diff options
Diffstat (limited to 'lzip.h')
| -rw-r--r-- | lzip.h | 35 |
1 files changed, 24 insertions, 11 deletions
@@ -1,5 +1,5 @@ /* Lzip - LZMA lossless data compressor - Copyright (C) 2008-2018 Antonio Diaz Diaz. + Copyright (C) 2008-2019 Antonio Diaz Diaz. 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 @@ -134,7 +134,7 @@ public: { const std::string & s = filenames[i]; const unsigned len = ( s == "-" ) ? stdin_name_len : s.size(); - if( len > longest_name ) longest_name = len; + if( longest_name < len ) longest_name = len; } if( longest_name == 0 ) longest_name = stdin_name_len; } @@ -144,7 +144,7 @@ public: if( filename.size() && filename != "-" ) name_ = filename; else name_ = stdin_name; padded_name = " "; padded_name += name_; padded_name += ": "; - if( name_.size() < longest_name ) + if( longest_name > name_.size() ) padded_name.append( longest_name - name_.size(), ' ' ); first_post = true; } @@ -202,30 +202,30 @@ inline int real_bits( unsigned value ) } -const uint8_t magic_string[4] = { 0x4C, 0x5A, 0x49, 0x50 }; // "LZIP" +const uint8_t lzip_magic[4] = { 0x4C, 0x5A, 0x49, 0x50 }; // "LZIP" -struct File_header +struct Lzip_header { uint8_t data[6]; // 0-3 magic bytes // 4 version // 5 coded_dict_size enum { size = 6 }; - void set_magic() { std::memcpy( data, magic_string, 4 ); data[4] = 1; } + void set_magic() { std::memcpy( data, lzip_magic, 4 ); data[4] = 1; } bool verify_magic() const - { return ( std::memcmp( data, magic_string, 4 ) == 0 ); } + { return ( std::memcmp( data, lzip_magic, 4 ) == 0 ); } bool verify_prefix( const int sz ) const // detect (truncated) header { for( int i = 0; i < sz && i < 4; ++i ) - if( data[i] != magic_string[i] ) return false; + if( data[i] != lzip_magic[i] ) return false; return ( sz > 0 ); } bool verify_corrupt() const // detect corrupt header { int matches = 0; for( int i = 0; i < 4; ++i ) - if( data[i] == magic_string[i] ) ++matches; + if( data[i] == lzip_magic[i] ) ++matches; return ( matches > 1 && matches < 4 ); } @@ -257,12 +257,11 @@ struct File_header }; -struct File_trailer +struct Lzip_trailer { uint8_t data[20]; // 0-3 CRC32 of the uncompressed data // 4-11 size of the uncompressed data // 12-19 member size including header and trailer - enum { size = 20 }; unsigned data_crc() const @@ -294,6 +293,20 @@ struct File_trailer void member_size( unsigned long long sz ) { for( int i = 12; i <= 19; ++i ) { data[i] = (uint8_t)sz; sz >>= 8; } } + + bool verify_consistency() const // check internal consistency + { + const unsigned crc = data_crc(); + const unsigned long long dsize = data_size(); + if( ( crc == 0 ) != ( dsize == 0 ) ) return false; + const unsigned long long msize = member_size(); + if( msize < min_member_size ) return false; + const unsigned long long mlimit = ( 9 * dsize + 7 ) / 8 + min_member_size; + if( mlimit > dsize && msize > mlimit ) return false; + const unsigned long long dlimit = 7090 * ( msize - 26 ) - 1; + if( dlimit > msize && dsize > dlimit ) return false; + return true; + } }; |