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Merging upstream version 0.8.

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Signed-off-by: Daniel Baumann <daniel@debian.org>
This commit is contained in:
Daniel Baumann 2025-02-17 21:10:01 +01:00
parent c7152715b0
commit d91c44b5bd
Signed by: daniel
GPG key ID: FBB4F0E80A80222F
28 changed files with 2668 additions and 574 deletions
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36
ChangeLog
View file

@ -1,3 +1,39 @@
2018-12-16 Antonio Diaz Diaz <antonio@gnu.org>
* Version 0.8 released.
* Added new option '--anonymous' (--owner=root --group=root).
* extract.cc (decode): 'tarlz -xf foo ./bar' now extracts 'bar'.
* create.cc: Set to zero most fields in extended headers.
* tarlz.texi: Added new chapter 'Amendments to pax format'.
2018-11-23 Antonio Diaz Diaz <antonio@gnu.org>
* Version 0.7 released.
* Added new option '--keep-damaged'.
* Added new option '--no-solid'.
* create.cc (archive_write): Minimize dictionary size.
* create.cc: Detect and skip archive in '-A', '-c' and '-r'.
* main.cc (show_version): Show the version of lzlib being used.
2018-10-19 Antonio Diaz Diaz <antonio@gnu.org>
* Version 0.6 released.
* Added new option '-A, --concatenate'.
* Option '--ignore-crc' replaced with '--missing-crc'.
* create.cc (add_member): Test that uid, gid, mtime, devmajor
and devminor are in ustar range.
* configure: Accept appending to CXXFLAGS, 'CXXFLAGS+=OPTIONS'.
* Makefile.in: Use tarlz in target 'dist'.
2018-09-29 Antonio Diaz Diaz <antonio@gnu.org>
* Version 0.5 released.
* Implemented simplified posix pax format.
* Implemented CRC32-C (Castagnoli) of the extended header data.
* Added new option '--ignore-crc'.
* Added missing #includes for major, minor and makedev.
* tarlz.texi: Documented the new archive format.
2018-04-23 Antonio Diaz Diaz <antonio@gnu.org>
* Version 0.4 released.

7
INSTALL
View file

@ -3,6 +3,9 @@ Requirements
You will need a C++ compiler and the lzlib compression library installed.
I use gcc 5.3.0 and 4.1.2, but the code should compile with any
standards compliant compiler.
Lzlib must be version 1.0 or newer, but --keep-damaged requires lzlib
1.11-rc2 or newer to recover as much data as possible from each damaged
member.
Gcc is available at http://gcc.gnu.org.
Lzlib is available at http://www.nongnu.org/lzip/lzlib.html.
@ -24,6 +27,10 @@ the main archive.
cd tarlz[version]
./configure
To link against a lzlib not installed in a standard place, use:
./configure CPPFLAGS='-I<dir_of_lzlib.h>' LDFLAGS='-L<dir_of_liblz.a>'
3. Run make.
make

13
Makefile.in
View file

@ -101,7 +101,7 @@ uninstall-man :
dist : doc
ln -sf $(VPATH) $(DISTNAME)
tar -Hustar --owner=root --group=root -cvf $(DISTNAME).tar \
tarlz --solid --owner=root --group=root -9cvf $(DISTNAME).tar.lz \
$(DISTNAME)/AUTHORS \
$(DISTNAME)/COPYING \
$(DISTNAME)/ChangeLog \
@ -118,17 +118,24 @@ dist : doc
$(DISTNAME)/testsuite/check.sh \
$(DISTNAME)/testsuite/test.txt \
$(DISTNAME)/testsuite/test.txt.tar \
$(DISTNAME)/testsuite/test_bad1.txt.tar \
$(DISTNAME)/testsuite/test_bad[12].txt \
$(DISTNAME)/testsuite/t155.tar \
$(DISTNAME)/testsuite/test3.tar \
$(DISTNAME)/testsuite/test3_bad[1-5].tar \
$(DISTNAME)/testsuite/test.txt.lz \
$(DISTNAME)/testsuite/test.txt.tar.lz \
$(DISTNAME)/testsuite/test_bad[12].txt.tar.lz \
$(DISTNAME)/testsuite/test3.tar.lz \
$(DISTNAME)/testsuite/test3a.tar.lz \
$(DISTNAME)/testsuite/tlz_in_tar[12].tar \
$(DISTNAME)/testsuite/test3_dir.tar.lz \
$(DISTNAME)/testsuite/test3_dot.tar.lz \
$(DISTNAME)/testsuite/t155.tar.lz \
$(DISTNAME)/testsuite/test3_bad[1-6].tar.lz \
$(DISTNAME)/testsuite/dotdot[1-5].tar.lz \
$(DISTNAME)/testsuite/ug32chars.tar.lz \
$(DISTNAME)/testsuite/eof.tar.lz
rm -f $(DISTNAME)
lzip -v -9 $(DISTNAME).tar
clean :
-rm -f $(progname) $(objs)

19
NEWS
View file

@ -1,5 +1,18 @@
Changes in version 0.4:
Changes in version 0.8:
Some missing #includes have been fixed.
The new option '--anonymous', equivalent to '--owner=root --group=root', has
been added.
Open files in binary mode on OS2.
On extraction and listing, tarlz now removes leading './' strings also from
member names given in the command line. 'tarlz -xf foo ./bar' now extracts
member 'bar' from archive 'foo'. (Reported by Viktor Sergiienko in the
bug-tar mailing list).
Tarlz now writes extended headers with all fields zeroed except size,
chksum, typeflag, magic and version. This prevents old tar programs from
extracting the extended records as a file in the wrong place (with a
truncated filename). Tarlz now also sets to zero those fields of the ustar
header overridden by extended records.
The chapter 'Amendments to pax format', explaining the reasons for the
differences with the pax format, has been added.

77
README
View file

@ -1,36 +1,16 @@
Description
Tarlz is a small and simple implementation of the tar archiver. By
default tarlz creates, lists and extracts archives in the 'ustar' format
compressed with lzip on a per file basis. Tarlz can append files to the
end of such compressed archives.
Each tar member is compressed in its own lzip member, as well as the
end-of-file blocks. This same method works for any tar format (gnu,
ustar, posix) and is fully backward compatible with standard tar tools
like GNU tar, which treat the resulting multimember tar.lz archive like
any other tar.lz archive.
Tarlz is a small and simple implementation of the tar archiver. By default
tarlz creates, lists and extracts archives in a simplified posix pax format
compressed with lzip on a per file basis. Each tar member is compressed in
its own lzip member, as well as the end-of-file blocks. This method is fully
backward compatible with standard tar tools like GNU tar, which treat the
resulting multimember tar.lz archive like any other tar.lz archive. Tarlz
can append files to the end of such compressed archives.
Tarlz can create tar archives with four levels of compression
granularity; per file, per directory, appendable solid, and solid.
Tarlz is intended as a showcase project for the maintainers of real tar
programs to evaluate the format and perhaps implement it in their tools.
The diagram below shows the correspondence between tar members (formed
by a header plus optional data) in the tar archive and lzip members in
the resulting multimember tar.lz archive:
tar
+========+======+========+======+========+======+========+
| header | data | header | data | header | data | eof |
+========+======+========+======+========+======+========+
tar.lz
+===============+===============+===============+========+
| member | member | member | member |
+===============+===============+===============+========+
Of course, compressing each file (or each directory) individually is
less efficient than compressing the whole tar archive, but it has the
following advantages:
@ -38,19 +18,56 @@ following advantages:
* The resulting multimember tar.lz archive can be decompressed in
parallel with plzip, multiplying the decompression speed.
* New members can be appended to the archive (by removing the eof
* New members can be appended to the archive (by removing the EOF
member) just like to an uncompressed tar archive.
* It is a safe posix-style backup format. In case of corruption,
tarlz can extract all the undamaged members from the tar.lz
archive, skipping over the damaged members, just like the standard
(uncompressed) tar. Moreover, lziprecover can be used to recover at
least part of the contents of the damaged members.
(uncompressed) tar. Moreover, the option '--keep-damaged' can be
used to recover as much data as possible from each damaged member,
and lziprecover can be used to recover some of the damaged members.
* A multimember tar.lz archive is usually smaller than the
corresponding solidly compressed tar.gz archive, except when
individually compressing files smaller than about 32 KiB.
Note that the posix pax format has a serious flaw. The metadata stored
in pax extended records are not protected by any kind of check sequence.
Corruption in a long filename may cause the extraction of the file in the
wrong place without warning. Corruption in a long file size may cause the
truncation of the file or the appending of garbage to the file, both
followed by a spurious warning about a corrupt header far from the place
of the undetected corruption.
Metadata like filename and file size must be always protected in an archive
format because of the adverse effects of undetected corruption in them,
potentially much worse that undetected corruption in the data. Even more so
in the case of pax because the amount of metadata it stores is potentially
large, making undetected corruption more probable.
Because of the above, tarlz protects the extended records with a CRC in
a way compatible with standard tar tools.
Tarlz does not understand other tar formats like gnu, oldgnu, star or v7.
Tarlz is intended as a showcase project for the maintainers of real tar
programs to evaluate the format and perhaps implement it in their tools.
The diagram below shows the correspondence between each tar member
(formed by one or two headers plus optional data) in the tar archive and
each lzip member in the resulting multimember tar.lz archive:
tar
+========+======+=================+===============+========+======+========+
| header | data | extended header | extended data | header | data | EOF |
+========+======+=================+===============+========+======+========+
tar.lz
+===============+=================================================+========+
| member | member | member |
+===============+=================================================+========+
Copyright (C) 2013-2018 Antonio Diaz Diaz.

12
configure vendored
View file

@ -6,7 +6,7 @@
# to copy, distribute and modify it.
pkgname=tarlz
pkgversion=0.4
pkgversion=0.8
progname=tarlz
srctrigger=doc/${pkgname}.texi
@ -70,6 +70,7 @@ while [ $# != 0 ] ; do
echo " CXX=COMPILER C++ compiler to use [${CXX}]"
echo " CPPFLAGS=OPTIONS command line options for the preprocessor [${CPPFLAGS}]"
echo " CXXFLAGS=OPTIONS command line options for the C++ compiler [${CXXFLAGS}]"
echo " CXXFLAGS+=OPTIONS append options to the current value of CXXFLAGS"
echo " LDFLAGS=OPTIONS command line options for the linker [${LDFLAGS}]"
echo
exit 0 ;;
@ -93,10 +94,11 @@ while [ $# != 0 ] ; do
--mandir=*) mandir=${optarg} ;;
--no-create) no_create=yes ;;
CXX=*) CXX=${optarg} ;;
CPPFLAGS=*) CPPFLAGS=${optarg} ;;
CXXFLAGS=*) CXXFLAGS=${optarg} ;;
LDFLAGS=*) LDFLAGS=${optarg} ;;
CXX=*) CXX=${optarg} ;;
CPPFLAGS=*) CPPFLAGS=${optarg} ;;
CXXFLAGS=*) CXXFLAGS=${optarg} ;;
CXXFLAGS+=*) CXXFLAGS="${CXXFLAGS} ${optarg}" ;;
LDFLAGS=*) LDFLAGS=${optarg} ;;
--*)
echo "configure: WARNING: unrecognized option: '${option}'" 1>&2 ;;

