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package com.diozero.util;
/*-
* #%L
* Organisation: diozero
* Project: Device I/O Zero - Core
* Filename: Crc.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%
*/
/**
* CRC-8 and CRC-16 calculator.
*
* See:
*
*/
public class Crc {
public static class Params {
private short polynomial;
private short init;
private boolean reverseIn;
private boolean reverseOut;
private short xorOut;
private int[] data;
public Params(int polynomial, int init, boolean reverseIn, boolean reverseOut, int xorOut) {
this.polynomial = (short) polynomial;
this.init = (short) init;
this.reverseIn = reverseIn;
this.reverseOut = reverseOut;
this.xorOut = (short) xorOut;
}
public short getPolynomial() {
return polynomial;
}
public short getInit() {
return init;
}
public boolean isReverseIn() {
return reverseIn;
}
public boolean isReverseOut() {
return reverseOut;
}
public short getXorOut() {
return xorOut;
}
private void makeTable() {
data = new int[256];
int crc;
for (int n = 0; n < 256; n++) {
crc = n << 8;
for (int i = 0; i < 8; i++) {
boolean bit = (crc & 0x8000) != 0;
crc <<= 1;
if (bit) {
crc ^= polynomial;
}
}
data[n] = crc & 0xffff;
}
}
public int[] getData() {
if (data == null) {
makeTable();
}
return data;
}
}
public static final Params CRC8 = new Params(0x07, 0x00, false, false, 0x00);
public static final Params CRC8_CDMA2000 = new Params(0x9b, 0xff, false, false, 0x00);
public static final Params CRC8_DARC = new Params(0x39, 0x00, true, true, 0x00);
public static final Params CRC8_DVBS2 = new Params(0xd5, 0x00, false, false, 0x00);
public static final Params CRC8_EBU = new Params(0x1d, 0xff, true, true, 0x00);
public static final Params CRC8_ICODE = new Params(0x1d, 0xfd, false, false, 0x00);
public static final Params CRC8_ITU = new Params(0x07, 0x00, false, false, 0x55);
public static final Params CRC8_MAXIM = new Params(0x31, 0x00, true, true, 0x00);
public static final Params CRC8_ROHC = new Params(0x07, 0xff, true, true, 0x00);
public static final Params CRC8_WCDMA = new Params(0x9b, 0x00, true, true, 0x00);
/**
* Calculate CRC-8 checksum using the default {@link Crc#CRC8 CRC8} parameters
*
* @param data data to checksum (big endian)
* @return CRC-8 checksum
*/
public static int crc8(short data) {
// Assumes Big Endian
return crc8(CRC8, (byte) (data >> 8), (byte) (data & 0xff));
}
/**
* Calculate CRC-8 checksum using the specified {@link Params parameters}
*
* @param params CRC {@link Params parameters}
* @param data data to checksum (big endian)
* @return CRC-8 checksum
*/
public static int crc8(Params params, short data) {
// Assumes Big Endian
return crc8(params, (byte) (data >> 8), (byte) (data & 0xff));
}
/**
* Calculate CRC-8 checksum using the default {@link Crc#CRC8 CRC8} parameters
*
* @param data data to checksum
* @return CRC-8 checksum
*/
public static int crc8(byte... data) {
return crc8(CRC8, data);
}
/**
* Calculate CRC-8 checksum using the specified {@link Params parameters}
*
* @param params CRC {@link Params parameters}
* @param data data to checksum
* @return CRC-8 checksum
*/
public static int crc8(Params params, byte... data) {
byte crc = (byte) params.getInit();
// Calculate the 8-Bit checksum for the given polynomial
for (byte b : data) {
if (params.isReverseIn()) {
b = BitManipulation.reverseByte(b);
}
crc ^= (b & 0xff);
for (int crc_bit = 8; crc_bit > 0; --crc_bit) {
boolean bit = (crc & 0x80) != 0;
crc <<= 1;
if (bit) {
crc = (byte) (crc ^ params.getPolynomial());
}
}
}
if (params.isReverseOut()) {
crc = BitManipulation.reverseByte(crc);
}
return (crc ^ params.getXorOut()) & 0xff;
}
public static final Params CRC16_CCITT_FALSE = new Params(0x1021, 0xFFFF, false, false, 0x0000);
public static final Params CRC16_ARC = new Params(0x8005, 0x0000, true, true, 0x0000);
public static final Params CRC16_AUG_CCITT = new Params(0x1021, 0x1D0F, false, false, 0x0000);
public static final Params CRC16_BUYPASS = new Params(0x8005, 0x0000, false, false, 0x0000);
public static final Params CRC16_CDMA2000 = new Params(0xC867, 0xFFFF, false, false, 0x0000);
public static final Params CRC16_DDS_110 = new Params(0x8005, 0x800D, false, false, 0x0000);
public static final Params CRC16_DECT_R = new Params(0x0589, 0x0000, false, false, 0x0001);
public static final Params CRC16_DECT_X = new Params(0x0589, 0x0000, false, false, 0x0000);
public static final Params CRC16_DNP = new Params(0x3D65, 0x0000, true, true, 0xFFFF);
public static final Params CRC16_EN_13757 = new Params(0x3D65, 0x0000, false, false, 0xFFFF);
public static final Params CRC16_GENIBUS = new Params(0x1021, 0xFFFF, false, false, 0xFFFF);
public static final Params CRC16_MAXIM = new Params(0x8005, 0x0000, true, true, 0xFFFF);
public static final Params CRC16_MCRF4XX = new Params(0x1021, 0xFFFF, true, true, 0x0000);
public static final Params CRC16_RIELLO = new Params(0x1021, 0xB2AA, true, true, 0x0000);
public static final Params CRC16_T10_DIF = new Params(0x8BB7, 0x0000, false, false, 0x0000);
public static final Params CRC16_TELEDISK = new Params(0xA097, 0x0000, false, false, 0x0000);
public static final Params CRC16_TMS37157 = new Params(0x1021, 0x89EC, true, true, 0x0000);
public static final Params CRC16_USB = new Params(0x8005, 0xFFFF, true, true, 0xFFFF);
public static final Params CRC16_A = new Params(0x1021, 0xC6C6, true, true, 0x0000);
public static final Params CRC16_KERMIT = new Params(0x1021, 0x0000, true, true, 0x0000);
public static final Params CRC16_MODBUS = new Params(0x8005, 0xFFFF, true, true, 0x0000);
public static final Params CRC16_X25 = new Params(0x1021, 0xFFFF, true, true, 0xFFFF);
public static final Params CRC16_XMODEM = new Params(0x1021, 0x0000, false, false, 0x0000);
/**
* Calculate CRC-16 using the specified {@link Params parameters}
*
* @param params CRC {@link Params parameters}
* @param data The data to generate the CRC for (big endian)
* @return the calculated CRC-16 value
*/
public static int crc16Short(Params params, short data) {
return crc16(params, (byte) (data >> 8), (byte) data);
}
public static int crc16(Params params, byte... data) {
int[] table = params.getData();
int crc = params.getInit();
for (byte b : data) {
if (params.isReverseIn()) {
b = BitManipulation.reverseByte(b);
}
crc = (crc << 8) ^ table[(crc >> 8 ^ b) & 0xff];
}
if (params.isReverseOut()) {
crc = BitManipulation.reverseShort((short) crc);
}
return (crc ^ params.getXorOut()) & 0xffff;
}
}
