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authorDaniel Baumann <mail@daniel-baumann.ch>2015-11-07 06:46:08 +0000
committerDaniel Baumann <mail@daniel-baumann.ch>2015-11-07 06:46:08 +0000
commite6bcf5521e9808ed9276ca1b5ee97f71bb3e549b (patch)
treed5ca55f92c9ded3e6612831f4b9fb82c33a11592 /main.cc
parentAdding debian version 0.2-3. (diff)
downloadlzd-e6bcf5521e9808ed9276ca1b5ee97f71bb3e549b.tar.xz
lzd-e6bcf5521e9808ed9276ca1b5ee97f71bb3e549b.zip
Merging upstream version 0.3.
Signed-off-by: Daniel Baumann <mail@daniel-baumann.ch>
Diffstat (limited to 'main.cc')
-rw-r--r--main.cc115
1 files changed, 0 insertions, 115 deletions
diff --git a/main.cc b/main.cc
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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.
-*/
-/*
- Exit status: 0 for a normal exit, 1 for environmental problems
- (file not found, invalid flags, I/O errors, etc), 2 to indicate a
- corrupt or invalid input file.
-*/
-
-#include <algorithm>
-#include <cerrno>
-#include <cstdio>
-#include <cstdlib>
-#include <cstring>
-#include <stdint.h>
-#include <unistd.h>
-#if defined(__MSVCRT__) || defined(__OS2__)
-#include <fcntl.h>
-#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;
- }