1 files changed, 123 insertions, 0 deletions
diff --git a/decompress.cc b/decompress.cc
new file mode 100644
index 0000000..0a125d0
--- /dev/null
+++ b/decompress.cc
@@ -0,0 +1,123 @@
+/*  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;
+  }