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https://issues.apache.org/jira/browse/PDFBOX-5143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17310756#comment-17310756
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Tilman Hausherr commented on PDFBOX-5143:
-----------------------------------------
The file gs-bugzilla688870.pdf from PDFBOX-3000 (and some other files) brings
this when rendering:
{code}
java.lang.UnsupportedOperationException
at java.util.Collections$UnmodifiableList.set(Collections.java:1311)
at org.apache.fontbox.cff.CFFParser.concatenateMatrix(CFFParser.java:612)
at org.apache.fontbox.cff.CFFParser.parseFont(CFFParser.java:580)
at org.apache.fontbox.cff.CFFParser.parse(CFFParser.java:126)
at org.apache.fontbox.cff.CFFParser.parse(CFFParser.java:77)
{code}
It is somehow related to \{{getOperands}} returning a
\{{Collections.unmodifiableList(operands)}}.
> Refactor/Simplify CFF parsing
> -----------------------------
>
> Key: PDFBOX-5143
> URL: https://issues.apache.org/jira/browse/PDFBOX-5143
> Project: PDFBox
> Issue Type: Improvement
> Components: FontBox
> Affects Versions: 3.0.0 PDFBox
> Reporter: Andreas Lehmkühler
> Assignee: Andreas Lehmkühler
> Priority: Major
>
> The classes used for the parsing of CFF-based fonts have some room for
> improvements w.r.t. the memory footprint, the complexity of the code and the
> test coverage.
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