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Posted to dev@pdfbox.apache.org by "Maruan Sahyoun (Jira)" <ji...@apache.org> on 2026/04/24 10:02:00 UTC
[jira] [Comment Edited] (PDFBOX-6162) Reuse of symbol context not properly supported
[ https://issues.apache.org/jira/browse/PDFBOX-6162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18075963#comment-18075963 ]
Maruan Sahyoun edited comment on PDFBOX-6162 at 4/24/26 10:01 AM:
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[~tilman] this now works for me which brings us to a single failing file. The main issue apart from the initialization was the {{this.cx = sd.cx}} assignment so that the new {{CX}} instance corrupted the old one. The failure with {{EXRUNLENGTH}} was an accumulation while running trough the various segments. Took me quite a while to spot this unfortunately.
was (Author: msahyoun):
[~tilman] this now works for me which brings us to a single failing file. The main issue apart from the initialization was the {{this.cx = sd.cx}} assignment so that the new {{CX}} instance corrupted the old one. The failure with {{EXRUNLENGTH}} was an accumulation while running trough the various segments.
> Reuse of symbol context not properly supported
> ----------------------------------------------
>
> Key: PDFBOX-6162
> URL: https://issues.apache.org/jira/browse/PDFBOX-6162
> Project: PDFBox
> Issue Type: Sub-task
> Components: JBIG2
> Affects Versions: 3.0.4 JBIG2
> Reporter: Tilman Hausherr
> Priority: Major
> Attachments: bitmap-symbol-context-reuse.pdf
>
>
> .ArrayIndexOutOfBoundsException: Index 2 out of bounds for length 2
> at org.apache.pdfbox.jbig2.segments.SymbolDictionary.getToExportFlags(SymbolDictionary.java:898)
> at org.apache.pdfbox.jbig2.segments.SymbolDictionary.getDictionary(SymbolDictionary.java:467)
> at org.apache.pdfbox.jbig2.segments.SymbolDictionary.retrieveImportSymbols(SymbolDictionary.java:990)
> at org.apache.pdfbox.jbig2.segments.SymbolDictionary.setInSyms(SymbolDictionary.java:267)
> at org.apache.pdfbox.jbig2.segments.SymbolDictionary.parseHeader(SymbolDictionary.java:130)
> at org.apache.pdfbox.jbig2.segments.SymbolDictionary.init(SymbolDictionary.java:1025)
> at org.apache.pdfbox.jbig2.SegmentHeader.getSegmentData(SegmentHeader.java:380)
> Considering the name of the file, I assume this means we don't support the reuse of symbols correctly. The file has at least 4 different symbol segments. From what I see on
> https://github.com/SerenityOS/serenity/blob/master/Tests/LibGfx/test-inputs/jbig2/json/bitmap-symbol-context-reuse.json
> the text segment refers to the symbols of the 4 previous symbol segments, and the symbol segments indicate some logic to retain the symbols of previous segments, so one will have to investigate what happens.
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