8_t * outbuf = (uint8_t *)malloc( outsize );
+  long inpos = 0;
+  long outpos = 0;
   bool error = false;
-  if( !decoder || LZ_decompress_errno( decoder ) != LZ_ok )
-    { LZ_decompress_close( decoder ); return 0; }
-
-  new_data = (uint8_t *)malloc( new_data_size );
-  if( !new_data )
-    { LZ_decompress_close( decoder ); return 0; }
+  if( !decoder || LZ_decompress_errno( decoder ) != LZ_ok || !outbuf )
+    { free( outbuf ); LZ_decompress_close( decoder ); return 0; }
 
   while( true )
     {
-    int rd;
-    if( LZ_decompress_write_size( decoder ) > 0 )
-      {
-      if( written < size )
-        {
-        const int wr = LZ_decompress_write( decoder, data + written,
-                                            size - written );
-        if( wr < 0 ) { error = true; break; }
-        written += wr;
-        }
-      if( written >= size ) LZ_decompress_finish( decoder );
-      }
-    rd = LZ_decompress_read( decoder, new_data + new_pos,
-                             new_data_size - new_pos );
-    if( rd < 0 ) { error = true; break; }
-    new_pos += rd;
+    int ret = LZ_decompress_write( decoder, inbuf + inpos,
+                                   min( INT_MAX, insize - inpos ) );
+    if( ret < 0 ) { error = true; break; }
+    inpos += ret;
+    if( inpos >= insize ) LZ_decompress_finish( decoder );
+    ret = LZ_decompress_read( decoder, outbuf + outpos,
+                              min( INT_MAX, outsize - outpos ) );
+    if( ret < 0 ) { error = true; break; }
+    outpos += ret;
     if( LZ_decompress_finished( decoder ) == 1 ) break;
-    if( new_pos >= new_data_size )
+    if( outpos >= outsize )
       {
       uint8_t * tmp;
-      if( new_data_size > LONG_MAX - delta_size ) { error = true; break; }
-      new_data_size += delta_size;
-      tmp = (uint8_t *)realloc( new_data, new_data_size );
+      if( outsize > LONG_MAX - delta_size ) { error = true; break; }
+      outsize += delta_size;
+      tmp = (uint8_t *)realloc( outbuf, outsize );
       if( !tmp ) { error = true; break; }
-      new_data = tmp;
+      outbuf = tmp;
       }
     }
 
   if( LZ_decompress_close( decoder ) < 0 ) error = true;
-  if( error ) { free( new_data ); return 0; }
-  *out_sizep = new_pos;
-  return new_data;
+  if( error ) { free( outbuf ); return 0; }
+  *outlenp = outpos;
+  return outbuf;
+  }
+
+
+/* Test the whole file at all levels. */
+int full_test( const uint8_t * const inbuf, const long insize )
+  {
+  int level;
+  for( level = 0; level <= 9; ++level )
+    {
+    long midsize = 0, outsize = 0;
+    uint8_t * outbuf;
+    uint8_t * midbuf = bbcompressl( inbuf, insize, level, &midsize );
+    if( !midbuf )
+      { fputs( "bbexample: full_test: Not enough memory or compress error.\n",
+               stderr ); return 1; }
+
+    outbuf = bbdecompressl( midbuf, midsize, &outsize );
+    free( midbuf );
+    if( !outbuf )
+      { fputs( "bbexample: full_test: Not enough memory or decompress error.\n",
+               stderr ); return 1; }
+
+    if( insize != outsize ||
+        ( insize > 0 && memcmp( inbuf, outbuf, insize ) != 0 ) )
+      { fputs( "bbexample: full_test: Decompressed data differs from original.\n",
+               stderr ); free( outbuf ); return 1; }
+
+    free( outbuf );
+    }
+  return 0;
+  }
+
+
+/* Compress 'insize' bytes from 'inbuf' to 'outbuf'.
+   Return the size of the compressed data in '*outlenp'.
+   In case of error, or if 'outsize' is too small, return false and do not
+   modify '*outlenp'.
+*/
+bool bbcompress( const uint8_t * const inbuf, const int insize,
+                 const int dictionary_size, const int match_len_limit,
+                 uint8_t * const outbuf, const int outsize,
+                 int * const outlenp )
+  {
+  int inpos = 0, outpos = 0;
+  bool error = false;
+  LZ_Encoder * const encoder =
+    LZ_compress_open( dictionary_size, match_len_limit, INT64_MAX );
+  if( !encoder || LZ_compress_errno( encoder ) != LZ_ok )
+    { LZ_compress_close( encoder ); return false; }
+
+  while( true )
+    {
+    int ret = LZ_compress_write( encoder, inbuf + inpos, insize - inpos );
+    if( ret < 0 ) { error = true; break; }
+    inpos += ret;
+    if( inpos >= insize ) LZ_compress_finish( encoder );
+    ret = LZ_compress_read( encoder, outbuf + outpos, outsize - outpos );
+    if( ret < 0 ) { error = true; break; }
+    outpos += ret;
+    if( LZ_compress_finished( encoder ) == 1 ) break;
+    if( outpos >= outsize ) { error = true; break; }
+    }
+
+  if( LZ_compress_close( encoder ) < 0 ) error = true;
+  if( error ) return false;
+  *outlenp = outpos;
+  return true;
+  }
+
+
+/* Decompress 'insize' bytes from 'inbuf' to 'outbuf'.
+   Return the size of the decompressed data in '*outlenp'.
+   In case of error, or if 'outsize' is too small, return false and do not
+   modify '*outlenp'.
+*/
+bool bbdecompress( const uint8_t * const inbuf, const int insize,
+                   uint8_t * const outbuf, const int outsize,
+                   int * const outlenp )
+  {
+  int inpos = 0, outpos = 0;
+  bool error = false;
+  LZ_Decoder * const decoder = LZ_decompress_open();
+  if( !decoder || LZ_decompress_errno( decoder ) != LZ_ok )
+    { LZ_decompress_close( decoder ); return false; }
+
+  while( true )
+    {
+    int ret = LZ_decompress_write( decoder, inbuf + inpos, insize - inpos );
+    if( ret < 0 ) { error = true; break; }
+    inpos += ret;
+    if( inpos >= insize ) LZ_decompress_finish( decoder );
+    ret = LZ_decompress_read( decoder, outbuf + outpos, outsize - outpos );
+    if( ret < 0 ) { error = true; break; }
+    outpos += ret;
+    if( LZ_decompress_finished( decoder ) == 1 ) break;
+    if( outpos >= outsize ) { error = true; break; }
+    }
+
+  if( LZ_decompress_close( decoder ) < 0 ) error = true;
+  if( error ) return false;
+  *outlenp = outpos;
+  return true;
+  }
+
+
+/* Test at most INT_MAX bytes from the file with buffers of fixed size. */
+int fixed_test( const uint8_t * const inbuf, const int insize )
+  {
+  int dictionary_size = 65535;		/* fast encoder */
+  int midsize = min( INT_MAX, ( insize / 8 ) * 9LL + 44 ), outsize = insize;
+  uint8_t * midbuf = (uint8_t *)malloc( midsize );
+  uint8_t * outbuf = (uint8_t *)malloc( outsize );
+  if( !midbuf || !outbuf )
+    { fputs( "bbexample: fixed_test: Not enough memory.\n", stderr );
+      free( outbuf ); free( midbuf ); return 1; }
+
+  for( ; dictionary_size <= 8 << 20; dictionary_size += 8323073 )
+    {
+    int midlen, outlen;
+    if( !bbcompress( inbuf, insize, dictionary_size, 16, midbuf, midsize, &midlen ) )
+      { fputs( "bbexample: fixed_test: Not enough memory or compress error.\n",
+               stderr ); free( outbuf ); free( midbuf ); return 1; }
+
+    if( !bbdecompress( midbuf, midlen, outbuf, outsize, &outlen ) )
+      { fputs( "bbexample: fixed_test: Not enough memory or decompress error.\n",
+               stderr ); free( outbuf ); free( midbuf ); return 1; }
+
+    if( insize != outlen ||
+        ( insize > 0 && memcmp( inbuf, outbuf, insize ) != 0 ) )
+      { fputs( "bbexample: fixed_test: Decompressed data differs from original.\n",
+               stderr ); free( outbuf ); free( midbuf ); return 1; }
+
+    }
+  free( outbuf );
+  free( midbuf );
+  return 0;
   }
 
 
 int main( const int argc, const char * const argv[] )
   {
-  uint8_t * in_buffer;
-  long in_size = 0;
-  int level;
+  int retval = 0, i;
+  int open_failures = 0;
+  const bool verbose = argc > 2;
 
   if( argc < 2 )
     {
@@ -233,38 +348,20 @@ int main( const int argc, const char * const argv[] )
     return 1;
     }
 
-  in_buffer = read_file( argv[1], &in_size );
-  if( !in_buffer ) return 1;
-
-  for( level = 0; level <= 9; ++level )
+  for( i = 1; i < argc && retval == 0; ++i )
     {
-    uint8_t * mid_buffer, * out_buffer;
-    long mid_size = 0, out_size = 0;
+    long insize;
+    uint8_t * const inbuf = read_file( argv[i], &insize );
+    if( !inbuf ) { ++open_failures; continue; }
+    if( verbose ) fprintf( stderr, "  Testing file '%s'\n", argv[i] );
 
-    mid_buffer = bbcompress( in_buffer, in_size, level, &mid_size );
-    if( !mid_buffer )
-      {
-      fputs( "bbexample: Not enough memory or compress error.\n", stderr );
-      return 1;
-      }
-
-    out_buffer = bbdecompress( mid_buffer, mid_size, &out_size );
-    if( !out_buffer )
-      {
-      fputs( "bbexample: Not enough memory or decompress error.\n", stderr );
-      return 1;
-      }
-
-    if( in_size != out_size ||
-        ( in_size > 0 && memcmp( in_buffer, out_buffer, in_size ) != 0 ) )
-      {
-      fputs( "bbexample: Decompressed data differs from original.\n", stderr );
-      return 1;
-      }
-
-    free( out_buffer );
-    free( mid_buffer );
+    retval = full_test( inbuf, insize );
+    if( retval == 0 ) retval = fixed_test( inbuf, min( INT_MAX, insize ) );
+    free( inbuf );
     }
-  free( in_buffer );
-  return 0;
+  if( open_failures > 0 && verbose )
+    fprintf( stderr, "bbexample: warning: %d %s failed to open.\n",
+             open_failures, ( open_failures == 1 ) ? "file" : "files" );
+  if( retval == 0 && open_failures ) retval = 1;
+  return retval;
   }

carg_parser.c

@@ -1,20 +1,20 @@
-/*  Arg_parser - POSIX/GNU command line argument parser. (C version)
-    Copyright (C) 2006-2016 Antonio Diaz Diaz.
+/* Arg_parser - POSIX/GNU command-line argument parser. (C version)
+   Copyright (C) 2006-2025 Antonio Diaz Diaz.
 
-    This library is free software. Redistribution and use in source and
-    binary forms, with or without modification, are permitted provided
-    that the following conditions are met:
+   This library is free software. Redistribution and use in source and
+   binary forms, with or without modification, are permitted provided
+   that the following conditions are met:
 
-    1. Redistributions of source code must retain the above copyright
-    notice, this list of conditions and the following disclaimer.
+   1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions, and the following disclaimer.
 
-    2. Redistributions in binary form must reproduce the above copyright
-    notice, this list of conditions and the following disclaimer in the
-    documentation and/or other materials provided with the distribution.
+   2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions, and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
 
-    This library is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 */
 
 #include <stdlib.h>
@@ -32,28 +32,46 @@ static void * ap_resize_buffer( void * buf, const int min_size )
   }
 
 
-static char push_back_record( struct Arg_parser * const ap,
-                              const int code, const char * const argument )
+static char push_back_record( Arg_parser * const ap, const int code,
+                              const char * const long_name,
+                              const char * const argument )
   {
-  const int len = strlen( argument );
-  struct ap_Record * p;
+  ap_Record * p;
   void * tmp = ap_resize_buffer( ap->data,
-                 ( ap->data_size + 1 ) * sizeof (struct ap_Record) );
+                                 ( ap->data_size + 1 ) * sizeof (ap_Record) );
   if( !tmp ) return 0;
-  ap->data = (struct ap_Record *)tmp;
+  ap->data = (ap_Record *)tmp;
   p = &(ap->data[ap->data_size]);
   p->code = code;
-  p->argument = 0;
-  tmp = ap_resize_buffer( p->argument, len + 1 );
-  if( !tmp ) return 0;
-  p->argument = (char *)tmp;
-  strncpy( p->argument, argument, len + 1 );
+  if( long_name )
+    {
+    const int len = strlen( long_name );
+    p->parsed_name = (char *)malloc( len + 2 + 1 );
+    if( !p->parsed_name ) return 0;
+    p->parsed_name[0] = p->parsed_name[1] = '-';
+    strncpy( p->parsed_name + 2, long_name, len + 1 );
+    }
+  else if( code > 0 && code < 256 )
+    {
+    p->parsed_name = (char *)malloc( 2 + 1 );
+    if( !p->parsed_name ) return 0;
+    p->parsed_name[0] = '-'; p->parsed_name[1] = code; p->parsed_name[2] = 0;
+    }
+  else p->parsed_name = 0;
+  if( argument )
+    {
+    const int len = strlen( argument );
+    p->argument = (char *)malloc( len + 1 );
+    if( !p->argument ) { free( p->parsed_name ); return 0; }
+    strncpy( p->argument, argument, len + 1 );
+    }
+  else p->argument = 0;
   ++ap->data_size;
   return 1;
   }
 
 
-static char add_error( struct Arg_parser * const ap, const char * const msg )
+static char add_error( Arg_parser * const ap, const char * const msg )
   {
   const int len = strlen( msg );
   void * tmp = ap_resize_buffer( ap->error, ap->error_size + len + 1 );
@@ -65,19 +83,20 @@ static char add_error( struct Arg_parser * const ap, const char * const msg )
   }
 
 
-static void free_data( struct Arg_parser * const ap )
+static void free_data( Arg_parser * const ap )
   {
   int i;
-  for( i = 0; i < ap->data_size; ++i ) free( ap->data[i].argument );
+  for( i = 0; i < ap->data_size; ++i )
+    { free( ap->data[i].argument ); free( ap->data[i].parsed_name ); }
   if( ap->data ) { free( ap->data ); ap->data = 0; }
   ap->data_size = 0;
   }
 
 
-static char parse_long_option( struct Arg_parser * const ap,
+/* Return 0 only if out of memory. */
+static char parse_long_option( Arg_parser * const ap,
                                const char * const opt, const char * const arg,
-                               const struct ap_Option options[],
-                               int * const argindp )
+                               const ap_Option options[], int * const argindp )
   {
   unsigned len;
   int index = -1, i;
@@ -87,14 +106,15 @@ static char parse_long_option( struct Arg_parser * const ap,
 
   /* Test all long options for either exact match or abbreviated matches. */
   for( i = 0; options[i].code != 0; ++i )
-    if( options[i].name && strncmp( options[i].name, &opt[2], len ) == 0 )
+    if( options[i].long_name &&
+        strncmp( options[i].long_name, &opt[2], len ) == 0 )
       {
-      if( strlen( options[i].name ) == len )	/* Exact match found */
+      if( strlen( options[i].long_name ) == len )	/* Exact match found */
         { index = i; exact = 1; break; }
       else if( index < 0 ) index = i;		/* First nonexact match found */
       else if( options[index].code != options[i].code ||
                options[index].has_arg != options[i].has_arg )
-        ambig = 1;			/* Second or later nonexact match found */
+        ambig = 1;		/* Second or later nonexact match found */
       }
 
   if( ambig && !exact )
@@ -117,52 +137,55 @@ static char parse_long_option( struct Arg_parser * const ap,
     {
     if( options[index].has_arg == ap_no )
       {
-      add_error( ap, "option '--" ); add_error( ap, options[index].name );
+      add_error( ap, "option '--" ); add_error( ap, options[index].long_name );
       add_error( ap, "' doesn't allow an argument" );
       return 1;
       }
     if( options[index].has_arg == ap_yes && !opt[len+3] )
       {
-      add_error( ap, "option '--" ); add_error( ap, options[index].name );
+      add_error( ap, "option '--" ); add_error( ap, options[index].long_name );
       add_error( ap, "' requires an argument" );
       return 1;
       }
-    return push_back_record( ap, options[index].code, &opt[len+3] );
+    return push_back_record( ap, options[index].code, options[index].long_name,
+                             &opt[len+3] );	/* argument may be empty */
     }
 
-  if( options[index].has_arg == ap_yes )
+  if( options[index].has_arg == ap_yes || options[index].has_arg == ap_yme )
     {
-    if( !arg || !arg[0] )
+    if( !arg || ( options[index].has_arg == ap_yes && !arg[0] ) )
       {
-      add_error( ap, "option '--" ); add_error( ap, options[index].name );
+      add_error( ap, "option '--" ); add_error( ap, options[index].long_name );
       add_error( ap, "' requires an argument" );
       return 1;
       }
     ++*argindp;
-    return push_back_record( ap, options[index].code, arg );
+    return push_back_record( ap, options[index].code, options[index].long_name,
+                             arg );	/* argument may be empty */
     }
 
-  return push_back_record( ap, options[index].code, "" );
+  return push_back_record( ap, options[index].code,
+                           options[index].long_name, 0 );
   }
 
 
-static char parse_short_option( struct Arg_parser * const ap,
+/* Return 0 only if out of memory. */
+static char parse_short_option( Arg_parser * const ap,
                                 const char * const opt, const char * const arg,
-                                const struct ap_Option options[],
-                                int * const argindp )
+                                const ap_Option options[], int * const argindp )
   {
   int cind = 1;			/* character index in opt */
 
   while( cind > 0 )
     {
     int index = -1, i;
-    const unsigned char code = opt[cind];
+    const unsigned char c = opt[cind];
     char code_str[2];
-    code_str[0] = code; code_str[1] = 0;
+    code_str[0] = c; code_str[1] = 0;
 
-    if( code != 0 )
+    if( c != 0 )
       for( i = 0; options[i].code; ++i )
-        if( code == options[i].code )
+        if( c == options[i].code )
           { index = i; break; }
 
     if( index < 0 )
@@ -176,34 +199,34 @@ static char parse_short_option( struct Arg_parser * const ap,
 
     if( options[index].has_arg != ap_no && cind > 0 && opt[cind] )
       {
-      if( !push_back_record( ap, code, &opt[cind] ) ) return 0;
+      if( !push_back_record( ap, c, 0, &opt[cind] ) ) return 0;
       ++*argindp; cind = 0;
       }
-    else if( options[index].has_arg == ap_yes )
+    else if( options[index].has_arg == ap_yes || options[index].has_arg == ap_yme )
       {
-      if( !arg || !arg[0] )
+      if( !arg || ( options[index].has_arg == ap_yes && !arg[0] ) )
         {
         add_error( ap, "option requires an argument -- '" );
         add_error( ap, code_str ); add_error( ap, "'" );
         return 1;
         }
-      ++*argindp; cind = 0;
-      if( !push_back_record( ap, code, arg ) ) return 0;
+      ++*argindp; cind = 0;		/* argument may be empty */
+      if( !push_back_record( ap, c, 0, arg ) ) return 0;
       }
-    else if( !push_back_record( ap, code, "" ) ) return 0;
+    else if( !push_back_record( ap, c, 0, 0 ) ) return 0;
     }
   return 1;
   }
 
 
-char ap_init( struct Arg_parser * const ap,
+char ap_init( Arg_parser * const ap,
               const int argc, const char * const argv[],
-              const struct ap_Option options[], const char in_order )
+              const ap_Option options[], const char in_order )
   {
   const char ** non_options = 0;	/* skipped non-options */
   int non_options_size = 0;		/* number of skipped non-options */
   int argind = 1;			/* index in argv */
-  int i;
+  char done = 0;			/* false until success */
 
   ap->data = 0;
   ap->error = 0;
@@ -223,38 +246,41 @@ char ap_init( struct Arg_parser * const ap,
       if( ch2 == '-' )
         {
         if( !argv[argind][2] ) { ++argind; break; }	/* we found "--" */
-        else if( !parse_long_option( ap, opt, arg, options, &argind ) ) return 0;
+        else if( !parse_long_option( ap, opt, arg, options, &argind ) ) goto out;
         }
-      else if( !parse_short_option( ap, opt, arg, options, &argind ) ) return 0;
+      else if( !parse_short_option( ap, opt, arg, options, &argind ) ) goto out;
       if( ap->error ) break;
       }
     else
       {
-      if( !in_order )
+      if( in_order )
+        { if( !push_back_record( ap, 0, 0, argv[argind++] ) ) goto out; }
+      else
         {
         void * tmp = ap_resize_buffer( non_options,
                        ( non_options_size + 1 ) * sizeof *non_options );
-        if( !tmp ) return 0;
+        if( !tmp ) goto out;
         non_options = (const char **)tmp;
         non_options[non_options_size++] = argv[argind++];
         }
-      else if( !push_back_record( ap, 0, argv[argind++] ) ) return 0;
       }
     }
   if( ap->error ) free_data( ap );
   else
     {
+    int i;
     for( i = 0; i < non_options_size; ++i )
-      if( !push_back_record( ap, 0, non_options[i] ) ) return 0;
+      if( !push_back_record( ap, 0, 0, non_options[i] ) ) goto out;
     while( argind < argc )
-      if( !push_back_record( ap, 0, argv[argind++] ) ) return 0;
+      if( !push_back_record( ap, 0, 0, argv[argind++] ) ) goto out;
     }
-  if( non_options ) free( non_options );
-  return 1;
+  done = 1;
+out: if( non_options ) free( non_options );
+  return done;
   }
 
 
-void ap_free( struct Arg_parser * const ap )
+void ap_free( Arg_parser * const ap )
   {
   free_data( ap );
   if( ap->error ) { free( ap->error ); ap->error = 0; }
@@ -262,23 +288,26 @@ void ap_free( struct Arg_parser * const ap )
   }
 
 
-const char * ap_error( const struct Arg_parser * const ap )
-  { return ap->error; }
+const char * ap_error( const Arg_parser * const ap ) { return ap->error; }
 
+int ap_arguments( const Arg_parser * const ap ) { return ap->data_size; }
 
-int ap_arguments( const struct Arg_parser * const ap )
-  { return ap->data_size; }
-
-
-int ap_code( const struct Arg_parser * const ap, const int i )
+int ap_code( const Arg_parser * const ap, const int i )
   {
-  if( i >= 0 && i < ap_arguments( ap ) ) return ap->data[i].code;
-  else return 0;
+  if( i < 0 || i >= ap_arguments( ap ) ) return 0;
+  return ap->data[i].code;
   }
 
 
-const char * ap_argument( const struct Arg_parser * const ap, const int i )
+const char * ap_parsed_name( const Arg_parser * const ap, const int i )
   {
-  if( i >= 0 && i < ap_arguments( ap ) ) return ap->data[i].argument;
-  else return "";
+  if( i < 0 || i >= ap_arguments( ap ) || !ap->data[i].parsed_name ) return "";
+  return ap->data[i].parsed_name;
+  }
+
+
+const char * ap_argument( const Arg_parser * const ap, const int i )
+  {
+  if( i < 0 || i >= ap_arguments( ap ) || !ap->data[i].argument ) return "";
+  return ap->data[i].argument;
   }

carg_parser.h

@@ -1,92 +1,101 @@
-/*  Arg_parser - POSIX/GNU command line argument parser. (C version)
-    Copyright (C) 2006-2016 Antonio Diaz Diaz.
+/* Arg_parser - POSIX/GNU command-line argument parser. (C version)
+   Copyright (C) 2006-2025 Antonio Diaz Diaz.
 
-    This library is free software. Redistribution and use in source and
-    binary forms, with or without modification, are permitted provided
-    that the following conditions are met:
+   This library is free software. Redistribution and use in source and
+   binary forms, with or without modification, are permitted provided
+   that the following conditions are met:
 
-    1. Redistributions of source code must retain the above copyright
-    notice, this list of conditions and the following disclaimer.
+   1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions, and the following disclaimer.
 
-    2. Redistributions in binary form must reproduce the above copyright
-    notice, this list of conditions and the following disclaimer in the
-    documentation and/or other materials provided with the distribution.
+   2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions, and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
 
-    This library is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 */
 
-/*  Arg_parser reads the arguments in 'argv' and creates a number of
-    option codes, option arguments and non-option arguments.
+/* Arg_parser reads the arguments in 'argv' and creates a number of
+   option codes, option arguments, and non-option arguments.
 
-    In case of error, 'ap_error' returns a non-null pointer to an error
-    message.
+   In case of error, 'ap_error' returns a non-null pointer to an error
+   message.
 
-    'options' is an array of 'struct ap_Option' terminated by an element
-    containing a code which is zero. A null name means a short-only
-    option. A code value outside the unsigned char range means a
-    long-only option.
+   'options' is an array of 'struct ap_Option' terminated by an element
+   containing a code which is zero. A null long_name means a short-only
+   option. A code value outside the unsigned char range means a long-only
+   option.
 
-    Arg_parser normally makes it appear as if all the option arguments
-    were specified before all the non-option arguments for the purposes
-    of parsing, even if the user of your program intermixed option and
-    non-option arguments. If you want the arguments in the exact order
-    the user typed them, call 'ap_init' with 'in_order' = true.
+   Arg_parser normally makes it appear as if all the option arguments
+   were specified before all the non-option arguments for the purposes
+   of parsing, even if the user of your program intermixed option and
+   non-option arguments. If you want the arguments in the exact order
+   the user typed them, call 'ap_init' with 'in_order' = true.
 
-    The argument '--' terminates all options; any following arguments are
-    treated as non-option arguments, even if they begin with a hyphen.
+   The argument '--' terminates all options; any following arguments are
+   treated as non-option arguments, even if they begin with a hyphen.
 
-    The syntax for optional option arguments is '-<short_option><argument>'
-    (without whitespace), or '--<long_option>=<argument>'.
+   The syntax of options with an optional argument is
+   '-<short_option><argument>' (without whitespace), or
+   '--<long_option>=<argument>'.
+
+   The syntax of options with an empty argument is '-<short_option> ""',
+   '--<long_option> ""', or '--<long_option>=""'.
 */
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-enum ap_Has_arg { ap_no, ap_yes, ap_maybe };
+/* ap_yme = yes but maybe empty */
+typedef enum ap_Has_arg { ap_no, ap_yes, ap_maybe, ap_yme } ap_Has_arg;
 
-struct ap_Option
+typedef struct ap_Option
   {
   int code;			/* Short option letter or code ( code != 0 ) */
-  const char * name;		/* Long option name (maybe null) */
-  enum ap_Has_arg has_arg;
-  };
+  const char * long_name;	/* Long option name (maybe null) */
+  ap_Has_arg has_arg;
+  } ap_Option;
 
 
-struct ap_Record
+typedef struct ap_Record
   {
   int code;
+  char * parsed_name;
   char * argument;
-  };
+  } ap_Record;
 
 
-struct Arg_parser
+typedef struct Arg_parser
   {
-  struct ap_Record * data;
+  ap_Record * data;
   char * error;
   int data_size;
   int error_size;
-  };
+  } Arg_parser;
 
 
-char ap_init( struct Arg_parser * const ap,
+char ap_init( Arg_parser * const ap,
               const int argc, const char * const argv[],
-              const struct ap_Option options[], const char in_order );
+              const ap_Option options[], const char in_order );
 
-void ap_free( struct Arg_parser * const ap );
+void ap_free( Arg_parser * const ap );
 
-const char * ap_error( const struct Arg_parser * const ap );
+const char * ap_error( const Arg_parser * const ap );
 
-    /* The number of arguments parsed (may be different from argc) */
-int ap_arguments( const struct Arg_parser * const ap );
+/* The number of arguments parsed. May be different from argc. */
+int ap_arguments( const Arg_parser * const ap );
 
-    /* If ap_code( i ) is 0, ap_argument( i ) is a non-option.
-       Else ap_argument( i ) is the option's argument (or empty). */
-int ap_code( const struct Arg_parser * const ap, const int i );
+/* If ap_code( i ) is 0, ap_argument( i ) is a non-option.
+   Else ap_argument( i ) is the option's argument (or empty). */
+int ap_code( const Arg_parser * const ap, const int i );
 
-const char * ap_argument( const struct Arg_parser * const ap, const int i );
+/* Full name of the option parsed (short or long). */
+const char * ap_parsed_name( const Arg_parser * const ap, const int i );
+
+const char * ap_argument( const Arg_parser * const ap, const int i );
 
 #ifdef __cplusplus
 }

cbuffer.c

@@ -1,42 +1,31 @@
-/*  Lzlib - Compression library for the lzip format
-    Copyright (C) 2009-2016 Antonio Diaz Diaz.
+/* Lzlib - Compression library for the lzip format
+   Copyright (C) 2009-2025 Antonio Diaz Diaz.
 
-    This library is free software: you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation, either version 2 of the License, or
-    (at your option) any later version.
+   This library is free software. Redistribution and use in source and
+   binary forms, with or without modification, are permitted provided
+   that the following conditions are met:
 
-    This library is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
+   1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions, and the following disclaimer.
 
-    You should have received a copy of the GNU General Public License
-    along with this library.  If not, see <http://www.gnu.org/licenses/>.
+   2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions, and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
 
-    As a special exception, you may use this file as part of a free
-    software library without restriction.  Specifically, if other files
-    instantiate templates or use macros or inline functions from this
-    file, or you compile this file and link it with other files to
-    produce an executable, this file does not by itself cause the
-    resulting executable to be covered by the GNU General Public
-    License.  This exception does not however invalidate any other
-    reasons why the executable file might be covered by the GNU General
-    Public License.
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 */
 
-struct Circular_buffer
+typedef struct Circular_buffer
   {
   uint8_t * buffer;
   unsigned buffer_size;		/* capacity == buffer_size - 1 */
   unsigned get;			/* buffer is empty when get == put */
   unsigned put;
-  };
+  } Circular_buffer;
 
-static inline void Cb_reset( struct Circular_buffer * const cb )
-  { cb->get = 0; cb->put = 0; }
-
-static inline bool Cb_init( struct Circular_buffer * const cb,
+static inline bool Cb_init( Circular_buffer * const cb,
                             const unsigned buf_size )
   {
   cb->buffer_size = buf_size + 1;
@@ -44,35 +33,39 @@ static inline bool Cb_init( struct Circular_buffer * const cb,
   cb->put = 0;
   cb->buffer =
     ( cb->buffer_size > 1 ) ? (uint8_t *)malloc( cb->buffer_size ) : 0;
-  return ( cb->buffer != 0 );
+  return cb->buffer != 0;
   }
 
-static inline void Cb_free( struct Circular_buffer * const cb )
+static inline void Cb_free( Circular_buffer * const cb )
   { free( cb->buffer ); cb->buffer = 0; }
 
-static inline unsigned Cb_used_bytes( const struct Circular_buffer * const cb )
+static inline void Cb_reset( Circular_buffer * const cb )
+  { cb->get = 0; cb->put = 0; }
+
+static inline unsigned Cb_empty( const Circular_buffer * const cb )
+  { return cb->get == cb->put; }
+
+static inline unsigned Cb_used_bytes( const Circular_buffer * const cb )
   { return ( (cb->get <= cb->put) ? 0 : cb->buffer_size ) + cb->put - cb->get; }
 
-static inline unsigned Cb_free_bytes( const struct Circular_buffer * const cb )
+static inline unsigned Cb_free_bytes( const Circular_buffer * const cb )
   { return ( (cb->get <= cb->put) ? cb->buffer_size : 0 ) - cb->put + cb->get - 1; }
 
-static inline uint8_t Cb_get_byte( struct Circular_buffer * const cb )
+static inline uint8_t Cb_get_byte( Circular_buffer * const cb )
   {
   const uint8_t b = cb->buffer[cb->get];
   if( ++cb->get >= cb->buffer_size ) cb->get = 0;
   return b;
   }
 
-static inline void Cb_put_byte( struct Circular_buffer * const cb,
-                                const uint8_t b )
+static inline void Cb_put_byte( Circular_buffer * const cb, const uint8_t b )
   {
   cb->buffer[cb->put] = b;
   if( ++cb->put >= cb->buffer_size ) cb->put = 0;
   }
 
 
-static bool Cb_unread_data( struct Circular_buffer * const cb,
-                            const unsigned size )
+static bool Cb_unread_data( Circular_buffer * const cb, const unsigned size )
   {
   if( size > Cb_free_bytes( cb ) ) return false;
   if( cb->get >= size ) cb->get -= size;
@@ -81,10 +74,11 @@ static bool Cb_unread_data( struct Circular_buffer * const cb,
   }
 
 
-/* Copies up to 'out_size' bytes to 'out_buffer' and updates 'get'.
-   Returns the number of bytes copied.
+/* Copy up to 'out_size' bytes to 'out_buffer' and update 'get'.
+   If 'out_buffer' is null, the bytes are discarded.
+   Return the number of bytes copied or discarded.
 */
-static unsigned Cb_read_data( struct Circular_buffer * const cb,
+static unsigned Cb_read_data( Circular_buffer * const cb,
                               uint8_t * const out_buffer,
                               const unsigned out_size )
   {
@@ -95,7 +89,7 @@ static unsigned Cb_read_data( struct Circular_buffer * const cb,
     size = min( cb->buffer_size - cb->get, out_size );
     if( size > 0 )
       {
-      memcpy( out_buffer, cb->buffer + cb->get, size );
+      if( out_buffer ) memcpy( out_buffer, cb->buffer + cb->get, size );
       cb->get += size;
       if( cb->get >= cb->buffer_size ) cb->get = 0;
       }
@@ -105,7 +99,7 @@ static unsigned Cb_read_data( struct Circular_buffer * const cb,
     const unsigned size2 = min( cb->put - cb->get, out_size - size );
     if( size2 > 0 )
       {
-      memcpy( out_buffer + size, cb->buffer + cb->get, size2 );
+      if( out_buffer ) memcpy( out_buffer + size, cb->buffer + cb->get, size2 );
       cb->get += size2;
       size += size2;
       }
@@ -114,10 +108,10 @@ static unsigned Cb_read_data( struct Circular_buffer * const cb,
   }
 
 
-/* Copies up to 'in_size' bytes from 'in_buffer' and updates 'put'.
-   Returns the number of bytes copied.
+/* Copy up to 'in_size' bytes from 'in_buffer' and update 'put'.
+   Return the number of bytes copied.
 */
-static unsigned Cb_write_data( struct Circular_buffer * const cb,
+static unsigned Cb_write_data( Circular_buffer * const cb,
                                const uint8_t * const in_buffer,
                                const unsigned in_size )
   {

configure

@@ -1,19 +1,21 @@
 #! /bin/sh
 # configure script for Lzlib - Compression library for the lzip format
-# Copyright (C) 2009-2016 Antonio Diaz Diaz.
+# Copyright (C) 2009-2025 Antonio Diaz Diaz.
 #
 # This configure script is free software: you have unlimited permission
-# to copy, distribute and modify it.
+# to copy, distribute, and modify it.
 
 pkgname=lzlib
-pkgversion=1.8
+pkgversion=1.15
 soversion=1
+libname=lz
+libname_static=lib${libname}.a
+libname_shared=
 progname=minilzip
 progname_static=${progname}
 progname_shared=
 progname_lzip=${progname}
 disable_ldconfig=
-libname=lz
 srctrigger=doc/${pkgname}.texi
 
 # clear some things potentially inherited from environment.
@@ -29,16 +31,15 @@ infodir='$(datarootdir)/info'
 libdir='$(exec_prefix)/lib'
 mandir='$(datarootdir)/man'
 CC=gcc
+AR=ar
 CPPFLAGS=
 CFLAGS='-Wall -W -O2'
 LDFLAGS=
+ARFLAGS=-rcs
+MAKEINFO=makeinfo
 
 # checking whether we are using GNU C.
-if /bin/sh -c "${CC} --version" > /dev/null 2>&1 ; then true
-else
-	CC=cc
-	CFLAGS='-W -O2'
-fi
+/bin/sh -c "${CC} --version" > /dev/null 2>&1 || { CC=cc ; CFLAGS=-O2 ; }
 
 # Loop over all args
 args=
@@ -50,22 +51,26 @@ while [ $# != 0 ] ; do
 	shift
 
 	# Add the argument quoted to args
-	args="${args} \"${option}\""
+	if [ -z "${args}" ] ; then args="\"${option}\""
+	else args="${args} \"${option}\"" ; fi
 
 	# Split out the argument for options that take them
 	case ${option} in
-	*=*) optarg=`echo ${option} | sed -e 's,^[^=]*=,,;s,/$,,'` ;;
+	*=*) optarg=`echo "${option}" | sed -e 's,^[^=]*=,,;s,/$,,'` ;;
 	esac
 
 	# Process the options
 	case ${option} in
 	--help | -h)
-		echo "Usage: configure [options]"
+		echo "Usage: $0 [OPTION]... [VAR=VALUE]..."
 		echo
-		echo "Options: [defaults in brackets]"
+		echo "To assign makefile variables (e.g., CC, CFLAGS...), specify them as"
+		echo "arguments to configure in the form VAR=VALUE."
+		echo
+		echo "Options and variables: [defaults in brackets]"
 		echo "  -h, --help            display this help and exit"
 		echo "  -V, --version         output version information and exit"
-		echo "  --srcdir=DIR          find the sources in DIR [. or ..]"
+		echo "  --srcdir=DIR          find the source code in DIR [. or ..]"
 		echo "  --prefix=DIR          install into DIR [${prefix}]"
 		echo "  --exec-prefix=DIR     base directory for arch-dependent files [${exec_prefix}]"
 		echo "  --bindir=DIR          user executables directory [${bindir}]"
@@ -79,9 +84,13 @@ while [ $# != 0 ] ; do
 		echo "  --enable-shared       build also a shared library [disable]"
 		echo "  --disable-ldconfig    don't run ldconfig after install"
 		echo "  CC=COMPILER           C compiler to use [${CC}]"
-		echo "  CPPFLAGS=OPTIONS      command line options for the preprocessor [${CPPFLAGS}]"
-		echo "  CFLAGS=OPTIONS        command line options for the C compiler [${CFLAGS}]"
-		echo "  LDFLAGS=OPTIONS       command line options for the linker [${LDFLAGS}]"
+		echo "  AR=ARCHIVER           library archiver to use [${AR}]"
+		echo "  CPPFLAGS=OPTIONS      command-line options for the preprocessor [${CPPFLAGS}]"
+		echo "  CFLAGS=OPTIONS        command-line options for the C compiler [${CFLAGS}]"
+		echo "  CFLAGS+=OPTIONS       append options to the current value of CFLAGS"
+		echo "  LDFLAGS=OPTIONS       command-line options for the linker [${LDFLAGS}]"
+		echo "  ARFLAGS=OPTIONS       command-line options for the library archiver [${ARFLAGS}]"
+		echo "  MAKEINFO=NAME         makeinfo program to use [${MAKEINFO}]"
 		echo
 		exit 0 ;;
 	--version | -V)
@@ -108,16 +117,25 @@ while [ $# != 0 ] ; do
 	--mandir=*)            mandir=${optarg} ;;
 	--no-create)              no_create=yes ;;
 	--disable-static)
+		libname_static=
 		progname_static=
+		libname_shared=lib${libname}.so.${soversion}
+		progname_shared=${progname}_shared
+		progname_lzip=${progname}_shared ;;
+	--enable-shared)
+		libname_shared=lib${libname}.so.${soversion}
 		progname_shared=${progname}_shared
 		progname_lzip=${progname}_shared ;;
-	--enable-shared) progname_shared=${progname}_shared ;;
 	--disable-ldconfig) disable_ldconfig=yes ;;
 
-	CC=*)             CC=${optarg} ;;
-	CPPFLAGS=*) CPPFLAGS=${optarg} ;;
-	CFLAGS=*)     CFLAGS=${optarg} ;;
-	LDFLAGS=*)   LDFLAGS=${optarg} ;;
+	CC=*)              CC=${optarg} ;;
+	AR=*)              AR=${optarg} ;;
+	CPPFLAGS=*)  CPPFLAGS=${optarg} ;;
+	CFLAGS=*)      CFLAGS=${optarg} ;;
+	CFLAGS+=*)     CFLAGS="${CFLAGS} ${optarg}" ;;
+	LDFLAGS=*)    LDFLAGS=${optarg} ;;
+	ARFLAGS=*)    ARFLAGS=${optarg} ;;
+	MAKEINFO=*)  MAKEINFO=${optarg} ;;
 
 	--*)
 		echo "configure: WARNING: unrecognized option: '${option}'" 1>&2 ;;
@@ -128,7 +146,7 @@ while [ $# != 0 ] ; do
 		exit 1 ;;
 	esac
 
-	# Check if the option took a separate argument
+	# Check whether the option took a separate argument
 	if [ "${arg2}" = yes ] ; then
 		if [ $# != 0 ] ; then args="${args} \"$1\"" ; shift
 		else echo "configure: Missing argument to '${option}'" 1>&2
@@ -137,19 +155,19 @@ while [ $# != 0 ] ; do
 	fi
 done
 
-# Find the source files, if location was not specified.
+# Find the source code, if location was not specified.
 srcdirtext=
 if [ -z "${srcdir}" ] ; then
 	srcdirtext="or . or .." ; srcdir=.
 	if [ ! -r "${srcdir}/${srctrigger}" ] ; then srcdir=.. ; fi
 	if [ ! -r "${srcdir}/${srctrigger}" ] ; then
 		## the sed command below emulates the dirname command
-		srcdir=`echo $0 | sed -e 's,[^/]*$,,;s,/$,,;s,^$,.,'`
+		srcdir=`echo "$0" | sed -e 's,[^/]*$,,;s,/$,,;s,^$,.,'`
 	fi
 fi
 
 if [ ! -r "${srcdir}/${srctrigger}" ] ; then
-	echo "configure: Can't find sources in ${srcdir} ${srcdirtext}" 1>&2
+	echo "configure: Can't find source code in ${srcdir} ${srcdirtext}" 1>&2
 	echo "configure: (At least ${srctrigger} is missing)." 1>&2
 	exit 1
 fi
@@ -167,9 +185,9 @@ if [ -z "${no_create}" ] ; then
 # Run this file to recreate the current configuration.
 #
 # This script is free software: you have unlimited permission
-# to copy, distribute and modify it.
+# to copy, distribute, and modify it.
 
