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Posted to dev@pdfbox.apache.org by "Jeremias Maerki (JIRA)" <ji...@apache.org> on 2011/08/10 16:54:27 UTC
[jira] [Created] (PDFBOX-1086) Error when decoding CCITT compressed
data that contains EOLs, fill bits etc.
Error when decoding CCITT compressed data that contains EOLs, fill bits etc.
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Key: PDFBOX-1086
URL: https://issues.apache.org/jira/browse/PDFBOX-1086
Project: PDFBox
Issue Type: Bug
Components: Parsing
Reporter: Jeremias Maerki
Assignee: Jeremias Maerki
The TIFFFaxDecoder class (originally coming from JAI via XML Graphics Commons) does not handle cases like EOLs between lines and in front. But the PDF CCITTFaxDecode filter needs to allow many different variants of the encoding. Apparently, TIFF has a relatively restricted way of encoding CCITT data, so TIFFFaxDecoder was not written to be as flexible as we need it. Ideally, PDFBox should handle anything that gets thrown at it.
It apprears that it would be rather difficult to retrofit TIFFFaxDecoder with the necessary flexibility. So, new decoders for T.4 and T.6 should probably be written.
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[jira] [Commented] (PDFBOX-1086) Error when decoding CCITT
compressed data that contains EOLs, fill bits etc.
Posted by "Jeremias Maerki (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/PDFBOX-1086?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13082391#comment-13082391 ]
Jeremias Maerki commented on PDFBOX-1086:
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As can be read in the associated SVN commit, I've replaced the Group3 1D decoder. The same problem can also occur with Group3 2D and Group4. So, eventually, PDFBox also needs implementations for these two. Especially Group4 is widely used which is why I'm keeping this issue open for the moment.
> Error when decoding CCITT compressed data that contains EOLs, fill bits etc.
> ----------------------------------------------------------------------------
>
> Key: PDFBOX-1086
> URL: https://issues.apache.org/jira/browse/PDFBOX-1086
> Project: PDFBox
> Issue Type: Bug
> Components: Parsing
> Reporter: Jeremias Maerki
> Assignee: Jeremias Maerki
>
> The TIFFFaxDecoder class (originally coming from JAI via XML Graphics Commons) does not handle cases like EOLs between lines and in front. But the PDF CCITTFaxDecode filter needs to allow many different variants of the encoding. Apparently, TIFF has a relatively restricted way of encoding CCITT data, so TIFFFaxDecoder was not written to be as flexible as we need it. Ideally, PDFBox should handle anything that gets thrown at it.
> It apprears that it would be rather difficult to retrofit TIFFFaxDecoder with the necessary flexibility. So, new decoders for T.4 and T.6 should probably be written.
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