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/* Lziprecover - Data recovery tool for the lzip format
Copyright (C) 2009-2021 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 <new>
#include <string>
#include <vector>
#include <stdint.h>
#include <unistd.h>
#include "lzip.h"
#include "mtester.h"
namespace {
/* Returns the address of a malloc'd buffer containing the file data and
the file size in '*size'. The buffer is at least 20 bytes larger.
In case of error, returns 0 and does not modify '*size'.
*/
uint8_t * read_file( const int infd, long * const size,
const char * const filename )
{
long buffer_size = 1 << 20;
uint8_t * buffer = (uint8_t *)std::malloc( buffer_size );
if( !buffer ) throw std::bad_alloc();
long file_size = readblock( infd, buffer, buffer_size - 20 );
while( file_size >= buffer_size - 20 && !errno )
{
if( buffer_size >= LONG_MAX )
{ show_file_error( filename, "File is too large" ); std::free( buffer );
return 0; }
buffer_size = ( buffer_size <= LONG_MAX / 2 ) ? 2 * buffer_size : LONG_MAX;
uint8_t * const tmp = (uint8_t *)std::realloc( buffer, buffer_size );
if( !tmp ) { std::free( buffer ); throw std::bad_alloc(); }
buffer = tmp;
file_size +=
readblock( infd, buffer + file_size, buffer_size - 20 - file_size );
}
if( errno )
{
show_file_error( filename, "Error reading file", errno );
std::free( buffer ); return 0;
}
*size = file_size;
return buffer;
}
bool validate_ds( unsigned * const dictionary_size )
{
if( *dictionary_size < min_dictionary_size )
{ *dictionary_size = min_dictionary_size; return false; }
if( *dictionary_size > max_dictionary_size )
{ *dictionary_size = max_dictionary_size; return false; }
return true;
}
} // end namespace
int alone_to_lz( const int infd, const Pretty_print & pp )
{
enum { lzma_header_size = 13, offset = lzma_header_size - Lzip_header::size };
long file_size = 0;
uint8_t * const buffer = read_file( infd, &file_size, pp.name() );
if( !buffer ) return 1;
if( file_size < lzma_header_size )
{ show_file_error( pp.name(), "file is too short" );
std::free( buffer ); return 2; }
if( buffer[0] != 93 ) // (45 * 2) + (9 * 0) + 3
{
const Lzip_header & header = *(const Lzip_header *)buffer;
if( header.verify_magic() && header.verify_version() &&
isvalid_ds( header.dictionary_size() ) )
show_file_error( pp.name(), "file is already in lzip format" );
else
show_file_error( pp.name(), "file has non-default LZMA properties" );
std::free( buffer ); return 2;
}
for( int i = 5; i < 13; ++i ) if( buffer[i] != 0xFF )
{ show_file_error( pp.name(), "file is non-streamed" );
std::free( buffer ); return 2; }
if( verbosity >= 1 ) pp();
unsigned dictionary_size = 0;
for( int i = 4; i > 0; --i )
{ dictionary_size <<= 8; dictionary_size += buffer[i]; }
const unsigned orig_dictionary_size = dictionary_size;
validate_ds( &dictionary_size );
Lzip_header & header = *(Lzip_header *)( buffer + offset );
header.set_magic();
header.dictionary_size( dictionary_size );
for( int i = 0; i < Lzip_trailer::size; ++i ) buffer[file_size++] = 0;
{
LZ_mtester mtester( buffer + offset, file_size - offset, dictionary_size );
const int result = mtester.test_member();
if( result == 1 && orig_dictionary_size > max_dictionary_size )
{ pp( "dictionary size is too large" ); std::free( buffer ); return 2; }
if( result != 3 || !mtester.finished() )
{ pp( "file is corrupt" ); std::free( buffer ); return 2; }
if( mtester.max_distance() < dictionary_size &&
dictionary_size > min_dictionary_size )
{
dictionary_size =
std::max( mtester.max_distance(), (unsigned)min_dictionary_size );
header.dictionary_size( dictionary_size );
}
Lzip_trailer & trailer =
*(Lzip_trailer *)( buffer + file_size - Lzip_trailer::size );
trailer.data_crc( mtester.crc() );
trailer.data_size( mtester.data_position() );
trailer.member_size( mtester.member_position() );
}
LZ_mtester mtester( buffer + offset, file_size - offset, dictionary_size );
if( mtester.test_member() != 0 || !mtester.finished() )
{ pp( "conversion failed" ); std::free( buffer ); return 2; }
if( writeblock( outfd, buffer + offset, file_size - offset ) != file_size - offset )
{
show_error( "Error writing output file", errno );
std::free( buffer ); return 1;
}
std::free( buffer );
if( verbosity >= 1 ) std::fputs( "done\n", stderr );
return 0;
}
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