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Adding upstream version 0.1.

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Signed-off-by: Daniel Baumann <daniel@debian.org>
This commit is contained in:
Daniel Baumann 2025-02-20 14:07:18 +01:00
parent 302a7744bc
commit 5bbf1f19af
Signed by: daniel
GPG key ID: FBB4F0E80A80222F
12 changed files with 1584 additions and 0 deletions
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7
AUTHORS Normal file
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Lzd was written by Antonio Diaz Diaz.
The ideas embodied in lzd are due to (at least) the following people:
Abraham Lempel and Jacob Ziv (for the LZ algorithm), Andrey Markov (for
the definition of Markov chains), G.N.N. Martin (for the definition of
range encoding), and Igor Pavlov (for putting all the above together in
LZMA).

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ChangeLog Normal file
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2013-03-21 Antonio Diaz Diaz <ant_diaz@teleline.es>
* Version 0.1 released.
Copyright (C) 2013 Antonio Diaz Diaz.
This file is a collection of facts, and thus it is not copyrightable,
but just in case, you have unlimited permission to copy, distribute and
modify it.

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INSTALL Normal file
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Requirements
------------
You will need a C++ compiler.
I use gcc 4.7.2 and 3.3.6, but the code should compile with any
standards compliant compiler.
Gcc is available at http://gcc.gnu.org.
Procedure
---------
1. Unpack the archive if you have not done so already:
lzip -cd lzip[version].tar.lz | tar -xf -
or
gzip -cd lzip[version].tar.gz | tar -xf -
This creates the directory ./lzip[version] containing the source from
the main archive.
2. Change to lzip directory and run configure.
(Try 'configure --help' for usage instructions).
cd lzip[version]
./configure
3. Run make.
make
4. Optionally, type 'make check' to run the tests that come with lzip.
5. Type 'make install' to install the program and any data files and
documentation.
You can install only the program, the info manual or the man page
typing 'make install-bin', 'make install-info' or 'make install-man'
respectively.
Another way
-----------
You can also compile lzip into a separate directory. To do this, you
must use a version of 'make' that supports the 'VPATH' variable, such
as GNU 'make'. 'cd' to the directory where you want the object files
and executables to go and run the 'configure' script. 'configure'
automatically checks for the source code in '.', in '..' and in the
directory that 'configure' is in.
'configure' recognizes the option '--srcdir=DIR' to control where to
look for the sources. Usually 'configure' can determine that directory
automatically.
After running 'configure', you can run 'make' and 'make install' as
explained above.
Copyright (C) 2008, 2009, 2010, 2011, 2012, 2013 Antonio Diaz Diaz.
This file is free documentation: you have unlimited permission to copy,
distribute and modify it.

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Makefile.in Normal file
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DISTNAME = $(pkgname)-$(pkgversion)
INSTALL = install
INSTALL_PROGRAM = $(INSTALL) -p -m 755
INSTALL_DATA = $(INSTALL) -p -m 644
INSTALL_DIR = $(INSTALL) -d -m 755
SHELL = /bin/sh
objs = main.o
.PHONY : all install install-bin install-info install-man install-strip \
uninstall uninstall-bin uninstall-info uninstall-man \