306
create.cc
View file

@ -28,6 +28,10 @@
#include <stdint.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#if defined(__GNU_LIBRARY__)
#include <sys/sysmacros.h> // for major, minor
#endif
#include <ftw.h>
#include <grp.h>
#include <pwd.h>
@ -37,6 +41,9 @@
#include "lzip.h"
#include "tarlz.h"
const CRC32C crc32c;
int cl_owner = -1; // global vars needed by add_member
int cl_group = -1;
int cl_solid = 0; // 1 = dsolid, 2 = asolid, 3 = solid
@ -44,6 +51,7 @@ int cl_solid = 0; // 1 = dsolid, 2 = asolid, 3 = solid
namespace {
LZ_Encoder * encoder = 0; // local vars needed by add_member
const char * archive_namep = 0;
int outfd = -1;
int gretval = 0;
@ -55,31 +63,67 @@ int seek_read( const int fd, uint8_t * const buf, const int size,
return 0;
}
// Check archive type, remove EOF blocks, and leave outfd file pos at EOF
bool check_appendable()
// infd and outfd can refer to the same file if copying to a lower file
// position or if source and destination blocks don't overlap.
// max_size < 0 means no size limit.
bool copy_file( const int infd, const int outfd, const long long max_size = -1 )
{
const int buffer_size = 65536;
// remaining number of bytes to copy
long long rest = ( ( max_size >= 0 ) ? max_size : buffer_size );
long long copied_size = 0;
uint8_t * const buffer = new uint8_t[buffer_size];
bool error = false;
while( rest > 0 )
{
const int size = std::min( (long long)buffer_size, rest );
if( max_size >= 0 ) rest -= size;
const int rd = readblock( infd, buffer, size );
if( rd != size && errno )
{ show_error( "Error reading input file", errno ); error = true; break; }
if( rd > 0 )
{
const int wr = writeblock( outfd, buffer, rd );
if( wr != rd )
{ show_error( "Error writing output file", errno );
error = true; break; }
copied_size += rd;
}
if( rd < size ) break; // EOF
}
delete[] buffer;
return ( !error && ( max_size < 0 || copied_size == max_size ) );
}
/* Check archive type. If success, leave fd file pos at 0.
If remove_eof, leave fd file pos at beginning of the EOF blocks. */
bool check_appendable( const int fd, const bool remove_eof )
{
struct stat st;
if( fstat( outfd, &st ) != 0 || !S_ISREG( st.st_mode ) ) return false;
uint8_t buf[header_size];
int rd = readblock( outfd, buf, header_size );
if( fstat( fd, &st ) != 0 || !S_ISREG( st.st_mode ) ) return false;
if( lseek( fd, 0, SEEK_SET ) != 0 ) return false;
enum { bufsize = header_size + ( header_size / 8 ) };
uint8_t buf[bufsize];
int rd = readblock( fd, buf, bufsize );
if( rd == 0 && errno == 0 ) return true; // append to empty archive
if( rd < min_member_size || ( rd != header_size && errno ) ) return false;
const Lzip_header * const p = (Lzip_header *)buf; // shut up gcc
if( rd < min_member_size || ( rd != bufsize && errno ) ) return false;
const Lzip_header * const p = (const Lzip_header *)buf; // shut up gcc
if( !p->verify_magic() ) return false;
LZ_Decoder * decoder = LZ_decompress_open(); // decompress first header
if( !decoder || LZ_decompress_errno( decoder ) != LZ_ok ||
LZ_decompress_write( decoder, buf, rd ) != rd ||
( rd = LZ_decompress_read( decoder, buf, header_size ) ) <
magic_o + magic_l )
( rd = LZ_decompress_read( decoder, buf, header_size ) ) != header_size )
{ LZ_decompress_close( decoder ); return false; }
LZ_decompress_close( decoder );
const bool maybe_eof = ( buf[0] == 0 );
if( !verify_ustar_chksum( buf ) && !maybe_eof ) return false;
const long long end = lseek( outfd, 0, SEEK_END );
const long long end = lseek( fd, 0, SEEK_END );
if( end < min_member_size ) return false;
Lzip_trailer trailer;
if( seek_read( outfd, trailer.data, Lzip_trailer::size,
if( seek_read( fd, trailer.data, Lzip_trailer::size,
end - Lzip_trailer::size ) != Lzip_trailer::size )
return false;
const long long member_size = trailer.member_size();
@ -87,9 +131,8 @@ bool check_appendable()
( maybe_eof && member_size != end ) ) return false;
Lzip_header header;
if( seek_read( outfd, header.data, Lzip_header::size,
end - member_size ) != Lzip_header::size )
return false;
if( seek_read( fd, header.data, Lzip_header::size,
end - member_size ) != Lzip_header::size ) return false;
if( !header.verify_magic() || !isvalid_ds( header.dictionary_size() ) )
return false;
@ -102,12 +145,33 @@ bool check_appendable()
crc ^= 0xFFFFFFFFU;
if( crc != data_crc ) return false;
if( lseek( outfd, end - member_size, SEEK_SET ) != end - member_size ||
ftruncate( outfd, end - member_size ) != 0 ) return false;
return true;
const long long pos = remove_eof ? end - member_size : 0;
return ( lseek( fd, pos, SEEK_SET ) == pos );
}
class File_is_archive
{
dev_t archive_dev;
ino_t archive_ino;
bool initialized;
public:
File_is_archive() : initialized( false ) {}
bool init()
{
struct stat st;
if( fstat( outfd, &st ) != 0 ) return false;
if( S_ISREG( st.st_mode ) )
{ archive_dev = st.st_dev; archive_ino = st.st_ino; initialized = true; }
return true;
}
bool operator()( const struct stat & st ) const
{
return initialized && archive_dev == st.st_dev && archive_ino == st.st_ino;
}
} file_is_archive;
bool archive_write( const uint8_t * const buf, const int size )
{
if( !encoder ) // uncompressed
@ -121,9 +185,10 @@ bool archive_write( const uint8_t * const buf, const int size )
const int wr = LZ_compress_write( encoder, buf + sz, size - sz );
if( wr < 0 ) internal_error( "library error (LZ_compress_write)." );
sz += wr;
if( sz >= size && size > 0 ) break; // minimize dictionary size
const int rd = LZ_compress_read( encoder, obuf, obuf_size );
if( rd < 0 ) internal_error( "library error (LZ_compress_read)." );
if( rd == 0 && sz == size ) break;
if( rd == 0 && sz >= size ) break;
if( writeblock( outfd, obuf, rd ) != rd ) return false;
}
if( LZ_compress_finished( encoder ) == 1 &&
@ -133,11 +198,98 @@ bool archive_write( const uint8_t * const buf, const int size )
}
void init_tar_header( Tar_header header ) // set magic and version
{
std::memset( header, 0, header_size );
std::memcpy( header + magic_o, ustar_magic, magic_l - 1 );
header[version_o] = header[version_o+1] = '0';
}
unsigned char xdigit( const unsigned value )
{
if( value <= 9 ) return '0' + value;
if( value <= 15 ) return 'A' + value - 10;
return 0;
}
void print_hex( char * const buf, int size, unsigned long long num )
{
while( --size >= 0 ) { buf[size] = xdigit( num & 0x0F ); num >>= 4; }
}
void print_octal( char * const buf, int size, unsigned long long num )
{
while( --size >= 0 ) { buf[size] = '0' + ( num % 8 ); num /= 8; }
}
unsigned decimal_digits( unsigned long long value )
{
unsigned digits = 1;
while( value >= 10 ) { value /= 10; ++digits; }
return digits;
}
unsigned long long record_size( const unsigned keyword_size,
const unsigned long long value_size )
{
// size = ' ' + keyword + '=' + value + '\n'
const unsigned long long size = 1 + keyword_size + 1 + value_size + 1;
const unsigned d1 = decimal_digits( size );
return decimal_digits( d1 + size ) + size;
}
bool write_extended( const Extended & extended )
{
const int path_rec = extended.path.size() ?
record_size( 4, extended.path.size() ) : 0;
const int lpath_rec = extended.linkpath.size() ?
record_size( 8, extended.linkpath.size() ) : 0;
const int size_rec = ( extended.size > 0 ) ?
record_size( 4, decimal_digits( extended.size ) ) : 0;
const unsigned long long edsize = path_rec + lpath_rec + size_rec + 22;
const unsigned long long bufsize = round_up( edsize );
if( edsize >= 1ULL << 33 ) return false; // too much extended data
if( bufsize == 0 ) return edsize == 0; // overflow or no extended data
char * const buf = new char[bufsize+1]; // extended records buffer
unsigned long long pos = path_rec; // goto can't cross this
if( path_rec && snprintf( buf, path_rec + 1, "%d path=%s\n",
path_rec, extended.path.c_str() ) != path_rec )
goto error;
if( lpath_rec && snprintf( buf + pos, lpath_rec + 1, "%d linkpath=%s\n",
lpath_rec, extended.linkpath.c_str() ) != lpath_rec )
goto error;
pos += lpath_rec;
if( size_rec && snprintf( buf + pos, size_rec + 1, "%d size=%llu\n",
size_rec, extended.size ) != size_rec )
goto error;
pos += size_rec;
if( snprintf( buf + pos, 23, "22 GNU.crc32=00000000\n" ) != 22 ) goto error;
pos += 22;
if( pos != edsize ) goto error;
print_hex( buf + edsize - 9, 8,
crc32c.windowed_crc( (const uint8_t *)buf, edsize - 9, edsize ) );
std::memset( buf + edsize, 0, bufsize - edsize ); // wipe padding
Tar_header header; // extended header
init_tar_header( header );
header[typeflag_o] = tf_extended; // fill only required fields
print_octal( header + size_o, size_l - 1, edsize );
print_octal( header + chksum_o, chksum_l - 1,
ustar_chksum( (const uint8_t *)header ) );
if( !archive_write( (const uint8_t *)header, header_size ) ) goto error;
for( pos = 0; pos < bufsize; ) // write extended records to archive
{
int size = std::min( bufsize - pos, 1ULL << 20 );
if( !archive_write( (const uint8_t *)buf + pos, size ) ) goto error;
pos += size;
}
delete[] buf;
return true;
error:
delete[] buf;
return false;
}
const char * remove_leading_dotdot( const char * const filename )
{
@ -164,24 +316,31 @@ const char * remove_leading_dotdot( const char * const filename )
}
bool split_name( const char * const filename, Tar_header header )
// Return true if filename fits in the ustar header.
bool store_name( const char * const filename, Extended & extended,
Tar_header header )
{
const char * const stored_name = remove_leading_dotdot( filename );
const int len = std::strlen( stored_name );
enum { max_len = prefix_l + 1 + name_l }; // prefix + '/' + name
// first try storing filename in the ustar header
if( len <= name_l ) // stored_name fits in name
{ std::memcpy( header + name_o, stored_name, len ); return true; }
if( len <= max_len ) // find shortest prefix
for( int i = len - name_l - 1; i < len && i <= prefix_l; ++i )
if( stored_name[i] == '/' )
if( stored_name[i] == '/' ) // stored_name can be split
{
std::memcpy( header + name_o, stored_name + i + 1, len - i - 1 );
std::memcpy( header + prefix_o, stored_name, i );
return true;
}
// store filename in extended record, leave name zeroed in ustar header
extended.path = stored_name;
return false;
}
int add_member( const char * const filename, const struct stat *,
const int flag, struct FTW * )
{
@ -189,11 +348,13 @@ int add_member( const char * const filename, const struct stat *,
if( lstat( filename, &st ) != 0 )
{ show_file_error( filename, "Can't stat input file", errno );
gretval = 1; return 0; }
if( file_is_archive( st ) )
{ show_file_error( archive_namep, "File is the archive; not dumped." );
return 0; }
Extended extended; // metadata for extended records
Tar_header header;
std::memset( header, 0, header_size );
if( !split_name( filename, header ) )
{ show_file_error( filename, "File name is too long." );
gretval = 2; return 0; }
init_tar_header( header );
store_name( filename, extended, header );
const mode_t mode = st.st_mode;
print_octal( header + mode_o, mode_l - 1,
@ -201,10 +362,17 @@ int add_member( const char * const filename, const struct stat *,
S_IRWXU | S_IRWXG | S_IRWXO ) );
const uid_t uid = ( cl_owner >= 0 ) ? (uid_t)cl_owner : st.st_uid;
const gid_t gid = ( cl_group >= 0 ) ? (gid_t)cl_group : st.st_gid;
if( uid >= 2 << 20 || gid >= 2 << 20 )
{ show_file_error( filename, "uid or gid is larger than 2_097_151." );
gretval = 1; return 0; }
print_octal( header + uid_o, uid_l - 1, uid );
print_octal( header + gid_o, gid_l - 1, gid );
const long long mtime = st.st_mtime; // shut up gcc
if( mtime < 0 || mtime >= 1LL << 33 )
{ show_file_error( filename, "mtime is out of ustar range [0, 8_589_934_591]." );
gretval = 1; return 0; }
print_octal( header + mtime_o, mtime_l - 1, mtime );
unsigned long long file_size = 0;
print_octal( header + mtime_o, mtime_l - 1, st.st_mtime );
Typeflag typeflag;
if( S_ISREG( mode ) ) { typeflag = tf_regular; file_size = st.st_size; }
else if( S_ISDIR( mode ) )
@ -217,16 +385,26 @@ int add_member( const char * const filename, const struct stat *,
else if( S_ISLNK( mode ) )
{
typeflag = tf_symlink;
if( st.st_size > linkname_l ||
readlink( filename, header + linkname_o, linkname_l ) != st.st_size )
long len;
if( st.st_size <= linkname_l )
len = readlink( filename, header + linkname_o, linkname_l );
else
{
show_file_error( filename, "Link destination name is too long." );
gretval = 2; return 0;
char * const buf = new char[st.st_size+1];
len = readlink( filename, buf, st.st_size );
if( len == st.st_size ) { buf[len] = 0; extended.linkpath = buf; }
delete[] buf;
}
if( len != st.st_size )
{ show_file_error( filename, "Error reading link", (len < 0) ? errno : 0 );
gretval = 1; return 0; }
}
else if( S_ISCHR( mode ) || S_ISBLK( mode ) )
{
typeflag = S_ISCHR( mode ) ? tf_chardev : tf_blockdev;
if( major( st.st_dev ) >= 2 << 20 || minor( st.st_dev ) >= 2 << 20 )
{ show_file_error( filename, "devmajor or devminor is larger than 2_097_151." );
gretval = 1; return 0; }
print_octal( header + devmajor_o, devmajor_l - 1, major( st.st_dev ) );
print_octal( header + devminor_o, devminor_l - 1, minor( st.st_dev ) );
}
@ -234,22 +412,23 @@ int add_member( const char * const filename, const struct stat *,
else { show_file_error( filename, "Unknown file type." );
gretval = 2; return 0; }
header[typeflag_o] = typeflag;
std::memcpy( header + magic_o, ustar_magic, magic_l - 1 );
header[version_o] = header[version_o+1] = '0';
const struct passwd * const pw = getpwuid( uid );
if( pw && pw->pw_name )
std::strncpy( header + uname_o, pw->pw_name, uname_l - 1 );
const struct group * const gr = getgrgid( gid );
if( gr && gr->gr_name )
std::strncpy( header + gname_o, gr->gr_name, gname_l - 1 );
print_octal( header + size_o, size_l - 1, file_size );
if( file_size >= 1ULL << 33 ) extended.size = file_size;
else print_octal( header + size_o, size_l - 1, file_size );
print_octal( header + chksum_o, chksum_l - 1,
ustar_chksum( (const uint8_t *)header ) );
const int infd = file_size ? open_instream( filename ) : -1;
if( file_size && infd < 0 ) { gretval = 1; return 0; }
if( !extended.empty() && !write_extended( extended ) )
{ show_error( "Error writing extended header", errno ); return 1; }
if( !archive_write( (const uint8_t *)header, header_size ) )
{ show_error( "Error writing archive header", errno ); return 1; }
{ show_error( "Error writing ustar header", errno ); return 1; }
if( file_size )
{
enum { bufsize = 32 * header_size };
@ -304,6 +483,49 @@ bool verify_ustar_chksum( const uint8_t * const buf )
ustar_chksum( buf ) == strtoul( (const char *)buf + chksum_o, 0, 8 ) ); }
int concatenate( const std::string & archive_name, const Arg_parser & parser,
const int filenames )
{
if( !filenames )
{ if( verbosity >= 1 ) show_error( "Nothing to concatenate." ); return 0; }
if( archive_name.empty() )
{ show_error( "'--concatenate' is incompatible with '-f -'.", 0, true );
return 1; }
if( ( outfd = open_outstream( archive_name, false ) ) < 0 ) return 1;
if( !file_is_archive.init() )
{ show_file_error( archive_name.c_str(), "Can't stat", errno ); return 1; }
int retval = 0;
for( int i = 0; i < parser.arguments(); ++i ) // copy archives
{
if( parser.code( i ) ) continue; // skip options
const char * const filename = parser.argument( i ).c_str();
const int infd = open_instream( filename );
if( infd < 0 )
{ show_file_error( filename, "Can't open input file", errno );
retval = 1; break; }
if( !check_appendable( infd, false ) )
{ show_file_error( filename, "Not an appendable tar.lz archive." );
close( infd ); retval = 2; break; }
struct stat st;
if( fstat( infd, &st ) == 0 && file_is_archive( st ) )
{ show_file_error( filename, "File is the archive; not concatenated." );
close( infd ); continue; }
if( !check_appendable( outfd, true ) )
{ show_error( "This does not look like an appendable tar.lz archive." );
close( infd ); retval = 2; break; }
if( !copy_file( infd, outfd ) || close( infd ) != 0 )
{ show_file_error( filename, "Error copying archive", errno );
retval = 1; break; }
if( verbosity >= 1 ) std::fprintf( stderr, "%s\n", filename );
}
if( close( outfd ) != 0 && !retval )
{ show_error( "Error closing archive", errno ); retval = 1; }
return retval;
}
int encode( const std::string & archive_name, const Arg_parser & parser,
const int filenames, const int level, const bool append )
{
@ -345,11 +567,15 @@ int encode( const std::string & archive_name, const Arg_parser & parser,
{ show_error( "'--append' is incompatible with '--uncompressed'.", 0, true );
return 1; }
if( ( outfd = open_outstream( archive_name, false ) ) < 0 ) return 1;
if( !check_appendable() )
if( !check_appendable( outfd, true ) )
{ show_error( "This does not look like an appendable tar.lz archive." );
return 2; }
}
archive_namep = archive_name.size() ? archive_name.c_str() : "(stdout)";
if( !file_is_archive.init() )
{ show_file_error( archive_namep, "Can't stat", errno ); return 1; }
if( compressed )
{
encoder = LZ_compress_open( option_mapping[level].dictionary_size,
@ -365,7 +591,6 @@ int encode( const std::string & archive_name, const Arg_parser & parser,
}
int retval = 0;
std::string deslashed; // arg without trailing slashes
for( int i = 0; i < parser.arguments(); ++i ) // write members
{
const int code = parser.code( i );
@ -375,6 +600,7 @@ int encode( const std::string & archive_name, const Arg_parser & parser,
{ show_file_error( filename, "Error changing working directory", errno );
retval = 1; break; }
if( code ) continue; // skip options
std::string deslashed; // arg without trailing slashes
unsigned len = arg.size();
while( len > 1 && arg[len-1] == '/' ) --len;
if( len < arg.size() )
@ -391,16 +617,18 @@ int encode( const std::string & archive_name, const Arg_parser & parser,
if( !retval ) // write End-Of-Archive records
{
uint8_t buf[header_size];
std::memset( buf, 0, header_size );
enum { bufsize = 2 * header_size };
uint8_t buf[bufsize];
std::memset( buf, 0, bufsize );
if( encoder && cl_solid == 2 && !archive_write( 0, 0 ) ) // flush encoder
{ show_error( "Error flushing encoder", errno ); retval = 1; }
else if( !archive_write( buf, header_size ) ||
!archive_write( buf, header_size ) ||
else if( !archive_write( buf, bufsize ) ||
( encoder && !archive_write( 0, 0 ) ) ) // flush encoder
{ show_error( "Error writing end-of-archive blocks", errno );
retval = 1; }
}
if( encoder && LZ_compress_close( encoder ) < 0 )
{ show_error( "LZ_compress_close failed." ); retval = 1; }
if( close( outfd ) != 0 && !retval )
{ show_error( "Error closing archive", errno ); retval = 1; }
if( retval && archive_name.size() && !append )

41
doc/tarlz.1
View file

@ -1,12 +1,25 @@
.\" DO NOT MODIFY THIS FILE! It was generated by help2man 1.46.1.
.TH TARLZ "1" "April 2018" "tarlz 0.4" "User Commands"
.TH TARLZ "1" "December 2018" "tarlz 0.8" "User Commands"
.SH NAME
tarlz \- creates tar archives with multimember lzip compression
.SH SYNOPSIS
.B tarlz
[\fI\,options\/\fR] [\fI\,files\/\fR]
.SH DESCRIPTION
Tarlz \- Archiver with multimember lzip compression.
Tarlz is a small and simple implementation of the tar archiver. By default
tarlz creates, lists and extracts archives in a simplified posix pax format
compressed with lzip on a per file basis. Each tar member is compressed in
its own lzip member, as well as the end\-of\-file blocks. This method is fully
backward compatible with standard tar tools like GNU tar, which treat the
resulting multimember tar.lz archive like any other tar.lz archive. Tarlz
can append files to the end of such compressed archives.
.PP
The tarlz file format is a safe posix\-style backup format. In case of
corruption, tarlz can extract all the undamaged members from the tar.lz
archive, skipping over the damaged members, just like the standard
(uncompressed) tar. Moreover, the option '\-\-keep\-damaged' can be used to
recover as much data as possible from each damaged member, and lziprecover
can be used to recover some of the damaged members.
.SH OPTIONS
.TP
\fB\-h\fR, \fB\-\-help\fR
@ -15,6 +28,9 @@ display this help and exit
\fB\-V\fR, \fB\-\-version\fR
output version information and exit
.TP
\fB\-A\fR, \fB\-\-concatenate\fR
append tar.lz archives to the end of an archive
.TP
\fB\-c\fR, \fB\-\-create\fR
create a new archive
.TP
@ -48,17 +64,29 @@ create solidly compressed appendable archive
\fB\-\-dsolid\fR
create per\-directory compressed archive
.TP
\fB\-\-no\-solid\fR
create per\-file compressed archive (default)
.TP
\fB\-\-solid\fR
create solidly compressed archive
.TP
\fB\-\-group=\fR<group>
use <group> name/id for added files
\fB\-\-anonymous\fR
equivalent to '\-\-owner=root \fB\-\-group\fR=\fI\,root\/\fR'
.TP
\fB\-\-owner=\fR<owner>
use <owner> name/id for added files
use <owner> name/ID for files added
.TP
\fB\-\-group=\fR<group>
use <group> name/ID for files added
.TP
\fB\-\-keep\-damaged\fR
don't delete partially extracted files
.TP
\fB\-\-missing\-crc\fR
exit with error status if missing extended CRC
.TP
\fB\-\-uncompressed\fR
don't compress the created archive
don't compress the archive created
.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
@ -70,6 +98,7 @@ Report bugs to lzip\-bug@nongnu.org
Tarlz home page: http://www.nongnu.org/lzip/tarlz.html
.SH COPYRIGHT
Copyright \(co 2018 Antonio Diaz Diaz.
Using lzlib 1.11\-rc2
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.

498
doc/tarlz.info
View file

@ -11,15 +11,17 @@ File: tarlz.info, Node: Top, Next: Introduction, Up: (dir)
Tarlz Manual
************
This manual is for Tarlz (version 0.4, 23 April 2018).
This manual is for Tarlz (version 0.8, 16 December 2018).
* Menu:
* Introduction:: Purpose and features of tarlz
* Invoking tarlz:: Command line interface
* Examples:: A small tutorial with examples
* Problems:: Reporting bugs
* Concept index:: Index of concepts
* Introduction:: Purpose and features of tarlz
* Invoking tarlz:: Command line interface
* File format:: Detailed format of the compressed archive
* Amendments to pax format:: The reasons for the differences with pax
* Examples:: A small tutorial with examples
* Problems:: Reporting bugs
* Concept index:: Index of concepts
Copyright (C) 2013-2018 Antonio Diaz Diaz.
@ -34,38 +36,17 @@ File: tarlz.info, Node: Introduction, Next: Invoking tarlz, Prev: Top, Up: T
**************
Tarlz is a small and simple implementation of the tar archiver. By
default tarlz creates, lists and extracts archives in the 'ustar' format
compressed with lzip on a per file basis. Tarlz can append files to the
end of such compressed archives.
Each tar member is compressed in its own lzip member, as well as the
end-of-file blocks. This same method works for any tar format (gnu,
ustar, posix) and is fully backward compatible with standard tar tools
default tarlz creates, lists and extracts archives in a simplified
posix pax format compressed with lzip on a per file basis. Each tar
member is compressed in its own lzip member, as well as the end-of-file
blocks. This method is fully backward compatible with standard tar tools
like GNU tar, which treat the resulting multimember tar.lz archive like
any other tar.lz archive.
any other tar.lz archive. Tarlz can append files to the end of such
compressed archives.
Tarlz can create tar archives with four levels of compression
granularity; per file, per directory, appendable solid, and solid.
Tarlz is intended as a showcase project for the maintainers of real
tar programs to evaluate the format and perhaps implement it in their
tools.
The diagram below shows the correspondence between tar members
(formed by a header plus optional data) in the tar archive and lzip
members in the resulting multimember tar.lz archive: *Note File format:
(lzip)File format.
tar
+========+======+========+======+========+======+========+
| header | data | header | data | header | data | eof |
+========+======+========+======+========+======+========+
tar.lz
+===============+===============+===============+========+
| member | member | member | member |
+===============+===============+===============+========+
Of course, compressing each file (or each directory) individually is
less efficient than compressing the whole tar archive, but it has the
following advantages:
@ -73,21 +54,32 @@ following advantages:
* The resulting multimember tar.lz archive can be decompressed in
parallel with plzip, multiplying the decompression speed.
* New members can be appended to the archive (by removing the eof
* New members can be appended to the archive (by removing the EOF
member) just like to an uncompressed tar archive.
* It is a safe posix-style backup format. In case of corruption,
tarlz can extract all the undamaged members from the tar.lz
archive, skipping over the damaged members, just like the standard
(uncompressed) tar. Moreover, lziprecover can be used to recover at
least part of the contents of the damaged members.
(uncompressed) tar. Moreover, the option '--keep-damaged' can be
used to recover as much data as possible from each damaged member,
and lziprecover can be used to recover some of the damaged members.
* A multimember tar.lz archive is usually smaller than the
corresponding solidly compressed tar.gz archive, except when
individually compressing files smaller than about 32 KiB.
Tarlz protects the extended records with a CRC in a way compatible
with standard tar tools. *Note crc32::.
Tarlz does not understand other tar formats like 'gnu', 'oldgnu',
'star' or 'v7'.
Tarlz is intended as a showcase project for the maintainers of real
tar programs to evaluate the format and perhaps implement it in their
tools.

File: tarlz.info, Node: Invoking tarlz, Next: Examples, Prev: Introduction, Up: Top
File: tarlz.info, Node: Invoking tarlz, Next: File format, Prev: Introduction, Up: Top
2 Invoking tarlz
****************
@ -97,9 +89,15 @@ The format for running tarlz is:
tarlz [OPTIONS] [FILES]
On archive creation or appending, tarlz removes leading and trailing
slashes from file names, as well as file name prefixes containing a
'..' component. On extraction, archive members containing a '..'
component are skipped.
slashes from filenames, as well as filename prefixes containing a '..'
component. On extraction, archive members containing a '..' component
are skipped. Tarlz detects when the archive being created or enlarged
is among the files to be dumped, appended or concatenated, and skips it.
On extraction and listing, tarlz removes leading './' strings from
member names in the archive or given in the command line, so that
'tarlz -xf foo ./bar baz' extracts members 'bar' and './baz' from
archive 'foo'.
tarlz supports the following options:
@ -110,10 +108,22 @@ component are skipped.
'-V'
'--version'
Print the version number of tarlz on the standard output and exit.
This version number should be included in all bug reports.
'-A'
'--concatenate'
Append tar.lz archives to the end of a tar.lz archive. All the
archives involved must be regular (seekable) files compressed as
multimember lzip files, and the two end-of-file blocks plus any
zero padding must be contained in the last lzip member of each
archive. The intermediate end-of-file blocks are removed as each
new archive is concatenated. Exit with status 0 without modifying
the archive if no FILES have been specified. Tarlz can't
concatenate uncompressed tar archives.
'-c'
'--create'
Create a new archive.
Create a new archive from FILES.
'-C DIR'
'--directory=DIR'
@ -137,18 +147,19 @@ component are skipped.
'-r'
'--append'
Append files to the end of an archive. The archive must be a
Append files to the end of a tar.lz archive. The archive must be a
regular (seekable) file compressed as a multimember lzip file, and
the two end-of-file blocks plus any zero padding must be contained
in the last lzip member of the archive. First this last member is
removed, then the new members are appended, and then a new
end-of-file member is appended to the archive. Exit with status 0
without modifying the archive if no FILES have been specified.
tarlz can't append files to an uncompressed tar archive.
Tarlz can't append files to an uncompressed tar archive.
'-t'
'--list'
List the contents of an archive.
List the contents of an archive. If FILES are given, list only the
given FILES.
'-v'
'--verbose'
@ -156,10 +167,14 @@ component are skipped.
'-x'
'--extract'
Extract files from an archive.
Extract files from an archive. If FILES are given, extract only
the given FILES. Else extract all the files in the archive.
'-0 .. -9'
Set the compression level. The default compression level is '-6'.
Like lzip, tarlz also minimizes the dictionary size of the lzip
members it creates, reducing the amount of memory required for
decompression.
'--asolid'
When creating or appending to a compressed archive, use appendable
@ -175,22 +190,49 @@ component are skipped.
creates a compressed appendable archive with a separate lzip
member for each top-level directory.
'--no-solid'
When creating or appending to a compressed archive, compress each
file separately. The end-of-file blocks are compressed into a
separate lzip member. This creates a compressed appendable archive
with a separate lzip member for each file. This option allows
tarlz revert to default behavior if, for example, tarlz is invoked
through an alias like 'tar='tarlz --solid''.
'--solid'
When creating or appending to a compressed archive, use solid
compression. The files being added to the archive, along with the
end-of-file blocks, are compressed into a single lzip member. The
resulting archive is not appendable. No more files can be later
appended to the archive without decompressing it first.
appended to the archive.
'--anonymous'
Equivalent to '--owner=root --group=root'.
'--owner=OWNER'
When creating or appending, use OWNER for files added to the
archive. If OWNER is not a valid user name, it is decoded as a
decimal numeric user ID.
'--group=GROUP'
When creating or appending, use GROUP for files added to the
archive. If GROUP is not a valid group name, it is decoded as a
decimal numeric group ID.
'--owner=OWNER'
When creating or appending, use OWNER for files added to the
archive. If OWNER is not a valid user name, it is decoded as a
decimal numeric user ID.
'--keep-damaged'
Don't delete partially extracted files. If a decompression error
happens while extracting a file, keep the partial data extracted.
Use this option to recover as much data as possible from each
damaged member.
'--missing-crc'
Exit with error status 2 if the CRC of the extended records is
missing. When this option is used, tarlz detects any corruption
in the extended records (only limited by CRC collisions). But note
that a corrupt 'GNU.crc32' keyword, for example 'GNU.crc33', is
reported as a missing CRC instead of as a corrupt record. This
misleading 'Missing CRC' message is the consequence of a flaw in
the posix pax format; i.e., the lack of a mandatory check sequence
in the extended records. *Note crc32::.
'--uncompressed'
With '--create', don't compress the created tar archive. Create an
@ -203,9 +245,337 @@ invalid input file, 3 for an internal consistency error (eg, bug) which
caused tarlz to panic.

