diff options
Diffstat (limited to 'lzip_index.cc')
| -rw-r--r-- | lzip_index.cc | 98 |
1 files changed, 51 insertions, 47 deletions
diff --git a/lzip_index.cc b/lzip_index.cc index b64fb36..6c1caf2 100644 --- a/lzip_index.cc +++ b/lzip_index.cc @@ -1,5 +1,5 @@ /* Lzip - LZMA lossless data compressor - Copyright (C) 2008-2022 Antonio Diaz Diaz. + Copyright (C) 2008-2024 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 @@ -43,15 +43,15 @@ int seek_read( const int fd, uint8_t * const buf, const int size, } // end namespace -bool Lzip_index::check_header_error( const Lzip_header & header ) +bool Lzip_index::check_header( const Lzip_header & header ) { - if( !header.verify_magic() ) - { error_ = bad_magic_msg; retval_ = 2; return true; } - if( !header.verify_version() ) - { error_ = bad_version( header.version() ); retval_ = 2; return true; } + if( !header.check_magic() ) + { error_ = bad_magic_msg; retval_ = 2; return false; } + if( !header.check_version() ) + { error_ = bad_version( header.version() ); retval_ = 2; return false; } if( !isvalid_ds( header.dictionary_size() ) ) - { error_ = bad_dict_msg; retval_ = 2; return true; } - return false; + { error_ = bad_dict_msg; retval_ = 2; return false; } + return true; } void Lzip_index::set_errno_error( const char * const msg ) @@ -70,18 +70,20 @@ void Lzip_index::set_num_error( const char * const msg, unsigned long long num ) bool Lzip_index::read_header( const int fd, Lzip_header & header, - const long long pos ) + const long long pos, const bool ignore_marking ) { - if( seek_read( fd, header.data, Lzip_header::size, pos ) != Lzip_header::size ) + if( seek_read( fd, header.data, header.size, pos ) != header.size ) { set_errno_error( "Error reading member header: " ); return false; } + uint8_t byte; + if( !ignore_marking && readblock( fd, &byte, 1 ) == 1 && byte != 0 ) + { error_ = marking_msg; retval_ = 2; return false; } return true; } // If successful, push last member and set pos to member header. bool Lzip_index::skip_trailing_data( const int fd, unsigned long long & pos, - const bool ignore_trailing, - const bool loose_trailing ) + const Cl_options & cl_opts ) { if( pos < min_member_size ) return false; enum { block_size = 16384, @@ -102,34 +104,37 @@ bool Lzip_index::skip_trailing_data( const int fd, unsigned long long & pos, if( buffer[i-1] <= max_msb ) // most significant byte of member_size { const Lzip_trailer & trailer = - *(const Lzip_trailer *)( buffer + i - Lzip_trailer::size ); + *(const Lzip_trailer *)( buffer + i - trailer.size ); const unsigned long long member_size = trailer.member_size(); if( member_size == 0 ) // skip trailing zeros - { while( i > Lzip_trailer::size && buffer[i-9] == 0 ) --i; continue; } - if( member_size > ipos + i || !trailer.verify_consistency() ) - continue; + { while( i > trailer.size && buffer[i-9] == 0 ) --i; continue; } + if( member_size > ipos + i || !trailer.check_consistency() ) continue; Lzip_header header; - if( !read_header( fd, header, ipos + i - member_size ) ) return false; - if( !header.verify() ) continue; + if( !read_header( fd, header, ipos + i - member_size, + cl_opts.ignore_marking ) ) return false; + if( !header.check() ) continue; const Lzip_header & header2 = *(const Lzip_header *)( buffer + i ); - const bool full_h2 = bsize - i >= Lzip_header::size; - if( header2.verify_prefix( bsize - i ) ) // last member + const bool full_h2 = bsize - i >= header.size; + if( header2.check_prefix( bsize - i ) ) // last member { if( !full_h2 ) error_ = "Last member in input file is truncated."; - else if( !check_header_error( header2 ) ) + else if( check_header( header2 ) ) error_ = "Last member in input file is truncated or corrupt."; retval_ = 2; return false; } - if( !loose_trailing && full_h2 && header2.verify_corrupt() ) + if( !cl_opts.loose_trailing && full_h2 && header2.check_corrupt() ) { error_ = corrupt_mm_msg; retval_ = 2; return false; } - if( !ignore_trailing ) + if( !cl_opts.ignore_trailing ) { error_ = trailing_msg; retval_ = 2; return false; } - pos = ipos + i - member_size; + const unsigned long long data_size = trailer.data_size(); + if( !cl_opts.ignore_empty && data_size == 0 ) + { error_ = empty_msg; retval_ = 2; return false; } + pos = ipos + i - member_size; // good member const unsigned dictionary_size = header.dictionary_size(); - member_vector.push_back( Member( 0, trailer.data_size(), pos, - member_size, dictionary_size ) ); if( dictionary_size_ < dictionary_size ) dictionary_size_ = dictionary_size; + member_vector.push_back( Member( 0, data_size, pos, member_size, + dictionary_size ) ); return true; } if( ipos == 0 ) @@ -144,8 +149,7 @@ bool Lzip_index::skip_trailing_data( const int fd, unsigned long long & pos, } -Lzip_index::Lzip_index( const int infd, const bool ignore_trailing, - const bool loose_trailing ) +Lzip_index::Lzip_index( const int infd, const Cl_options & cl_opts ) : insize( lseek( infd, 0, SEEK_END ) ), retval_( 0 ), dictionary_size_( 0 ) { if( insize < 0 ) @@ -157,42 +161,42 @@ Lzip_index::Lzip_index( const int infd, const bool ignore_trailing, retval_ = 2; return; } Lzip_header header; - if( !read_header( infd, header, 0 ) ) return; - if( check_header_error( header ) ) return; + if( !read_header( infd, header, 0, cl_opts.ignore_marking ) || + !check_header( header ) ) return; unsigned long long pos = insize; // always points to a header or to EOF while( pos >= min_member_size ) { Lzip_trailer trailer; - if( seek_read( infd, trailer.data, Lzip_trailer::size, - pos - Lzip_trailer::size ) != Lzip_trailer::size ) + if( seek_read( infd, trailer.data, trailer.size, pos - trailer.size ) != + trailer.size ) { set_errno_error( "Error reading member trailer: " ); break; } const unsigned long long member_size = trailer.member_size(); - if( member_size > pos || !trailer.verify_consistency() ) // bad trailer + if( member_size > pos || !trailer.check_consistency() ) // bad trailer { if( member_vector.empty() ) - { if( skip_trailing_data( infd, pos, ignore_trailing, loose_trailing ) ) - continue; else return; } - set_num_error( "Bad trailer at pos ", pos - Lzip_trailer::size ); - break; + { if( skip_trailing_data( infd, pos, cl_opts ) ) continue; return; } + set_num_error( "Bad trailer at pos ", pos - trailer.size ); break; } - if( !read_header( infd, header, pos - member_size ) ) break; - if( !header.verify() ) // bad header + if( !read_header( infd, header, pos - member_size, cl_opts.ignore_marking ) ) + break; + if( !header.check() ) // bad header { if( member_vector.empty() ) - { if( skip_trailing_data( infd, pos, ignore_trailing, loose_trailing ) ) - continue; else return; } - set_num_error( "Bad header at pos ", pos - member_size ); - break; + { if( skip_trailing_data( infd, pos, cl_opts ) ) continue; return; } + set_num_error( "Bad header at pos ", pos - member_size ); break; } - pos -= member_size; + const unsigned long long data_size = trailer.data_size(); + if( !cl_opts.ignore_empty && data_size == 0 ) + { error_ = empty_msg; retval_ = 2; break; } + pos -= member_size; // good member const unsigned dictionary_size = header.dictionary_size(); - member_vector.push_back( Member( 0, trailer.data_size(), pos, - member_size, dictionary_size ) ); if( dictionary_size_ < dictionary_size ) dictionary_size_ = dictionary_size; + member_vector.push_back( Member( 0, data_size, pos, member_size, + dictionary_size ) ); } - if( pos != 0 || member_vector.empty() ) + if( pos != 0 || member_vector.empty() || retval_ != 0 ) { member_vector.clear(); if( retval_ == 0 ) { error_ = "Can't create file index."; retval_ = 2; } |