doc info man check dist clean distclean
all : $(progname)
$(progname) : $(objs)
$(CXX) $(LDFLAGS) -o $@ $(objs)
$(progname)_profiled : $(objs)
$(CXX) $(LDFLAGS) -pg -o $@ $(objs)
main.o : main.cc
$(CXX) $(CPPFLAGS) $(CXXFLAGS) -DPROGVERSION=\"$(pkgversion)\" -c -o $@ $<
%.o : %.cc
$(CXX) $(CPPFLAGS) $(CXXFLAGS) -c -o $@ $<
$(objs) : Makefile
main.o : decoder.cc
doc :
info : $(VPATH)/doc/$(pkgname).info
$(VPATH)/doc/$(pkgname).info : $(VPATH)/doc/$(pkgname).texinfo
cd $(VPATH)/doc && makeinfo $(pkgname).texinfo
man : $(VPATH)/doc/$(progname).1
$(VPATH)/doc/$(progname).1 : $(progname)
help2man -n 'educational decompressor for lzip files' \
-o $@ --no-info ./$(progname)
Makefile : $(VPATH)/configure $(VPATH)/Makefile.in
./config.status
check : all
@$(VPATH)/testsuite/check.sh $(VPATH)/testsuite $(pkgversion)
install : install-bin
install-bin : all
if [ ! -d "$(DESTDIR)$(bindir)" ] ; then $(INSTALL_DIR) "$(DESTDIR)$(bindir)" ; fi
$(INSTALL_PROGRAM) ./$(progname) "$(DESTDIR)$(bindir)/$(progname)"
install-info :
if [ ! -d "$(DESTDIR)$(infodir)" ] ; then $(INSTALL_DIR) "$(DESTDIR)$(infodir)" ; fi
$(INSTALL_DATA) $(VPATH)/doc/$(pkgname).info "$(DESTDIR)$(infodir)/$(pkgname).info"
-install-info --info-dir="$(DESTDIR)$(infodir)" "$(DESTDIR)$(infodir)/$(pkgname).info"
install-man :
if [ ! -d "$(DESTDIR)$(mandir)/man1" ] ; then $(INSTALL_DIR) "$(DESTDIR)$(mandir)/man1" ; fi
$(INSTALL_DATA) $(VPATH)/doc/$(progname).1 "$(DESTDIR)$(mandir)/man1/$(progname).1"
install-strip : all
$(MAKE) INSTALL_PROGRAM='$(INSTALL_PROGRAM) -s' install
uninstall : uninstall-bin uninstall-info uninstall-man
uninstall-bin :
-rm -f "$(DESTDIR)$(bindir)/$(progname)"
uninstall-info :
-install-info --info-dir="$(DESTDIR)$(infodir)" --remove "$(DESTDIR)$(infodir)/$(pkgname).info"
-rm -f "$(DESTDIR)$(infodir)/$(pkgname).info"
uninstall-man :
-rm -f "$(DESTDIR)$(mandir)/man1/$(progname).1"
dist : doc
ln -sf $(VPATH) $(DISTNAME)
tar -cvf $(DISTNAME).tar \
$(DISTNAME)/AUTHORS \
$(DISTNAME)/ChangeLog \
$(DISTNAME)/INSTALL \
$(DISTNAME)/Makefile.in \
$(DISTNAME)/NEWS \
$(DISTNAME)/README \
$(DISTNAME)/configure \
$(DISTNAME)/testsuite/check.sh \
$(DISTNAME)/testsuite/test.txt \
$(DISTNAME)/testsuite/test.txt.lz \
$(DISTNAME)/*.cc
rm -f $(DISTNAME)
lzip -v -9 $(DISTNAME).tar
clean :
-rm -f $(progname) $(progname)_profiled $(objs)
distclean : clean
-rm -f Makefile config.status *.tar *.tar.lz

3
NEWS Normal file
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Changes in version 0.1:
Initial release.

29
README Normal file
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Description
Lzd is a very simplified decompressor for lzip files with an educational
purpose. Studying its source is a good first step to understand how lzip
works. It is not safe to use lzd for any real work.
The source of lzd is also used in the lzip manual as a reference
decompressor in the description of the lzip file format.
Lzd decompresses from standard input to standard output. Lzd will
correctly decompress the concatenation of two or more compressed files.
The result is the concatenation of the corresponding decompressed data.
Integrity of such concatenated compressed input is also verified.
The ideas embodied in lzd are due to (at least) the following people:
Abraham Lempel and Jacob Ziv (for the LZ algorithm), Andrey Markov (for
the definition of Markov chains), G.N.N. Martin (for the definition of
range encoding), and Igor Pavlov (for putting all the above together in
LZMA).
