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Posted to dev@pdfbox.apache.org by "Andreas Lehmkühler (JIRA)" <ji...@apache.org> on 2013/08/15 09:32:50 UTC
[jira] [Commented] (PDFBOX-1694) Bug in
org.apache.pdfbox.io.Ascii85InputStream
[ https://issues.apache.org/jira/browse/PDFBOX-1694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13740781#comment-13740781 ]
Andreas Lehmkühler commented on PDFBOX-1694:
--------------------------------------------
I understand your point and totally agree that the current implementation isn't correct. But I can't find any pdf having an issue with it. Even your sample pdf doesn't throw any exception or anything similar. Can you confirm that?
> Bug in org.apache.pdfbox.io.Ascii85InputStream
> ----------------------------------------------
>
> Key: PDFBOX-1694
> URL: https://issues.apache.org/jira/browse/PDFBOX-1694
> Project: PDFBox
> Issue Type: Bug
> Affects Versions: 1.7.1
> Environment: Any
> Reporter: Peter Costello
> Labels: Ascii85Decode
> Original Estimate: 0.5h
> Remaining Estimate: 0.5h
>
> Method 'org.apache.pdfbox.io.Ascii85InputStream.read()' has bug when reading final set of char that are not modulo-4.
> Test file="www.mzweb.com.br/grupobimbo/web/arquivos/Bimbo_Historia_20070409_Esp.pdf".
> On page#0 there is a dictionary "323 0 obj << /Length 1492 /Filter [/Ascii85Decode /FlateDecode]>>"
> Last set of bytes to decode is "%f" or 0x25, 0x66
> Ascii85InputStream pads this to "%f~!!" and correctly generates the final byte 0x0f.
> Including the '~' end-of-data char in the padding is a major bug.
> If the final padding were "%f!!!", the final byte decoded would be 0x0e (which is wrong).
> The correct padding is the 'u' char, or "%fuuu" (See http://en.wikipedia.org/wiki/Ascii85)
> This is a quick fix.
> The PDF files for corporate website "Grupo Bimbo" include lots of examples using Ascii85Decode/
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