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Support multi-byte ToUnicode entries, when using predefined CMaps (issue 16176)

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Hopefully this makes sense, since we already "create" multi-byte ToUnicode entries in other cases (see e.g. the `getNormalizedUnicodes` table).
This commit is contained in:
Jonas Jenwald 2023-03-21 12:24:21 +01:00
parent b1e0253f29
commit d4bcfe8c16
4 changed files with 27 additions and 4 deletions
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12
src/core/evaluator.js
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@ -3632,7 +3632,8 @@ class PartialEvaluator {
fetchBuiltInCMap: this._fetchBuiltInCMapBound,
useCMap: null,
});
const toUnicode = [];
const toUnicode = [],
buf = [];
properties.cMap.forEach(function (charcode, cid) {
if (cid > 0xffff) {
throw new FormatError("Max size of CID is 65,535");
@ -3641,9 +3642,12 @@ class PartialEvaluator {
// obtained in step (d), producing a Unicode value.
const ucs2 = ucs2CMap.lookup(cid);
if (ucs2) {
toUnicode[charcode] = String.fromCharCode(
(ucs2.charCodeAt(0) << 8) + ucs2.charCodeAt(1)
);
buf.length = 0;
// Support multi-byte entries (fixes issue16176.pdf).
for (let i = 0, ii = ucs2.length; i < ii; i += 2) {
buf.push((ucs2.charCodeAt(i) << 8) + ucs2.charCodeAt(i + 1));
}
toUnicode[charcode] = String.fromCharCode(...buf);
}
});
return new ToUnicodeMap(toUnicode);