Adding upstream version 1.0~rc2.upstream/1.0_rc2

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

1 files changed, 234 insertions, 0 deletions

diff --git a/decoder.c b/decoder.c
new file mode 100644
index 0000000..20799a3
--- /dev/null
+++ b/decoder.c
@@ -0,0 +1,234 @@
+/*  Clzip - A data compressor based on the LZMA algorithm
+    Copyright (C) 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 <errno.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "clzip.h"
+#include "decoder.h"
+
+
+bool Ib_read_block( struct Input_buffer * const ibuf )
+  {
+  if( ibuf->at_stream_end ) return false;
+  ibuf->stream_pos = readblock( ibuf->infd_, ibuf->buffer, Ib_buffer_size );
+  if( ibuf->stream_pos != Ib_buffer_size && errno )
+    { show_error( "read error", errno, false ); cleanup_and_fail( 1 ); }
+  ibuf->pos = 0;
+  ibuf->at_stream_end = ( ibuf->stream_pos < Ib_buffer_size );
+  return !Ib_finished( ibuf );
+  }
+
+
+void LZd_flush_data( struct LZ_decoder * const decoder )
+  {
+  const int size = decoder->pos - decoder->stream_pos;
+  if( size > 0 )
+    {
+    CRC32_update_buf( &decoder->crc_, decoder->buffer + decoder->stream_pos, size );
+    if( decoder->outfd_ >= 0 &&
+        writeblock( decoder->outfd_, decoder->buffer + decoder->stream_pos, size ) != size )
+      { show_error( "write error", errno, false ); cleanup_and_fail( 1 ); }
+    if( decoder->pos >= decoder->buffer_size )
+      { decoder->partial_data_pos += decoder->pos; decoder->pos = 0; }
+    decoder->stream_pos = decoder->pos;
+    }
+  }
+
+
+bool LZd_verify_trailer( struct LZ_decoder * const decoder,
+                         struct Pretty_print * const pp )
+  {
+  bool error = false;
+  File_trailer trailer;
+  const int trailer_size = Ft_size( decoder->format_version );
+  for( int i = 0; i < trailer_size && !error; ++i )
+    {
+    if( !Rd_finished( &decoder->range_decoder ) )
+      trailer[i] = Rd_get_byte( &decoder->range_decoder );
+    else
+      {
+      error = true;
+      if( verbosity >= 0 )
+        {
+        Pp_show_msg( pp, 0 );
+        fprintf( stderr, "trailer truncated at trailer position %d;"
+                 " some checks may fail.\n", i );
+        }
+      }
+    }
+  if( decoder->format_version == 0 )
+    Ft_set_member_size( trailer, LZd_member_position( decoder ) );
+  if( !Rd_code_is_zero( &decoder->range_decoder ) )
+    {
+    error = true;
+    if( verbosity >= 0 )
+      {
+      Pp_show_msg( pp, 0 );
+      fprintf( stderr, "range_decoder final code is not zero.\n" );
+      }
+    }
+  if( Ft_get_data_crc( trailer ) != LZd_crc( decoder ) )
+    {
+    error = true;
+    if( verbosity >= 0 )
+      {
+      Pp_show_msg( pp, 0 );
+      fprintf( stderr, "crc mismatch; trailer says %08X, data crc is %08X.\n",
+               (unsigned int)Ft_get_data_crc( trailer ),
+               (unsigned int)LZd_crc( decoder ) );
+      }
+    }
+  if( Ft_get_data_size( trailer ) != LZd_data_position( decoder ) )
+    {
+    error = true;
+    if( verbosity >= 0 )
+      {
+      Pp_show_msg( pp, 0 );
+      fprintf( stderr, "data size mismatch; trailer says %lld, data size is %lld.\n",
+               Ft_get_data_size( trailer ), LZd_data_position( decoder ) );
+      }
+    }
+  if( Ft_get_member_size( trailer ) != LZd_member_position( decoder ) )
+    {
+    error = true;
+    if( verbosity >= 0 )
+      {
+      Pp_show_msg( pp, 0 );
+      fprintf( stderr, "member size mismatch; trailer says %lld, member size is %lld.\n",
+               Ft_get_member_size( trailer ), LZd_member_position( decoder ) );
+      }
+    }
+  if( !error && verbosity >= 3 )
+    fprintf( stderr, "data crc %08X, data size %9lld, member size %8lld.  ",
+             (unsigned int)Ft_get_data_crc( trailer ),
+             Ft_get_data_size( trailer ), Ft_get_member_size( trailer ) );
+  return !error;
+  }
+
+
+    // Return value: 0 = OK, 1 = decoder error, 2 = unexpected EOF,
+    //               3 = trailer error, 4 = unknown marker found.
