From 81ce5751652e96e88a9a0d4cadd22dc18a02ea3d Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 7 Nov 2015 07:44:09 +0100 Subject: Adding upstream version 0.1. Signed-off-by: Daniel Baumann --- AUTHORS | 7 + ChangeLog | 10 + INSTALL | 60 +++++ Makefile.in | 104 ++++++++ NEWS | 3 + README | 29 +++ configure | 175 +++++++++++++ decoder.cc | 363 +++++++++++++++++++++++++++ main.cc | 114 +++++++++ testsuite/check.sh | 43 ++++ testsuite/test.txt | 676 ++++++++++++++++++++++++++++++++++++++++++++++++++ testsuite/test.txt.lz | Bin 0 -> 11518 bytes 12 files changed, 1584 insertions(+) create mode 100644 AUTHORS create mode 100644 ChangeLog create mode 100644 INSTALL create mode 100644 Makefile.in create mode 100644 NEWS create mode 100644 README create mode 100755 configure create mode 100644 decoder.cc create mode 100644 main.cc create mode 100755 testsuite/check.sh create mode 100644 testsuite/test.txt create mode 100644 testsuite/test.txt.lz diff --git a/AUTHORS b/AUTHORS new file mode 100644 index 0000000..a7b5945 --- /dev/null +++ b/AUTHORS @@ -0,0 +1,7 @@ +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). diff --git a/ChangeLog b/ChangeLog new file mode 100644 index 0000000..3a64682 --- /dev/null +++ b/ChangeLog @@ -0,0 +1,10 @@ +2013-03-21 Antonio Diaz Diaz + + * 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. diff --git a/INSTALL b/INSTALL new file mode 100644 index 0000000..54406be --- /dev/null +++ b/INSTALL @@ -0,0 +1,60 @@ +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. diff --git a/Makefile.in b/Makefile.in new file mode 100644 index 0000000..d313f51 --- /dev/null +++ b/Makefile.in @@ -0,0 +1,104 @@ + +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 diff --git a/NEWS b/NEWS new file mode 100644 index 0000000..5f057ce --- /dev/null +++ b/NEWS @@ -0,0 +1,3 @@ +Changes in version 0.1: + +Initial release. diff --git a/README b/README new file mode 100644 index 0000000..c7546a7 --- /dev/null +++ b/README @@ -0,0 +1,29 @@ +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. diff --git a/configure b/configure new file mode 100755 index 0000000..e2b6a47 --- /dev/null +++ b/configure @@ -0,0 +1,175 @@ +#! /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." diff --git a/decoder.cc b/decoder.cc new file mode 100644 index 0000000..fbfcdb3 --- /dev/null +++ b/decoder.cc @@ -0,0 +1,363 @@ +/* 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<> ( 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; + } diff --git a/main.cc b/main.cc new file mode 100644 index 0000000..e9c16a9 --- /dev/null +++ b/main.cc @@ -0,0 +1,114 @@ +/* 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 +#include +#include +#include +#include +#include +#include +#if defined(__MSVCRT__) || defined(__OS2__) +#include +#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; + } diff --git a/testsuite/check.sh b/testsuite/check.sh new file mode 100755 index 0000000..6dd7bb8 --- /dev/null +++ b/testsuite/check.sh @@ -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} diff --git a/testsuite/test.txt b/testsuite/test.txt new file mode 100644 index 0000000..5b244d5 --- /dev/null +++ b/testsuite/test.txt @@ -0,0 +1,676 @@ + + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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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 +. + diff --git a/testsuite/test.txt.lz b/testsuite/test.txt.lz new file mode 100644 index 0000000..4db881a Binary files /dev/null and b/testsuite/test.txt.lz differ -- cgit v1.2.3