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- 'use strict';
- var globalThis = require('../internals/global-this');
- var uncurryThis = require('../internals/function-uncurry-this');
-
- var Uint8Array = globalThis.Uint8Array;
- var SyntaxError = globalThis.SyntaxError;
- var parseInt = globalThis.parseInt;
- var min = Math.min;
- var NOT_HEX = /[^\da-f]/i;
- var exec = uncurryThis(NOT_HEX.exec);
- var stringSlice = uncurryThis(''.slice);
-
- module.exports = function (string, into) {
- var stringLength = string.length;
- if (stringLength % 2 !== 0) throw new SyntaxError('String should be an even number of characters');
- var maxLength = into ? min(into.length, stringLength / 2) : stringLength / 2;
- var bytes = into || new Uint8Array(maxLength);
- var read = 0;
- var written = 0;
- while (written < maxLength) {
- var hexits = stringSlice(string, read, read += 2);
- if (exec(NOT_HEX, hexits)) throw new SyntaxError('String should only contain hex characters');
- bytes[written++] = parseInt(hexits, 16);
- }
- return { bytes: bytes, read: read };
- };
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