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lziprecover/lunzcrash.cc
Daniel Baumann 796a69d402
Merging upstream version 1.23. 
Signed-off-by: Daniel Baumann <daniel@debian.org>
2025-02-21 11:31:40 +01:00

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/* Lziprecover - Data recovery tool for the lzip format
Copyright (C) 2009-2022 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 <climits>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <string>
#include <vector>
#include <stdint.h>
#include <unistd.h>
#include <sys/stat.h>
#include "lzip.h"
#include "md5.h"
#include "mtester.h"
#include "lzip_index.h"
namespace {
bool verify_member( const uint8_t * const mbuffer, const long long msize,
const unsigned dictionary_size, const char * const name,
uint8_t digest[16] )
{
MD5SUM md5sum;
LZ_mtester mtester( mbuffer, msize, dictionary_size, -1, &md5sum );
if( mtester.test_member() != 0 || !mtester.finished() )
{ show_file_error( name, "Error verifying input file." ); return false; }
md5sum.md5_finish( digest );
return true;
}
bool compare_member( const uint8_t * const mbuffer, const long long msize,
const unsigned dictionary_size,
const long long byte_pos, const uint8_t digest[16] )
{
MD5SUM md5sum;
LZ_mtester mtester( mbuffer, msize, dictionary_size, -1, &md5sum );
bool error = ( mtester.test_member() != 0 || !mtester.finished() );
if( !error )
{
uint8_t new_digest[16];
md5sum.md5_finish( new_digest );
if( std::memcmp( digest, new_digest, 16 ) != 0 ) error = true;
}
if( error && verbosity >= 0 )
std::printf( "byte %llu comparison failed\n", byte_pos );
return !error;
}
int test_member_rest( const LZ_mtester & master, uint8_t * const buffer2,
long * const failure_posp,
const unsigned long long byte_pos )
{
LZ_mtester mtester( master ); // tester with external buffer
mtester.duplicate_buffer( buffer2 );
int result = mtester.test_member( LLONG_MAX, LLONG_MAX, stdout, byte_pos );
if( result == 0 && !mtester.finished() ) result = -1; // false negative
if( result != 0 ) *failure_posp = mtester.member_position();
return result;
}
long next_pct_pos( const Lzip_index & lzip_index, const int i, const int pct,
const int sector_size = 0 )
{
if( pct <= 0 ) return 0;
const long long cdata_size = lzip_index.cdata_size() - sector_size;
const long long mpos = lzip_index.mblock( i ).pos();
const long long msize = lzip_index.mblock( i ).size() - sector_size;
long long pct_pos = (long long)( cdata_size / ( 100.0 / pct ) );
if( pct_pos <= mpos ) pct_pos = 0;
else if( pct_pos == cdata_size ) pct_pos = msize - 21; // 100%
else if( pct_pos >= mpos + msize ) pct_pos = msize;
else pct_pos -= mpos;
return pct_pos;
}
} // end namespace
/* Test 1-bit errors in LZMA streams in file.
Unless verbosity >= 1, print only the bytes with interesting results. */
int lunzcrash_bit( const char * const input_filename )
{
struct stat in_stats; // not used
const int infd = open_instream( input_filename, &in_stats, false, true );
if( infd < 0 ) return 1;
const Lzip_index lzip_index( infd, true, true );
if( lzip_index.retval() != 0 )
{ show_file_error( input_filename, lzip_index.error().c_str() );
return lzip_index.retval(); }
if( verbosity >= 2 ) printf( "Testing file '%s'\n", input_filename );
const long long cdata_size = lzip_index.cdata_size();
long positions = 0, decompressions = 0, successes = 0, failed_comparisons = 0;
