27 lines
1007 B
JavaScript
27 lines
1007 B
JavaScript
'use strict';
|
|
var globalThis = require('../internals/global-this');
|
|
var uncurryThis = require('../internals/function-uncurry-this');
|
|
|
|
var Uint8Array = globalThis.Uint8Array;
|
|
var SyntaxError = globalThis.SyntaxError;
|
|
var min = Math.min;
|
|
var stringMatch = uncurryThis(''.match);
|
|
|
|
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 segments = stringMatch(string, /.{2}/g);
|
|
var written = 0;
|
|
for (; written < maxLength; written++) {
|
|
var result = +('0x' + segments[written] + '0');
|
|
// eslint-disable-next-line no-self-compare -- NaN check
|
|
if (result !== result) {
|
|
throw new SyntaxError('String should only contain hex characters');
|
|
}
|
|
bytes[written] = result >> 4;
|
|
}
|
|
return { bytes: bytes, read: written << 1 };
|
|
};
|