Copyright (C) 2013 Antonio Diaz Diaz.
This file is free documentation: you have unlimited permission to copy,
distribute and modify it.
The file Makefile.in is a data file used by configure to produce the
Makefile. It has the same copyright owner and permissions that configure
itself.

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configure vendored Executable file
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#! /bin/sh
# configure script for Lzd - Educational decompressor for lzip files
# Copyright (C) 2013 Antonio Diaz Diaz.
#
# This configure script is free software: you have unlimited permission
# to copy, distribute and modify it.
args=
no_create=
pkgname=lzd
pkgversion=0.1
progname=lzd
srctrigger=decoder.cc
# clear some things potentially inherited from environment.
LC_ALL=C
export LC_ALL
srcdir=
prefix=/usr/local
exec_prefix='$(prefix)'
bindir='$(exec_prefix)/bin'
datarootdir='$(prefix)/share'
infodir='$(datarootdir)/info'
mandir='$(datarootdir)/man'
CXX=g++
CPPFLAGS=
CXXFLAGS='-Wall -W -O2'
LDFLAGS=
# checking whether we are using GNU C++.
if [ ! -x /bin/g++ ] &&
[ ! -x /usr/bin/g++ ] &&
[ ! -x /usr/local/bin/g++ ] ; then
CXX=c++
CXXFLAGS='-W -O2'
fi
# Loop over all args
while [ -n "$1" ] ; do
# Get the first arg, and shuffle
option=$1
shift
# Add the argument quoted to args
args="${args} \"${option}\""
# Split out the argument for options that take them
case ${option} in
*=*) optarg=`echo ${option} | sed -e 's,^[^=]*=,,;s,/$,,'` ;;
esac
# Process the options
case ${option} in
--help | -h)
echo "Usage: configure [options]"
echo
echo "Options: [defaults in brackets]"
echo " -h, --help display this help and exit"
echo " -V, --version output version information and exit"
echo " --srcdir=DIR find the sources in DIR [. or ..]"
echo " --prefix=DIR install into DIR [${prefix}]"
echo " --exec-prefix=DIR base directory for arch-dependent files [${exec_prefix}]"
echo " --bindir=DIR user executables directory [${bindir}]"
echo " --datarootdir=DIR base directory for doc and data [${datarootdir}]"
echo " --infodir=DIR info files directory [${infodir}]"
echo " --mandir=DIR man pages directory [${mandir}]"
echo " CXX=COMPILER C++ compiler to use [g++]"
echo " CPPFLAGS=OPTIONS command line options for the preprocessor [${CPPFLAGS}]"
echo " CXXFLAGS=OPTIONS command line options for the C++ compiler [${CXXFLAGS}]"
echo " LDFLAGS=OPTIONS command line options for the linker [${LDFLAGS}]"
echo
exit 0 ;;
--version | -V)
echo "Configure script for ${pkgname} version ${pkgversion}"
exit 0 ;;
--srcdir=*) srcdir=${optarg} ;;
--prefix=*) prefix=${optarg} ;;
--exec-prefix=*) exec_prefix=${optarg} ;;
--bindir=*) bindir=${optarg} ;;
--datarootdir=*) datarootdir=${optarg} ;;
--infodir=*) infodir=${optarg} ;;
--mandir=*) mandir=${optarg} ;;
--no-create) no_create=yes ;;
CXX=*) CXX=${optarg} ;;
CPPFLAGS=*) CPPFLAGS=${optarg} ;;
CXXFLAGS=*) CXXFLAGS=${optarg} ;;
LDFLAGS=*) LDFLAGS=${optarg} ;;
--* | *=* | *-*-*) ;;
*)
echo "configure: Unrecognized option: \"${option}\"; use --help for usage." 1>&2
exit 1 ;;
esac
done
# Find the source files, if location was not specified.
srcdirtext=
if [ -z "${srcdir}" ] ; then
srcdirtext="or . or .." ; srcdir=.
