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mirrors/pdf.js

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Ensure that `MurmurHash3_64.update` handles `ArrayBuffer` input correctly, to avoid hash-collisions (issue 12533) Different fonts incorrectly end up with *identical* hashes, despite having different /ToUnicode data. The issue, and it's very interesting that we've apparently not seen it before, appears to be caused by the fact that different /ToUnicode entries share the *same* underlying `ArrayBuffer`, which thus becomes problematic at the `const dataUint32 = new Uint32Array(data.buffer, 0, blockCounts);` line. The simplest solution thus seem to be to just *copy* the input, when it's an `ArrayBuffer`, rather than using it as-is. (Note that if we'd stringified the input, when calling `MurmurHash3_64.update`, the issue would also have been fixed. In this case, we're already creating an unique TypedArray.)

2020-10-26 16:20:55 +01:00

https://web.archive.org/web/20201026152003/https://www.mass.gov/doc/covid-19-dashboard-october-25-2020/download