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-rw-r--r--repair.cc114
1 files changed, 114 insertions, 0 deletions
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+/* Lziprecover - Data recovery tool for lzipped files
+ Copyright (C) 2009, 2010, 2011 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 <sys/stat.h>
+
+#include "lzip.h"
+
+
+int repair_file( const std::string & input_filename,
+ const std::string & output_filename, 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 < 36 )
+ { show_error( "Input file is too short." ); return 2; }
+ if( !verify_single_member( infd, isize ) ) 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; --pos )
+ {
+ if( verbosity >= 1 )
+ {
+ std::printf( "Trying position %lld \r", pos );
+ std::fflush( stdout );
+ }
+ uint8_t byte;
+ if( lseek( outfd, pos, SEEK_SET ) < 0 ||
+ readblock( outfd, &byte, 1 ) != 1 )
+ { show_error( "Error reading output file", errno );
+ cleanup_and_fail( output_filename, outfd, 1 ); }
+ for( int i = 0; i < 255; ++i )
+ {
+ ++byte;
+ if( lseek( outfd, pos, SEEK_SET ) < 0 ||
+ writeblock( outfd, &byte, 1 ) != 1 ||
+ lseek( outfd, 0, SEEK_SET ) < 0 )
+ { show_error( "Error writing output file", errno );
+ cleanup_and_fail( output_filename, outfd, 1 ); }
+ if( try_decompress( outfd, isize ) )
+ { done = true; break; }
+ }
+ if( done ) break;
+ ++byte;
+ if( lseek( outfd, pos, SEEK_SET ) < 0 ||
+ writeblock( outfd, &byte, 1 ) != 1 )
+ { show_error( "Error writing output file", errno );
+ cleanup_and_fail( output_filename, outfd, 1 ); }
+ }
+ 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;
+ }