if [ ! -r "${srcdir}/${srctrigger}" ] ; then srcdir=.. ; fi
if [ ! -r "${srcdir}/${srctrigger}" ] ; then
## the sed command below emulates the dirname command
srcdir=`echo $0 | sed -e 's,[^/]*$,,;s,/$,,;s,^$,.,'`
fi
fi
if [ ! -r "${srcdir}/${srctrigger}" ] ; then
exec 1>&2
echo
echo "configure: Can't find sources in ${srcdir} ${srcdirtext}"
echo "configure: (At least ${srctrigger} is missing)."
exit 1
fi
# Set srcdir to . if that's what it is.
if [ "`pwd`" = "`cd "${srcdir}" ; pwd`" ] ; then srcdir=. ; fi
echo
if [ -z "${no_create}" ] ; then
echo "creating config.status"
rm -f config.status
cat > config.status << EOF
#! /bin/sh
# This file was generated automatically by configure. Do not edit.
# Run this file to recreate the current configuration.
#
# This script is free software: you have unlimited permission
# to copy, distribute and modify it.
exec /bin/sh $0 ${args} --no-create
EOF
chmod +x config.status
fi
echo "creating Makefile"
echo "VPATH = ${srcdir}"
echo "prefix = ${prefix}"
echo "exec_prefix = ${exec_prefix}"
echo "bindir = ${bindir}"
echo "datarootdir = ${datarootdir}"
echo "infodir = ${infodir}"
echo "mandir = ${mandir}"
echo "CXX = ${CXX}"
echo "CPPFLAGS = ${CPPFLAGS}"
echo "CXXFLAGS = ${CXXFLAGS}"
echo "LDFLAGS = ${LDFLAGS}"
rm -f Makefile
cat > Makefile << EOF
# Makefile for Lzd - Educational decompressor for lzip files
# Copyright (C) 2013 Antonio Diaz Diaz.
# This file was generated automatically by configure. Do not edit.
#
# This Makefile is free software: you have unlimited permission
# to copy, distribute and modify it.
pkgname = ${pkgname}
pkgversion = ${pkgversion}
progname = ${progname}
VPATH = ${srcdir}
prefix = ${prefix}
exec_prefix = ${exec_prefix}
bindir = ${bindir}
datarootdir = ${datarootdir}
infodir = ${infodir}
mandir = ${mandir}
CXX = ${CXX}
CPPFLAGS = ${CPPFLAGS}
CXXFLAGS = ${CXXFLAGS}
LDFLAGS = ${LDFLAGS}
EOF
cat "${srcdir}/Makefile.in" >> Makefile
echo "OK. Now you can run make."

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/* Lzd - Educational decompressor for lzip files
Copyright (C) 2013 Antonio Diaz Diaz.
This program is free software: you have unlimited permission
to copy, distribute and modify it.
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.
