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-rw-r--r--decompress.cc123
1 files changed, 123 insertions, 0 deletions
diff --git a/decompress.cc b/decompress.cc
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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;
+ }