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Crash when reading Adobe-obfuscated font when publication identifier is empty #90

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olivierkorner opened this issue May 21, 2021 · 2 comments · Fixed by readium/r2-streamer-swift#213
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Crash when reading Adobe-obfuscated font when publication identifier is empty #90

olivierkorner opened this issue May 21, 2021 · 2 comments · Fixed by readium/r2-streamer-swift#213
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@olivierkorner
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olivierkorner commented May 21, 2021 •
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The Adobe font obfuscation algorithm key is built using the publication identifier.

If it is empty, or just urn:uuid:, the deobfuscation will crash with a "Division by zero" error because the key is empty:
https://github.com/readium/r2-streamer-swift/blob/4067b31f7e88306d66bcef253b5fb538b7b0be68/r2-streamer-swift/Parser/EPUB/Resource%20Transformers/EPUBDeobfuscator.swift#L69

If the key is empty, the deobfuscator should just return the data with transformation.

I have an EPUB to test the issue that I can send privately but not share here.
@mickael-menu
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mickael-menu commented May 25, 2021 •
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Thanks Olivier, could you send me the EPUB on Slack?

The toolkit should not crash in this case, but the font won't be deobfuscated. Is it an error in the publication that the font is declared obfuscated, or that the publication identifier is missing?

(Note to self: GEF2016.epub)

@mickael-menu mickael-menu added the bug Something isn't working label May 25, 2021
@olivierkorner
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olivierkorner commented May 25, 2021 •
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The publication identifier is missing (actually, it is set to urn:uuid:). Note that it looks like the font is not obfuscated in the EPUB.

@mickael-menu mickael-menu mentioned this issue Jun 25, 2021
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@mickael-menu mickael-menu transferred this issue from readium/r2-streamer-swift Aug 12, 2022
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Fix crash when reading obfuscated resources with an empty publication ID readium/r2-streamer-swift
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@olivierkorner @mickael-menu