*/
class State
{
int st;
public:
enum { states = 12 };
State() : st( 0 ) {}
int operator()() const { return st; }
bool is_char() const { return st < 7; }
void set_char()
{
static const int next[states] = { 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 4, 5 };
st = next[st];
}
void set_match() { st = ( ( st < 7 ) ? 7 : 10 ); }
void set_rep() { st = ( ( st < 7 ) ? 8 : 11 ); }
void set_short_rep() { st = ( ( st < 7 ) ? 9 : 11 ); }
};
enum {
literal_context_bits = 3,
pos_state_bits = 2,
pos_states = 1 << pos_state_bits,
pos_state_mask = pos_states - 1,
max_dis_states = 4,
dis_slot_bits = 6,
start_dis_model = 4,
end_dis_model = 14,
modeled_distances = 1 << (end_dis_model / 2), // 128
dis_align_bits = 4,
dis_align_size = 1 << dis_align_bits,
len_low_bits = 3,
len_mid_bits = 3,
len_high_bits = 8,
len_low_symbols = 1 << len_low_bits,
len_mid_symbols = 1 << len_mid_bits,
len_high_symbols = 1 << len_high_bits,
max_len_symbols = len_low_symbols + len_mid_symbols + len_high_symbols,
min_match_len = 2, // must be 2
bit_model_move_bits = 5,
bit_model_total_bits = 11,
bit_model_total = 1 << bit_model_total_bits };
struct Bit_model
{
int probability;
Bit_model() : probability( bit_model_total / 2 ) {}
};
struct Len_model
{
Bit_model choice1;
Bit_model choice2;
Bit_model bm_low[pos_states][len_low_symbols];
Bit_model bm_mid[pos_states][len_mid_symbols];
Bit_model bm_high[len_high_symbols];
};
class Range_decoder
{
uint32_t code;
uint32_t range;
public:
Range_decoder() : code( 0 ), range( 0xFFFFFFFFU )
{
for( int i = 0; i < 5; ++i ) code = (code << 8) | std::getc( stdin );
}
int decode( const int num_bits )
{
int symbol = 0;
for( int i = 0; i < num_bits; ++i )
{
range >>= 1;
symbol <<= 1;
if( code >= range ) { code -= range; symbol |= 1; }
if( range <= 0x00FFFFFFU ) // normalize
{ range <<= 8; code = (code << 8) | std::getc( stdin ); }
}
return symbol;
}
int decode_bit( Bit_model & bm )
{
int symbol;
const uint32_t bound = ( range >> bit_model_total_bits ) * bm.probability;
if( code < bound )
{
range = bound;
bm.probability += (bit_model_total - bm.probability) >> bit_model_move_bits;
symbol = 0;
}
else
{
range -= bound;
code -= bound;
bm.probability -= bm.probability >> bit_model_move_bits;
symbol = 1;
}
if( range <= 0x00FFFFFFU ) // normalize
{ range <<= 8; code = (code << 8) | std::getc( stdin ); }
return symbol;
}
int decode_tree( Bit_model bm[], const int num_bits )
{
int symbol = 1;
for( int i = 0; i < num_bits; ++i )
symbol = ( symbol << 1 ) | decode_bit( bm[symbol] );
return symbol - (1 << num_bits);
}
int decode_tree_reversed( Bit_model bm[], const int num_bits )
{
int symbol = decode_tree( bm, num_bits );
int reversed_symbol = 0;
for( int i = 0; i < num_bits; ++i )
{
reversed_symbol = ( reversed_symbol << 1 ) | ( symbol & 1 );
symbol >>= 1;
}
return reversed_symbol;
}
int decode_matched( Bit_model bm[], const int match_byte )
{
Bit_model * const bm1 = bm + 0x100;
int symbol = 1;
for( int i = 7; i >= 0; --i )
{
const int match_bit = ( match_byte >> i ) & 1;
const int bit = decode_bit( bm1[(match_bit<<8)+symbol] );
symbol = ( symbol << 1 ) | bit;
if( match_bit != bit )
{
while( symbol < 0x100 )
symbol = ( symbol << 1 ) | decode_bit( bm[symbol] );
break;
}
}
return symbol - 0x100;
}
int decode_len( Len_model & lm, const int pos_state )
{
if( decode_bit( lm.choice1 ) == 0 )
return min_match_len +
decode_tree( lm.bm_low[pos_state], len_low_bits );
if( decode_bit( lm.choice2 ) == 0 )
return min_match_len + len_low_symbols +
decode_tree( lm.bm_mid[pos_state], len_mid_bits );
return min_match_len + len_low_symbols + len_mid_symbols +
decode_tree( lm.bm_high, len_high_bits );
}
};
class LZ_decoder
{
unsigned long long partial_data_pos;
Range_decoder rdec;
const unsigned dictionary_size;
uint8_t * const buffer; // output buffer
unsigned pos; // current pos in buffer
unsigned stream_pos; // first byte not yet written to stdout
uint32_t crc_;
void flush_data();
uint8_t get_byte( const unsigned distance ) const
{
int i = pos - distance - 1;
if( i < 0 ) i += dictionary_size;
return buffer[i];
}
void put_byte( const uint8_t b )
{
buffer[pos] = b;
if( ++pos >= dictionary_size ) flush_data();
}
public:
LZ_decoder( const unsigned dict_size )
:
partial_data_pos( 0 ),
dictionary_size( dict_size ),
buffer( new uint8_t[dictionary_size] ),
pos( 0 ),
stream_pos( 0 ),
crc_( 0xFFFFFFFFU )
{ buffer[dictionary_size-1] = 0; } // prev_byte of first_byte
~LZ_decoder() { delete[] buffer; }
unsigned crc() const { return crc_ ^ 0xFFFFFFFFU; }
unsigned long long data_position() const { return partial_data_pos + pos; }
bool decode_member();
};
class CRC32
{
uint32_t data[256]; // Table of CRCs of all 8-bit messages.
