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Allow skipping of errors when reading broken/corrupt ToUnicode data (issue 11549)

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This will allow font loading/parsing to continue, rather than immediately failing, when broken/corrupt CMap data is encountered.
This commit is contained in:
Jonas Jenwald 2020-01-30 13:13:51 +01:00
parent 517ccb7a39
commit 4c54395ff6
5 changed files with 51 additions and 26 deletions
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65
src/core/evaluator.js
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@ -2612,31 +2612,48 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
encoding: cmapObj,
fetchBuiltInCMap: this.fetchBuiltInCMap,
useCMap: null,
}).then(function(cmap) {
if (cmap instanceof IdentityCMap) {
return new IdentityToUnicodeMap(0, 0xffff);
}
var map = new Array(cmap.length);
// Convert UTF-16BE
// NOTE: cmap can be a sparse array, so use forEach instead of for(;;)
// to iterate over all keys.
cmap.forEach(function(charCode, token) {
var str = [];
for (var k = 0; k < token.length; k += 2) {
var w1 = (token.charCodeAt(k) << 8) | token.charCodeAt(k + 1);
if ((w1 & 0xf800) !== 0xd800) {
// w1 < 0xD800 || w1 > 0xDFFF
str.push(w1);
continue;
}
k += 2;
var w2 = (token.charCodeAt(k) << 8) | token.charCodeAt(k + 1);
str.push(((w1 & 0x3ff) << 10) + (w2 & 0x3ff) + 0x10000);
}).then(
function(cmap) {
if (cmap instanceof IdentityCMap) {
return new IdentityToUnicodeMap(0, 0xffff);
}
map[charCode] = String.fromCodePoint.apply(String, str);
});
return new ToUnicodeMap(map);
});
var map = new Array(cmap.length);
// Convert UTF-16BE
// NOTE: cmap can be a sparse array, so use forEach instead of
// `for(;;)` to iterate over all keys.
cmap.forEach(function(charCode, token) {
var str = [];
for (var k = 0; k < token.length; k += 2) {
var w1 = (token.charCodeAt(k) << 8) | token.charCodeAt(k + 1);
if ((w1 & 0xf800) !== 0xd800) {
// w1 < 0xD800 || w1 > 0xDFFF
str.push(w1);
continue;
}
k += 2;
var w2 = (token.charCodeAt(k) << 8) | token.charCodeAt(k + 1);
str.push(((w1 & 0x3ff) << 10) + (w2 & 0x3ff) + 0x10000);
}
map[charCode] = String.fromCodePoint.apply(String, str);
});
return new ToUnicodeMap(map);
},
reason => {
if (reason instanceof AbortException) {
return null;
}
if (this.options.ignoreErrors) {
// Error in the ToUnicode data -- sending unsupported feature
// notification and allow font parsing to continue.
this.handler.send("UnsupportedFeature", {
featureId: UNSUPPORTED_FEATURES.font,
});
warn(`readToUnicode - ignoring ToUnicode data: "${reason}".`);
return null;
}
throw reason;
}
);
}
return Promise.resolve(null);
},