'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 };
|
};
|
