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

 */

    let _data = new Uint8Array(arr);

    function appendBytes(input) {

        let tmp;

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

            let hex_string = input.toString(16);

            tmp = new Uint8Array(hex_string.match(/.{1,2}/g).map(byte => parseInt(byte, 16)));

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

            tmp = new Uint8Array(input.length);

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

                tmp[i] = input.charCodeAt(i);

            }

        } else {

            tmp = new Uint8Array(input);

        }

        let new_uint8_arr = new Uint8Array(_data.length + tmp.length);

        new_uint8_arr.set(_data);

        new_uint8_arr.set(tmp, _data.length);

        _data = new_uint8_arr;

    };

    function finalize() {

        return _data;

    };

    function getLength() {

        return _data.length;

    }

    return {

        appendBytes: appendBytes,

        finalize: finalize,

        get: get,

        getLength: getLength,

    }