shithub: jbig2

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Only check for a code length antecedent under RUNCODE32. RUNCODE33 and 
RUNCODE34 specify a repeat of zero so a previous code length isn't 
necessary.

Thanks to Justin Greer for catching this. Ghostscript bug 689835.


git-svn-id: http://svn.ghostscript.com/jbig2dec/trunk@466 ded80894-8fb9-0310-811b-c03f3676ab4d

--- a/jbig2_text.c

+++ b/jbig2_text.c

@@ -141,14 +141,14 @@

 	    len = code;

 	    range = 1;

 	  } else {

-	    if (index < 1) {

-	      jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,

-		"error decoding symbol id table: run length with no antecedent!");

-	      /* todo: memory cleanup */

-	      return -1;

-	    }

 	    if (code == 32) {

 	      len = symcodelengths[index-1].PREFLEN;

+	      if (index < 1) {

+		jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,

+	 	  "error decoding symbol id table: run length with no antecedent!");

+	        /* todo: memory cleanup */

+	        return -1;

+	      }

 	    } else {

 	      len = 0; /* code == 33 or 34 */

 	    }