File: tarlz.info, Node: Examples, Next: Problems, Prev: Invoking tarlz, Up: Top
File: tarlz.info, Node: File format, Next: Amendments to pax format, Prev: Invoking tarlz, Up: Top
3 A small tutorial with examples
3 File format
*************
In the diagram below, a box like this:
+---+
| | <-- the vertical bars might be missing
+---+
represents one byte; a box like this:
+==============+
| |
+==============+
represents a variable number of bytes or a fixed but large number of
bytes (for example 512).
A tar.lz file consists of a series of lzip members (compressed data
sets). The members simply appear one after another in the file, with no
additional information before, between, or after them.
Each lzip member contains one or more tar members in a simplified
posix pax interchange format; the only pax typeflag value supported by
tarlz (in addition to the typeflag values defined by the ustar format)
is 'x'. The pax format is an extension on top of the ustar format that
removes the size limitations of the ustar format.
Each tar member contains one file archived, and is represented by the
following sequence:
* An optional extended header block with extended header records.
This header block is of the form described in pax header block,
with a typeflag value of 'x'. The extended header records are
included as the data for this header block.
* A header block in ustar format that describes the file. Any fields
defined in the preceding optional extended header records override
the associated fields in this header block for this file.
* Zero or more blocks that contain the contents of the file.
At the end of the archive file there are two 512-byte blocks filled
with binary zeros, interpreted as an end-of-archive indicator. These EOF
blocks are either compressed in a separate lzip member or compressed
along with the tar members contained in the last lzip member.
The diagram below shows the correspondence between each tar member
(formed by one or two headers plus optional data) in the tar archive and
each lzip member in the resulting multimember tar.lz archive: *Note
File format: (lzip)File format.
tar
+========+======+=================+===============+========+======+========+
| header | data | extended header | extended data | header | data | EOF |
+========+======+=================+===============+========+======+========+
tar.lz
+===============+=================================================+========+
| member | member | member |
+===============+=================================================+========+
3.1 Pax header block
====================
The pax header block is identical to the ustar header block described
below except that the typeflag has the value 'x' (extended). The size
field is the size of the extended header data in bytes. Most other
fields in the pax header block are zeroed on archive creation to
prevent trouble if the archive is read by an ustar tool, and are
ignored by tarlz on archive extraction. *Note flawed-compat::.
The pax extended header data consists of one or more records, each of
them constructed as follows:
'"%d %s=%s\n", <length>, <keyword>, <value>'
The <length>, <blank>, <keyword>, <equals-sign>, and <newline> in the
record must be limited to the portable character set. The <length> field
contains the decimal length of the record in bytes, including the
trailing <newline>. The <value> field is stored as-is, without
conversion to UTF-8 nor any other transformation.
These are the <keyword> fields currently supported by tarlz:
'linkpath'
The pathname of a link being created to another file, of any type,
previously archived. This record overrides the linkname field in
the following ustar header block. The following ustar header block
determines the type of link created. If typeflag of the following
header block is 1, it will be a hard link. If typeflag is 2, it
will be a symbolic link and the linkpath value will be used as the
contents of the symbolic link.
'path'
The pathname of the following file. This record overrides the name
and prefix fields in the following ustar header block.
'size'
The size of the file in bytes, expressed as a decimal number using
digits from the ISO/IEC 646:1991 (ASCII) standard. This record
overrides the size field in the following ustar header block. The
size record is used only for files with a size value greater than
8_589_934_591 (octal 77777777777). This is 2^33 bytes or larger.
'GNU.crc32'
CRC32-C (Castagnoli) of the extended header data excluding the 8
bytes representing the CRC <value> itself. The <value> is
represented as 8 hexadecimal digits in big endian order,
'22 GNU.crc32=00000000\n'. The keyword of the CRC record is
protected by the CRC to guarante that corruption is always detected
(except in case of CRC collision). A CRC was chosen because a
checksum is too weak for a potentially large list of variable
sized records. A checksum can't detect simple errors like the
swapping of two bytes.
3.2 Ustar header block
======================
The ustar header block has a length of 512 bytes and is structured as
shown in the following table. All lengths and offsets are in decimal.
Field Name Offset Length (in bytes)
name 0 100
mode 100 8
uid 108 8
gid 116 8
size 124 12
mtime 136 12
chksum 148 8
typeflag 156 1
linkname 157 100
magic 257 6
version 263 2
uname 265 32
gname 297 32
devmajor 329 8
devminor 337 8
prefix 345 155
All characters in the header block are coded using the ISO/IEC
646:1991 (ASCII) standard, except in fields storing names for files,
users, and groups. For maximum portability between implementations,
names should only contain characters from the portable filename
character set. But if an implementation supports the use of characters
outside of '/' and the portable filename character set in names for
files, users, and groups, tarlz will use the byte values in these names
unmodified.
The fields name, linkname, and prefix are null-terminated character
strings except when all characters in the array contain non-null
characters including the last character.
The name and the prefix fields produce the pathname of the file. A
new pathname is formed, if prefix is not an empty string (its first
character is not null), by concatenating prefix (up to the first null
character), a <slash> character, and name; otherwise, name is used
alone. In either case, name is terminated at the first null character.
If prefix begins with a null character, it is ignored. In this manner,
pathnames of at most 256 characters can be supported. If a pathname does
not fit in the space provided, an extended record is used to store the
pathname.
The linkname field does not use the prefix to produce a pathname. If
the linkname does not fit in the 100 characters provided, an extended
record is used to store the linkname.
The mode field provides 12 access permission bits. The following
table shows the symbolic name of each bit and its octal value:
Bit Name Bit value
S_ISUID 04000
S_ISGID 02000
S_ISVTX 01000
S_IRUSR 00400
S_IWUSR 00200
S_IXUSR 00100
S_IRGRP 00040
S_IWGRP 00020
S_IXGRP 00010
S_IROTH 00004
S_IWOTH 00002
S_IXOTH 00001
The uid and gid fields are the user and group ID of the owner and
group of the file, respectively.
The size field contains the octal representation of the size of the
file in bytes. If the typeflag field specifies a file of type '0'
(regular file) or '7' (high performance regular file), the number of
logical records following the header is (size / 512) rounded to the next
integer. For all other values of typeflag, tarlz either sets the size
field to 0 or ignores it, and does not store or expect any logical
records following the header. If the file size is larger than
8_589_934_591 bytes (octal 77777777777), an extended record is used to
store the file size.
The mtime field contains the octal representation of the modification
time of the file at the time it was archived, obtained from the stat()
function.
The chksum field contains the octal representation of the value of
the simple sum of all bytes in the header logical record. Each byte in
the header is treated as an unsigned value. When calculating the
checksum, the chksum field is treated as if it were all <space>
characters.
The typeflag field contains a single character specifying the type of
file archived:
''0''
Regular file.
''1''
Hard link to another file, of any type, previously archived.
''2''
Symbolic link.
''3', '4''
Character special file and block special file respectively. In
this case the devmajor and devminor fields contain information
defining the device in unspecified format.
''5''
Directory.
''6''
FIFO special file.
''7''
Reserved to represent a file to which an implementation has
associated some high-performance attribute. Tarlz treats this type
of file as a regular file (type 0).
The magic field contains the ASCII null-terminated string "ustar".
The version field contains the characters "00" (0x30,0x30). The fields
uname, and gname are null-terminated character strings. Each numeric
field contains a leading zero-filled, null-terminated octal number using
digits from the ISO/IEC 646:1991 (ASCII) standard.

File: tarlz.info, Node: Amendments to pax format, Next: Examples, Prev: File format, Up: Top
4 The reasons for the differences with pax
******************************************
Tarlz is meant to reliably detect invalid or corrupt metadata during
extraction and to not create safety risks in the archives it creates. In
order to achieve these goals, tarlz makes some changes to the variant
of the pax format that it uses. This chapter describes these changes
and the concrete reasons to implement them.
4.1 Add a CRC of the extended records
=====================================
The posix pax format has a serious flaw. The metadata stored in pax
extended records are not protected by any kind of check sequence.
Corruption in a long filename may cause the extraction of the file in
the wrong place without warning. Corruption in a long file size may
cause the truncation of the file or the appending of garbage to the
file, both followed by a spurious warning about a corrupt header far
from the place of the undetected corruption.
Metadata like filename and file size must be always protected in an
archive format because of the adverse effects of undetected corruption
in them, potentially much worse that undetected corruption in the data.
Even more so in the case of pax because the amount of metadata it
stores is potentially large, making undetected corruption more probable.
Because of the above, tarlz protects the extended records with a CRC
in a way compatible with standard tar tools. *Note key_crc32::.
4.2 Remove flawed backward compatibility
========================================
In order to allow the extraction of pax archives by a tar utility
conforming to the POSIX-2:1993 standard, POSIX.1-2008 recommends
selecting extended header field values that allow such tar to create a
regular file containing the extended header records as data. This
approach is broken because if the extended header is needed because of
a long filename, the name and prefix fields will be unable to contain
the full pathname of the file. Therefore the files corresponding to
both the extended header and the overridden ustar header will be
extracted using truncated filenames, perhaps overwriting existing files
or directories. It may be a security risk to extract a file with a
truncated filename.
To avoid this problem, tarlz writes extended headers with all fields
zeroed except size, chksum, typeflag, magic and version. This prevents
old tar programs from extracting the extended records as a file in the
wrong place. Tarlz also sets to zero those fields of the ustar header
overridden by extended records.
If the extended header is needed because of a file size larger than
8 GiB, the size field will be unable to contain the full size of the
file. Therefore the file may be partially extracted, and the tool will
issue a spurious warning about a corrupt header at the point where it
thinks the file ends. Setting to zero the overridden size in the ustar
header at least prevents the partial extraction and makes obvious that
the file has been truncated.
4.3 As simple as possible (but not simpler)
===========================================
The tarlz format is mainly ustar. Extended pax headers are used only
when needed because the length of a filename or link name, or the size
of a file exceed the limits of the ustar format. Adding extended
headers to each member just to record subsecond timestamps seems
wasteful for a backup format.
4.4 Avoid misconversions to/from UTF-8
======================================
There is no portable way to tell what charset a text string is coded
into. Therefore, tarlz stores all fields representing text strings
as-is, without conversion to UTF-8 nor any other transformation. This
prevents accidental double UTF-8 conversions. If the need arises this
behavior will be adjusted with a command line option in the future.

File: tarlz.info, Node: Examples, Next: Problems, Prev: Amendments to pax format, Up: Top
5 A small tutorial with examples
********************************
Example 1: Create a multimember compressed archive 'archive.tar.lz'
@ -232,7 +602,7 @@ Example 4: Create a compressed appendable archive containing directories
'dir1', 'dir2' and 'dir3' with a separate lzip member per directory.
Then append files 'a', 'b', 'c', 'd' and 'e' to the archive, all of
them contained in a single lzip member. The resulting archive
'archive.tar.lz' contains 5 lzip members (including the eof member).
'archive.tar.lz' contains 5 lzip members (including the EOF member).
tarlz --dsolid -cf archive.tar.lz dir1 dir2 dir3
tarlz --asolid -rf archive.tar.lz a b c d e
@ -240,7 +610,7 @@ them contained in a single lzip member. The resulting archive
Example 5: Create a solidly compressed archive 'archive.tar.lz'
containing files 'a', 'b' and 'c'. Note that no more files can be later
appended to the archive without decompressing it first.
appended to the archive.
tarlz --solid -cf archive.tar.lz a b c
@ -263,7 +633,7 @@ Example 8: Copy the contents of directory 'sourcedir' to the directory

File: tarlz.info, Node: Problems, Next: Concept index, Prev: Examples, Up: Top
4 Reporting bugs
6 Reporting bugs
****************
There are probably bugs in tarlz. There are certainly errors and
@ -284,8 +654,11 @@ Concept index
[index]
* Menu:
* Amendments to pax format: Amendments to pax format.
(line 6)
* bugs: Problems. (line 6)
* examples: Examples. (line 6)
* file format: File format. (line 6)
* getting help: Problems. (line 6)
* introduction: Introduction. (line 6)
* invoking: Invoking tarlz. (line 6)
@ -297,11 +670,16 @@ Concept index

Tag Table:
Node: Top223
Node: Introduction785
Node: Invoking tarlz3280
Node: Examples7278
Node: Problems8975
Node: Concept index9501
Node: Introduction946
Node: Invoking tarlz3084
Node: File format9606
Ref: key_crc3214138
Node: Amendments to pax format19215
Ref: crc3219729
Ref: flawed-compat20753
Node: Examples23126
Node: Problems24802
Node: Concept index25328