-exec /bin/sh $0 ${args} --no-create
+exec /bin/sh "$0" ${args} --no-create
 EOF
 	chmod +x config.status
 fi
@@ -185,27 +203,32 @@ echo "infodir = ${infodir}"
 echo "libdir = ${libdir}"
 echo "mandir = ${mandir}"
 echo "CC = ${CC}"
+echo "AR = ${AR}"
 echo "CPPFLAGS = ${CPPFLAGS}"
 echo "CFLAGS = ${CFLAGS}"
 echo "LDFLAGS = ${LDFLAGS}"
+echo "ARFLAGS = ${ARFLAGS}"
+echo "MAKEINFO = ${MAKEINFO}"
 rm -f Makefile
 cat > Makefile << EOF
 # Makefile for Lzlib - Compression library for the lzip format
-# Copyright (C) 2009-2016 Antonio Diaz Diaz.
+# Copyright (C) 2009-2025 Antonio Diaz Diaz.
 # This file was generated automatically by configure. Don't edit.
 #
 # This Makefile is free software: you have unlimited permission
-# to copy, distribute and modify it.
+# to copy, distribute, and modify it.
 
 pkgname = ${pkgname}
 pkgversion = ${pkgversion}
 soversion = ${soversion}
+libname = ${libname}
+libname_static = ${libname_static}
+libname_shared = ${libname_shared}
 progname = ${progname}
 progname_static = ${progname_static}
 progname_shared = ${progname_shared}
 progname_lzip = ${progname_lzip}
 disable_ldconfig = ${disable_ldconfig}
-libname = ${libname}
 VPATH = ${srcdir}
 prefix = ${prefix}
 exec_prefix = ${exec_prefix}
@@ -216,9 +239,12 @@ infodir = ${infodir}
 libdir = ${libdir}
 mandir = ${mandir}
 CC = ${CC}
+AR = ${AR}
 CPPFLAGS = ${CPPFLAGS}
 CFLAGS = ${CFLAGS}
 LDFLAGS = ${LDFLAGS}
+ARFLAGS = ${ARFLAGS}
+MAKEINFO = ${MAKEINFO}
 EOF
 cat "${srcdir}/Makefile.in" >> Makefile
 

decoder.c

@@ -1,167 +1,148 @@
-/*  Lzlib - Compression library for the lzip format
-    Copyright (C) 2009-2016 Antonio Diaz Diaz.
+/* Lzlib - Compression library for the lzip format
+   Copyright (C) 2009-2025 Antonio Diaz Diaz.
 
-    This library is free software: you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation, either version 2 of the License, or
-    (at your option) any later version.
+   This library is free software. Redistribution and use in source and
+   binary forms, with or without modification, are permitted provided
+   that the following conditions are met:
 
-    This library is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
+   1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions, and the following disclaimer.
 
-    You should have received a copy of the GNU General Public License
-    along with this library.  If not, see <http://www.gnu.org/licenses/>.
+   2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions, and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
 
-    As a special exception, you may use this file as part of a free
-    software library without restriction.  Specifically, if other files
-    instantiate templates or use macros or inline functions from this
-    file, or you compile this file and link it with other files to
-    produce an executable, this file does not by itself cause the
-    resulting executable to be covered by the GNU General Public
-    License.  This exception does not however invalidate any other
-    reasons why the executable file might be covered by the GNU General
-    Public License.
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 */
 
-static bool LZd_verify_trailer( struct LZ_decoder * const d )
+static int LZd_try_check_trailer( LZ_decoder * const d )
   {
-  File_trailer trailer;
-  int size = Rd_read_data( d->rdec, trailer, Ft_size );
+  Lzip_trailer trailer;
+  if( Rd_available_bytes( d->rdec ) < Lt_size )
+    { if( !d->rdec->at_stream_end ) return 0; else return 2; }
+  d->check_trailer_pending = false;
+  d->member_finished = true;
 
-  if( size < Ft_size )
-    return false;
-
-  return ( Ft_get_data_crc( trailer ) == LZd_crc( d ) &&
-           Ft_get_data_size( trailer ) == LZd_data_position( d ) &&
-           Ft_get_member_size( trailer ) == d->rdec->member_position );
+  if( Rd_read_data( d->rdec, trailer, Lt_size ) == Lt_size &&
+      Lt_get_data_crc( trailer ) == LZd_crc( d ) &&
+      Lt_get_data_size( trailer ) == LZd_data_position( d ) &&
+      Lt_get_member_size( trailer ) == d->rdec->member_position ) return 0;
+  return 3;
   }
 
 
 /* Return value: 0 = OK, 1 = decoder error, 2 = unexpected EOF,
                  3 = trailer error, 4 = unknown marker found,
-                 5 = library error. */
-static int LZd_decode_member( struct LZ_decoder * const d )
+                 5 = nonzero first LZMA byte found, 6 = library error. */
+static int LZd_decode_member( LZ_decoder * const d )
   {
-  struct Range_decoder * const rdec = d->rdec;
+  Range_decoder * const rdec = d->rdec;
   State * const state = &d->state;
-/*  unsigned long long old_mpos = d->rdec->member_position; */
+  unsigned old_mpos = rdec->member_position;
 
   if( d->member_finished ) return 0;
-  if( !Rd_try_reload( rdec, false ) )
-    { if( !rdec->at_stream_end ) return 0; else return 2; }
-  if( d->verify_trailer_pending )
-    {
-    if( Rd_available_bytes( rdec ) < Ft_size && !rdec->at_stream_end )
-      return 0;
-    d->verify_trailer_pending = false;
-    d->member_finished = true;
-    if( LZd_verify_trailer( d ) ) return 0; else return 3;
-    }
+  const int tmp = Rd_try_reload( rdec );
+  if( tmp > 1 ) return 5;
+  if( !tmp ) { if( !rdec->at_stream_end ) return 0; else return 2; }
+  if( d->check_trailer_pending ) return LZd_try_check_trailer( d );
 
   while( !Rd_finished( rdec ) )
     {
-    const int pos_state = LZd_data_position( d ) & pos_state_mask;
-/*    const unsigned long long mpos = d->rdec->member_position;
-    if( mpos - old_mpos > rd_min_available_bytes ) return 5;
-    old_mpos = mpos; */
-    if( !Rd_enough_available_bytes( rdec ) )	/* check unexpected eof */
-      { if( !rdec->at_stream_end ) return 0; else break; }
+    const unsigned mpos = rdec->member_position;
+    if( mpos - old_mpos > rd_min_available_bytes ) return 6;
+    old_mpos = mpos;
+    if( !Rd_enough_available_bytes( rdec ) )	/* check unexpected EOF */
+      { if( !rdec->at_stream_end ) return 0;
+        if( Cb_empty( &rdec->cb ) ) break; }	/* decode until EOF */
     if( !LZd_enough_free_bytes( d ) ) return 0;
-    if( Rd_decode_bit( rdec, &d->bm_match[*state][pos_state] ) == 0 )	/* 1st bit */
+    const int pos_state = LZd_data_position( d ) & pos_state_mask;
+    if( Rd_decode_bit( rdec, &d->bm_match[*state][pos_state] ) == 0 ) /* 1st bit */
       {
-      const uint8_t prev_byte = LZd_peek_prev( d );
-      if( St_is_char( *state ) )
+      /* literal byte */
+      Bit_model * const bm = d->bm_literal[get_lit_state(LZd_peek_prev( d ))];
+      if( ( *state = St_set_char( *state ) ) < 4 )
+        LZd_put_byte( d, Rd_decode_tree8( rdec, bm ) );
+      else
+        LZd_put_byte( d, Rd_decode_matched( rdec, bm, LZd_peek( d, d->rep0 ) ) );
+      continue;
+      }
+    /* match or repeated match */
+    int len;
+    if( Rd_decode_bit( rdec, &d->bm_rep[*state] ) != 0 )	/* 2nd bit */
+      {
+      if( Rd_decode_bit( rdec, &d->bm_rep0[*state] ) == 0 )	/* 3rd bit */
         {
-        *state -= ( *state < 4 ) ? *state : 3;
-        LZd_put_byte( d, Rd_decode_tree( rdec,
-                      d->bm_literal[get_lit_state(prev_byte)], 8 ) );
+        if( Rd_decode_bit( rdec, &d->bm_len[*state][pos_state] ) == 0 )	/* 4th bit */
+          { *state = St_set_shortrep( *state );
+            LZd_put_byte( d, LZd_peek( d, d->rep0 ) ); continue; }
         }
       else
         {
-        *state -= ( *state < 10 ) ? 3 : 6;
-        LZd_put_byte( d, Rd_decode_matched( rdec,
-                      d->bm_literal[get_lit_state(prev_byte)],
-                      LZd_peek( d, d->rep0 ) ) );
+        unsigned distance;
+        if( Rd_decode_bit( rdec, &d->bm_rep1[*state] ) == 0 )	/* 4th bit */
+          distance = d->rep1;
+        else
+          {
+          if( Rd_decode_bit( rdec, &d->bm_rep2[*state] ) == 0 )	/* 5th bit */
+            distance = d->rep2;
+          else
+            { distance = d->rep3; d->rep3 = d->rep2; }
+          d->rep2 = d->rep1;
+          }
+        d->rep1 = d->rep0;
+        d->rep0 = distance;
         }
+      *state = St_set_rep( *state );
+      len = Rd_decode_len( rdec, &d->rep_len_model, pos_state );
       }
-    else					/* match or repeated match */
+    else					/* match */
       {
-      int len;
-      if( Rd_decode_bit( rdec, &d->bm_rep[*state] ) != 0 )	/* 2nd bit */
+      len = Rd_decode_len( rdec, &d->match_len_model, pos_state );
+      unsigned distance = Rd_decode_tree6( rdec, d->bm_dis_slot[get_len_state(len)] );
+      if( distance >= start_dis_model )
         {
-        if( Rd_decode_bit( rdec, &d->bm_rep0[*state] ) != 0 )	/* 3rd bit */
-          {
-          unsigned distance;
-          if( Rd_decode_bit( rdec, &d->bm_rep1[*state] ) == 0 )	/* 4th bit */
-            distance = d->rep1;
-          else
-            {
-            if( Rd_decode_bit( rdec, &d->bm_rep2[*state] ) == 0 )	/* 5th bit */
-              distance = d->rep2;
-            else
-              { distance = d->rep3; d->rep3 = d->rep2; }
-            d->rep2 = d->rep1;
-            }
-          d->rep1 = d->rep0;
-          d->rep0 = distance;
-          }
+        const unsigned dis_slot = distance;
+        const int direct_bits = ( dis_slot >> 1 ) - 1;
+        distance = ( 2 | ( dis_slot & 1 ) ) << direct_bits;
+        if( dis_slot < end_dis_model )
+          distance += Rd_decode_tree_reversed( rdec,
+                      d->bm_dis + ( distance - dis_slot ), direct_bits );
         else
           {
-          if( Rd_decode_bit( rdec, &d->bm_len[*state][pos_state] ) == 0 )	/* 4th bit */
-            { *state = St_set_short_rep( *state );
-              LZd_put_byte( d, LZd_peek( d, d->rep0 ) ); continue; }
-          }
-        *state = St_set_rep( *state );
-        len = min_match_len + Rd_decode_len( rdec, &d->rep_len_model, pos_state );
-        }
-      else					/* match */
-        {
-        const unsigned rep0_saved = d->rep0;
-        int dis_slot;
-        len = min_match_len + Rd_decode_len( rdec, &d->match_len_model, pos_state );
-        dis_slot = Rd_decode_tree6( rdec, d->bm_dis_slot[get_len_state(len)] );
-        if( dis_slot < start_dis_model ) d->rep0 = dis_slot;
-        else
-          {
-          const int direct_bits = ( dis_slot >> 1 ) - 1;
-          d->rep0 = ( 2 | ( dis_slot & 1 ) ) << direct_bits;
-          if( dis_slot < end_dis_model )
-            d->rep0 += Rd_decode_tree_reversed( rdec,
-                       d->bm_dis + d->rep0 - dis_slot - 1, direct_bits );
-          else
+          distance +=
+            Rd_decode( rdec, direct_bits - dis_align_bits ) << dis_align_bits;
+          distance += Rd_decode_tree_reversed4( rdec, d->bm_align );
+          if( distance == 0xFFFFFFFFU )		/* marker found */
             {
-            d->rep0 += Rd_decode( rdec, direct_bits - dis_align_bits ) << dis_align_bits;
-            d->rep0 += Rd_decode_tree_reversed4( rdec, d->bm_align );
-            if( d->rep0 == 0xFFFFFFFFU )		/* marker found */
+            Rd_normalize( rdec );
+            const unsigned mpos = rdec->member_position;
+            if( mpos - old_mpos > rd_min_available_bytes ) return 6;
+            old_mpos = mpos;
+            if( len == min_match_len )		/* End Of Stream marker */
               {
-              d->rep0 = rep0_saved;
-              Rd_normalize( rdec );
-              if( len == min_match_len )	/* End Of Stream marker */
-                {
-                if( Rd_available_bytes( rdec ) < Ft_size && !rdec->at_stream_end )
-                  { d->verify_trailer_pending = true; return 0; }
-                d->member_finished = true;
-                if( LZd_verify_trailer( d ) ) return 0; else return 3;
-                }
-              if( len == min_match_len + 1 )	/* Sync Flush marker */
-                {
-                if( Rd_try_reload( rdec, true ) ) { /*old_mpos += 5;*/ continue; }
-                else { if( !rdec->at_stream_end ) return 0; else break; }
-                }
-              return 4;
+              d->check_trailer_pending = true;
+              return LZd_try_check_trailer( d );
               }
+            if( len == min_match_len + 1 )	/* Sync Flush marker */
+              {
+              rdec->reload_pending = true;
+              const int tmp = Rd_try_reload( rdec );
+              if( tmp > 1 ) return 5;
+              if( tmp ) continue;
+              if( !rdec->at_stream_end ) return 0; else break;
+              }
+            return 4;
             }
           }
-        d->rep3 = d->rep2; d->rep2 = d->rep1; d->rep1 = rep0_saved;
-        *state = St_set_match( *state );
-        if( d->rep0 >= d->dictionary_size ||
-            ( d->rep0 >= d->cb.put && !d->pos_wrapped ) )
-          return 1;
         }
-      LZd_copy_block( d, d->rep0, len );
+      d->rep3 = d->rep2; d->rep2 = d->rep1; d->rep1 = d->rep0; d->rep0 = distance;
+      *state = St_set_match( *state );
+      if( d->rep0 >= d->dictionary_size ||
+          ( d->rep0 >= d->cb.put && !d->pos_wrapped ) ) return 1;
       }
+    LZd_copy_block( d, d->rep0, len );
     }
   return 2;
   }

decoder.h

@@ -1,43 +1,35 @@
-/*  Lzlib - Compression library for the lzip format
-    Copyright (C) 2009-2016 Antonio Diaz Diaz.
+/* Lzlib - Compression library for the lzip format
+   Copyright (C) 2009-2025 Antonio Diaz Diaz.
 
-    This library is free software: you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation, either version 2 of the License, or
-    (at your option) any later version.
+   This library is free software. Redistribution and use in source and
+   binary forms, with or without modification, are permitted provided
+   that the following conditions are met:
 
-    This library is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
+   1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions, and the following disclaimer.
 
-    You should have received a copy of the GNU General Public License
-    along with this library.  If not, see <http://www.gnu.org/licenses/>.
+   2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions, and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
 
-    As a special exception, you may use this file as part of a free
-    software library without restriction.  Specifically, if other files
-    instantiate templates or use macros or inline functions from this
-    file, or you compile this file and link it with other files to
-    produce an executable, this file does not by itself cause the
-    resulting executable to be covered by the GNU General Public
-    License.  This exception does not however invalidate any other
-    reasons why the executable file might be covered by the GNU General
-    Public License.
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 */
 
-enum { rd_min_available_bytes = 8 };
+enum { rd_min_available_bytes = 10 };
 
-struct Range_decoder
+typedef struct Range_decoder
   {
-  struct Circular_buffer cb;		/* input buffer */
+  Circular_buffer cb;			/* input buffer */
   unsigned long long member_position;
   uint32_t code;
   uint32_t range;
   bool at_stream_end;
   bool reload_pending;
-  };
+  } Range_decoder;
 
-static inline bool Rd_init( struct Range_decoder * const rdec )
+static inline bool Rd_init( Range_decoder * const rdec )
   {
   if( !Cb_init( &rdec->cb, 65536 + rd_min_available_bytes ) ) return false;
   rdec->member_position = 0;
@@ -48,25 +40,25 @@ static inline bool Rd_init( struct Range_decoder * const rdec )
   return true;
   }
 
-static inline void Rd_free( struct Range_decoder * const rdec )
+static inline void Rd_free( Range_decoder * const rdec )
   { Cb_free( &rdec->cb ); }
 
-static inline bool Rd_finished( const struct Range_decoder * const rdec )
-  { return rdec->at_stream_end && !Cb_used_bytes( &rdec->cb ); }
+static inline bool Rd_finished( const Range_decoder * const rdec )
+  { return rdec->at_stream_end && Cb_empty( &rdec->cb ); }
 
-static inline void Rd_finish( struct Range_decoder * const rdec )
+static inline void Rd_finish( Range_decoder * const rdec )
   { rdec->at_stream_end = true; }
 
-static inline bool Rd_enough_available_bytes( const struct Range_decoder * const rdec )
-  { return ( Cb_used_bytes( &rdec->cb ) >= rd_min_available_bytes ); }
+static inline bool Rd_enough_available_bytes( const Range_decoder * const rdec )
+  { return Cb_used_bytes( &rdec->cb ) >= rd_min_available_bytes; }
 
-static inline unsigned Rd_available_bytes( const struct Range_decoder * const rdec )
+static inline unsigned Rd_available_bytes( const Range_decoder * const rdec )
   { return Cb_used_bytes( &rdec->cb ); }
 
-static inline unsigned Rd_free_bytes( const struct Range_decoder * const rdec )
-  { if( rdec->at_stream_end ) return 0; return Cb_free_bytes( &rdec->cb ); }
+static inline unsigned Rd_free_bytes( const Range_decoder * const rdec )
+  { return rdec->at_stream_end ? 0 : Cb_free_bytes( &rdec->cb ); }
 
-static inline unsigned long long Rd_purge( struct Range_decoder * const rdec )
+static inline unsigned long long Rd_purge( Range_decoder * const rdec )
   {
   const unsigned long long size =
     rdec->member_position + Cb_used_bytes( &rdec->cb );
@@ -75,32 +67,32 @@ static inline unsigned long long Rd_purge( struct Range_decoder * const rdec )
   return size;
   }
 
-static inline void Rd_reset( struct Range_decoder * const rdec )
+static inline void Rd_reset( Range_decoder * const rdec )
   { Cb_reset( &rdec->cb );
     rdec->member_position = 0; rdec->at_stream_end = false; }
 
 
-/* Seeks a member header and updates 'get'. '*skippedp' is set to the
-   number of bytes skipped. Returns true if it finds a valid header.
+/* Seek for a member header and update 'get'. Set '*skippedp' to the number
+   of bytes skipped. Return true if a valid header is found.
 */
-static bool Rd_find_header( struct Range_decoder * const rdec,
-                            int * const skippedp )
+static bool Rd_find_header( Range_decoder * const rdec,
+                            unsigned * const skippedp )
   {
   *skippedp = 0;
   while( rdec->cb.get != rdec->cb.put )
     {
-    if( rdec->cb.buffer[rdec->cb.get] == magic_string[0] )
+    if( rdec->cb.buffer[rdec->cb.get] == lzip_magic[0] )
       {
       unsigned get = rdec->cb.get;
       int i;
-      File_header header;
-      for( i = 0; i < Fh_size; ++i )
+      Lzip_header header;
+      for( i = 0; i < Lh_size; ++i )
         {
         if( get == rdec->cb.put ) return false;		/* not enough data */
         header[i] = rdec->cb.buffer[get];
         if( ++get >= rdec->cb.buffer_size ) get = 0;
         }
-      if( Fh_verify( header ) ) return true;
+      if( Lh_check( header ) ) return true;
       }
     if( ++rdec->cb.get >= rdec->cb.buffer_size ) rdec->cb.get = 0;
     ++*skippedp;
@@ -109,20 +101,22 @@ static bool Rd_find_header( struct Range_decoder * const rdec,
   }
 
 
-static inline int Rd_write_data( struct Range_decoder * const rdec,
+static inline int Rd_write_data( Range_decoder * const rdec,
                                  const uint8_t * const inbuf, const int size )
   {
   if( rdec->at_stream_end || size <= 0 ) return 0;
   return Cb_write_data( &rdec->cb, inbuf, size );
   }
 
-static inline uint8_t Rd_get_byte( struct Range_decoder * const rdec )
+static inline uint8_t Rd_get_byte( Range_decoder * const rdec )
   {
+  /* 0xFF avoids decoder error if member is truncated at EOS marker */
+  if( Rd_finished( rdec ) ) return 0xFF;
   ++rdec->member_position;
   return Cb_get_byte( &rdec->cb );
   }
 
-static inline int Rd_read_data( struct Range_decoder * const rdec,
+static inline int Rd_read_data( Range_decoder * const rdec,
                                 uint8_t * const outbuf, const int size )
   {
   const int sz = Cb_read_data( &rdec->cb, outbuf, size );
@@ -130,7 +124,7 @@ static inline int Rd_read_data( struct Range_decoder * const rdec,
   return sz;
   }
 
-static inline bool Rd_unread_data( struct Range_decoder * const rdec,
+static inline bool Rd_unread_data( Range_decoder * const rdec,
                                    const unsigned size )
   {
   if( size > rdec->member_position || !Cb_unread_data( &rdec->cb, size ) )
@@ -139,172 +133,211 @@ static inline bool Rd_unread_data( struct Range_decoder * const rdec,
   return true;
   }
 
-static bool Rd_try_reload( struct Range_decoder * const rdec, const bool force )
+static int Rd_try_reload( Range_decoder * const rdec )
   {
-  if( force ) rdec->reload_pending = true;
   if( rdec->reload_pending && Rd_available_bytes( rdec ) >= 5 )
     {
-    int i;
     rdec->reload_pending = false;
     rdec->code = 0;
-    for( i = 0; i < 5; ++i )
-      rdec->code = (rdec->code << 8) | Rd_get_byte( rdec );
     rdec->range = 0xFFFFFFFFU;
-    rdec->code &= rdec->range;	/* make sure that first byte is discarded */
+    /* check first byte of the LZMA stream without reading it */
+    if( rdec->cb.buffer[rdec->cb.get] != 0 ) return 2;
+    Rd_get_byte( rdec );	/* discard first byte of the LZMA stream */
+    int i; for( i = 0; i < 4; ++i )
+      rdec->code = (rdec->code << 8) | Rd_get_byte( rdec );
     }
   return !rdec->reload_pending;
   }
 
-static inline void Rd_normalize( struct Range_decoder * const rdec )
+static inline void Rd_normalize( Range_decoder * const rdec )
   {
   if( rdec->range <= 0x00FFFFFFU )
-    {
-    rdec->range <<= 8;
-    rdec->code = (rdec->code << 8) | Rd_get_byte( rdec );
-    }
+    { rdec->range <<= 8; rdec->code = (rdec->code << 8) | Rd_get_byte( rdec ); }
   }
 
-static inline int Rd_decode( struct Range_decoder * const rdec,
-                             const int num_bits )
+static inline unsigned Rd_decode( Range_decoder * const rdec,
+                                  const int num_bits )
   {
-  int symbol = 0;
+  unsigned symbol = 0;
   int i;
   for( i = num_bits; i > 0; --i )
     {
-    uint32_t mask;
     Rd_normalize( rdec );
     rdec->range >>= 1;
 /*    symbol <<= 1; */
 /*    if( rdec->code >= rdec->range ) { rdec->code -= rdec->range; symbol |= 1; } */
-    mask = 0U - (rdec->code < rdec->range);
-    rdec->code -= rdec->range;
-    rdec->code += rdec->range & mask;
-    symbol = (symbol << 1) + (mask + 1);
+    const bool bit = rdec->code >= rdec->range;
+    symbol <<= 1; symbol += bit;
+    rdec->code -= rdec->range & ( 0U - bit );
     }
   return symbol;
   }
 
-static inline int Rd_decode_bit( struct Range_decoder * const rdec,
-                                 Bit_model * const probability )
+static inline unsigned Rd_decode_bit( Range_decoder * const rdec,
+                                      Bit_model * const probability )
   {
-  uint32_t bound;
   Rd_normalize( rdec );
-  bound = ( rdec->range >> bit_model_total_bits ) * *probability;
+  const uint32_t bound = ( rdec->range >> bit_model_total_bits ) * *probability;
   if( rdec->code < bound )
     {
     rdec->range = bound;
-    *probability += (bit_model_total - *probability) >> bit_model_move_bits;
+    *probability += ( bit_model_total - *probability ) >> bit_model_move_bits;
     return 0;
     }
   else
     {
-    rdec->range -= bound;
     rdec->code -= bound;
+    rdec->range -= bound;
     *probability -= *probability >> bit_model_move_bits;
     return 1;
     }
   }
 
-static inline int Rd_decode_tree( struct Range_decoder * const rdec,
-                                  Bit_model bm[], const int num_bits )
+static inline void Rd_decode_symbol_bit( Range_decoder * const rdec,
+                         Bit_model * const probability, unsigned * symbol )
   {
-  int symbol = 1;
-  int i;
-  for( i = num_bits; i > 0; --i )
-    symbol = ( symbol << 1 ) | Rd_decode_bit( rdec, &bm[symbol] );
-  return symbol - (1 << num_bits);
+  Rd_normalize( rdec );
+  *symbol <<= 1;
+  const uint32_t bound = ( rdec->range >> bit_model_total_bits ) * *probability;
+  if( rdec->code < bound )
+    {
+    rdec->range = bound;
+    *probability += ( bit_model_total - *probability ) >> bit_model_move_bits;
+    }
+  else
+    {
+    rdec->code -= bound;
+    rdec->range -= bound;
+    *probability -= *probability >> bit_model_move_bits;
+    *symbol |= 1;
+    }
   }
 
-static inline int Rd_decode_tree6( struct Range_decoder * const rdec,
-                                   Bit_model bm[] )
+static inline void Rd_decode_symbol_bit_reversed( Range_decoder * const rdec,
+                         Bit_model * const probability, unsigned * model,
+                         unsigned * symbol, const int i )
   {
-  int symbol = 1;
-  symbol = ( symbol << 1 ) | Rd_decode_bit( rdec, &bm[symbol] );
-  symbol = ( symbol << 1 ) | Rd_decode_bit( rdec, &bm[symbol] );
-  symbol = ( symbol << 1 ) | Rd_decode_bit( rdec, &bm[symbol] );
-  symbol = ( symbol << 1 ) | Rd_decode_bit( rdec, &bm[symbol] );
-  symbol = ( symbol << 1 ) | Rd_decode_bit( rdec, &bm[symbol] );
-  symbol = ( symbol << 1 ) | Rd_decode_bit( rdec, &bm[symbol] );
+  Rd_normalize( rdec );
+  *model <<= 1;
+  const uint32_t bound = ( rdec->range >> bit_model_total_bits ) * *probability;
+  if( rdec->code < bound )
+    {
+    rdec->range = bound;
+    *probability += ( bit_model_total - *probability ) >> bit_model_move_bits;
+    }
+  else
+    {
+    rdec->code -= bound;
+    rdec->range -= bound;
+    *probability -= *probability >> bit_model_move_bits;
+    *model |= 1;
+    *symbol |= 1 << i;
+    }
+  }
+
+static inline unsigned Rd_decode_tree6( Range_decoder * const rdec,
+                                        Bit_model bm[] )
+  {
+  unsigned symbol = 1;
+  Rd_decode_symbol_bit( rdec, &bm[symbol], &symbol );
+  Rd_decode_symbol_bit( rdec, &bm[symbol], &symbol );
+  Rd_decode_symbol_bit( rdec, &bm[symbol], &symbol );
+  Rd_decode_symbol_bit( rdec, &bm[symbol], &symbol );
+  Rd_decode_symbol_bit( rdec, &bm[symbol], &symbol );
+  Rd_decode_symbol_bit( rdec, &bm[symbol], &symbol );
   return symbol & 0x3F;
   }
 
-static inline int Rd_decode_tree_reversed( struct Range_decoder * const rdec,
-                                           Bit_model bm[], const int num_bits )
+static inline unsigned Rd_decode_tree8( Range_decoder * const rdec,
+                                        Bit_model bm[] )
   {
-  int model = 1;
-  int symbol = 0;
-  int i;
-  for( i = 0; i < num_bits; ++i )
-    {
-    const bool bit = Rd_decode_bit( rdec, &bm[model] );
-    model <<= 1;
-    if( bit ) { ++model; symbol |= (1 << i); }
-    }
-  return symbol;
-  }
-
-static inline int Rd_decode_tree_reversed4( struct Range_decoder * const rdec,
-                                            Bit_model bm[] )
-  {
-  int model = 1;
-  int symbol = Rd_decode_bit( rdec, &bm[model] );
-  int bit;
-  model = (model << 1) + symbol;
-  bit = Rd_decode_bit( rdec, &bm[model] );
-  model = (model << 1) + bit; symbol |= (bit << 1);
-  bit = Rd_decode_bit( rdec, &bm[model] );
-  model = (model << 1) + bit; symbol |= (bit << 2);
-  if( Rd_decode_bit( rdec, &bm[model] ) ) symbol |= 8;
-  return symbol;
-  }
-
-static inline int Rd_decode_matched( struct Range_decoder * const rdec,
-                                     Bit_model bm[], int match_byte )
-  {
-  Bit_model * const bm1 = bm + 0x100;
-  int symbol = 1;
-  while( symbol < 0x100 )
-    {
-    int match_bit, bit;
-    match_byte <<= 1;
-    match_bit = match_byte & 0x100;
-    bit = Rd_decode_bit( rdec, &bm1[match_bit+symbol] );
-    symbol = ( symbol << 1 ) | bit;
-    if( match_bit != bit << 8 )
-      {
-      while( symbol < 0x100 )
-        symbol = ( symbol << 1 ) | Rd_decode_bit( rdec, &bm[symbol] );
-      break;
-      }
-    }
+  unsigned symbol = 1;
+  Rd_decode_symbol_bit( rdec, &bm[symbol], &symbol );
+  Rd_decode_symbol_bit( rdec, &bm[symbol], &symbol );
+  Rd_decode_symbol_bit( rdec, &bm[symbol], &symbol );
+  Rd_decode_symbol_bit( rdec, &bm[symbol], &symbol );
+  Rd_decode_symbol_bit( rdec, &bm[symbol], &symbol );
+  Rd_decode_symbol_bit( rdec, &bm[symbol], &symbol );
+  Rd_decode_symbol_bit( rdec, &bm[symbol], &symbol );
+  Rd_decode_symbol_bit( rdec, &bm[symbol], &symbol );
   return symbol & 0xFF;
   }
 
-static inline int Rd_decode_len( struct Range_decoder * const rdec,
-                                 struct Len_model * const lm,
-                                 const int pos_state )
+static inline unsigned
+Rd_decode_tree_reversed( Range_decoder * const rdec,
+                         Bit_model bm[], const int num_bits )
   {
+  unsigned model = 1;
+  unsigned symbol = 0;
+  int i;
+  for( i = 0; i < num_bits; ++i )
+    Rd_decode_symbol_bit_reversed( rdec, &bm[model], &model, &symbol, i );
+  return symbol;
+  }
+
+static inline unsigned
+Rd_decode_tree_reversed4( Range_decoder * const rdec, Bit_model bm[] )
+  {
+  unsigned model = 1;
+  unsigned symbol = 0;
+  Rd_decode_symbol_bit_reversed( rdec, &bm[model], &model, &symbol, 0 );
+  Rd_decode_symbol_bit_reversed( rdec, &bm[model], &model, &symbol, 1 );
+  Rd_decode_symbol_bit_reversed( rdec, &bm[model], &model, &symbol, 2 );
+  Rd_decode_symbol_bit_reversed( rdec, &bm[model], &model, &symbol, 3 );
+  return symbol;
+  }
+
+static inline unsigned Rd_decode_matched( Range_decoder * const rdec,
+                                          Bit_model bm[], unsigned match_byte )
+  {
+  unsigned symbol = 1;
+  unsigned mask = 0x100;
+  while( true )
+    {
+    const unsigned match_bit = ( match_byte <<= 1 ) & mask;
+    const unsigned bit = Rd_decode_bit( rdec, &bm[symbol+match_bit+mask] );
+    symbol <<= 1; symbol += bit;
+    if( symbol > 0xFF ) return symbol & 0xFF;
+    mask &= ~(match_bit ^ (bit << 8));	/* if( match_bit != bit ) mask = 0; */
+    }
+  }
+
+static inline unsigned Rd_decode_len( Range_decoder * const rdec,
+                                      Len_model * const lm,
+                                      const int pos_state )
+  {
+  Bit_model * bm;
+  unsigned mask, offset, symbol = 1;
+
   if( Rd_decode_bit( rdec, &lm->choice1 ) == 0 )
-    return Rd_decode_tree( rdec, lm->bm_low[pos_state], len_low_bits );
+    { bm = lm->bm_low[pos_state]; mask = 7; offset = 0; goto len3; }
   if( Rd_decode_bit( rdec, &lm->choice2 ) == 0 )
-    return len_low_symbols +
-           Rd_decode_tree( rdec, lm->bm_mid[pos_state], len_mid_bits );
-  return len_low_symbols + len_mid_symbols +
-         Rd_decode_tree( rdec, lm->bm_high, len_high_bits );
+    { bm = lm->bm_mid[pos_state]; mask = 7; offset = len_low_symbols; goto len3; }
+  bm = lm->bm_high; mask = 0xFF; offset = len_low_symbols + len_mid_symbols;
+  Rd_decode_symbol_bit( rdec, &bm[symbol], &symbol );
+  Rd_decode_symbol_bit( rdec, &bm[symbol], &symbol );
+  Rd_decode_symbol_bit( rdec, &bm[symbol], &symbol );
+  Rd_decode_symbol_bit( rdec, &bm[symbol], &symbol );
+  Rd_decode_symbol_bit( rdec, &bm[symbol], &symbol );
+len3:
+  Rd_decode_symbol_bit( rdec, &bm[symbol], &symbol );
+  Rd_decode_symbol_bit( rdec, &bm[symbol], &symbol );
+  Rd_decode_symbol_bit( rdec, &bm[symbol], &symbol );
+  return ( symbol & mask ) + min_match_len + offset;
   }
 
 
 enum { lzd_min_free_bytes = max_match_len };
 
-struct LZ_decoder
+typedef struct LZ_decoder
   {
-  struct Circular_buffer cb;
+  Circular_buffer cb;
   unsigned long long partial_data_pos;
-  struct Range_decoder * rdec;
+  Range_decoder * rdec;
   unsigned dictionary_size;
   uint32_t crc;
+  bool check_trailer_pending;
   bool member_finished;
-  bool verify_trailer_pending;
   bool pos_wrapped;
   unsigned rep0;		/* rep[0-3] latest four distances */
   unsigned rep1;		/* used for efficient coding of */
@@ -320,31 +353,28 @@ struct LZ_decoder
   Bit_model bm_rep2[states];
   Bit_model bm_len[states][pos_states];
   Bit_model bm_dis_slot[len_states][1<<dis_slot_bits];
-  Bit_model bm_dis[modeled_distances-end_dis_model];
+  Bit_model bm_dis[modeled_distances-end_dis_model+1];
   Bit_model bm_align[dis_align_size];
 
