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https://issues.apache.org/jira/browse/PDFBOX-2923?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Petras updated PDFBOX-2923:
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Attachment: sample-a2b-acrosigned_B.pdf
The PDF file for which Preflight fails due to the bug
> CFFParser parser treats CIDFont's charset data as SID
> -----------------------------------------------------
>
> Key: PDFBOX-2923
> URL: https://issues.apache.org/jira/browse/PDFBOX-2923
> Project: PDFBox
> Issue Type: Bug
> Components: FontBox
> Affects Versions: 1.8.10
> Reporter: Petras
> Attachments: MyriadPro-Regular.cff, Patch_to_fix_PDFBOX-2923.patch,
> sample-a2b-acrosigned_B.pdf
>
>
> As stated in Compact Font File specification:
> {quote}
> The charset data, although in the same format as non-CIDFonts, will represent
> CIDs rather than SIDs, i.e. charstrings are “named” by CIDs in a CIDFont.
> {quote}
> Unfortunately, {{CFFParser}} does not consider this specific and always treat
> charset data as SID: is looking for SID referenced text in _String INDEX_
> structure. Since such SID-indexed string does not exist there, it sets the
> name of the glyph to "{{.ndef}}".
> Consequently, {{CFFParser}} fails to register correct charstrings, as it
> associates glyph names to them using a map. As there can be several
> charstrings, only the last charstring entry is retained.
> Then also {{CFFFont.getWidth()}} method fails to return correct width of the
> given CID as correct link between CID and charstring is lost.
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