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woff2_decompress fails to unpack superOTC #141

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davelab6 opened this issue May 18, 2021 · 1 comment

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davelab6 commented May 18, 2021 •

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https://twitter.com/ken_lunde/status/1394496314197508103?s=19

Interestingly, @googlefonts’ woff2 project can convert the #SourceHanSans Super OTC into a WOFF2 Collection by executing woff2_compress, but executing woff2_decompress fails to convert the resulting WOFF2 Collection back into an OpenType Collection.

Related to #37

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davelab6 commented May 18, 2021

The woff_decompress silent failure is due to kDefaultMaxSize being set to 30 × 1024 × 1024, meaning 30MB, and this limit applies to the uncompressed size of the WOFF2. I built two TTCs with sizes just under and just over this threshold: the former succeeded and the latter failed.

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