Bug 688479 - gs-afpl 8.53 generates strange (incorrect) warning about circular references in resource dictionaries
Summary: gs-afpl 8.53 generates strange (incorrect) warning about circular references ...
Status: NOTIFIED FIXED
Alias: None
Product: Ghostscript
Classification: Unclassified
Component: PDF Interpreter (show other bugs)
Version: 8.53
Hardware: PC Linux
: P4 normal
Assignee: Alex Cherepanov
URL: https://sourceforge.net/tracker/?func...
Keywords:
Depends on:
Blocks:
 
Reported: 2006-01-02 10:42 UTC by Malte Cornils
Modified: 2008-12-19 08:31 UTC (History)
1 user (show)

See Also:
Customer:
Word Size: ---

Attachments
the pdf file in question (3.14 KB, application/pdf)
2006-01-02 13:33 UTC, Hin-Tak Leung 		Details
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Description Malte Cornils 2006-01-02 10:42:30 UTC 
Hi, I had reported a PDF which gs-afpl 8.53 complained about to the developer 
of http://multivalent.sf.net/ ; I have added the bug tracking URL above. 
 
We came to the conclusion that gs-afpl generates the warning 
File has circular references in resource dictionaries.  
incorrectly.  
 
I was unable to find any text in the PDF reference manual about multiply 
declared resource references. However, gs-afpl shows this as errors. Maybe you 
could take a look at the bug report? I will gladly assist with further 
explanations and debugging help. 
 
-Malte Cornils
Comment 1 Hin-Tak Leung 2006-01-02 13:33:06 UTC 
Created attachment 1904 [details]
the pdf file in question

The pdf file in the original bug report. tried it with gs x86 linux:
==========
 gs
sourceforge.net/tracker/download.php\?group_id=44509\&atid=439983\&file_id=161511\&aid=1393280

AFPL Ghostscript 8.53 (2005-10-20)
Copyright (C) 2005 artofcode LLC, Benicia, CA.	All rights reserved.
This software comes with NO WARRANTY: see the file PUBLIC for details.
Processing pages 1 through 2.
Page 1
   **** File has circular references in resource dictionaries.
   **** File has circular references in resource dictionaries.
   **** File has circular references in resource dictionaries.
   **** File has circular references in resource dictionaries.
>>showpage, press <return> to continue<<

Page 2
   **** File has circular references in resource dictionaries.
   **** File has circular references in resource dictionaries.
   **** File has circular references in resource dictionaries.
   **** File has circular references in resource dictionaries.
>>showpage, press <return> to continue<<


   **** This file had errors that were repaired or ignored.
   **** The file was produced by: 
   **** >>>> Libpdf for Scribus 1.3.2cvs <<<<
   **** Please notify the author of the software that produced this
   **** file that it does not conform to Adobe's published PDF
   **** specification.
============
Comment 2 Alex Cherepanov 2007-06-12 19:44:11 UTC 
Fix false detection of circular references in the resource chain. Valid PDF
resource references form a directed acyclic graph but the old code was
checking for a tree.

A patch is committed as a rev. 8047.