in the Write method, around the same place as Winham's correction, replace the following 5 lines:
    padded[i] = buffer[i * bytes + 1] << 8 |
                buffer[i * bytes + 0];
    ...
    padded[i] = buffer[i * bytes + 2] << 16 |
                buffer[i * bytes + 1] << 8 |
                buffer[i * bytes + 0];
by:
    padded[i] = buffer[i * bytes + offset + 1] << 8 |
                buffer[i * bytes + offset];
...
    padded[i] = buffer[i * bytes + offset + 2] << 16 |
                buffer[i * bytes + offset + 1] << 8 |
                buffer[i * bytes + offset];