Adding upstream version 1.7.upstream/1.7

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

1 files changed, 7 insertions, 6 deletions

diff --git a/decoder.h b/decoder.h
index 290ab97..e4444f1 100644
--- a/decoder.h
+++ b/decoder.h
@@ -21,7 +21,7 @@ class Input_buffer
   uint8_t * const buffer;
   int pos;
   int stream_pos;		// when reached, a new block must be read
-  const int ides_;
+  const int ides_;		// input file descriptor
   bool at_stream_end;
 
   bool read_block();
@@ -196,11 +196,11 @@ class Literal_decoder
     { return ( prev_byte >> ( 8 - literal_context_bits ) ); }
 
 public:
-  uint8_t decode( Range_decoder & range_decoder, const int prev_byte )
+  uint8_t decode( Range_decoder & range_decoder, const uint8_t prev_byte )
     { return range_decoder.decode_tree( bm_literal[state(prev_byte)], 8 ); }
 
   uint8_t decode_matched( Range_decoder & range_decoder,
-                          const int prev_byte, const int match_byte )
+                          const uint8_t prev_byte, const uint8_t match_byte )
     { return range_decoder.decode_matched( bm_literal[state(prev_byte)], match_byte ); }
   };
 
@@ -215,7 +215,7 @@ class LZ_decoder
   int pos;
   int stream_pos;		// first byte not yet written to file
   uint32_t crc_;
-  const int odes_;
+  const int odes_;		// output file descriptor
 
   Bit_model bm_match[State::states][pos_states];
   Bit_model bm_rep[State::states];
@@ -249,7 +249,7 @@ class LZ_decoder
     {
     int i = pos - distance - 1;
     if( i < 0 ) i += buffer_size;
-    if( len < buffer_size - std::max( pos, i ) && len <= distance )
+    if( len < buffer_size - std::max( pos, i ) && len <= std::abs( pos - i ) )
       {
       std::memcpy( buffer + pos, buffer + i, len );
       pos += len;
@@ -278,7 +278,8 @@ public:
     crc_( 0xFFFFFFFF ),
     odes_( odes ),
     range_decoder( sizeof header, ibuf ),
-    literal_decoder() {}
+    literal_decoder()
+    { buffer[buffer_size-1] = 0; }	// prev_byte of first_byte
 
   ~LZ_decoder() { delete[] buffer; }