Adding upstream version 1.0~rc1.upstream/1.0_rc1

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

1 files changed, 248 insertions, 0 deletions

diff --git a/decoder.c b/decoder.c
new file mode 100644
index 0000000..e6af722
--- /dev/null
+++ b/decoder.c
@@ -0,0 +1,248 @@
+/*  Lunzip - Decompressor for lzip files
+    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 "lunzip.h"
+#include "decoder.h"
+
+
+CRC32 crc32;
+
+bool Rd_read_block( struct Range_decoder * const rdec )
+  {
+  if( !rdec->at_stream_end )
+    {
+    rdec->stream_pos = readblock( rdec->infd, rdec->buffer, rd_buffer_size );
+    if( rdec->stream_pos != rd_buffer_size && errno )
+      { show_error( "Read error", errno, false ); cleanup_and_fail( 1 ); }
+    rdec->at_stream_end = ( rdec->stream_pos < rd_buffer_size );
+    rdec->partial_member_pos += rdec->pos;
+    rdec->pos = 0;
+    }
+  return rdec->pos < rdec->stream_pos;
+  }
+
+
+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 )
+  {
+  int i;
+  File_trailer trailer;
+  const int trailer_size = Ft_versioned_size( decoder->member_version );
+  const long long member_size =
+    Rd_member_position( decoder->range_decoder ) + trailer_size;
+  bool error = false;
+
+  for( 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( pp->verbosity >= 0 )
+        {
+        Pp_show_msg( pp, 0 );
+        fprintf( stderr, "Trailer truncated at trailer position %d;"
+                         " some checks may fail.\n", i );
+        }
+      for( ; i < trailer_size; ++i ) trailer[i] = 0;
+      }
+    }
+  if( decoder->member_version == 0 ) Ft_set_member_size( trailer, member_size );
+  if( !Rd_code_is_zero( decoder->range_decoder ) )
+    {
+    error = true;
+    Pp_show_msg( pp, "Range decoder final code is not zero" );
+    }
+  if( Ft_get_data_crc( trailer ) != LZd_crc( decoder ) )
+    {
+    error = true;
+    if( pp->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( pp->verbosity >= 0 )
+      {
+      Pp_show_msg( pp, 0 );
+      fprintf( stderr, "Data size mismatch; trailer says %lld, data size is %lld (0x%llX).\n",
+               Ft_get_data_size( trailer ), LZd_data_position( decoder ), LZd_data_position( decoder ) );
+      }
+    }
+  if( Ft_get_member_size( trailer ) != member_size )
+    {
+    error = true;
+    if( pp->verbosity >= 0 )
+      {
+      Pp_show_msg( pp, 0 );
+      fprintf( stderr, "Member size mismatch; trailer says %lld, member size is %lld (0x%llX).\n",
+               Ft_get_member_size( trailer ), member_size, member_size );
+      }
+    }
+  if( !error && pp->verbosity >= 4 && LZd_data_position( decoder ) > 0 && member_size > 0 )
+    fprintf( stderr, "%6.3f:1, %6.3f bits/byte, %5.2f%% saved.  ",
+             (double)LZd_data_position( decoder ) / member_size,
+             ( 8.0 * member_size ) / LZd_data_position( decoder ),
+             100.0 * ( 1.0 - ( (double)member_size / LZd_data_position( decoder ) ) ) );
+  if( !error && pp->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;
+  Rd_load( decoder->range_decoder );
+
+  while( true )
+    {
+    const int pos_state = LZd_data_position( decoder ) & pos_state_mask;
+    if( Rd_finished( decoder->range_decoder ) )
+      { LZd_flush_data( decoder ); return 2; }
+    if( Rd_decode_bit( decoder->range_decoder, &decoder->bm_match[state][pos_state] ) == 0 )
+      {
+      const uint8_t prev_byte = LZd_get_prev_byte( decoder );
+      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] ) == 1 )
+          {
+          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;
+          }
+        else
+          {
+          if( Rd_decode_bit( decoder->range_decoder, &decoder->bm_len[state][pos_state] ) == 0 )
+            { St_set_short_rep( &state ); len = 1; }
+          }
+        if( len == 0 )
+          {
+          St_set_rep( &state );
+          len = min_match_len + Led_decode( &decoder->rep_match_len_decoder, decoder->range_decoder, pos_state );
+          }
+        }
+      else
+        {
+        int dis_slot;
+        const unsigned int rep0_saved = rep0;
+        len = min_match_len + Led_decode( &decoder->len_decoder, decoder->range_decoder, pos_state );
+        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 == 0xFFFFFFFFU )		/* 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_load( decoder->range_decoder ); continue;
+                }
+              if( pp->verbosity >= 0 )
+                {
+                Pp_show_msg( pp, 0 );
+                fprintf( stderr, "Unsupported marker code `%d'.\n", len );
+                }
+              return 4;
+              }
+            }
+          }
+        rep3 = rep2; rep2 = rep1; rep1 = rep0_saved;
+        St_set_match( &state );
+        if( rep0 >= (unsigned int)decoder->dictionary_size ||
+            ( rep0 >= (unsigned int)decoder->pos && !decoder->partial_data_pos ) )
+          { LZd_flush_data( decoder ); return 1; }
+        }
+      LZd_copy_block( decoder, rep0, len );
+      }
+    }
+  }