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/* Lziprecover - Data recovery tool for lzipped files
Copyright (C) 2009, 2010, 2011, 2012, 2013 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/>.
*/
#define _FILE_OFFSET_BITS 64
#include <cerrno>
#include <climits>
#include <cstdio>
#include <cstring>
#include <string>
#include <vector>
#include <stdint.h>
#include <unistd.h>
#include <sys/stat.h>
#include "lzip.h"
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;
}
int seek_write( const int fd, const uint8_t * const buf, const int size,
const long long pos )
{
if( lseek( fd, pos, SEEK_SET ) == pos )
return writeblock( fd, buf, size );
return 0;
}
int repair_file( const std::string & input_filename,
const std::string & output_filename, const int verbosity,
const bool force )
{
struct stat in_stats;
const int infd = open_instream( input_filename, &in_stats, true, true );
if( infd < 0 ) return 1;
const long long isize = lseek( infd, 0, SEEK_END );
if( isize < 0 )
{ show_error( "Input file is not seekable", errno ); return 1; }
if( isize < min_member_size )
{ show_error( "Input file is too short." ); return 2; }
if( !verify_single_member( infd, isize, verbosity ) ) return 2;
if( lseek( infd, 0, SEEK_SET ) < 0 )
{ show_error( "Seek error in input file", errno ); return 1; }
long long failure_pos = 0;
if( try_decompress( infd, isize, &failure_pos ) )
{
if( verbosity >= 1 )
std::printf( "Input file has no errors. Recovery is not needed.\n" );
return 0;
}
if( failure_pos >= isize - 8 ) failure_pos = isize - 8 - 1;
if( failure_pos < File_header::size )
{ show_error( "Can't repair error in input file." ); return 2; }
if( lseek( infd, 0, SEEK_SET ) < 0 )
{ show_error( "Seek error in input file", errno ); return 1; }
const int outfd = open_outstream_rw( output_filename, force );
if( outfd < 0 ) { close( infd ); return 1; }
if( !copy_file( infd, outfd ) )
cleanup_and_fail( output_filename, outfd, 1 );
const long long min_pos =
std::max( (long long)File_header::size, failure_pos - 1000 );
bool done = false;
for( long long pos = failure_pos; pos >= min_pos && !done ; --pos )
{
if( verbosity >= 1 )
{
std::printf( "Trying position %llu \r", pos );
std::fflush( stdout );
}
uint8_t byte;
if( seek_read( outfd, &byte, 1, pos ) != 1 )
{ show_error( "Error reading output file", errno );
cleanup_and_fail( output_filename, outfd, 1 ); }
for( int i = 0; i < 256; ++i )
{
++byte;
if( seek_write( outfd, &byte, 1, pos ) != 1 ||
lseek( outfd, 0, SEEK_SET ) < 0 )
{ show_error( "Error writing output file", errno );
cleanup_and_fail( output_filename, outfd, 1 ); }
if( i == 255 ) break;
if( try_decompress( outfd, isize ) )
{ done = true; break; }
}
}
if( verbosity >= 1 ) std::printf( "\n" );
if( close( outfd ) != 0 )
{
show_error( "Error closing output file", errno );
cleanup_and_fail( output_filename, -1, 1 );
}
if( !done )
{
show_error( "Error is larger than 1 byte. Can't repair input file." );
cleanup_and_fail( output_filename, -1, 2 );
}
if( verbosity >= 1 )
std::printf( "Copy of input file repaired successfully.\n" );
return 0;
}
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