ltcode/dist/app/utils.js

Luby Transform Code implementation.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.intToBytes = intToBytes;
exports.intFromBytes = intFromBytes;
exports.concatUint8Arrays = concatUint8Arrays;
function intToBytes(input, size, order = "big") {
    if (size < 0) {
        throw new RangeError("Size must be non-negative");
    }
    const bytes = new Uint8Array(size);
    let n = input;
    if (order === "little") {
        for (let i = 0; i < size; i++) {
            bytes[i] = Number(n & BigInt(0xFF));
            n >>= BigInt(8);
        }
    }
    else { // "big"
        for (let i = size - 1; i >= 0; i--) {
            bytes[i] = Number(n & BigInt(0xFF));
            n >>= BigInt(8);
        }
    }
    return bytes;
}
function intFromBytes(buffer, order = "big") {
    let result = BigInt(0);
    if (order === "big") {
        for (const byte of buffer) {
            result = (result << BigInt(8)) | BigInt(byte);
        }
    }
    else { // "little"
        for (let i = buffer.length - 1; i >= 0; i--) {
            result = (result << BigInt(8)) | BigInt(buffer[i]);
        }
    }
    return result;
}
function concatUint8Arrays(arrays) {
    let totalLength = 0;
    for (const arr of arrays) {
        totalLength += arr.length;
    }
    const result = new Uint8Array(totalLength);
    let offset = 0;
    for (const arr of arrays) {
        result.set(arr, offset);
        offset += arr.length;
    }
    return result;
}