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/* Plzip - A parallel compressor compatible with lzip
Copyright (C) 2009 Laszlo Ersek.
Copyright (C) 2009, 2010 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 <algorithm>
#include <cerrno>
#include <climits>
#include <csignal>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <queue>
#include <string>
#include <vector>
#include <pthread.h>
#include <stdint.h>
#include <unistd.h>
#include <lzlib.h>
#include "plzip.h"
namespace {
int do_decompress( LZ_Decoder * const decoder, const int infd, const int outfd,
const Pretty_print & pp, const bool testing )
{
const int in_buffer_size = 65536, out_buffer_size = 8 * in_buffer_size;
uint8_t in_buffer[in_buffer_size], out_buffer[out_buffer_size];
while( true )
{
int in_size = std::min( LZ_decompress_write_size( decoder ), in_buffer_size );
if( in_size > 0 )
{
const int max_in_size = in_size;
in_size = readblock( infd, in_buffer, max_in_size );
if( in_size != max_in_size && errno )
{ pp(); show_error( "read error", errno ); return 1; }
if( in_size == 0 ) LZ_decompress_finish( decoder );
else if( in_size != LZ_decompress_write( decoder, in_buffer, in_size ) )
internal_error( "library error (LZ_decompress_write)" );
}
int out_size = LZ_decompress_read( decoder, out_buffer, out_buffer_size );
// std::fprintf( stderr, "%5d in_size, %6d out_size.\n", in_size, out_size );
if( out_size < 0 )
{
const LZ_Errno lz_errno = LZ_decompress_errno( decoder );
if( lz_errno == LZ_header_error )
{
if( LZ_decompress_total_out_size( decoder ) > 0 )
break; // trailing garbage
pp( "error reading member header" );
return 1;
}
if( lz_errno == LZ_mem_error )
{
pp( "not enough memory. Find a machine with more memory" );
return 1;
}
pp();
if( lz_errno == LZ_unexpected_eof )
{
if( verbosity >= 0 )
std::fprintf( stderr, "file ends unexpectedly at pos %lld\n",
LZ_decompress_total_in_size( decoder ) );
return 2;
}
if( verbosity >= 0 )
std::fprintf( stderr, "LZ_decompress_read error: %s.\n",
LZ_strerror( LZ_decompress_errno( decoder ) ) );
return 1;
}
else if( out_size > 0 && outfd >= 0 )
{
const int wr = writeblock( outfd, out_buffer, out_size );
if( wr != out_size )
{ pp(); show_error( "write error", errno ); return 1; }
}
if( LZ_decompress_finished( decoder ) == 1 ) break;
if( in_size == 0 && out_size == 0 )
internal_error( "library error (LZ_decompress_read)" );
}
if( verbosity >= 1 )
{ if( testing ) std::fprintf( stderr, "ok\n" );
else std::fprintf( stderr, "done\n" ); }
return 0;
}
} // end namespace
int decompress( const int infd, const int outfd, const Pretty_print & pp,
const bool testing )
{
LZ_Decoder * const decoder = LZ_decompress_open();
int retval;
if( !decoder || LZ_decompress_errno( decoder ) != LZ_ok )
{
pp( "not enough memory" );
retval = 1;
}
else retval = do_decompress( decoder, infd, outfd, pp, testing );
LZ_decompress_close( decoder );
return retval;
}
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