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Filename : index.es.js
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/*!
 * MIT License
 * 
 * Copyright (c) 2017-2022 Peculiar Ventures, LLC
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 * 
 */

const ARRAY_BUFFER_NAME = "[object ArrayBuffer]";
class BufferSourceConverter {
    static isArrayBuffer(data) {
        return Object.prototype.toString.call(data) === ARRAY_BUFFER_NAME;
    }
    static toArrayBuffer(data) {
        if (this.isArrayBuffer(data)) {
            return data;
        }
        if (data.byteLength === data.buffer.byteLength) {
            return data.buffer;
        }
        if (data.byteOffset === 0 && data.byteLength === data.buffer.byteLength) {
            return data.buffer;
        }
        return this.toUint8Array(data.buffer)
            .slice(data.byteOffset, data.byteOffset + data.byteLength)
            .buffer;
    }
    static toUint8Array(data) {
        return this.toView(data, Uint8Array);
    }
    static toView(data, type) {
        if (data.constructor === type) {
            return data;
        }
        if (this.isArrayBuffer(data)) {
            return new type(data);
        }
        if (this.isArrayBufferView(data)) {
            return new type(data.buffer, data.byteOffset, data.byteLength);
        }
        throw new TypeError("The provided value is not of type '(ArrayBuffer or ArrayBufferView)'");
    }
    static isBufferSource(data) {
        return this.isArrayBufferView(data)
            || this.isArrayBuffer(data);
    }
    static isArrayBufferView(data) {
        return ArrayBuffer.isView(data)
            || (data && this.isArrayBuffer(data.buffer));
    }
    static isEqual(a, b) {
        const aView = BufferSourceConverter.toUint8Array(a);
        const bView = BufferSourceConverter.toUint8Array(b);
        if (aView.length !== bView.byteLength) {
            return false;
        }
        for (let i = 0; i < aView.length; i++) {
            if (aView[i] !== bView[i]) {
                return false;
            }
        }
        return true;
    }
    static concat(...args) {
        let buffers;
        if (Array.isArray(args[0]) && !(args[1] instanceof Function)) {
            buffers = args[0];
        }
        else if (Array.isArray(args[0]) && args[1] instanceof Function) {
            buffers = args[0];
        }
        else {
            if (args[args.length - 1] instanceof Function) {
                buffers = args.slice(0, args.length - 1);
            }
            else {
                buffers = args;
            }
        }
        let size = 0;
        for (const buffer of buffers) {
            size += buffer.byteLength;
        }
        const res = new Uint8Array(size);
        let offset = 0;
        for (const buffer of buffers) {
            const view = this.toUint8Array(buffer);
            res.set(view, offset);
            offset += view.length;
        }
        if (args[args.length - 1] instanceof Function) {
            return this.toView(res, args[args.length - 1]);
        }
        return res.buffer;
    }
}

const STRING_TYPE = "string";
const HEX_REGEX = /^[0-9a-f]+$/i;
const BASE64_REGEX = /^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=)?$/;
const BASE64URL_REGEX = /^[a-zA-Z0-9-_]+$/;
class Utf8Converter {
    static fromString(text) {
        const s = unescape(encodeURIComponent(text));
        const uintArray = new Uint8Array(s.length);
        for (let i = 0; i < s.length; i++) {
            uintArray[i] = s.charCodeAt(i);
        }
        return uintArray.buffer;
    }
    static toString(buffer) {
        const buf = BufferSourceConverter.toUint8Array(buffer);
        let encodedString = "";
        for (let i = 0; i < buf.length; i++) {
            encodedString += String.fromCharCode(buf[i]);
        }
        const decodedString = decodeURIComponent(escape(encodedString));
        return decodedString;
    }
}
class Utf16Converter {
    static toString(buffer, littleEndian = false) {
        const arrayBuffer = BufferSourceConverter.toArrayBuffer(buffer);
        const dataView = new DataView(arrayBuffer);
        let res = "";
