@gandlaf21/bc-ur/dist/lib/es6/utils.js

A JS implementation of the Uniform Resources (UR) specification from Blockchain Commons

import { Buffer } from "buffer";
import { sha256 } from "@noble/hashes/sha256";
var CRC_TABLE = function () {
    var c;
    var crcTable = [];
    for (var n = 0; n < 256; n++) {
        c = n;
        for (var k = 0; k < 8; k++) {
            c = ((c & 1) ? (0xEDB88320 ^ (c >>> 1)) : (c >>> 1));
        }
        crcTable[n] = c;
    }
    return crcTable;
}();
var crc32 = function (message) {
    var crc = 0 ^ (-1);
    for (var i = 0; i < message.length; i++) {
        crc = (crc >>> 8) ^ CRC_TABLE[(crc ^ message[i]) & 0xFF];
    }
    return (crc ^ (-1)) >>> 0;
};
export var sha256Hash = function (data) { return Buffer.from(sha256(data)); };
export var partition = function (s, n) { return s.match(new RegExp('.{1,' + n + '}', 'g')) || [s]; };
export var split = function (s, length) { return [s.slice(0, -length), s.slice(-length)]; };
export var getCRC = function (message) { return crc32(message); };
export var getCRCHex = function (message) { return crc32(message).toString(16).padStart(8, '0'); };
export var toUint32 = function (number) { return number >>> 0; };
export var intToBytes = function (num) {
    var arr = new ArrayBuffer(4); // an Int32 takes 4 bytes
    var view = new DataView(arr);
    view.setUint32(0, num, false); // byteOffset = 0; litteEndian = false
    return Buffer.from(arr);
};
export var isURType = function (type) {
    return type.split('').every(function (_, index) {
        var c = type.charCodeAt(index);
        if ('a'.charCodeAt(0) <= c && c <= 'z'.charCodeAt(0))
            return true;
        if ('0'.charCodeAt(0) <= c && c <= '9'.charCodeAt(0))
            return true;
        if (c === '-'.charCodeAt(0))
            return true;
        return false;
    });
};
export var hasPrefix = function (s, prefix) { return s.indexOf(prefix) === 0; };
export var arraysEqual = function (ar1, ar2) {
    if (ar1.length !== ar2.length) {
        return false;
    }
    return ar1.every(function (el) { return ar2.includes(el); });
};
/**
 * Checks if ar1 contains all elements of ar2
 * @param ar1 the outer array
 * @param ar2 the array to be contained in ar1
 */
export var arrayContains = function (ar1, ar2) {
    return ar2.every(function (v) { return ar1.includes(v); });
};
/**
 * Returns the difference array of  `ar1` - `ar2`
 */
export var setDifference = function (ar1, ar2) {
    return ar1.filter(function (x) { return ar2.indexOf(x) < 0; });
};
export var bufferXOR = function (a, b) {
    var length = Math.max(a.length, b.length);
    var buffer = Buffer.allocUnsafe(length);
    for (var i = 0; i < length; ++i) {
        buffer[i] = a[i] ^ b[i];
    }
    return buffer;
};
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