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+/* Tarlz - Archiver with multimember lzip compression
+ Copyright (C) 2013-2022 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 bad_magic_; // bad magic in first header
+
+ bool check_header_error( const Lzip_header & header, const bool first );
+ 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_; }
+ bool bad_magic() const { return bad_magic_; }
+
+ 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; }
+ };