public:
CRC32()
{
for( unsigned n = 0; n < 256; ++n )
{
unsigned c = n;
for( int k = 0; k < 8; ++k )
{ if( c & 1 ) c = 0xEDB88320U ^ ( c >> 1 ); else c >>= 1; }
data[n] = c;
}
}
void update( uint32_t & crc, const uint8_t * buffer, const int size ) const
{
for( int i = 0; i < size; ++i )
crc = data[(crc^buffer[i])&0xFF] ^ ( crc >> 8 );
}
};
const CRC32 crc32;
void LZ_decoder::flush_data()
{
if( pos > stream_pos )
{
const unsigned size = pos - stream_pos;
crc32.update( crc_, buffer + stream_pos, size );
errno = 0;
if( std::fwrite( buffer + stream_pos, 1, size, stdout ) != size )
{ std::fprintf( stderr, "Write error: %s\n", std::strerror( errno ) );
std::exit( 1 ); }
if( pos >= dictionary_size ) { partial_data_pos += pos; pos = 0; }
stream_pos = pos;
}
}
bool LZ_decoder::decode_member() // Returns false if error
{
Bit_model bm_literal[1<<literal_context_bits][0x300];
Bit_model bm_match[State::states][pos_states];
Bit_model bm_rep[State::states];
Bit_model bm_rep0[State::states];
Bit_model bm_rep1[State::states];
Bit_model bm_rep2[State::states];
Bit_model bm_len[State::states][pos_states];
Bit_model bm_dis_slot[max_dis_states][1<<dis_slot_bits];
Bit_model bm_dis[modeled_distances-end_dis_model];
Bit_model bm_align[dis_align_size];
Len_model match_len_model;
Len_model rep_len_model;
unsigned rep0 = 0; // rep[0-3] latest four distances
unsigned rep1 = 0; // used for efficient coding of
unsigned rep2 = 0; // repeated distances
unsigned rep3 = 0;
State state;
while( !std::feof( stdin ) && !std::ferror( stdin ) )
{
const int pos_state = data_position() & pos_state_mask;
if( rdec.decode_bit( bm_match[state()][pos_state] ) == 0 ) // 1st bit
{
const uint8_t prev_byte = get_byte( 0 );
const int literal_state = prev_byte >> ( 8 - literal_context_bits );
Bit_model * const bm = bm_literal[literal_state];
if( state.is_char() )
put_byte( rdec.decode_tree( bm, 8 ) );
else
put_byte( rdec.decode_matched( bm, get_byte( rep0 ) ) );
state.set_char();
}
else
{
int len;
if( rdec.decode_bit( bm_rep[state()] ) == 1 ) // 2nd bit
{
if( rdec.decode_bit( bm_rep0[state()] ) == 0 ) // 3rd bit
{
if( rdec.decode_bit( bm_len[state()][pos_state] ) == 0 ) // 4th bit
{ state.set_short_rep(); put_byte( get_byte( rep0 ) ); continue; }
}
else
{
unsigned distance;
if( rdec.decode_bit( bm_rep1[state()] ) == 0 ) // 4th bit
distance = rep1;
else
{
if( rdec.decode_bit( bm_rep2[state()] ) == 0 ) // 5th bit
distance = rep2;
else
{ distance = rep3; rep3 = rep2; }
rep2 = rep1;
}
rep1 = rep0;
rep0 = distance;
}
len = rdec.decode_len( rep_len_model, pos_state );
state.set_rep();
}
else
{
rep3 = rep2; rep2 = rep1; rep1 = rep0;
len = rdec.decode_len( match_len_model, pos_state );
const int dis_state = std::min( len - min_match_len, max_dis_states - 1 );
const int dis_slot =
rdec.decode_tree( bm_dis_slot[dis_state], dis_slot_bits );
if( dis_slot < start_dis_model ) rep0 = dis_slot;
else
{
const int direct_bits = ( dis_slot >> 1 ) - 1;
rep0 = ( 2 | ( dis_slot & 1 ) ) << direct_bits;
if( dis_slot < end_dis_model )
rep0 += rdec.decode_tree_reversed( bm_dis + rep0 - dis_slot - 1,
direct_bits );
else
{
rep0 += rdec.decode( direct_bits - dis_align_bits ) << dis_align_bits;