int pct = ( cdata_size >= 1000 && isatty( STDERR_FILENO ) ) ? 0 : 100;
for( long i = 0; i < lzip_index.members(); ++i )
{
const long long mpos = lzip_index.mblock( i ).pos();
const long long msize = lzip_index.mblock( i ).size();
const unsigned dictionary_size = lzip_index.dictionary_size( i );
uint8_t * const mbuffer = read_member( infd, mpos, msize );
if( !mbuffer ) return 1;
uint8_t md5_orig[16];
if( !verify_member( mbuffer, msize, dictionary_size, input_filename,
md5_orig ) ) return 2;
long pct_pos = next_pct_pos( lzip_index, i, pct );
long pos = Lzip_header::size + 1, printed = 0; // last pos printed
const long end = msize - 20;
if( verbosity == 0 ) // give a clue of the range being tested
std::printf( "Testing bytes %llu to %llu\n", mpos + pos, mpos + end - 1 );
LZ_mtester master( mbuffer, msize, dictionary_size );
uint8_t * const buffer2 = new uint8_t[dictionary_size];
for( ; pos < end; ++pos )
{
const long pos_limit = pos - 16;
if( pos_limit > 0 && master.test_member( pos_limit ) != -1 )
{ show_error( "Can't advance master." ); return 1; }
if( verbosity >= 0 && pos >= pct_pos )
{ std::fprintf( stderr, "\r%3u%% done\r", pct ); ++pct;
pct_pos = next_pct_pos( lzip_index, i, pct ); }
if( verbosity >= 1 )
{ std::printf( "byte %llu\n", mpos + pos ); printed = pos; }
++positions;
const uint8_t byte = mbuffer[pos];
for( uint8_t mask = 1; mask != 0; mask <<= 1 )
{
++decompressions;
mbuffer[pos] ^= mask;
long failure_pos = 0;
const int result = test_member_rest( master, buffer2, &failure_pos,
( printed < pos ) ? mpos + pos : 0 );
if( result <= 0 )
{
++successes;
if( verbosity >= 0 )
{
if( printed < pos )
{ std::printf( "byte %llu\n", mpos + pos ); printed = pos; }
std::printf( "0x%02X (0x%02X^0x%02X) passed the test%s",
mbuffer[pos], byte, mask, ( result < 0 ) ? "" : "\n" );
if( result < 0 )
std::printf( ", but only consumed %lu bytes of %llu\n",
failure_pos, msize );
}
if( !compare_member( mbuffer, msize, dictionary_size, mpos + pos,
md5_orig ) ) ++failed_comparisons;
}
else if( result == 1 )
{
if( verbosity >= 2 ||
( verbosity >= 1 && failure_pos - pos >= 10000 ) ||
( verbosity >= 0 && failure_pos - pos >= 50000 ) )
{
if( printed < pos )
{ std::printf( "byte %llu\n", mpos + pos ); printed = pos; }
std::printf( "Decoder error at pos %llu\n", mpos + failure_pos );
}
}
else if( result == 3 || result == 4 ) // test_member printed the error
{ if( verbosity >= 0 && printed < pos ) printed = pos; }
else if( verbosity >= 0 )
{
if( printed < pos )
{ std::printf( "byte %llu\n", mpos + pos ); printed = pos; }
if( result == 2 )
std::printf( "File ends unexpectedly at pos %llu\n",
mpos + failure_pos );
else
std::printf( "Unknown error code '%d'\n", result );
}
mbuffer[pos] ^= mask;
}
}
delete[] buffer2;
if( !compare_member( mbuffer, msize, dictionary_size, mpos + pos, md5_orig ) )
internal_error( "Some byte was not properly restored." );
delete[] mbuffer;
}
if( verbosity >= 0 )
{
std::printf( "\n%9ld bytes tested\n%9ld total decompressions"
"\n%9ld decompressions returned with zero status",
positions, decompressions, successes );
if( successes > 0 )
{
if( failed_comparisons > 0 )
std::printf( ", of which\n%9ld comparisons failed\n",
failed_comparisons );
else std::fputs( "\n all comparisons passed\n", stdout );
}
else std::fputc( '\n', stdout );
}
return 0;
}
/* Test zeroed blocks of given size in LZMA streams in file.
