diff options
Diffstat (limited to 'lzip_index.cc')
| -rw-r--r-- | lzip_index.cc | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/lzip_index.cc b/lzip_index.cc new file mode 100644 index 0000000..cb4e9b1 --- /dev/null +++ b/lzip_index.cc @@ -0,0 +1,204 @@ +/* Tarlz - Archiver with multimember lzip compression + Copyright (C) 2013-2019 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 + the Free Software Foundation, either version 2 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/>. +*/ + +#define _FILE_OFFSET_BITS 64 + +#include <algorithm> +#include <cerrno> +#include <cstdio> +#include <cstring> +#include <string> +#include <vector> +#include <stdint.h> +#include <unistd.h> + +#include "lzip.h" +#include "lzip_index.h" + + +namespace { + +int seek_read( const int fd, uint8_t * const buf, const int size, + const long long pos ) + { + if( lseek( fd, pos, SEEK_SET ) == pos ) + return readblock( fd, buf, size ); + return 0; + } + +const char * bad_version( const unsigned version ) + { + static char buf[80]; + snprintf( buf, sizeof buf, "Version %u member format not supported.", + version ); + return buf; + } + +} // end namespace + + +void Lzip_index::set_errno_error( const char * const msg ) + { + error_ = msg; error_ += std::strerror( errno ); + retval_ = 1; + } + +void Lzip_index::set_num_error( const char * const msg, unsigned long long num ) + { + char buf[80]; + snprintf( buf, sizeof buf, "%s%llu", msg, num ); + error_ = buf; + retval_ = 2; + } + + +// If successful, push last member and set pos to member header. +bool Lzip_index::skip_trailing_data( const int fd, long long & pos, + const bool ignore_trailing, const bool loose_trailing ) + { + enum { block_size = 16384, + buffer_size = block_size + Lzip_trailer::size - 1 + Lzip_header::size }; + uint8_t buffer[buffer_size]; + if( pos < min_member_size ) return false; + int bsize = pos % block_size; // total bytes in buffer + if( bsize <= buffer_size - block_size ) bsize += block_size; + int search_size = bsize; // bytes to search for trailer + int rd_size = bsize; // bytes to read from file + unsigned long long ipos = pos - rd_size; // aligned to block_size + + while( true ) + { + if( seek_read( fd, buffer, rd_size, ipos ) != rd_size ) + { set_errno_error( "Error seeking member trailer: " ); return false; } + const uint8_t max_msb = ( ipos + search_size ) >> 56; + for( int i = search_size; i >= Lzip_trailer::size; --i ) + 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 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; + Lzip_header header; + if( seek_read( fd, header.data, Lzip_header::size, + ipos + i - member_size ) != Lzip_header::size ) + { set_errno_error( "Error reading member header: " ); return false; } + const unsigned dictionary_size = header.dictionary_size(); + if( !header.verify_magic() || !header.verify_version() || + !isvalid_ds( dictionary_size ) ) continue; + if( (*(const Lzip_header *)( buffer + i )).verify_prefix( bsize - i ) ) + { error_ = "Last member in input file is truncated or corrupt."; + retval_ = 2; return false; } + if( !loose_trailing && bsize - i >= Lzip_header::size && + (*(const Lzip_header *)( buffer + i )).verify_corrupt() ) + { error_ = corrupt_mm_msg; retval_ = 2; return false; } + if( !ignore_trailing ) + { error_ = trailing_msg; retval_ = 2; return false; } + pos = ipos + i - member_size; + member_vector.push_back( Member( 0, trailer.data_size(), pos, + member_size, dictionary_size ) ); + return true; + } + if( ipos <= 0 ) + { set_num_error( "Bad trailer at pos ", pos - Lzip_trailer::size ); + return false; } + bsize = buffer_size; + search_size = bsize - Lzip_header::size; + rd_size = block_size; + ipos -= rd_size; + std::memcpy( buffer + rd_size, buffer, buffer_size - rd_size ); + } + } + + +Lzip_index::Lzip_index( const int infd, const bool ignore_trailing, + const bool loose_trailing ) + : insize( lseek( infd, 0, SEEK_END ) ), retval_( 0 ) + { + if( insize < 0 ) + { set_errno_error( "Input file is not seekable: " ); return; } + if( insize < min_member_size ) + { error_ = "Input file is too short."; retval_ = 2; return; } + if( insize > INT64_MAX ) + { error_ = "Input file is too long (2^63 bytes or more)."; + retval_ = 2; return; } + + Lzip_header header; + if( seek_read( infd, header.data, Lzip_header::size, 0 ) != Lzip_header::size ) + { set_errno_error( "Error reading member header: " ); return; } + if( !header.verify_magic() ) + { error_ = bad_magic_msg; retval_ = 2; return; } + if( !header.verify_version() ) + { error_ = bad_version( header.version() ); retval_ = 2; return; } + if( !isvalid_ds( header.dictionary_size() ) ) + { error_ = bad_dict_msg; retval_ = 2; return; } + + 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 ) + { set_errno_error( "Error reading member trailer: " ); break; } + const unsigned long long member_size = trailer.member_size(); + if( member_size > (unsigned long long)pos || !trailer.verify_consistency() ) + { + 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( seek_read( infd, header.data, Lzip_header::size, + pos - member_size ) != Lzip_header::size ) + { set_errno_error( "Error reading member header: " ); break; } + const unsigned dictionary_size = header.dictionary_size(); + if( !header.verify_magic() || !header.verify_version() || + !isvalid_ds( dictionary_size ) ) + { + 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; + } + pos -= member_size; + member_vector.push_back( Member( 0, trailer.data_size(), pos, + member_size, dictionary_size ) ); + } + if( pos != 0 || member_vector.empty() ) + { + member_vector.clear(); + if( retval_ == 0 ) { error_ = "Can't create file index."; retval_ = 2; } + return; + } + std::reverse( member_vector.begin(), member_vector.end() ); + for( unsigned long i = 0; ; ++i ) + { + const long long end = member_vector[i].dblock.end(); + if( end < 0 || end > INT64_MAX ) + { + member_vector.clear(); + error_ = "Data in input file is too long (2^63 bytes or more)."; + retval_ = 2; return; + } + if( i + 1 >= member_vector.size() ) break; + member_vector[i+1].dblock.pos( end ); + } + } |