-  struct Len_model match_len_model;
-  struct Len_model rep_len_model;
-  };
+  Len_model match_len_model;
+  Len_model rep_len_model;
+  } LZ_decoder;
 
-static inline bool LZd_enough_free_bytes( const struct LZ_decoder * const d )
+static inline bool LZd_enough_free_bytes( const LZ_decoder * const d )
   { return Cb_free_bytes( &d->cb ) >= lzd_min_free_bytes; }
 
-static inline uint8_t LZd_peek_prev( const struct LZ_decoder * const d )
-  {
-  const unsigned i = ( ( d->cb.put > 0 ) ? d->cb.put : d->cb.buffer_size ) - 1;
-  return d->cb.buffer[i];
-  }
+static inline uint8_t LZd_peek_prev( const LZ_decoder * const d )
+  { return d->cb.buffer[((d->cb.put > 0) ? d->cb.put : d->cb.buffer_size)-1]; }
 
-static inline uint8_t LZd_peek( const struct LZ_decoder * const d,
+static inline uint8_t LZd_peek( const LZ_decoder * const d,
                                 const unsigned distance )
   {
-  unsigned i = d->cb.put - distance - 1;
-  if( d->cb.put <= distance ) i += d->cb.buffer_size;
+  const unsigned i = ( (d->cb.put > distance) ? 0 : d->cb.buffer_size ) +
+                     d->cb.put - distance - 1;
   return d->cb.buffer[i];
   }
 
-static inline void LZd_put_byte( struct LZ_decoder * const d, const uint8_t b )
+static inline void LZd_put_byte( LZ_decoder * const d, const uint8_t b )
   {
   CRC32_update_byte( &d->crc, b );
   d->cb.buffer[d->cb.put] = b;
@@ -352,21 +382,31 @@ static inline void LZd_put_byte( struct LZ_decoder * const d, const uint8_t b )
     { d->partial_data_pos += d->cb.put; d->cb.put = 0; d->pos_wrapped = true; }
   }
 
-static inline void LZd_copy_block( struct LZ_decoder * const d,
+static inline void LZd_copy_block( LZ_decoder * const d,
                                    const unsigned distance, unsigned len )
   {
-  unsigned i = d->cb.put - distance - 1;
-  bool fast;
-  if( d->cb.put <= distance )
-    { i += d->cb.buffer_size;
-      fast = ( len <= d->cb.buffer_size - i && len <= i - d->cb.put ); }
-  else
-    fast = ( len < d->cb.buffer_size - d->cb.put && len <= d->cb.put - i );
-  if( fast )					/* no wrap, no overlap */
+  unsigned lpos = d->cb.put, i = lpos - distance - 1;
+  bool fast, fast2;
+  if( lpos > distance )
     {
-    CRC32_update_buf( &d->crc, d->cb.buffer + i, len );
-    memcpy( d->cb.buffer + d->cb.put, d->cb.buffer + i, len );
-    d->cb.put += len;
+    fast = len < d->cb.buffer_size - lpos;
+    fast2 = fast && len <= lpos - i;
+    }
+  else
+    {
+    i += d->cb.buffer_size;
+    fast = len < d->cb.buffer_size - i;		/* (i == pos) may happen */
+    fast2 = fast && len <= i - lpos;
+    }
+  if( fast )					/* no wrap */
+    {
+    const unsigned tlen = len;
+    if( fast2 )					/* no wrap, no overlap */
+      memcpy( d->cb.buffer + lpos, d->cb.buffer + i, len );
+    else
+      for( ; len > 0; --len ) d->cb.buffer[lpos++] = d->cb.buffer[i++];
+    CRC32_update_buf( &d->crc, d->cb.buffer + d->cb.put, tlen );
+    d->cb.put += tlen;
     }
   else for( ; len > 0; --len )
     {
@@ -375,8 +415,7 @@ static inline void LZd_copy_block( struct LZ_decoder * const d,
     }
   }
 
-static inline bool LZd_init( struct LZ_decoder * const d,
-                             struct Range_decoder * const rde,
+static inline bool LZd_init( LZ_decoder * const d, Range_decoder * const rde,
                              const unsigned dict_size )
   {
   if( !Cb_init( &d->cb, max( 65536, dict_size ) + lzd_min_free_bytes ) )
@@ -385,9 +424,11 @@ static inline bool LZd_init( struct LZ_decoder * const d,
   d->rdec = rde;
   d->dictionary_size = dict_size;
   d->crc = 0xFFFFFFFFU;
+  d->check_trailer_pending = false;
   d->member_finished = false;
-  d->verify_trailer_pending = false;
   d->pos_wrapped = false;
+  /* prev_byte of first byte; also for LZd_peek( 0 ) on corrupt file */
+  d->cb.buffer[d->cb.buffer_size-1] = 0;
   d->rep0 = 0;
   d->rep1 = 0;
   d->rep2 = 0;
@@ -402,23 +443,21 @@ static inline bool LZd_init( struct LZ_decoder * const d,
   Bm_array_init( d->bm_rep2, states );
   Bm_array_init( d->bm_len[0], states * pos_states );
   Bm_array_init( d->bm_dis_slot[0], len_states * (1 << dis_slot_bits) );
-  Bm_array_init( d->bm_dis, modeled_distances - end_dis_model );
+  Bm_array_init( d->bm_dis, modeled_distances - end_dis_model + 1 );
   Bm_array_init( d->bm_align, dis_align_size );
   Lm_init( &d->match_len_model );
   Lm_init( &d->rep_len_model );
-  d->cb.buffer[d->cb.buffer_size-1] = 0;	/* prev_byte of first byte */
   return true;
   }
 
-static inline void LZd_free( struct LZ_decoder * const d )
-  { Cb_free( &d->cb ); }
+static inline void LZd_free( LZ_decoder * const d ) { Cb_free( &d->cb ); }
 
-static inline bool LZd_member_finished( const struct LZ_decoder * const d )
-  { return ( d->member_finished && !Cb_used_bytes( &d->cb ) ); }
+static inline bool LZd_member_finished( const LZ_decoder * const d )
+  { return d->member_finished && Cb_empty( &d->cb ); }
 
-static inline unsigned LZd_crc( const struct LZ_decoder * const d )
+static inline unsigned LZd_crc( const LZ_decoder * const d )
   { return d->crc ^ 0xFFFFFFFFU; }
 
 static inline unsigned long long
-LZd_data_position( const struct LZ_decoder * const d )
+LZd_data_position( const LZ_decoder * const d )
   { return d->partial_data_pos + d->cb.put; }

doc/minilzip.1

@@ -1,12 +1,26 @@
-.\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.46.1.
-.TH MINILZIP "1" "May 2016" "minilzip 1.8" "User Commands"
+.\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.49.2.
+.TH MINILZIP "1" "January 2025" "minilzip 1.15" "User Commands"
 .SH NAME
 minilzip \- reduces the size of files
 .SH SYNOPSIS
 .B minilzip
 [\fI\,options\/\fR] [\fI\,files\/\fR]
 .SH DESCRIPTION
-Minilzip \- Test program for the lzlib library.
+Minilzip is a test program for the compression library lzlib. Minilzip is
+not intended to be installed because lzip has more features, but minilzip is
+well tested and you can use it as your main compressor if so you wish.
+.PP
+Lzip is a lossless data compressor with a user interface similar to the one
+of gzip or bzip2. Lzip uses a simplified form of LZMA (Lempel\-Ziv\-Markov
+chain\-Algorithm) designed to achieve complete interoperability between
+implementations. The maximum dictionary size is 512 MiB so that any lzip
+file can be decompressed on 32\-bit machines. Lzip provides accurate and
+robust 3\-factor integrity checking. 'lzip \fB\-0\fR' compresses about as fast as
+gzip, while 'lzip \fB\-9\fR' compresses most files more than bzip2. Decompression
+speed is intermediate between gzip and bzip2. Lzip provides better data
+recovery capabilities than gzip and bzip2. Lzip has been designed, written,
+and tested with great care to replace gzip and bzip2 as general\-purpose
+compressed format for Unix\-like systems.
 .SH OPTIONS
 .TP
 \fB\-h\fR, \fB\-\-help\fR
@@ -19,13 +33,13 @@ output version information and exit
 exit with error status if trailing data
 .TP
 \fB\-b\fR, \fB\-\-member\-size=\fR<bytes>
-set member size limit in bytes
+set member size limit of multimember files
 .TP
 \fB\-c\fR, \fB\-\-stdout\fR
 write to standard output, keep input files
 .TP
 \fB\-d\fR, \fB\-\-decompress\fR
-decompress
+decompress, test compressed file integrity
 .TP
 \fB\-f\fR, \fB\-\-force\fR
 overwrite existing output files
@@ -40,7 +54,7 @@ keep (don't delete) input files
 set match length limit in bytes [36]
 .TP
 \fB\-o\fR, \fB\-\-output=\fR<file>
-if reading standard input, write to <file>
+write to <file>, keep input files
 .TP
 \fB\-q\fR, \fB\-\-quiet\fR
 suppress all messages
@@ -65,31 +79,59 @@ alias for \fB\-0\fR
 .TP
 \fB\-\-best\fR
 alias for \fB\-9\fR
+.TP
+\fB\-\-loose\-trailing\fR
+allow trailing data seeming corrupt header
+.TP
+\fB\-\-check\-lib\fR
+compare version of lzlib.h with liblz.{a,so}
 .PP
 If no file names are given, or if a file is '\-', minilzip compresses or
 decompresses from standard input to standard output.
 Numbers may be followed by a multiplier: k = kB = 10^3 = 1000,
 Ki = KiB = 2^10 = 1024, M = 10^6, Mi = 2^20, G = 10^9, Gi = 2^30, etc...
-Dictionary sizes 12 to 29 are interpreted as powers of two, meaning 2^12
-to 2^29 bytes.
+Dictionary sizes 12 to 29 are interpreted as powers of two, meaning 2^12 to
+2^29 bytes.
 .PP
-The bidimensional parameter space of LZMA can't be mapped to a linear
-scale optimal for all files. If your files are large, very repetitive,
-etc, you may need to use the \fB\-\-dictionary\-size\fR and \fB\-\-match\-length\fR
-options directly to achieve optimal performance.
+The bidimensional parameter space of LZMA can't be mapped to a linear scale
+optimal for all files. If your files are large, very repetitive, etc, you
+may need to use the options \fB\-\-dictionary\-size\fR and \fB\-\-match\-length\fR directly
+to achieve optimal performance.
 .PP
-Exit status: 0 for a normal exit, 1 for environmental problems (file
-not found, invalid flags, I/O errors, etc), 2 to indicate a corrupt or
-invalid input file, 3 for an internal consistency error (eg, bug) which
-caused minilzip to panic.
+To extract all the files from archive 'foo.tar.lz', use the commands
+\&'tar \fB\-xf\fR foo.tar.lz' or 'minilzip \fB\-cd\fR foo.tar.lz | tar \fB\-xf\fR \-'.
+.PP
+Exit status: 0 for a normal exit, 1 for environmental problems
+(file not found, invalid command\-line options, I/O errors, etc), 2 to
+indicate a corrupt or invalid input file, 3 for an internal consistency
+error (e.g., bug) which caused minilzip to panic.
+.PP
+The ideas embodied in lzlib are due to (at least) the following people:
+Abraham Lempel and Jacob Ziv (for the LZ algorithm), Andrei Markov (for the
+definition of Markov chains), G.N.N. Martin (for the definition of range
+encoding), Igor Pavlov (for putting all the above together in LZMA), and
+Julian Seward (for bzip2's CLI).
 .SH "REPORTING BUGS"
 Report bugs to lzip\-bug@nongnu.org
 .br
 Lzlib home page: http://www.nongnu.org/lzip/lzlib.html
 .SH COPYRIGHT
-Copyright \(co 2016 Antonio Diaz Diaz.
-Using lzlib 1.8
+Copyright \(co 2025 Antonio Diaz Diaz.
 License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl.html>
 .br
 This is free software: you are free to change and redistribute it.
 There is NO WARRANTY, to the extent permitted by law.
+Using lzlib 1.15
+Using LZ_API_VERSION = 1015
+.SH "SEE ALSO"
+The full documentation for
+.B minilzip
+is maintained as a Texinfo manual.  If the
+.B info
+and
+.B minilzip
+programs are properly installed at your site, the command
+.IP
+.B info lzlib
+.PP
+should give you access to the complete manual.

encoder.c

@@ -1,46 +1,27 @@
-/*  Lzlib - Compression library for the lzip format
-    Copyright (C) 2009-2016 Antonio Diaz Diaz.
+/* Lzlib - Compression library for the lzip format
+   Copyright (C) 2009-2025 Antonio Diaz Diaz.
 
-    This library is free software: you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation, either version 2 of the License, or
-    (at your option) any later version.
+   This library is free software. Redistribution and use in source and
+   binary forms, with or without modification, are permitted provided
+   that the following conditions are met:
 
-    This library is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
+   1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions, and the following disclaimer.
 
-    You should have received a copy of the GNU General Public License
-    along with this library.  If not, see <http://www.gnu.org/licenses/>.
+   2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions, and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
 
-    As a special exception, you may use this file as part of a free
-    software library without restriction.  Specifically, if other files
-    instantiate templates or use macros or inline functions from this
-    file, or you compile this file and link it with other files to
-    produce an executable, this file does not by itself cause the
-    resulting executable to be covered by the GNU General Public
-    License.  This exception does not however invalidate any other
-    reasons why the executable file might be covered by the GNU General
-    Public License.
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 */
 
-static int LZe_get_match_pairs( struct LZ_encoder * const e, struct Pair * pairs )
+static int LZe_get_match_pairs( LZ_encoder * const e, Pair * pairs )
   {
   int32_t * ptr0 = e->eb.mb.pos_array + ( e->eb.mb.cyclic_pos << 1 );
   int32_t * ptr1 = ptr0 + 1;
-  int32_t * newptr;
-  int len = 0, len0 = 0, len1 = 0;
-  int maxlen = 0;
-  int num_pairs = 0;
-  const int pos1 = e->eb.mb.pos + 1;
-  const int min_pos = ( e->eb.mb.pos > e->eb.mb.dictionary_size ) ?
-                        e->eb.mb.pos - e->eb.mb.dictionary_size : 0;
-  const uint8_t * const data = Mb_ptr_to_current_pos( &e->eb.mb );
-  int count, key2, key3, key4, newpos;
-  unsigned tmp;
   int len_limit = e->match_len_limit;
-
   if( len_limit > Mb_available_bytes( &e->eb.mb ) )
     {
     e->been_flushed = true;
@@ -48,54 +29,61 @@ static int LZe_get_match_pairs( struct LZ_encoder * const e, struct Pair * pairs
     if( len_limit < 4 ) { *ptr0 = *ptr1 = 0; return 0; }
     }
 
-  tmp = crc32[data[0]] ^ data[1];
-  key2 = tmp & ( num_prev_positions2 - 1 );
+  int maxlen = 3;			/* only used if pairs != 0 */
+  int num_pairs = 0;
+  const int min_pos = (e->eb.mb.pos > e->eb.mb.dictionary_size) ?
+                       e->eb.mb.pos - e->eb.mb.dictionary_size : 0;
+  const uint8_t * const data = Mb_ptr_to_current_pos( &e->eb.mb );
+
+  unsigned tmp = crc32[data[0]] ^ data[1];
+  const int key2 = tmp & ( num_prev_positions2 - 1 );
   tmp ^= (unsigned)data[2] << 8;
-  key3 = num_prev_positions2 + ( tmp & ( num_prev_positions3 - 1 ) );
-  key4 = num_prev_positions2 + num_prev_positions3 +
-         ( ( tmp ^ ( crc32[data[3]] << 5 ) ) & e->eb.mb.key4_mask );
+  const int key3 = num_prev_positions2 + ( tmp & ( num_prev_positions3 - 1 ) );
+  const int key4 = num_prev_positions2 + num_prev_positions3 +
+                   ( ( tmp ^ ( crc32[data[3]] << 5 ) ) & e->eb.mb.key4_mask );
 
   if( pairs )
     {
-    int np2 = e->eb.mb.prev_positions[key2];
-    int np3 = e->eb.mb.prev_positions[key3];
+    const int np2 = e->eb.mb.prev_positions[key2];
+    const int np3 = e->eb.mb.prev_positions[key3];
     if( np2 > min_pos && e->eb.mb.buffer[np2-1] == data[0] )
       {
       pairs[0].dis = e->eb.mb.pos - np2;
-      pairs[0].len = maxlen = 2;
+      pairs[0].len = maxlen = 2 + ( np2 == np3 );
       num_pairs = 1;
       }
     if( np2 != np3 && np3 > min_pos && e->eb.mb.buffer[np3-1] == data[0] )
       {
       maxlen = 3;
-      np2 = np3;
-      pairs[num_pairs].dis = e->eb.mb.pos - np2;
-      ++num_pairs;
+      pairs[num_pairs++].dis = e->eb.mb.pos - np3;
       }
     if( num_pairs > 0 )
       {
-      const int delta = pos1 - np2;
+      const int delta = pairs[num_pairs-1].dis + 1;
       while( maxlen < len_limit && data[maxlen-delta] == data[maxlen] )
         ++maxlen;
       pairs[num_pairs-1].len = maxlen;
+      if( maxlen < 3 ) maxlen = 3;
       if( maxlen >= len_limit ) pairs = 0;	/* done. now just skip */
       }
-    if( maxlen < 3 ) maxlen = 3;
     }
 
+  const int pos1 = e->eb.mb.pos + 1;
   e->eb.mb.prev_positions[key2] = pos1;
   e->eb.mb.prev_positions[key3] = pos1;
-  newpos = e->eb.mb.prev_positions[key4];
+  int newpos1 = e->eb.mb.prev_positions[key4];
   e->eb.mb.prev_positions[key4] = pos1;
 
+  int len = 0, len0 = 0, len1 = 0;
+
+  int count;
   for( count = e->cycles; ; )
     {
-    int delta;
-    if( newpos <= min_pos || --count < 0 ) { *ptr0 = *ptr1 = 0; break; }
+    if( newpos1 <= min_pos || --count < 0 ) { *ptr0 = *ptr1 = 0; break; }
 
     if( e->been_flushed ) len = 0;
-    delta = pos1 - newpos;
-    newptr = e->eb.mb.pos_array +
+    const int delta = pos1 - newpos1;
+    int32_t * const newptr = e->eb.mb.pos_array +
       ( ( e->eb.mb.cyclic_pos - delta +
           ( (e->eb.mb.cyclic_pos >= delta) ? 0 : e->eb.mb.dictionary_size + 1 ) ) << 1 );
     if( data[len-delta] == data[len] )
@@ -116,16 +104,16 @@ static int LZe_get_match_pairs( struct LZ_encoder * const e, struct Pair * pairs
       }
     if( data[len-delta] < data[len] )
       {
-      *ptr0 = newpos;
+      *ptr0 = newpos1;
       ptr0 = newptr + 1;
-      newpos = *ptr0;
+      newpos1 = *ptr0;
       len0 = len; if( len1 < len ) len = len1;
       }
     else
       {
-      *ptr1 = newpos;
+      *ptr1 = newpos1;
       ptr1 = newptr;
-      newpos = *ptr1;
+      newpos1 = *ptr1;
       len1 = len; if( len0 < len ) len = len0;
       }
     }
@@ -133,7 +121,7 @@ static int LZe_get_match_pairs( struct LZ_encoder * const e, struct Pair * pairs
   }
 
 
-static void LZe_update_distance_prices( struct LZ_encoder * const e )
+static void LZe_update_distance_prices( LZ_encoder * const e )
   {
   int dis, len_state;
   for( dis = start_dis_model; dis < modeled_distances; ++dis )
@@ -141,7 +129,7 @@ static void LZe_update_distance_prices( struct LZ_encoder * const e )
     const int dis_slot = dis_slots[dis];
     const int direct_bits = ( dis_slot >> 1 ) - 1;
     const int base = ( 2 | ( dis_slot & 1 ) ) << direct_bits;
-    const int price = price_symbol_reversed( e->eb.bm_dis + base - dis_slot - 1,
+    const int price = price_symbol_reversed( e->eb.bm_dis + ( base - dis_slot ),
                                              dis - base, direct_bits );
     for( len_state = 0; len_state < len_states; ++len_state )
       e->dis_prices[len_state][dis] = price;
@@ -150,15 +138,15 @@ static void LZe_update_distance_prices( struct LZ_encoder * const e )
   for( len_state = 0; len_state < len_states; ++len_state )
     {
     int * const dsp = e->dis_slot_prices[len_state];
-    int * const dp = e->dis_prices[len_state];
     const Bit_model * const bmds = e->eb.bm_dis_slot[len_state];
     int slot = 0;
     for( ; slot < end_dis_model; ++slot )
-      dsp[slot] = price_symbol( bmds, slot, dis_slot_bits );
+      dsp[slot] = price_symbol6( bmds, slot );
     for( ; slot < e->num_dis_slots; ++slot )
-      dsp[slot] = price_symbol( bmds, slot, dis_slot_bits ) +
+      dsp[slot] = price_symbol6( bmds, slot ) +
                   (((( slot >> 1 ) - 1 ) - dis_align_bits ) << price_shift_bits );
 
+    int * const dp = e->dis_prices[len_state];
     for( dis = 0; dis < start_dis_model; ++dis )
       dp[dis] = dsp[dis];
     for( ; dis < modeled_distances; ++dis )
@@ -167,18 +155,17 @@ static void LZe_update_distance_prices( struct LZ_encoder * const e )
   }
 
 
-/* Returns the number of bytes advanced (ahead).
+/* Return the number of bytes advanced (ahead).
    trials[0]..trials[ahead-1] contain the steps to encode.
-   ( trials[0].dis == -1 ) means literal.
+   ( trials[0].dis4 == -1 ) means literal.
    A match/rep longer or equal than match_len_limit finishes the sequence.
 */
-static int LZe_sequence_optimizer( struct LZ_encoder * const e,
+static int LZe_sequence_optimizer( LZ_encoder * const e,
                                    const int reps[num_rep_distances],
                                    const State state )
   {
-  int main_len, num_pairs, i, rep, cur = 0, num_trials, len;
-  int replens[num_rep_distances];
-  int rep_index = 0;
+  int num_pairs, num_trials;
+  int i, rep, len;
 
   if( e->pending_num_pairs > 0 )		/* from previous call */
     {
@@ -187,17 +174,19 @@ static int LZe_sequence_optimizer( struct LZ_encoder * const e,
     }
   else
     num_pairs = LZe_read_match_distances( e );
-  main_len = ( num_pairs > 0 ) ? e->pairs[num_pairs-1].len : 0;
+  const int main_len = (num_pairs > 0) ? e->pairs[num_pairs-1].len : 0;
 
+  int replens[num_rep_distances];
+  int rep_index = 0;
   for( i = 0; i < num_rep_distances; ++i )
     {
-    replens[i] = Mb_true_match_len( &e->eb.mb, 0, reps[i] + 1, max_match_len );
+    replens[i] = Mb_true_match_len( &e->eb.mb, 0, reps[i] + 1 );
     if( replens[i] > replens[rep_index] ) rep_index = i;
     }
   if( replens[rep_index] >= e->match_len_limit )
     {
     e->trials[0].price = replens[rep_index];
-    e->trials[0].dis = rep_index;
+    e->trials[0].dis4 = rep_index;
     if( !LZe_move_and_update( e, replens[rep_index] ) ) return 0;
     return replens[rep_index];
     }
@@ -205,15 +194,12 @@ static int LZe_sequence_optimizer( struct LZ_encoder * const e,
   if( main_len >= e->match_len_limit )
     {
     e->trials[0].price = main_len;
-    e->trials[0].dis = e->pairs[num_pairs-1].dis + num_rep_distances;
+    e->trials[0].dis4 = e->pairs[num_pairs-1].dis + num_rep_distances;
     if( !LZe_move_and_update( e, main_len ) ) return 0;
     return main_len;
     }
 
-  {
   const int pos_state = Mb_data_position( &e->eb.mb ) & pos_state_mask;
-  const int match_price = price1( e->eb.bm_match[state][pos_state] );
-  const int rep_match_price = match_price + price1( e->eb.bm_rep[state] );
   const uint8_t prev_byte = Mb_peek( &e->eb.mb, 1 );
   const uint8_t cur_byte = Mb_peek( &e->eb.mb, 0 );
   const uint8_t match_byte = Mb_peek( &e->eb.mb, reps[0] + 1 );
@@ -223,7 +209,10 @@ static int LZe_sequence_optimizer( struct LZ_encoder * const e,
     e->trials[1].price += LZeb_price_literal( &e->eb, prev_byte, cur_byte );
   else
     e->trials[1].price += LZeb_price_matched( &e->eb, prev_byte, cur_byte, match_byte );
-  e->trials[1].dis = -1;				/* literal */
+  e->trials[1].dis4 = -1;				/* literal */
+
+  const int match_price = price1( e->eb.bm_match[state][pos_state] );
+  const int rep_match_price = match_price + price1( e->eb.bm_rep[state] );
 
   if( match_byte == cur_byte )
     Tr_update( &e->trials[1], rep_match_price +
@@ -234,7 +223,7 @@ static int LZe_sequence_optimizer( struct LZ_encoder * const e,
   if( num_trials < min_match_len )
     {
     e->trials[0].price = 1;
-    e->trials[0].dis = e->trials[1].dis;
+    e->trials[0].dis4 = e->trials[1].dis4;
     if( !Mb_move_pos( &e->eb.mb ) ) return 0;
     return 1;
     }
@@ -248,9 +237,8 @@ static int LZe_sequence_optimizer( struct LZ_encoder * const e,
 
   for( rep = 0; rep < num_rep_distances; ++rep )
     {
-    int price;
     if( replens[rep] < min_match_len ) continue;
-    price = rep_match_price + LZeb_price_rep( &e->eb, rep, state, pos_state );
+    const int price = rep_match_price + LZeb_price_rep( &e->eb, rep, state, pos_state );
     for( len = min_match_len; len <= replens[rep]; ++len )
       Tr_update( &e->trials[len], price +
                  Lp_price( &e->rep_len_prices, len, pos_state ), rep, 0 );
@@ -259,7 +247,7 @@ static int LZe_sequence_optimizer( struct LZ_encoder * const e,
   if( main_len > replens[0] )
     {
     const int normal_match_price = match_price + price0( e->eb.bm_rep[state] );
-    i = 0, len = max( replens[0] + 1, min_match_len );
+    int i = 0, len = max( replens[0] + 1, min_match_len );
     while( len > e->pairs[i].len ) ++i;
     while( true )
       {
@@ -270,17 +258,10 @@ static int LZe_sequence_optimizer( struct LZ_encoder * const e,
       if( ++len > e->pairs[i].len && ++i >= num_pairs ) break;
       }
     }
-  }
 
+  int cur = 0;
   while( true )				/* price optimization loop */
     {
-    struct Trial *cur_trial, *next_trial;
-    int newlen, pos_state, triable_bytes, len_limit;
-    int start_len = min_match_len;
-    int next_price, match_price, rep_match_price;
-    State cur_state;
-    uint8_t prev_byte, cur_byte, match_byte;
-
     if( !Mb_move_pos( &e->eb.mb ) ) return 0;
     if( ++cur >= num_trials )		/* no more initialized trials */
       {
@@ -288,8 +269,8 @@ static int LZe_sequence_optimizer( struct LZ_encoder * const e,
       return cur;
       }
 
-    num_pairs = LZe_read_match_distances( e );
-    newlen = ( num_pairs > 0 ) ? e->pairs[num_pairs-1].len : 0;
+    const int num_pairs = LZe_read_match_distances( e );
+    const int newlen = (num_pairs > 0) ? e->pairs[num_pairs-1].len : 0;
     if( newlen >= e->match_len_limit )
       {
       e->pending_num_pairs = num_pairs;
@@ -298,9 +279,10 @@ static int LZe_sequence_optimizer( struct LZ_encoder * const e,
       }
 
     /* give final values to current trial */
-    cur_trial = &e->trials[cur];
+    Trial * cur_trial = &e->trials[cur];
+    State cur_state;
     {
-    int dis = cur_trial->dis;
+    const int dis4 = cur_trial->dis4;
     int prev_index = cur_trial->prev_index;
     const int prev_index2 = cur_trial->prev_index2;
 
@@ -309,55 +291,47 @@ static int LZe_sequence_optimizer( struct LZ_encoder * const e,
       cur_state = e->trials[prev_index].state;
       if( prev_index + 1 == cur )			/* len == 1 */
         {
-        if( dis == 0 ) cur_state = St_set_short_rep( cur_state );
+        if( dis4 == 0 ) cur_state = St_set_shortrep( cur_state );
         else cur_state = St_set_char( cur_state );	/* literal */
         }
-      else if( dis < num_rep_distances ) cur_state = St_set_rep( cur_state );
+      else if( dis4 < num_rep_distances ) cur_state = St_set_rep( cur_state );
       else cur_state = St_set_match( cur_state );
       }
-    else if( prev_index2 == dual_step_trial )		/* dis == 0 */
+    else
       {
-      --prev_index;
-      cur_state = e->trials[prev_index].state;
-      cur_state = St_set_char( cur_state );
-      cur_state = St_set_rep( cur_state );
-      }
-    else	/* if( prev_index2 >= 0 ) */
-      {
-      prev_index = prev_index2;
-      cur_state = e->trials[prev_index].state;
-      if( dis < num_rep_distances ) cur_state = St_set_rep( cur_state );
-      else cur_state = St_set_match( cur_state );
-      cur_state = St_set_char( cur_state );
-      cur_state = St_set_rep( cur_state );
+      if( prev_index2 == dual_step_trial )	/* dis4 == 0 (rep0) */
+        --prev_index;
+      else					/* prev_index2 >= 0 */
+        prev_index = prev_index2;
+      cur_state = St_set_char_rep();
       }
     cur_trial->state = cur_state;
     for( i = 0; i < num_rep_distances; ++i )
       cur_trial->reps[i] = e->trials[prev_index].reps[i];
-    mtf_reps( dis, cur_trial->reps );
+    mtf_reps( dis4, cur_trial->reps );		/* literal is ignored */
     }
 
-    pos_state = Mb_data_position( &e->eb.mb ) & pos_state_mask;
-    prev_byte = Mb_peek( &e->eb.mb, 1 );
-    cur_byte = Mb_peek( &e->eb.mb, 0 );
-    match_byte = Mb_peek( &e->eb.mb, cur_trial->reps[0] + 1 );
+    const int pos_state = Mb_data_position( &e->eb.mb ) & pos_state_mask;
+    const uint8_t prev_byte = Mb_peek( &e->eb.mb, 1 );
+    const uint8_t cur_byte = Mb_peek( &e->eb.mb, 0 );
+    const uint8_t match_byte = Mb_peek( &e->eb.mb, cur_trial->reps[0] + 1 );
 
-    next_price = cur_trial->price +
-                 price0( e->eb.bm_match[cur_state][pos_state] );
+    int next_price = cur_trial->price +
+                     price0( e->eb.bm_match[cur_state][pos_state] );
     if( St_is_char( cur_state ) )
       next_price += LZeb_price_literal( &e->eb, prev_byte, cur_byte );
     else
       next_price += LZeb_price_matched( &e->eb, prev_byte, cur_byte, match_byte );
 
     /* try last updates to next trial */
-    next_trial = &e->trials[cur+1];
+    Trial * next_trial = &e->trials[cur+1];
 
     Tr_update( next_trial, next_price, -1, cur );	/* literal */
 
-    match_price = cur_trial->price + price1( e->eb.bm_match[cur_state][pos_state] );
-    rep_match_price = match_price + price1( e->eb.bm_rep[cur_state] );
+    const int match_price = cur_trial->price + price1( e->eb.bm_match[cur_state][pos_state] );
+    const int rep_match_price = match_price + price1( e->eb.bm_rep[cur_state] );
 
-    if( match_byte == cur_byte && next_trial->dis != 0 &&
+    if( match_byte == cur_byte && next_trial->dis4 != 0 &&
         next_trial->prev_index2 == single_step_trial )
       {
       const int price = rep_match_price +
@@ -365,16 +339,16 @@ static int LZe_sequence_optimizer( struct LZ_encoder * const e,
       if( price <= next_trial->price )
         {
         next_trial->price = price;
-        next_trial->dis = 0;
+        next_trial->dis4 = 0;				/* rep0 */
         next_trial->prev_index = cur;
         }
       }
 
-    triable_bytes =
+    const int triable_bytes =
       min( Mb_available_bytes( &e->eb.mb ), max_num_trials - 1 - cur );
     if( triable_bytes < min_match_len ) continue;
 
-    len_limit = min( e->match_len_limit, triable_bytes );
+    const int len_limit = min( e->match_len_limit, triable_bytes );
 
     /* try literal + rep0 */
     if( match_byte != cur_byte && next_trial->prev_index != cur )
@@ -382,27 +356,28 @@ static int LZe_sequence_optimizer( struct LZ_encoder * const e,
       const uint8_t * const data = Mb_ptr_to_current_pos( &e->eb.mb );
       const int dis = cur_trial->reps[0] + 1;
       const int limit = min( e->match_len_limit + 1, triable_bytes );
-      len = 1;
+      int len = 1;
       while( len < limit && data[len-dis] == data[len] ) ++len;
       if( --len >= min_match_len )
         {
         const int pos_state2 = ( pos_state + 1 ) & pos_state_mask;
         const State state2 = St_set_char( cur_state );
         const int price = next_price +
-                  price1( e->eb.bm_match[state2][pos_state2] ) +
-                  price1( e->eb.bm_rep[state2] ) +
-                  LZe_price_rep0_len( e, len, state2, pos_state2 );
+                          price1( e->eb.bm_match[state2][pos_state2] ) +
+                          price1( e->eb.bm_rep[state2] ) +
+                          LZe_price_rep0_len( e, len, state2, pos_state2 );
         while( num_trials < cur + 1 + len )
           e->trials[++num_trials].price = infinite_price;
         Tr_update2( &e->trials[cur+1+len], price, cur + 1 );
         }
       }
 
+    int start_len = min_match_len;
+
     /* try rep distances */
     for( rep = 0; rep < num_rep_distances; ++rep )
       {
       const uint8_t * const data = Mb_ptr_to_current_pos( &e->eb.mb );
-      int price;
       const int dis = cur_trial->reps[rep] + 1;
 
       if( data[0-dis] != data[0] || data[1-dis] != data[1] ) continue;
@@ -410,7 +385,7 @@ static int LZe_sequence_optimizer( struct LZ_encoder * const e,
         if( data[len-dis] != data[len] ) break;
       while( num_trials < cur + len )
         e->trials[++num_trials].price = infinite_price;
-      price = rep_match_price + LZeb_price_rep( &e->eb, rep, cur_state, pos_state );
+      int price = rep_match_price + LZeb_price_rep( &e->eb, rep, cur_state, pos_state );
       for( i = min_match_len; i <= len; ++i )
         Tr_update( &e->trials[cur+i], price +
                    Lp_price( &e->rep_len_prices, i, pos_state ), rep, cur );
@@ -418,17 +393,14 @@ static int LZe_sequence_optimizer( struct LZ_encoder * const e,
       if( rep == 0 ) start_len = len + 1;	/* discard shorter matches */
 
       /* try rep + literal + rep0 */
-      {
       int len2 = len + 1;
       const int limit = min( e->match_len_limit + len2, triable_bytes );
-      int pos_state2;
-      State state2;
       while( len2 < limit && data[len2-dis] == data[len2] ) ++len2;
       len2 -= len + 1;
       if( len2 < min_match_len ) continue;
 
-      pos_state2 = ( pos_state + len ) & pos_state_mask;
-      state2 = St_set_rep( cur_state );
+      int pos_state2 = ( pos_state + len ) & pos_state_mask;
+      State state2 = St_set_rep( cur_state );
       price += Lp_price( &e->rep_len_prices, len, pos_state ) +
                price0( e->eb.bm_match[state2][pos_state2] ) +
                LZeb_price_matched( &e->eb, data[len-1], data[len], data[len-dis] );
@@ -441,25 +413,22 @@ static int LZe_sequence_optimizer( struct LZ_encoder * const e,
         e->trials[++num_trials].price = infinite_price;
       Tr_update3( &e->trials[cur+len+1+len2], price, rep, cur + len + 1, cur );
       }
-      }
 
     /* try matches */
     if( newlen >= start_len && newlen <= len_limit )
       {
-      int dis;
       const int normal_match_price = match_price +
                                      price0( e->eb.bm_rep[cur_state] );
 
       while( num_trials < cur + newlen )
         e->trials[++num_trials].price = infinite_price;
 
-      i = 0;
+      int i = 0;
       while( e->pairs[i].len < start_len ) ++i;
-      dis = e->pairs[i].dis;
+      int dis = e->pairs[i].dis;
       for( len = start_len; ; ++len )
         {
         int price = normal_match_price + LZe_price_pair( e, dis, len, pos_state );
-
         Tr_update( &e->trials[cur+len], price, dis + num_rep_distances, cur );
 
         /* try match + literal + rep0 */
@@ -497,30 +466,26 @@ static int LZe_sequence_optimizer( struct LZ_encoder * const e,
   }
 
 
-static bool LZe_encode_member( struct LZ_encoder * const e )
+static bool LZe_encode_member( LZ_encoder * const e )
   {
-  const bool best = ( e->match_len_limit > 12 );
+  const bool best = e->match_len_limit > 12;
   const int dis_price_count = best ? 1 : 512;
   const int align_price_count = best ? 1 : dis_align_size;
-  const int price_count = ( e->match_len_limit > 36 ) ? 1013 : 4093;
-  int ahead, i;
+  const int price_count = (e->match_len_limit > 36) ? 1013 : 4093;
+  int i;
   State * const state = &e->eb.state;
 
   if( e->eb.member_finished ) return true;
   if( Re_member_position( &e->eb.renc ) >= e->eb.member_size_limit )
-    {
-    if( LZeb_full_flush( &e->eb ) ) e->eb.member_finished = true;
-    return true;
-    }
+    { LZeb_try_full_flush( &e->eb ); return true; }
 
   if( Mb_data_position( &e->eb.mb ) == 0 &&
       !Mb_data_finished( &e->eb.mb ) )		/* encode first byte */
     {
-    const uint8_t prev_byte = 0;
-    uint8_t cur_byte;
     if( !Mb_enough_available_bytes( &e->eb.mb ) ||
         !Re_enough_free_bytes( &e->eb.renc ) ) return true;
-    cur_byte = Mb_peek( &e->eb.mb, 0 );
+    const uint8_t prev_byte = 0;
+    const uint8_t cur_byte = Mb_peek( &e->eb.mb, 0 );
     Re_encode_bit( &e->eb.renc, &e->eb.bm_match[*state][0], 0 );
     LZeb_encode_literal( &e->eb, prev_byte, cur_byte );
     CRC32_update_byte( &e->eb.crc, cur_byte );
@@ -547,8 +512,7 @@ static bool LZe_encode_member( struct LZ_encoder * const e )
       Lp_update_prices( &e->rep_len_prices );
       }
 
-    ahead = LZe_sequence_optimizer( e, e->eb.reps, *state );
-    if( ahead <= 0 ) return false;		/* can't happen */
+    int ahead = LZe_sequence_optimizer( e, e->eb.reps, *state );
     e->price_counter -= ahead;
 
     for( i = 0; ahead > 0; )
@@ -556,33 +520,32 @@ static bool LZe_encode_member( struct LZ_encoder * const e )
       const int pos_state =
         ( Mb_data_position( &e->eb.mb ) - ahead ) & pos_state_mask;
       const int len = e->trials[i].price;
-      const int dis = e->trials[i].dis;
+      int dis = e->trials[i].dis4;
 
-      bool bit = ( dis < 0 );
+      bool bit = dis < 0;
       Re_encode_bit( &e->eb.renc, &e->eb.bm_match[*state][pos_state], !bit );
       if( bit )					/* literal byte */
         {
         const uint8_t prev_byte = Mb_peek( &e->eb.mb, ahead + 1 );
         const uint8_t cur_byte = Mb_peek( &e->eb.mb, ahead );
         CRC32_update_byte( &e->eb.crc, cur_byte );
-        if( St_is_char( *state ) )
+        if( ( *state = St_set_char( *state ) ) < 4 )
           LZeb_encode_literal( &e->eb, prev_byte, cur_byte );
         else
           {
           const uint8_t match_byte = Mb_peek( &e->eb.mb, ahead + e->eb.reps[0] + 1 );
           LZeb_encode_matched( &e->eb, prev_byte, cur_byte, match_byte );
           }
-        *state = St_set_char( *state );
         }
       else					/* match or repeated match */
         {
         CRC32_update_buf( &e->eb.crc, Mb_ptr_to_current_pos( &e->eb.mb ) - ahead, len );
         mtf_reps( dis, e->eb.reps );
-        bit = ( dis < num_rep_distances );
+        bit = dis < num_rep_distances;
         Re_encode_bit( &e->eb.renc, &e->eb.bm_rep[*state], bit );
         if( bit )				/* repeated match */
           {
-          bit = ( dis == 0 );
+          bit = dis == 0;
           Re_encode_bit( &e->eb.renc, &e->eb.bm_rep0[*state], !bit );
           if( bit )
             Re_encode_bit( &e->eb.renc, &e->eb.bm_len[*state][pos_state], len > 1 );
@@ -592,7 +555,7 @@ static bool LZe_encode_member( struct LZ_encoder * const e )
             if( dis > 1 )
               Re_encode_bit( &e->eb.renc, &e->eb.bm_rep2[*state], dis > 2 );
             }
-          if( len == 1 ) *state = St_set_short_rep( *state );
+          if( len == 1 ) *state = St_set_shortrep( *state );
           else
             {
             Re_encode_len( &e->eb.renc, &e->eb.rep_len_model, len, pos_state );
@@ -602,9 +565,9 @@ static bool LZe_encode_member( struct LZ_encoder * const e )
           }
         else					/* match */
           {
-          LZeb_encode_pair( &e->eb, dis - num_rep_distances, len, pos_state );
-          if( get_slot( dis - num_rep_distances ) >= end_dis_model )
-            --e->align_price_counter;
+          dis -= num_rep_distances;
+          LZeb_encode_pair( &e->eb, dis, len, pos_state );
+          if( dis >= modeled_distances ) --e->align_price_counter;
           --e->dis_price_counter;
           Lp_decrement_counter( &e->match_len_prices, pos_state );
           *state = St_set_match( *state );
@@ -614,11 +577,11 @@ static bool LZe_encode_member( struct LZ_encoder * const e )
       if( Re_member_position( &e->eb.renc ) >= e->eb.member_size_limit )
         {
         if( !Mb_dec_pos( &e->eb.mb, ahead ) ) return false;
-        if( LZeb_full_flush( &e->eb ) ) e->eb.member_finished = true;
+        LZeb_try_full_flush( &e->eb );
         return true;
         }
       }
     }
-  if( LZeb_full_flush( &e->eb ) ) e->eb.member_finished = true;
+  LZeb_try_full_flush( &e->eb );
   return true;
   }

encoder.h

@@ -1,56 +1,47 @@
-/*  Lzlib - Compression library for the lzip format
-    Copyright (C) 2009-2016 Antonio Diaz Diaz.
+/* Lzlib - Compression library for the lzip format
+   Copyright (C) 2009-2025 Antonio Diaz Diaz.
 
