Adding upstream version 1.6~pre1.upstream/1.6_pre1

Signed-off-by: Daniel Baumann <mail@daniel-baumann.ch>

1 files changed, 218 insertions, 0 deletions

diff --git a/decoder.cc b/decoder.cc
new file mode 100644
index 0000000..341740b
--- /dev/null
+++ b/decoder.cc
@@ -0,0 +1,218 @@
+/*  Lzip - A data compressor based on the LZMA algorithm
+    Copyright (C) 2008, 2009 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 <cerrno>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <string>
+#include <vector>
+#include <stdint.h>
+
+#include "lzip.h"
+#include "decoder.h"
+
+
+const CRC32 crc32;
+
+
+bool Input_buffer::read_block()
+  {
+  if( at_stream_end ) return false;
+  stream_pos = readblock( ides_, (char *)buffer, buffer_size );
+  if( stream_pos != buffer_size && errno ) throw Error( "read error" );
+  pos = 0;
+  at_stream_end = ( stream_pos < buffer_size );
+  return !finished();
+  }
+
+
+void LZ_decoder::flush_data()
+  {
+  if( !member_finished )
+    {
+    if( odes_ >= 0 )
+      {
+      const int wr = writeblock( odes_, (char *)buffer, pos );
+      if( wr != pos ) throw Error( "write error" );
+      }
+    if( pos >= buffer_size ) { partial_data_pos += pos; pos = 0; }
+    else member_finished = true;
+    }
+  }
+
+
+bool LZ_decoder::verify_trailer( const Pretty_print & pp ) const
+  {
+  bool error = false;
+  File_trailer trailer;
+  const int trailer_size = trailer.size( format_version );
+  for( int i = 0; i < trailer_size && !error; ++i )
+    {
+    if( range_decoder.finished() )
+      {
+      error = true;
+      if( verbosity >= 0 )
+        {
+        pp();
+        std::fprintf( stderr, "trailer truncated at trailer position %d;"
+                              " some checks may fail.\n", i );
+        }
+      }
+    ((uint8_t *)&trailer)[i] = range_decoder.read_byte();
+    }
+  if( format_version == 0 ) trailer.member_size( member_position() );
+  if( trailer.data_crc() != crc() )
+    {
+    error = true;
+    if( verbosity >= 0 )
+      {
+      pp();
+      std::fprintf( stderr, "crc mismatch; trailer says %08X, data crc is %08X.\n",
+                    trailer.data_crc(), crc() );
+      }
+    }
+  if( trailer.data_size() != data_position() )
+    {
+    error = true;
+    if( verbosity >= 0 )
+      {
+      if( trailer.data_size() >= 0 )
+        { pp();
+          std::fprintf( stderr, "data size mismatch; trailer says %lld, data size is %lld.\n",
+                        trailer.data_size(), data_position() ); }
+      else pp( "member trailer is corrupt" );
+      }
+    }
+  if( trailer.member_size() != member_position() )
+    {
+    error = true;
+    if( verbosity >= 0 )
+      {
+      if( trailer.member_size() >= 0 )
+        { pp();
+          std::fprintf( stderr, "member size mismatch; trailer says %lld, member size is %lld.\n",
+                        trailer.member_size(), member_position() ); }
+      else pp( "member trailer is corrupt" );
+      }
+    }
+  if( !error && verbosity >= 3 )
+    std::fprintf( stderr, "data crc %08X, data size %8lld, member size %8lld.  ",
+                  trailer.data_crc(), trailer.data_size(), trailer.member_size() );
+  return !error;
+  }
+
+
+    // Return value: 0 = OK, 1 = decoder error, 2 = unexpected EOF,
+    //               3 = trailer error, 4 = unknown marker found.
+int LZ_decoder::decode_member( const Pretty_print & pp )
+  {
+  unsigned int rep0 = 0;
+  unsigned int rep1 = 0;
+  unsigned int rep2 = 0;
+  unsigned int rep3 = 0;
+  State state;
+  uint8_t prev_byte = 0;
+
+  while( true )
+    {
+    if( range_decoder.finished() ) { flush_data(); return 2; }
+    const int pos_state = data_position() & pos_state_mask;
+    if( range_decoder.decode_bit( bm_match[state()][pos_state] ) == 0 )
+      {
+      if( state.is_char() )
+        prev_byte = literal_decoder.decode( range_decoder, prev_byte );
+      else
+        prev_byte = literal_decoder.decode_matched( range_decoder, prev_byte,
+                                                    get_byte( rep0 ) );
+      put_byte( prev_byte );
+      state.set_char();
+      }
+    else
+      {
+      int len;
+      if( range_decoder.decode_bit( bm_rep[state()] ) == 1 )
+        {
+        len = 0;
+        if( range_decoder.decode_bit( bm_rep0[state()] ) == 0 )
+          {
+          if( range_decoder.decode_bit( bm_len[state()][pos_state] ) == 0 )
+            { len = 1; state.set_short_rep(); }
+          }
+        else
+          {
+          unsigned int distance;
+          if( range_decoder.decode_bit( bm_rep1[state()] ) == 0 )
+            distance = rep1;
+          else
+            {
+            if( range_decoder.decode_bit( bm_rep2[state()] ) == 0 )
+              distance = rep2;
+            else { distance = rep3; rep3 = rep2; }
+            rep2 = rep1;
+            }
+          rep1 = rep0;
+          rep0 = distance;
+          }
+        if( len == 0 )
+          {
+          len = min_match_len + rep_match_len_decoder.decode( range_decoder, pos_state );
+          state.set_rep();
+          }
+        }
+      else
+        {
+        rep3 = rep2; rep2 = rep1; rep1 = rep0;
+        len = min_match_len + len_decoder.decode( range_decoder, pos_state );
+        state.set_match();
+        const int dis_slot = range_decoder.decode_tree( bm_dis_slot[get_dis_state(len)], dis_slot_bits );
+        if( dis_slot < start_dis_model ) rep0 = dis_slot;
+        else
+          {
+          const int direct_bits = ( dis_slot >> 1 ) - 1;
+          rep0 = ( 2 | ( dis_slot & 1 ) ) << direct_bits;
+          if( dis_slot < end_dis_model )
+            rep0 += range_decoder.decode_tree_reversed( bm_dis + rep0 - dis_slot, direct_bits );
+          else
+            {
+            rep0 += range_decoder.decode( direct_bits - dis_align_bits ) << dis_align_bits;
+            rep0 += range_decoder.decode_tree_reversed( bm_align, dis_align_bits );
+            if( rep0 == 0xFFFFFFFF )		// Marker found
+              {
+              if( len == min_match_len )	// End Of Stream marker
+                {
+                flush_data();
+                if( verify_trailer( pp ) ) return 0; else return 3;
+                }
+              if( verbosity >= 0 )
+                {
+                pp();
+                std::fprintf( stderr, "unsupported marker code `%d'.\n", len );
+                }
+              flush_data();
+              return 4;
+              }
+            }
+          }
+        }
+      if( !copy_block( rep0, len ) ) { flush_data(); return 1; }
+      prev_byte = get_byte( 0 );
+      }
+    }
+  }