End Tag Table

522
doc/tarlz.texi
View file

@ -6,8 +6,8 @@
@finalout
@c %**end of header
@set UPDATED 23 April 2018
@set VERSION 0.4
@set UPDATED 16 December 2018
@set VERSION 0.8
@dircategory Data Compression
@direntry
@ -35,11 +35,13 @@
This manual is for Tarlz (version @value{VERSION}, @value{UPDATED}).
@menu
* Introduction:: Purpose and features of tarlz
* Invoking tarlz:: Command line interface
* Examples:: A small tutorial with examples
* Problems:: Reporting bugs
* Concept index:: Index of concepts
* Introduction:: Purpose and features of tarlz
* Invoking tarlz:: Command line interface
* File format:: Detailed format of the compressed archive
* Amendments to pax format:: The reasons for the differences with pax
* Examples:: A small tutorial with examples
* Problems:: Reporting bugs
* Concept index:: Index of concepts
@end menu
@sp 1
@ -53,43 +55,19 @@ to copy, distribute and modify it.
@chapter Introduction
@cindex introduction
Tarlz is a small and simple implementation of the tar archiver. By
default tarlz creates, lists and extracts archives in the 'ustar' format
compressed with lzip on a per file basis. Tarlz can append files to the
end of such compressed archives.
Each tar member is compressed in its own lzip member, as well as the
end-of-file blocks. This same method works for any tar format (gnu,
ustar, posix) and is fully backward compatible with standard tar tools
like GNU tar, which treat the resulting multimember tar.lz archive like
any other tar.lz archive.
@uref{http://www.nongnu.org/lzip/tarlz.html,,Tarlz} is a small and simple
implementation of the tar archiver. By default tarlz creates, lists and
extracts archives in a simplified posix pax format compressed with
@uref{http://www.nongnu.org/lzip/lzip.html,,lzip} on a per file basis. Each
tar member is compressed in its own lzip member, as well as the end-of-file
blocks. This method is fully backward compatible with standard tar tools
like GNU tar, which treat the resulting multimember tar.lz archive like any
other tar.lz archive. Tarlz can append files to the end of such compressed
archives.
Tarlz can create tar archives with four levels of compression
granularity; per file, per directory, appendable solid, and solid.
Tarlz is intended as a showcase project for the maintainers of real tar
programs to evaluate the format and perhaps implement it in their tools.
The diagram below shows the correspondence between tar members (formed
by a header plus optional data) in the tar archive and
@uref{http://www.nongnu.org/lzip/manual/lzip_manual.html#File-format,,lzip members}
in the resulting multimember tar.lz archive:
@ifnothtml
@xref{File format,,,lzip}.
@end ifnothtml
@verbatim
tar
+========+======+========+======+========+======+========+
| header | data | header | data | header | data | eof |
+========+======+========+======+========+======+========+
tar.lz
+===============+===============+===============+========+
| member | member | member | member |
+===============+===============+===============+========+
@end verbatim
@noindent
Of course, compressing each file (or each directory) individually is
less efficient than compressing the whole tar archive, but it has the
@ -101,15 +79,16 @@ The resulting multimember tar.lz archive can be decompressed in
parallel with plzip, multiplying the decompression speed.
@item
New members can be appended to the archive (by removing the eof
New members can be appended to the archive (by removing the EOF
member) just like to an uncompressed tar archive.
@item
It is a safe posix-style backup format. In case of corruption,
tarlz can extract all the undamaged members from the tar.lz
archive, skipping over the damaged members, just like the standard
(uncompressed) tar. Moreover, lziprecover can be used to recover at
least part of the contents of the damaged members.
(uncompressed) tar. Moreover, the option @code{--keep-damaged} can be
used to recover as much data as possible from each damaged member,
and lziprecover can be used to recover some of the damaged members.
@item
A multimember tar.lz archive is usually smaller than the
@ -117,6 +96,15 @@ corresponding solidly compressed tar.gz archive, except when
individually compressing files smaller than about 32 KiB.
@end itemize
Tarlz protects the extended records with a CRC in a way compatible with
standard tar tools. @xref{crc32}.
Tarlz does not understand other tar formats like @samp{gnu}, @samp{oldgnu},
@samp{star} or @samp{v7}.
Tarlz is intended as a showcase project for the maintainers of real tar
programs to evaluate the format and perhaps implement it in their tools.
@node Invoking tarlz
@chapter Invoking tarlz
@ -133,9 +121,16 @@ tarlz [@var{options}] [@var{files}]
@noindent
On archive creation or appending, tarlz removes leading and trailing
slashes from file names, as well as file name prefixes containing a
slashes from filenames, as well as filename prefixes containing a
@samp{..} component. On extraction, archive members containing a
@samp{..} component are skipped.
@samp{..} component are skipped. Tarlz detects when the archive being
created or enlarged is among the files to be dumped, appended or
concatenated, and skips it.
On extraction and listing, tarlz removes leading @samp{./} strings from
member names in the archive or given in the command line, so that
@w{@code{tarlz -xf foo ./bar baz}} extracts members @samp{bar} and
@samp{./baz} from archive @samp{foo}.
tarlz supports the following options:
@ -147,10 +142,21 @@ Print an informative help message describing the options and exit.
@item -V
@itemx --version
Print the version number of tarlz on the standard output and exit.
This version number should be included in all bug reports.
@item -A
@itemx --concatenate
Append tar.lz archives to the end of a tar.lz archive. All the archives
involved must be regular (seekable) files compressed as multimember lzip
files, and the two end-of-file blocks plus any zero padding must be
contained in the last lzip member of each archive. The intermediate
end-of-file blocks are removed as each new archive is concatenated. Exit
with status 0 without modifying the archive if no @var{files} have been
specified. Tarlz can't concatenate uncompressed tar archives.
@item -c
@itemx --create
Create a new archive.
Create a new archive from @var{files}.
@item -C @var{dir}
@itemx --directory=@var{dir}
@ -174,18 +180,19 @@ Quiet operation. Suppress all messages.
@item -r
@itemx --append
Append files to the end of an archive. The archive must be a regular
(seekable) file compressed as a multimember lzip file, and the two
end-of-file blocks plus any zero padding must be contained in the last
lzip member of the archive. First this last member is removed, then the
new members are appended, and then a new end-of-file member is appended
to the archive. Exit with status 0 without modifying the archive if no
@var{files} have been specified. tarlz can't append files to an
uncompressed tar archive.
Append files to the end of a tar.lz archive. The archive must be a
regular (seekable) file compressed as a multimember lzip file, and the
two end-of-file blocks plus any zero padding must be contained in the
last lzip member of the archive. First this last member is removed, then
the new members are appended, and then a new end-of-file member is
appended to the archive. Exit with status 0 without modifying the
archive if no @var{files} have been specified. Tarlz can't append files
to an uncompressed tar archive.
@item -t
@itemx --list
List the contents of an archive.
List the contents of an archive. If @var{files} are given, list only the
given @var{files}.
@item -v
@itemx --verbose
@ -193,10 +200,13 @@ Verbosely list files processed.
@item -x
@itemx --extract
Extract files from an archive.
Extract files from an archive. If @var{files} are given, extract only
the given @var{files}. Else extract all the files in the archive.
@item -0 .. -9
Set the compression level. The default compression level is @samp{-6}.
Like lzip, tarlz also minimizes the dictionary size of the lzip members
it creates, reducing the amount of memory required for decompression.
@item --asolid
When creating or appending to a compressed archive, use appendable solid
@ -212,22 +222,55 @@ end-of-file blocks are compressed into a separate lzip member. This
creates a compressed appendable archive with a separate lzip member for
each top-level directory.
@item --no-solid
When creating or appending to a compressed archive, compress each file
separately. The end-of-file blocks are compressed into a separate lzip
member. This creates a compressed appendable archive with a separate
lzip member for each file. This option allows tarlz revert to default
behavior if, for example, tarlz is invoked through an alias like
@code{tar='tarlz --solid'}.
@item --solid
When creating or appending to a compressed archive, use solid
compression. The files being added to the archive, along with the
end-of-file blocks, are compressed into a single lzip member. The
resulting archive is not appendable. No more files can be later appended
to the archive without decompressing it first.
to the archive.
@item --anonymous
Equivalent to @code{--owner=root --group=root}.
@item --owner=@var{owner}
When creating or appending, use @var{owner} for files added to the
archive. If @var{owner} is not a valid user name, it is decoded as a
decimal numeric user ID.
@item --group=@var{group}
When creating or appending, use @var{group} for files added to the
archive. If @var{group} is not a valid group name, it is decoded as a
decimal numeric group ID.
@item --owner=@var{owner}
When creating or appending, use @var{owner} for files added to the
archive. If @var{owner} is not a valid user name, it is decoded as a
decimal numeric user ID.
@item --keep-damaged
Don't delete partially extracted files. If a decompression error happens
while extracting a file, keep the partial data extracted. Use this
option to recover as much data as possible from each damaged member.
@item --missing-crc
Exit with error status 2 if the CRC of the extended records is missing.
When this option is used, tarlz detects any corruption in the extended
records (only limited by CRC collisions). But note that a corrupt
@samp{GNU.crc32} keyword, for example @samp{GNU.crc33}, is reported as a
missing CRC instead of as a corrupt record. This misleading
@samp{Missing CRC} message is the consequence of a flaw in the posix pax
format; i.e., the lack of a mandatory check sequence in the extended
records. @xref{crc32}.
@ignore
@item --permissive
Allow some violations of the archive format, like consecutive extended
headers preceding a ustar header, or several records with the same
keyword appearing in the same block of extended records.
@end ignore
@item --uncompressed
With @code{--create}, don't compress the created tar archive. Create an
@ -241,6 +284,358 @@ invalid input file, 3 for an internal consistency error (eg, bug) which
caused tarlz to panic.
@node File format
@chapter File format
@cindex file format
In the diagram below, a box like this:
@verbatim
+---+
| | <-- the vertical bars might be missing
+---+
@end verbatim
represents one byte; a box like this:
@verbatim
+==============+
| |
+==============+
@end verbatim
represents a variable number of bytes or a fixed but large number of
bytes (for example 512).
@sp 1
A tar.lz file consists of a series of lzip members (compressed data sets).
The members simply appear one after another in the file, with no
additional information before, between, or after them.
Each lzip member contains one or more tar members in a simplified posix
pax interchange format; the only pax typeflag value supported by tarlz
(in addition to the typeflag values defined by the ustar format) is
@samp{x}. The pax format is an extension on top of the ustar format that
removes the size limitations of the ustar format.
Each tar member contains one file archived, and is represented by the
following sequence:
@itemize @bullet
@item
An optional extended header block with extended header records. This
header block is of the form described in pax header block, with a
typeflag value of @samp{x}. The extended header records are included as
the data for this header block.
@item
A header block in ustar format that describes the file. Any fields
defined in the preceding optional extended header records override the
associated fields in this header block for this file.
@item
Zero or more blocks that contain the contents of the file.
@end itemize
At the end of the archive file there are two 512-byte blocks filled with
binary zeros, interpreted as an end-of-archive indicator. These EOF
blocks are either compressed in a separate lzip member or compressed
along with the tar members contained in the last lzip member.
The diagram below shows the correspondence between each tar member
(formed by one or two headers plus optional data) in the tar archive and
each
@uref{http://www.nongnu.org/lzip/manual/lzip_manual.html#File-format,,lzip member}
in the resulting multimember tar.lz archive:
@ifnothtml
@xref{File format,,,lzip}.
@end ifnothtml
@verbatim
tar
+========+======+=================+===============+========+======+========+
| header | data | extended header | extended data | header | data | EOF |
+========+======+=================+===============+========+======+========+
tar.lz
+===============+=================================================+========+
| member | member | member |
+===============+=================================================+========+
@end verbatim
@ignore
When @code{--permissive} is used, the following violations of the
archive format are allowed:@*
If several extended headers precede an ustar header, only the last
extended header takes effect. The other extended headers are ignored.
Similarly, if several records with the same keyword appear in the same
block of extended records, only the last record for the repeated keyword
takes effect. The other records for the repeated keyword are ignored.
@end ignore
@sp 1
@section Pax header block
The pax header block is identical to the ustar header block described below
except that the typeflag has the value @samp{x} (extended). The size field
is the size of the extended header data in bytes. Most other fields in the
pax header block are zeroed on archive creation to prevent trouble if the
archive is read by an ustar tool, and are ignored by tarlz on archive
extraction. @xref{flawed-compat}.
The pax extended header data consists of one or more records, each of
them constructed as follows:@*
@code{"%d %s=%s\n", <length>, <keyword>, <value>}
The <length>, <blank>, <keyword>, <equals-sign>, and <newline> in the
record must be limited to the portable character set. The <length> field
contains the decimal length of the record in bytes, including the
trailing <newline>. The <value> field is stored as-is, without
conversion to UTF-8 nor any other transformation.
These are the <keyword> fields currently supported by tarlz:
@table @code
@item linkpath
The pathname of a link being created to another file, of any type,
previously archived. This record overrides the linkname field in the
following ustar header block. The following ustar header block
determines the type of link created. If typeflag of the following header
block is 1, it will be a hard link. If typeflag is 2, it will be a
symbolic link and the linkpath value will be used as the contents of the
symbolic link.
@item path
The pathname of the following file. This record overrides the name and
prefix fields in the following ustar header block.
@item size
The size of the file in bytes, expressed as a decimal number using
digits from the ISO/IEC 646:1991 (ASCII) standard. This record overrides
the size field in the following ustar header block. The size record is
used only for files with a size value greater than 8_589_934_591
@w{(octal 77777777777)}. This is 2^33 bytes or larger.
@anchor{key_crc32}
@item GNU.crc32
CRC32-C (Castagnoli) of the extended header data excluding the 8 bytes
representing the CRC <value> itself. The <value> is represented as 8
hexadecimal digits in big endian order,
@w{@samp{22 GNU.crc32=00000000\n}}. The keyword of the CRC record is
protected by the CRC to guarante that corruption is always detected
(except in case of CRC collision). A CRC was chosen because a checksum
is too weak for a potentially large list of variable sized records. A
checksum can't detect simple errors like the swapping of two bytes.
@end table
@sp 1
@section Ustar header block
The ustar header block has a length of 512 bytes and is structured as
shown in the following table. All lengths and offsets are in decimal.
@multitable {Field Name} {Offset} {Length (in bytes)}
@item Field Name @tab Offset @tab Length (in bytes)
@item name @tab 0 @tab 100
@item mode @tab 100 @tab 8
@item uid @tab 108 @tab 8
@item gid @tab 116 @tab 8
@item size @tab 124 @tab 12
@item mtime @tab 136 @tab 12
@item chksum @tab 148 @tab 8
@item typeflag @tab 156 @tab 1
@item linkname @tab 157 @tab 100
@item magic @tab 257 @tab 6
@item version @tab 263 @tab 2
@item uname @tab 265 @tab 32
@item gname @tab 297 @tab 32
@item devmajor @tab 329 @tab 8
@item devminor @tab 337 @tab 8
@item prefix @tab 345 @tab 155
@end multitable
All characters in the header block are coded using the ISO/IEC 646:1991
(ASCII) standard, except in fields storing names for files, users, and
groups. For maximum portability between implementations, names should
only contain characters from the portable filename character set. But if
an implementation supports the use of characters outside of @samp{/} and
the portable filename character set in names for files, users, and
groups, tarlz will use the byte values in these names unmodified.
The fields name, linkname, and prefix are null-terminated character
strings except when all characters in the array contain non-null
characters including the last character.
The name and the prefix fields produce the pathname of the file. A new
pathname is formed, if prefix is not an empty string (its first
character is not null), by concatenating prefix (up to the first null
character), a <slash> character, and name; otherwise, name is used
alone. In either case, name is terminated at the first null character.
If prefix begins with a null character, it is ignored. In this manner,
pathnames of at most 256 characters can be supported. If a pathname does
not fit in the space provided, an extended record is used to store the
pathname.
The linkname field does not use the prefix to produce a pathname. If the
linkname does not fit in the 100 characters provided, an extended record
is used to store the linkname.
The mode field provides 12 access permission bits. The following table
shows the symbolic name of each bit and its octal value:
@multitable {Bit Name} {Bit value}
@item Bit Name @tab Bit value
@item S_ISUID @tab 04000
@item S_ISGID @tab 02000
@item S_ISVTX @tab 01000
@item S_IRUSR @tab 00400
@item S_IWUSR @tab 00200
@item S_IXUSR @tab 00100
@item S_IRGRP @tab 00040
@item S_IWGRP @tab 00020
@item S_IXGRP @tab 00010
@item S_IROTH @tab 00004
@item S_IWOTH @tab 00002
@item S_IXOTH @tab 00001
@end multitable
The uid and gid fields are the user and group ID of the owner and group
of the file, respectively.
The size field contains the octal representation of the size of the file
in bytes. If the typeflag field specifies a file of type '0' (regular
file) or '7' (high performance regular file), the number of logical
records following the header is @w{(size / 512)} rounded to the next
integer. For all other values of typeflag, tarlz either sets the size
field to 0 or ignores it, and does not store or expect any logical
records following the header. If the file size is larger than
8_589_934_591 bytes @w{(octal 77777777777)}, an extended record is used
to store the file size.
The mtime field contains the octal representation of the modification
time of the file at the time it was archived, obtained from the stat()
function.
The chksum field contains the octal representation of the value of the
simple sum of all bytes in the header logical record. Each byte in the
header is treated as an unsigned value. When calculating the checksum,
the chksum field is treated as if it were all <space> characters.
The typeflag field contains a single character specifying the type of
file archived:
@table @code
@item '0'
Regular file.
@item '1'
Hard link to another file, of any type, previously archived.
@item '2'
Symbolic link.
@item '3', '4'
Character special file and block special file respectively. In this case
the devmajor and devminor fields contain information defining the
device in unspecified format.
@item '5'
Directory.
@item '6'
FIFO special file.
@item '7'
Reserved to represent a file to which an implementation has associated
some high-performance attribute. Tarlz treats this type of file as a
regular file (type 0).
@end table
The magic field contains the ASCII null-terminated string "ustar". The
version field contains the characters "00" (0x30,0x30). The fields
uname, and gname are null-terminated character strings. Each numeric
field contains a leading zero-filled, null-terminated octal number using
digits from the ISO/IEC 646:1991 (ASCII) standard.
@node Amendments to pax format
@chapter The reasons for the differences with pax
@cindex Amendments to pax format
Tarlz is meant to reliably detect invalid or corrupt metadata during
extraction and to not create safety risks in the archives it creates. In
order to achieve these goals, tarlz makes some changes to the variant of the
pax format that it uses. This chapter describes these changes and the
concrete reasons to implement them.
@sp 1
@anchor{crc32}
@section Add a CRC of the extended records
The posix pax format has a serious flaw. The metadata stored in pax extended
records are not protected by any kind of check sequence. Corruption in a
long filename may cause the extraction of the file in the wrong place
without warning. Corruption in a long file size may cause the truncation of
the file or the appending of garbage to the file, both followed by a
spurious warning about a corrupt header far from the place of the undetected
corruption.
Metadata like filename and file size must be always protected in an archive
format because of the adverse effects of undetected corruption in them,
potentially much worse that undetected corruption in the data. Even more so
in the case of pax because the amount of metadata it stores is potentially
large, making undetected corruption more probable.
Because of the above, tarlz protects the extended records with a CRC in
a way compatible with standard tar tools. @xref{key_crc32}.
@sp 1
@anchor{flawed-compat}
@section Remove flawed backward compatibility
In order to allow the extraction of pax archives by a tar utility conforming
to the POSIX-2:1993 standard, POSIX.1-2008 recommends selecting extended
header field values that allow such tar to create a regular file containing
the extended header records as data. This approach is broken because if the
extended header is needed because of a long filename, the name and prefix
fields will be unable to contain the full pathname of the file. Therefore
the files corresponding to both the extended header and the overridden ustar
header will be extracted using truncated filenames, perhaps overwriting
existing files or directories. It may be a security risk to extract a file
with a truncated filename.
To avoid this problem, tarlz writes extended headers with all fields zeroed
except size, chksum, typeflag, magic and version. This prevents old tar
programs from extracting the extended records as a file in the wrong place.
Tarlz also sets to zero those fields of the ustar header overridden by
extended records.
If the extended header is needed because of a file size larger than
@w{8 GiB}, the size field will be unable to contain the full size of the
file. Therefore the file may be partially extracted, and the tool will issue
a spurious warning about a corrupt header at the point where it thinks the
file ends. Setting to zero the overridden size in the ustar header at least
prevents the partial extraction and makes obvious that the file has been
truncated.
@sp 1
@section As simple as possible (but not simpler)
The tarlz format is mainly ustar. Extended pax headers are used only when
needed because the length of a filename or link name, or the size of a file
exceed the limits of the ustar format. Adding extended headers to each
member just to record subsecond timestamps seems wasteful for a backup
format.
@sp 1
@section Avoid misconversions to/from UTF-8
There is no portable way to tell what charset a text string is coded into.
Therefore, tarlz stores all fields representing text strings as-is, without
conversion to UTF-8 nor any other transformation. This prevents accidental
double UTF-8 conversions. If the need arises this behavior will be adjusted
with a command line option in the future.
@node Examples
@chapter A small tutorial with examples
@cindex examples
@ -280,7 +675,7 @@ Example 4: Create a compressed appendable archive containing directories
directory. Then append files @samp{a}, @samp{b}, @samp{c}, @samp{d} and
@samp{e} to the archive, all of them contained in a single lzip member.
The resulting archive @samp{archive.tar.lz} contains 5 lzip members
(including the eof member).
(including the EOF member).
@example
tarlz --dsolid -cf archive.tar.lz dir1 dir2 dir3
@ -291,8 +686,7 @@ tarlz --asolid -rf archive.tar.lz a b c d e
@noindent
Example 5: Create a solidly compressed archive @samp{archive.tar.lz}
containing files @samp{a}, @samp{b} and @samp{c}. Note that no more
files can be later appended to the archive without decompressing it
first.
files can be later appended to the archive.
@example
tarlz --solid -cf archive.tar.lz a b c

