bitwise & doesn't work with bytes in kotlin

Question

I'm trying to write kotlin code like:

for (byte b : hash)        stringBuilder.append(String.format("%02x", b&0xff)); 

but I have nothing to do with the "&". I'm trying to use "b and 0xff" but it doesn't work. The bitwise "and" seems to work on Int, not byte.

java.lang.String.format("%02x", (b and 0xff)) 

it's ok to use

1 and 0xff 

Answer 1

Kolin provides bitwise operator-like infix functions available for Int and Long only.

So it's necessary to convert bytes to ints to perform bitwise ops:

val b : Byte = 127 val res = (b.toInt() and 0x0f).toByte() // evaluates to 15 

UPDATE: Since Kotlin 1.1 these operations are available directly on Byte.

From bitwiseOperations.kt:

@SinceKotlin("1.1")  public inline infix fun Byte.and(other: Byte): Byte = (this.toInt() and other.toInt()).toByte()