Throw a warning if an unexpected marker is found in the middle of the JPEG data stream

git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/branches/1.0.x@524 632fc199-4ca6-4c93-a231-07263d6284db

ChangeLog.txt

@@ -20,6 +20,10 @@ It also ensures that the library can avoid the performance pitfall created by
 [4] Fixed visual artifacts in grayscale JPEG compression caused by a typo in
 the RGB-to-chrominance lookup tables.
 
+[5] Fixed the accelerated Huffman decoder so that it mimics the behavior of
+the unaccelerated decoder and throws a warning if an unexpected marker is found
+in the middle of the JPEG data stream.
+
 
 1.0.1
 =====

jdhuff.c

@@ -621,6 +621,7 @@ decode_mcu_slow (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
   if (val0 == 0xFF) {                                   \
     buffer++;                                           \
     if (val1 != 0) {                                    \
+      cinfo->unread_marker = val1;                      \
       buffer   -= 2;                                    \
       get_buffer      &= ~0xFF;                         \
     }                                                   \
@@ -737,6 +738,11 @@ decode_mcu_fast (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
     }
   }
 
+  if (cinfo->unread_marker != 0 && ! cinfo->entropy->insufficient_data) {
+    WARNMS(cinfo, JWRN_HIT_MARKER);
+    cinfo->entropy->insufficient_data = TRUE;
+  }
+
   br_state.bytes_in_buffer -= (buffer - br_state.next_input_byte);
   br_state.next_input_byte = buffer;
   BITREAD_SAVE_STATE(cinfo,entropy->bitstate);