398
extract.cc
View file

@ -28,6 +28,10 @@
#include <unistd.h>
#include <utime.h>
#include <sys/stat.h>
#include <sys/types.h>
#if defined(__GNU_LIBRARY__)
#include <sys/sysmacros.h> // for makedev
#endif
#include <lzlib.h>
#include "arg_parser.h"
@ -38,6 +42,17 @@
namespace {
int gretval = 0;
bool has_lz_ext; // global var for archive_read
void skip_warn( const bool reset = false ) // avoid duplicate warnings
{
static bool skipping = false;
if( reset ) skipping = false;
else if( !skipping )
{ skipping = true; show_error( "Skipping to next header." ); }
}
bool make_path( const std::string & name )
{
@ -68,42 +83,6 @@ bool make_path( const std::string & name )
}
// Returns in buf the first rd bytes of the second lzip member or
// the first 512 bytes of the second tar member, and sets islz if lzip member
bool skip_first_member( const int infd, uint8_t * const buf,
int & rd, bool & islz )
{
while( true )
{
for( int i = 0; i < rd; ++i )
if( buf[i] == 'L' && (*(Lzip_header *)( buf + i )).verify_prefix( rd - i ) )
{
const int ts = rd - i; // tail size
std::memmove( buf, buf + i, ts );
if( ts >= (int)sizeof lzip_magic )
{ rd = ts; islz = true; return true; }
int rd2 = readblock( infd, buf + ts, header_size - ts );
if( rd2 != header_size - ts && errno )
{ show_error( "Error reading archive", errno ); return false; }
if( ts + rd2 >= min_member_size &&
(*(Lzip_header *)buf).verify_magic() )
{ rd = ts + rd2; islz = true; return true; }
std::memmove( buf, buf + ts, rd2 );
int rd3 = readblock( infd, buf + rd2, header_size - rd2 );
if( rd3 != header_size - rd2 && errno )
{ show_error( "Error reading archive", errno ); return false; }
rd = rd2 + rd3; i = -1;
}
if( rd < header_size ) return false; // eof
if( rd == header_size && verify_ustar_chksum( buf ) )
{ islz = false; return true; }
rd = readblock( infd, buf, header_size );
if( rd != header_size && errno )
{ show_error( "Error reading archive", errno ); return false; }
}
}
inline bool block_is_zero( const uint8_t * const buf, const int size )
{
for( int i = 0; i < size; ++i ) if( buf[i] != 0 ) return false;
@ -111,58 +90,83 @@ inline bool block_is_zero( const uint8_t * const buf, const int size )
}
bool archive_read( const int infd, uint8_t * const buf, const int size )
// Return value: 0 = OK, 1 = damaged member, 2 = fatal error.
// If sizep and error, return in *sizep the number of bytes read.
// The first 6 bytes of the archive must be intact for islz to be meaningful.
int archive_read( const int infd, uint8_t * const buf, const int size,
int * const sizep = 0 )
{
static LZ_Decoder * decoder = 0;
static bool first_call = true;
static bool at_eof = false;
static bool fatal = false;
static bool first_call = true;
if( sizep ) *sizep = 0;
if( fatal ) return 2;
if( first_call ) // check format
{
first_call = false;
if( size != header_size )
internal_error( "size != header_size on first call." );
int rd = readblock( infd, buf, size );
const int rd = readblock( infd, buf, size );
if( sizep ) *sizep = rd;
if( rd != size && errno )
{ show_error( "Error reading archive", errno ); return false; }
bool islz =
( rd >= min_member_size && (*(Lzip_header *)buf).verify_magic() );
{ show_error( "Error reading archive", errno ); fatal = true; return 2; }
const Lzip_header & header = (*(const Lzip_header *)buf);
bool islz = ( rd >= min_member_size && header.verify_magic() &&
isvalid_ds( header.dictionary_size() ) );
const bool istar = ( rd == size && verify_ustar_chksum( buf ) );
const bool iseof =
( !islz && !istar && rd == size && block_is_zero( buf, size ) );
if( !islz && !istar && !iseof )
if( !islz && !istar && !iseof ) // corrupt or invalid format
{
show_error( "This does not look like a tar archive." );
show_error( "Skipping to next header." );
// std::fprintf( stderr, "%07o\n", ustar_chksum( buf ) );
gretval = 2;
if( !skip_first_member( infd, buf, rd, islz ) ) return false;
show_error( "This does not look like a POSIX tar archive." );
if( has_lz_ext ) islz = true;
if( verbosity >= 2 && !islz && rd == size )
std::fprintf( stderr, "ustar chksum = %07o\n", ustar_chksum( buf ) );
if( !islz ) return 1;
}
if( !islz ) return true; // uncompressed
if( !islz ) // uncompressed
{ if( rd == size ) return 0; fatal = true; return 2; }
decoder = LZ_decompress_open(); // compressed
if( !decoder || LZ_decompress_errno( decoder ) != LZ_ok )
{ show_error( "Not enough memory." );
LZ_decompress_close( decoder ); return false; }
LZ_decompress_close( decoder ); fatal = true; return 2; }
if( LZ_decompress_write( decoder, buf, rd ) != rd )
internal_error( "library error (LZ_decompress_write)." );
if( !archive_read( infd, buf, size ) ) return false;
if( verify_ustar_chksum( buf ) || block_is_zero( buf, size ) ) return true;
show_error( "This does not look like a tar archive." );
show_error( "Skipping to next header." );
gretval = 2;
if( LZ_decompress_sync_to_member( decoder ) < 0 )
internal_error( "library error (LZ_decompress_sync_to_member)." );
const int res = archive_read( infd, buf, size, sizep );
if( res != 0 ) { if( res == 2 ) fatal = true; return res; }
if( verify_ustar_chksum( buf ) || block_is_zero( buf, size ) ) return 0;
show_error( "This does not look like a POSIX tar.lz archive." );
fatal = true; return 2;
}
if( !decoder ) // uncompressed
{ if( readblock( infd, buf, size ) == size ) return true;
show_error( "Archive ends unexpectedly." ); return false; }
{
const int rd = readblock( infd, buf, size ); if( rd == size ) return 0;
if( sizep ) *sizep = rd;
show_error( "Archive ends unexpectedly." ); fatal = true; return 2;
}
const int ibuf_size = 16384;
uint8_t ibuf[ibuf_size];
int sz = 0;
while( sz < size )
{
if( !at_eof && LZ_decompress_write_size( decoder ) > 0 )
const int rd = LZ_decompress_read( decoder, buf + sz, size - sz );
if( rd < 0 )
{
if( LZ_decompress_sync_to_member( decoder ) < 0 )
internal_error( "library error (LZ_decompress_sync_to_member)." );
skip_warn(); gretval = 2; return 1;
}
if( rd == 0 && LZ_decompress_finished( decoder ) == 1 )
{ LZ_decompress_close( decoder );
show_error( "Archive ends unexpectedly." ); fatal = true; return 2; }
sz += rd; if( sizep ) *sizep = sz;
if( sz == size && LZ_decompress_finished( decoder ) == 1 &&
LZ_decompress_close( decoder ) < 0 )
{ show_error( "LZ_decompress_close failed." ); fatal = true; return 2; }
if( sz < size && !at_eof && LZ_decompress_write_size( decoder ) > 0 )
{
const int rsize = std::min( ibuf_size, LZ_decompress_write_size( decoder ) );
const int rd = readblock( infd, ibuf, rsize );
@ -172,27 +176,12 @@ bool archive_read( const int infd, uint8_t * const buf, const int size )
{
at_eof = true; LZ_decompress_finish( decoder );
if( errno )
{ show_error( "Error reading archive", errno ); return false; }
{ show_error( "Error reading archive", errno ); fatal = true;
return 2; }
}
}
const int rd = LZ_decompress_read( decoder, buf + sz, size - sz );
if( rd < 0 )
{
show_error( "Skipping to next header." );
gretval = 2;
if( LZ_decompress_sync_to_member( decoder ) < 0 )
internal_error( "library error (LZ_decompress_sync_to_member)." );
continue;
}
if( rd == 0 && LZ_decompress_finished( decoder ) == 1 )
{ LZ_decompress_close( decoder );
show_error( "Archive ends unexpectedly." ); return false; }
sz += rd;
if( sz == size && LZ_decompress_finished( decoder ) == 1 &&
LZ_decompress_close( decoder ) < 0 )
{ show_error( "LZ_decompress_close failed." ); return false; }
}
return true;
return 0;
}
@ -251,55 +240,44 @@ const char * user_group_string( const Tar_header header )
}
const char * link_string( const Tar_header header )
{
enum { bufsize = 9 + linkname_l + 1 };
static char buf[bufsize];
const Typeflag typeflag = (Typeflag)header[typeflag_o];
if( typeflag == tf_link )
snprintf( buf, bufsize, " link to %.100s", header + linkname_o );
else if( typeflag == tf_symlink )
snprintf( buf, bufsize, " -> %.100s", header + linkname_o );
else buf[0] = 0;
return buf;
}
void show_member_name( const char * const filename, const Tar_header header,
void show_member_name( const Extended & extended, const Tar_header header,
const int vlevel )
{
if( verbosity < vlevel ) return;
if( verbosity > vlevel )
{
const time_t mtime = strtoull( header + mtime_o, 0, 8 ); // 33 bits
struct tm * tm = localtime( &mtime );
std::printf( "%s %s %9llu %4d-%02u-%02u %02u:%02u %s%s\n",
const struct tm * const tm = localtime( &mtime );
const Typeflag typeflag = (Typeflag)header[typeflag_o];
const bool islink = ( typeflag == tf_link || typeflag == tf_symlink );
const char * const link_string = !islink ? "" :
( ( typeflag == tf_link ) ? " link to " : " -> " );
std::printf( "%s %s %9llu %4d-%02u-%02u %02u:%02u %s%s%s\n",
mode_string( header ), user_group_string( header ),
strtoull( header + size_o, 0, 8 ), 1900 + tm->tm_year,
1 + tm->tm_mon, tm->tm_mday, tm->tm_hour, tm->tm_min,
filename, link_string( header ) );
extended.size, 1900 + tm->tm_year, 1 + tm->tm_mon,
tm->tm_mday, tm->tm_hour, tm->tm_min, extended.path.c_str(),
link_string, !islink ? "" : extended.linkpath.c_str() );
}
else std::printf( "%s\n", filename );
else std::printf( "%s\n", extended.path.c_str() );
std::fflush( stdout );
}
int list_member( const int infd, const char * const filename,
const unsigned long long file_size, const Tar_header header,
const bool skip )
int list_member( const int infd, const Extended & extended,
const Tar_header header, const bool skip )
{
if( !skip ) show_member_name( filename, header, 0 );
if( !skip ) show_member_name( extended, header, 0 );
const unsigned bufsize = 32 * header_size;
uint8_t buf[bufsize];
unsigned long long rest = file_size;
const int rem = file_size % header_size;
unsigned long long rest = extended.size;
const int rem = extended.size % header_size;
const int padding = rem ? header_size - rem : 0;
while( rest > 0 )
{
const int rsize = ( rest >= bufsize ) ? bufsize : rest + padding;
if( !archive_read( infd, buf, rsize ) ) return 2;
const int ret = archive_read( infd, buf, rsize );
if( ret != 0 ) { if( ret == 2 ) return 2; else break; }
if( rest < bufsize ) break;
rest -= rsize;
}
@ -317,13 +295,14 @@ bool contains_dotdot( const char * const filename )
}
int extract_member( const int infd, const char * const filename,
const unsigned long long file_size, const Tar_header header )
int extract_member( const int infd, const Extended & extended,
const Tar_header header, const bool keep_damaged )
{
const char * const filename = extended.path.c_str();
if( contains_dotdot( filename ) )
{
show_file_error( filename, "Contains a '..' component, skipping." );
return list_member( infd, filename, file_size, header, true );
return list_member( infd, extended, header, true );
}
const mode_t mode = strtoul( header + mode_o, 0, 8 ); // 12 bits
const time_t mtime = strtoull( header + mtime_o, 0, 8 ); // 33 bits
@ -331,7 +310,7 @@ int extract_member( const int infd, const char * const filename,
const bool islink = ( typeflag == tf_link || typeflag == tf_symlink );
int outfd = -1;
show_member_name( filename, header, 1 );
show_member_name( extended, header, 1 );
std::remove( filename );
make_path( filename );
switch( typeflag )
@ -345,14 +324,12 @@ int extract_member( const int infd, const char * const filename,
case tf_link:
case tf_symlink:
{
char linkname[linkname_l+1];
std::memcpy( linkname, header + linkname_o, linkname_l );
linkname[linkname_l] = 0;
const char * const linkname = extended.linkpath.c_str();
/* if( contains_dotdot( linkname ) )
{
show_file_error( filename,
"Link destination contains a '..' component, skipping." );
return list_member( infd, filename, file_size, header, false );
return list_member( infd, extended, header, false );
}*/
const bool hard = typeflag == tf_link;
if( ( hard && link( linkname, filename ) != 0 ) ||
@ -410,15 +387,25 @@ int extract_member( const int infd, const char * const filename,
const unsigned bufsize = 32 * header_size;
uint8_t buf[bufsize];
unsigned long long rest = file_size;
const int rem = file_size % header_size;
unsigned long long rest = extended.size;
const int rem = extended.size % header_size;
const int padding = rem ? header_size - rem : 0;
while( rest > 0 )
{
const int rsize = ( rest >= bufsize ) ? bufsize : rest + padding;
if( !archive_read( infd, buf, rsize ) )
{ if( outfd >= 0 ) { close( outfd ); std::remove( filename ); }
return 2; }
int rd;
const int ret = archive_read( infd, buf, rsize, &rd );
if( ret != 0 )
{
if( outfd >= 0 )
{
if( keep_damaged )
{ writeblock( outfd, buf, std::min( rest, (unsigned long long)rd ) );
close( outfd ); }
else { close( outfd ); std::remove( filename ); }
}
if( ret == 2 ) return 2; else return 0;
}
const int wsize = ( rest >= bufsize ) ? bufsize : rest;
if( outfd >= 0 && writeblock( outfd, buf, wsize ) != wsize )
{ show_file_error( filename, "Error writing file", errno ); return 2; }
@ -437,6 +424,7 @@ int extract_member( const int infd, const char * const filename,
}
// Removes any amount of leading "./" and '/' strings.
const char * remove_leading_slash( const char * const filename )
{
static bool first_post = true;
@ -479,73 +467,173 @@ bool compare_tslash( const char * const name1, const char * const name2 )
} // end namespace
bool Extended::parse( const int infd, const Tar_header header,
const bool permissive )
{
const unsigned long long edsize = strtoull( header + size_o, 0, 8 );
const unsigned long long bufsize = round_up( edsize );
if( bufsize == 0 || edsize == 0 || edsize >= 1ULL << 33 )
return false; // overflow or no extended data
char * const buf = new char[bufsize]; // extended records buffer
if( archive_read( infd, (uint8_t *)buf, bufsize ) != 0 ) goto error;
for( unsigned long long pos = 0; pos < edsize; ) // parse records
{
char * tail;
const unsigned long long rsize = strtoull( buf + pos, &tail, 10 );
if( rsize == 0 || rsize > edsize - pos || tail[0] != ' ' ||
buf[pos+rsize-1] != '\n' ) goto error;
++tail; // point to keyword
// length of (keyword + '=' + value) without the final newline
const unsigned long long rest = ( buf + pos + rsize - 1 ) - tail;
if( rest > 5 && std::memcmp( tail, "path=", 5 ) == 0 )
{ if( path.size() && !permissive ) goto error;
path.assign( tail + 5, rest - 5 ); }
else if( rest > 9 && std::memcmp( tail, "linkpath=", 9 ) == 0 )
{ if( linkpath.size() && !permissive ) goto error;
linkpath.assign( tail + 9, rest - 9 ); }
else if( rest > 5 && std::memcmp( tail, "size=", 5 ) == 0 )
{
if( size != 0 && !permissive ) goto error;
size = 0;
for( unsigned long long i = 5; i < rest; ++i )
{
if( tail[i] < '0' || tail[i] > '9' ) goto error;
const unsigned long long prev = size;
size = size * 10 + ( tail[i] - '0' );
if( size < prev ) goto error; // overflow
}
if( size < 1ULL << 33 ) goto error; // size fits in ustar header
}
else if( rest > 10 && std::memcmp( tail, "GNU.crc32=", 10 ) == 0 )
{
if( crc_present && !permissive ) goto error;
if( rsize != 22 ) goto error;
char * t;
const uint32_t stored_crc = strtoul( tail + 10, &t, 16 );
if( t - tail - 10 != 8 || t[0] != '\n' ) goto error;
const uint32_t computed_crc =
crc32c.windowed_crc( (const uint8_t *)buf, pos + rsize - 9, edsize );
crc_present = true;
if( stored_crc != computed_crc ) goto error;
}
pos += rsize;
}
delete[] buf;
return true;
error:
delete[] buf;
return false;
}
int decode( const std::string & archive_name, const Arg_parser & parser,
const int filenames, const bool listing )
const int filenames, const bool keep_damaged, const bool listing,
const bool missing_crc, const bool permissive )
{
const int infd = archive_name.size() ?
open_instream( archive_name ) : STDIN_FILENO;
if( infd < 0 ) return 1;
// execute -C options and mark filenames to be extracted or listed
std::vector< bool > name_pending( parser.arguments(), false );
for( int i = 0; i < parser.arguments(); ++i )
{
const int code = parser.code( i );
if( code == 'C' && !listing )
{
const char * const filename = parser.argument( i ).c_str();
if( chdir( filename ) != 0 )
{ show_file_error( filename, "Error changing working directory", errno );
const char * const dir = parser.argument( i ).c_str();
if( chdir( dir ) != 0 )
{ show_file_error( dir, "Error changing working directory", errno );
return 1; }
}
if( !code ) name_pending[i] = true;
}
has_lz_ext =
( archive_name.size() > 3 &&
archive_name.compare( archive_name.size() - 3, 3, ".lz" ) == 0 ) ||
( archive_name.size() > 4 &&
archive_name.compare( archive_name.size() - 4, 4, ".tlz" ) == 0 );
Extended extended; // metadata from extended records
int retval = 0;
bool skipping = false;
bool prev_extended = false; // prev header was extended
while( true ) // process one member per iteration
{
uint8_t buf[header_size];
if( !archive_read( infd, buf, header_size ) ) return 2;
if( !verify_ustar_chksum( buf ) )
const int ret = archive_read( infd, buf, header_size );
if( ret == 2 ) return 2;
if( ret != 0 || !verify_ustar_chksum( buf ) )
{
if( block_is_zero( buf, header_size ) ) break;
gretval = 2;
if( !skipping )
{ skipping = true; show_error( "Skipping to next header." ); }
continue;
if( ret == 0 && block_is_zero( buf, header_size ) ) break; // EOF
skip_warn(); gretval = 2; continue;
}
skipping = false;
skip_warn( true ); // reset warning
const char * const header = (const char *)buf;
enum { max_filename_size = prefix_l + 1 + name_l + 1 };
char stored_name[max_filename_size];
int len = 0;
while( len < prefix_l && header[prefix_o+len] )
{ stored_name[len] = header[prefix_o+len]; ++len; }
if( len && header[name_o] ) stored_name[len++] = '/';
for( int i = 0; i < name_l && header[name_o+i]; ++i )
{ stored_name[len] = header[name_o+i]; ++len; }
while( len > 0 && stored_name[len-1] == '/' ) --len; // trailing '/'
stored_name[len] = 0;
const char * const filename = remove_leading_slash( stored_name );
const Typeflag typeflag = (Typeflag)header[typeflag_o];
if( typeflag == tf_extended )
{
if( prev_extended && !permissive )
{ show_error( "Format violation: consecutive extended headers found."
/*" Use --permissive."*/, 0, true ); return 2; }
if( !extended.parse( infd, header, permissive ) )
{ show_error( "Error in extended records. Skipping to next header." );
extended.reset(); gretval = 2; }
else if( !extended.crc_present && missing_crc )
{ show_error( "Missing CRC in extended records.", 0, true ); return 2; }
prev_extended = true;
continue;
}
prev_extended = false;
if( extended.linkpath.empty() )
{
for( int i = 0; i < linkname_l && header[linkname_o+i]; ++i )
extended.linkpath += header[linkname_o+i];
while( extended.linkpath.size() > 1 && // trailing '/'
extended.linkpath[extended.linkpath.size()-1] == '/' )
extended.linkpath.resize( extended.linkpath.size() - 1 );
}
if( extended.path.empty() )
{
char stored_name[prefix_l+1+name_l+1];
int len = 0;
while( len < prefix_l && header[prefix_o+len] )
{ stored_name[len] = header[prefix_o+len]; ++len; }
if( len && header[name_o] ) stored_name[len++] = '/';
for( int i = 0; i < name_l && header[name_o+i]; ++i )
{ stored_name[len] = header[name_o+i]; ++len; }
while( len > 0 && stored_name[len-1] == '/' ) --len; // trailing '/'
stored_name[len] = 0;
extended.path = remove_leading_slash( stored_name );
}
const char * const filename = extended.path.c_str();
bool skip = filenames > 0;
if( skip )
for( int i = 0; i < parser.arguments(); ++i )
if( parser.code( i ) == 0 &&
( compare_prefix_dir( parser.argument( i ).c_str(), filename ) ||
compare_tslash( filename, parser.argument( i ).c_str() ) ) )
{ skip = false; name_pending[i] = false; break; }
if( parser.code( i ) == 0 )
{
const char * const name =
remove_leading_slash( parser.argument( i ).c_str() );
if( compare_prefix_dir( name, filename ) ||
compare_tslash( name, filename ) )
{ skip = false; name_pending[i] = false; break; }
}
if( extended.size == 0 &&
( typeflag == tf_regular || typeflag == tf_hiperf ) )
extended.size = strtoull( header + size_o, 0, 8 );
const Typeflag typeflag = (Typeflag)header[typeflag_o];
const unsigned long long file_size =
( typeflag == tf_regular || typeflag == tf_hiperf ) ?
strtoull( header + size_o, 0, 8 ) : 0;
if( listing || skip )
retval = list_member( infd, filename, file_size, header, skip );
retval = list_member( infd, extended, header, skip );
else
retval = extract_member( infd, filename, file_size, header );
if( retval ) return retval;
retval = extract_member( infd, extended, header, keep_damaged );
extended.reset();
if( retval )
{ show_error( "Error is not recoverable: exiting now." );
return retval; }
}
for( int i = 0; i < parser.arguments(); ++i )