        for (let i = 0; i < arrayBuffer.byteLength; i += 2) {
            const code = dataView.getUint16(i, littleEndian);
            res += String.fromCharCode(code);
        }
        return res;
    }
    static fromString(text, littleEndian = false) {
        const res = new ArrayBuffer(text.length * 2);
        const dataView = new DataView(res);
        for (let i = 0; i < text.length; i++) {
            dataView.setUint16(i * 2, text.charCodeAt(i), littleEndian);
        }
        return res;
    }
}
class Convert {
    static isHex(data) {
        return typeof data === STRING_TYPE
            && HEX_REGEX.test(data);
    }
    static isBase64(data) {
        return typeof data === STRING_TYPE
            && BASE64_REGEX.test(data);
    }
    static isBase64Url(data) {
        return typeof data === STRING_TYPE
            && BASE64URL_REGEX.test(data);
    }
    static ToString(buffer, enc = "utf8") {
        const buf = BufferSourceConverter.toUint8Array(buffer);
        switch (enc.toLowerCase()) {
            case "utf8":
                return this.ToUtf8String(buf);
            case "binary":
                return this.ToBinary(buf);
            case "hex":
                return this.ToHex(buf);
            case "base64":
                return this.ToBase64(buf);
            case "base64url":
                return this.ToBase64Url(buf);
            case "utf16le":
                return Utf16Converter.toString(buf, true);
            case "utf16":
            case "utf16be":
                return Utf16Converter.toString(buf);
            default:
                throw new Error(`Unknown type of encoding '${enc}'`);
        }
    }
    static FromString(str, enc = "utf8") {
        if (!str) {
            return new ArrayBuffer(0);
        }
        switch (enc.toLowerCase()) {
            case "utf8":
                return this.FromUtf8String(str);
            case "binary":
                return this.FromBinary(str);
            case "hex":
                return this.FromHex(str);
            case "base64":
                return this.FromBase64(str);
            case "base64url":
                return this.FromBase64Url(str);
            case "utf16le":
                return Utf16Converter.fromString(str, true);
            case "utf16":
            case "utf16be":
                return Utf16Converter.fromString(str);
            default:
                throw new Error(`Unknown type of encoding '${enc}'`);
        }
    }
    static ToBase64(buffer) {
        const buf = BufferSourceConverter.toUint8Array(buffer);
        if (typeof btoa !== "undefined") {
            const binary = this.ToString(buf, "binary");
            return btoa(binary);
        }
        else {
            return Buffer.from(buf).toString("base64");
        }
    }
    static FromBase64(base64) {
        const formatted = this.formatString(base64);
        if (!formatted) {
            return new ArrayBuffer(0);
        }
        if (!Convert.isBase64(formatted)) {
            throw new TypeError("Argument 'base64Text' is not Base64 encoded");
        }
        if (typeof atob !== "undefined") {
            return this.FromBinary(atob(formatted));
        }
        else {
            return new Uint8Array(Buffer.from(formatted, "base64")).buffer;
        }
    }
    static FromBase64Url(base64url) {
        const formatted = this.formatString(base64url);
        if (!formatted) {
            return new ArrayBuffer(0);
        }
        if (!Convert.isBase64Url(formatted)) {
            throw new TypeError("Argument 'base64url' is not Base64Url encoded");
        }
        return this.FromBase64(this.Base64Padding(formatted.replace(/\-/g, "+").replace(/\_/g, "/")));
    }
    static ToBase64Url(data) {
        return this.ToBase64(data).replace(/\+/g, "-").replace(/\//g, "_").replace(/\=/g, "");
    }
    static FromUtf8String(text, encoding = Convert.DEFAULT_UTF8_ENCODING) {
        switch (encoding) {
            case "ascii":
                return this.FromBinary(text);
            case "utf8":
                return Utf8Converter.fromString(text);
            case "utf16":
            case "utf16be":