-    This library is free software: you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation, either version 2 of the License, or
-    (at your option) any later version.
+   This library is free software. Redistribution and use in source and
+   binary forms, with or without modification, are permitted provided
+   that the following conditions are met:
 
-    This library is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
+   1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions, and the following disclaimer.
 
-    You should have received a copy of the GNU General Public License
-    along with this library.  If not, see <http://www.gnu.org/licenses/>.
+   2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions, and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
 
-    As a special exception, you may use this file as part of a free
-    software library without restriction.  Specifically, if other files
-    instantiate templates or use macros or inline functions from this
-    file, or you compile this file and link it with other files to
-    produce an executable, this file does not by itself cause the
-    resulting executable to be covered by the GNU General Public
-    License.  This exception does not however invalidate any other
-    reasons why the executable file might be covered by the GNU General
-    Public License.
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 */
 
-struct Len_prices
+typedef struct Len_prices
   {
-  const struct Len_model * lm;
+  const Len_model * lm;
   int len_symbols;
   int count;
   int prices[pos_states][max_len_symbols];
-  int counters[pos_states];
-  };
+  int counters[pos_states];			/* may decrement below 0 */
+  } Len_prices;
 
-static inline void Lp_update_low_mid_prices( struct Len_prices * const lp,
+static inline void Lp_update_low_mid_prices( Len_prices * const lp,
                                              const int pos_state )
   {
   int * const pps = lp->prices[pos_state];
   int tmp = price0( lp->lm->choice1 );
   int len = 0;
-  lp->counters[pos_state] = lp->count;
   for( ; len < len_low_symbols && len < lp->len_symbols; ++len )
-    pps[len] = tmp + price_symbol( lp->lm->bm_low[pos_state], len, len_low_bits );
+    pps[len] = tmp + price_symbol3( lp->lm->bm_low[pos_state], len );
   if( len >= lp->len_symbols ) return;
   tmp = price1( lp->lm->choice1 ) + price0( lp->lm->choice2 );
   for( ; len < len_low_symbols + len_mid_symbols && len < lp->len_symbols; ++len )
     pps[len] = tmp +
-               price_symbol( lp->lm->bm_mid[pos_state], len - len_low_symbols, len_mid_bits );
+               price_symbol3( lp->lm->bm_mid[pos_state], len - len_low_symbols );
     }
 
-static inline void Lp_update_high_prices( struct Len_prices * const lp )
+static inline void Lp_update_high_prices( Len_prices * const lp )
   {
   const int tmp = price1( lp->lm->choice1 ) + price1( lp->lm->choice2 );
   int len;
@@ -58,161 +49,152 @@ static inline void Lp_update_high_prices( struct Len_prices * const lp )
     /* using 4 slots per value makes "Lp_price" faster */
     lp->prices[3][len] = lp->prices[2][len] =
     lp->prices[1][len] = lp->prices[0][len] = tmp +
-      price_symbol( lp->lm->bm_high, len - len_low_symbols - len_mid_symbols, len_high_bits );
+      price_symbol8( lp->lm->bm_high, len - len_low_symbols - len_mid_symbols );
   }
 
-static inline void Lp_reset( struct Len_prices * const lp )
+static inline void Lp_reset( Len_prices * const lp )
   { int i; for( i = 0; i < pos_states; ++i ) lp->counters[i] = 0; }
 
-static inline void Lp_init( struct Len_prices * const lp,
-                            const struct Len_model * const lm,
+static inline void Lp_init( Len_prices * const lp, const Len_model * const lm,
                             const int match_len_limit )
   {
   lp->lm = lm;
   lp->len_symbols = match_len_limit + 1 - min_match_len;
-  lp->count = ( match_len_limit > 12 ) ? 1 : lp->len_symbols;
+  lp->count = (match_len_limit > 12) ? 1 : lp->len_symbols;
   Lp_reset( lp );
   }
 
-static inline void Lp_decrement_counter( struct Len_prices * const lp,
+static inline void Lp_decrement_counter( Len_prices * const lp,
                                          const int pos_state )
   { --lp->counters[pos_state]; }
 
-static inline void Lp_update_prices( struct Len_prices * const lp )
+static inline void Lp_update_prices( Len_prices * const lp )
   {
   int pos_state;
   bool high_pending = false;
   for( pos_state = 0; pos_state < pos_states; ++pos_state )
     if( lp->counters[pos_state] <= 0 )
-      { Lp_update_low_mid_prices( lp, pos_state ); high_pending = true; }
+      { lp->counters[pos_state] = lp->count;
+        Lp_update_low_mid_prices( lp, pos_state ); high_pending = true; }
   if( high_pending && lp->len_symbols > len_low_symbols + len_mid_symbols )
     Lp_update_high_prices( lp );
   }
 
-static inline int Lp_price( const struct Len_prices * const lp,
-                            const int symbol, const int pos_state )
-  { return lp->prices[pos_state][symbol - min_match_len]; }
+static inline int Lp_price( const Len_prices * const lp,
+                            const int len, const int pos_state )
+  { return lp->prices[pos_state][len - min_match_len]; }
 
 
-struct Pair			/* distance-length pair */
+typedef struct Pair		/* distance-length pair */
   {
   int dis;
   int len;
-  };
+  } Pair;
 
 enum { infinite_price = 0x0FFFFFFF,
        max_num_trials = 1 << 13,
        single_step_trial = -2,
        dual_step_trial = -1 };
 
-struct Trial
+typedef struct Trial
   {
   State state;
   int price;		/* dual use var; cumulative price, match length */
-  int dis;		/* rep index or match distance. (-1 for literal) */
+  int dis4;		/* -1 for literal, or rep, or match distance + 4 */
   int prev_index;	/* index of prev trial in trials[] */
   int prev_index2;	/*   -2  trial is single step */
 			/*   -1  literal + rep0 */
 			/* >= 0  ( rep or match ) + literal + rep0 */
   int reps[num_rep_distances];
-  };
+  } Trial;
 
-static inline void Tr_update( struct Trial * const trial, const int pr,
-                              const int distance, const int p_i )
+static inline void Tr_update( Trial * const trial, const int pr,
+                              const int distance4, const int p_i )
   {
   if( pr < trial->price )
-    {
-    trial->price = pr; trial->dis = distance; trial->prev_index = p_i;
-    trial->prev_index2 = single_step_trial;
-    }
+    { trial->price = pr; trial->dis4 = distance4; trial->prev_index = p_i;
+      trial->prev_index2 = single_step_trial; }
   }
 
-static inline void Tr_update2( struct Trial * const trial, const int pr,
+static inline void Tr_update2( Trial * const trial, const int pr,
                                const int p_i )
   {
   if( pr < trial->price )
-    {
-    trial->price = pr; trial->dis = 0; trial->prev_index = p_i;
-    trial->prev_index2 = dual_step_trial;
-    }
+    { trial->price = pr; trial->dis4 = 0; trial->prev_index = p_i;
+      trial->prev_index2 = dual_step_trial; }
   }
 
-static inline void Tr_update3( struct Trial * const trial, const int pr,
-                               const int distance, const int p_i,
+static inline void Tr_update3( Trial * const trial, const int pr,
+                               const int distance4, const int p_i,
                                const int p_i2 )
   {
   if( pr < trial->price )
-    {
-    trial->price = pr; trial->dis = distance; trial->prev_index = p_i;
-    trial->prev_index2 = p_i2;
-    }
+    { trial->price = pr; trial->dis4 = distance4; trial->prev_index = p_i;
+      trial->prev_index2 = p_i2; }
   }
 
 
-struct LZ_encoder
+typedef struct LZ_encoder
   {
-  struct LZ_encoder_base eb;
+  LZ_encoder_base eb;
   int cycles;
   int match_len_limit;
-  struct Len_prices match_len_prices;
-  struct Len_prices rep_len_prices;
+  Len_prices match_len_prices;
+  Len_prices rep_len_prices;
   int pending_num_pairs;
-  struct Pair pairs[max_match_len+1];
-  struct Trial trials[max_num_trials];
+  Pair pairs[max_match_len+1];
+  Trial trials[max_num_trials];
 
   int dis_slot_prices[len_states][2*max_dictionary_bits];
   int dis_prices[len_states][modeled_distances];
   int align_prices[dis_align_size];
   int num_dis_slots;
-  int price_counter;
+  int price_counter;		/* counters may decrement below 0 */
   int dis_price_counter;
   int align_price_counter;
   bool been_flushed;
-  };
+  } LZ_encoder;
 
-static inline bool Mb_dec_pos( struct Matchfinder_base * const mb,
-                               const int ahead )
+static inline bool Mb_dec_pos( Matchfinder_base * const mb, const int ahead )
   {
   if( ahead < 0 || mb->pos < ahead ) return false;
   mb->pos -= ahead;
+  if( mb->cyclic_pos < ahead ) mb->cyclic_pos += mb->dictionary_size + 1;
   mb->cyclic_pos -= ahead;
-  if( mb->cyclic_pos < 0 ) mb->cyclic_pos += mb->dictionary_size + 1;
   return true;
   }
 
-static int LZe_get_match_pairs( struct LZ_encoder * const e, struct Pair * pairs );
+static int LZe_get_match_pairs( LZ_encoder * const e, Pair * pairs );
 
-       /* move-to-front dis in/into reps if( dis > 0 ) */
-static inline void mtf_reps( const int dis, int reps[num_rep_distances] )
+       /* move-to-front dis in/into reps; do nothing if( dis4 <= 0 ) */
+static inline void mtf_reps( const int dis4, int reps[num_rep_distances] )
   {
-  int i;
-  if( dis >= num_rep_distances )
+  if( dis4 >= num_rep_distances )			/* match */
     {
-    for( i = num_rep_distances - 1; i > 0; --i ) reps[i] = reps[i-1];
-    reps[0] = dis - num_rep_distances;
+    reps[3] = reps[2]; reps[2] = reps[1]; reps[1] = reps[0];
+    reps[0] = dis4 - num_rep_distances;
     }
-  else if( dis > 0 )
+  else if( dis4 > 0 )				/* repeated match */
     {
-    const int distance = reps[dis];
-    for( i = dis; i > 0; --i ) reps[i] = reps[i-1];
+    const int distance = reps[dis4];
+    int i; for( i = dis4; i > 0; --i ) reps[i] = reps[i-1];
     reps[0] = distance;
     }
   }
 
-static inline int LZeb_price_shortrep( const struct LZ_encoder_base * const eb,
+static inline int LZeb_price_shortrep( const LZ_encoder_base * const eb,
                                        const State state, const int pos_state )
   {
   return price0( eb->bm_rep0[state] ) + price0( eb->bm_len[state][pos_state] );
   }
 
-static inline int LZeb_price_rep( const struct LZ_encoder_base * const eb,
-                                  const int rep,
-                                  const State state, const int pos_state )
+static inline int LZeb_price_rep( const LZ_encoder_base * const eb,
+                                  const int rep, const State state,
+                                  const int pos_state )
   {
-  int price;
   if( rep == 0 ) return price0( eb->bm_rep0[state] ) +
                         price1( eb->bm_len[state][pos_state] );
-  price = price1( eb->bm_rep0[state] );
+  int price = price1( eb->bm_rep0[state] );
   if( rep == 1 )
     price += price0( eb->bm_rep1[state] );
   else
@@ -223,15 +205,15 @@ static inline int LZeb_price_rep( const struct LZ_encoder_base * const eb,
   return price;
   }
 
-static inline int LZe_price_rep0_len( const struct LZ_encoder * const e,
-                                      const int len,
-                                      const State state, const int pos_state )
+static inline int LZe_price_rep0_len( const LZ_encoder * const e,
+                                      const int len, const State state,
+                                      const int pos_state )
   {
   return LZeb_price_rep( &e->eb, 0, state, pos_state ) +
          Lp_price( &e->rep_len_prices, len, pos_state );
   }
 
-static inline int LZe_price_pair( const struct LZ_encoder * const e,
+static inline int LZe_price_pair( const LZ_encoder * const e,
                                   const int dis, const int len,
                                   const int pos_state )
   {
@@ -244,23 +226,20 @@ static inline int LZe_price_pair( const struct LZ_encoder * const e,
            e->align_prices[dis & (dis_align_size - 1)];
   }
 
-static inline int LZe_read_match_distances( struct LZ_encoder * const e )
+static inline int LZe_read_match_distances( LZ_encoder * const e )
   {
   const int num_pairs = LZe_get_match_pairs( e, e->pairs );
   if( num_pairs > 0 )
     {
-    int len = e->pairs[num_pairs-1].len;
+    const int len = e->pairs[num_pairs-1].len;
     if( len == e->match_len_limit && len < max_match_len )
-      {
-      len += Mb_true_match_len( &e->eb.mb, len, e->pairs[num_pairs-1].dis + 1,
-                                max_match_len - len );
-      e->pairs[num_pairs-1].len = len;
-      }
+      e->pairs[num_pairs-1].len =
+        Mb_true_match_len( &e->eb.mb, len, e->pairs[num_pairs-1].dis + 1 );
     }
   return num_pairs;
   }
 
-static inline bool LZe_move_and_update( struct LZ_encoder * const e, int n )
+static inline bool LZe_move_and_update( LZ_encoder * const e, int n )
   {
   while( true )
     {
@@ -271,29 +250,29 @@ static inline bool LZe_move_and_update( struct LZ_encoder * const e, int n )
   return true;
   }
 
-static inline void LZe_backward( struct LZ_encoder * const e, int cur )
+static inline void LZe_backward( LZ_encoder * const e, int cur )
   {
-  int * const dis = &e->trials[cur].dis;
+  int dis4 = e->trials[cur].dis4;
   while( cur > 0 )
     {
     const int prev_index = e->trials[cur].prev_index;
-    struct Trial * const prev_trial = &e->trials[prev_index];
+    Trial * const prev_trial = &e->trials[prev_index];
 
     if( e->trials[cur].prev_index2 != single_step_trial )
       {
-      prev_trial->dis = -1;
+      prev_trial->dis4 = -1;					/* literal */
       prev_trial->prev_index = prev_index - 1;
       prev_trial->prev_index2 = single_step_trial;
       if( e->trials[cur].prev_index2 >= 0 )
         {
-        struct Trial * const prev_trial2 = &e->trials[prev_index-1];
-        prev_trial2->dis = *dis; *dis = 0;
+        Trial * const prev_trial2 = &e->trials[prev_index-1];
+        prev_trial2->dis4 = dis4; dis4 = 0;			/* rep0 */
         prev_trial2->prev_index = e->trials[cur].prev_index2;
         prev_trial2->prev_index2 = single_step_trial;
         }
       }
     prev_trial->price = cur - prev_index;			/* len */
-    cur = *dis; *dis = prev_trial->dis; prev_trial->dis = cur;
+    cur = dis4; dis4 = prev_trial->dis4; prev_trial->dis4 = cur;
     cur = prev_index;
     }
   }
@@ -301,11 +280,11 @@ static inline void LZe_backward( struct LZ_encoder * const e, int cur )
 enum { num_prev_positions3 = 1 << 16,
        num_prev_positions2 = 1 << 10 };
 
-static inline bool LZe_init( struct LZ_encoder * const e,
+static inline bool LZe_init( LZ_encoder * const e,
                              const int dict_size, const int len_limit,
                              const unsigned long long member_size )
   {
-  enum { before = max_num_trials + 1,
+  enum { before_size = max_num_trials,
          /* bytes to keep in buffer after pos */
          after_size = max_num_trials + ( 2 * max_match_len ) + 1,
          dict_factor = 2,
@@ -313,10 +292,10 @@ static inline bool LZe_init( struct LZ_encoder * const e,
          pos_array_factor = 2,
          min_free_bytes = 2 * max_num_trials };
 
-  if( !LZeb_init( &e->eb, before, dict_size, after_size, dict_factor,
+  if( !LZeb_init( &e->eb, before_size, dict_size, after_size, dict_factor,
                   num_prev_positions23, pos_array_factor, min_free_bytes,
                   member_size ) ) return false;
-  e->cycles = ( len_limit < max_match_len ) ? 16 + ( len_limit / 2 ) : 256;
+  e->cycles = (len_limit < max_match_len) ? 16 + ( len_limit / 2 ) : 256;
   e->match_len_limit = len_limit;
   Lp_init( &e->match_len_prices, &e->eb.match_len_model, e->match_len_limit );
   Lp_init( &e->rep_len_prices, &e->eb.rep_len_model, e->match_len_limit );
@@ -331,7 +310,7 @@ static inline bool LZe_init( struct LZ_encoder * const e,
   return true;
   }
 
-static inline void LZe_reset( struct LZ_encoder * const e,
+static inline void LZe_reset( LZ_encoder * const e,
                               const unsigned long long member_size )
   {
   LZeb_reset( &e->eb, member_size );

encoder_base.c

@@ -1,42 +1,35 @@
-/*  Lzlib - Compression library for the lzip format
-    Copyright (C) 2009-2016 Antonio Diaz Diaz.
+/* Lzlib - Compression library for the lzip format
+   Copyright (C) 2009-2025 Antonio Diaz Diaz.
 
-    This library is free software: you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation, either version 2 of the License, or
-    (at your option) any later version.
+   This library is free software. Redistribution and use in source and
+   binary forms, with or without modification, are permitted provided
+   that the following conditions are met:
 
-    This library is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
+   1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions, and the following disclaimer.
 
-    You should have received a copy of the GNU General Public License
-    along with this library.  If not, see <http://www.gnu.org/licenses/>.
+   2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions, and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
 
-    As a special exception, you may use this file as part of a free
-    software library without restriction.  Specifically, if other files
-    instantiate templates or use macros or inline functions from this
-    file, or you compile this file and link it with other files to
-    produce an executable, this file does not by itself cause the
-    resulting executable to be covered by the GNU General Public
-    License.  This exception does not however invalidate any other
-    reasons why the executable file might be covered by the GNU General
-    Public License.
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 */
 
-static bool Mb_normalize_pos( struct Matchfinder_base * const mb )
+static bool Mb_normalize_pos( Matchfinder_base * const mb )
   {
   if( mb->pos > mb->stream_pos )
     { mb->pos = mb->stream_pos; return false; }
   if( !mb->at_stream_end )
     {
     int i;
-    const int offset = mb->pos - mb->dictionary_size - mb->before_size;
+    /* offset is int32_t for the min below */
+    const int32_t offset = mb->pos - mb->before_size - mb->dictionary_size;
     const int size = mb->stream_pos - offset;
     memmove( mb->buffer, mb->buffer + offset, size );
     mb->partial_data_pos += offset;
-    mb->pos -= offset;
+    mb->pos -= offset;		/* pos = before_size + dictionary_size */
     mb->stream_pos -= offset;
     for( i = 0; i < mb->num_prev_positions; ++i )
       mb->prev_positions[i] -= min( mb->prev_positions[i], offset );
@@ -47,43 +40,42 @@ static bool Mb_normalize_pos( struct Matchfinder_base * const mb )
   }
 
 
-static bool Mb_init( struct Matchfinder_base * const mb,
-                     const int before, const int dict_size,
-                     const int after_size, const int dict_factor,
-                     const int num_prev_positions23,
+static bool Mb_init( Matchfinder_base * const mb, const int before_size,
+                     const int dict_size, const int after_size,
+                     const int dict_factor, const int num_prev_positions23,
                      const int pos_array_factor )
   {
   const int buffer_size_limit =
-    ( dict_factor * dict_size ) + before + after_size;
-  unsigned size;
+    ( dict_factor * dict_size ) + before_size + after_size;
   int i;
 
   mb->partial_data_pos = 0;
-  mb->before_size = before;
+  mb->before_size = before_size;
   mb->after_size = after_size;
   mb->pos = 0;
   mb->cyclic_pos = 0;
   mb->stream_pos = 0;
+  mb->num_prev_positions23 = num_prev_positions23;
   mb->at_stream_end = false;
-  mb->flushing = false;
+  mb->sync_flush_pending = false;
 
   mb->buffer_size = max( 65536, buffer_size_limit );
   mb->buffer = (uint8_t *)malloc( mb->buffer_size );
   if( !mb->buffer ) return false;
+  mb->saved_dictionary_size = dict_size;
   mb->dictionary_size = dict_size;
   mb->pos_limit = mb->buffer_size - after_size;
-  size = 1 << max( 16, real_bits( mb->dictionary_size - 1 ) - 2 );
-  if( mb->dictionary_size > 1 << 26 )		/* 64 MiB */
-    size >>= 1;
-  mb->key4_mask = size - 1;
-  mb->num_prev_positions23 = num_prev_positions23;
+  unsigned size = 1 << max( 16, real_bits( mb->dictionary_size - 1 ) - 2 );
+  if( mb->dictionary_size > 1 << 26 ) size >>= 1;	/* 64 MiB */
+  mb->key4_mask = size - 1;		/* increases with dictionary size */
   size += num_prev_positions23;
-
   mb->num_prev_positions = size;
+
   mb->pos_array_size = pos_array_factor * ( mb->dictionary_size + 1 );
   size += mb->pos_array_size;
-  if( size * sizeof (int32_t) <= size ) mb->prev_positions = 0;
-  else mb->prev_positions = (int32_t *)malloc( size * sizeof (int32_t) );
+  if( size * sizeof mb->prev_positions[0] <= size ) mb->prev_positions = 0;
+  else mb->prev_positions =
+    (int32_t *)malloc( size * sizeof mb->prev_positions[0] );
   if( !mb->prev_positions ) { free( mb->buffer ); return false; }
   mb->pos_array = mb->prev_positions + mb->num_prev_positions;
   for( i = 0; i < mb->num_prev_positions; ++i ) mb->prev_positions[i] = 0;
@@ -91,26 +83,29 @@ static bool Mb_init( struct Matchfinder_base * const mb,
   }
 
 
-static void Mb_adjust_dictionary_size( struct Matchfinder_base * const mb )
+static void Mb_adjust_array( Matchfinder_base * const mb )
+  {
+  int size = 1 << max( 16, real_bits( mb->dictionary_size - 1 ) - 2 );
+  if( mb->dictionary_size > 1 << 26 ) size >>= 1;	/* 64 MiB */
+  mb->key4_mask = size - 1;
+  size += mb->num_prev_positions23;
+  mb->num_prev_positions = size;
+  mb->pos_array = mb->prev_positions + mb->num_prev_positions;
+  }
+
+
+static void Mb_adjust_dictionary_size( Matchfinder_base * const mb )
   {
   if( mb->stream_pos < mb->dictionary_size )
     {
-    int size;
-    mb->buffer_size =
-    mb->dictionary_size =
-    mb->pos_limit = max( min_dictionary_size, mb->stream_pos );
-    size = 1 << max( 16, real_bits( mb->dictionary_size - 1 ) - 2 );
-    if( mb->dictionary_size > 1 << 26 )
-      size >>= 1;
-    mb->key4_mask = size - 1;
-    size += mb->num_prev_positions23;
-    mb->num_prev_positions = size;
-    mb->pos_array = mb->prev_positions + mb->num_prev_positions;
+    mb->dictionary_size = max( min_dictionary_size, mb->stream_pos );
+    Mb_adjust_array( mb );
+    mb->pos_limit = mb->buffer_size;
     }
   }
 
 
-static void Mb_reset( struct Matchfinder_base * const mb )
+static void Mb_reset( Matchfinder_base * const mb )
   {
   int i;
   if( mb->stream_pos > mb->pos )
@@ -120,60 +115,62 @@ static void Mb_reset( struct Matchfinder_base * const mb )
   mb->pos = 0;
   mb->cyclic_pos = 0;
   mb->at_stream_end = false;
-  mb->flushing = false;
+  mb->sync_flush_pending = false;
+  mb->dictionary_size = mb->saved_dictionary_size;
+  Mb_adjust_array( mb );
+  mb->pos_limit = mb->buffer_size - mb->after_size;
   for( i = 0; i < mb->num_prev_positions; ++i ) mb->prev_positions[i] = 0;
   }
 
 
-     /* End Of Stream mark => (dis == 0xFFFFFFFFU, len == min_match_len) */
-static bool LZeb_full_flush( struct LZ_encoder_base * const eb )
+/* End Of Stream marker => (dis == 0xFFFFFFFFU, len == min_match_len) */
+static void LZeb_try_full_flush( LZ_encoder_base * const eb )
   {
-  int i;
+  if( eb->member_finished || Cb_free_bytes( &eb->renc.cb ) <
+      max_marker_size + eb->renc.ff_count + Lt_size ) return;
+  eb->member_finished = true;
   const int pos_state = Mb_data_position( &eb->mb ) & pos_state_mask;
   const State state = eb->state;
-  File_trailer trailer;
-  if( eb->member_finished ||
-      Cb_free_bytes( &eb->renc.cb ) < max_marker_size + eb->renc.ff_count + Ft_size )
-    return false;
   Re_encode_bit( &eb->renc, &eb->bm_match[state][pos_state], 1 );
   Re_encode_bit( &eb->renc, &eb->bm_rep[state], 0 );
   LZeb_encode_pair( eb, 0xFFFFFFFFU, min_match_len, pos_state );
   Re_flush( &eb->renc );
-  Ft_set_data_crc( trailer, LZeb_crc( eb ) );
-  Ft_set_data_size( trailer, Mb_data_position( &eb->mb ) );
-  Ft_set_member_size( trailer, Re_member_position( &eb->renc ) + Ft_size );
-  for( i = 0; i < Ft_size; ++i )
-    Cb_put_byte( &eb->renc.cb, trailer[i] );
-  return true;
+  Lzip_trailer trailer;
+  Lt_set_data_crc( trailer, LZeb_crc( eb ) );
+  Lt_set_data_size( trailer, Mb_data_position( &eb->mb ) );
+  Lt_set_member_size( trailer, Re_member_position( &eb->renc ) + Lt_size );
+  int i; for( i = 0; i < Lt_size; ++i ) Cb_put_byte( &eb->renc.cb, trailer[i] );
   }
 
 
-     /* Sync Flush mark => (dis == 0xFFFFFFFFU, len == min_match_len + 1) */
-static bool LZeb_sync_flush( struct LZ_encoder_base * const eb )
+/* Sync Flush marker => (dis == 0xFFFFFFFFU, len == min_match_len + 1) */
+static void LZeb_try_sync_flush( LZ_encoder_base * const eb )
   {
-  int i;
+  const unsigned min_size = eb->renc.ff_count + max_marker_size;
+  if( eb->member_finished ||
+      Cb_free_bytes( &eb->renc.cb ) < min_size + max_marker_size ) return;
+  eb->mb.sync_flush_pending = false;
+  const unsigned long long old_mpos = Re_member_position( &eb->renc );
   const int pos_state = Mb_data_position( &eb->mb ) & pos_state_mask;
   const State state = eb->state;
-  if( eb->member_finished ||
-      Cb_free_bytes( &eb->renc.cb ) < (2 * max_marker_size) + eb->renc.ff_count )
-    return false;
-  for( i = 0; i < 2; ++i )	/* 2 consecutive markers guarantee decoding */
-    {
+  do {		/* size of markers must be >= rd_min_available_bytes + 5 */
     Re_encode_bit( &eb->renc, &eb->bm_match[state][pos_state], 1 );
     Re_encode_bit( &eb->renc, &eb->bm_rep[state], 0 );
     LZeb_encode_pair( eb, 0xFFFFFFFFU, min_match_len + 1, pos_state );
     Re_flush( &eb->renc );
     }
-  return true;
+  while( Re_member_position( &eb->renc ) - old_mpos < min_size );
   }
 
 
-static void LZeb_reset( struct LZ_encoder_base * const eb,
+static void LZeb_reset( LZ_encoder_base * const eb,
                         const unsigned long long member_size )
   {
-  int i;
+  const unsigned long long min_member_size = min_dictionary_size;
+  const unsigned long long max_member_size = 0x0008000000000000ULL; /* 2 PiB */
   Mb_reset( &eb->mb );
-  eb->member_size_limit = member_size - Ft_size - max_marker_size;
+  eb->member_size_limit = min( max( min_member_size, member_size ),
+                          max_member_size ) - Lt_size - max_marker_size;
   eb->crc = 0xFFFFFFFFU;
   Bm_array_init( eb->bm_literal[0], (1 << literal_context_bits) * 0x300 );
   Bm_array_init( eb->bm_match[0], states * pos_states );
@@ -183,12 +180,12 @@ static void LZeb_reset( struct LZ_encoder_base * const eb,
   Bm_array_init( eb->bm_rep2, states );
   Bm_array_init( eb->bm_len[0], states * pos_states );
   Bm_array_init( eb->bm_dis_slot[0], len_states * (1 << dis_slot_bits) );
-  Bm_array_init( eb->bm_dis, modeled_distances - end_dis_model );
+  Bm_array_init( eb->bm_dis, modeled_distances - end_dis_model + 1 );
   Bm_array_init( eb->bm_align, dis_align_size );
   Lm_init( &eb->match_len_model );
   Lm_init( &eb->rep_len_model );
-  Re_reset( &eb->renc );
-  for( i = 0; i < num_rep_distances; ++i ) eb->reps[i] = 0;
+  Re_reset( &eb->renc, eb->mb.dictionary_size );
+  int i; for( i = 0; i < num_rep_distances; ++i ) eb->reps[i] = 0;
   eb->state = 0;
   eb->member_finished = false;
   }

encoder_base.h

@@ -1,28 +1,20 @@
-/*  Lzlib - Compression library for the lzip format
-    Copyright (C) 2009-2016 Antonio Diaz Diaz.
+/* Lzlib - Compression library for the lzip format
+   Copyright (C) 2009-2025 Antonio Diaz Diaz.
 
-    This library is free software: you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation, either version 2 of the License, or
-    (at your option) any later version.
+   This library is free software. Redistribution and use in source and
+   binary forms, with or without modification, are permitted provided
+   that the following conditions are met:
 
-    This library is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
+   1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions, and the following disclaimer.
 
