127 lines
4 KiB
C++
127 lines
4 KiB
C++
/* Lziprecover - Data recovery tool for lzipped files
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Copyright (C) 2009, 2010, 2011, 2012, 2013 Antonio Diaz Diaz.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#define _FILE_OFFSET_BITS 64
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#include <cerrno>
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#include <climits>
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#include <cstdio>
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#include <cstring>
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#include <string>
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#include <vector>
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#include <stdint.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include "lzip.h"
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int seek_read( const int fd, uint8_t * const buf, const int size,
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const long long pos )
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{
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if( lseek( fd, pos, SEEK_SET ) == pos )
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return readblock( fd, buf, size );
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return 0;
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}
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int seek_write( const int fd, const uint8_t * const buf, const int size,
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const long long pos )
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{
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if( lseek( fd, pos, SEEK_SET ) == pos )
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return writeblock( fd, buf, size );
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return 0;
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}
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int repair_file( const std::string & input_filename,
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const std::string & output_filename, const int verbosity,
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const bool force )
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{
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struct stat in_stats;
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const int infd = open_instream( input_filename, &in_stats, true, true );
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if( infd < 0 ) return 1;
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const long long isize = lseek( infd, 0, SEEK_END );
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if( isize < 0 )
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{ show_error( "Input file is not seekable", errno ); return 1; }
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if( isize < min_member_size )
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{ show_error( "Input file is too short." ); return 2; }
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if( !verify_single_member( infd, isize, verbosity ) ) return 2;
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if( lseek( infd, 0, SEEK_SET ) < 0 )
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{ show_error( "Seek error in input file", errno ); return 1; }
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long long failure_pos = 0;
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if( try_decompress( infd, isize, &failure_pos ) )
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{
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if( verbosity >= 1 )
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std::printf( "Input file has no errors. Recovery is not needed.\n" );
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return 0;
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}
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if( failure_pos >= isize - 8 ) failure_pos = isize - 8 - 1;
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if( failure_pos < File_header::size )
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{ show_error( "Can't repair error in input file." ); return 2; }
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if( lseek( infd, 0, SEEK_SET ) < 0 )
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{ show_error( "Seek error in input file", errno ); return 1; }
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const int outfd = open_outstream_rw( output_filename, force );
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if( outfd < 0 ) { close( infd ); return 1; }
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if( !copy_file( infd, outfd ) )
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cleanup_and_fail( output_filename, outfd, 1 );
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const long long min_pos =
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std::max( (long long)File_header::size, failure_pos - 1000 );
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bool done = false;
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for( long long pos = failure_pos; pos >= min_pos && !done ; --pos )
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{
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if( verbosity >= 1 )
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{
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std::printf( "Trying position %llu \r", pos );
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std::fflush( stdout );
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}
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uint8_t byte;
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if( seek_read( outfd, &byte, 1, pos ) != 1 )
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{ show_error( "Error reading output file", errno );
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cleanup_and_fail( output_filename, outfd, 1 ); }
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for( int i = 0; i < 256; ++i )
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{
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++byte;
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if( seek_write( outfd, &byte, 1, pos ) != 1 ||
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lseek( outfd, 0, SEEK_SET ) < 0 )
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{ show_error( "Error writing output file", errno );
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cleanup_and_fail( output_filename, outfd, 1 ); }
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if( i == 255 ) break;
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if( try_decompress( outfd, isize ) )
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{ done = true; break; }
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}
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}
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if( verbosity >= 1 ) std::printf( "\n" );
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if( close( outfd ) != 0 )
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{
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show_error( "Error closing output file", errno );
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cleanup_and_fail( output_filename, -1, 1 );
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}
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if( !done )
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{
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show_error( "Error is larger than 1 byte. Can't repair input file." );
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cleanup_and_fail( output_filename, -1, 2 );
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}
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if( verbosity >= 1 )
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std::printf( "Copy of input file repaired successfully.\n" );
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return 0;
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}
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