android-uniapp/utils/common/wrs-CRCUtils.js

import * as IntUtils from './wrs-IntUtils.js';

/* 
 *  http://www.metools.info/code/c15.html
 *  采用的是CRC-16/MODBUS
 *  ios swift: https://github.com/ivanesik/CrcSwift
 */
export function getCRC16_MODBUS(bytes) {
	var CRC = 0x0000ffff;
	var POLYNOMIAL = 0x0000a001;
	var i;
	var j;
	for (i = 0; i < bytes.length; i++) {
		CRC ^= (bytes[i] & 0x000000ff);
		for (j = 0; j < 8; j++) {
			if ((CRC & 0x00000001) != 0) {
				CRC >>= 1;
				CRC ^= POLYNOMIAL;
			} else {
				CRC >>= 1;
			}
		}
	}
	return CRC;
}

export function getCRC16_CCITT_FALSE(bytes) {
	var crc = 0xffff; // initial value
	var polynomial = 0x1021; // poly value
	for (var index = 0; index < bytes.length; index++) {
		var b = bytes[index];
		for (var i = 0; i < 8; i++) {
			var bit = ((b >> (7 - i) & 1) == 1);
			var c15 = ((crc >> 15 & 1) == 1);
			crc <<= 1;
			if (c15 ^ bit) {
				crc ^= polynomial;
			}
		}
	}
	crc &= 0xffff;
	return crc;
}

export function getCRC32(data) {
	var table = [
		0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
		0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
		0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
		0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
		0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
		0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
		0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
		0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
		0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
		0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
		0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
		0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
		0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
		0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
		0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
		0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
		0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
		0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
		0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
		0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
		0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
		0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
		0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
		0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
		0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
		0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
		0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
		0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
		0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
		0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
		0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
		0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d,
	];
	var crc = 0xffffffff;
	var length = data.length;
	for (var i = 0; i < length; i++) {
        var b = data[i];
		crc = (crc >>> 8 ^ table[(crc ^ b) & 0xff]);
	}
	crc = crc ^ 0xffffffff;
	return crc;
}


export function getCRC3200(data, initialCrc, polynom, xor, refIn, refOut) {
	var crcArray = Uint32Array.from([initialCrc]);
	var length = data.length;
	for (var i = 0; i < length; i++) {
		var byte = data[i];
		if (refIn) {
			var reverBit = reverseBits(byte)
			var reverBitArray = Uint32Array.from([reverBit])
			crcArray[0] = (reverBitArray[0] << 24) ^ crcArray[0]
		} else {
			crcArray[0] = (byte << 24) ^ crcArray[0]
		}
		for (var j = 0; j < 8; j++) {
			let check = crcArray[0] & 0x80000000
			crcArray[0] = crcArray[0] << 1

			if (check != 0) {
				crcArray[0] = crcArray[0] ^ polynom
			}
		}
	}

	if (refOut) {
		reverseBits(crcArray[0])
	}
	return (crcArray[0] ^ xor)
}

function reverseBits(value) {
	var bitStr = IntUtils.intToBit(value);
	if (bitStr.length < 8) {
		let count = 8 - bitStr.length
		for (var i = 0; i < count; i++) {
			bitStr = "0" + bitStr;
		}
	}
	var reverBitStr = reverseString(bitStr);
	var intValue = IntUtils.bitToInt(reverBitStr);
	return intValue
}

function reverseString(str) {
	let reversedStr = '';
	for (let i = str.length - 1; i >= 0; i--) {
		reversedStr += str[i];
	}
	return reversedStr;
}


// 	if refOut {
// 		crc = DataHelper.reverseBits(crc)
// 	}

// 	return crc ^ xor
// }


// module.exports = {
// 	getCRC16_MODBUS: getCRC16_MODBUS,
// 	getCRC16_CCITT_FALSE: getCRC16_CCITT_FALSE,
// 	highLowToInt: highLowToInt,
// 	intToHighLow: intToHighLow
// }