-    You should have received a copy of the GNU General Public License
-    along with this library.  If not, see <http://www.gnu.org/licenses/>.
+   2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions, and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
 
-    As a special exception, you may use this file as part of a free
-    software library without restriction.  Specifically, if other files
-    instantiate templates or use macros or inline functions from this
-    file, or you compile this file and link it with other files to
-    produce an executable, this file does not by itself cause the
-    resulting executable to be covered by the GNU General Public
-    License.  This exception does not however invalidate any other
-    reasons why the executable file might be covered by the GNU General
-    Public License.
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 */
 
 enum { price_shift_bits = 6,
@@ -149,22 +141,45 @@ static inline int price0( const Bit_model probability )
 static inline int price1( const Bit_model probability )
   { return get_price( bit_model_total - probability ); }
 
-static inline int price_bit( const Bit_model bm, const int bit )
-  { if( bit ) return price1( bm ); else return price0( bm ); }
+static inline int price_bit( const Bit_model bm, const bool bit )
+  { return bit ? price1( bm ) : price0( bm ); }
 
 
-static inline int price_symbol( const Bit_model bm[], int symbol,
-                                const int num_bits )
+static inline int price_symbol3( const Bit_model bm[], int symbol )
   {
-  int price = 0;
-  symbol |= ( 1 << num_bits );
-  while( symbol > 1 )
-    {
-    const int bit = symbol & 1;
-    symbol >>= 1;
-    price += price_bit( bm[symbol], bit );
-    }
-  return price;
+  bool bit = symbol & 1;
+  symbol |= 8; symbol >>= 1;
+  int price = price_bit( bm[symbol], bit );
+  bit = symbol & 1; symbol >>= 1; price += price_bit( bm[symbol], bit );
+  return price + price_bit( bm[1], symbol & 1 );
+  }
+
+
+static inline int price_symbol6( const Bit_model bm[], unsigned symbol )
+  {
+  bool bit = symbol & 1;
+  symbol |= 64; symbol >>= 1;
+  int price = price_bit( bm[symbol], bit );
+  bit = symbol & 1; symbol >>= 1; price += price_bit( bm[symbol], bit );
+  bit = symbol & 1; symbol >>= 1; price += price_bit( bm[symbol], bit );
+  bit = symbol & 1; symbol >>= 1; price += price_bit( bm[symbol], bit );
+  bit = symbol & 1; symbol >>= 1; price += price_bit( bm[symbol], bit );
+  return price + price_bit( bm[1], symbol & 1 );
+  }
+
+
+static inline int price_symbol8( const Bit_model bm[], int symbol )
+  {
+  bool bit = symbol & 1;
+  symbol |= 0x100; symbol >>= 1;
+  int price = price_bit( bm[symbol], bit );
+  bit = symbol & 1; symbol >>= 1; price += price_bit( bm[symbol], bit );
+  bit = symbol & 1; symbol >>= 1; price += price_bit( bm[symbol], bit );
+  bit = symbol & 1; symbol >>= 1; price += price_bit( bm[symbol], bit );
+  bit = symbol & 1; symbol >>= 1; price += price_bit( bm[symbol], bit );
+  bit = symbol & 1; symbol >>= 1; price += price_bit( bm[symbol], bit );
+  bit = symbol & 1; symbol >>= 1; price += price_bit( bm[symbol], bit );
+  return price + price_bit( bm[1], symbol & 1 );
   }
 
 
@@ -176,37 +191,33 @@ static inline int price_symbol_reversed( const Bit_model bm[], int symbol,
   int i;
   for( i = num_bits; i > 0; --i )
     {
-    const int bit = symbol & 1;
-    price += price_bit( bm[model], bit );
-    model = ( model << 1 ) | bit;
+    const bool bit = symbol & 1;
     symbol >>= 1;
+    price += price_bit( bm[model], bit );
+    model <<= 1; model |= bit;
     }
   return price;
   }
 
 
-static inline int price_matched( const Bit_model bm[], int symbol,
-                                 int match_byte )
+static inline int price_matched( const Bit_model bm[], unsigned symbol,
+                                 unsigned match_byte )
   {
   int price = 0;
-  int mask = 0x100;
+  unsigned mask = 0x100;
   symbol |= mask;
-
-  do {
-    int match_bit, bit;
-    match_byte <<= 1;
-    match_bit = match_byte & mask;
-    symbol <<= 1;
-    bit = symbol & 0x100;
-    price += price_bit( bm[match_bit+(symbol>>9)+mask], bit );
-    mask &= ~(match_byte ^ symbol);	/* if( match_bit != bit ) mask = 0; */
+  while( true )
+    {
+    const unsigned match_bit = ( match_byte <<= 1 ) & mask;
+    const bool bit = ( symbol <<= 1 ) & 0x100;
+    price += price_bit( bm[(symbol>>9)+match_bit+mask], bit );
+    if( symbol >= 0x10000 ) return price;
+    mask &= ~(match_bit ^ symbol);	/* if( match_bit != bit ) mask = 0; */
     }
-  while( symbol < 0x10000 );
-  return price;
   }
 
 
-struct Matchfinder_base
+typedef struct Matchfinder_base
   {
   unsigned long long partial_data_pos;
   uint8_t * buffer;		/* input buffer */
@@ -224,56 +235,55 @@ struct Matchfinder_base
   int num_prev_positions23;
   int num_prev_positions;	/* size of prev_positions */
   int pos_array_size;
+  int saved_dictionary_size;	/* dictionary_size restored by Mb_reset */
   bool at_stream_end;		/* stream_pos shows real end of file */
-  bool flushing;
-  };
+  bool sync_flush_pending;
+  } Matchfinder_base;
 
-static bool Mb_normalize_pos( struct Matchfinder_base * const mb );
+static bool Mb_normalize_pos( Matchfinder_base * const mb );
 
-static bool Mb_init( struct Matchfinder_base * const mb,
-                     const int before, const int dict_size,
-                     const int after_size, const int dict_factor,
-                     const int num_prev_positions23,
+static bool Mb_init( Matchfinder_base * const mb, const int before_size,
+                     const int dict_size, const int after_size,
+                     const int dict_factor, const int num_prev_positions23,
                      const int pos_array_factor );
 
-static inline void Mb_free( struct Matchfinder_base * const mb )
+static inline void Mb_free( Matchfinder_base * const mb )
   { free( mb->prev_positions ); free( mb->buffer ); }
 
-static inline uint8_t Mb_peek( const struct Matchfinder_base * const mb,
+static inline uint8_t Mb_peek( const Matchfinder_base * const mb,
                                const int distance )
   { return mb->buffer[mb->pos-distance]; }
 
-static inline int Mb_available_bytes( const struct Matchfinder_base * const mb )
+static inline int Mb_available_bytes( const Matchfinder_base * const mb )
   { return mb->stream_pos - mb->pos; }
 
 static inline unsigned long long
-Mb_data_position( const struct Matchfinder_base * const mb )
+Mb_data_position( const Matchfinder_base * const mb )
   { return mb->partial_data_pos + mb->pos; }
 
-static inline void Mb_finish( struct Matchfinder_base * const mb )
-  { mb->at_stream_end = true; mb->flushing = false; }
+static inline void Mb_finish( Matchfinder_base * const mb )
+  { mb->at_stream_end = true; mb->sync_flush_pending = false; }
 
-static inline bool Mb_data_finished( const struct Matchfinder_base * const mb )
-  { return mb->at_stream_end && !mb->flushing && mb->pos >= mb->stream_pos; }
+static inline bool Mb_data_finished( const Matchfinder_base * const mb )
+  { return mb->at_stream_end && mb->pos >= mb->stream_pos; }
 
-static inline bool Mb_flushing_or_end( const struct Matchfinder_base * const mb )
-  { return mb->at_stream_end || mb->flushing; }
+static inline bool Mb_flushing_or_end( const Matchfinder_base * const mb )
+  { return mb->at_stream_end || mb->sync_flush_pending; }
 
-static inline int Mb_free_bytes( const struct Matchfinder_base * const mb )
+static inline int Mb_free_bytes( const Matchfinder_base * const mb )
   { if( Mb_flushing_or_end( mb ) ) return 0;
     return mb->buffer_size - mb->stream_pos; }
 
-static inline bool Mb_enough_available_bytes( const struct Matchfinder_base * const mb )
-  {
-  return ( mb->pos + mb->after_size <= mb->stream_pos ||
-           ( Mb_flushing_or_end( mb ) && mb->pos < mb->stream_pos ) );
-  }
+static inline bool
+Mb_enough_available_bytes( const Matchfinder_base * const mb )
+  { return mb->pos + mb->after_size <= mb->stream_pos ||
+           ( Mb_flushing_or_end( mb ) && mb->pos < mb->stream_pos ); }
 
 static inline const uint8_t *
-Mb_ptr_to_current_pos( const struct Matchfinder_base * const mb )
+Mb_ptr_to_current_pos( const Matchfinder_base * const mb )
   { return mb->buffer + mb->pos; }
 
-static int Mb_write_data( struct Matchfinder_base * const mb,
+static int Mb_write_data( Matchfinder_base * const mb,
                           const uint8_t * const inbuf, const int size )
   {
   const int sz = min( mb->buffer_size - mb->stream_pos, size );
@@ -283,19 +293,17 @@ static int Mb_write_data( struct Matchfinder_base * const mb,
   return sz;
   }
 
-static inline int Mb_true_match_len( const struct Matchfinder_base * const mb,
-                                     const int index, const int distance,
-                                     int len_limit )
+static inline int Mb_true_match_len( const Matchfinder_base * const mb,
+                                     const int index, const int distance )
   {
-  const uint8_t * const data = mb->buffer + mb->pos + index;
-  int i = 0;
-  if( index + len_limit > Mb_available_bytes( mb ) )
-    len_limit = Mb_available_bytes( mb ) - index;
+  const uint8_t * const data = mb->buffer + mb->pos;
+  int i = index;
+  const int len_limit = min( Mb_available_bytes( mb ), max_match_len );
   while( i < len_limit && data[i-distance] == data[i] ) ++i;
   return i;
   }
 
-static inline bool Mb_move_pos( struct Matchfinder_base * const mb )
+static inline bool Mb_move_pos( Matchfinder_base * const mb )
   {
   if( ++mb->cyclic_pos > mb->dictionary_size ) mb->cyclic_pos = 0;
   if( ++mb->pos >= mb->pos_limit ) return Mb_normalize_pos( mb );
@@ -303,23 +311,23 @@ static inline bool Mb_move_pos( struct Matchfinder_base * const mb )
   }
 
 
-struct Range_encoder
+typedef struct Range_encoder
   {
-  struct Circular_buffer cb;
+  Circular_buffer cb;
   unsigned min_free_bytes;
   uint64_t low;
   unsigned long long partial_member_pos;
   uint32_t range;
   unsigned ff_count;
   uint8_t cache;
-  File_header header;
-  };
+  Lzip_header header;
+  } Range_encoder;
 
-static inline void Re_shift_low( struct Range_encoder * const renc )
+static inline void Re_shift_low( Range_encoder * const renc )
   {
-  const bool carry = ( renc->low > 0xFFFFFFFFU );
-  if( carry || renc->low < 0xFF000000U )
+  if( renc->low >> 24 != 0xFF )
     {
+    const bool carry = renc->low > 0xFFFFFFFFU;
     Cb_put_byte( &renc->cb, renc->cache + carry );
     for( ; renc->ff_count > 0; --renc->ff_count )
       Cb_put_byte( &renc->cb, 0xFF + carry );
@@ -329,42 +337,41 @@ static inline void Re_shift_low( struct Range_encoder * const renc )
   renc->low = ( renc->low & 0x00FFFFFFU ) << 8;
   }
 
-static inline void Re_reset( struct Range_encoder * const renc )
+static inline void Re_reset( Range_encoder * const renc,
+                             const unsigned dictionary_size )
   {
-  int i;
   Cb_reset( &renc->cb );
   renc->low = 0;
   renc->partial_member_pos = 0;
   renc->range = 0xFFFFFFFFU;
   renc->ff_count = 0;
   renc->cache = 0;
-  for( i = 0; i < Fh_size; ++i )
-    Cb_put_byte( &renc->cb, renc->header[i] );
+  Lh_set_dictionary_size( renc->header, dictionary_size );
+  int i; for( i = 0; i < Lh_size; ++i ) Cb_put_byte( &renc->cb, renc->header[i] );
   }
 
-static inline bool Re_init( struct Range_encoder * const renc,
+static inline bool Re_init( Range_encoder * const renc,
                             const unsigned dictionary_size,
                             const unsigned min_free_bytes )
   {
   if( !Cb_init( &renc->cb, 65536 + min_free_bytes ) ) return false;
   renc->min_free_bytes = min_free_bytes;
-  Fh_set_magic( renc->header );
-  Fh_set_dictionary_size( renc->header, dictionary_size );
-  Re_reset( renc );
+  Lh_set_magic( renc->header );
+  Re_reset( renc, dictionary_size );
   return true;
   }
 
-static inline void Re_free( struct Range_encoder * const renc )
+static inline void Re_free( Range_encoder * const renc )
   { Cb_free( &renc->cb ); }
 
 static inline unsigned long long
-Re_member_position( const struct Range_encoder * const renc )
+Re_member_position( const Range_encoder * const renc )
   { return renc->partial_member_pos + Cb_used_bytes( &renc->cb ) + renc->ff_count; }
 
-static inline bool Re_enough_free_bytes( const struct Range_encoder * const renc )
+static inline bool Re_enough_free_bytes( const Range_encoder * const renc )
   { return Cb_free_bytes( &renc->cb ) >= renc->min_free_bytes + renc->ff_count; }
 
-static inline int Re_read_data( struct Range_encoder * const renc,
+static inline int Re_read_data( Range_encoder * const renc,
                                 uint8_t * const out_buffer, const int out_size )
   {
   const int size = Cb_read_data( &renc->cb, out_buffer, out_size );
@@ -372,7 +379,7 @@ static inline int Re_read_data( struct Range_encoder * const renc,
   return size;
   }
 
-static inline void Re_flush( struct Range_encoder * const renc )
+static inline void Re_flush( Range_encoder * const renc )
   {
   int i; for( i = 0; i < 5; ++i ) Re_shift_low( renc );
   renc->low = 0;
@@ -381,21 +388,20 @@ static inline void Re_flush( struct Range_encoder * const renc )
   renc->cache = 0;
   }
 
-static inline void Re_encode( struct Range_encoder * const renc,
+static inline void Re_encode( Range_encoder * const renc,
                               const int symbol, const int num_bits )
   {
-  int i;
-  for( i = num_bits - 1; i >= 0; --i )
+  unsigned mask;
+  for( mask = 1 << ( num_bits - 1 ); mask > 0; mask >>= 1 )
     {
     renc->range >>= 1;
-    if( (symbol >> i) & 1 ) renc->low += renc->range;
-    if( renc->range <= 0x00FFFFFFU )
-      { renc->range <<= 8; Re_shift_low( renc ); }
+    if( symbol & mask ) renc->low += renc->range;
+    if( renc->range <= 0x00FFFFFFU ) { renc->range <<= 8; Re_shift_low( renc ); }
     }
   }
 
-static inline void Re_encode_bit( struct Range_encoder * const renc,
-                                  Bit_model * const probability, const int bit )
+static inline void Re_encode_bit( Range_encoder * const renc,
+                                  Bit_model * const probability, const bool bit )
   {
   const uint32_t bound = ( renc->range >> bit_model_total_bits ) * *probability;
   if( !bit )
@@ -409,76 +415,96 @@ static inline void Re_encode_bit( struct Range_encoder * const renc,
     renc->range -= bound;
     *probability -= *probability >> bit_model_move_bits;
     }
-  if( renc->range <= 0x00FFFFFFU )
-    { renc->range <<= 8; Re_shift_low( renc ); }
+  if( renc->range <= 0x00FFFFFFU ) { renc->range <<= 8; Re_shift_low( renc ); }
   }
 
-static inline void Re_encode_tree( struct Range_encoder * const renc,
-                                   Bit_model bm[], const int symbol, const int num_bits )
+static inline void Re_encode_tree3( Range_encoder * const renc,
+                                    Bit_model bm[], const int symbol )
+  {
+  bool bit = ( symbol >> 2 ) & 1;
+  Re_encode_bit( renc, &bm[1], bit );
+  int model = 2 | bit;
+  bit = ( symbol >> 1 ) & 1;
+  Re_encode_bit( renc, &bm[model], bit ); model <<= 1; model |= bit;
+  Re_encode_bit( renc, &bm[model], symbol & 1 );
+  }
+
+static inline void Re_encode_tree6( Range_encoder * const renc,
+                                    Bit_model bm[], const unsigned symbol )
+  {
+  bool bit = ( symbol >> 5 ) & 1;
+  Re_encode_bit( renc, &bm[1], bit );
+  int model = 2 | bit;
+  bit = ( symbol >> 4 ) & 1;
+  Re_encode_bit( renc, &bm[model], bit ); model <<= 1; model |= bit;
+  bit = ( symbol >> 3 ) & 1;
+  Re_encode_bit( renc, &bm[model], bit ); model <<= 1; model |= bit;
+  bit = ( symbol >> 2 ) & 1;
+  Re_encode_bit( renc, &bm[model], bit ); model <<= 1; model |= bit;
+  bit = ( symbol >> 1 ) & 1;
+  Re_encode_bit( renc, &bm[model], bit ); model <<= 1; model |= bit;
+  Re_encode_bit( renc, &bm[model], symbol & 1 );
+  }
+
+static inline void Re_encode_tree8( Range_encoder * const renc,
+                                    Bit_model bm[], const int symbol )
   {
-  int mask = ( 1 << ( num_bits - 1 ) );
   int model = 1;
   int i;
-  for( i = num_bits; i > 0; --i, mask >>= 1 )
+  for( i = 7; i >= 0; --i )
     {
-    const int bit = ( symbol & mask );
+    const bool bit = ( symbol >> i ) & 1;
     Re_encode_bit( renc, &bm[model], bit );
-    model <<= 1;
-    if( bit ) model |= 1;
+    model <<= 1; model |= bit;
     }
   }
 
-static inline void Re_encode_tree_reversed( struct Range_encoder * const renc,
-                                            Bit_model bm[], int symbol, const int num_bits )
+static inline void Re_encode_tree_reversed( Range_encoder * const renc,
+                     Bit_model bm[], int symbol, const int num_bits )
   {
   int model = 1;
   int i;
   for( i = num_bits; i > 0; --i )
     {
-    const int bit = symbol & 1;
-    Re_encode_bit( renc, &bm[model], bit );
-    model = ( model << 1 ) | bit;
+    const bool bit = symbol & 1;
     symbol >>= 1;
+    Re_encode_bit( renc, &bm[model], bit );
+    model <<= 1; model |= bit;
     }
   }
 
-static inline void Re_encode_matched( struct Range_encoder * const renc,
-                                      Bit_model bm[], int symbol,
-                                      int match_byte )
+static inline void Re_encode_matched( Range_encoder * const renc,
+                                      Bit_model bm[], unsigned symbol,
+                                      unsigned match_byte )
   {
-  int mask = 0x100;
+  unsigned mask = 0x100;
   symbol |= mask;
-
-  do {
-    int match_bit, bit;
-    match_byte <<= 1;
-    match_bit = match_byte & mask;
-    symbol <<= 1;
-    bit = symbol & 0x100;
-    Re_encode_bit( renc, &bm[match_bit+(symbol>>9)+mask], bit );
-    mask &= ~(match_byte ^ symbol);	/* if( match_bit != bit ) mask = 0; */
+  while( true )
+    {
+    const unsigned match_bit = ( match_byte <<= 1 ) & mask;
+    const bool bit = ( symbol <<= 1 ) & 0x100;
+    Re_encode_bit( renc, &bm[(symbol>>9)+match_bit+mask], bit );
+    if( symbol >= 0x10000 ) break;
+    mask &= ~(match_bit ^ symbol);	/* if( match_bit != bit ) mask = 0; */
     }
-  while( symbol < 0x10000 );
   }
 
-static inline void Re_encode_len( struct Range_encoder * const renc,
-                                  struct Len_model * const lm,
+static inline void Re_encode_len( Range_encoder * const renc,
+                                  Len_model * const lm,
                                   int symbol, const int pos_state )
   {
-  bool bit = ( ( symbol -= min_match_len ) >= len_low_symbols );
+  bool bit = ( symbol -= min_match_len ) >= len_low_symbols;
   Re_encode_bit( renc, &lm->choice1, bit );
   if( !bit )
-    Re_encode_tree( renc, lm->bm_low[pos_state], symbol, len_low_bits );
+    Re_encode_tree3( renc, lm->bm_low[pos_state], symbol );
   else
     {
-    bit = ( symbol >= len_low_symbols + len_mid_symbols );
+    bit = ( symbol -= len_low_symbols ) >= len_mid_symbols;
     Re_encode_bit( renc, &lm->choice2, bit );
     if( !bit )
-      Re_encode_tree( renc, lm->bm_mid[pos_state],
-                      symbol - len_low_symbols, len_mid_bits );
+      Re_encode_tree3( renc, lm->bm_mid[pos_state], symbol );
     else
-      Re_encode_tree( renc, lm->bm_high,
-                      symbol - len_low_symbols - len_mid_symbols, len_high_bits );
+      Re_encode_tree8( renc, lm->bm_high, symbol - len_mid_symbols );
     }
   }
 
@@ -486,9 +512,9 @@ static inline void Re_encode_len( struct Range_encoder * const renc,
 enum { max_marker_size = 16,
        num_rep_distances = 4 };		/* must be 4 */
 
-struct LZ_encoder_base
+typedef struct LZ_encoder_base
   {
-  struct Matchfinder_base mb;
+  Matchfinder_base mb;
   unsigned long long member_size_limit;
   uint32_t crc;
 
@@ -500,28 +526,28 @@ struct LZ_encoder_base
   Bit_model bm_rep2[states];
   Bit_model bm_len[states][pos_states];
   Bit_model bm_dis_slot[len_states][1<<dis_slot_bits];
-  Bit_model bm_dis[modeled_distances-end_dis_model];
+  Bit_model bm_dis[modeled_distances-end_dis_model+1];
   Bit_model bm_align[dis_align_size];
-  struct Len_model match_len_model;
-  struct Len_model rep_len_model;
-  struct Range_encoder renc;
+  Len_model match_len_model;
+  Len_model rep_len_model;
+  Range_encoder renc;
   int reps[num_rep_distances];
   State state;
   bool member_finished;
-  };
+  } LZ_encoder_base;
 
-static void LZeb_reset( struct LZ_encoder_base * const eb,
+static void LZeb_reset( LZ_encoder_base * const eb,
                         const unsigned long long member_size );
 
-static inline bool LZeb_init( struct LZ_encoder_base * const eb,
-                              const int before, const int dict_size,
+static inline bool LZeb_init( LZ_encoder_base * const eb,
+                              const int before_size, const int dict_size,
                               const int after_size, const int dict_factor,
                               const int num_prev_positions23,
                               const int pos_array_factor,
                               const unsigned min_free_bytes,
                               const unsigned long long member_size )
   {
-  if( !Mb_init( &eb->mb, before, dict_size, after_size, dict_factor,
+  if( !Mb_init( &eb->mb, before_size, dict_size, after_size, dict_factor,
                 num_prev_positions23, pos_array_factor ) ) return false;
   if( !Re_init( &eb->renc, eb->mb.dictionary_size, min_free_bytes ) )
     return false;
@@ -529,44 +555,40 @@ static inline bool LZeb_init( struct LZ_encoder_base * const eb,
   return true;
   }
 
-static inline bool LZeb_member_finished( const struct LZ_encoder_base * const eb )
-  { return ( eb->member_finished && !Cb_used_bytes( &eb->renc.cb ) ); }
+static inline bool LZeb_member_finished( const LZ_encoder_base * const eb )
+  { return eb->member_finished && Cb_empty( &eb->renc.cb ); }
 
-static inline void LZeb_free( struct LZ_encoder_base * const eb )
+static inline void LZeb_free( LZ_encoder_base * const eb )
   { Re_free( &eb->renc ); Mb_free( &eb->mb ); }
 
-static inline unsigned LZeb_crc( const struct LZ_encoder_base * const eb )
+static inline unsigned LZeb_crc( const LZ_encoder_base * const eb )
   { return eb->crc ^ 0xFFFFFFFFU; }
 
-static inline int LZeb_price_literal( const struct LZ_encoder_base * const eb,
-                                      uint8_t prev_byte, uint8_t symbol )
-  { return price_symbol( eb->bm_literal[get_lit_state(prev_byte)], symbol, 8 ); }
+static inline int LZeb_price_literal( const LZ_encoder_base * const eb,
+                            const uint8_t prev_byte, const uint8_t symbol )
+  { return price_symbol8( eb->bm_literal[get_lit_state(prev_byte)], symbol ); }
 
-static inline int LZeb_price_matched( const struct LZ_encoder_base * const eb,
-                                      uint8_t prev_byte, uint8_t symbol,
-                                      uint8_t match_byte )
+static inline int LZeb_price_matched( const LZ_encoder_base * const eb,
+  const uint8_t prev_byte, const uint8_t symbol, const uint8_t match_byte )
   { return price_matched( eb->bm_literal[get_lit_state(prev_byte)], symbol,
                           match_byte ); }
 
-static inline void LZeb_encode_literal( struct LZ_encoder_base * const eb,
-                                        uint8_t prev_byte, uint8_t symbol )
-  { Re_encode_tree( &eb->renc,
-                    eb->bm_literal[get_lit_state(prev_byte)], symbol, 8 ); }
+static inline void LZeb_encode_literal( LZ_encoder_base * const eb,
+                            const uint8_t prev_byte, const uint8_t symbol )
+  { Re_encode_tree8( &eb->renc, eb->bm_literal[get_lit_state(prev_byte)], symbol ); }
 
-static inline void LZeb_encode_matched( struct LZ_encoder_base * const eb,
-                                        uint8_t prev_byte, uint8_t symbol,
-                                        uint8_t match_byte )
+static inline void LZeb_encode_matched( LZ_encoder_base * const eb,
+  const uint8_t prev_byte, const uint8_t symbol, const uint8_t match_byte )
   { Re_encode_matched( &eb->renc, eb->bm_literal[get_lit_state(prev_byte)],
                        symbol, match_byte ); }
 
-static inline void LZeb_encode_pair( struct LZ_encoder_base * const eb,
+static inline void LZeb_encode_pair( LZ_encoder_base * const eb,
                                      const unsigned dis, const int len,
                                      const int pos_state )
   {
-  const int dis_slot = get_slot( dis );
   Re_encode_len( &eb->renc, &eb->match_len_model, len, pos_state );
-  Re_encode_tree( &eb->renc, eb->bm_dis_slot[get_len_state(len)], dis_slot,
-                  dis_slot_bits );
+  const unsigned dis_slot = get_slot( dis );
+  Re_encode_tree6( &eb->renc, eb->bm_dis_slot[get_len_state(len)], dis_slot );
 
   if( dis_slot >= start_dis_model )
     {
@@ -575,7 +597,7 @@ static inline void LZeb_encode_pair( struct LZ_encoder_base * const eb,
     const unsigned direct_dis = dis - base;
 
     if( dis_slot < end_dis_model )
-      Re_encode_tree_reversed( &eb->renc, eb->bm_dis + base - dis_slot - 1,
+      Re_encode_tree_reversed( &eb->renc, eb->bm_dis + ( base - dis_slot ),
                                direct_dis, direct_bits );
     else
       {

fast_encoder.c

@@ -1,99 +1,79 @@
-/*  Lzlib - Compression library for the lzip format
-    Copyright (C) 2009-2016 Antonio Diaz Diaz.
+/* Lzlib - Compression library for the lzip format
+   Copyright (C) 2009-2025 Antonio Diaz Diaz.
 
-    This library is free software: you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation, either version 2 of the License, or
-    (at your option) any later version.
+   This library is free software. Redistribution and use in source and
+   binary forms, with or without modification, are permitted provided
+   that the following conditions are met:
 
-    This library is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
+   1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions, and the following disclaimer.
 
-    You should have received a copy of the GNU General Public License
-    along with this library.  If not, see <http://www.gnu.org/licenses/>.
+   2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions, and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
 
-    As a special exception, you may use this file as part of a free
-    software library without restriction.  Specifically, if other files
-    instantiate templates or use macros or inline functions from this
-    file, or you compile this file and link it with other files to
-    produce an executable, this file does not by itself cause the
-    resulting executable to be covered by the GNU General Public
-    License.  This exception does not however invalidate any other
-    reasons why the executable file might be covered by the GNU General
-    Public License.
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 */
 
-int FLZe_longest_match_len( struct FLZ_encoder * const fe, int * const distance )
+static int FLZe_longest_match_len( FLZ_encoder * const fe, int * const distance )
   {
   enum { len_limit = 16 };
-  const uint8_t * const data = Mb_ptr_to_current_pos( &fe->eb.mb );
   int32_t * ptr0 = fe->eb.mb.pos_array + fe->eb.mb.cyclic_pos;
-  int32_t * newptr;
-  const int pos1 = fe->eb.mb.pos + 1;
-  int maxlen = 0;
-  int count, delta, newpos;
-  if( len_limit > Mb_available_bytes( &fe->eb.mb ) ) { *ptr0 = 0; return 0; }
+  const int available = min( Mb_available_bytes( &fe->eb.mb ), max_match_len );
+  if( available < len_limit ) { *ptr0 = 0; return 0; }
 
+  const uint8_t * const data = Mb_ptr_to_current_pos( &fe->eb.mb );
   fe->key4 = ( ( fe->key4 << 4 ) ^ data[3] ) & fe->eb.mb.key4_mask;
-  newpos = fe->eb.mb.prev_positions[fe->key4];
+  const int pos1 = fe->eb.mb.pos + 1;
+  int newpos1 = fe->eb.mb.prev_positions[fe->key4];
   fe->eb.mb.prev_positions[fe->key4] = pos1;
+  int maxlen = 0, count;
 
   for( count = 4; ; )
     {
-    if( --count < 0 || newpos <= 0 ) { *ptr0 = 0; break; }
-    delta = pos1 - newpos;
-    if( delta > fe->eb.mb.dictionary_size ) { *ptr0 = 0; break; }
-    newptr = fe->eb.mb.pos_array +
+    int delta;
+    if( newpos1 <= 0 || --count < 0 ||
+        ( delta = pos1 - newpos1 ) > fe->eb.mb.dictionary_size )
+      { *ptr0 = 0; break; }
+    int32_t * const newptr = fe->eb.mb.pos_array +
       ( fe->eb.mb.cyclic_pos - delta +
         ( ( fe->eb.mb.cyclic_pos >= delta ) ? 0 : fe->eb.mb.dictionary_size + 1 ) );
 
     if( data[maxlen-delta] == data[maxlen] )
       {
       int len = 0;
-      while( len < len_limit && data[len-delta] == data[len] ) ++len;
-      if( maxlen < len ) { maxlen = len; *distance = delta - 1; }
+      while( len < available && data[len-delta] == data[len] ) ++len;
+      if( maxlen < len )
+        { maxlen = len; *distance = delta - 1;
+          if( maxlen >= len_limit ) { *ptr0 = *newptr; break; } }
       }
 
-    if( maxlen < len_limit )
-      {
-      *ptr0 = newpos;
-      ptr0 = newptr;
-      newpos = *ptr0;
-      }
-    else
-      {
-      *ptr0 = *newptr;
-      maxlen += Mb_true_match_len( &fe->eb.mb, maxlen, *distance + 1,
-                                   max_match_len - maxlen );
-      break;
-      }
+    *ptr0 = newpos1;
+    ptr0 = newptr;
+    newpos1 = *ptr0;
     }
   return maxlen;
   }
 
 
-bool FLZe_encode_member( struct FLZ_encoder * const fe )
+static bool FLZe_encode_member( FLZ_encoder * const fe )
   {
   int rep = 0, i;
   State * const state = &fe->eb.state;
 
   if( fe->eb.member_finished ) return true;
   if( Re_member_position( &fe->eb.renc ) >= fe->eb.member_size_limit )
-    {
-    if( LZeb_full_flush( &fe->eb ) ) fe->eb.member_finished = true;
-    return true;
-    }
+    { LZeb_try_full_flush( &fe->eb ); return true; }
 
   if( Mb_data_position( &fe->eb.mb ) == 0 &&
       !Mb_data_finished( &fe->eb.mb ) )		/* encode first byte */
     {
-    const uint8_t prev_byte = 0;
-    uint8_t cur_byte;
     if( !Mb_enough_available_bytes( &fe->eb.mb ) ||
         !Re_enough_free_bytes( &fe->eb.renc ) ) return true;
-    cur_byte = Mb_peek( &fe->eb.mb, 0 );
+    const uint8_t prev_byte = 0;
+    const uint8_t cur_byte = Mb_peek( &fe->eb.mb, 0 );
     Re_encode_bit( &fe->eb.renc, &fe->eb.bm_match[*state][0], 0 );
     LZeb_encode_literal( &fe->eb, prev_byte, cur_byte );
     CRC32_update_byte( &fe->eb.crc, cur_byte );
@@ -104,17 +84,16 @@ bool FLZe_encode_member( struct FLZ_encoder * const fe )
   while( !Mb_data_finished( &fe->eb.mb ) &&
          Re_member_position( &fe->eb.renc ) < fe->eb.member_size_limit )
     {
-    int match_distance;
-    int main_len, pos_state, len = 0;
     if( !Mb_enough_available_bytes( &fe->eb.mb ) ||
         !Re_enough_free_bytes( &fe->eb.renc ) ) return true;
-    main_len = FLZe_longest_match_len( fe, &match_distance );
-    pos_state = Mb_data_position( &fe->eb.mb ) & pos_state_mask;
+    int match_distance = 0;		/* avoid warning from gcc 6.1.0 */
+    const int main_len = FLZe_longest_match_len( fe, &match_distance );
+    const int pos_state = Mb_data_position( &fe->eb.mb ) & pos_state_mask;
+    int len = 0;
 
     for( i = 0; i < num_rep_distances; ++i )
       {
-      const int tlen = Mb_true_match_len( &fe->eb.mb, 0,
-                                          fe->eb.reps[i] + 1, max_match_len );
+      const int tlen = Mb_true_match_len( &fe->eb.mb, 0, fe->eb.reps[i] + 1 );
       if( tlen > len ) { len = tlen; rep = i; }
       }
     if( len > min_match_len && len + 3 > main_len )
@@ -127,11 +106,10 @@ bool FLZe_encode_member( struct FLZ_encoder * const fe )
         Re_encode_bit( &fe->eb.renc, &fe->eb.bm_len[*state][pos_state], 1 );
       else
         {
-        int distance;
         Re_encode_bit( &fe->eb.renc, &fe->eb.bm_rep1[*state], rep > 1 );
         if( rep > 1 )
           Re_encode_bit( &fe->eb.renc, &fe->eb.bm_rep2[*state], rep > 2 );
-        distance = fe->eb.reps[rep];
+        const int distance = fe->eb.reps[rep];
         for( i = rep; i > 0; --i ) fe->eb.reps[i] = fe->eb.reps[i-1];
         fe->eb.reps[0] = distance;
         }
@@ -156,7 +134,6 @@ bool FLZe_encode_member( struct FLZ_encoder * const fe )
       continue;
       }
 
-    {
     const uint8_t prev_byte = Mb_peek( &fe->eb.mb, 1 );
     const uint8_t cur_byte = Mb_peek( &fe->eb.mb, 0 );
     const uint8_t match_byte = Mb_peek( &fe->eb.mb, fe->eb.reps[0] + 1 );
@@ -165,36 +142,34 @@ bool FLZe_encode_member( struct FLZ_encoder * const fe )
 
     if( match_byte == cur_byte )
       {
-      const int short_rep_price = price1( fe->eb.bm_match[*state][pos_state] ) +
-                                  price1( fe->eb.bm_rep[*state] ) +
-                                  price0( fe->eb.bm_rep0[*state] ) +
-                                  price0( fe->eb.bm_len[*state][pos_state] );
+      const int shortrep_price = price1( fe->eb.bm_match[*state][pos_state] ) +
+                                 price1( fe->eb.bm_rep[*state] ) +
+                                 price0( fe->eb.bm_rep0[*state] ) +
+                                 price0( fe->eb.bm_len[*state][pos_state] );
       int price = price0( fe->eb.bm_match[*state][pos_state] );
       if( St_is_char( *state ) )
         price += LZeb_price_literal( &fe->eb, prev_byte, cur_byte );
       else
         price += LZeb_price_matched( &fe->eb, prev_byte, cur_byte, match_byte );
-      if( short_rep_price < price )
+      if( shortrep_price < price )
         {
         Re_encode_bit( &fe->eb.renc, &fe->eb.bm_match[*state][pos_state], 1 );
         Re_encode_bit( &fe->eb.renc, &fe->eb.bm_rep[*state], 1 );
         Re_encode_bit( &fe->eb.renc, &fe->eb.bm_rep0[*state], 0 );
         Re_encode_bit( &fe->eb.renc, &fe->eb.bm_len[*state][pos_state], 0 );
-        *state = St_set_short_rep( *state );
+        *state = St_set_shortrep( *state );
         continue;
         }
       }
 
     /* literal byte */
     Re_encode_bit( &fe->eb.renc, &fe->eb.bm_match[*state][pos_state], 0 );
-    if( St_is_char( *state ) )
+    if( ( *state = St_set_char( *state ) ) < 4 )
       LZeb_encode_literal( &fe->eb, prev_byte, cur_byte );
     else
       LZeb_encode_matched( &fe->eb, prev_byte, cur_byte, match_byte );
-    *state = St_set_char( *state );
-    }
     }
 
-  if( LZeb_full_flush( &fe->eb ) ) fe->eb.member_finished = true;
+  LZeb_try_full_flush( &fe->eb );
   return true;
   }

fast_encoder.h

@@ -1,37 +1,29 @@
-/*  Lzlib - Compression library for the lzip format
-    Copyright (C) 2009-2016 Antonio Diaz Diaz.
+/* Lzlib - Compression library for the lzip format
+   Copyright (C) 2009-2025 Antonio Diaz Diaz.
 
-    This library is free software: you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation, either version 2 of the License, or
-    (at your option) any later version.
+   This library is free software. Redistribution and use in source and
+   binary forms, with or without modification, are permitted provided
+   that the following conditions are met:
 
-    This library is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
+   1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions, and the following disclaimer.
 
