29 lines
1.1 KiB
JavaScript
29 lines
1.1 KiB
JavaScript
'use strict';
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var $ = require('../internals/export');
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var global = require('../internals/global');
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var uncurryThis = require('../internals/function-uncurry-this');
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var aString = require('../internals/a-string');
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var Uint8Array = global.Uint8Array;
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var SyntaxError = global.SyntaxError;
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var parseInt = global.parseInt;
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var NOT_HEX = /[^\da-f]/i;
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var exec = uncurryThis(NOT_HEX.exec);
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var stringSlice = uncurryThis(''.slice);
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// `Uint8Array.fromHex` method
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// https://github.com/tc39/proposal-arraybuffer-base64
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if (Uint8Array) $({ target: 'Uint8Array', stat: true, forced: true }, {
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fromHex: function fromHex(string) {
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aString(string);
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var stringLength = string.length;
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if (stringLength % 2) throw new SyntaxError('String should have an even number of characters');
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if (exec(NOT_HEX, string)) throw new SyntaxError('String should only contain hex characters');
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var result = new Uint8Array(stringLength / 2);
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for (var i = 0; i < stringLength; i += 2) {
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result[i / 2] = parseInt(stringSlice(string, i, i + 2), 16);
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}
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return result;
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}
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});
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