proquint.mts

// Ported from https://github.com/deoxxa/proquint

const encodeConsonants = "bdfghjklmnprstvz".split("");
const encodeVowels = "aiou".split("");
const decodeConsonants = Object.fromEntries(encodeConsonants.map((x, i) => [x, i]));
const decodeVowels = Object.fromEntries(encodeVowels.map((x, i) => [x, i]));

export function encode(array: Uint16Array) {
	const view = new DataView(array.buffer);
	const bits = [];
	for (let i = 0; i < view.byteLength / 2; i++) {
		const n = view.getUint16(i * 2);
		const c1 = n & 0x0f;
		const v1 = (n >> 4) & 0x03;
		const c2 = (n >> 6) & 0x0f;
		const v2 = (n >> 10) & 0x03;
		const c3 = (n >> 12) & 0x0f;
		bits.push(
			encodeConsonants[c1] +
			encodeVowels[v1] +
			encodeConsonants[c2] +
			encodeVowels[v2] +
			encodeConsonants[c3]
		);
	}
	return bits.join("-");
}

export function decode(string: string) {
	const bits = string.split("-");
	const array = new Uint16Array(bits.length);
	const view = new DataView(array.buffer);
	for (let i = 0; i < bits.length; i++) {
		view.setUint16(
			i * 2,
			decodeConsonants[bits[i][0]] +
			(decodeVowels[bits[i][1]] << 4)  +
			(decodeConsonants[bits[i][2]] << 6)  +
			(decodeVowels[bits[i][3]] << 10) +
			(decodeConsonants[bits[i][4]] << 12)
		);
	}
	return array;
}