-    You should have received a copy of the GNU General Public License
-    along with this library.  If not, see <http://www.gnu.org/licenses/>.
+   2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions, and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
 
-    As a special exception, you may use this file as part of a free
-    software library without restriction.  Specifically, if other files
-    instantiate templates or use macros or inline functions from this
-    file, or you compile this file and link it with other files to
-    produce an executable, this file does not by itself cause the
-    resulting executable to be covered by the GNU General Public
-    License.  This exception does not however invalidate any other
-    reasons why the executable file might be covered by the GNU General
-    Public License.
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 */
 
-struct FLZ_encoder
+typedef struct FLZ_encoder
   {
-  struct LZ_encoder_base eb;
-  int key4;			/* key made from latest 4 bytes */
-  };
+  LZ_encoder_base eb;
+  unsigned key4;			/* key made from latest 4 bytes */
+  } FLZ_encoder;
 
-static inline void FLZe_reset_key4( struct FLZ_encoder * const fe )
+static inline void FLZe_reset_key4( FLZ_encoder * const fe )
   {
   int i;
   fe->key4 = 0;
@@ -39,44 +31,40 @@ static inline void FLZe_reset_key4( struct FLZ_encoder * const fe )
     fe->key4 = ( fe->key4 << 4 ) ^ fe->eb.mb.buffer[i];
   }
 
-int FLZe_longest_match_len( struct FLZ_encoder * const fe, int * const distance );
-
-static inline bool FLZe_update_and_move( struct FLZ_encoder * const fe, int n )
+static inline bool FLZe_update_and_move( FLZ_encoder * const fe, int n )
   {
+  Matchfinder_base * const mb = &fe->eb.mb;
   while( --n >= 0 )
     {
-    if( Mb_available_bytes( &fe->eb.mb ) >= 4 )
+    if( Mb_available_bytes( mb ) >= 4 )
       {
-      int newpos;
-      fe->key4 = ( ( fe->key4 << 4 ) ^ fe->eb.mb.buffer[fe->eb.mb.pos+3] ) &
-                 fe->eb.mb.key4_mask;
-      newpos = fe->eb.mb.prev_positions[fe->key4];
-      fe->eb.mb.prev_positions[fe->key4] = fe->eb.mb.pos + 1;
-      fe->eb.mb.pos_array[fe->eb.mb.cyclic_pos] = newpos;
+      fe->key4 = ( ( fe->key4 << 4 ) ^ mb->buffer[mb->pos+3] ) & mb->key4_mask;
+      mb->pos_array[mb->cyclic_pos] = mb->prev_positions[fe->key4];
+      mb->prev_positions[fe->key4] = mb->pos + 1;
       }
-    else fe->eb.mb.pos_array[fe->eb.mb.cyclic_pos] = 0;
-    if( !Mb_move_pos( &fe->eb.mb ) ) return false;
+    else mb->pos_array[mb->cyclic_pos] = 0;
+    if( !Mb_move_pos( mb ) ) return false;
     }
   return true;
   }
 
-static inline bool FLZe_init( struct FLZ_encoder * const fe,
+static inline bool FLZe_init( FLZ_encoder * const fe,
                               const unsigned long long member_size )
   {
-  enum { before = 0,
+  enum { before_size = 0,
          dict_size = 65536,
          /* bytes to keep in buffer after pos */
          after_size = max_match_len,
          dict_factor = 16,
+         min_free_bytes = max_marker_size,
          num_prev_positions23 = 0,
-         pos_array_factor = 1,
-         min_free_bytes = max_marker_size };
+         pos_array_factor = 1 };
 
-  return LZeb_init( &fe->eb, before, dict_size, after_size, dict_factor,
+  return LZeb_init( &fe->eb, before_size, dict_size, after_size, dict_factor,
                     num_prev_positions23, pos_array_factor, min_free_bytes,
                     member_size );
   }
 
-static inline void FLZe_reset( struct FLZ_encoder * const fe,
+static inline void FLZe_reset( FLZ_encoder * const fe,
                                const unsigned long long member_size )
   { LZeb_reset( &fe->eb, member_size ); }

ffexample.c

@@ -0,0 +1,298 @@
+/* File to file example - Test program for the library lzlib
+   Copyright (C) 2010-2025 Antonio Diaz Diaz.
+
+   This program is free software: you have unlimited permission
+   to copy, distribute, and modify it.
+
+   Try 'ffexample -h' for usage information.
+
+   This program is an example of how file-to-file
+   compression/decompression can be implemented using lzlib.
+*/
+
+#define _FILE_OFFSET_BITS 64
+
+#include <errno.h>
+#include <limits.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#if defined __MSVCRT__ || defined __OS2__ || defined __DJGPP__
+#include <fcntl.h>
+#include <io.h>
+#endif
+
+#include "lzlib.h"
+
+#ifndef min
+  #define min(x,y) ((x) <= (y) ? (x) : (y))
+#endif
+
+
+static void show_help( void )
+  {
+  printf( "ffexample is an example program showing how file-to-file (de)compression can\n"
+          "be implemented using lzlib. The content of infile is compressed,\n"
+          "decompressed, or both, and then written to outfile.\n"
+          "\nUsage: ffexample operation [infile [outfile]]\n" );
+  printf( "\nOperation:\n"
+          "  -h        display this help and exit\n"
+          "  -c        compress infile to outfile\n"
+          "  -d        decompress infile to outfile\n"
+          "  -b        both (compress then decompress) infile to outfile\n"
+          "  -m        compress (multimember) infile to outfile\n"
+          "  -l        compress (1 member per line) infile to outfile\n"
+          "  -r        decompress with resync if data error or leading garbage\n"
+          "\nIf infile or outfile are omitted, or are specified as '-', standard input or\n"
+          "standard output are used in their place respectively.\n"
+          "\nReport bugs to lzip-bug@nongnu.org\n"
+          "Lzlib home page: http://www.nongnu.org/lzip/lzlib.html\n" );
+  }
+
+
+int ffcompress( LZ_Encoder * const encoder,
+                FILE * const infile, FILE * const outfile )
+  {
+  enum { buffer_size = 16384 };
+  uint8_t buffer[buffer_size];
+  while( true )
+    {
+    int len, ret;
+    int size = min( buffer_size, LZ_compress_write_size( encoder ) );
+    if( size > 0 )
+      {
+      len = fread( buffer, 1, size, infile );
+      ret = LZ_compress_write( encoder, buffer, len );
+      if( ret < 0 || ferror( infile ) ) break;
+      if( feof( infile ) ) LZ_compress_finish( encoder );
+      }
+    ret = LZ_compress_read( encoder, buffer, buffer_size );
+    if( ret < 0 ) break;
+    len = fwrite( buffer, 1, ret, outfile );
+    if( len < ret ) break;
+    if( LZ_compress_finished( encoder ) == 1 ) return 0;
+    }
+  return 1;
+  }
+
+
+int ffdecompress( LZ_Decoder * const decoder,
+                  FILE * const infile, FILE * const outfile )
+  {
+  enum { buffer_size = 16384 };
+  uint8_t buffer[buffer_size];
+  while( true )
+    {
+    int len, ret;
+    int size = min( buffer_size, LZ_decompress_write_size( decoder ) );
+    if( size > 0 )
+      {
+      len = fread( buffer, 1, size, infile );
+      ret = LZ_decompress_write( decoder, buffer, len );
+      if( ret < 0 || ferror( infile ) ) break;
+      if( feof( infile ) ) LZ_decompress_finish( decoder );
+      }
+    ret = LZ_decompress_read( decoder, buffer, buffer_size );
+    if( ret < 0 ) break;
+    len = fwrite( buffer, 1, ret, outfile );
+    if( len < ret ) break;
+    if( LZ_decompress_finished( decoder ) == 1 ) return 0;
+    }
+  return 1;
+  }
+
+
+int ffboth( LZ_Encoder * const encoder, LZ_Decoder * const decoder,
+            FILE * const infile, FILE * const outfile )
+  {
+  enum { buffer_size = 16384 };
+  uint8_t buffer[buffer_size];
+  while( true )
+    {
+    int len, ret;
+    int size = min( buffer_size, LZ_compress_write_size( encoder ) );
+    if( size > 0 )
+      {
+      len = fread( buffer, 1, size, infile );
+      ret = LZ_compress_write( encoder, buffer, len );
+      if( ret < 0 || ferror( infile ) ) break;
+      if( feof( infile ) ) LZ_compress_finish( encoder );
+      }
+    size = min( buffer_size, LZ_decompress_write_size( decoder ) );
+    if( size > 0 )
+      {
+      ret = LZ_compress_read( encoder, buffer, size );
+      if( ret < 0 ) break;
+      ret = LZ_decompress_write( decoder, buffer, ret );
+      if( ret < 0 ) break;
+      if( LZ_compress_finished( encoder ) == 1 )
+        LZ_decompress_finish( decoder );
+      }
+    ret = LZ_decompress_read( decoder, buffer, buffer_size );
+    if( ret < 0 ) break;
+    len = fwrite( buffer, 1, ret, outfile );
+    if( len < ret ) break;
+    if( LZ_decompress_finished( decoder ) == 1 ) return 0;
+    }
+  return 1;
+  }
+
+
+int ffmmcompress( FILE * const infile, FILE * const outfile )
+  {
+  enum { buffer_size = 16384, member_size = 4096 };
+  uint8_t buffer[buffer_size];
+  bool done = false;
+  LZ_Encoder * const encoder = LZ_compress_open( 65535, 16, member_size );
+  if( !encoder || LZ_compress_errno( encoder ) != LZ_ok  )
+    { fputs( "ffexample: Not enough memory.\n", stderr );
+      LZ_compress_close( encoder ); return 1; }
+  while( true )
+    {
+    int len, ret;
+    int size = min( buffer_size, LZ_compress_write_size( encoder ) );
+    if( size > 0 )
+      {
+      len = fread( buffer, 1, size, infile );
+      ret = LZ_compress_write( encoder, buffer, len );
+      if( ret < 0 || ferror( infile ) ) break;
+      if( feof( infile ) ) LZ_compress_finish( encoder );
+      }
+    ret = LZ_compress_read( encoder, buffer, buffer_size );
+    if( ret < 0 ) break;
+    len = fwrite( buffer, 1, ret, outfile );
+    if( len < ret ) break;
+    if( LZ_compress_member_finished( encoder ) == 1 )
+      {
+      if( LZ_compress_finished( encoder ) == 1 ) { done = true; break; }
+      if( LZ_compress_restart_member( encoder, member_size ) < 0 ) break;
+      }
+    }
+  if( LZ_compress_close( encoder ) < 0 ) done = false;
+  return done;
+  }
+
+
+/* Compress 'infile' to 'outfile' as a multimember stream with one member
+   for each line of text terminated by a newline character or by EOF.
+   Return 0 if success, 1 if error.
+*/
+int fflfcompress( LZ_Encoder * const encoder,
+                  FILE * const infile, FILE * const outfile )
+  {
+  enum { buffer_size = 16384 };
+  uint8_t buffer[buffer_size];
+  while( true )
+    {
+    int len, ret;
+    int size = min( buffer_size, LZ_compress_write_size( encoder ) );
+    if( size > 0 )
+      {
+      for( len = 0; len < size; )
+        {
+        int ch = getc( infile );
+        if( ch == EOF || ( buffer[len++] = ch ) == '\n' ) break;
+        }
+      /* avoid writing an empty member to outfile */
+      if( len == 0 && LZ_compress_data_position( encoder ) == 0 ) return 0;
+      ret = LZ_compress_write( encoder, buffer, len );
+      if( ret < 0 || ferror( infile ) ) break;
+      if( feof( infile ) || buffer[len-1] == '\n' )
+        LZ_compress_finish( encoder );
+      }
+    ret = LZ_compress_read( encoder, buffer, buffer_size );
+    if( ret < 0 ) break;
+    len = fwrite( buffer, 1, ret, outfile );
+    if( len < ret ) break;
+    if( LZ_compress_member_finished( encoder ) == 1 )
+      {
+      if( feof( infile ) && LZ_compress_finished( encoder ) == 1 ) return 0;
+      if( LZ_compress_restart_member( encoder, INT64_MAX ) < 0 ) break;
+      }
+    }
+  return 1;
+  }
+
+
+/* Decompress 'infile' to 'outfile' with automatic resynchronization to
+   next member in case of data error, including the automatic removal of
+   leading garbage.
+*/
+int ffrsdecompress( LZ_Decoder * const decoder,
+                    FILE * const infile, FILE * const outfile )
+  {
+  enum { buffer_size = 16384 };
+  uint8_t buffer[buffer_size];
+  while( true )
+    {
+    int len, ret;
+    int size = min( buffer_size, LZ_decompress_write_size( decoder ) );
+    if( size > 0 )
+      {
+      len = fread( buffer, 1, size, infile );
+      ret = LZ_decompress_write( decoder, buffer, len );
+      if( ret < 0 || ferror( infile ) ) break;
+      if( feof( infile ) ) LZ_decompress_finish( decoder );
+      }
+    ret = LZ_decompress_read( decoder, buffer, buffer_size );
+    if( ret < 0 )
+      {
+      if( LZ_decompress_errno( decoder ) == LZ_header_error ||
+          LZ_decompress_errno( decoder ) == LZ_data_error )
+        { LZ_decompress_sync_to_member( decoder ); continue; }
+      break;
+      }
+    len = fwrite( buffer, 1, ret, outfile );
+    if( len < ret ) break;
+    if( LZ_decompress_finished( decoder ) == 1 ) return 0;
+    }
+  return 1;
+  }
+
+
+int main( const int argc, const char * const argv[] )
+  {
+#if defined __MSVCRT__ || defined __OS2__ || defined __DJGPP__
+  setmode( STDIN_FILENO, O_BINARY );
+  setmode( STDOUT_FILENO, O_BINARY );
+#endif
+
+  LZ_Encoder * const encoder = LZ_compress_open( 65535, 16, INT64_MAX );
+  LZ_Decoder * const decoder = LZ_decompress_open();
+  FILE * const infile = (argc >= 3 && strcmp( argv[2], "-" ) != 0) ?
+                        fopen( argv[2], "rb" ) : stdin;
+  FILE * const outfile = (argc >= 4 && strcmp( argv[3], "-" ) != 0) ?
+                         fopen( argv[3], "wb" ) : stdout;
+  int retval;
+
+  if( argc < 2 || argc > 4 || strlen( argv[1] ) != 2 || argv[1][0] != '-' )
+    { show_help(); return 1; }
+  if( !encoder || LZ_compress_errno( encoder ) != LZ_ok ||
+      !decoder || LZ_decompress_errno( decoder ) != LZ_ok )
+    { fputs( "ffexample: Not enough memory.\n", stderr );
+      LZ_compress_close( encoder ); LZ_decompress_close( decoder ); return 1; }
+  if( !infile )
+    { fprintf( stderr, "ffexample: %s: Can't open input file: %s\n",
+               argv[2], strerror( errno ) ); return 1; }
+  if( !outfile )
+    { fprintf( stderr, "ffexample: %s: Can't open output file: %s\n",
+               argv[3], strerror( errno ) ); return 1; }
+
+  switch( argv[1][1] )
+    {
+    case 'c': retval = ffcompress( encoder, infile, outfile ); break;
+    case 'd': retval = ffdecompress( decoder, infile, outfile ); break;
+    case 'b': retval = ffboth( encoder, decoder, infile, outfile ); break;
+    case 'm': retval = ffmmcompress( infile, outfile ); break;
+    case 'l': retval = fflfcompress( encoder, infile, outfile ); break;
+    case 'r': retval = ffrsdecompress( decoder, infile, outfile ); break;
+    default: show_help(); return argv[1][1] != 'h';
+    }
+
+  if( LZ_decompress_close( decoder ) < 0 || LZ_compress_close( encoder ) < 0 ||
+      fclose( outfile ) != 0 || fclose( infile ) != 0 ) retval = 1;
+  return retval;
+  }

lzcheck.c

@@ -1,239 +1,398 @@
-/*  Lzcheck - Test program for the lzlib library
-    Copyright (C) 2009-2016 Antonio Diaz Diaz.
+/* Lzcheck - Test program for the library lzlib
+   Copyright (C) 2009-2025 Antonio Diaz Diaz.
 
-    This program is free software: you have unlimited permission
-    to copy, distribute and modify it.
+   This program is free software: you have unlimited permission
+   to copy, distribute, and modify it.
 
-    Usage is:
-      lzcheck filename.txt
+   Usage: lzcheck [-m|-s] filename.txt...
 
-    This program reads the specified text file and then compresses it,
-    line by line, to test the flushing mechanism and the member
-    restart/reset/sync functions.
+   This program reads each text file specified and then compresses it,
+   line by line, to test the flushing mechanism and the member
+   restart/reset/sync functions.
 */
 
 #define _FILE_OFFSET_BITS 64
 
+#include <ctype.h>
 #include <stdbool.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <sys/stat.h>
 
 #include "lzlib.h"
 
-#ifndef min
-  #define min(x,y) ((x) <= (y) ? (x) : (y))
-#endif
 
-
-enum { buffer_size = 32768 };
+const unsigned long long member_size = INT64_MAX;
+enum { buffer_size = 32749 };			/* largest prime < 32768 */
 uint8_t in_buffer[buffer_size];
 uint8_t mid_buffer[buffer_size];
 uint8_t out_buffer[buffer_size];
 
 
-int lzcheck( FILE * const file, const int dictionary_size )
+static void show_line( const uint8_t * const buffer, const int size )
+  {
+  int i;
+  for( i = 0; i < size; ++i )
+    fputc( isprint( buffer[i] ) ? buffer[i] : '.', stderr );
+  fputc( '\n', stderr );
+  }
+
+
+static LZ_Encoder * xopen_encoder( const int dictionary_size )
   {
   const int match_len_limit = 16;
-  const unsigned long long member_size = 0x7FFFFFFFFFFFFFFFULL;	/* INT64_MAX */
-  struct LZ_Encoder * encoder;
-  struct LZ_Decoder * decoder;
-  int retval = 0;
-
-  encoder = LZ_compress_open( dictionary_size, match_len_limit, member_size );
+  LZ_Encoder * const encoder =
+    LZ_compress_open( dictionary_size, match_len_limit, member_size );
   if( !encoder || LZ_compress_errno( encoder ) != LZ_ok )
     {
-    const bool mem_error = ( LZ_compress_errno( encoder ) == LZ_mem_error );
+    const bool bad_arg =
+      encoder && ( LZ_compress_errno( encoder ) == LZ_bad_argument );
     LZ_compress_close( encoder );
-    if( mem_error )
+    if( bad_arg )
       {
-      fputs( "lzcheck: Not enough memory.\n", stderr );
-      return 1;
+      fputs( "lzcheck: internal error: Invalid argument to encoder.\n", stderr );
+      exit( 3 );
       }
-    fputs( "lzcheck: internal error: Invalid argument to encoder.\n", stderr );
-    return 3;
+    fputs( "lzcheck: Not enough memory.\n", stderr );
+    exit( 1 );
     }
+  return encoder;
+  }
 
-  decoder = LZ_decompress_open();
+
+static LZ_Decoder * xopen_decoder( void )
+  {
+  LZ_Decoder * const decoder = LZ_decompress_open();
   if( !decoder || LZ_decompress_errno( decoder ) != LZ_ok )
     {
     LZ_decompress_close( decoder );
     fputs( "lzcheck: Not enough memory.\n", stderr );
-    return 1;
+    exit( 1 );
+    }
+  return decoder;
+  }
+
+
+static void xclose_encoder( LZ_Encoder * const encoder, const bool finish )
+  {
+  if( finish )
+    {
+    unsigned long long size = 0;
+    LZ_compress_finish( encoder );
+    while( true )
+      {
+      const int rd = LZ_compress_read( encoder, mid_buffer, buffer_size );
+      if( rd < 0 )
+        {
+        fprintf( stderr, "lzcheck: xclose: LZ_compress_read error: %s\n",
+                 LZ_strerror( LZ_compress_errno( encoder ) ) );
+        exit( 3 );
+        }
+      size += rd;
+      if( LZ_compress_finished( encoder ) == 1 ) break;
+      }
+    if( size > 0 )
+      {
+      fprintf( stderr, "lzcheck: %lld bytes remain in encoder.\n", size );
+      exit( 3 );
+      }
+    }
+  if( LZ_compress_close( encoder ) < 0 ) exit( 1 );
+  }
+
+
+static void xclose_decoder( LZ_Decoder * const decoder, const bool finish )
+  {
+  if( finish )
+    {
+    unsigned long long size = 0;
+    LZ_decompress_finish( decoder );
+    while( true )
+      {
+      const int rd = LZ_decompress_read( decoder, out_buffer, buffer_size );
+      if( rd < 0 )
+        {
+        fprintf( stderr, "lzcheck: xclose: LZ_decompress_read error: %s\n",
+                 LZ_strerror( LZ_decompress_errno( decoder ) ) );
+        exit( 3 );
+        }
+      size += rd;
+      if( LZ_decompress_finished( decoder ) == 1 ) break;
+      }
+    if( size > 0 )
+      {
+      fprintf( stderr, "lzcheck: %lld bytes remain in decoder.\n", size );
+      exit( 3 );
+      }
+    }
+  if( LZ_decompress_close( decoder ) < 0 ) exit( 1 );
+  }
+
+
+/* Return the next (usually newline-terminated) chunk of data from file.
+   The size returned in *sizep is always <= buffer_size.
+   If sizep is a null pointer, rewind the file, reset state, and return.
+   If file is at EOF, return an empty line.
+*/
+static const uint8_t * next_line( FILE * const file, int * const sizep )
+  {
+  static int l = 0;
+  static int read_size = 0;
+  int r;
+
+  if( !sizep ) { rewind( file ); l = read_size = 0; return in_buffer; }
+  if( l >= read_size )
+    {
+    l = 0; read_size = fread( in_buffer, 1, buffer_size, file );
+    if( l >= read_size ) { *sizep = 0; return in_buffer; }  /* end of file */
     }
 
-  while( retval <= 1 )
-    {
-    int i, l, r;
-    const int read_size = fread( in_buffer, 1, buffer_size, file );
-    if( read_size <= 0 ) break;			/* end of file */
+  for( r = l + 1; r < read_size && in_buffer[r-1] != '\n'; ++r );
+  *sizep = r - l; l = r;
+  return in_buffer + l - *sizep;
+  }
 
-    for( l = 0, r = 1; r <= read_size; l = r, ++r )
+
+static int check_sync_flush( FILE * const file, const int dictionary_size )
+  {
+  LZ_Encoder * const encoder = xopen_encoder( dictionary_size );
+  LZ_Decoder * const decoder = xopen_decoder();
+  int retval = 0;
+
+  while( retval <= 1 )			/* test LZ_compress_sync_flush */
+    {
+    int in_size, mid_size, out_size;
+    int line_size;
+    const uint8_t * const line_buf = next_line( file, &line_size );
+    if( line_size <= 0 ) break;			/* end of file */
+
+    in_size = LZ_compress_write( encoder, line_buf, line_size );
+    if( in_size < 0 )
       {
-      int in_size, mid_size, out_size;
-      while( r < read_size && in_buffer[r-1] != '\n' ) ++r;
-      in_size = LZ_compress_write( encoder, in_buffer + l, r - l );
-      if( in_size < r - l ) r = l + in_size;
-      LZ_compress_sync_flush( encoder );
+      fprintf( stderr, "lzcheck: LZ_compress_write error: %s\n",
+               LZ_strerror( LZ_compress_errno( encoder ) ) );
+      retval = 3; break;
+      }
+    if( in_size < line_size )
+      {
+      fprintf( stderr, "lzcheck: sync: LZ_compress_write only accepted %d "
+               "of %d bytes\n", in_size, line_size );
       mid_size = LZ_compress_read( encoder, mid_buffer, buffer_size );
-      if( mid_size < 0 )
+      const int wr =
+        LZ_compress_write( encoder, line_buf + in_size, line_size - in_size );
+      if( wr < 0 )
         {
-        fprintf( stderr, "lzcheck: LZ_compress_read error: %s\n",
+        fprintf( stderr, "lzcheck: LZ_compress_write error: %s\n",
                  LZ_strerror( LZ_compress_errno( encoder ) ) );
         retval = 3; break;
         }
-      LZ_decompress_write( decoder, mid_buffer, mid_size );
-      out_size = LZ_decompress_read( decoder, out_buffer, buffer_size );
-      if( out_size < 0 )
+      if( wr + in_size != line_size )
         {
-        fprintf( stderr, "lzcheck: LZ_decompress_read error: %s\n",
-                 LZ_strerror( LZ_decompress_errno( decoder ) ) );
+        fprintf( stderr, "lzcheck: sync: LZ_compress_write only accepted %d "
+                 "of %d remaining bytes\n", wr, line_size - in_size );
         retval = 3; break;
         }
-
-      if( out_size != in_size || memcmp( in_buffer + l, out_buffer, out_size ) )
+      in_size += wr;
+      LZ_compress_sync_flush( encoder );
+      const int rd = LZ_compress_read( encoder, mid_buffer + mid_size,
+                                       buffer_size - mid_size );
+      if( rd > 0 ) mid_size += rd;
+      else if( rd < 0 ) mid_size = -1;
+      }
+    else
+      {
+      LZ_compress_sync_flush( encoder );
+      if( line_buf[0] & 1 )	/* read all data at once or byte by byte */
+        mid_size = LZ_compress_read( encoder, mid_buffer, buffer_size );
+      else for( mid_size = 0; mid_size < buffer_size; )
         {
-        fprintf( stderr, "lzcheck: Sync error at pos %d  in_size = %d, out_size = %d\n",
-                 l, in_size, out_size );
-        for( i = 0; i < in_size; ++i )
-          fputc( in_buffer[l+i], stderr );
-        if( in_buffer[l+in_size-1] != '\n' )
-          fputc( '\n', stderr );
-        for( i = 0; i < out_size; ++i )
-          fputc( out_buffer[i], stderr );
-        fputc( '\n', stderr );
-        retval = 1;
+        const int rd = LZ_compress_read( encoder, mid_buffer + mid_size, 1 );
+        if( rd > 0 ) mid_size += rd;
+        else { if( rd < 0 ) { mid_size = -1; } break; }
         }
       }
+    if( mid_size < 0 )
+      {
+      fprintf( stderr, "lzcheck: LZ_compress_read error: %s\n",
+               LZ_strerror( LZ_compress_errno( encoder ) ) );
+      retval = 3; break;
+      }
+    LZ_decompress_write( decoder, mid_buffer, mid_size );
+    out_size = LZ_decompress_read( decoder, out_buffer, buffer_size );
+    if( out_size < 0 )
+      {
+      fprintf( stderr, "lzcheck: LZ_decompress_read error: %s\n",
+               LZ_strerror( LZ_decompress_errno( decoder ) ) );
+      retval = 3; break;
+      }
+
+    if( out_size != in_size || memcmp( line_buf, out_buffer, out_size ) )
+      {
+      fprintf( stderr, "lzcheck: LZ_compress_sync_flush error: "
+                       "in_size = %d, out_size = %d\n", in_size, out_size );
+      show_line( line_buf, in_size );
+      show_line( out_buffer, out_size );
+      retval = 1;
+      }
     }
 
   if( retval <= 1 )
     {
-    rewind( file );
+    int rd = 0;
     if( LZ_compress_finish( encoder ) < 0 ||
-        LZ_decompress_write( decoder, mid_buffer, LZ_compress_read( encoder, mid_buffer, buffer_size ) ) < 0 ||
-        LZ_decompress_read( decoder, out_buffer, buffer_size ) != 0 ||
-        LZ_compress_restart_member( encoder, member_size ) < 0 )
+        ( rd = LZ_compress_read( encoder, mid_buffer, buffer_size ) ) < 0 )
       {
-      fprintf( stderr, "lzcheck: Can't finish member: %s\n",
-               LZ_strerror( LZ_decompress_errno( decoder ) ) );
+      fprintf( stderr, "lzcheck: Can't drain encoder: %s\n",
+               LZ_strerror( LZ_compress_errno( encoder ) ) );
       retval = 3;
       }
+    LZ_decompress_write( decoder, mid_buffer, rd );
     }
 
-  while( retval <= 1 )
-    {
-    int i, l, r, size;
-    const int read_size = fread( in_buffer, 1, buffer_size / 2, file );
-    if( read_size <= 0 ) break;			/* end of file */
+  xclose_decoder( decoder, retval == 0 );
+  xclose_encoder( encoder, retval == 0 );
+  return retval;
+  }
 
-    for( l = 0, r = 1; r <= read_size; l = r, ++r )
+
+/* Test member by member decompression without calling LZ_decompress_finish,
+   inserting leading garbage before some members, and resetting the
+   decompressor sometimes. Test that the increase in total_in_size when
+   syncing to member is equal to the size of the leading garbage skipped.
+*/
+static int check_members( FILE * const file, const int dictionary_size )
+  {
+  LZ_Encoder * const encoder = xopen_encoder( dictionary_size );
+  LZ_Decoder * const decoder = xopen_decoder();
+  int retval = 0;
+
+  while( retval <= 1 )			/* test LZ_compress_restart_member */
+    {
+    unsigned long long garbage_begin = 0;  /* avoid warning from gcc 3.3.6 */
+    int leading_garbage, in_size, mid_size, out_size;
+    int line_size;
+    const uint8_t * const line_buf = next_line( file, &line_size );
+    if( line_size <= 0 &&	/* end of file, write at least 1 member */
+        LZ_decompress_total_in_size( decoder ) != 0 ) break;
+
+    if( LZ_compress_finished( encoder ) == 1 )
       {
-      int leading_garbage, in_size, mid_size, out_size;
-      while( r < read_size && in_buffer[r-1] != '\n' ) ++r;
-      leading_garbage = (l == 0) ? min( r, read_size / 2 ) : 0;
-      in_size = LZ_compress_write( encoder, in_buffer + l, r - l );
-      if( in_size < r - l ) r = l + in_size;
-      LZ_compress_sync_flush( encoder );
-      if( leading_garbage )
-        memset( mid_buffer, in_buffer[0], leading_garbage );
-      mid_size = LZ_compress_read( encoder, mid_buffer + leading_garbage,
-                                   buffer_size - leading_garbage );
-      if( mid_size < 0 )
+      if( LZ_compress_restart_member( encoder, member_size ) < 0 )
         {
-        fprintf( stderr, "lzcheck: LZ_compress_read error: %s\n",
+        fprintf( stderr, "lzcheck: Can't restart member: %s\n",
                  LZ_strerror( LZ_compress_errno( encoder ) ) );
         retval = 3; break;
         }
-      LZ_decompress_write( decoder, mid_buffer, mid_size + leading_garbage );
-      out_size = LZ_decompress_read( decoder, out_buffer, buffer_size );
-      if( out_size < 0 )
+      if( line_size >= 2 && line_buf[1] == 'h' )
+        LZ_decompress_reset( decoder );
+      }
+    in_size = LZ_compress_write( encoder, line_buf, line_size );
+    if( in_size < line_size )
+      fprintf( stderr, "lzcheck: member: LZ_compress_write only accepted %d of %d bytes\n",
+               in_size, line_size );
+    LZ_compress_finish( encoder );
+    if( line_size * 3 < buffer_size && line_buf[0] == 't' )
+      { leading_garbage = line_size;
+        memset( mid_buffer, in_buffer[0], leading_garbage );
+        garbage_begin = LZ_decompress_total_in_size( decoder ); }
+    else leading_garbage = 0;
+    mid_size = LZ_compress_read( encoder, mid_buffer + leading_garbage,
+                                 buffer_size - leading_garbage );
+    if( mid_size < 0 )
+      {
+      fprintf( stderr, "lzcheck: member: LZ_compress_read error: %s\n",
+               LZ_strerror( LZ_compress_errno( encoder ) ) );
+      retval = 3; break;
+      }
+    LZ_decompress_write( decoder, mid_buffer, leading_garbage + mid_size );
+    out_size = LZ_decompress_read( decoder, out_buffer, buffer_size );
+    if( out_size < 0 )
+      {
+      if( leading_garbage &&
+          ( LZ_decompress_errno( decoder ) == LZ_header_error ||
+            LZ_decompress_errno( decoder ) == LZ_data_error ) )
         {
-        if( LZ_decompress_errno( decoder ) == LZ_header_error ||
-            LZ_decompress_errno( decoder ) == LZ_data_error )
+        LZ_decompress_sync_to_member( decoder );  /* skip leading garbage */
+        const unsigned long long garbage_end =
+          LZ_decompress_total_in_size( decoder );
+        if( garbage_end - garbage_begin != (unsigned)leading_garbage )
           {
-          LZ_decompress_sync_to_member( decoder );  /* remove leading garbage */
-          out_size = LZ_decompress_read( decoder, out_buffer, buffer_size );
-          }
-        if( out_size < 0 )
-          {
-          fprintf( stderr, "lzcheck: LZ_decompress_read error: %s\n",
-                   LZ_strerror( LZ_decompress_errno( decoder ) ) );
+          fprintf( stderr, "lzcheck: member: LZ_decompress_sync_to_member error:\n"
+                   "  garbage_begin = %llu garbage_end = %llu "
+                   "difference = %llu expected = %d\n", garbage_begin,
+                   garbage_end, garbage_end - garbage_begin, leading_garbage );
           retval = 3; break;
           }
+        out_size = LZ_decompress_read( decoder, out_buffer, buffer_size );
         }
-
-      if( out_size != in_size || memcmp( in_buffer + l, out_buffer, out_size ) )
+      if( out_size < 0 )
         {
-        fprintf( stderr, "lzcheck: Sync error at pos %d  in_size = %d, out_size = %d, leading garbage = %d\n",
-                 l, in_size, out_size, leading_garbage );
-        for( i = 0; i < in_size; ++i )
-          fputc( in_buffer[l+i], stderr );
-        if( in_buffer[l+in_size-1] != '\n' )
-          fputc( '\n', stderr );
-        for( i = 0; i < out_size; ++i )
-          fputc( out_buffer[i], stderr );
-        fputc( '\n', stderr );
-        retval = 1;
+        fprintf( stderr, "lzcheck: member: LZ_decompress_read error: %s\n",
+                 LZ_strerror( LZ_decompress_errno( decoder ) ) );
+        retval = 3; break;
         }
       }
-    if( retval >= 3 ) break;
 
-    if( LZ_compress_finish( encoder ) < 0 ||
-        LZ_decompress_write( decoder, mid_buffer, LZ_compress_read( encoder, mid_buffer, buffer_size ) ) < 0 ||
-        LZ_decompress_read( decoder, out_buffer, buffer_size ) != 0 ||
-        LZ_decompress_reset( decoder ) < 0 ||
-        LZ_compress_restart_member( encoder, member_size ) < 0 )
+    if( out_size != in_size || memcmp( line_buf, out_buffer, out_size ) )
       {
-      fprintf( stderr, "lzcheck: Can't restart member: %s\n",
-               LZ_strerror( LZ_decompress_errno( decoder ) ) );
-      retval = 3; break;
-      }
-
-    size = min( 100, read_size );
-    if( LZ_compress_write( encoder, in_buffer, size ) != size ||
-        LZ_compress_finish( encoder ) < 0 ||
-        LZ_decompress_write( decoder, mid_buffer, LZ_compress_read( encoder, mid_buffer, buffer_size ) ) < 0 ||
-        LZ_decompress_read( decoder, out_buffer, 0 ) != 0 ||
-        LZ_decompress_sync_to_member( decoder ) < 0 ||
-        LZ_compress_restart_member( encoder, member_size ) < 0 )
-      {
-      fprintf( stderr, "lzcheck: Can't seek to next member: %s\n",
-               LZ_strerror( LZ_decompress_errno( decoder ) ) );
-      retval = 3; break;
+      fprintf( stderr, "lzcheck: LZ_compress_restart_member error: "
+                       "in_size = %d, out_size = %d\n", in_size, out_size );
+      show_line( line_buf, in_size );
+      show_line( out_buffer, out_size );
+      retval = 1;
       }
     }
 
-  LZ_decompress_close( decoder );
-  LZ_compress_close( encoder );
+  xclose_decoder( decoder, retval == 0 );
+  xclose_encoder( encoder, retval == 0 );
   return retval;
   }
 
 
 int main( const int argc, const char * const argv[] )
   {
-  FILE * file;
-  int retval;
+  int retval = 0, i;
+  int open_failures = 0;
+  const char opt = ( argc > 2 &&
+    ( strcmp( argv[1], "-m" ) == 0 || strcmp( argv[1], "-s" ) == 0 ) ) ?
+    argv[1][1] : 0;
+  const int first = opt ? 2 : 1;
+  const bool verbose = opt != 0 || argc > first + 1;
 
   if( argc < 2 )
     {
-    fputs( "Usage: lzcheck filename.txt\n", stderr );
+    fputs( "Usage: lzcheck [-m|-s] filename.txt...\n", stderr );
     return 1;
     }
 
-  file = fopen( argv[1], "rb" );
-  if( !file )
+  for( i = first; i < argc && retval == 0; ++i )
     {
-    fprintf( stderr, "lzcheck: Can't open file '%s' for reading.\n", argv[1] );
-    return 1;
-    }
-/*  fprintf( stderr, "lzcheck: Testing file '%s'\n", argv[1] ); */
+    struct stat st;
+    if( stat( argv[i], &st ) != 0 || !S_ISREG( st.st_mode ) ) continue;
+    FILE * file = fopen( argv[i], "rb" );
+    if( !file )
+      {
+      fprintf( stderr, "lzcheck: %s: Can't open file for reading.\n", argv[i] );
+      ++open_failures; continue;
+      }
+    if( verbose ) fprintf( stderr, "  Testing file '%s'\n", argv[i] );
 
-  retval = lzcheck( file, 65535 );	/* 65535,16 chooses fast encoder */
-  if( retval == 0 )
-    { rewind( file ); retval = lzcheck( file, 1 << 20 ); }
-  fclose( file );
+    /* 65535,16 chooses fast encoder */
+    if( opt != 'm' ) retval = check_sync_flush( file, 65535 );
+    if( retval == 0 && opt != 'm' )
+      { next_line( file, 0 ); retval = check_sync_flush( file, 1 << 20 ); }
+    if( retval == 0 && opt != 's' )
+      { next_line( file, 0 ); retval = check_members( file, 65535 ); }
+    if( retval == 0 && opt != 's' )
+      { next_line( file, 0 ); retval = check_members( file, 1 << 20 ); }
+    fclose( file );
+    }
+  if( open_failures > 0 && verbose )
+    fprintf( stderr, "lzcheck: warning: %d %s failed to open.\n",
+             open_failures, ( open_failures == 1 ) ? "file" : "files" );
+  if( retval == 0 && open_failures ) retval = 1;
   return retval;
   }

lzip.h

@@ -1,28 +1,20 @@
-/*  Lzlib - Compression library for the lzip format
-    Copyright (C) 2009-2016 Antonio Diaz Diaz.
+/* Lzlib - Compression library for the lzip format
+   Copyright (C) 2009-2025 Antonio Diaz Diaz.
 
-    This library is free software: you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation, either version 2 of the License, or
-    (at your option) any later version.
+   This library is free software. Redistribution and use in source and
+   binary forms, with or without modification, are permitted provided
+   that the following conditions are met:
 
-    This library is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
+   1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions, and the following disclaimer.
 
