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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 14:23:32 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 14:23:32 +0000 |
commit | 74b9339658d8ea3690d32c237223e5974b601ed9 (patch) | |
tree | 98c0d79abbdcf18b8509c29bacee7e75314732e9 /lzip_index.h | |
parent | Initial commit. (diff) | |
download | lzip-74b9339658d8ea3690d32c237223e5974b601ed9.tar.xz lzip-74b9339658d8ea3690d32c237223e5974b601ed9.zip |
Adding upstream version 1.23.upstream/1.23upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | lzip_index.h | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/lzip_index.h b/lzip_index.h new file mode 100644 index 0000000..442512d --- /dev/null +++ b/lzip_index.h @@ -0,0 +1,91 @@ +/* Lzip - LZMA lossless data compressor + Copyright (C) 2008-2022 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/>. +*/ + +#ifndef INT64_MAX +#define INT64_MAX 0x7FFFFFFFFFFFFFFFLL +#endif + + +class Block + { + long long pos_, size_; // pos + size <= INT64_MAX + +public: + Block( const long long p, const long long s ) : pos_( p ), size_( s ) {} + + long long pos() const { return pos_; } + long long size() const { return size_; } + long long end() const { return pos_ + size_; } + + void pos( const long long p ) { pos_ = p; } + void size( const long long s ) { size_ = s; } + }; + + +class Lzip_index + { + struct Member + { + Block dblock, mblock; // data block, member block + unsigned dictionary_size; + + Member( const long long dp, const long long ds, + const long long mp, const long long ms, const unsigned dict_size ) + : dblock( dp, ds ), mblock( mp, ms ), dictionary_size( dict_size ) {} + }; + + std::vector< Member > member_vector; + std::string error_; + const long long insize; + int retval_; + unsigned dictionary_size_; // largest dictionary size in the file + + bool check_header_error( const Lzip_header & header ); + void set_errno_error( const char * const msg ); + void set_num_error( const char * const msg, unsigned long long num ); + bool read_header( const int fd, Lzip_header & header, const long long pos ); + bool skip_trailing_data( const int fd, unsigned long long & pos, + const bool ignore_trailing, const bool loose_trailing ); + +public: + Lzip_index( const int infd, const bool ignore_trailing, + const bool loose_trailing ); + + long members() const { return member_vector.size(); } + const std::string & error() const { return error_; } + int retval() const { return retval_; } + unsigned dictionary_size() const { return dictionary_size_; } + + long long udata_size() const + { if( member_vector.empty() ) return 0; + return member_vector.back().dblock.end(); } + + long long cdata_size() const + { if( member_vector.empty() ) return 0; + return member_vector.back().mblock.end(); } + + // total size including trailing data (if any) + long long file_size() const + { if( insize >= 0 ) return insize; else return 0; } + + const Block & dblock( const long i ) const + { return member_vector[i].dblock; } + const Block & mblock( const long i ) const + { return member_vector[i].mblock; } + unsigned dictionary_size( const long i ) const + { return member_vector[i].dictionary_size; } + }; |