rep0 += rdec.decode_tree_reversed( bm_align, dis_align_bits );
if( rep0 == 0xFFFFFFFFU ) // Marker found
{
flush_data();
return ( len == min_match_len ); // End Of Stream marker
}
}
}
state.set_match();
if( rep0 >= dictionary_size || ( rep0 >= pos && !partial_data_pos ) )
return false;
}
for( int i = 0; i < len; ++i )
put_byte( get_byte( rep0 ) );
}
}
return false;
}

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/* Lzd - Educational decompressor for lzip files
Copyright (C) 2013 Antonio Diaz Diaz.
This program is free software: you have unlimited permission
to copy, distribute and modify it.
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.
*/
/*
Return values: 0 for a normal exit, 1 for environmental problems
(file not found, invalid flags, I/O errors, etc), 2 to indicate a
corrupt or invalid input file.
*/
#include <algorithm>
#include <cerrno>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <stdint.h>
#include <unistd.h>
#if defined(__MSVCRT__) || defined(__OS2__)
#include <io.h>
#endif
#include "decoder.cc"
enum { min_dictionary_size = 1 << 12,
max_dictionary_size = 1 << 29 };
typedef uint8_t File_header[6]; // 0-3 magic, 4 version, 5 coded_dict_size
typedef uint8_t File_trailer[20];
// 0-3 CRC32 of the uncompressed data
// 4-11 size of the uncompressed data
// 12-19 member size including header and trailer
int main( const int argc, const char * const argv[] )
{
if( argc > 1 )
{
std::printf( "Lzd %s - Educational decompressor for lzip files.\n",
PROGVERSION );
std::printf( "Study the source to learn how a simple lzip decompressor works.\n"
"It is not safe to use it for any real work.\n"
"\nUsage: %s < file.lz > file\n", argv[0] );
std::printf( "Lzd decompresses from standard input to standard output.\n"
"\nCopyright (C) 2013 Antonio Diaz Diaz.\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"
"Report bugs to lzip-bug@nongnu.org\n"
"Lzip home page: http://www.nongnu.org/lzip/lzip.html\n" );
return 0;
}
#if defined(__MSVCRT__) || defined(__OS2__)
setmode( STDIN_FILENO, O_BINARY );
setmode( STDOUT_FILENO, O_BINARY );
#endif
if( isatty( STDIN_FILENO ) )
{
std::fprintf( stderr, "I won't read compressed data from a terminal.\n"
"Try '%s --help' for more information.\n", argv[0] );
return 1;
}
for( bool first_member = true; ; first_member = false )
{
File_header header;
for( int i = 0; i < 6; ++i )
header[i] = std::getc( stdin );
if( std::feof( stdin ) || std::memcmp( header, "LZIP", 4 ) != 0 )
{
if( first_member )
{ std::fprintf( stderr, "Bad magic number (file not in lzip format)\n" );
return 2; }
break;
}
if( header[4] != 1 )
{
std::fprintf( stderr, "Version %d member format not supported.\n",
header[4] );
return 2;
}
unsigned dict_size = 1 << ( header[5] & 0x1F );
dict_size -= ( dict_size / 16 ) * ( ( header[5] >> 5 ) & 7 );
if( dict_size < min_dictionary_size || dict_size > max_dictionary_size )
{ std::fprintf( stderr, "Invalid dictionary size in member header\n" );
return 2; }
LZ_decoder decoder( dict_size );
if( !decoder.decode_member() )
{ std::fprintf( stderr, "Data error\n" ); return 2; }
File_trailer trailer;
