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https://issues.apache.org/jira/browse/PDFBOX-2177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14050906#comment-14050906
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John Hewson edited comment on PDFBOX-2177 at 7/3/14 12:22 AM:
--------------------------------------------------------------
This bug is due to incorrect handling of the local subroutines in the embedded
CFF font. This font uses multiple font dictionaries via the FDSelect mechanism,
however in CFFParser a call to CFFFont#setLocalSubrIndex() is made which
ignores the fact that the Subrs are stored in the Private dictionary (or
dictionaries, in this case). Instead setLocalSubrIndex stores the Subrs for
_just the last_ Private dict in the CFFFont. I've fixed that problem in
[r1607501|http://svn.apache.org/r1607501] by storing the Subrs in the relevant
Private dictionary.
However, there are still problems and we're still getting an
IndexOutOfBoundsException from Type2CharString#drawAlternatingCurve(). This is
because the wrong subroutine is being called, due to
CFFFont#getLocalSubrIndex() returning the wrong Private dictionary. As far as I
can tell there is a fairly substantial problem with the way that this mechanism
is implemented in FontBox: my understanding of the CFF spec is that the
FDSelect mechanism uses GIDs, however in CFFFont it uses CIDs, so we're looking
up the wrong value? If so, we need to first convert the CID to a GID, however I
can't even begin to make sense of the code in the fontbox.cff package. The
handling of CIDs/SIDs/GIDs is... confusing.
was (Author: jahewson):
This bug is due to incorrect handling of the local subroutines in the embedded
CFF font. This font uses multiple font dictionaries via the FDSelect mechanism,
however in CFFParser a call to CFFFont#setLocalSubrIndex() is made which
ignores the fact that the Subrs are stored in the Private dictionary (or
dictionaries, in this case). Instead setLocalSubrIndex stores the Subrs for
_just the last_ Private dict in the CFFFont. I've fixed that problem in
[r1607501|http://svn.apache.org/r1607501] by storing the Subrs in the relevant
Private dictionary.
However, there are still problems and we're still getting an
IndexOutOfBoundsException from Type2CharString#drawAlternatingCurve(). This is
because the wrong subroutine is being called, due to
CFFFont#getLocalSubrIndex() returning the wrong Private dictionary. As far as I
can tell there is a fairly substantial problem with the way that this mechanism
is implemented in FontBox: my understanding of the CFF spec is that the
FDSelect mechanism uses GIDs, however in CFFFont it uses CIDs, so we're looking
up the wrong value? So we need to first convert the CID to a GID, however I
can't even begin to make sense of the code in the fontbox.cff package. The
handling of CIDs/SIDs/GIDs is... confusing.
> IndexOutOfBoundsException reading embedded OpenType font
> --------------------------------------------------------
>
> Key: PDFBOX-2177
> URL: https://issues.apache.org/jira/browse/PDFBOX-2177
> Project: PDFBox
> Issue Type: Bug
> Components: FontBox
> Affects Versions: 2.0.0
> Reporter: simon steiner
> Attachments: out.7z
>
>
> java -jar ~/pdf-box-svn/app/target/pdfbox-app-2.0.0-SNAPSHOT.jar PDFToImage
> opentype.pdf
> PDFToImage failed with the following exception:
> java.lang.IndexOutOfBoundsException: Index: 2, Size: 2
> at java.util.SubList.rangeCheck(AbstractList.java:755)
> at java.util.SubList.get(AbstractList.java:639)
> at java.util.Collections$SynchronizedList.get(Collections.java:2477)
> at
> org.apache.fontbox.cff.Type2CharString.drawCurve(Type2CharString.java:356)
> 7zip attachment
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