-    You should have received a copy of the GNU General Public License
-    along with this library.  If not, see <http://www.gnu.org/licenses/>.
+   2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions, and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
 
-    As a special exception, you may use this file as part of a free
-    software library without restriction.  Specifically, if other files
-    instantiate templates or use macros or inline functions from this
-    file, or you compile this file and link it with other files to
-    produce an executable, this file does not by itself cause the
-    resulting executable to be covered by the GNU General Public
-    License.  This exception does not however invalidate any other
-    reasons why the executable file might be covered by the GNU General
-    Public License.
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 */
 
 #ifndef max
@@ -43,15 +35,13 @@ static inline State St_set_char( const State st )
   static const State next[states] = { 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 4, 5 };
   return next[st];
   }
-
+static inline State St_set_char_rep() { return 8; }
 static inline State St_set_match( const State st )
-  { return ( ( st < 7 ) ? 7 : 10 ); }
-
+  { return ( st < 7 ) ? 7 : 10; }
 static inline State St_set_rep( const State st )
-  { return ( ( st < 7 ) ? 8 : 11 ); }
-
-static inline State St_set_short_rep( const State st )
-  { return ( ( st < 7 ) ? 9 : 11 ); }
+  { return ( st < 7 ) ? 8 : 11; }
+static inline State St_set_shortrep( const State st )
+  { return ( st < 7 ) ? 9 : 11; }
 
 
 enum {
@@ -89,7 +79,7 @@ static inline int get_len_state( const int len )
   { return min( len - min_match_len, len_states - 1 ); }
 
 static inline int get_lit_state( const uint8_t prev_byte )
-  { return ( prev_byte >> ( 8 - literal_context_bits ) ); }
+  { return prev_byte >> ( 8 - literal_context_bits ); }
 
 
 enum { bit_model_move_bits = 5,
@@ -104,16 +94,16 @@ static inline void Bm_init( Bit_model * const probability )
 static inline void Bm_array_init( Bit_model bm[], const int size )
   { int i; for( i = 0; i < size; ++i ) Bm_init( &bm[i] ); }
 
-struct Len_model
+typedef struct Len_model
   {
   Bit_model choice1;
   Bit_model choice2;
   Bit_model bm_low[pos_states][len_low_symbols];
   Bit_model bm_mid[pos_states][len_mid_symbols];
   Bit_model bm_high[len_high_symbols];
-  };
+  } Len_model;
 
-static inline void Lm_init( struct Len_model * const lm )
+static inline void Lm_init( Len_model * const lm )
   {
   Bm_init( &lm->choice1 );
   Bm_init( &lm->choice2 );
@@ -174,19 +164,22 @@ static const uint32_t crc32[256] =
 static inline void CRC32_update_byte( uint32_t * const crc, const uint8_t byte )
   { *crc = crc32[(*crc^byte)&0xFF] ^ ( *crc >> 8 ); }
 
+/* about as fast as it is possible without messing with endianness */
 static inline void CRC32_update_buf( uint32_t * const crc,
                                      const uint8_t * const buffer,
                                      const int size )
   {
   int i;
+  uint32_t c = *crc;
   for( i = 0; i < size; ++i )
-    *crc = crc32[(*crc^buffer[i])&0xFF] ^ ( *crc >> 8 );
+    c = crc32[(c^buffer[i])&0xFF] ^ ( c >> 8 );
+  *crc = c;
   }
 
 
 static inline bool isvalid_ds( const unsigned dictionary_size )
-  { return ( dictionary_size >= min_dictionary_size &&
-             dictionary_size <= max_dictionary_size ); }
+  { return dictionary_size >= min_dictionary_size &&
+           dictionary_size <= max_dictionary_size; }
 
 
 static inline int real_bits( unsigned value )
@@ -197,42 +190,51 @@ static inline int real_bits( unsigned value )
   }
 
 
-static const uint8_t magic_string[4] = { 0x4C, 0x5A, 0x49, 0x50 }; /* "LZIP" */
+static const uint8_t lzip_magic[4] = { 0x4C, 0x5A, 0x49, 0x50 }; /* "LZIP" */
 
-typedef uint8_t File_header[6];		/* 0-3 magic bytes */
+enum { Lh_size = 6 };
+typedef uint8_t Lzip_header[Lh_size];	/* 0-3 magic bytes */
 					/*   4 version */
-					/*   5 coded_dict_size */
-enum { Fh_size = 6 };
+					/*   5 coded dictionary size */
 
-static inline void Fh_set_magic( File_header data )
-  { memcpy( data, magic_string, 4 ); data[4] = 1; }
+static inline void Lh_set_magic( Lzip_header data )
+  { memcpy( data, lzip_magic, 4 ); data[4] = 1; }
 
-static inline bool Fh_verify_magic( const File_header data )
-  { return ( memcmp( data, magic_string, 4 ) == 0 ); }
+static inline bool Lh_check_magic( const Lzip_header data )
+  { return memcmp( data, lzip_magic, 4 ) == 0; }
 
-/* detect truncated header */
-static inline bool Fh_verify_prefix( const File_header data, const int size )
+/* detect (truncated) header */
+static inline bool Lh_check_prefix( const Lzip_header data, const int sz )
   {
-  int i; for( i = 0; i < size && i < 4; ++i )
-    if( data[i] != magic_string[i] ) return false;
-  return ( size > 0 );
+  int i; for( i = 0; i < sz && i < 4; ++i )
+    if( data[i] != lzip_magic[i] ) return false;
+  return sz > 0;
   }
 
-static inline uint8_t Fh_version( const File_header data )
+/* detect corrupt header */
+static inline bool Lh_check_corrupt( const Lzip_header data )
+  {
+  int matches = 0;
+  int i; for( i = 0; i < 4; ++i )
+    if( data[i] == lzip_magic[i] ) ++matches;
+  return matches > 1 && matches < 4;
+  }
+
+static inline uint8_t Lh_version( const Lzip_header data )
   { return data[4]; }
 
-static inline bool Fh_verify_version( const File_header data )
-  { return ( data[4] == 1 ); }
+static inline bool Lh_check_version( const Lzip_header data )
+  { return data[4] == 1; }
 
-static inline unsigned Fh_get_dictionary_size( const File_header data )
+static inline unsigned Lh_get_dictionary_size( const Lzip_header data )
   {
-  unsigned sz = ( 1 << ( data[5] & 0x1F ) );
+  unsigned sz = 1 << ( data[5] & 0x1F );
   if( sz > min_dictionary_size )
     sz -= ( sz / 16 ) * ( ( data[5] >> 5 ) & 7 );
   return sz;
   }
 
-static inline bool Fh_set_dictionary_size( File_header data, const unsigned sz )
+static inline bool Lh_set_dictionary_size( Lzip_header data, const unsigned sz )
   {
   if( !isvalid_ds( sz ) ) return false;
   data[5] = real_bits( sz - 1 );
@@ -240,55 +242,53 @@ static inline bool Fh_set_dictionary_size( File_header data, const unsigned sz )
     {
     const unsigned base_size = 1 << data[5];
     const unsigned fraction = base_size / 16;
-    int i;
+    unsigned i;
     for( i = 7; i >= 1; --i )
       if( base_size - ( i * fraction ) >= sz )
-        { data[5] |= ( i << 5 ); break; }
+        { data[5] |= i << 5; break; }
     }
   return true;
   }
 
-static inline bool Fh_verify( const File_header data )
+static inline bool Lh_check( const Lzip_header data )
   {
-  if( Fh_verify_magic( data ) && Fh_verify_version( data ) )
-    return isvalid_ds( Fh_get_dictionary_size( data ) );
-  return false;
+  return Lh_check_magic( data ) && Lh_check_version( data ) &&
+         isvalid_ds( Lh_get_dictionary_size( data ) );
   }
 
 
-typedef uint8_t File_trailer[20];
+enum { Lt_size = 20 };
+typedef uint8_t Lzip_trailer[Lt_size];
 			/*  0-3  CRC32 of the uncompressed data */
 			/*  4-11 size of the uncompressed data */
 			/* 12-19 member size including header and trailer */
 
-enum { Ft_size = 20 };
-
-static inline unsigned Ft_get_data_crc( const File_trailer data )
+static inline unsigned Lt_get_data_crc( const Lzip_trailer data )
   {
   unsigned tmp = 0;
   int i; for( i = 3; i >= 0; --i ) { tmp <<= 8; tmp += data[i]; }
   return tmp;
   }
 
-static inline void Ft_set_data_crc( File_trailer data, unsigned crc )
+static inline void Lt_set_data_crc( Lzip_trailer data, unsigned crc )
   { int i; for( i = 0; i <= 3; ++i ) { data[i] = (uint8_t)crc; crc >>= 8; } }
 
-static inline unsigned long long Ft_get_data_size( const File_trailer data )
+static inline unsigned long long Lt_get_data_size( const Lzip_trailer data )
   {
   unsigned long long tmp = 0;
   int i; for( i = 11; i >= 4; --i ) { tmp <<= 8; tmp += data[i]; }
   return tmp;
   }
 
-static inline void Ft_set_data_size( File_trailer data, unsigned long long sz )
+static inline void Lt_set_data_size( Lzip_trailer data, unsigned long long sz )
   { int i; for( i = 4; i <= 11; ++i ) { data[i] = (uint8_t)sz; sz >>= 8; } }
 
-static inline unsigned long long Ft_get_member_size( const File_trailer data )
+static inline unsigned long long Lt_get_member_size( const Lzip_trailer data )
   {
   unsigned long long tmp = 0;
   int i; for( i = 19; i >= 12; --i ) { tmp <<= 8; tmp += data[i]; }
   return tmp;
   }
 
-static inline void Ft_set_member_size( File_trailer data, unsigned long long sz )
+static inline void Lt_set_member_size( Lzip_trailer data, unsigned long long sz )
   { int i; for( i = 12; i <= 19; ++i ) { data[i] = (uint8_t)sz; sz >>= 8; } }

lzlib.c

@@ -1,28 +1,20 @@
-/*  Lzlib - Compression library for the lzip format
-    Copyright (C) 2009-2016 Antonio Diaz Diaz.
+/* Lzlib - Compression library for the lzip format
+   Copyright (C) 2009-2025 Antonio Diaz Diaz.
 
-    This library is free software: you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation, either version 2 of the License, or
-    (at your option) any later version.
+   This library is free software. Redistribution and use in source and
+   binary forms, with or without modification, are permitted provided
+   that the following conditions are met:
 
-    This library is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
+   1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions, and the following disclaimer.
 
-    You should have received a copy of the GNU General Public License
-    along with this library.  If not, see <http://www.gnu.org/licenses/>.
+   2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions, and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
 
-    As a special exception, you may use this file as part of a free
-    software library without restriction.  Specifically, if other files
-    instantiate templates or use macros or inline functions from this
-    file, or you compile this file and link it with other files to
-    produce an executable, this file does not by itself cause the
-    resulting executable to be covered by the GNU General Public
-    License.  This exception does not however invalidate any other
-    reasons why the executable file might be covered by the GNU General
-    Public License.
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 */
 
 #include <stdbool.h>
@@ -47,14 +39,14 @@ struct LZ_Encoder
   {
   unsigned long long partial_in_size;
   unsigned long long partial_out_size;
-  struct LZ_encoder_base * lz_encoder_base;	/* these 3 pointers make a */
-  struct LZ_encoder * lz_encoder;		/* polymorphic encoder */
-  struct FLZ_encoder * flz_encoder;
-  enum LZ_Errno lz_errno;
+  LZ_encoder_base * lz_encoder_base;		/* these 3 pointers make a */
+  LZ_encoder * lz_encoder;			/* polymorphic encoder */
+  FLZ_encoder * flz_encoder;
+  LZ_Errno lz_errno;
   bool fatal;
   };
 
-static void LZ_Encoder_init( struct LZ_Encoder * const e )
+static void LZ_Encoder_init( LZ_Encoder * const e )
   {
   e->partial_in_size = 0;
   e->partial_out_size = 0;
@@ -70,16 +62,16 @@ struct LZ_Decoder
   {
   unsigned long long partial_in_size;
   unsigned long long partial_out_size;
-  struct Range_decoder * rdec;
-  struct LZ_decoder * lz_decoder;
-  enum LZ_Errno lz_errno;
-  File_header member_header;		/* header of current member */
+  Range_decoder * rdec;
+  LZ_decoder * lz_decoder;
+  LZ_Errno lz_errno;
+  Lzip_header member_header;		/* header of current member */
   bool fatal;
   bool first_header;			/* true until first header is read */
   bool seeking;
   };
 
-static void LZ_Decoder_init( struct LZ_Decoder * const d )
+static void LZ_Decoder_init( LZ_Decoder * const d )
   {
   int i;
   d->partial_in_size = 0;
@@ -87,14 +79,14 @@ static void LZ_Decoder_init( struct LZ_Decoder * const d )
   d->rdec = 0;
   d->lz_decoder = 0;
   d->lz_errno = LZ_ok;
-  for( i = 0; i < Fh_size; ++i ) d->member_header[i] = 0;
+  for( i = 0; i < Lh_size; ++i ) d->member_header[i] = 0;
   d->fatal = false;
   d->first_header = true;
   d->seeking = false;
   }
 
 
-static bool verify_encoder( struct LZ_Encoder * const e )
+static bool check_encoder( LZ_Encoder * const e )
   {
   if( !e ) return false;
   if( !e->lz_encoder_base || ( !e->lz_encoder && !e->flz_encoder ) ||
@@ -104,7 +96,7 @@ static bool verify_encoder( struct LZ_Encoder * const e )
   }
 
 
-static bool verify_decoder( struct LZ_Decoder * const d )
+static bool check_decoder( LZ_Decoder * const d )
   {
   if( !d ) return false;
   if( !d->rdec )
@@ -113,12 +105,13 @@ static bool verify_decoder( struct LZ_Decoder * const d )
   }
 
 
-/*------------------------- Misc Functions -------------------------*/
+/* ------------------------- Misc Functions ------------------------- */
+
+int LZ_api_version( void ) { return LZ_API_VERSION; }
 
 const char * LZ_version( void ) { return LZ_version_string; }
 
-
-const char * LZ_strerror( const enum LZ_Errno lz_errno )
+const char * LZ_strerror( const LZ_Errno lz_errno )
   {
   switch( lz_errno )
     {
@@ -127,7 +120,7 @@ const char * LZ_strerror( const enum LZ_Errno lz_errno )
     case LZ_mem_error     : return "Not enough memory";
     case LZ_sequence_error: return "Sequence error";
     case LZ_header_error  : return "Header error";
-    case LZ_unexpected_eof: return "Unexpected eof";
+    case LZ_unexpected_eof: return "Unexpected EOF";
     case LZ_data_error    : return "Data error";
     case LZ_library_error : return "Library error";
     }
@@ -143,18 +136,17 @@ int LZ_min_match_len_limit( void ) { return min_match_len_limit; }
 int LZ_max_match_len_limit( void ) { return max_match_len; }
 
 
-/*---------------------- Compression Functions ----------------------*/
+/* --------------------- Compression Functions --------------------- */
 
-struct LZ_Encoder * LZ_compress_open( const int dictionary_size,
-                                      const int match_len_limit,
-                                      const unsigned long long member_size )
+LZ_Encoder * LZ_compress_open( const int dictionary_size,
+                               const int match_len_limit,
+                               const unsigned long long member_size )
   {
-  File_header header;
-  struct LZ_Encoder * const e =
-    (struct LZ_Encoder *)malloc( sizeof (struct LZ_Encoder) );
+  Lzip_header header;
+  LZ_Encoder * const e = (LZ_Encoder *)malloc( sizeof (LZ_Encoder) );
   if( !e ) return 0;
   LZ_Encoder_init( e );
-  if( !Fh_set_dictionary_size( header, dictionary_size ) ||
+  if( !Lh_set_dictionary_size( header, dictionary_size ) ||
       match_len_limit < min_match_len_limit ||
       match_len_limit > max_match_len ||
       member_size < min_dictionary_size )
@@ -163,15 +155,15 @@ struct LZ_Encoder * LZ_compress_open( const int dictionary_size,
     {
     if( dictionary_size == 65535 && match_len_limit == 16 )
       {
-      e->flz_encoder = (struct FLZ_encoder *)malloc( sizeof (struct FLZ_encoder) );
+      e->flz_encoder = (FLZ_encoder *)malloc( sizeof (FLZ_encoder) );
       if( e->flz_encoder && FLZe_init( e->flz_encoder, member_size ) )
         { e->lz_encoder_base = &e->flz_encoder->eb; return e; }
       free( e->flz_encoder ); e->flz_encoder = 0;
       }
     else
       {
-      e->lz_encoder = (struct LZ_encoder *)malloc( sizeof (struct LZ_encoder) );
-      if( e->lz_encoder && LZe_init( e->lz_encoder, Fh_get_dictionary_size( header ),
+      e->lz_encoder = (LZ_encoder *)malloc( sizeof (LZ_encoder) );
+      if( e->lz_encoder && LZe_init( e->lz_encoder, Lh_get_dictionary_size( header ),
                                      match_len_limit, member_size ) )
         { e->lz_encoder_base = &e->lz_encoder->eb; return e; }
       free( e->lz_encoder ); e->lz_encoder = 0;
@@ -183,7 +175,7 @@ struct LZ_Encoder * LZ_compress_open( const int dictionary_size,
   }
 
 
-int LZ_compress_close( struct LZ_Encoder * const e )
+int LZ_compress_close( LZ_Encoder * const e )
   {
   if( !e ) return -1;
   if( e->lz_encoder_base )
@@ -194,17 +186,17 @@ int LZ_compress_close( struct LZ_Encoder * const e )
   }
 
 
-int LZ_compress_finish( struct LZ_Encoder * const e )
+int LZ_compress_finish( LZ_Encoder * const e )
   {
-  if( !verify_encoder( e ) || e->fatal ) return -1;
+  if( !check_encoder( e ) || e->fatal ) return -1;
   Mb_finish( &e->lz_encoder_base->mb );
   /* if (open --> write --> finish) use same dictionary size as lzip. */
   /* this does not save any memory. */
   if( Mb_data_position( &e->lz_encoder_base->mb ) == 0 &&
-      LZ_compress_total_out_size( e ) == Fh_size )
+      Re_member_position( &e->lz_encoder_base->renc ) == Lh_size )
     {
     Mb_adjust_dictionary_size( &e->lz_encoder_base->mb );
-    Fh_set_dictionary_size( e->lz_encoder_base->renc.header,
+    Lh_set_dictionary_size( e->lz_encoder_base->renc.header,
                             e->lz_encoder_base->mb.dictionary_size );
     e->lz_encoder_base->renc.cb.buffer[5] = e->lz_encoder_base->renc.header[5];
     }
@@ -212,10 +204,10 @@ int LZ_compress_finish( struct LZ_Encoder * const e )
   }
 
 
-int LZ_compress_restart_member( struct LZ_Encoder * const e,
+int LZ_compress_restart_member( LZ_Encoder * const e,
                                 const unsigned long long member_size )
   {
-  if( !verify_encoder( e ) || e->fatal ) return -1;
+  if( !check_encoder( e ) || e->fatal ) return -1;
   if( !LZeb_member_finished( e->lz_encoder_base ) )
     { e->lz_errno = LZ_sequence_error; return -1; }
   if( member_size < min_dictionary_size )
@@ -231,114 +223,111 @@ int LZ_compress_restart_member( struct LZ_Encoder * const e,
   }
 
 
-int LZ_compress_sync_flush( struct LZ_Encoder * const e )
+int LZ_compress_sync_flush( LZ_Encoder * const e )
   {
-  if( !verify_encoder( e ) || e->fatal ) return -1;
-  if( !Mb_flushing_or_end( &e->lz_encoder_base->mb ) )
-    e->lz_encoder_base->mb.flushing = true;
+  if( !check_encoder( e ) || e->fatal ) return -1;
+  if( !e->lz_encoder_base->mb.at_stream_end )
+    e->lz_encoder_base->mb.sync_flush_pending = true;
   return 0;
   }
 
 
-int LZ_compress_read( struct LZ_Encoder * const e,
+int LZ_compress_read( LZ_Encoder * const e,
                       uint8_t * const buffer, const int size )
   {
-  int out_size = 0;
-  if( !verify_encoder( e ) || e->fatal ) return -1;
+  if( !check_encoder( e ) || e->fatal ) return -1;
   if( size < 0 ) return 0;
-  do {
+
+  { LZ_encoder_base * const eb = e->lz_encoder_base;
+  int out_size = Re_read_data( &eb->renc, buffer, size );
+  /* minimize number of calls to encode_member */
+  if( out_size < size || size == 0 )
+    {
     if( ( e->flz_encoder && !FLZe_encode_member( e->flz_encoder ) ) ||
         ( e->lz_encoder && !LZe_encode_member( e->lz_encoder ) ) )
       { e->lz_errno = LZ_library_error; e->fatal = true; return -1; }
-    if( e->lz_encoder_base->mb.flushing &&
-        Mb_available_bytes( &e->lz_encoder_base->mb ) <= 0 &&
-        LZeb_sync_flush( e->lz_encoder_base ) )
-      e->lz_encoder_base->mb.flushing = false;
-    out_size += Re_read_data( &e->lz_encoder_base->renc,
-                              buffer + out_size, size - out_size );
+    if( eb->mb.sync_flush_pending && Mb_available_bytes( &eb->mb ) <= 0 )
+      LZeb_try_sync_flush( eb );
+    out_size += Re_read_data( &eb->renc, buffer + out_size, size - out_size );
     }
-  while( e->lz_encoder_base->mb.flushing && out_size < size &&
-         Mb_enough_available_bytes( &e->lz_encoder_base->mb ) &&
-         Re_enough_free_bytes( &e->lz_encoder_base->renc ) );
-  return out_size;
+  return out_size; }
   }
 
 
-int LZ_compress_write( struct LZ_Encoder * const e,
+int LZ_compress_write( LZ_Encoder * const e,
                        const uint8_t * const buffer, const int size )
   {
-  if( !verify_encoder( e ) || e->fatal ) return -1;
+  if( !check_encoder( e ) || e->fatal ) return -1;
   return Mb_write_data( &e->lz_encoder_base->mb, buffer, size );
   }
 
 
-int LZ_compress_write_size( struct LZ_Encoder * const e )
+int LZ_compress_write_size( LZ_Encoder * const e )
   {
-  if( !verify_encoder( e ) || e->fatal ) return -1;
+  if( !check_encoder( e ) || e->fatal ) return -1;
   return Mb_free_bytes( &e->lz_encoder_base->mb );
   }
 
 
-enum LZ_Errno LZ_compress_errno( struct LZ_Encoder * const e )
+LZ_Errno LZ_compress_errno( LZ_Encoder * const e )
   {
   if( !e ) return LZ_bad_argument;
   return e->lz_errno;
   }
 
 
-int LZ_compress_finished( struct LZ_Encoder * const e )
+int LZ_compress_finished( LZ_Encoder * const e )
   {
-  if( !verify_encoder( e ) ) return -1;
-  return ( Mb_data_finished( &e->lz_encoder_base->mb ) &&
-           LZeb_member_finished( e->lz_encoder_base ) );
+  if( !check_encoder( e ) ) return -1;
+  return Mb_data_finished( &e->lz_encoder_base->mb ) &&
+         LZeb_member_finished( e->lz_encoder_base );
   }
 
 
-int LZ_compress_member_finished( struct LZ_Encoder * const e )
+int LZ_compress_member_finished( LZ_Encoder * const e )
   {
-  if( !verify_encoder( e ) ) return -1;
+  if( !check_encoder( e ) ) return -1;
   return LZeb_member_finished( e->lz_encoder_base );
   }
 
 
-unsigned long long LZ_compress_data_position( struct LZ_Encoder * const e )
+unsigned long long LZ_compress_data_position( LZ_Encoder * const e )
   {
-  if( !verify_encoder( e ) ) return 0;
+  if( !check_encoder( e ) ) return 0;
   return Mb_data_position( &e->lz_encoder_base->mb );
   }
 
 
-unsigned long long LZ_compress_member_position( struct LZ_Encoder * const e )
+unsigned long long LZ_compress_member_position( LZ_Encoder * const e )
   {
-  if( !verify_encoder( e ) ) return 0;
+  if( !check_encoder( e ) ) return 0;
   return Re_member_position( &e->lz_encoder_base->renc );
   }
 
 
-unsigned long long LZ_compress_total_in_size( struct LZ_Encoder * const e )
+unsigned long long LZ_compress_total_in_size( LZ_Encoder * const e )
   {
-  if( !verify_encoder( e ) ) return 0;
+  if( !check_encoder( e ) ) return 0;
   return e->partial_in_size + Mb_data_position( &e->lz_encoder_base->mb );
   }
 
 
-unsigned long long LZ_compress_total_out_size( struct LZ_Encoder * const e )
+unsigned long long LZ_compress_total_out_size( LZ_Encoder * const e )
   {
-  if( !verify_encoder( e ) ) return 0;
+  if( !check_encoder( e ) ) return 0;
   return e->partial_out_size + Re_member_position( &e->lz_encoder_base->renc );
   }
 
 
-/*--------------------- Decompression Functions ---------------------*/
+/* -------------------- Decompression Functions -------------------- */
 
-struct LZ_Decoder * LZ_decompress_open( void )
+LZ_Decoder * LZ_decompress_open( void )
   {
-  struct LZ_Decoder * const d =
-    (struct LZ_Decoder *)malloc( sizeof (struct LZ_Decoder) );
+  LZ_Decoder * const d = (LZ_Decoder *)malloc( sizeof (LZ_Decoder) );
   if( !d ) return 0;
   LZ_Decoder_init( d );
 
-  d->rdec = (struct Range_decoder *)malloc( sizeof (struct Range_decoder) );
+  d->rdec = (Range_decoder *)malloc( sizeof (Range_decoder) );
   if( !d->rdec || !Rd_init( d->rdec ) )
     {
     if( d->rdec ) { Rd_free( d->rdec ); free( d->rdec ); d->rdec = 0; }
@@ -348,7 +337,7 @@ struct LZ_Decoder * LZ_decompress_open( void )
   }
 
 
-int LZ_decompress_close( struct LZ_Decoder * const d )
+int LZ_decompress_close( LZ_Decoder * const d )
   {
   if( !d ) return -1;
   if( d->lz_decoder )
@@ -359,9 +348,9 @@ int LZ_decompress_close( struct LZ_Decoder * const d )
   }
 
 
-int LZ_decompress_finish( struct LZ_Decoder * const d )
+int LZ_decompress_finish( LZ_Decoder * const d )
   {
-  if( !verify_decoder( d ) || d->fatal ) return -1;
+  if( !check_decoder( d ) || d->fatal ) return -1;
   if( d->seeking )
     { d->seeking = false; d->partial_in_size += Rd_purge( d->rdec ); }
   else Rd_finish( d->rdec );
@@ -369,9 +358,9 @@ int LZ_decompress_finish( struct LZ_Decoder * const d )
   }
 
 
-int LZ_decompress_reset( struct LZ_Decoder * const d )
+int LZ_decompress_reset( LZ_Decoder * const d )
   {
-  if( !verify_decoder( d ) ) return -1;
+  if( !check_decoder( d ) ) return -1;
   if( d->lz_decoder )
     { LZd_free( d->lz_decoder ); free( d->lz_decoder ); d->lz_decoder = 0; }
   d->partial_in_size = 0;
@@ -385,10 +374,10 @@ int LZ_decompress_reset( struct LZ_Decoder * const d )
   }
 
 
-int LZ_decompress_sync_to_member( struct LZ_Decoder * const d )
+int LZ_decompress_sync_to_member( LZ_Decoder * const d )
   {
-  int skipped = 0;
-  if( !verify_decoder( d ) ) return -1;
+  unsigned skipped = 0;
+  if( !check_decoder( d ) ) return -1;
   if( d->lz_decoder )
     { LZd_free( d->lz_decoder ); free( d->lz_decoder ); d->lz_decoder = 0; }
   if( Rd_find_header( d->rdec, &skipped ) ) d->seeking = false;
@@ -404,12 +393,16 @@ int LZ_decompress_sync_to_member( struct LZ_Decoder * const d )
   }
 
 
-int LZ_decompress_read( struct LZ_Decoder * const d,
+int LZ_decompress_read( LZ_Decoder * const d,
                         uint8_t * const buffer, const int size )
   {
   int result;
-  if( !verify_decoder( d ) || d->fatal ) return -1;
-  if( d->seeking || size < 0 ) return 0;
+  if( !check_decoder( d ) ) return -1;
+  if( size < 0 ) return 0;
+  if( d->fatal )	/* don't return error until pending bytes are read */
+    { if( d->lz_decoder && !Cb_empty( &d->lz_decoder->cb ) ) goto get_data;
+      return -1; }
+  if( d->seeking ) return 0;
 
   if( d->lz_decoder && LZd_member_finished( d->lz_decoder ) )
     {
@@ -421,25 +414,42 @@ int LZ_decompress_read( struct LZ_Decoder * const d,
     int rd;
     d->partial_in_size += d->rdec->member_position;
     d->rdec->member_position = 0;
-    if( Rd_available_bytes( d->rdec ) < Fh_size + 5 &&
+    if( Rd_available_bytes( d->rdec ) < Lh_size + 5 &&
         !d->rdec->at_stream_end ) return 0;
     if( Rd_finished( d->rdec ) && !d->first_header ) return 0;
-    rd = Rd_read_data( d->rdec, d->member_header, Fh_size );
-    if( Rd_finished( d->rdec ) )
+    rd = Rd_read_data( d->rdec, d->member_header, Lh_size );
+    if( rd < Lh_size || Rd_finished( d->rdec ) )	/* End Of File */
       {
-      if( rd <= 0 || Fh_verify_prefix( d->member_header, rd ) )
+      if( rd <= 0 || Lh_check_prefix( d->member_header, rd ) )
         d->lz_errno = LZ_unexpected_eof;
       else
         d->lz_errno = LZ_header_error;
       d->fatal = true;
       return -1;
       }
-    if( !Fh_verify( d->member_header ) )
+    if( !Lh_check_magic( d->member_header ) )
       {
       /* unreading the header prevents sync_to_member from skipping a member
          if leading garbage is shorter than a full header; "lgLZIP\x01\x0C" */
       if( Rd_unread_data( d->rdec, rd ) )
-        d->lz_errno = LZ_header_error;
+        {
+        if( d->first_header || !Lh_check_corrupt( d->member_header ) )
+          d->lz_errno = LZ_header_error;
+        else
+          d->lz_errno = LZ_data_error;		/* corrupt header */
+        }
+      else
+        d->lz_errno = LZ_library_error;
+      d->fatal = true;
+      return -1;
+      }
+    if( !Lh_check_version( d->member_header ) ||
+        !isvalid_ds( Lh_get_dictionary_size( d->member_header ) ) )
+      {
+      /* Skip a possible "LZIP" leading garbage; "LZIPLZIP\x01\x0C".
+         Leave member_pos pointing to the first error. */
+      if( Rd_unread_data( d->rdec, 1 + !Lh_check_version( d->member_header ) ) )
+        d->lz_errno = LZ_data_error;	/* bad version or bad dict size */
       else
         d->lz_errno = LZ_library_error;
       d->fatal = true;
@@ -455,9 +465,9 @@ int LZ_decompress_read( struct LZ_Decoder * const d,
       d->fatal = true;
       return -1;
       }
-    d->lz_decoder = (struct LZ_decoder *)malloc( sizeof (struct LZ_decoder) );
+    d->lz_decoder = (LZ_decoder *)malloc( sizeof (LZ_decoder) );
     if( !d->lz_decoder || !LZd_init( d->lz_decoder, d->rdec,
-                             Fh_get_dictionary_size( d->member_header ) ) )
+                             Lh_get_dictionary_size( d->member_header ) ) )
       {					/* not enough free memory */
       if( d->lz_decoder )
         { LZd_free( d->lz_decoder ); free( d->lz_decoder ); d->lz_decoder = 0; }
@@ -470,30 +480,32 @@ int LZ_decompress_read( struct LZ_Decoder * const d,
   result = LZd_decode_member( d->lz_decoder );
   if( result != 0 )
     {
-    if( result == 2 )
-      { d->lz_errno = LZ_unexpected_eof;
-        d->rdec->member_position += Cb_used_bytes( &d->rdec->cb );
-        Cb_reset( &d->rdec->cb ); }
-    else if( result == 5 ) d->lz_errno = LZ_library_error;
+    if( result == 2 )			/* set input position at EOF */
+      { d->rdec->member_position += Cb_used_bytes( &d->rdec->cb );
+        Cb_reset( &d->rdec->cb );
+        d->lz_errno = LZ_unexpected_eof; }
+    else if( result == 6 ) d->lz_errno = LZ_library_error;
     else d->lz_errno = LZ_data_error;
     d->fatal = true;
-    return -1;
+    if( Cb_empty( &d->lz_decoder->cb ) ) return -1;
     }
+get_data:
   return Cb_read_data( &d->lz_decoder->cb, buffer, size );
   }
 
 
-int LZ_decompress_write( struct LZ_Decoder * const d,
+int LZ_decompress_write( LZ_Decoder * const d,
                          const uint8_t * const buffer, const int size )
   {
   int result;
-  if( !verify_decoder( d ) || d->fatal ) return -1;
+  if( !check_decoder( d ) || d->fatal ) return -1;
   if( size < 0 ) return 0;
 
   result = Rd_write_data( d->rdec, buffer, size );
   while( d->seeking )
     {
-    int size2, skipped = 0;
+    int size2;
+    unsigned skipped = 0;
     if( Rd_find_header( d->rdec, &skipped ) ) d->seeking = false;
     d->partial_in_size += skipped;
     if( result >= size ) break;
@@ -505,82 +517,82 @@ int LZ_decompress_write( struct LZ_Decoder * const d,
   }
 
 
-int LZ_decompress_write_size( struct LZ_Decoder * const d )
+int LZ_decompress_write_size( LZ_Decoder * const d )
   {
-  if( !verify_decoder( d ) || d->fatal ) return -1;
+  if( !check_decoder( d ) || d->fatal ) return -1;
   return Rd_free_bytes( d->rdec );
   }
 
 
-enum LZ_Errno LZ_decompress_errno( struct LZ_Decoder * const d )
+LZ_Errno LZ_decompress_errno( LZ_Decoder * const d )
   {
   if( !d ) return LZ_bad_argument;
   return d->lz_errno;
   }
 
 
-int LZ_decompress_finished( struct LZ_Decoder * const d )
+int LZ_decompress_finished( LZ_Decoder * const d )
   {
-  if( !verify_decoder( d ) ) return -1;
-  return ( Rd_finished( d->rdec ) &&
-           ( !d->lz_decoder || LZd_member_finished( d->lz_decoder ) ) );
+  if( !check_decoder( d ) || d->fatal ) return -1;
+  return Rd_finished( d->rdec ) &&
+         ( !d->lz_decoder || LZd_member_finished( d->lz_decoder ) );
   }
 
 
-int LZ_decompress_member_finished( struct LZ_Decoder * const d )
+int LZ_decompress_member_finished( LZ_Decoder * const d )
   {
-  if( !verify_decoder( d ) ) return -1;
-  return ( d->lz_decoder && LZd_member_finished( d->lz_decoder ) );
+  if( !check_decoder( d ) || d->fatal ) return -1;
+  return d->lz_decoder && LZd_member_finished( d->lz_decoder );
   }
 
 
-int LZ_decompress_member_version( struct LZ_Decoder * const d )
+int LZ_decompress_member_version( LZ_Decoder * const d )
   {
-  if( !verify_decoder( d ) ) return -1;
-  return Fh_version( d->member_header );
+  if( !check_decoder( d ) ) return -1;
+  return Lh_version( d->member_header );
   }
 
 
-int LZ_decompress_dictionary_size( struct LZ_Decoder * const d )
+int LZ_decompress_dictionary_size( LZ_Decoder * const d )
   {
-  if( !verify_decoder( d ) ) return -1;
-  return Fh_get_dictionary_size( d->member_header );
+  if( !check_decoder( d ) ) return -1;
+  return Lh_get_dictionary_size( d->member_header );
   }
 
 
-unsigned LZ_decompress_data_crc( struct LZ_Decoder * const d )
+unsigned LZ_decompress_data_crc( LZ_Decoder * const d )
   {
-  if( verify_decoder( d ) && d->lz_decoder )
+  if( check_decoder( d ) && d->lz_decoder )
     return LZd_crc( d->lz_decoder );
   return 0;
   }
 
 
-unsigned long long LZ_decompress_data_position( struct LZ_Decoder * const d )
+unsigned long long LZ_decompress_data_position( LZ_Decoder * const d )
   {
-  if( verify_decoder( d ) && d->lz_decoder )
+  if( check_decoder( d ) && d->lz_decoder )
     return LZd_data_position( d->lz_decoder );
   return 0;
   }
 
 
-unsigned long long LZ_decompress_member_position( struct LZ_Decoder * const d )
+unsigned long long LZ_decompress_member_position( LZ_Decoder * const d )
   {
-  if( !verify_decoder( d ) ) return 0;
+  if( !check_decoder( d ) ) return 0;
   return d->rdec->member_position;
   }
 
 
-unsigned long long LZ_decompress_total_in_size( struct LZ_Decoder * const d )
+unsigned long long LZ_decompress_total_in_size( LZ_Decoder * const d )
   {
-  if( !verify_decoder( d ) ) return 0;
+  if( !check_decoder( d ) ) return 0;
   return d->partial_in_size + d->rdec->member_position;
   }
 
 
-unsigned long long LZ_decompress_total_out_size( struct LZ_Decoder * const d )
+unsigned long long LZ_decompress_total_out_size( LZ_Decoder * const d )
   {
-  if( !verify_decoder( d ) ) return 0;
+  if( !check_decoder( d ) ) return 0;
   if( d->lz_decoder )
     return d->partial_out_size + LZd_data_position( d->lz_decoder );
   return d->partial_out_size;

lzlib.h

@@ -1,45 +1,42 @@
-/*  Lzlib - Compression library for the lzip format
-    Copyright (C) 2009-2016 Antonio Diaz Diaz.
+/* Lzlib - Compression library for the lzip format
+   Copyright (C) 2009-2025 Antonio Diaz Diaz.
 
-    This library is free software: you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation, either version 2 of the License, or
-    (at your option) any later version.
+   This library is free software. Redistribution and use in source and
+   binary forms, with or without modification, are permitted provided
+   that the following conditions are met:
 
-    This library is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
+   1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions, and the following disclaimer.
 
-    You should have received a copy of the GNU General Public License
-    along with this library.  If not, see <http://www.gnu.org/licenses/>.
+   2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions, and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
 
-    As a special exception, you may use this file as part of a free
-    software library without restriction.  Specifically, if other files
-    instantiate templates or use macros or inline functions from this
-    file, or you compile this file and link it with other files to
-    produce an executable, this file does not by itself cause the
-    resulting executable to be covered by the GNU General Public
-    License.  This exception does not however invalidate any other
-    reasons why the executable file might be covered by the GNU General
-    Public License.
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 */
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-#define LZ_API_VERSION 1
+/* LZ_API_VERSION was first defined in lzlib 1.8 to 1.
+   Since lzlib 1.12, LZ_API_VERSION is defined as (major * 1000 + minor). */
 
-static const char * const LZ_version_string = "1.8";
+#define LZ_API_VERSION 1015
 
-enum LZ_Errno { LZ_ok = 0,         LZ_bad_argument, LZ_mem_error,
-                LZ_sequence_error, LZ_header_error, LZ_unexpected_eof,
-                LZ_data_error,     LZ_library_error };
+static const char * const LZ_version_string = "1.15";
+
+typedef enum LZ_Errno
+  { LZ_ok = 0,         LZ_bad_argument, LZ_mem_error,
+    LZ_sequence_error, LZ_header_error, LZ_unexpected_eof,
+    LZ_data_error,     LZ_library_error } LZ_Errno;
 
 
+int LZ_api_version( void );				/* new in 1.12 */
 const char * LZ_version( void );
-const char * LZ_strerror( const enum LZ_Errno lz_errno );
+const char * LZ_strerror( const LZ_Errno lz_errno );
 
 int LZ_min_dictionary_bits( void );
 int LZ_min_dictionary_size( void );
@@ -49,65 +46,65 @@ int LZ_min_match_len_limit( void );
 int LZ_max_match_len_limit( void );
 
 
-/*---------------------- Compression Functions ----------------------*/
+/* --------------------- Compression Functions --------------------- */
 
-struct LZ_Encoder;
+typedef struct LZ_Encoder LZ_Encoder;
 
-struct LZ_Encoder * LZ_compress_open( const int dictionary_size,
-                                      const int match_len_limit,
-                                      const unsigned long long member_size );
-int LZ_compress_close( struct LZ_Encoder * const encoder );
+LZ_Encoder * LZ_compress_open( const int dictionary_size,
+                               const int match_len_limit,
+                               const unsigned long long member_size );
+int LZ_compress_close( LZ_Encoder * const encoder );
 
-int LZ_compress_finish( struct LZ_Encoder * const encoder );
-int LZ_compress_restart_member( struct LZ_Encoder * const encoder,
+int LZ_compress_finish( LZ_Encoder * const encoder );
+int LZ_compress_restart_member( LZ_Encoder * const encoder,
                                 const unsigned long long member_size );
-int LZ_compress_sync_flush( struct LZ_Encoder * const encoder );
+int LZ_compress_sync_flush( LZ_Encoder * const encoder );
 
-int LZ_compress_read( struct LZ_Encoder * const encoder,
+int LZ_compress_read( LZ_Encoder * const encoder,
                       uint8_t * const buffer, const int size );
-int LZ_compress_write( struct LZ_Encoder * const encoder,
+int LZ_compress_write( LZ_Encoder * const encoder,
                        const uint8_t * const buffer, const int size );
-int LZ_compress_write_size( struct LZ_Encoder * const encoder );
+int LZ_compress_write_size( LZ_Encoder * const encoder );
 
-enum LZ_Errno LZ_compress_errno( struct LZ_Encoder * const encoder );
-int LZ_compress_finished( struct LZ_Encoder * const encoder );
-int LZ_compress_member_finished( struct LZ_Encoder * const encoder );
+LZ_Errno LZ_compress_errno( LZ_Encoder * const encoder );
+int LZ_compress_finished( LZ_Encoder * const encoder );
+int LZ_compress_member_finished( LZ_Encoder * const encoder );
 
-unsigned long long LZ_compress_data_position( struct LZ_Encoder * const encoder );
-unsigned long long LZ_compress_member_position( struct LZ_Encoder * const encoder );
-unsigned long long LZ_compress_total_in_size( struct LZ_Encoder * const encoder );
-unsigned long long LZ_compress_total_out_size( struct LZ_Encoder * const encoder );
+unsigned long long LZ_compress_data_position( LZ_Encoder * const encoder );
+unsigned long long LZ_compress_member_position( LZ_Encoder * const encoder );
+unsigned long long LZ_compress_total_in_size( LZ_Encoder * const encoder );
+unsigned long long LZ_compress_total_out_size( LZ_Encoder * const encoder );
 
 
-/*--------------------- Decompression Functions ---------------------*/
+/* -------------------- Decompression Functions -------------------- */
 
-struct LZ_Decoder;
+typedef struct LZ_Decoder LZ_Decoder;
 
-struct LZ_Decoder * LZ_decompress_open( void );
-int LZ_decompress_close( struct LZ_Decoder * const decoder );
+LZ_Decoder * LZ_decompress_open( void );
+int LZ_decompress_close( LZ_Decoder * const decoder );
 
-int LZ_decompress_finish( struct LZ_Decoder * const decoder );
-int LZ_decompress_reset( struct LZ_Decoder * const decoder );
-int LZ_decompress_sync_to_member( struct LZ_Decoder * const decoder );
+int LZ_decompress_finish( LZ_Decoder * const decoder );
+int LZ_decompress_reset( LZ_Decoder * const decoder );
+int LZ_decompress_sync_to_member( LZ_Decoder * const decoder );
 
-int LZ_decompress_read( struct LZ_Decoder * const decoder,
+int LZ_decompress_read( LZ_Decoder * const decoder,
                         uint8_t * const buffer, const int size );
-int LZ_decompress_write( struct LZ_Decoder * const decoder,
+int LZ_decompress_write( LZ_Decoder * const decoder,
                          const uint8_t * const buffer, const int size );
-int LZ_decompress_write_size( struct LZ_Decoder * const decoder );
+int LZ_decompress_write_size( LZ_Decoder * const decoder );
 
-enum LZ_Errno LZ_decompress_errno( struct LZ_Decoder * const decoder );
-int LZ_decompress_finished( struct LZ_Decoder * const decoder );
-int LZ_decompress_member_finished( struct LZ_Decoder * const decoder );
+LZ_Errno LZ_decompress_errno( LZ_Decoder * const decoder );
+int LZ_decompress_finished( LZ_Decoder * const decoder );
+int LZ_decompress_member_finished( LZ_Decoder * const decoder );
 
-int LZ_decompress_member_version( struct LZ_Decoder * const decoder );
-int LZ_decompress_dictionary_size( struct LZ_Decoder * const decoder );
-unsigned LZ_decompress_data_crc( struct LZ_Decoder * const decoder );
+int LZ_decompress_member_version( LZ_Decoder * const decoder );
+int LZ_decompress_dictionary_size( LZ_Decoder * const decoder );
+unsigned LZ_decompress_data_crc( LZ_Decoder * const decoder );
 
-unsigned long long LZ_decompress_data_position( struct LZ_Decoder * const decoder );
-unsigned long long LZ_decompress_member_position( struct LZ_Decoder * const decoder );
-unsigned long long LZ_decompress_total_in_size( struct LZ_Decoder * const decoder );
-unsigned long long LZ_decompress_total_out_size( struct LZ_Decoder * const decoder );
+unsigned long long LZ_decompress_data_position( LZ_Decoder * const decoder );
+unsigned long long LZ_decompress_member_position( LZ_Decoder * const decoder );
+unsigned long long LZ_decompress_total_in_size( LZ_Decoder * const decoder );
+unsigned long long LZ_decompress_total_out_size( LZ_Decoder * const decoder );
 
 #ifdef __cplusplus
 }

testsuite/check.sh

@@ -1,9 +1,9 @@
 #! /bin/sh
-# check script for Lzlib - A compression library for lzip files
-# Copyright (C) 2009-2016 Antonio Diaz Diaz.
+# check script for Lzlib - Compression library for the lzip format
+# Copyright (C) 2009-2025 Antonio Diaz Diaz.
 #
 # This script is free software: you have unlimited permission
-# to copy, distribute and modify it.
+# to copy, distribute, and modify it.
 
