Bug 690597

Summary:	Interpretation of PDF file fails with typecheck after the 41. page
Product:	Ghostscript	Reporter:	artifex
Component:	PDF Interpreter	Assignee:	Alex Cherepanov <alex>
Status:	NOTIFIED FIXED
Severity:	normal
Priority:	P2
Version:	8.64
Hardware:	PC
OS:	Windows XP
Customer:	870	Word Size:	---

Description artifex 2009-07-03 07:12:24 UTC

When the attached file Harzt-ghost.pdf is interpreted with the Ghostscript ( for
example:  gs -sDEVICE=tiffg4 -dNOPAUSE -o out.tif Harzt-ghost.pdf ) , the
processing fails after the 41. page with a typecheck.

Comment 1 artifex 2009-07-03 07:13:44 UTC

Created attachment 5181 [details]
Harzt-ghost.pdf

Comment 2 Alex Cherepanov 2009-07-03 10:41:32 UTC

The file has the following invalid reference:

  395 0 obj <</Type/ExtGState /SMask 0 0 R>> endobj

Probably, Ghostscript should check for "0 0 R" and consider the attribute
undefined. This check won't slow PDF interpreter too much if "knownoget"
procedure is ported to C.

Comment 3 Alex Cherepanov 2009-07-04 15:49:19 UTC

Add a check for a null value of SMask attribute in ExtGState. This also works
for invalid SMask reference, which is already converted to null.

The following patch has been committed as a rev. 9839.
http://ghostscript.com/pipermail/gs-cvs/2009-July/009518.html
Regression testing shows no differences.

Comment 4 Marcos H. Woehrmann 2011-09-18 21:47:27 UTC

Changing customer bugs that have been resolved more than a year ago to closed.