[jira] Commented: (PDFBOX-385) ClassCastException when call parseCOSArray in BaseParser.java

["Rainer Schwarze (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PDFBOX-385?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12646684#action_12646684 ] 

Rainer Schwarze commented on PDFBOX-385:
----------------------------------------

The relevant part of the PDF file is shown below - critical is the line "/K [ 219 0 R 0 R ...". I don't know for sure, whether the PDF spec allows that or not. It seems like not, because trying to "save as" in Acrobat 7 results in an error.
Was this PDF file modified somehow after creating it with PDFMaker?

Relevant part of PDF file:

218 0 obj
<<
/K [ 219 0 R 0 R << /Obj 12 0 R /Pg 5 0 R /Type /OBJR >> ]
/P 217 0 R
/S /Link
>>
endobj
219 0 obj
<<
/K 220 0 R
/P 218 0 R
/S /Hyperlink
>>
endobj


> ClassCastException when call parseCOSArray in BaseParser.java 
> --------------------------------------------------------------
>
>                 Key: PDFBOX-385
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-385
>             Project: PDFBox
>          Issue Type: Bug
>          Components: FontBox
>    Affects Versions: 0.7.0, 0.7.1, 0.7.2, 0.7.3
>         Environment: Window XP professional sp2, liferay 3.3.0 Enterprise + Jboss 402
>            Reporter: Yubin Zheng
>         Attachments: Test9.pdf
>
>
> When parse spefical PDF document, PDF will throw ClassCaseException, then Lucene integrated in Liferay will can not get text by parse PDF to add the index.
> Debug the issue, the method "parseCOSArray" at BaseParser.java  see the caused by it:
>   COSArray po = new COSArray();
>         COSBase pbo = null;
>         skipSpaces();
>         int i = 0;
>         while( ((i = pdfSource.peek()) > 0) && ((char)i != ']') )
>         {
>             pbo = parseDirObject();
>             if( pbo instanceof COSObject )
>             {
>                 COSInteger genNumber = (COSInteger)po.remove( po.size() -1 );
>                 COSInteger number = (COSInteger)po.remove( po.size() -1 );
>                 COSObjectKey key = new COSObjectKey(number.intValue(), genNumber.intValue());
>                 pbo = document.getObjectFromPool(key);
>             }
>             if( pbo != null )
>             {
>                 po.add( pbo );
>             }
>             else
>             {
>                 //it could be a bad object in the array which is just skipped
>             }
>             skipSpaces();
>         }
>         pdfSource.read(); //read ']'
>         skipSpaces();
>         return po;
>     }
> If meet the specific PDF document, the statment     COSInteger number = (COSInteger)po.remove( po.size() -1 ); will raise error, it means the object is COSObject, not COSInteger. so Cast Class fail.

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