com.diozero.util.BitManipulation Maven / Gradle / Ivy
package com.diozero.util;
/*
* #%L
* Organisation: diozero
* Project: Device I/O Zero - Core
* Filename: BitManipulation.java
*
* This file is part of the diozero project. More information about this project
* can be found at http://www.diozero.com/
* %%
* Copyright (C) 2016 - 2021 diozero
* %%
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
* #L%
*/
public class BitManipulation {
public static byte setBitValue(byte value, boolean on, int bit) {
byte mask = getBitMask(bit);
byte new_value = value;
if (on) {
new_value |= mask;
} else {
new_value &= ~mask;
}
return new_value;
}
public static byte getBitMask(int ... bits) {
byte mask = 0;
for (int bit : bits) {
mask |= getBitMask(bit);
}
return mask;
}
public static byte getBitMask(int bit) {
if (bit > 7) {
throw new IllegalArgumentException("Bit (" + bit + ") out of range for byte");
}
return (byte)(1 << bit);
}
public static boolean isBitSet(byte value, int bit) {
return (value & getBitMask(bit)) != 0;
}
public static byte reverseByte(byte value) {
short s = (short) (value & 0xff);
short y = 0;
for (int position = 8 - 1; position >= 0; position--) {
y += ((s & 1) << position);
s >>= 1;
}
return (byte) (y & 0xff);
}
public static short reverseShort(short value) {
int i = (short) (value & 0xffff);
int y = 0;
for (int position = 16 - 1; position >= 0; position--) {
y += ((i & 1) << position);
i >>= 1;
}
return (short) (y & 0xffff);
}
}