121
main.cc
View file

@ -40,6 +40,7 @@
#if defined(__OS2__)
#include <io.h>
#endif
#include <lzlib.h>
#include "arg_parser.h"
#include "tarlz.h"
@ -56,21 +57,33 @@ int verbosity = 0;
namespace {
const char * const Program_name = "Tarlz";
const char * const program_name = "tarlz";
const char * const program_year = "2018";
const char * invocation_name = 0;
enum Mode { m_none, m_append, m_create, m_extract, m_list };
enum Mode { m_none, m_append, m_concatenate, m_create, m_extract, m_list };
void show_help()
{
std::printf( "%s - Archiver with multimember lzip compression.\n", Program_name );
std::printf( "\nUsage: %s [options] [files]\n", invocation_name );
std::printf( "Tarlz is a small and simple implementation of the tar archiver. By default\n"
"tarlz creates, lists and extracts archives in a simplified posix pax format\n"
"compressed with lzip on a per file basis. Each tar member is compressed in\n"
"its own lzip member, as well as the end-of-file blocks. This method is fully\n"
"backward compatible with standard tar tools like GNU tar, which treat the\n"
"resulting multimember tar.lz archive like any other tar.lz archive. Tarlz\n"
"can append files to the end of such compressed archives.\n"
"\nThe tarlz file format is a safe posix-style backup format. In case of\n"
"corruption, tarlz can extract all the undamaged members from the tar.lz\n"
"archive, skipping over the damaged members, just like the standard\n"
"(uncompressed) tar. Moreover, the option '--keep-damaged' can be used to\n"
"recover as much data as possible from each damaged member, and lziprecover\n"
"can be used to recover some of the damaged members.\n"
"\nUsage: %s [options] [files]\n", invocation_name );
std::printf( "\nOptions:\n"
" -h, --help display this help and exit\n"
" -V, --version output version information and exit\n"
" -A, --concatenate append tar.lz archives to the end of an archive\n"
" -c, --create create a new archive\n"
" -C, --directory=<dir> change to directory <dir>\n"
" -f, --file=<archive> use archive file <archive>\n"
@ -82,10 +95,15 @@ void show_help()
" -0 .. -9 set compression level [default 6]\n"
" --asolid create solidly compressed appendable archive\n"
" --dsolid create per-directory compressed archive\n"
" --no-solid create per-file compressed archive (default)\n"
" --solid create solidly compressed archive\n"
" --group=<group> use <group> name/id for added files\n"
" --owner=<owner> use <owner> name/id for added files\n"
" --uncompressed don't compress the created archive\n"
" --anonymous equivalent to '--owner=root --group=root'\n"
" --owner=<owner> use <owner> name/ID for files added\n"
" --group=<group> use <group> name/ID for files added\n"
" --keep-damaged don't delete partially extracted files\n"
" --missing-crc exit with error status if missing extended CRC\n"
// " --permissive allow repeated extended headers and records\n"
" --uncompressed don't compress the archive created\n"
"\nExit status: 0 for a normal exit, 1 for environmental problems (file\n"
"not found, invalid flags, I/O errors, etc), 2 to indicate a corrupt or\n"
"invalid input file, 3 for an internal consistency error (eg, bug) which\n"
@ -99,6 +117,7 @@ void show_version()
{
std::printf( "%s %s\n", program_name, PROGVERSION );
std::printf( "Copyright (C) %s Antonio Diaz Diaz.\n", program_year );
std::printf( "Using lzlib %s\n", LZ_version() );
std::printf( "License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl.html>\n"
"This is free software: you are free to change and redistribute it.\n"
"There is NO WARRANTY, to the extent permitted by law.\n" );
@ -280,39 +299,53 @@ int main( const int argc, const char * const argv[] )
std::string archive_name;
Mode program_mode = m_none;
int level = 6; // compression level, < 0 = uncompressed
bool keep_damaged = false;
bool missing_crc = false;
bool permissive = false;
invocation_name = argv[0];
enum { opt_aso = 256, opt_dso, opt_grp, opt_own, opt_sol, opt_un };
if( LZ_version()[0] < '1' )
{ show_error( "Bad library version. At least lzlib 1.0 is required." );
return 1; }
enum { opt_ano = 256, opt_aso, opt_crc, opt_dso, opt_grp, opt_kd, opt_nso,
opt_own, opt_per, opt_sol, opt_un };
const Arg_parser::Option options[] =
{
{ '0', 0, Arg_parser::no },
{ '1', 0, Arg_parser::no },
{ '2', 0, Arg_parser::no },
{ '3', 0, Arg_parser::no },
{ '4', 0, Arg_parser::no },
{ '5', 0, Arg_parser::no },
{ '6', 0, Arg_parser::no },
{ '7', 0, Arg_parser::no },
{ '8', 0, Arg_parser::no },
{ '9', 0, Arg_parser::no },
{ 'c', "create", Arg_parser::no },
{ 'C', "directory", Arg_parser::yes },
{ 'f', "file", Arg_parser::yes },
{ 'h', "help", Arg_parser::no },
{ 'H', "format", Arg_parser::yes },
{ 'q', "quiet", Arg_parser::no },
{ 'r', "append", Arg_parser::no },
{ 't', "list", Arg_parser::no },
{ 'v', "verbose", Arg_parser::no },
{ 'V', "version", Arg_parser::no },
{ 'x', "extract", Arg_parser::no },
{ opt_aso, "asolid", Arg_parser::no },
{ opt_dso, "dsolid", Arg_parser::no },
{ opt_grp, "group", Arg_parser::yes },
{ opt_own, "owner", Arg_parser::yes },
{ opt_sol, "solid", Arg_parser::no },
{ opt_un, "uncompressed", Arg_parser::no },
{ 0 , 0, Arg_parser::no } };
{ '0', 0, Arg_parser::no },
{ '1', 0, Arg_parser::no },
{ '2', 0, Arg_parser::no },
{ '3', 0, Arg_parser::no },
{ '4', 0, Arg_parser::no },
{ '5', 0, Arg_parser::no },
{ '6', 0, Arg_parser::no },
{ '7', 0, Arg_parser::no },
{ '8', 0, Arg_parser::no },
{ '9', 0, Arg_parser::no },
{ 'A', "concatenate", Arg_parser::no },
{ 'c', "create", Arg_parser::no },
{ 'C', "directory", Arg_parser::yes },
{ 'f', "file", Arg_parser::yes },
{ 'h', "help", Arg_parser::no },
{ 'H', "format", Arg_parser::yes },
{ 'q', "quiet", Arg_parser::no },
{ 'r', "append", Arg_parser::no },
{ 't', "list", Arg_parser::no },
{ 'v', "verbose", Arg_parser::no },
{ 'V', "version", Arg_parser::no },
{ 'x', "extract", Arg_parser::no },
{ opt_ano, "anonymous", Arg_parser::no },
{ opt_aso, "asolid", Arg_parser::no },
{ opt_dso, "dsolid", Arg_parser::no },
{ opt_grp, "group", Arg_parser::yes },
{ opt_kd, "keep-damaged", Arg_parser::no },
{ opt_crc, "missing-crc", Arg_parser::no },
{ opt_nso, "no-solid", Arg_parser::no },
{ opt_own, "owner", Arg_parser::yes },
{ opt_per, "permissive", Arg_parser::no },
{ opt_sol, "solid", Arg_parser::no },
{ opt_un, "uncompressed", Arg_parser::no },
{ 0 , 0, Arg_parser::no } };
const Arg_parser parser( argc, argv, options, true );
if( parser.error().size() ) // bad option
@ -330,6 +363,7 @@ int main( const int argc, const char * const argv[] )
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
level = code - '0'; break;
case 'A': set_mode( program_mode, m_concatenate ); break;
case 'c': set_mode( program_mode, m_create ); break;
case 'C': break; // skip chdir
case 'f': if( sarg != "-" ) archive_name = sarg; break;
@ -341,12 +375,17 @@ int main( const int argc, const char * const argv[] )
case 'v': if( verbosity < 4 ) ++verbosity; break;
case 'V': show_version(); return 0;
case 'x': set_mode( program_mode, m_extract ); break;
case opt_ano: set_owner( "root" ); set_group( "root" ); break;
case opt_aso: cl_solid = 2; break;
case opt_crc: missing_crc = true; break;
case opt_dso: cl_solid = 1; break;
case opt_grp: set_group( arg ); break;
case opt_kd: keep_damaged = true; break;
case opt_nso: cl_solid = 0; break;
case opt_own: set_owner( arg ); break;
case opt_per: permissive = true; break;
case opt_sol: cl_solid = 3; break;
case opt_un: level = -1; break;
case opt_un: level = -1; break;
default : internal_error( "uncaught option" );
}
} // end process options
@ -358,12 +397,14 @@ int main( const int argc, const char * const argv[] )
switch( program_mode )
{
case m_none: show_error( "Missing operation.", 0, true ); return 2;
case m_none: show_error( "Missing operation.", 0, true ); return 2;
case m_append:
case m_create: return encode( archive_name, parser, filenames, level,
program_mode == m_append );
case m_concatenate: return concatenate( archive_name, parser, filenames );
case m_extract:
case m_list:
return decode( archive_name, parser, filenames, program_mode == m_list );
case m_list: return decode( archive_name, parser, filenames,
keep_damaged, program_mode == m_list,
missing_crc, permissive );
}
}

70
tarlz.h
View file

@ -32,7 +32,8 @@ enum Lengths {
enum Typeflag {
tf_regular = '0', tf_link = '1', tf_symlink = '2', tf_chardev = '3',
tf_blockdev = '4', tf_directory = '5', tf_fifo = '6', tf_hiperf = '7' };
tf_blockdev = '4', tf_directory = '5', tf_fifo = '6', tf_hiperf = '7',
tf_extended = 'x' };
const uint8_t ustar_magic[magic_l] =
{ 0x75, 0x73, 0x74, 0x61, 0x72, 0 }; // "ustar\0"
@ -41,6 +42,68 @@ inline bool verify_ustar_magic( const uint8_t * const buf )
{ return std::memcmp( buf + magic_o, ustar_magic, magic_l ) == 0; }
class CRC32C // Uses CRC32-C (Castagnoli) polynomial.
{
uint32_t data[256]; // Table of CRCs of all 8-bit messages.
public:
CRC32C()
{
for( unsigned n = 0; n < 256; ++n )
{
unsigned c = n;
for( int k = 0; k < 8; ++k )
{ if( c & 1 ) c = 0x82F63B78U ^ ( c >> 1 ); else c >>= 1; }
data[n] = c;
}
}
void update_buf( uint32_t & crc, const uint8_t * const buffer,
const int size ) const
{
uint32_t c = crc;
for( int i = 0; i < size; ++i )
c = data[(c^buffer[i])&0xFF] ^ ( c >> 8 );
crc = c;
}
// Calculates the crc of size bytes except a window of 8 bytes at pos
uint32_t windowed_crc( const uint8_t * const buffer, const int pos,
const int size ) const
{
uint32_t crc = 0xFFFFFFFFU;
update_buf( crc, buffer, pos );
update_buf( crc, buffer + pos + 8, size - pos - 8 );
return crc ^ 0xFFFFFFFFU;
}
};
extern const CRC32C crc32c;
// Round "size" to the next multiple of header size (512).
//
inline unsigned long long round_up( unsigned long long size )
{
const int rem = size % header_size;
const int padding = rem ? header_size - rem : 0;
return size + padding;
}
struct Extended // stores metadata from/for extended records
{
std::string linkpath;
std::string path;
unsigned long long size;
bool crc_present;
Extended() : size( 0 ), crc_present( false ) {}
void reset()
{ linkpath.clear(); path.clear(); size = 0; crc_present = false; }
bool empty() { return linkpath.empty() && path.empty() && size == 0; }
bool parse( const int infd, const Tar_header header, const bool permissive );
};
// defined in create.cc
extern int cl_owner;
extern int cl_group;
@ -48,12 +111,15 @@ extern int cl_solid;
unsigned ustar_chksum( const uint8_t * const buf );
bool verify_ustar_chksum( const uint8_t * const buf );
class Arg_parser;
int concatenate( const std::string & archive_name, const Arg_parser & parser,
const int filenames );
int encode( const std::string & archive_name, const Arg_parser & parser,
const int filenames, const int level, const bool append );
// defined in extract.cc
int decode( const std::string & archive_name, const Arg_parser & parser,
const int filenames, const bool listing );
const int filenames, const bool keep_damaged, const bool listing,
const bool missing_crc, const bool permissive );
// defined in main.cc
extern int verbosity;

