Endianness Reverse

using System.IO;
using System;

class Program
{
    static byte[] EndiannessReverse(byte[] data, int chunk_size) {
        byte[] rev  = new byte[data.Length];

        for(int i = 0; i < data.Length; i++) {
            int chunk_idx = i / chunk_size;
            int byte_pos  = (chunk_size - 1) - (i % chunk_size);
            int byte_idx  = chunk_idx * chunk_size;
            rev[i] = data[byte_idx + byte_pos];
        }

        return rev;
    }

    static void Main()
    {
        byte chunk_size = 4;

        byte[] data = {0xF5, 0xA2, 0x64, 0x22, 0x78, 0x41, 0x80, 0xCB};
        byte[] rev  = EndiannessReverse(data, chunk_size);

        Console.WriteLine(BitConverter.ToString(data));
        Console.WriteLine(BitConverter.ToString(rev));
    }
}