Merging upstream version 1.12.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 20 insertions, 25 deletions

diff --git a/decoder.h b/decoder.h
index 95c9bab..a8d8eab 100644
--- a/decoder.h
+++ b/decoder.h
@@ -1,18 +1,18 @@
-/*  Clzip - LZMA lossless data compressor
-    Copyright (C) 2010-2019 Antonio Diaz Diaz.
+/* Clzip - LZMA lossless data compressor
+   Copyright (C) 2010-2021 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 2 of the License, or
-    (at your option) any later version.
+   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 2 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.
+   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/>.
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 enum { rd_buffer_size = 16384 };
@@ -107,7 +107,7 @@ static inline unsigned Rd_decode( struct Range_decoder * const rdec,
 /*    symbol <<= 1; */
 /*    if( rdec->code >= rdec->range ) { rdec->code -= rdec->range; symbol |= 1; } */
     bit = ( rdec->code >= rdec->range );
-    symbol = ( symbol << 1 ) + bit;
+    symbol <<= 1; symbol += bit;
     rdec->code -= rdec->range & ( 0U - bit );
     }
   return symbol;
@@ -137,8 +137,7 @@ static inline unsigned Rd_decode_bit( struct Range_decoder * const rdec,
 static inline unsigned Rd_decode_tree3( struct Range_decoder * const rdec,
                                         Bit_model bm[] )
   {
-  unsigned symbol = 1;
-  symbol = ( symbol << 1 ) | Rd_decode_bit( rdec, &bm[symbol] );
+  unsigned symbol = 2 | Rd_decode_bit( rdec, &bm[1] );
   symbol = ( symbol << 1 ) | Rd_decode_bit( rdec, &bm[symbol] );
   symbol = ( symbol << 1 ) | Rd_decode_bit( rdec, &bm[symbol] );
   return symbol & 7;
@@ -147,8 +146,7 @@ static inline unsigned Rd_decode_tree3( struct Range_decoder * const rdec,
 static inline unsigned Rd_decode_tree6( struct Range_decoder * const rdec,
                                         Bit_model bm[] )
   {
-  unsigned symbol = 1;
-  symbol = ( symbol << 1 ) | Rd_decode_bit( rdec, &bm[symbol] );
+  unsigned symbol = 2 | Rd_decode_bit( rdec, &bm[1] );
   symbol = ( symbol << 1 ) | Rd_decode_bit( rdec, &bm[symbol] );
   symbol = ( symbol << 1 ) | Rd_decode_bit( rdec, &bm[symbol] );
   symbol = ( symbol << 1 ) | Rd_decode_bit( rdec, &bm[symbol] );
@@ -177,7 +175,7 @@ Rd_decode_tree_reversed( struct Range_decoder * const rdec,
   for( i = 0; i < num_bits; ++i )
     {
     const unsigned bit = Rd_decode_bit( rdec, &bm[model] );
-    model = ( model << 1 ) + bit;
+    model <<= 1; model += bit;
     symbol |= ( bit << i );
     }
   return symbol;
@@ -187,12 +185,9 @@ static inline unsigned
 Rd_decode_tree_reversed4( struct Range_decoder * const rdec, Bit_model bm[] )
   {
   unsigned symbol = Rd_decode_bit( rdec, &bm[1] );
-  unsigned model = 2 + symbol;
-  unsigned bit = Rd_decode_bit( rdec, &bm[model] );
-  model = ( model << 1 ) + bit; symbol |= ( bit << 1 );
-  bit = Rd_decode_bit( rdec, &bm[model] );
-  model = ( model << 1 ) + bit; symbol |= ( bit << 2 );
-  symbol |= ( Rd_decode_bit( rdec, &bm[model] ) << 3 );
+  symbol += Rd_decode_bit( rdec, &bm[2+symbol] ) << 1;
+  symbol += Rd_decode_bit( rdec, &bm[4+symbol] ) << 2;
+  symbol += Rd_decode_bit( rdec, &bm[8+symbol] ) << 3;
   return symbol;
   }
 
@@ -205,7 +200,7 @@ static inline unsigned Rd_decode_matched( struct Range_decoder * const rdec,
     {
     const unsigned match_bit = ( match_byte <<= 1 ) & mask;
     const unsigned bit = Rd_decode_bit( rdec, &bm[symbol+match_bit+mask] );
-    symbol = ( symbol << 1 ) + bit;
+    symbol <<= 1; symbol += bit;
     if( symbol > 0xFF ) return symbol & 0xFF;
     mask &= ~(match_bit ^ (bit << 8));	/* if( match_bit != bit ) mask = 0; */
     }