for( int i = 0; i < 20; ++i ) trailer[i] = std::getc( stdin );
unsigned crc = 0;
for( int i = 3; i >= 0; --i ) { crc <<= 8; crc += trailer[i]; }
unsigned long long data_size = 0;
for( int i = 11; i >= 4; --i ) { data_size <<= 8; data_size += trailer[i]; }
if( crc != decoder.crc() || data_size != decoder.data_position() )
{ std::fprintf( stderr, "CRC error\n" ); return 2; }
}
if( std::fclose( stdout ) != 0 )
{ std::fprintf( stderr, "Can't close stdout: %s\n", std::strerror( errno ) );
return 1; }
return 0;
}

43
testsuite/check.sh Executable file
View file

@ -0,0 +1,43 @@
#! /bin/sh
# check script for Lzd - Educational decompressor for lzip files
# Copyright (C) 2013 Antonio Diaz Diaz.
#
# This script is free software: you have unlimited permission
# to copy, distribute and modify it.
LC_ALL=C
export LC_ALL
objdir=`pwd`
testdir=`cd "$1" ; pwd`
LZIP="${objdir}"/lzd
framework_failure() { echo "failure in testing framework" ; exit 1 ; }
if [ ! -x "${LZIP}" ] ; then
echo "${LZIP}: cannot execute"
exit 1
fi
if [ -d tmp ] ; then rm -rf tmp ; fi
mkdir tmp
cd "${objdir}"/tmp
in="${testdir}"/test.txt
in_lz="${testdir}"/test.txt.lz
fail=0
printf "testing lzd-%s..." "$2"
"${LZIP}" < "${in_lz}" | cmp "${in}" - || fail=1
printf .
cat "${in_lz}" "${in_lz}" | "${LZIP}" > copy2 || fail=1
cat "${in}" "${in}" | cmp copy2 - || fail=1
printf .
echo
if [ ${fail} = 0 ] ; then
echo "tests completed successfully."
cd "${objdir}" && rm -r tmp
else
echo "tests failed."
fi
exit ${fail}

676
testsuite/test.txt Normal file
View file

@ -0,0 +1,676 @@
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Each version is given a distinguishing version number. If the
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Public License "or any later version" applies to it, you have the
option of following the terms and conditions either of that numbered
version or of any later version published by the Free Software
Foundation. If the Program does not specify a version number of the
GNU General Public License, you may choose any version ever published
by the Free Software Foundation.
If the Program specifies that a proxy can decide which future
versions of the GNU General Public License can be used, that proxy's
public statement of acceptance of a version permanently authorizes you
to choose that version for the Program.
Later license versions may give you additional or different
permissions. However, no additional obligations are imposed on any
author or copyright holder as a result of your choosing to follow a
later version.
15. Disclaimer of Warranty.
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.
16. Limitation of Liability.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
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.
17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
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
state 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 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<http://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<http://www.gnu.org/philosophy/why-not-lgpl.html>.

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