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Fix reading PNG EXIF after C2PA data by duduxiong1024 · Pull Request #453 · exiftool/exiftool · GitHub

Fix reading PNG EXIF after C2PA data - #453

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duduxiong1024 wants to merge 1 commit into
exiftool:masterfrom
duduxiong1024:fix/png-c2pa-exif-offset-collision
Open

Fix reading PNG EXIF after C2PA data#453
duduxiong1024 wants to merge 1 commit into
exiftool:masterfrom
duduxiong1024:fix/png-c2pa-exif-offset-collision

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Summary

  • isolate processed-directory tracking for each embedded PNG chunk so relative offsets in C2PA/JUMBF and EXIF cannot collide
  • add regression coverage for both caBX-before-eXIf and eXIf-before-caBX ordering

Testing

  • PERL5LIB=lib prove t/*.t (114 files, 604 tests)
  • signed a PNG containing UserComment with c2patool 0.26.41 and verified the comment remains readable without warnings
  • verified the eXIf payload SHA-256 is unchanged by C2PA signing

Fixes #452

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Successfully merging this pull request may close these issues.

ExifTool fails to read EXIF metadata from a PNG when a C2PA caBX chunk appears before the PNG eXIf chunk

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