 LC_ALL=C
 export LC_ALL
@@ -11,6 +11,7 @@ objdir=`pwd`
 testdir=`cd "$1" ; pwd`
 LZIP="${objdir}"/minilzip
 BBEXAMPLE="${objdir}"/bbexample
+FFEXAMPLE="${objdir}"/ffexample
 LZCHECK="${objdir}"/lzcheck
 framework_failure() { echo "failure in testing framework" ; exit 1 ; }
 
@@ -19,178 +20,471 @@ if [ ! -f "${LZIP}" ] || [ ! -x "${LZIP}" ] ; then
 	exit 1
 fi
 
-if [ -e "${LZIP}" ] 2> /dev/null ; then true
-else
+[ -e "${LZIP}" ] 2> /dev/null ||
+	{
 	echo "$0: a POSIX shell is required to run the tests"
 	echo "Try bash -c \"$0 $1 $2\""
 	exit 1
-fi
+	}
 
 if [ -d tmp ] ; then rm -rf tmp ; fi
 mkdir tmp
 cd "${objdir}"/tmp || framework_failure
 
-cat "${testdir}"/test.txt > in || framework_failure
+cp "${testdir}"/test.txt in || framework_failure
 in_lz="${testdir}"/test.txt.lz
-test2="${testdir}"/test2.txt
+fox_lf="${testdir}"/fox_lf
+fox_lz="${testdir}"/fox.lz
+fnz_lz="${testdir}"/fox_nz.lz
 fail=0
+test_failed() { fail=1 ; printf " $1" ; [ -z "$2" ] || printf "($2)" ; }
+
+"${LZIP}" --check-lib					# just print warning
+[ $? != 2 ] || { test_failed $LINENO ; exit 2 ; }	# unless bad lzlib.h
 
 printf "testing lzlib-%s..." "$2"
 
 "${LZIP}" -fkqm4 in
-if [ $? = 1 ] && [ ! -e in.lz ] ; then printf . ; else printf - ; fail=1 ; fi
+[ $? = 1 ] || test_failed $LINENO
+[ ! -e in.lz ] || test_failed $LINENO
 "${LZIP}" -fkqm274 in
-if [ $? = 1 ] && [ ! -e in.lz ] ; then printf . ; else printf - ; fail=1 ; fi
-"${LZIP}" -fkqs-1 in
-if [ $? = 1 ] && [ ! -e in.lz ] ; then printf . ; else printf - ; fail=1 ; fi
-"${LZIP}" -fkqs0 in
-if [ $? = 1 ] && [ ! -e in.lz ] ; then printf . ; else printf - ; fail=1 ; fi
-"${LZIP}" -fkqs4095 in
-if [ $? = 1 ] && [ ! -e in.lz ] ; then printf . ; else printf - ; fail=1 ; fi
-"${LZIP}" -fkqs513MiB in
-if [ $? = 1 ] && [ ! -e in.lz ] ; then printf . ; else printf - ; fail=1 ; fi
+[ $? = 1 ] || test_failed $LINENO
+[ ! -e in.lz ] || test_failed $LINENO
+for i in bad_size -1 0 4095 513MiB 1G 1T 1P 1E 1Z 1Y 10KB ; do
+	"${LZIP}" -fkqs $i in
+	[ $? = 1 ] || test_failed $LINENO $i
+	[ ! -e in.lz ] || test_failed $LINENO $i
+done
 "${LZIP}" -tq in
-if [ $? = 2 ] ; then printf . ; else printf - ; fail=1 ; fi
+[ $? = 2 ] || test_failed $LINENO
 "${LZIP}" -tq < in
-if [ $? = 2 ] ; then printf . ; else printf - ; fail=1 ; fi
+[ $? = 2 ] || test_failed $LINENO
 "${LZIP}" -cdq in
-if [ $? = 2 ] ; then printf . ; else printf - ; fail=1 ; fi
+[ $? = 2 ] || test_failed $LINENO
 "${LZIP}" -cdq < in
-if [ $? = 2 ] ; then printf . ; else printf - ; fail=1 ; fi
-dd if="${in_lz}" bs=1 count=6 2> /dev/null | "${LZIP}" -tq
-if [ $? = 2 ] ; then printf . ; else printf - ; fail=1 ; fi
-dd if="${in_lz}" bs=1 count=20 2> /dev/null | "${LZIP}" -tq
-if [ $? = 2 ] ; then printf . ; else printf - ; fail=1 ; fi
+[ $? = 2 ] || test_failed $LINENO
+"${LZIP}" -dq -o in < "${in_lz}"
+[ $? = 1 ] || test_failed $LINENO
+"${LZIP}" -dq -o in "${in_lz}"
+[ $? = 1 ] || test_failed $LINENO
+"${LZIP}" -dq -o out nx_file.lz
+[ $? = 1 ] || test_failed $LINENO
+[ ! -e out ] || test_failed $LINENO
+"${LZIP}" -q -o out.lz nx_file
+[ $? = 1 ] || test_failed $LINENO
+[ ! -e out.lz ] || test_failed $LINENO
+"${LZIP}" -qf -S100k -o out in in	# only one file with -o and -S
+[ $? = 1 ] || test_failed $LINENO
+{ [ ! -e out ] && [ ! -e out.lz ] ; } || test_failed $LINENO
+# these are for code coverage
+"${LZIP}" -cdt "${in_lz}" 2> /dev/null
+[ $? = 1 ] || test_failed $LINENO
+"${LZIP}" -t -- nx_file.lz 2> /dev/null
+[ $? = 1 ] || test_failed $LINENO
+"${LZIP}" -t "" < /dev/null 2> /dev/null
+[ $? = 1 ] || test_failed $LINENO
+"${LZIP}" --help > /dev/null || test_failed $LINENO
+"${LZIP}" -n1 -V > /dev/null || test_failed $LINENO
+"${LZIP}" -m 2> /dev/null
+[ $? = 1 ] || test_failed $LINENO
+"${LZIP}" -z 2> /dev/null
+[ $? = 1 ] || test_failed $LINENO
+"${LZIP}" --bad_option 2> /dev/null
+[ $? = 1 ] || test_failed $LINENO
+"${LZIP}" --t 2> /dev/null
+[ $? = 1 ] || test_failed $LINENO
+"${LZIP}" --test=2 2> /dev/null
+[ $? = 1 ] || test_failed $LINENO
+"${LZIP}" --output= 2> /dev/null
+[ $? = 1 ] || test_failed $LINENO
+"${LZIP}" --output 2> /dev/null
+[ $? = 1 ] || test_failed $LINENO
+printf "LZIP\001-.............................." | "${LZIP}" -t 2> /dev/null
+printf "LZIP\002-.............................." | "${LZIP}" -t 2> /dev/null
+printf "LZIP\001+.............................." | "${LZIP}" -t 2> /dev/null
 
 printf "\ntesting decompression..."
 
-"${LZIP}" -t "${in_lz}"
-if [ $? = 0 ] ; then printf . ; else printf - ; fail=1 ; fi
-"${LZIP}" -cd "${in_lz}" > copy || fail=1
-cmp in copy || fail=1
-printf .
+for i in "${in_lz}" "${testdir}"/test_sync.lz ; do
+	"${LZIP}" -t "$i" || test_failed $LINENO "$i"
+	"${LZIP}" -d "$i" -o out || test_failed $LINENO "$i"
+	cmp in out || test_failed $LINENO "$i"
+	"${LZIP}" -cd "$i" > out || test_failed $LINENO "$i"
+	cmp in out || test_failed $LINENO "$i"
+	"${LZIP}" -d "$i" -o - > out || test_failed $LINENO "$i"
+	cmp in out || test_failed $LINENO "$i"
+	"${LZIP}" -d < "$i" > out || test_failed $LINENO "$i"
+	cmp in out || test_failed $LINENO "$i"
+	rm -f out || framework_failure
+done
 
-"${LZIP}" -t "${testdir}"/test_sync.lz
-if [ $? = 0 ] ; then printf . ; else printf - ; fail=1 ; fi
-"${LZIP}" -cd "${testdir}"/test_sync.lz > copy || fail=1
-cmp in copy || fail=1
-printf .
+cp "${in_lz}" out.lz || framework_failure
+"${LZIP}" -dk out.lz || test_failed $LINENO
+cmp in out || test_failed $LINENO
+rm -f out || framework_failure
+"${LZIP}" -cd "${fox_lz}" > fox || test_failed $LINENO
+cp fox copy || framework_failure
+cp "${in_lz}" copy.lz || framework_failure
+"${LZIP}" -d copy.lz out.lz 2> /dev/null	# skip copy, decompress out
+[ $? = 1 ] || test_failed $LINENO
+[ ! -e out.lz ] || test_failed $LINENO
+cmp fox copy || test_failed $LINENO
+cmp in out || test_failed $LINENO
+"${LZIP}" -df copy.lz || test_failed $LINENO
+[ ! -e copy.lz ] || test_failed $LINENO
+cmp in copy || test_failed $LINENO
+rm -f copy out || framework_failure
 
-rm -f copy
-cat "${in_lz}" > copy.lz || framework_failure
-"${LZIP}" -dk copy.lz || fail=1
-cmp in copy || fail=1
-printf "to be overwritten" > copy || framework_failure
-"${LZIP}" -dq copy.lz
-if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
-"${LZIP}" -df copy.lz
-if [ $? = 0 ] && [ ! -e copy.lz ] && cmp in copy ; then
-	printf . ; else printf - ; fail=1 ; fi
+cp "${in_lz}" out.lz || framework_failure
+"${LZIP}" -d -S100k out.lz || test_failed $LINENO	# ignore -S
+[ ! -e out.lz ] || test_failed $LINENO
+cmp in out || test_failed $LINENO
 
-printf "to be overwritten" > copy || framework_failure
-"${LZIP}" -df -o copy < "${in_lz}" || fail=1
-cmp in copy || fail=1
-printf .
+printf "to be overwritten" > out || framework_failure
+"${LZIP}" -df -o out < "${in_lz}" || test_failed $LINENO
+cmp in out || test_failed $LINENO
+"${LZIP}" -d -o ./- "${in_lz}" || test_failed $LINENO
+cmp in ./- || test_failed $LINENO
+rm -f ./- || framework_failure
+"${LZIP}" -d -o ./- < "${in_lz}" || test_failed $LINENO
+cmp in ./- || test_failed $LINENO
+rm -f ./- || framework_failure
 
-rm -f copy
-"${LZIP}" -s16 < in > anyothername || fail=1
-"${LZIP}" -d -o copy - anyothername - < "${in_lz}"
-if [ $? = 0 ] && cmp in copy && cmp in anyothername.out ; then
-	printf . ; else printf - ; fail=1 ; fi
-rm -f copy anyothername.out
+cp "${in_lz}" anyothername || framework_failure
+"${LZIP}" -dv - anyothername - < "${in_lz}" > out 2> /dev/null ||
+	test_failed $LINENO
+cmp in out || test_failed $LINENO
+cmp in anyothername.out || test_failed $LINENO
+rm -f anyothername.out || framework_failure
 
 "${LZIP}" -tq in "${in_lz}"
-if [ $? = 2 ] ; then printf . ; else printf - ; fail=1 ; fi
-"${LZIP}" -tq foo.lz "${in_lz}"
-if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
-"${LZIP}" -cdq in "${in_lz}" > copy
-if [ $? = 2 ] && cat copy in | cmp in - ; then printf . ; else printf - ; fail=1 ; fi
-"${LZIP}" -cdq foo.lz "${in_lz}" > copy
-if [ $? = 1 ] && cmp in copy ; then printf . ; else printf - ; fail=1 ; fi
-rm -f copy
-cat "${in_lz}" > copy.lz || framework_failure
-"${LZIP}" -dq in copy.lz
-if [ $? = 2 ] && [ -e copy.lz ] && [ ! -e copy ] && [ ! -e in.out ] ; then
-	printf . ; else printf - ; fail=1 ; fi
-"${LZIP}" -dq foo.lz copy.lz
-if [ $? = 1 ] && [ ! -e copy.lz ] && [ ! -e foo ] && cmp in copy ; then
-	printf . ; else printf - ; fail=1 ; fi
+[ $? = 2 ] || test_failed $LINENO
+"${LZIP}" -tq nx_file.lz "${in_lz}"
+[ $? = 1 ] || test_failed $LINENO
+"${LZIP}" -cdq in "${in_lz}" > out
+[ $? = 2 ] || test_failed $LINENO
+cat out in | cmp in - || test_failed $LINENO		# out must be empty
+"${LZIP}" -cdq nx_file.lz "${in_lz}" > out	# skip nx_file, decompress in
+[ $? = 1 ] || test_failed $LINENO
+cmp in out || test_failed $LINENO
+rm -f out || framework_failure
+cp "${in_lz}" out.lz || framework_failure
+for i in 1 2 3 4 5 6 7 ; do
+	printf "g" >> out.lz || framework_failure
+	"${LZIP}" -atvvvv out.lz "${in_lz}" 2> /dev/null
+	[ $? = 2 ] || test_failed $LINENO $i
+done
+"${LZIP}" -dq in out.lz
+[ $? = 2 ] || test_failed $LINENO
+[ -e out.lz ] || test_failed $LINENO
+[ ! -e out ] || test_failed $LINENO
+[ ! -e in.out ] || test_failed $LINENO
+"${LZIP}" -dq nx_file.lz out.lz
+[ $? = 1 ] || test_failed $LINENO
+[ ! -e out.lz ] || test_failed $LINENO
+[ ! -e nx_file ] || test_failed $LINENO
+cmp in out || test_failed $LINENO
+rm -f out || framework_failure
 
 cat in in > in2 || framework_failure
-"${LZIP}" -s16 -o copy2 < in2 || fail=1
-"${LZIP}" -t copy2.lz || fail=1
-"${LZIP}" -cd copy2.lz > copy2 || fail=1
-cmp in2 copy2 || fail=1
-printf .
+"${LZIP}" -t "${in_lz}" "${in_lz}" || test_failed $LINENO
+"${LZIP}" -cd "${in_lz}" "${in_lz}" -o out > out2 || test_failed $LINENO
+[ ! -e out ] || test_failed $LINENO			# override -o
+cmp in2 out2 || test_failed $LINENO
+rm -f out2 || framework_failure
+"${LZIP}" -d "${in_lz}" "${in_lz}" -o out2 || test_failed $LINENO
+cmp in2 out2 || test_failed $LINENO
+rm -f out2 || framework_failure
 
-printf "garbage" >> copy2.lz || framework_failure
-rm -f copy2
-"${LZIP}" -atq copy2.lz
-if [ $? = 2 ] ; then printf . ; else printf - ; fail=1 ; fi
-"${LZIP}" -atq < copy2.lz
-if [ $? = 2 ] ; then printf . ; else printf - ; fail=1 ; fi
-"${LZIP}" -adkq copy2.lz
-if [ $? = 2 ] && [ ! -e copy2 ] ; then printf . ; else printf - ; fail=1 ; fi
-"${LZIP}" -adkq -o copy2 < copy2.lz
-if [ $? = 2 ] && [ ! -e copy2 ] ; then printf . ; else printf - ; fail=1 ; fi
-printf "to be overwritten" > copy2 || framework_failure
-"${LZIP}" -df copy2.lz || fail=1
-cmp in2 copy2 || fail=1
-printf .
+cat "${in_lz}" "${in_lz}" > out2.lz || framework_failure
+lines=`"${LZIP}" -tvv out2.lz 2>&1 | wc -l` || test_failed $LINENO
+[ "${lines}" -eq 2 ] || test_failed $LINENO "${lines}"
+
+printf "\ngarbage" >> out2.lz || framework_failure
+"${LZIP}" -tvvvv out2.lz 2> /dev/null || test_failed $LINENO
+"${LZIP}" -atq out2.lz
+[ $? = 2 ] || test_failed $LINENO
+"${LZIP}" -atq < out2.lz
+[ $? = 2 ] || test_failed $LINENO
+"${LZIP}" -adkq out2.lz
+[ $? = 2 ] || test_failed $LINENO
+[ ! -e out2 ] || test_failed $LINENO
+"${LZIP}" -adkq -o out2 < out2.lz
+[ $? = 2 ] || test_failed $LINENO
+[ ! -e out2 ] || test_failed $LINENO
+printf "to be overwritten" > out2 || framework_failure
+"${LZIP}" -df out2.lz || test_failed $LINENO
+cmp in2 out2 || test_failed $LINENO
+rm -f out2 || framework_failure
+
+touch empty em || framework_failure
+"${LZIP}" -0 em || test_failed $LINENO
+"${LZIP}" -dk em.lz || test_failed $LINENO
+cmp empty em || test_failed $LINENO
+cat em.lz em.lz | "${LZIP}" -t || test_failed $LINENO
+cat em.lz em.lz | "${LZIP}" -d > em || test_failed $LINENO
+cmp empty em || test_failed $LINENO
+cat em.lz "${in_lz}" | "${LZIP}" -t || test_failed $LINENO
+cat em.lz "${in_lz}" | "${LZIP}" -d > out || test_failed $LINENO
+cmp in out || test_failed $LINENO
+cat "${in_lz}" em.lz | "${LZIP}" -t || test_failed $LINENO
+cat "${in_lz}" em.lz | "${LZIP}" -d > out || test_failed $LINENO
+cmp in out || test_failed $LINENO
 
 printf "\ntesting   compression..."
 
-"${LZIP}" -cfq "${in_lz}" > out			# /dev/null is a tty on OS/2
-if [ $? = 1 ] ; then printf . ; else printf - ; fail=1 ; fi
-"${LZIP}" -cF -s16 "${in_lz}" > out || fail=1
-"${LZIP}" -cd out | "${LZIP}" -d > copy || fail=1
-cmp in copy || fail=1
-printf .
+"${LZIP}" -c -0 in in in -S100k -o out3.lz > copy2.lz || test_failed $LINENO
+[ ! -e out3.lz ] || test_failed $LINENO			# override -o and -S
+"${LZIP}" -0f in in --output=copy2.lz || test_failed $LINENO
+"${LZIP}" -d copy2.lz -o out2 || test_failed $LINENO
+[ -e copy2.lz ] || test_failed $LINENO
+cmp in2 out2 || test_failed $LINENO
+rm -f copy2.lz || framework_failure
+
+"${LZIP}" -cf "${in_lz}" > lzlz 2> /dev/null	# /dev/null is a tty on OS/2
+[ $? = 1 ] || test_failed $LINENO
+"${LZIP}" -Fvvm36 -o - -s16 "${in_lz}" > lzlz 2> /dev/null || test_failed $LINENO
+"${LZIP}" -cd lzlz | "${LZIP}" -d > out || test_failed $LINENO
+cmp in out || test_failed $LINENO
+rm -f lzlz out || framework_failure
+
+"${LZIP}" -0 -o ./- in || test_failed $LINENO
+"${LZIP}" -cd ./- | cmp in - || test_failed $LINENO
+rm -f ./- || framework_failure
+"${LZIP}" -0 -o ./- < in || test_failed $LINENO		# don't add .lz
+[ ! -e ./-.lz ] || test_failed $LINENO
+"${LZIP}" -cd ./- | cmp in - || test_failed $LINENO
+rm -f ./- || framework_failure
 
 for i in s4Ki 0 1 2 3 4 5 6 7 8 9 ; do
-	"${LZIP}" -k -$i -s16 in || fail=1
-	mv -f in.lz copy.lz || fail=1
-	printf "garbage" >> copy.lz || fail=1
-	"${LZIP}" -df copy.lz || fail=1
-	cmp in copy || fail=1
+	"${LZIP}" -k -$i -s16 in || test_failed $LINENO $i
+	mv in.lz out.lz || test_failed $LINENO $i
+	printf "garbage" >> out.lz || framework_failure
+	"${LZIP}" -df out.lz || test_failed $LINENO $i
+	cmp in out || test_failed $LINENO $i
+
+	"${LZIP}" -$i -s16 in -c > out || test_failed $LINENO $i
+	"${LZIP}" -$i -s16 in -o o_out || test_failed $LINENO $i # don't add .lz
+	[ ! -e o_out.lz ] || test_failed $LINENO
+	cmp out o_out || test_failed $LINENO $i
+	rm -f o_out || framework_failure
+	printf "g" >> out || framework_failure
+	"${LZIP}" -cd out > copy || test_failed $LINENO $i
+	cmp in copy || test_failed $LINENO $i
+
+	"${LZIP}" -$i -s16 < in > out || test_failed $LINENO $i
+	"${LZIP}" -d < out > copy || test_failed $LINENO $i
+	cmp in copy || test_failed $LINENO $i
+
+	rm -f out.lz || framework_failure
+	printf "to be overwritten" > out || framework_failure
+	"${LZIP}" -f -$i -s16 -o out < in || test_failed $LINENO $i # don't add .lz
+	[ ! -e out.lz ] || test_failed $LINENO
+	"${LZIP}" -df -o copy < out || test_failed $LINENO $i
+	cmp in copy || test_failed $LINENO $i
 done
-printf .
+rm -f copy out || framework_failure
 
-for i in s4Ki 0 1 2 3 4 5 6 7 8 9 ; do
-	"${LZIP}" -c -$i -s16 in > out || fail=1
-	printf "g" >> out || fail=1
-	"${LZIP}" -cd out > copy || fail=1
-	cmp in copy || fail=1
+cat in in in in in in in in > in8 || framework_failure
+"${LZIP}" -1s12 -S100k in8 || test_failed $LINENO
+"${LZIP}" -t in800001.lz in800002.lz || test_failed $LINENO
+"${LZIP}" -cd in800001.lz in800002.lz | cmp in8 - || test_failed $LINENO
+[ ! -e in800003.lz ] || test_failed $LINENO
+rm -f in800001.lz in800002.lz || framework_failure
+"${LZIP}" -1s12 -S100k -o out.lz in8 || test_failed $LINENO
+# ignore -S
+"${LZIP}" -d out.lz00001.lz out.lz00002.lz -S100k -o out || test_failed $LINENO
+cmp in8 out || test_failed $LINENO
+"${LZIP}" -t out.lz00001.lz out.lz00002.lz || test_failed $LINENO
+[ ! -e out.lz00003.lz ] || test_failed $LINENO
+rm -f out out.lz00001.lz out.lz00002.lz || framework_failure
+"${LZIP}" -1ks4Ki -b100000 in8 || test_failed $LINENO
+"${LZIP}" -t in8.lz || test_failed $LINENO
+"${LZIP}" -cd in8.lz -o out | cmp in8 - || test_failed $LINENO	# override -o
+[ ! -e out ] || test_failed $LINENO
+"${LZIP}" -0 -S100k -o out < in8.lz || test_failed $LINENO
+"${LZIP}" -t out00001.lz out00002.lz || test_failed $LINENO
+"${LZIP}" -cd out00001.lz out00002.lz | cmp in8.lz - || test_failed $LINENO
+[ ! -e out00003.lz ] || test_failed $LINENO
+rm -f out00001.lz out00002.lz || framework_failure
+"${LZIP}" -1 -S100k -o out < in8.lz || test_failed $LINENO
+"${LZIP}" -t out00001.lz out00002.lz || test_failed $LINENO
+"${LZIP}" -cd out00001.lz out00002.lz | cmp in8.lz - || test_failed $LINENO
+[ ! -e out00003.lz ] || test_failed $LINENO
+rm -f out00001.lz out00002.lz || framework_failure
+"${LZIP}" -0 -F -S100k in8.lz || test_failed $LINENO
+"${LZIP}" -t in8.lz00001.lz in8.lz00002.lz || test_failed $LINENO
+"${LZIP}" -cd in8.lz00001.lz in8.lz00002.lz | cmp in8.lz - || test_failed $LINENO
+[ ! -e in8.lz00003.lz ] || test_failed $LINENO
+rm -f in8.lz00001.lz in8.lz00002.lz || framework_failure
+"${LZIP}" -0kF -b100k in8.lz || test_failed $LINENO
+"${LZIP}" -t in8.lz.lz || test_failed $LINENO
+"${LZIP}" -cd in8.lz.lz | cmp in8.lz - || test_failed $LINENO
+rm -f in8.lz in8.lz.lz || framework_failure
+
+"${BBEXAMPLE}" in || test_failed $LINENO
+"${BBEXAMPLE}" "${in_lz}" || test_failed $LINENO
+"${BBEXAMPLE}" "${fox_lf}" || test_failed $LINENO
+
+"${FFEXAMPLE}" -h > /dev/null || test_failed $LINENO
+"${FFEXAMPLE}" > /dev/null
+[ $? = 1 ] || test_failed $LINENO
+rm -f out || framework_failure
+"${FFEXAMPLE}" -b in out || test_failed $LINENO
+cmp in out || test_failed $LINENO
+"${FFEXAMPLE}" -b in | cmp in - || test_failed $LINENO
+"${FFEXAMPLE}" -b in8 | cmp in8 - || test_failed $LINENO
+"${FFEXAMPLE}" -b "${fox_lf}" | cmp "${fox_lf}" - || test_failed $LINENO
+"${FFEXAMPLE}" -d "${in_lz}" - | cmp in - || test_failed $LINENO
+"${FFEXAMPLE}" -c in | "${FFEXAMPLE}" -d | cmp in - || test_failed $LINENO
+"${FFEXAMPLE}" -m in | "${FFEXAMPLE}" -d | cmp in - || test_failed $LINENO
+"${FFEXAMPLE}" -l in | "${FFEXAMPLE}" -d | cmp in - || test_failed $LINENO
+cat "${fox_lf}" "${in_lz}" | "${FFEXAMPLE}" -r | cmp in - || test_failed $LINENO
+cat in8 "${in_lz}" | "${FFEXAMPLE}" -r | cmp in - || test_failed $LINENO
+cat "${in_lz}" "${fox_lf}" "${in_lz}" | "${FFEXAMPLE}" -r - | cmp in2 - ||
+	test_failed $LINENO
+cat "${in_lz}" in8 "${in_lz}" | "${FFEXAMPLE}" -r - - | cmp in2 - ||
+	test_failed $LINENO
+
+"${LZCHECK}" in || test_failed $LINENO
+"${LZCHECK}" "${in_lz}" || test_failed $LINENO
+"${LZCHECK}" "${fox_lf}" || test_failed $LINENO
+rm -f in8 || framework_failure
+
+printf "\ntesting bad input..."
+
+cat em.lz em.lz > ee.lz || framework_failure
+"${LZIP}" -t < ee.lz || test_failed $LINENO
+"${LZIP}" -d < ee.lz > em || test_failed $LINENO
+cmp empty em || test_failed $LINENO
+"${LZIP}" -tq ee.lz
+[ $? = 2 ] || test_failed $LINENO
+"${LZIP}" -dq ee.lz
+[ $? = 2 ] || test_failed $LINENO
+[ ! -e ee ] || test_failed $LINENO
+"${LZIP}" -cdq ee.lz > em
+[ $? = 2 ] || test_failed $LINENO
+cmp empty em || test_failed $LINENO
+rm -f empty em || framework_failure
+cat "${in_lz}" em.lz "${in_lz}" > inein.lz || framework_failure
+"${LZIP}" -t < inein.lz || test_failed $LINENO
+"${LZIP}" -d < inein.lz > out2 || test_failed $LINENO
+cmp in2 out2 || test_failed $LINENO
+"${LZIP}" -tq inein.lz
+[ $? = 2 ] || test_failed $LINENO
+"${LZIP}" -dq inein.lz
+[ $? = 2 ] || test_failed $LINENO
+[ ! -e inein ] || test_failed $LINENO
+"${LZIP}" -cdq inein.lz > out2
+[ $? = 2 ] || test_failed $LINENO
+cmp in2 out2 || test_failed $LINENO
+rm -f out2 inein.lz em.lz || framework_failure
+
+headers='LZIp LZiP LZip LzIP LzIp LziP lZIP lZIp lZiP lzIP'
+body='\001\014\000\000\101\376\367\377\377\340\000\200\000\215\357\002\322\001\000\000\000\000\000\000\000\045\000\000\000\000\000\000\000'
+cp "${in_lz}" int.lz || framework_failure
+printf "LZIP${body}" >> int.lz || framework_failure
+if "${LZIP}" -t int.lz ; then
+	for header in ${headers} ; do
+		printf "${header}${body}" > int.lz || framework_failure
+		"${LZIP}" -tq int.lz			# first member
+		[ $? = 2 ] || test_failed $LINENO ${header}
+		"${LZIP}" -tq < int.lz
+		[ $? = 2 ] || test_failed $LINENO ${header}
+		"${LZIP}" -cdq int.lz > /dev/null
+		[ $? = 2 ] || test_failed $LINENO ${header}
+		"${LZIP}" -tq --loose-trailing int.lz
+		[ $? = 2 ] || test_failed $LINENO ${header}
+		"${LZIP}" -tq --loose-trailing < int.lz
+		[ $? = 2 ] || test_failed $LINENO ${header}
+		"${LZIP}" -cdq --loose-trailing int.lz > /dev/null
+		[ $? = 2 ] || test_failed $LINENO ${header}
+		cp "${in_lz}" int.lz || framework_failure
+		printf "${header}${body}" >> int.lz || framework_failure
+		"${LZIP}" -tq int.lz			# trailing data
+		[ $? = 2 ] || test_failed $LINENO ${header}
+		"${LZIP}" -tq < int.lz
+		[ $? = 2 ] || test_failed $LINENO ${header}
+		"${LZIP}" -cdq int.lz > /dev/null
+		[ $? = 2 ] || test_failed $LINENO ${header}
+		"${LZIP}" -t --loose-trailing int.lz ||
+			test_failed $LINENO ${header}
+		"${LZIP}" -t --loose-trailing < int.lz ||
+			test_failed $LINENO ${header}
+		"${LZIP}" -cd --loose-trailing int.lz > /dev/null ||
+			test_failed $LINENO ${header}
+		"${LZIP}" -tq --loose-trailing --trailing-error int.lz
+		[ $? = 2 ] || test_failed $LINENO ${header}
+		"${LZIP}" -tq --loose-trailing --trailing-error < int.lz
+		[ $? = 2 ] || test_failed $LINENO ${header}
+		"${LZIP}" -cdq --loose-trailing --trailing-error int.lz > /dev/null
+		[ $? = 2 ] || test_failed $LINENO ${header}
+	done
+else
+	printf "warning: skipping header test: 'printf' does not work on your system."
+fi
+rm -f int.lz || framework_failure
+
+"${LZIP}" -tq "${fnz_lz}"
+[ $? = 2 ] || test_failed $LINENO
+
+for i in fox_v2.lz fox_s11.lz fox_de20.lz \
+         fox_bcrc.lz fox_crc0.lz fox_das46.lz fox_mes81.lz ; do
+	"${LZIP}" -tq "${testdir}"/$i
+	[ $? = 2 ] || test_failed $LINENO $i
 done
-printf .
 
-for i in s4Ki 0 1 2 3 4 5 6 7 8 9 ; do
-	"${LZIP}" -$i -s16 < in > out || fail=1
-	"${LZIP}" -d < out > copy || fail=1
-	cmp in copy || fail=1
+for i in fox_bcrc.lz fox_crc0.lz fox_das46.lz fox_mes81.lz ; do
+	"${LZIP}" -cdq "${testdir}"/$i > out
+	[ $? = 2 ] || test_failed $LINENO $i
+	cmp fox out || test_failed $LINENO $i
 done
-printf .
+rm -f fox || framework_failure
 
-for i in s4Ki 0 1 2 3 4 5 6 7 8 9 ; do
-	"${LZIP}" -f -$i -s16 -o out < in || fail=1
-	"${LZIP}" -df -o copy < out.lz || fail=1
-	cmp in copy || fail=1
-done
-printf .
+cat "${in_lz}" "${in_lz}" > in2.lz || framework_failure
+cat "${in_lz}" "${in_lz}" "${in_lz}" > in3.lz || framework_failure
+if dd if=in3.lz of=trunc.lz bs=14682 count=1 2> /dev/null &&
+   [ -e trunc.lz ] && cmp in2.lz trunc.lz ; then
+	for i in 6 20 14664 14683 14684 14685 14686 14687 14688 ; do
+		dd if=in3.lz of=trunc.lz bs=$i count=1 2> /dev/null
+		"${LZIP}" -tq trunc.lz
+		[ $? = 2 ] || test_failed $LINENO $i
+		"${LZIP}" -tq < trunc.lz
+		[ $? = 2 ] || test_failed $LINENO $i
+		"${LZIP}" -cdq trunc.lz > /dev/null
+		[ $? = 2 ] || test_failed $LINENO $i
+		"${LZIP}" -dq < trunc.lz > /dev/null
+		[ $? = 2 ] || test_failed $LINENO $i
+	done
+else
+	printf "warning: skipping truncation test: 'dd' does not work on your system."
+fi
+rm -f in2.lz in3.lz trunc.lz || framework_failure
 
-"${BBEXAMPLE}" in || fail=1
-printf .
-"${BBEXAMPLE}" out || fail=1
-printf .
-"${BBEXAMPLE}" ${test2} || fail=1
-printf .
-
-"${LZCHECK}" in || fail=1
-printf .
-"${LZCHECK}" out || fail=1
-printf .
-"${LZCHECK}" ${test2} || fail=1
-printf .
+cp "${in_lz}" ingin.lz || framework_failure
+printf "g" >> ingin.lz || framework_failure
+cat "${in_lz}" >> ingin.lz || framework_failure
+"${LZIP}" -atq ingin.lz
+[ $? = 2 ] || test_failed $LINENO
+"${LZIP}" -atq < ingin.lz
+[ $? = 2 ] || test_failed $LINENO
+"${LZIP}" -acdq ingin.lz > out
+[ $? = 2 ] || test_failed $LINENO
+cmp in out || test_failed $LINENO
+"${LZIP}" -adq < ingin.lz > out
+[ $? = 2 ] || test_failed $LINENO
+cmp in out || test_failed $LINENO
+"${LZIP}" -t ingin.lz || test_failed $LINENO
+"${LZIP}" -t < ingin.lz || test_failed $LINENO
+"${LZIP}" -dk ingin.lz || test_failed $LINENO
+cmp in ingin || test_failed $LINENO
+"${LZIP}" -cd ingin.lz > out || test_failed $LINENO
+cmp in out || test_failed $LINENO
+"${LZIP}" -d < ingin.lz > out || test_failed $LINENO
+cmp in out || test_failed $LINENO
+"${FFEXAMPLE}" -d ingin.lz | cmp in - || test_failed $LINENO
+"${FFEXAMPLE}" -r ingin.lz | cmp in2 - || test_failed $LINENO
+rm -f in2 out ingin ingin.lz || framework_failure
 
 echo
 if [ ${fail} = 0 ] ; then

testsuite/test.txt

@@ -1,8 +1,7 @@
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 
- Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
- 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc. <http://fsf.org/>
  Everyone is permitted to copy and distribute verbatim copies
  of this license document, but changing it is not allowed.
 
@@ -339,8 +338,7 @@ Public License instead of this License.
                     GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 
- Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
- 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc. <http://fsf.org/>
  Everyone is permitted to copy and distribute verbatim copies
  of this license document, but changing it is not allowed.