rochars / endianness

function endianness(bytes, offset) {

    let len = bytes.length;

    let i = 0;

    while (i < len) {

        swap(bytes, offset, i);

        i += offset;

    }

}

/**

 * Swap the endianness of a unit of information in a byte array.

 * The original array is modified in-place.

 * @param {!Array<number>|!Array<string>|Uint8Array} bytes The bytes.

 * @param {number} offset The number of bytes of the unit of information.

 * @param {number} index The start index of the unit of information.

 */

function swap(bytes, offset, index) {

    let x = 0;

    let y = offset - 1;

    let limit = parseInt(offset / 2, 10);

    while(x < limit) {

        bytes[index + x] = bytes[index + y];

        bytes[index + y] = swap;

        x++;

        y--;

    }

}

module.exports = endianness;