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From Andreas Lehmkühler (Resolved) (JIRA) <j...@apache.org>
Subject [jira] [Resolved] (PDFBOX-1233) CCITTFaxG31DDecodeInputStream - Extended codes have wrong length
Date Sun, 11 Mar 2012 13:59:58 GMT

     [ https://issues.apache.org/jira/browse/PDFBOX-1233?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Andreas Lehmkühler resolved PDFBOX-1233.
----------------------------------------

       Resolution: Fixed
    Fix Version/s: 1.7.0
         Assignee: Andreas Lehmkühler

I was able to double check the patch using a sample pdf Dave sent me in private as it is confidential.

I added the patch in revision 1299358 as proposed.

Thanks for the contribution!
                
> CCITTFaxG31DDecodeInputStream - Extended codes have wrong length
> ----------------------------------------------------------------
>
>                 Key: PDFBOX-1233
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-1233
>             Project: PDFBox
>          Issue Type: Bug
>            Reporter: Dave Smith
>            Assignee: Andreas Lehmkühler
>             Fix For: 1.7.0
>
>
> When dealing with large fax images there are Extended Make Up Codes.
> They are added to the tree as ...
> buildUpMakeUp(LONG_MAKE_UP, WHITE_LOOKUP_TREE_ROOT);
> buildUpMakeUp(LONG_MAKE_UP, BLACK_LOOKUP_TREE_ROOT);
> Accept, the length is 0 based not starting at 1792.
> The quick hack is to create a new method so the length of the node is correct
>  private static void buildUpMakeUpLong(short[] codes,
> NonLeafLookupTreeNode root)
>    {
>        for (int len = 0, c = codes.length; len < c; len++)
>        {
>            LookupTreeNode leaf = new MakeUpTreeNode((len + 28) * 64);
>            addLookupTreeNode(codes[len], root, leaf);
>        }
>    }
> as thus ...
> buildUpMakeUpLong(LONG_MAKE_UP, WHITE_LOOKUP_TREE_ROOT);
> buildUpMakeUpLong(LONG_MAKE_UP, BLACK_LOOKUP_TREE_ROOT);

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