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/* Lziprecover - Data recovery tool for the lzip format
Copyright (C) 2009-2019 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 <cstdio>
#include <cstdlib>
#include <cstring>
#include <string>
#include <vector>
#include <stdint.h>
#include <unistd.h>
#include <sys/stat.h>
#include "lzip.h"
#include "decoder.h"
#include "lzip_index.h"
namespace {
int decompress_member( const int infd, const Pretty_print & pp,
const unsigned long long mpos,
const unsigned long long outskip,
const unsigned long long outend )
{
Range_decoder rdec( infd );
Lzip_header header;
rdec.read_data( header.data, Lzip_header::size );
if( rdec.finished() ) // End Of File
{ pp( "File ends unexpectedly at member header." ); return 2; }
if( !header.verify_magic() ) { pp( bad_magic_msg ); return 2; }
if( !header.verify_version() )
{ pp( bad_version( header.version() ) ); return 2; }
const unsigned dictionary_size = header.dictionary_size();
if( !isvalid_ds( dictionary_size ) ) { pp( bad_dict_msg ); return 2; }
if( verbosity >= 2 ) pp();
LZ_decoder decoder( rdec, dictionary_size, outfd, outskip, outend );
const int result = decoder.decode_member( pp );
if( result != 0 )
{
if( verbosity >= 0 && result <= 2 )
{
pp();
std::fprintf( stderr, "%s at pos %llu\n", ( result == 2 ) ?
"File ends unexpectedly" : "Decoder error",
mpos + rdec.member_position() );
}
return 2;
}
if( verbosity >= 2 ) std::fputs( "done\n", stderr );
return 0;
}
const char * format_num( unsigned long long num,
unsigned long long limit = -1ULL,
const int set_prefix = 0 )
{
const char * const si_prefix[8] =
{ "k", "M", "G", "T", "P", "E", "Z", "Y" };
const char * const binary_prefix[8] =
{ "Ki", "Mi", "Gi", "Ti", "Pi", "Ei", "Zi", "Yi" };
enum { buffers = 8, bufsize = 32 };
static char buffer[buffers][bufsize]; // circle of static buffers for printf
static int current = 0;
static bool si = true;
if( set_prefix ) si = ( set_prefix > 0 );
const unsigned factor = ( si ? 1000 : 1024 );
char * const buf = buffer[current++]; current %= buffers;
const char * const * prefix = ( si ? si_prefix : binary_prefix );
const char * p = "";
bool exact = ( num % factor == 0 );
for( int i = 0; i < 8 && ( num > limit || ( exact && num >= factor ) ); ++i )
{ num /= factor; if( num % factor != 0 ) exact = false; p = prefix[i]; }
snprintf( buf, bufsize, "%llu %s", num, p );
return buf;
}
} // end namespace
bool safe_seek( const int fd, const long long pos )
{
if( lseek( fd, pos, SEEK_SET ) == pos ) return true;
show_error( "Seek error", errno ); return false;
}
int range_decompress( const std::string & input_filename,
const std::string & default_output_filename,
Block range, const bool force, const bool ignore_errors,
const bool ignore_trailing, const bool loose_trailing,
const bool to_stdout )
{
struct stat in_stats;
const int infd = open_instream( input_filename.c_str(), &in_stats, true, true );
if( infd < 0 ) return 1;
const Lzip_index lzip_index( infd, ignore_trailing, loose_trailing,
ignore_errors, ignore_errors );
if( lzip_index.retval() != 0 )
{ show_file_error( input_filename.c_str(), lzip_index.error().c_str() );
return lzip_index.retval(); }
if( range.end() > lzip_index.udata_size() )
range.size( std::max( 0LL, lzip_index.udata_size() - range.pos() ) );
if( range.size() <= 0 )
{ show_file_error( input_filename.c_str(), "Nothing to do." ); return 0; }
if( to_stdout || default_output_filename.empty() )
outfd = STDOUT_FILENO;
else
{
output_filename = default_output_filename;
set_signal_handler();
if( !open_outstream( force, false, false, false ) )
{ close( infd ); return 1; }
}
if( verbosity >= 1 )
std::fprintf( stderr, "Decompressing range %sB to %sB (%sof %sBytes)\n",
format_num( range.pos() ),
format_num( range.pos() + range.size() ),
format_num( range.size() ),
format_num( lzip_index.udata_size() ) );
Pretty_print pp( input_filename );
int retval = 0;
for( long i = 0; i < lzip_index.members(); ++i )
{
const Block & db = lzip_index.dblock( i );
if( range.overlaps( db ) )
{
if( verbosity >= 3 && lzip_index.members() > 1 )
std::fprintf( stderr, "Decompressing member %3ld\n", i + 1 );
const long long outskip = std::max( 0LL, range.pos() - db.pos() );
const long long outend = std::min( db.size(), range.end() - db.pos() );
const long long mpos = lzip_index.mblock( i ).pos();
if( !safe_seek( infd, mpos ) ) { retval = 1; break; }
const int tmp = decompress_member( infd, pp, mpos, outskip, outend );
if( tmp && ( tmp != 2 || !ignore_errors ) ) cleanup_and_fail( tmp );
if( tmp > retval ) retval = tmp;
pp.reset();
}
}
close( infd );
retval = std::max( retval, close_outstream( &in_stats ) );
if( verbosity >= 2 && retval == 0 )
std::fputs( "Byte range decompressed successfully.\n", stderr );
return retval;
}
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