package xor

import "math"

/* (1) bitwise XOR between bytes
*
* @_left<byte>						Left operand
* @_right<byte>						Right operand
*
* @return out<byte>					Bitwise XOR result between _left and _right
*
---------------------------------------------------------*/
func Byte(_left byte, _right byte) byte {

	return _left ^ _right;

}


/* (2) bitwise XOR between Byte arrays
*
* @_left<byte[]>						Left operand
* @_right<byte[]>						Right operand
*
* @return out<byte[]>				Bitwise XOR result between _left and _right
*
* @@ NOTE @@
*	If an argument is smaller, it will be right-padded with null bytes (0x00)
*
---------------------------------------------------------*/
func ByteArray(_left []byte, _right []byte) []byte {

	/* (1) Process
	---------------------------------------------------------*/
	/* (1) Extract lengths */
	ll := len(_left)
	lr := len(_right)

	/* (2) Get max length */
	l := int(math.Max(float64(ll), float64(lr)))

	/* (3) Initialise 'out' */
	out := make([]byte, l, l)

	/* (2) Process bitwise XOR */
	for i := 0 ; i < l ; i++ {

		// 1. Out of range for _left
		if i >= ll {

			out[i] = _right[i];

		} else if i >= lr {

			out[i] = _left[i];

		} else {

			out[i] = Byte(_left[i], _right[i])

		}

	}

	return out

}