Dead4W / jsAesCrypt

/**

 * binary array stream object

 *

 *

 * @return The BinaryStream object.

 *

 * @static

 *

 * @example

 *     var BinaryStream = BinaryStream([1,2,3]);

 *     BinaryStream.appendBytes([4,5,6]);

 *     BinaryStream.appendBytes("\x07\x08\x09");

 *     console.log(BinaryStream.finalize()) // returns Uint8Array [1,2,3,4,5,6,7,8,9]

 *

 * @param arr origin array

 */

(function () {

    aesCrypt.BinaryStream = function(arr = []) {

        let _data = new Uint8Array(arr);

        function appendBytes(input) {

            let tmp = [];

            if (typeof (input) == "number") {

                let hex = input.toString(16);

                tmp = hex.match(/.{1,2}/g).map((byte) => parseInt(byte, 16));

            } else if (typeof (input) == "string") {

                for (let i = 0; i < input.length; i ++) {

                    tmp.push(input.charCodeAt(i));

                }

            } else {

                tmp = input;

            }

            tmp = new Uint8Array(tmp);

            let tmpArr = new Uint8Array(_data.length + tmp.length);

            tmpArr.set(_data);

            tmpArr.set(tmp, _data.length);

            _data = tmpArr;

        }

        function finalize() {

            return _data;

        }

        return {

            appendBytes,

            finalize,

            getLength,

        };

    };