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Make the decryptAscii helper function, in src/core/type1_parser.js, slightly more efficient

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By slicing the Uint8Array directly, rather than using the prototype and a `call` invocation, the runtime of `decryptAscii` is decreased slightly (~30% based on quick logging).
The `decryptAscii` function is still less efficient than `decrypt`, however ASCII encoded Type1 font programs are sufficiently rare that it probably doesn't matter much (we've only seen *two* examples, issue 4630 and 11740).
This commit is contained in:
Jonas Jenwald 2020-03-26 12:49:20 +01:00
parent 938d519192
commit 8770ca3014
2 changed files with 10 additions and 1 deletions
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2
src/core/type1_parser.js
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@ -437,7 +437,7 @@ var Type1Parser = (function Type1ParserClosure() {
r = ((value + r) * c1 + c2) & ((1 << 16) - 1); r = ((value + r) * c1 + c2) & ((1 << 16) - 1);
} }
} }
return Array.prototype.slice.call(decrypted, discardNumber, j); return decrypted.slice(discardNumber, j);
} }
function isSpecial(c) { function isSpecial(c) {

9
src/shared/compatibility.js
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@ -224,6 +224,15 @@ if (
Number.isInteger = require("core-js/es/number/is-integer.js"); Number.isInteger = require("core-js/es/number/is-integer.js");
})(); })();
// Provides support for TypedArray.prototype.slice in legacy browsers.
// Support: IE
(function checkTypedArraySlice() {
if (Uint8Array.prototype.slice) {
return;
}
require("core-js/es/typed-array/slice");
})();
// Support: IE, Safari<11, Chrome<63 // Support: IE, Safari<11, Chrome<63
(function checkPromise() { (function checkPromise() {
if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("IMAGE_DECODERS")) { if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("IMAGE_DECODERS")) {