495
testsuite/check.sh
View file

@ -32,9 +32,16 @@ in="${testdir}"/test.txt
in_lz="${testdir}"/test.txt.lz
in_tar="${testdir}"/test.txt.tar
in_tar_lz="${testdir}"/test.txt.tar.lz
inbad1="${testdir}"/test_bad1.txt
inbad2="${testdir}"/test_bad2.txt
test3="${testdir}"/test3.tar
test3_lz="${testdir}"/test3.tar.lz
test3a_lz="${testdir}"/test3a.tar.lz
test3dir_lz="${testdir}"/test3_dir.tar.lz
test3dot_lz="${testdir}"/test3_dot.tar.lz
t155="${testdir}"/t155.tar
t155_lz="${testdir}"/t155.tar.lz
tlzit1="${testdir}"/tlz_in_tar1.tar
tlzit2="${testdir}"/tlz_in_tar2.tar
bad1="${testdir}"/test3_bad1.tar
bad2="${testdir}"/test3_bad2.tar
bad3="${testdir}"/test3_bad3.tar
@ -48,10 +55,19 @@ bad5_lz="${testdir}"/test3_bad5.tar.lz
bad6_lz="${testdir}"/test3_bad6.tar.lz
eof_lz="${testdir}"/eof.tar.lz
fail=0
lwarn=0
test_failed() { fail=1 ; printf " $1" ; [ -z "$2" ] || printf "($2)" ; }
lzlib_1_11() { [ ${lwarn} = 0 ] &&
printf "\nwarning: testing --keep-damaged requires lzlib-1.11-rc2 or newer\n$1"
lwarn=1 ; }
# Description of test files for lziprecover:
# Description of test files for tarlz:
# t155.tar[.lz] directory + file + link + eof, all with 155 char names
# test_bad1.tar.lz: truncated at offset 6000 (of 7495)
# test_bad2.tar.lz: byte at offset 6000 changed from 0x56 to 0x46
# test3.tar: 3 members (foo bar baz) + 2 zeroed 512-byte blocks
# test3_dir.tar.lz: like test3.tar.lz but members /dir/foo /dir/bar /dir/baz
# test3_dot.tar.lz: like test3.tar.lz but members ./foo ./bar ./baz
# test3_bad1.tar: byte at offset 259 changed from 't' to '0' (magic)
# test3_bad2.tar: byte at offset 1283 changed from 't' to '0' (magic)
# test3_bad3.tar: byte at offset 2559 changed from 0x00 to 0x20 (padding)
@ -60,137 +76,191 @@ test_failed() { fail=1 ; printf " $1" ; [ -z "$2" ] || printf "($2)" ; }
# test3_bad5.tar: 510 zeros + "LZ" prepended to test3.tar (bogus lz header)
# test3_bad1.tar.lz: byte at offset 2 changed from 'I' to 'i' (magic)
# test3_bad2.tar.lz: byte at offset 49 changed from 0x49 to 0x69 (mid stream)
# test3_bad3.tar.lz: byte at offset 149 changed from 0x2D to 0x3D (mid stream)
# test3_bad3.tar.lz: byte at offset 176 changed from 0x7D to 0x6D (mid stream)
# test3_bad4.tar.lz: combined damage of test3_bad2.tar.lz and test3_bad3.tar.lz
# test3_bad5.tar.lz: [71-134] --> zeroed (first trailer + seconf header)
# test3_bad6.tar.lz: 510 zeros prepended to test3.tar.lz (header in two blocks)
# tlz_in_tar1.tar: 1 member (test3.tar.lz) first magic damaged
# tlz_in_tar2.tar: 2 members (foo test3.tar.lz) first magic damaged
# ug32chars.tar.lz: 1 member (foo) with 32-character owner and group names
printf "testing tarlz-%s..." "$2"
"${TARLZ}" -qtf ${in}
"${TARLZ}" -q -tf "${in}"
[ $? = 2 ] || test_failed $LINENO
"${TARLZ}" -qtf ${in_lz}
"${TARLZ}" -q -tf "${in_lz}"
[ $? = 2 ] || test_failed $LINENO
"${TARLZ}" -qtf nx_file
"${TARLZ}" -q -tf nx_file
[ $? = 1 ] || test_failed $LINENO
"${TARLZ}" -tf 2> /dev/null
[ $? = 1 ] || test_failed $LINENO
"${TARLZ}" -qcf out.tar.lz
"${TARLZ}" -q -cf out.tar.lz
[ $? = 1 ] || test_failed $LINENO
[ ! -e out.tar.lz ] || test_failed $LINENO
"${TARLZ}" -rf out.tar.lz || test_failed $LINENO
[ ! -e out.tar.lz ] || test_failed $LINENO
"${TARLZ}" -qrf - ${in}
"${TARLZ}" -q -rf - "${in}"
[ $? = 1 ] || test_failed $LINENO
[ ! -e - ] || test_failed $LINENO
"${TARLZ}" -qr ${in}
"${TARLZ}" -q -r "${in}"
[ $? = 1 ] || test_failed $LINENO
"${TARLZ}" --uncompressed -qrf out.tar ${in}
"${TARLZ}" --uncompressed -q -rf out.tar "${in}"
[ $? = 1 ] || test_failed $LINENO
[ ! -e out.tar ] || test_failed $LINENO
cat ${test3_lz} > test.tar.lz || framework_failure
"${TARLZ}" --uncompressed -qrf test.tar.lz ${in}
cat "${test3_lz}" > test.tar.lz || framework_failure
"${TARLZ}" --uncompressed -q -rf test.tar.lz "${in}"
[ $? = 1 ] || test_failed $LINENO
cmp ${test3_lz} test.tar.lz || test_failed $LINENO
cmp "${test3_lz}" test.tar.lz || test_failed $LINENO
rm -f test.tar.lz || framework_failure
cat ${test3} > test.tar || framework_failure
"${TARLZ}" -qrf test.tar ${in}
cat "${test3}" > test.tar || framework_failure
"${TARLZ}" -q -rf test.tar "${in}"
[ $? = 2 ] || test_failed $LINENO
cmp ${test3} test.tar || test_failed $LINENO
cmp "${test3}" test.tar || test_failed $LINENO
rm -f test.tar || framework_failure
"${TARLZ}" -qc ${in} nx_file > /dev/null
"${TARLZ}" -q -c "${in}" nx_file > /dev/null
[ $? = 1 ] || test_failed $LINENO
"${TARLZ}" -qc -C nx_dir ${in}
"${TARLZ}" -q -c -C nx_dir "${in}"
[ $? = 1 ] || test_failed $LINENO
"${TARLZ}" -qx -C nx_dir ${test3_lz}
"${TARLZ}" -q -x -C nx_dir "${test3_lz}"
[ $? = 1 ] || test_failed $LINENO
"${TARLZ}" -qcr
"${TARLZ}" -q -cr
[ $? = 1 ] || test_failed $LINENO
"${TARLZ}" -qct
"${TARLZ}" -q -ct
[ $? = 1 ] || test_failed $LINENO
"${TARLZ}" -qcx
"${TARLZ}" -q -cx
[ $? = 1 ] || test_failed $LINENO
"${TARLZ}" -qtx
"${TARLZ}" -q -tx
[ $? = 1 ] || test_failed $LINENO
"${TARLZ}" -qctx
"${TARLZ}" -q -ctx
[ $? = 1 ] || test_failed $LINENO
"${TARLZ}" --help > /dev/null || test_failed $LINENO
"${TARLZ}" -V > /dev/null || test_failed $LINENO
"${TARLZ}" --bad_option -tf ${test3_lz} 2> /dev/null
"${TARLZ}" --bad_option -tf "${test3_lz}" 2> /dev/null
[ $? = 1 ] || test_failed $LINENO
"${TARLZ}" -tf 2> /dev/null
[ $? = 1 ] || test_failed $LINENO
"${TARLZ}" --owner=invalid_oner_name -tf ${test3_lz} 2> /dev/null
"${TARLZ}" --owner=invalid_oner_name -tf "${test3_lz}" 2> /dev/null
[ $? = 1 ] || test_failed $LINENO
"${TARLZ}" --group=invalid_goup_name -tf ${test3_lz} 2> /dev/null
"${TARLZ}" --group=invalid_goup_name -tf "${test3_lz}" 2> /dev/null
[ $? = 1 ] || test_failed $LINENO
"${TARLZ}" -tf ${eof_lz} || test_failed $LINENO
"${TARLZ}" -xf ${eof_lz} || test_failed $LINENO
"${TARLZ}" -tf ${in_tar_lz} > /dev/null || test_failed $LINENO
"${TARLZ}" -xf ${in_tar_lz} || test_failed $LINENO
cmp ${in} test.txt || test_failed $LINENO
# test --list and --extract
"${TARLZ}" -tf "${eof_lz}" --missing-crc || test_failed $LINENO
"${TARLZ}" -xf "${eof_lz}" --missing-crc || test_failed $LINENO
"${TARLZ}" -tf "${in_tar_lz}" --missing-crc > /dev/null || test_failed $LINENO
"${TARLZ}" -xf "${in_tar_lz}" --missing-crc || test_failed $LINENO
cmp "${in}" test.txt || test_failed $LINENO
rm -f test.txt || framework_failure
"${TARLZ}" -C nx_dir -tf ${in_tar} > /dev/null || test_failed $LINENO
"${TARLZ}" -xf ${in_tar} || test_failed $LINENO
cmp ${in} test.txt || test_failed $LINENO
"${TARLZ}" -C nx_dir -tf "${in_tar}" > /dev/null || test_failed $LINENO
"${TARLZ}" -xf "${in_tar}" --missing-crc || test_failed $LINENO
cmp "${in}" test.txt || test_failed $LINENO
rm -f test.txt || framework_failure
printf "foo\n" > cfoo || framework_failure
printf "bar\n" > cbar || framework_failure
printf "baz\n" > cbaz || framework_failure
rm -f foo bar baz || framework_failure
"${TARLZ}" -xf ${test3_lz} || test_failed $LINENO
[ -e foo ] || test_failed $LINENO
[ -e bar ] || test_failed $LINENO
[ -e baz ] || test_failed $LINENO
"${TARLZ}" -xf "${test3_lz}" --missing-crc || test_failed $LINENO
cmp cfoo foo || test_failed $LINENO
cmp cbar bar || test_failed $LINENO
cmp cbaz baz || test_failed $LINENO
rm -f foo bar baz || framework_failure
"${TARLZ}" -xf ${test3} || test_failed $LINENO
[ -e foo ] || test_failed $LINENO
[ -e bar ] || test_failed $LINENO
[ -e baz ] || test_failed $LINENO
"${TARLZ}" -q -xf "${test3_lz}" ./foo ./bar ./baz || test_failed $LINENO
cmp cfoo foo || test_failed $LINENO
cmp cbar bar || test_failed $LINENO
cmp cbaz baz || test_failed $LINENO
rm -f foo bar baz || framework_failure
"${TARLZ}" -qxf ${test3a_lz} || test_failed $LINENO
[ -e dir/foo ] || test_failed $LINENO
[ -e dir/bar ] || test_failed $LINENO
[ -e dir/baz ] || test_failed $LINENO
"${TARLZ}" -xf "${test3}" --missing-crc || test_failed $LINENO
cmp cfoo foo || test_failed $LINENO
cmp cbar bar || test_failed $LINENO
cmp cbaz baz || test_failed $LINENO
rm -f foo bar baz || framework_failure
"${TARLZ}" -q -xf "${test3dot_lz}" --missing-crc || test_failed $LINENO
cmp cfoo foo || test_failed $LINENO
cmp cbar bar || test_failed $LINENO
cmp cbaz baz || test_failed $LINENO
rm -f foo bar baz || framework_failure
"${TARLZ}" -q -xf "${test3dot_lz}" foo bar baz || test_failed $LINENO
cmp cfoo foo || test_failed $LINENO
cmp cbar bar || test_failed $LINENO
cmp cbaz baz || test_failed $LINENO
rm -f foo bar baz || framework_failure
"${TARLZ}" -q -xf "${test3dir_lz}" --missing-crc || test_failed $LINENO
cmp cfoo dir/foo || test_failed $LINENO
cmp cbar dir/bar || test_failed $LINENO
cmp cbaz dir/baz || test_failed $LINENO
rm -rf dir || framework_failure
"${TARLZ}" -q -xf "${test3dir_lz}" dir/foo dir/bar dir/baz || test_failed $LINENO
cmp cfoo dir/foo || test_failed $LINENO
cmp cbar dir/bar || test_failed $LINENO
cmp cbaz dir/baz || test_failed $LINENO
rm -rf dir || framework_failure
cat ${in} > test.txt || framework_failure
# test --concatenate
cat "${in_tar_lz}" > out.tar.lz || framework_failure
"${TARLZ}" -Af out.tar.lz "${test3_lz}" || test_failed $LINENO
"${TARLZ}" -xf out.tar.lz || test_failed $LINENO
cmp "${in}" test.txt || test_failed $LINENO
cmp cfoo foo || test_failed $LINENO
cmp cbar bar || test_failed $LINENO
cmp cbaz baz || test_failed $LINENO
touch aout.tar.lz || framework_failure # concatenate to empty file
"${TARLZ}" -Af aout.tar.lz "${in_tar_lz}" "${test3_lz}" || test_failed $LINENO
cmp out.tar.lz aout.tar.lz || test_failed $LINENO
cat "${in_tar_lz}" > aout.tar.lz || framework_failure
"${TARLZ}" -Aqf aout.tar.lz "${test3_lz}" "${test3}"
[ $? = 2 ] || test_failed $LINENO
cmp out.tar.lz aout.tar.lz || test_failed $LINENO
rm -f test.txt foo bar baz out.tar.lz aout.tar.lz || framework_failure
# test --create
cat "${in}" > test.txt || framework_failure
"${TARLZ}" -0 -cf out.tar.lz test.txt || test_failed $LINENO
rm -f test.txt || framework_failure
"${TARLZ}" -xf out.tar.lz || test_failed $LINENO
cmp ${in} test.txt || test_failed $LINENO
cat ${in} > test.txt || framework_failure
"${TARLZ}" -xf out.tar.lz --missing-crc || test_failed $LINENO
cmp "${in}" test.txt || test_failed $LINENO
cat "${in}" > test.txt || framework_failure
"${TARLZ}" --uncompressed -cf out.tar test.txt || test_failed $LINENO
rm -f test.txt || framework_failure
"${TARLZ}" -xf out.tar || test_failed $LINENO
cmp ${in} test.txt || test_failed $LINENO
"${TARLZ}" -xf out.tar --missing-crc || test_failed $LINENO
cmp "${in}" test.txt || test_failed $LINENO
rm -f test.txt out.tar out.tar.lz || framework_failure
printf "foo" > foo || framework_failure
cat cfoo > foo || framework_failure
rm -f bar || framework_failure
printf "baz" > baz || framework_failure
"${TARLZ}" -qcf out.tar.lz foo bar baz
cat cbaz > baz || framework_failure
"${TARLZ}" -q -cf out.tar.lz foo bar baz
[ $? = 1 ] || test_failed $LINENO
rm -f foo bar baz || framework_failure
"${TARLZ}" -xf out.tar.lz || test_failed $LINENO
[ -e foo ] || test_failed $LINENO
"${TARLZ}" -xf out.tar.lz --missing-crc || test_failed $LINENO
cmp cfoo foo || test_failed $LINENO
[ ! -e bar ] || test_failed $LINENO
[ -e baz ] || test_failed $LINENO
cmp cbaz baz || test_failed $LINENO
rm -f foo bar baz || framework_failure
"${TARLZ}" -qxf out.tar.lz bar
"${TARLZ}" -q -xf out.tar.lz bar
[ $? = 1 ] || test_failed $LINENO
[ ! -e foo ] || test_failed $LINENO
[ ! -e bar ] || test_failed $LINENO
[ ! -e baz ] || test_failed $LINENO
rm -f out.tar.lz || framework_failure
printf "foo" > foo || framework_failure
printf "bar" > bar || framework_failure
printf "baz" > baz || framework_failure
cat cfoo > foo || framework_failure
cat cbar > bar || framework_failure
cat cbaz > baz || framework_failure
"${TARLZ}" -0 -cf out.tar.lz foo bar baz || test_failed $LINENO
"${TARLZ}" -0 -q -cf aout.tar.lz foo bar aout.tar.lz baz || test_failed $LINENO
cmp out.tar.lz aout.tar.lz || test_failed $LINENO
"${TARLZ}" -q -Af aout.tar.lz aout.tar.lz || test_failed $LINENO
cmp out.tar.lz aout.tar.lz || test_failed $LINENO
"${TARLZ}" -q -rf aout.tar.lz aout.tar.lz || test_failed $LINENO
cmp out.tar.lz aout.tar.lz || test_failed $LINENO
rm -f aout.tar.lz || framework_failure
# test --append
"${TARLZ}" --dsolid -0 -cf aout.tar.lz foo bar baz || test_failed $LINENO
cmp out.tar.lz aout.tar.lz || test_failed $LINENO
rm -f aout.tar.lz || framework_failure
"${TARLZ}" -0 -qcf aout.tar.lz foo/ ./bar ./baz/ || test_failed $LINENO
"${TARLZ}" -0 -q -cf aout.tar.lz foo/ ./bar ./baz/ || test_failed $LINENO
cmp out.tar.lz aout.tar.lz || test_failed $LINENO
rm -f aout.tar.lz || framework_failure
"${TARLZ}" -0 -cf aout.tar.lz foo || test_failed $LINENO
@ -204,51 +274,49 @@ cmp out.tar.lz aout.tar.lz || test_failed $LINENO
cmp out.tar.lz aout.tar.lz || test_failed $LINENO
"${TARLZ}" -0 -rf aout.tar.lz -C nx_dir || test_failed $LINENO
cmp out.tar.lz aout.tar.lz || test_failed $LINENO
"${TARLZ}" -0 -qrf aout.tar.lz nx_file
"${TARLZ}" -0 -q -rf aout.tar.lz nx_file
[ $? = 1 ] || test_failed $LINENO
cmp out.tar.lz aout.tar.lz || test_failed $LINENO
cat ${eof_lz} > aout.tar.lz || framework_failure # append to empty archive
cat "${eof_lz}" > aout.tar.lz || framework_failure # append to empty archive
"${TARLZ}" -0 -rf aout.tar.lz foo bar baz || test_failed $LINENO
cmp out.tar.lz aout.tar.lz || test_failed $LINENO
mv -f foo foo.orig || framework_failure
mv -f bar bar.orig || framework_failure
mv -f baz baz.orig || framework_failure
rm -f foo bar baz || framework_failure
"${TARLZ}" -xf out.tar.lz foo/ bar// baz/// || test_failed $LINENO
cmp foo foo.orig || test_failed $LINENO
cmp bar bar.orig || test_failed $LINENO
cmp baz baz.orig || test_failed $LINENO
cmp cfoo foo || test_failed $LINENO
cmp cbar bar || test_failed $LINENO
cmp cbaz baz || test_failed $LINENO
rm -f foo bar baz || framework_failure
"${TARLZ}" -xf out.tar.lz || test_failed $LINENO
cmp foo foo.orig || test_failed $LINENO
cmp bar bar.orig || test_failed $LINENO
cmp baz baz.orig || test_failed $LINENO
cmp cfoo foo || test_failed $LINENO
cmp cbar bar || test_failed $LINENO
cmp cbaz baz || test_failed $LINENO
mkdir dir1 || framework_failure
"${TARLZ}" -C dir1 -xf out.tar.lz || test_failed $LINENO
cmp dir1/foo foo.orig || test_failed $LINENO
cmp dir1/bar bar.orig || test_failed $LINENO
cmp dir1/baz baz.orig || test_failed $LINENO
cmp cfoo dir1/foo || test_failed $LINENO
cmp cbar dir1/bar || test_failed $LINENO
cmp cbaz dir1/baz || test_failed $LINENO
rm -f aout.tar.lz foo bar baz || framework_failure
"${TARLZ}" -C dir1 -0 -cf aout.tar.lz foo bar baz || test_failed $LINENO
"${TARLZ}" -xf aout.tar.lz || test_failed $LINENO
cmp foo foo.orig || test_failed $LINENO
cmp bar bar.orig || test_failed $LINENO
cmp baz baz.orig || test_failed $LINENO
cmp cfoo foo || test_failed $LINENO
cmp cbar bar || test_failed $LINENO
cmp cbaz baz || test_failed $LINENO
rm -f aout.tar.lz foo bar baz || framework_failure
"${TARLZ}" -C dir1 -0 -c foo bar baz | "${TARLZ}" -x || test_failed $LINENO
cmp foo foo.orig || test_failed $LINENO
cmp bar bar.orig || test_failed $LINENO
cmp baz baz.orig || test_failed $LINENO
cmp cfoo foo || test_failed $LINENO
cmp cbar bar || test_failed $LINENO
cmp cbaz baz || test_failed $LINENO
rm -f dir1/foo dir1/bar dir1/baz || framework_failure
"${TARLZ}" -0 -c foo bar baz | "${TARLZ}" -C dir1 -x || test_failed $LINENO
cmp dir1/foo foo.orig || test_failed $LINENO
cmp dir1/bar bar.orig || test_failed $LINENO
cmp dir1/baz baz.orig || test_failed $LINENO
cmp cfoo dir1/foo || test_failed $LINENO
cmp cbar dir1/bar || test_failed $LINENO
cmp cbaz dir1/baz || test_failed $LINENO
rm -f dir1/foo dir1/bar dir1/baz || framework_failure
"${TARLZ}" -0 -c foo bar baz | "${TARLZ}" -x foo bar baz -C dir1 ||
test_failed $LINENO
cmp dir1/foo foo.orig || test_failed $LINENO
cmp dir1/bar bar.orig || test_failed $LINENO
cmp dir1/baz baz.orig || test_failed $LINENO
cmp cfoo dir1/foo || test_failed $LINENO
cmp cbar dir1/bar || test_failed $LINENO
cmp cbaz dir1/baz || test_failed $LINENO
rm -f foo dir1/bar baz || framework_failure
"${TARLZ}" -0 -cf aout.tar.lz -C dir1 foo -C .. bar -C dir1 baz ||
test_failed $LINENO
@ -256,22 +324,23 @@ cmp out.tar.lz aout.tar.lz || test_failed $LINENO
"${TARLZ}" -0 -cf aout.tar.lz dir1/foo dir1/baz || test_failed $LINENO
rm -rf dir1 || framework_failure
"${TARLZ}" -xf aout.tar.lz dir1 || test_failed $LINENO
cmp dir1/foo foo.orig || test_failed $LINENO
cmp dir1/baz baz.orig || test_failed $LINENO
cmp cfoo dir1/foo || test_failed $LINENO
cmp cbaz dir1/baz || test_failed $LINENO
rm -rf dir1 || framework_failure
rm -f out.tar.lz aout.tar.lz || framework_failure
# append to solid archive
printf "foo" > foo || framework_failure
printf "bar" > bar || framework_failure
printf "baz" > baz || framework_failure
cat cfoo > foo || framework_failure
cat cbar > bar || framework_failure
cat cbaz > baz || framework_failure
"${TARLZ}" --solid -0 -cf out.tar.lz foo || test_failed $LINENO
cat out.tar.lz > aout.tar.lz || framework_failure
for i in --asolid --dsolid --solid -0 ; do
"${TARLZ}" $i -qrf out.tar.lz bar baz
"${TARLZ}" $i -q -rf out.tar.lz bar baz
[ $? = 2 ] || test_failed $LINENO $i
[ -e out.tar.lz ] || test_failed $LINENO $i
cmp out.tar.lz aout.tar.lz || test_failed $LINENO $i
done
rm -f out.tar.lz || framework_failure
rm -f out.tar.lz aout.tar.lz || framework_failure
for i in --asolid --dsolid -0 ; do
for j in --asolid --dsolid --solid -0 ; do
"${TARLZ}" $i -0 -cf out.tar.lz foo ||
@ -280,14 +349,15 @@ for i in --asolid --dsolid -0 ; do
test_failed $LINENO "$i $j"
rm -f foo bar baz || framework_failure
"${TARLZ}" -xf out.tar.lz || test_failed $LINENO "$i $j"
cmp foo foo.orig || test_failed $LINENO "$i $j"
cmp bar bar.orig || test_failed $LINENO "$i $j"
cmp baz baz.orig || test_failed $LINENO "$i $j"
cmp cfoo foo || test_failed $LINENO "$i $j"
cmp cbar bar || test_failed $LINENO "$i $j"
cmp cbaz baz || test_failed $LINENO "$i $j"
rm -f out.tar.lz || framework_failure
done
done
rm -f foo foo.orig bar bar.orig baz baz.orig || framework_failure
rm -f foo bar baz || framework_failure
# test directories and links
mkdir dir1 || framework_failure
"${TARLZ}" -0 -cf out.tar dir1 || test_failed $LINENO
rmdir dir1 || framework_failure
@ -302,131 +372,222 @@ rmdir dir1 || framework_failure
rmdir dir1
rm -f out.tar || framework_failure
if ln ${in} dummy_link 2> /dev/null &&
ln -s ${in} dummy_slink 2> /dev/null ; then
touch dummy_file || framework_failure
if ln dummy_file dummy_link 2> /dev/null &&
ln -s dummy_file dummy_slink 2> /dev/null ; then
ln_works=yes
name_100=name_100_bytes_long_nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn
path_100=dir1/dir2/dir3/path_100_bytes_long_nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn
path_106=dir1/dir2/dir3/path_longer_than_100_bytes_nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn
mkdir dir1 || framework_failure
mkdir dir1/dir2 || framework_failure
mkdir dir1/dir2/dir3 || framework_failure
cat ${in} > dir1/dir2/dir3/in || framework_failure
ln dir1/dir2/dir3/in dir1/dir2/dir3/${name_100} || framework_failure
ln dir1/dir2/dir3/in ${path_100} || framework_failure
ln dir1/dir2/dir3/in ${path_106} || framework_failure
cat "${in}" > dir1/dir2/dir3/in || framework_failure
ln dir1/dir2/dir3/in dir1/dir2/dir3/"${name_100}" || framework_failure
ln dir1/dir2/dir3/in "${path_100}" || framework_failure
ln dir1/dir2/dir3/in "${path_106}" || framework_failure
ln -s in dir1/dir2/dir3/link || framework_failure
ln -s ${name_100} dir1/dir2/dir3/link_100 || framework_failure
ln -s "${name_100}" dir1/dir2/dir3/link_100 || framework_failure
"${TARLZ}" -0 -cf out.tar dir1 || test_failed $LINENO
rm -rf dir1 || framework_failure
"${TARLZ}" -xf out.tar || test_failed $LINENO
cmp ${in} dir1/dir2/dir3/in || test_failed $LINENO
cmp ${in} dir1/dir2/dir3/${name_100} || test_failed $LINENO
cmp ${in} ${path_100} || test_failed $LINENO
cmp ${in} ${path_106} || test_failed $LINENO
cmp ${in} dir1/dir2/dir3/link || test_failed $LINENO
cmp ${in} dir1/dir2/dir3/link_100 || test_failed $LINENO
cmp "${in}" dir1/dir2/dir3/in || test_failed $LINENO
cmp "${in}" dir1/dir2/dir3/"${name_100}" || test_failed $LINENO
cmp "${in}" "${path_100}" || test_failed $LINENO
cmp "${in}" "${path_106}" || test_failed $LINENO
cmp "${in}" dir1/dir2/dir3/link || test_failed $LINENO
cmp "${in}" dir1/dir2/dir3/link_100 || test_failed $LINENO
rm -f dir1/dir2/dir3/in || framework_failure
cmp ${in} dir1/dir2/dir3/link 2> /dev/null && test_failed $LINENO
cmp ${in} dir1/dir2/dir3/link_100 || test_failed $LINENO
cmp "${in}" dir1/dir2/dir3/link 2> /dev/null && test_failed $LINENO
cmp "${in}" dir1/dir2/dir3/link_100 || test_failed $LINENO
"${TARLZ}" -xf out.tar || test_failed $LINENO
rm -f out.tar || framework_failure
cmp ${in} dir1/dir2/dir3/in || test_failed $LINENO
cmp ${in} dir1/dir2/dir3/link || test_failed $LINENO
"${TARLZ}" -0 -qc ../tmp/dir1 > /dev/null || test_failed $LINENO
cmp "${in}" dir1/dir2/dir3/in || test_failed $LINENO
cmp "${in}" dir1/dir2/dir3/link || test_failed $LINENO
"${TARLZ}" -0 -q -c ../tmp/dir1 > /dev/null || test_failed $LINENO
rm -rf dir1 || framework_failure
else
printf "\nwarning: skipping link test: 'ln' does not work on your system."
fi
rm -f dummy_link dummy_slink || framework_failure
rm -f dummy_slink dummy_link dummy_file || framework_failure
"${TARLZ}" -qxf "${testdir}"/dotdot1.tar.lz || test_failed $LINENO
[ ! -e ../dir ] || test_failed $LINENO
"${TARLZ}" -qxf "${testdir}"/dotdot2.tar.lz || test_failed $LINENO
[ ! -e ../dir ] || test_failed $LINENO
"${TARLZ}" -qxf "${testdir}"/dotdot3.tar.lz || test_failed $LINENO
[ ! -e dir ] || test_failed $LINENO
"${TARLZ}" -qxf "${testdir}"/dotdot4.tar.lz || test_failed $LINENO
[ ! -e dir ] || test_failed $LINENO
"${TARLZ}" -qxf "${testdir}"/dotdot5.tar.lz || test_failed $LINENO
[ ! -e dir ] || test_failed $LINENO
printf "\ntesting long names..."
"${TARLZ}" -q -tf "${t155}" || test_failed $LINENO
"${TARLZ}" -q -tf "${t155_lz}" || test_failed $LINENO
if [ "${ln_works}" = yes ] ; then
mkdir dir1 || framework_failure
"${TARLZ}" -C dir1 -xf "${t155}" || test_failed $LINENO
mkdir dir2 || framework_failure
"${TARLZ}" -C dir2 -xf "${t155_lz}" || test_failed $LINENO
diff -r dir1 dir2 || test_failed $LINENO
rmdir dir2 2> /dev/null && test_failed $LINENO
rmdir dir1 2> /dev/null && test_failed $LINENO
rm -rf dir2 dir1 || framework_failure
fi
"${TARLZ}" -tvf "${testdir}"/ug32chars.tar.lz | grep -q \
-e very_long_owner_name_of_32_chars/very_long_group_name_of_32_chars ||
test_failed $LINENO
"${TARLZ}" -tvf "${testdir}"/ug32chars.tar.lz | grep -q \
-e very_long_owner_name_of_32_charsvery_long_group_name_of_32_chars &&
test_failed $LINENO
"${TARLZ}" -tvf "${testdir}"/ug32chars.tar.lz | grep -q \
-e very_long_group_name_of_32_chars/very_long_group_name_of_32_chars &&
test_failed $LINENO
"${TARLZ}" -xf "${testdir}"/ug32chars.tar.lz || test_failed $LINENO
cmp cfoo foo || test_failed $LINENO
rm -f foo || framework_failure
printf "\ntesting bad input..."
dd if=${in_tar} of=truncated.tar bs=1000 count=1 2> /dev/null
"${TARLZ}" -qtf truncated.tar > /dev/null
"${TARLZ}" -q -xf "${testdir}"/dotdot1.tar.lz || test_failed $LINENO
[ ! -e ../dir ] || test_failed $LINENO
"${TARLZ}" -q -xf "${testdir}"/dotdot2.tar.lz || test_failed $LINENO
[ ! -e ../dir ] || test_failed $LINENO
"${TARLZ}" -q -xf "${testdir}"/dotdot3.tar.lz || test_failed $LINENO
[ ! -e dir ] || test_failed $LINENO
"${TARLZ}" -q -xf "${testdir}"/dotdot4.tar.lz || test_failed $LINENO
[ ! -e dir ] || test_failed $LINENO
"${TARLZ}" -q -xf "${testdir}"/dotdot5.tar.lz || test_failed $LINENO
[ ! -e dir ] || test_failed $LINENO
dd if="${in_tar}" of=truncated.tar bs=1000 count=1 2> /dev/null
"${TARLZ}" -q -tf truncated.tar > /dev/null
[ $? = 2 ] || test_failed $LINENO
"${TARLZ}" -qxf truncated.tar
"${TARLZ}" -q -xf truncated.tar
[ $? = 2 ] || test_failed $LINENO
[ ! -e test.txt ] || test_failed $LINENO
rm -f truncated.tar || framework_failure
# test compressed and --keep-damaged
rm -f test.txt || framework_failure
for i in "${inbad1}" "${inbad2}" ; do
"${TARLZ}" -q -xf "${i}.tar.lz"
[ $? = 2 ] || test_failed $LINENO "${i}"
[ ! -e test.txt ] || test_failed $LINENO "${i}"
rm -f test.txt || framework_failure
"${TARLZ}" -q -xf "${i}.tar.lz" --keep-damaged
[ $? = 2 ] || test_failed $LINENO "${i}"
[ -e test.txt ] || test_failed $LINENO "${i}"
cmp "${i}" test.txt 2> /dev/null || lzlib_1_11 "$LINENO ${i}"
rm -f test.txt || framework_failure
done
#
rm -f foo bar baz || framework_failure
"${TARLZ}" -qxf ${bad1_lz}
"${TARLZ}" -q -xf "${bad1_lz}"
[ $? = 2 ] || test_failed $LINENO
[ ! -e foo ] || test_failed $LINENO
[ -e bar ] || test_failed $LINENO
[ -e baz ] || test_failed $LINENO
cmp cbar bar || test_failed $LINENO
cmp cbaz baz || test_failed $LINENO
rm -f foo bar baz || framework_failure
"${TARLZ}" -qxf ${bad2_lz}
"${TARLZ}" -q -xf "${bad2_lz}"
[ $? = 2 ] || test_failed $LINENO
[ ! -e foo ] || test_failed $LINENO
[ -e bar ] || test_failed $LINENO
[ -e baz ] || test_failed $LINENO
cmp cbar bar || test_failed $LINENO
cmp cbaz baz || test_failed $LINENO
rm -f foo bar baz || framework_failure
"${TARLZ}" -qxf ${bad3_lz}
"${TARLZ}" -q -xf "${bad3_lz}"
[ $? = 2 ] || test_failed $LINENO
[ -e foo ] || test_failed $LINENO
cmp cfoo foo || test_failed $LINENO
[ ! -e bar ] || test_failed $LINENO
[ -e baz ] || test_failed $LINENO
cmp cbaz baz || test_failed $LINENO
rm -f foo bar baz || framework_failure
"${TARLZ}" -qxf ${bad4_lz}
"${TARLZ}" -q -xf "${bad3_lz}" --keep-damaged
[ $? = 2 ] || test_failed $LINENO
cmp cfoo foo || test_failed $LINENO
cmp cbar bar 2> /dev/null || lzlib_1_11 $LINENO
cmp cbaz baz || test_failed $LINENO
rm -f foo bar baz || framework_failure
"${TARLZ}" -q -xf "${bad4_lz}"
[ $? = 2 ] || test_failed $LINENO
[ ! -e foo ] || test_failed $LINENO
[ ! -e bar ] || test_failed $LINENO
[ -e baz ] || test_failed $LINENO
cmp cbaz baz || test_failed $LINENO
rm -f foo bar baz || framework_failure
"${TARLZ}" -qxf ${bad5_lz}
"${TARLZ}" -q -xf "${bad4_lz}" --keep-damaged
[ $? = 2 ] || test_failed $LINENO
[ ! -e foo ] || test_failed $LINENO
cmp cbar bar 2> /dev/null || lzlib_1_11 $LINENO
cmp cbaz baz || test_failed $LINENO
rm -f foo bar baz || framework_failure
"${TARLZ}" -q -xf "${bad5_lz}"
[ $? = 2 ] || test_failed $LINENO
[ ! -e foo ] || test_failed $LINENO
[ ! -e bar ] || test_failed $LINENO
[ -e baz ] || test_failed $LINENO
cmp cbaz baz || test_failed $LINENO
rm -f foo bar baz || framework_failure
"${TARLZ}" -qxf ${bad6_lz}
"${TARLZ}" -q -xf "${bad5_lz}" --keep-damaged
[ $? = 2 ] || test_failed $LINENO
[ -e foo ] || test_failed $LINENO
[ -e bar ] || test_failed $LINENO
[ -e baz ] || test_failed $LINENO
cmp cfoo foo 2> /dev/null || lzlib_1_11 $LINENO
[ ! -e bar ] || test_failed $LINENO
cmp cbaz baz || test_failed $LINENO
rm -f foo bar baz || framework_failure
"${TARLZ}" -q -xf "${bad6_lz}"
[ $? = 2 ] || test_failed $LINENO
cmp cfoo foo || test_failed $LINENO
cmp cbar bar || test_failed $LINENO
cmp cbaz baz || test_failed $LINENO
# test uncompressed and --keep-damaged
rm -f test.txt || framework_failure
"${TARLZ}" -q -xf "${inbad1}.tar"
[ $? = 2 ] || test_failed $LINENO
[ ! -e test.txt ] || test_failed $LINENO
rm -f test.txt || framework_failure
"${TARLZ}" -q -xf "${inbad1}.tar" --keep-damaged
[ $? = 2 ] || test_failed $LINENO
[ -e test.txt ] || test_failed $LINENO
cmp "${inbad1}" test.txt 2> /dev/null || test_failed $LINENO
rm -f test.txt || framework_failure
#
rm -f foo bar baz || framework_failure
"${TARLZ}" -qxf ${bad1}
"${TARLZ}" -q -xf "${bad1}"
[ $? = 2 ] || test_failed $LINENO
[ ! -e foo ] || test_failed $LINENO
[ -e bar ] || test_failed $LINENO
[ -e baz ] || test_failed $LINENO
cmp cbar bar || test_failed $LINENO
cmp cbaz baz || test_failed $LINENO
rm -f foo bar baz || framework_failure
"${TARLZ}" -qxf ${bad2}
"${TARLZ}" -q -xf "${bad2}"
[ $? = 2 ] || test_failed $LINENO
[ -e foo ] || test_failed $LINENO
cmp cfoo foo || test_failed $LINENO
[ ! -e bar ] || test_failed $LINENO
[ -e baz ] || test_failed $LINENO
cmp cbaz baz || test_failed $LINENO
rm -f foo bar baz || framework_failure
"${TARLZ}" -qxf ${bad3}
"${TARLZ}" -q -xf "${bad3}"
[ $? = 2 ] || test_failed $LINENO
[ -e foo ] || test_failed $LINENO
[ -e bar ] || test_failed $LINENO
cmp cfoo foo || test_failed $LINENO
cmp cbar bar || test_failed $LINENO
[ ! -e baz ] || test_failed $LINENO
rm -f foo bar baz || framework_failure
"${TARLZ}" -qxf ${bad4}
"${TARLZ}" -q -xf "${bad4}"
[ $? = 2 ] || test_failed $LINENO
[ -e foo ] || test_failed $LINENO
cmp cfoo foo || test_failed $LINENO
[ ! -e bar ] || test_failed $LINENO
[ ! -e baz ] || test_failed $LINENO
rm -f foo bar baz || framework_failure
"${TARLZ}" -qxf ${bad5}
"${TARLZ}" -q -xf "${bad5}"
[ $? = 2 ] || test_failed $LINENO
[ -e foo ] || test_failed $LINENO
[ -e bar ] || test_failed $LINENO
[ -e baz ] || test_failed $LINENO
rm -f foo bar baz || framework_failure
cmp cfoo foo || test_failed $LINENO
cmp cbar bar || test_failed $LINENO
cmp cbaz baz || test_failed $LINENO
rm -f cfoo cbar cbaz foo bar baz || framework_failure
#
rm -f test3.tar.lz || framework_failure
"${TARLZ}" -q -xf "${tlzit1}"
[ $? = 2 ] || test_failed $LINENO
[ ! -e foo ] || test_failed $LINENO
[ ! -e bar ] || test_failed $LINENO
[ ! -e baz ] || test_failed $LINENO
[ ! -e test3.tar.lz ] || test_failed $LINENO
rm -f foo bar baz test3.tar.lz || framework_failure
"${TARLZ}" -q -xf "${tlzit2}"
[ $? = 2 ] || test_failed $LINENO
[ ! -e foo ] || test_failed $LINENO
[ ! -e bar ] || test_failed $LINENO
[ ! -e baz ] || test_failed $LINENO
cmp "${test3_lz}" test3.tar.lz || test_failed $LINENO
rm -f foo bar baz test3.tar.lz || framework_failure
echo
if [ ${fail} = 0 ] ; then

