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