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https://issues.apache.org/jira/browse/PDFBOX-1655?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andreas Lehmkühler reassigned PDFBOX-1655:
------------------------------------------
Assignee: Andreas Lehmkühler
> Wasted work (or incorrect behavior) in PDCIDFontType2Font.readCIDToGIDMapping
> -----------------------------------------------------------------------------
>
> Key: PDFBOX-1655
> URL: https://issues.apache.org/jira/browse/PDFBOX-1655
> Project: PDFBox
> Issue Type: Bug
> Components: PDModel
> Affects Versions: 1.8.2
> Environment: any
> Reporter: Adrian Nistor
> Assignee: Andreas Lehmkühler
> Labels: patch, performance
> Attachments: patch.diff
>
>
> The problem appears in version 1.8.2 and in revision 1497941. I
> attached a two-line patch (patch.diff) that fixes it.
> In method "PDCIDFontType2Font.readCIDToGIDMapping", the loop:
> "for(int offset = 0;offset < numberOfInts;offset++)"
> keeps overriding "cid2gid[index]" with "getCodeFromArray(mapAsBytes,
> offset, 2)", where "index" does not change in the loop ("index" is
> always "0"). Therefore, only the last written value is visible out of
> the loop and all the previous writes and iterations are not necessary.
> The patch iterates from the end of the loop and breaks the first time
> when "cid2gid[index]" is set. The code can be further simplified, but
> I leave it like this to make the patch easy to follow.
> My patch preserves the original code behavior, but note that the
> original code (not the patch) may be incorrect to start with: maybe
> the code is not supposed to keep overriding "cid2gid[index]" (with
> "index" never changing in the loop, with value "0" all the time), but
> rather to also change "index". Maybe the code was supposed to be
> something like "cid2gid[index++]".
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