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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
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.
To protect your rights, we need to make restrictions that forbid
anyone to deny you these rights or to ask you to surrender the rights.
These restrictions translate to certain responsibilities for you if you
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.
We protect your rights with two steps: (1) copyright the software, and
(2) offer you this license which gives you legal permission to copy,
distribute and/or modify the software.
Also, for each author's protection and ours, we want to make certain
that everyone understands that there is no warranty for this free
software. If the software is modified by someone else and passed on, we
want its recipients to know that what they have is not the original, so
that any problems introduced by others will not reflect on the original
authors' reputations.
Finally, any free program is threatened constantly by software
patents. We wish to avoid the danger that redistributors of a free
program will individually obtain patent licenses, in effect making the
program proprietary. To prevent this, we have made it clear that any
patent must be licensed for everyone's free use or not licensed at all.
The precise terms and conditions for copying, distribution and
modification follow.
GNU GENERAL PUBLIC LICENSE
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
0. This License applies to any program or other work which contains
a notice placed by the copyright holder saying it may be distributed
under the terms of this General Public License. The "Program", below,
refers to any such program or work, and a "work based on the Program"
means either the Program or any derivative work under copyright law:
that is to say, a work containing the Program or a portion of it,
either verbatim or with modifications and/or translated into another
language. (Hereinafter, translation is included without limitation in
the term "modification".) Each licensee is addressed as "you".
Activities other than copying, distribution and modification are not
covered by this License; they are outside its scope. The act of
running the Program is not restricted, and the output from the Program
is covered only if its contents constitute a work based on the
Program (independent of having been made by running the Program).
Whether that is true depends on what the Program does.
1. You may copy and distribute verbatim copies of the Program's
source code as you receive it, in any medium, provided that you
conspicuously and appropriately publish on each copy an appropriate
copyright notice and disclaimer of warranty; keep intact all the
notices that refer to this License and to the absence of any warranty;
and give any other recipients of the Program a copy of this License
along with the Program.
You may charge a fee for the physical act of transferring a copy, and
you may at your option offer warranty protection in exchange for a fee.
2. You may modify your copy or copies of the Program or any portion
of it, thus forming a work based on the Program, and copy and
distribute such modifications or work under the terms of Section 1
above, provided that you also meet all of these conditions:
a) You must cause the modified files to carry prominent notices
stating that you changed the files and the date of any change.
b) You must cause any work that you distribute or publish, that in
whole or in part contains or is derived from the Program or any
part thereof, to be licensed as a whole at no charge to all third
parties under the terms of this License.
c) If the modified program normally reads commands interactively
when run, you must cause it, when started running for such
interactive use in the most ordinary way, to print or display an
announcement including an appropriate copyright notice and a
notice that there is no warranty (or else, saying that you provide
a warranty) and that users may redistribute the program under
these conditions, and telling the user how to view a copy of this
License. (Exception: if the Program itself is interactive but
does not normally print such an announcement, your work based on
the Program is not required to print an announcement.)
These requirements apply to the modified work as a whole. If
identifiable sections of that work are not derived from the Program,
and can be reasonably considered independent and separate works in
themselves, then this License, and its terms, do not apply to those
sections when you distribute them as separate works. But when you
distribute the same sections as part of a whole which is a work based
on the Program, the distribution of the whole must be on the terms of
this License, whose permissions for other licensees extend to the
entire whole, and thus to each and every part regardless of who wrote it.
Thus, it is not the intent of this section to claim rights or contest
your rights to work written entirely by you; rather, the intent is to
exercise the right to control the distribution of derivative or
collective works based on the Program.
In addition, mere aggregation of another work not based on the Program
with the Program (or with a work based on the Program) on a volume of
a storage or distribution medium does not bring the other work under
the scope of this License.
3. You may copy and distribute the Program (or a work based on it,
under Section 2) in object code or executable form under the terms of
Sections 1 and 2 above provided that you also do one of the following:
a) Accompany it with the complete corresponding machine-readable
source code, which must be distributed under the terms of Sections
1 and 2 above on a medium customarily used for software interchange; or,
b) Accompany it with a written offer, valid for at least three
years, to give any third party, for a charge no more than your
cost of physically performing source distribution, a complete
machine-readable copy of the corresponding source code, to be
distributed under the terms of Sections 1 and 2 above on a medium
customarily used for software interchange; or,
c) Accompany it with the information you received as to the offer
to distribute corresponding source code. (This alternative is
allowed only for noncommercial distribution and only if you
received the program in object code or executable form with such
an offer, in accord with Subsection b above.)
The source code for a work means the preferred form of the work for
making modifications to it. For an executable work, complete source
code means all the source code for all modules it contains, plus any
associated interface definition files, plus the scripts used to
control compilation and installation of the executable. However, as a
special exception, the source code distributed need not include
anything that is normally distributed (in either source or binary
form) with the major components (compiler, kernel, and so on) of the
operating system on which the executable runs, unless that component
itself accompanies the executable.
If distribution of executable or object code is made by offering
access to copy from a designated place, then offering equivalent
access to copy the source code from the same place counts as
distribution of the source code, even though third parties are not
compelled to copy the source along with the object code.
4. You may not copy, modify, sublicense, or distribute the Program
except as expressly provided under this License. Any attempt
otherwise to copy, modify, sublicense or distribute the Program is
void, and will automatically terminate your rights under this License.
However, parties who have received copies, or rights, from you under
this License will not have their licenses terminated so long as such
parties remain in full compliance.
5. You are not required to accept this License, since you have not
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
the Program or works based on it.
6. Each time you redistribute the Program (or any work based on the
Program), the recipient automatically receives a license from the
original licensor to copy, distribute or modify the Program subject to
these terms and conditions. You may not impose any further
restrictions on the recipients' exercise of the rights granted herein.
You are not responsible for enforcing compliance by third parties to
this License.
7. If, as a consequence of a court judgment or allegation of patent
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
distribute so as to satisfy simultaneously your obligations under this
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
the only way you could satisfy both it and this License would be to
refrain entirely from distribution of the Program.
If any portion of this section is held invalid or unenforceable under
any particular circumstance, the balance of the section is intended to
apply and the section as a whole is intended to apply in other
circumstances.
It is not the purpose of this section to induce you to infringe any
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

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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
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.
To protect your rights, we need to make restrictions that forbid
anyone to deny you these rights or to ask you to surrender the rights.
These restrictions translate to certain responsibilities for you if you
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.
We protect your rights with two steps: (1) copyright the software, and
(2) offer you this license which gives you legal permission to copy,
distribute and/or modify the software.
Also, for each author's protection and ours, we want to make certain
that everyone understands that there is no warranty for this free
software. If the software is modified by someone else and passed on, we
want its recipients to know that what they have is not the original, so
that any problems introduced by others will not reflect on the original
authors' reputations.
Finally, any free program is threatened constantly by software
patents. We wish to avoid the danger that redistributors of a free
program will individually obtain patent licenses, in effect making the
program proprietary. To prevent this, we have made it clear that any
patent must be licensed for everyone's free use or not licensed at all.
The precise terms and conditions for copying, distribution and
modification follow.
GNU GENERAL PUBLIC LICENSE
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
0. This License applies to any program or other work which contains
a notice placed by the copyright holder saying it may be distributed
under the terms of this General Public License. The "Program", below,
refers to any such program or work, and a "work based on the Program"
means either the Program or any derivative work under copyright law:
that is to say, a work containing the Program or a portion of it,
either verbatim or with modifications and/or translated into another
language. (Hereinafter, translation is included without limitation in
the term "modification".) Each licensee is addressed as "you".
Activities other than copying, distribution and modification are not
covered by this License; they are outside its scope. The act of
running the Program is not restricted, and the output from the Program
is covered only if its contents constitute a work based on the
Program (independent of having been made by running the Program).
Whether that is true depends on what the Program does.
1. You may copy and distribute verbatim copies of the Program's
source code as you receive it, in any medium, provided that you
conspicuously and appropriately publish on each copy an appropriate
copyright notice and disclaimer of warranty; keep intact all the
notices that refer to this License and to the absence of any warranty;
and give any other recipients of the Program a copy of this License
along with the Program.
You may charge a fee for the physical act of transferring a copy, and
you may at your option offer warranty protection in exchange for a fee.
2. You may modify your copy or copies of the Program or any portion
of it, thus forming a work based on the Program, and copy and
distribute such modifications or work under the terms of Section 1
above, provided that you also meet all of these conditions:
a) You must cause the modified files to carry prominent notices
stating that you changed the files and the date of any change.
b) You must cause any work that you distribute or publish, that in
whole or in part contains or is derived from the Program or any
part thereof, to be licensed as a whole at no charge to all third
parties under the terms of this License.
c) If the modified program normally reads commands interactively
when run, you must cause it, when started running for such
interactive use in the most ordinary way, to print or display an
announcement including an appropriate copyright notice and a
notice that there is no warranty (or else, saying that you provide
a warranty) and that users may redistribute the program under
these conditions, and telling the user how to view a copy of this
License. (Exception: if the Program itself is interactive but
does not normally print such an announcement, your work based on
the Program is not required to print an announcement.)
These requirements apply to the modified work as a whole. If
identifiable sections of that work are not derived from the Program,
and can be reasonably considered independent and separate works in
themselves, then this License, and its terms, do not apply to those
sections when you distribute them as separate works. But when you
distribute the same sections as part of a whole which is a work based
on the Program, the distribution of the whole must be on the terms of
this License, whose permissions for other licensees extend to the
entire whole, and thus to each and every part regardless of who wrote it.
Thus, it is not the intent of this section to claim rights or contest
your rights to work written entirely by you; rather, the intent is to
exercise the right to control the distribution of derivative or
collective works based on the Program.
In addition, mere aggregation of another work not based on the Program
with the Program (or with a work based on the Program) on a volume of
a storage or distribution medium does not bring the other work under
the scope of this License.
3. You may copy and distribute the Program (or a work based on it,
under Section 2) in object code or executable form under the terms of
Sections 1 and 2 above provided that you also do one of the following:
a) Accompany it with the complete corresponding machine-readable
source code, which must be distributed under the terms of Sections
1 and 2 above on a medium customarily used for software interchange; or,
b) Accompany it with a written offer, valid for at least three
years, to give any third party, for a charge no more than your
cost of physically performing source distribution, a complete
machine-readable copy of the corresponding source code, to be
distributed under the terms of Sections 1 and 2 above on a medium
customarily used for software interchange; or,
c) Accompany it with the information you received as to the offer
to distribute corresponding source code. (This alternative is
allowed only for noncommercial distribution and only if you
received the program in object code or executable form with such
an offer, in accord with Subsection b above.)
The source code for a work means the preferred form of the work for
making modifications to it. For an executable work, complete source
code means all the source code for all modules it contains, plus any
associated interface definition files, plus the scripts used to
control compilation and installation of the executable. However, as a
special exception, the source code distributed need not include
anything that is normally distributed (in either source or binary
form) with the major components (compiler, kernel, and so on) of the
operating system on which the executable runs, unless that component
itself accompanies the executable.
If distribution of executable or object code is made by offering
access to copy from a designated place, then offering equivalent
access to copy the source code from the same place counts as
distribution of the source code, even though third parties are not
compelled to copy the source along with the object code.
4. You may not copy, modify, sublicense, or distribute the Program
except as expressly provided under this License. Any attempt
otherwise to copy, modify, sublicense or distribute the Program is
void, and will automatically terminate your rights under this License.
However, parties who have received copies, or rights, from you under
this License will not have their licenses terminated so long as such
parties remain in full compliance.
5. You are not required to accept this License, since you have not
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
the Program or works based on it.
6. Each time you redistribute the Program (or any work based on the
Program), the recipient automatically receives a license from the
original licensor to copy, distribute or modify the Program subject to
these terms and conditions. You may not impose any further
restrictions on the recipients' exercise of the rights granted herein.
You are not responsible for enforcing compliance by third parties to
this License.
7. If, as a consequence of a court judgment or allegation of patent
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
distribute so as to satisfy simultaneously your obligations under this
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
the only way you could satisfy both it and this License would be to
refrain entirely from distribution of the Program.
If any portion of this section is held invalid or unenforceable under
any particular circumstance, the balance of the section is intended to
apply and the section as a whole is intended to apply in other
circumstances.
It is not the purpose of this section to induce you to infringe any
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. Ifodifnperived from the Progr"work based on therogrdifneneraeuse 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 X FR TO 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 X FR TO NO WARRANTY
11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARQIS NO WARRATHERE IS NO WARRANTY
FOR THE
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