                return Utf16Converter.fromString(text);
            case "utf16le":
            case "usc2":
                return Utf16Converter.fromString(text, true);
            default:
                throw new Error(`Unknown type of encoding '${encoding}'`);
        }
    }
    static ToUtf8String(buffer, encoding = Convert.DEFAULT_UTF8_ENCODING) {
        switch (encoding) {
            case "ascii":
                return this.ToBinary(buffer);
            case "utf8":
                return Utf8Converter.toString(buffer);
            case "utf16":
            case "utf16be":
                return Utf16Converter.toString(buffer);
            case "utf16le":
            case "usc2":
                return Utf16Converter.toString(buffer, true);
            default:
                throw new Error(`Unknown type of encoding '${encoding}'`);
        }
    }
    static FromBinary(text) {
        const stringLength = text.length;
        const resultView = new Uint8Array(stringLength);
        for (let i = 0; i < stringLength; i++) {
            resultView[i] = text.charCodeAt(i);
        }
        return resultView.buffer;
    }
    static ToBinary(buffer) {
        const buf = BufferSourceConverter.toUint8Array(buffer);
        let res = "";
        for (let i = 0; i < buf.length; i++) {
            res += String.fromCharCode(buf[i]);
        }
        return res;
    }
    static ToHex(buffer) {
        const buf = BufferSourceConverter.toUint8Array(buffer);
        let result = "";
        const len = buf.length;
        for (let i = 0; i < len; i++) {
            const byte = buf[i];
            if (byte < 16) {
                result += "0";
            }
            result += byte.toString(16);
        }
        return result;
    }
    static FromHex(hexString) {
        let formatted = this.formatString(hexString);
        if (!formatted) {
            return new ArrayBuffer(0);
        }
        if (!Convert.isHex(formatted)) {
            throw new TypeError("Argument 'hexString' is not HEX encoded");
        }
        if (formatted.length % 2) {
            formatted = `0${formatted}`;
        }
        const res = new Uint8Array(formatted.length / 2);
        for (let i = 0; i < formatted.length; i = i + 2) {
            const c = formatted.slice(i, i + 2);
            res[i / 2] = parseInt(c, 16);
        }
        return res.buffer;
    }
    static ToUtf16String(buffer, littleEndian = false) {
        return Utf16Converter.toString(buffer, littleEndian);
    }
    static FromUtf16String(text, littleEndian = false) {
        return Utf16Converter.fromString(text, littleEndian);
    }
    static Base64Padding(base64) {
        const padCount = 4 - (base64.length % 4);
        if (padCount < 4) {
            for (let i = 0; i < padCount; i++) {
                base64 += "=";
            }
        }
        return base64;
    }
    static formatString(data) {
        return (data === null || data === void 0 ? void 0 : data.replace(/[\n\r\t ]/g, "")) || "";
    }
}
Convert.DEFAULT_UTF8_ENCODING = "utf8";

function assign(target, ...sources) {
    const res = arguments[0];
    for (let i = 1; i < arguments.length; i++) {
        const obj = arguments[i];
        for (const prop in obj) {
            res[prop] = obj[prop];
        }
    }
    return res;
}
function combine(...buf) {
    const totalByteLength = buf.map((item) => item.byteLength).reduce((prev, cur) => prev + cur);
    const res = new Uint8Array(totalByteLength);
    let currentPos = 0;
    buf.map((item) => new Uint8Array(item)).forEach((arr) => {
        for (const item2 of arr) {
            res[currentPos++] = item2;
        }
    });
    return res.buffer;
}
function isEqual(bytes1, bytes2) {
    if (!(bytes1 && bytes2)) {
        return false;
    }
    if (bytes1.byteLength !== bytes2.byteLength) {
        return false;
    }
    const b1 = new Uint8Array(bytes1);
    const b2 = new Uint8Array(bytes2);
    for (let i = 0; i < bytes1.byteLength; i++) {
        if (b1[i] !== b2[i]) {
            return false;
        }
    }
    return true;
}

export { BufferSourceConverter, Convert, assign, combine, isEqual };