[cff] Ignore unknown operators in charstrings.

Patch suggested by Miles.Lau <sunliang_liu@foxitsoftware.com>.

* src/cff/cffgload.c (cff_decoder_parse_charstrings): Emit tracing
message for unknown operators and continue instead of exiting with a
syntax error.

ChangeLog

@@ -1,3 +1,12 @@
+2011-02-01  Werner Lemberg  <wl@gnu.org>
+
+	[cff] Ignore unknown operators in charstrings.
+	Patch suggested by Miles.Lau <sunliang_liu@foxitsoftware.com>.
+
+	* src/cff/cffgload.c (cff_decoder_parse_charstrings): Emit tracing
+	message for unknown operators and continue instead of exiting with a
+	syntax error.
+
 2011-02-01  Werner Lemberg  <wl@gnu.org>
 
 	[truetype] FT_LOAD_PEDANTIC now affects `prep' and `fpgm' also.

src/cff/cffgload.c

@@ -4,8 +4,7 @@
 /*                                                                         */
 /*    OpenType Glyph Loader (body).                                        */
 /*                                                                         */
-/*  Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,   */
-/*            2010 by                                                      */
+/*  Copyright 1996-2011 by                                                 */
 /*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
 /*                                                                         */
 /*  This file is part of the FreeType project, and may only be used,       */
@@ -1159,8 +1158,8 @@
               op = cff_op_flex1;
               break;
             default:
-              /* decrement ip for syntax error message */
-              ip--;
+              FT_TRACE4(( " unknown op (12, %d)\n", v ));
+              break;
             }
           }
           break;
@@ -1213,11 +1212,12 @@
           op = cff_op_hvcurveto;
           break;
         default:
+          FT_TRACE4(( " unknown op (%d)\n", v ));
           break;
         }
 
         if ( op == cff_op_unknown )
-          goto Syntax_Error;
+          continue;
 
         /* check arguments */
         req_args = cff_argument_counts[op];