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/* Lziprecover - Data recovery tool
Copyright (C) 2009-2026 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 <cstdlib>
#include <cstring>
#include <string>
#include <vector>
#include <stdint.h>
#include <unistd.h>
#include <sys/stat.h>
#include "lzip.h"
#include "decoder.h"
#include "lzip_index.h"
namespace {
bool decompress_member( const int infd, const Cl_options & cl_opts,
const Pretty_print & pp, const unsigned long long mpos,
const unsigned long long outskip, const unsigned long long outend )
{
Range_decoder rdec( infd );
Lzip_header header;
rdec.read_data( header.data, header.size );
if( rdec.finished() ) // End Of File
{ pp( "File ends unexpectedly at member header." ); return false; }
if( !header.check_magic() ) { pp( bad_magic_msg ); return false; }
if( !header.check_version() )
{ pp( bad_version( header.version() ) ); return false; }
const unsigned dictionary_size = header.dictionary_size();
if( !isvalid_ds( dictionary_size ) ) { pp( bad_dict_msg ); return false; }
if( verbosity >= 2 ) pp();
LZ_decoder decoder( rdec, dictionary_size, outfd, outskip, outend );
const int result = decoder.decode_member( pp, cl_opts.ignore_errors );
if( result != 0 )
{
if( verbosity >= 0 && result <= 2 )
{
pp();
std::fprintf( stderr, "%s at pos %s\n", ( result == 2 ) ?
"File ends unexpectedly" : "Decoder error",
format_num3( mpos + rdec.member_position() ) );
}
return false;
}
if( decoder.data_position() < outend - outskip )
{
if( verbosity >= 0 )
{ pp(); std::fprintf( stderr,
"%sMember at pos %s contains only %s bytes of %s requested.\n",
( verbosity >= 2 ) ? "\n" : "", format_num3( mpos ),
format_num3( decoder.data_position() - outskip ),
format_num3( outend - outskip ) ); }
return false;
}
if( verbosity >= 2 ) std::fputs( "done\n", stderr );
return true;
}
} // end namespace
int range_decompress( const std::string & input_filename,
const std::string & default_output_filename,
const Cl_options & cl_opts, Block range,
const bool force, const bool to_stdout )
{
const char * const filename = input_filename.c_str();
struct stat in_stats;
const int infd = open_instream( filename, &in_stats, false, true );
if( infd < 0 ) return 1;
const Lzip_index lzip_index( infd, cl_opts, cl_opts.ignore_errors,
cl_opts.ignore_errors );
if( lzip_index.retval() != 0 )
{ show_file_error( filename, lzip_index.error().c_str() );
return lzip_index.retval(); }
const long long udata_size = lzip_index.udata_size();
if( range.end() > udata_size )
range.size( std::max( 0LL, udata_size - range.pos() ) );
if( range.size() <= 0 )
{ if( udata_size > 0 )
show_file_error( filename, "Nothing to do; range is empty." );
return 0; }
if( to_stdout || default_output_filename.empty() ) outfd = STDOUT_FILENO;
else
{
output_filename = default_output_filename;
set_signal_handler();
if( !open_outstream( force, true, false, false, true ) ) return 1;
}
if( verbosity >= 1 )
std::fprintf( stderr, "Decompressing range %s to %s (%s of %s bytes)\n",
format_num3( range.pos() ),
format_num3( range.pos() + range.size() ),
format_num3( range.size() ), format_num3( udata_size ) );
Pretty_print pp( input_filename );
bool error = false;
for( long i = 0; i < lzip_index.members(); ++i )
{
const Block & db = lzip_index.dblock( i );
if( range.overlaps( db ) )
{
if( verbosity >= 3 && lzip_index.members() > 1 )
std::fprintf( stderr, "Decompressing member %3s\n", format_num3( i + 1 ) );
const long long outskip = std::max( 0LL, range.pos() - db.pos() );
const long long outend = std::min( db.size(), range.end() - db.pos() );
const long long mpos = lzip_index.mblock( i ).pos();
if( !safe_seek( infd, mpos, input_filename ) ) cleanup_and_fail( 1 );
if( !decompress_member( infd, cl_opts, pp, mpos, outskip, outend ) )
{ if( cl_opts.ignore_errors ) error = true; else cleanup_and_fail( 2 ); }
pp.reset();
}
}
if( close( infd ) != 0 )
{ show_file_error( filename, "Error closing input file", errno );
cleanup_and_fail( 1 ); }
if( !close_outstream( &in_stats ) ) cleanup_and_fail( 1 );
if( verbosity >= 2 && !error )
std::fputs( "Byte range decompressed successfully.\n", stderr );
return 0; // either no error or ignored
}
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