Unless verbosity >= 1, print only the bytes with interesting results. */
int lunzcrash_block( const char * const input_filename, const int sector_size )
{
struct stat in_stats; // not used
const int infd = open_instream( input_filename, &in_stats, false, true );
if( infd < 0 ) return 1;
const Lzip_index lzip_index( infd, true, true );
if( lzip_index.retval() != 0 )
{ show_file_error( input_filename, lzip_index.error().c_str() );
return lzip_index.retval(); }
if( verbosity >= 2 ) printf( "Testing file '%s'\n", input_filename );
const long long cdata_size = lzip_index.cdata_size();
long decompressions = 0, successes = 0, failed_comparisons = 0;
int pct = ( cdata_size >= 1000 && isatty( STDERR_FILENO ) ) ? 0 : 100;
uint8_t * const block = new uint8_t[sector_size];
for( long i = 0; i < lzip_index.members(); ++i )
{
const long long mpos = lzip_index.mblock( i ).pos();
const long long msize = lzip_index.mblock( i ).size();
long pos = Lzip_header::size + 1;
const long end = msize - sector_size - 20;
if( end <= pos ) continue; // sector_size larger than LZMA stream
const unsigned dictionary_size = lzip_index.dictionary_size( i );
uint8_t * const mbuffer = read_member( infd, mpos, msize );
if( !mbuffer ) return 1;
uint8_t md5_orig[16];
if( !verify_member( mbuffer, msize, dictionary_size, input_filename,
md5_orig ) ) return 2;
long pct_pos = next_pct_pos( lzip_index, i, pct, sector_size );
if( verbosity >= 0 ) // give a clue of the range being tested
std::printf( "Testing blocks of size %u from pos %llu to %llu\n",
sector_size, mpos + pos, mpos + end - 1 );
LZ_mtester master( mbuffer, msize, dictionary_size );
uint8_t * const buffer2 = new uint8_t[dictionary_size];
for( ; pos < end; ++pos )
{
const long pos_limit = pos - 16;
if( pos_limit > 0 && master.test_member( pos_limit ) != -1 )
{ show_error( "Can't advance master." ); return 1; }
if( verbosity >= 0 && pos >= pct_pos )
{ std::fprintf( stderr, "\r%3u%% done\r", pct ); ++pct;
pct_pos = next_pct_pos( lzip_index, i, pct, sector_size ); }
std::memcpy( block, mbuffer + pos, sector_size ); // save block
std::memset( mbuffer + pos, 0, sector_size );
++decompressions;
long failure_pos = 0;
const int result =
test_member_rest( master, buffer2, &failure_pos, mpos + pos );
if( result <= 0 )
{
++successes;
if( verbosity >= 0 )
{
std::printf( "block %llu,%u passed the test%s",
mpos + pos, sector_size, ( result < 0 ) ? "" : "\n" );
if( result < 0 )
std::printf( ", but only consumed %lu bytes of %llu\n",
failure_pos, msize );
}
if( !compare_member( mbuffer, msize, dictionary_size, mpos + pos,
md5_orig ) ) ++failed_comparisons;
}
else if( result == 1 )
{
if( verbosity >= 3 ||
( verbosity >= 2 && failure_pos - pos >= sector_size ) ||
( verbosity >= 1 && failure_pos - pos >= 10000 ) ||
( verbosity >= 0 && failure_pos - pos >= 50000 ) )
std::printf( "block %llu,%u\nDecoder error at pos %llu\n",
mpos + pos, sector_size, mpos + failure_pos );
}
else if( result == 3 || result == 4 ) // test_member printed the error
{}
else if( verbosity >= 0 )
{
std::printf( "block %llu,%u\n", mpos + pos, sector_size );
if( result == 2 )
std::printf( "File ends unexpectedly at pos %llu\n",
mpos + failure_pos );
else
std::printf( "Unknown error code '%d'\n", result );
}
std::memcpy( mbuffer + pos, block, sector_size ); // restore block
}
delete[] buffer2;
if( !compare_member( mbuffer, msize, dictionary_size, mpos + pos, md5_orig ) )
internal_error( "Block was not properly restored." );
delete[] mbuffer;
}
delete[] block;
if( verbosity >= 0 )
{
std::printf( "\n%9ld blocks tested\n%9ld total decompressions"
"\n%9ld decompressions returned with zero status",
decompressions, decompressions, successes );
if( successes > 0 )
{
if( failed_comparisons > 0 )
std::printf( ", of which\n%9ld comparisons failed\n",
failed_comparisons );
else std::fputs( "\n all comparisons passed\n", stdout );
}
else std::fputc( '\n', stdout );
}
return 0;
}
int md5sum_files( const std::vector< std::string > & filenames )
{
int retval = 0;
bool stdin_used = false;
for( unsigned i = 0; i < filenames.size(); ++i )
{
const bool from_stdin = ( filenames[i] == "-" );
if( from_stdin ) { if( stdin_used ) continue; else stdin_used = true; }
const char * const input_filename = filenames[i].c_str();
struct stat in_stats; // not used
const int infd = from_stdin ? STDIN_FILENO :
open_instream( input_filename, &in_stats, false );
if( infd < 0 ) { set_retval( retval, 1 ); continue; }
enum { buffer_size = 16384 };
uint8_t buffer[buffer_size], md5_digest[16];
MD5SUM md5sum;
while( true )
{
const int len = readblock( infd, buffer, buffer_size );
if( len != buffer_size && errno ) throw Error( "Read error" );
if( len > 0 ) md5sum.md5_update( buffer, len );
if( len < buffer_size ) break;
}
md5sum.md5_finish( md5_digest );
if( close( infd ) != 0 )
{ show_file_error( input_filename, "Error closing input file", errno );
return 1; }
for( int i = 0; i < 16; ++i ) std::printf( "%02x", md5_digest[i] );
std::printf( " %s\n", input_filename );
std::fflush( stdout );
}
return retval;
}
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