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/* Lziprecover - Data recovery tool for lzip files
Copyright (C) 2009, 2010, 2011, 2012, 2013, 2014 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 3 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; }
bool operator==( const Block & b ) const
{ return pos_ == b.pos_ && size_ == b.size_; }
bool operator!=( const Block & b ) const
{ return pos_ != b.pos_ || size_ != b.size_; }
bool operator<( const Block & b ) const { return pos_ < b.pos_; }
bool overlaps( const Block & b ) const
{ return ( pos_ < b.end() && b.pos_ < end() ); }
void shift( Block & b ) { ++size_; ++b.pos_; --b.size_; }
Block split( const long long pos );
};
class File_index
{
struct Member
{
Block dblock, mblock; // data block, member block
Member( const long long dp, const long long ds,
const long long mp, const long long ms )
: dblock( dp, ds ), mblock( mp, ms ) {}
bool operator==( const Member & m ) const { return ( mblock == m.mblock ); }
bool operator!=( const Member & m ) const { return ( mblock != m.mblock ); }
};
std::vector< Member > member_vector;
std::string error_;
long long isize;
int retval_;
void set_errno_error( const char * const msg );
void set_num_error( const char * const msg1, unsigned long long num,
const char * const msg2 = "." );
public:
File_index() : error_( "No index." ), isize( 0 ), retval_( 2 ) {}
explicit File_index( const int infd );
File_index( const std::vector< int > & infd_vector, const long long fsize );
int members() const { return member_vector.size(); }
const std::string & error() const { return error_; }
int retval() const { return retval_; }
bool operator==( const File_index & fi ) const
{
if( retval_ || fi.retval_ || isize != fi.isize ||
member_vector.size() != fi.member_vector.size() ) return false;
for( unsigned i = 0; i < member_vector.size(); ++i )
if( member_vector[i] != fi.member_vector[i] ) return false;
return true;
}
bool operator!=( const File_index & fi ) const { return !( *this == fi ); }
long long data_end() const
{ if( member_vector.size() ) return member_vector.back().dblock.end();
else return 0; }
long long file_end() const
{ if( member_vector.size() ) return member_vector.back().mblock.end();
else return 0; }
// total size including trailing garbage (if any)
long long file_size() const
{ if( isize >= 0 ) return isize; else return 0; }
const Block & dblock( const int i ) const
{ return member_vector[i].dblock; }
const Block & mblock( const int i ) const
{ return member_vector[i].mblock; }
};
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