From 0aff25f0baaa9ebac7ca3711513fcf855fc017ab Mon Sep 17 00:00:00 2001
From: Daniel Baumann <mail@daniel-baumann.ch>
Date: Sat, 7 Nov 2015 10:56:54 +0100
Subject: Merging upstream version 1.15~pre1.

Signed-off-by: Daniel Baumann <mail@daniel-baumann.ch>
---
 decoder.cc | 67 ++++++++++++++++++++++++++++++--------------------------------
 1 file changed, 32 insertions(+), 35 deletions(-)

(limited to 'decoder.cc')

diff --git a/decoder.cc b/decoder.cc
index 537143f..1d4774f 100644
--- a/decoder.cc
+++ b/decoder.cc
@@ -122,10 +122,10 @@ bool LZ_decoder::verify_trailer( const Pretty_print & pp ) const
   File_trailer trailer;
   const int trailer_size = File_trailer::size( member_version );
   const unsigned long long member_size =
-    range_decoder.member_position() + trailer_size;
+    rdec.member_position() + trailer_size;
   bool error = false;
 
-  int size = range_decoder.read_data( trailer.data, trailer_size );
+  int size = rdec.read_data( trailer.data, trailer_size );
   if( size < trailer_size )
     {
     error = true;
@@ -140,7 +140,7 @@ bool LZ_decoder::verify_trailer( const Pretty_print & pp ) const
 
   if( member_version == 0 ) trailer.member_size( member_size );
 
-  if( !range_decoder.code_is_zero() )
+  if( !rdec.code_is_zero() )
     {
     error = true;
     pp( "Range decoder final code is not zero" );
@@ -201,82 +201,79 @@ int LZ_decoder::decode_member( const Pretty_print & pp )
   Bit_model bm_dis_slot[max_dis_states][1<<dis_slot_bits];
   Bit_model bm_dis[modeled_distances-end_dis_model];
   Bit_model bm_align[dis_align_size];
-  Len_decoder len_decoder;
-  Len_decoder rep_match_len_decoder;
+  Len_model match_len_model;
+  Len_model rep_len_model;
 
   unsigned rep0 = 0;		// rep[0-3] latest four distances
   unsigned rep1 = 0;		// used for efficient coding of
   unsigned rep2 = 0;		// repeated distances
   unsigned rep3 = 0;
-
   State state;
-  range_decoder.load();
 
-  while( !range_decoder.finished() )
+  rdec.load();
+  while( !rdec.finished() )
     {
     const int pos_state = data_position() & pos_state_mask;
-    if( range_decoder.decode_bit( bm_match[state()][pos_state] ) == 0 )
+    if( rdec.decode_bit( bm_match[state()][pos_state] ) == 0 )
       {
       const uint8_t prev_byte = get_prev_byte();
       if( state.is_char() )
-        put_byte( range_decoder.decode_tree( bm_literal[get_lit_state(prev_byte)], 8 ) );
+        put_byte( rdec.decode_tree( bm_literal[get_lit_state(prev_byte)], 8 ) );
       else
-        put_byte( range_decoder.decode_matched( bm_literal[get_lit_state(prev_byte)],
-                                                get_byte( rep0 ) ) );
+        put_byte( rdec.decode_matched( bm_literal[get_lit_state(prev_byte)],
+                                       get_byte( rep0 ) ) );
       state.set_char();
       }
     else
       {
       int len;
-      if( range_decoder.decode_bit( bm_rep[state()] ) == 1 )
+      if( rdec.decode_bit( bm_rep[state()] ) == 1 )
         {
-        len = 0;
-        if( range_decoder.decode_bit( bm_rep0[state()] ) == 1 )
+        if( rdec.decode_bit( bm_rep0[state()] ) == 0 )
+          {
+          if( rdec.decode_bit( bm_len[state()][pos_state] ) == 0 )
+            { state.set_short_rep(); put_byte( get_byte( rep0 ) ); continue; }
+          }
+        else
           {
           unsigned distance;
-          if( range_decoder.decode_bit( bm_rep1[state()] ) == 0 )
+          if( rdec.decode_bit( bm_rep1[state()] ) == 0 )
             distance = rep1;
           else
             {
-            if( range_decoder.decode_bit( bm_rep2[state()] ) == 0 )
+            if( rdec.decode_bit( bm_rep2[state()] ) == 0 )
               distance = rep2;
-            else { distance = rep3; rep3 = rep2; }
+            else
+              { distance = rep3; rep3 = rep2; }
             rep2 = rep1;
             }
           rep1 = rep0;
           rep0 = distance;
           }
-        else
-          {
-          if( range_decoder.decode_bit( bm_len[state()][pos_state] ) == 0 )
-            { state.set_short_rep(); len = 1; }
-          }
-        if( len == 0 )
-          {
-          state.set_rep();
-          len = min_match_len + rep_match_len_decoder.decode( range_decoder, pos_state );
-          }
+        len = min_match_len + rdec.decode_len( rep_len_model, pos_state );
+        state.set_rep();
         }
       else
         {
         const unsigned rep0_saved = rep0;
-        len = min_match_len + len_decoder.decode( range_decoder, pos_state );
-        const int dis_slot = range_decoder.decode_tree6( bm_dis_slot[get_dis_state(len)] );
+        len = min_match_len + rdec.decode_len( match_len_model, pos_state );
+        const int dis_slot = rdec.decode_tree6( bm_dis_slot[get_dis_state(len)] );
         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 - 1, direct_bits );
+            rep0 += rdec.decode_tree_reversed( bm_dis + rep0 - dis_slot - 1,
+                                               direct_bits );
           else
             {
-            rep0 += range_decoder.decode( direct_bits - dis_align_bits ) << dis_align_bits;
-            rep0 += range_decoder.decode_tree_reversed4( bm_align );
+            rep0 += rdec.decode( direct_bits - dis_align_bits ) << dis_align_bits;
+            rep0 += rdec.decode_tree_reversed4( bm_align );
             if( rep0 == 0xFFFFFFFFU )		// Marker found
               {
               rep0 = rep0_saved;
-              range_decoder.normalize();
+              rdec.normalize();
               flush_data();
               if( len == min_match_len )	// End Of Stream marker
                 {
@@ -284,7 +281,7 @@ int LZ_decoder::decode_member( const Pretty_print & pp )
                 }
               if( len == min_match_len + 1 )	// Sync Flush marker
                 {
-                range_decoder.load(); continue;
+                rdec.load(); continue;
                 }
               if( pp.verbosity() >= 0 )
                 {
-- 
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