[jira] Updated: (PDFBOX-898) COSStreamArray NullPointerException. firstStream is null if COSArray contains no items

["Martijn Brinkers (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PDFBOX-898?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Martijn Brinkers updated PDFBOX-898:
------------------------------------

    Attachment: PDFBOX-898.patch

Patch to skip creating COSStreamArray if array is empty

> COSStreamArray NullPointerException. firstStream is null if COSArray contains no items
> --------------------------------------------------------------------------------------
>
>                 Key: PDFBOX-898
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-898
>             Project: PDFBox
>          Issue Type: Bug
>          Components: Parsing
>    Affects Versions: 1.3.1
>            Reporter: Martijn Brinkers
>         Attachments: PDFBOX-898.patch
>
>
> COSStreamArray checks whether array contains any items. If array is empty firstStream is not set and therefore null.
>     public COSStreamArray( COSArray array )
>     {
>         super( new COSDictionary(), null );
>         streams = array;
>         if( array.size() > 0 )
>         {
>             firstStream = (COSStream)array.getObject( 0 );
>         }
>     }
> Most methods of COSStreamArray however use firstStream without any checks which can result in a NullPointerException. 
> I have a PDF that when parsed, results in a NPE because COSStreamArray#getScratchFile is called while firstStream is null.
> One option would be to not create an instance of COSStreamArray when there are no items in the array.
> A patch is attached that checks whether the array is empty and only creates an instance of there are any items.
> The PDF was created with:
> LaTeX with hyperref package
> PDF-1.2

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