otpauth/src/utils/encoding/latin1.js

One Time Password (HOTP/TOTP) library for Node.js, Deno and browsers

/**
 * Converts a Latin-1 string to an ArrayBuffer.
 * @param {string} str Latin-1 string.
 * @returns {ArrayBuffer} ArrayBuffer.
 */
const latin1ToBuf = (str) => {
	const buf = new ArrayBuffer(str.length);
	const arr = new Uint8Array(buf);

	for (let i = 0; i < str.length; i++) {
		arr[i] = str.charCodeAt(i) & 0xFF;
	}

	return buf;
};

/**
 * Converts an ArrayBuffer to a Latin-1 string.
 * @param {ArrayBuffer} buf ArrayBuffer.
 * @returns {string} Latin-1 string.
 */
const latin1FromBuf = (buf) => {
	const arr = new Uint8Array(buf);
	let str = '';

	for (let i = 0; i < arr.length; i++) {
		str += String.fromCharCode(arr[i]);
	}

	return str;
};

export { latin1ToBuf, latin1FromBuf };