+int LZd_decode_member( struct LZ_decoder * const decoder,
+                       struct Pretty_print * const pp )
+  {
+  unsigned int rep0 = 0;	// rep[0-3] latest four distances
+  unsigned int rep1 = 0;	// used for efficient coding of
+  unsigned int rep2 = 0;	// repeated distances
+  unsigned int rep3 = 0;
+  State state = 0;
+
+  while( true )
+    {
+    if( Rd_finished( &decoder->range_decoder ) )
+      { LZd_flush_data( decoder ); return 2; }
+    const int pos_state = LZd_data_position( decoder ) & pos_state_mask;
+    if( Rd_decode_bit( &decoder->range_decoder, &decoder->bm_match[state][pos_state] ) == 0 )
+      {
+      const uint8_t prev_byte = LZd_get_byte( decoder, 0 );
+      if( St_is_char( state ) )
+        LZd_put_byte( decoder, Lid_decode( &decoder->literal_decoder, &decoder->range_decoder, prev_byte ) );
+      else
+        LZd_put_byte( decoder, Lid_decode_matched( &decoder->literal_decoder, &decoder->range_decoder, prev_byte,
+                             LZd_get_byte( decoder, rep0 ) ) );
+      St_set_char( &state );
+      }
+    else
+      {
+      int len;
+      if( Rd_decode_bit( &decoder->range_decoder, &decoder->bm_rep[state] ) == 1 )
+        {
+        len = 0;
+        if( Rd_decode_bit( &decoder->range_decoder, &decoder->bm_rep0[state] ) == 0 )
+          {
+          if( Rd_decode_bit( &decoder->range_decoder, &decoder->bm_len[state][pos_state] ) == 0 )
+            { len = 1; St_set_short_rep( &state ); }
+          }
+        else
+          {
+          unsigned int distance;
+          if( Rd_decode_bit( &decoder->range_decoder, &decoder->bm_rep1[state] ) == 0 )
+            distance = rep1;
+          else
+            {
+            if( Rd_decode_bit( &decoder->range_decoder, &decoder->bm_rep2[state] ) == 0 )
+              distance = rep2;
+            else { distance = rep3; rep3 = rep2; }
+            rep2 = rep1;
+            }
+          rep1 = rep0;
+          rep0 = distance;
+          }
+        if( len == 0 )
+          {
+          len = min_match_len + Led_decode( &decoder->rep_match_len_decoder, &decoder->range_decoder, pos_state );
+          St_set_rep( &state );
+          }
+        }
+      else
+        {
+        unsigned int rep0_saved = rep0;
+        len = min_match_len + Led_decode( &decoder->len_decoder, &decoder->range_decoder, pos_state );
+        const int dis_slot = Rd_decode_tree( &decoder->range_decoder, decoder->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 += Rd_decode_tree_reversed( &decoder->range_decoder, decoder->bm_dis + rep0 - dis_slot, direct_bits );
+          else
+            {
+            rep0 += Rd_decode( &decoder->range_decoder, direct_bits - dis_align_bits ) << dis_align_bits;
+            rep0 += Rd_decode_tree_reversed( &decoder->range_decoder, decoder->bm_align, dis_align_bits );
+            if( rep0 == 0xFFFFFFFF )		// Marker found
+              {
+              rep0 = rep0_saved;
+              Rd_normalize( &decoder->range_decoder );
+              LZd_flush_data( decoder );
+              if( len == min_match_len )	// End Of Stream marker
+                {
+                if( LZd_verify_trailer( decoder, pp ) ) return 0; else return 3;
+                }
+              if( len == min_match_len + 1 )	// Sync Flush marker
+                {
+                Rd_reload( &decoder->range_decoder ); continue;
+                }
+              if( verbosity >= 0 )
+                {
+                Pp_show_msg( pp, 0 );
+                fprintf( stderr, "unsupported marker code `%d'.\n", len );
+                }
+              return 4;
+              }
+            if( rep0 >= (unsigned int)decoder->dictionary_size )
+              { LZd_flush_data( decoder ); return 1; }
+            }
+          }
+        rep3 = rep2; rep2 = rep1; rep1 = rep0_saved;
+        St_set_match( &state );
+        }
+      LZd_copy_block( decoder, rep0, len );
+      }
+    }
+  }