crc16

import React, { Component } from 'react';
import { Buffer } from 'buffer'

var crc_table = [
    0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5,
    0x60c6, 0x70e7, 0x8108, 0x9129, 0xa14a, 0xb16b,
    0xc18c, 0xd1ad, 0xe1ce, 0xf1ef, 0x1231, 0x0210,
    0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
    0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c,
    0xf3ff, 0xe3de, 0x2462, 0x3443, 0x0420, 0x1401,
    0x64e6, 0x74c7, 0x44a4, 0x5485, 0xa56a, 0xb54b,
    0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
    0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6,
    0x5695, 0x46b4, 0xb75b, 0xa77a, 0x9719, 0x8738,
    0xf7df, 0xe7fe, 0xd79d, 0xc7bc, 0x48c4, 0x58e5,
    0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
    0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969,
    0xa90a, 0xb92b, 0x5af5, 0x4ad4, 0x7ab7, 0x6a96,
    0x1a71, 0x0a50, 0x3a33, 0x2a12, 0xdbfd, 0xcbdc,
    0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
    0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03,
    0x0c60, 0x1c41, 0xedae, 0xfd8f, 0xcdec, 0xddcd,
    0xad2a, 0xbd0b, 0x8d68, 0x9d49, 0x7e97, 0x6eb6,
    0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
    0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a,
    0x9f59, 0x8f78, 0x9188, 0x81a9, 0xb1ca, 0xa1eb,
    0xd10c, 0xc12d, 0xf14e, 0xe16f, 0x1080, 0x00a1,
    0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
    0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c,
    0xe37f, 0xf35e, 0x02b1, 0x1290, 0x22f3, 0x32d2,
    0x4235, 0x5214, 0x6277, 0x7256, 0xb5ea, 0xa5cb,
    0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
    0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447,
    0x5424, 0x4405, 0xa7db, 0xb7fa, 0x8799, 0x97b8,
    0xe75f, 0xf77e, 0xc71d, 0xd73c, 0x26d3, 0x36f2,
    0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
    0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9,
    0xb98a, 0xa9ab, 0x5844, 0x4865, 0x7806, 0x6827,
    0x18c0, 0x08e1, 0x3882, 0x28a3, 0xcb7d, 0xdb5c,
    0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
    0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0,
    0x2ab3, 0x3a92, 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d,
    0xbdaa, 0xad8b, 0x9de8, 0x8dc9, 0x7c26, 0x6c07,
    0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
    0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba,
    0x8fd9, 0x9ff8, 0x6e17, 0x7e36, 0x4e55, 0x5e74,
    0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
];
export default class crcLib extends React.Component {

  static calc(originString = '') {
    var CRC = {};
    CRC.CRC16 = function (data) {
        var len = data.length;
        if (len > 0) {
            var crc = 0xFFFF;
            for (var i = 0; i < len; i++) {
                crc = (crc ^ (data[i]));
                for (var j = 0; j < 8; j++) {
                    crc = (crc & 1) != 0 ? ((crc >> 1) ^ 0xA001) : (crc >> 1);
                }
            }
            var hi = ((crc & 0xFF00) >> 8);  //高位置
            var lo = (crc & 0x00FF);         //低位置
            return [hi, lo];
        }
        return [0, 0];
    };
    CRC.crcCCITT = function (input, seed) {
        var result = seed;
        var temp;
        for (var i = 0, len = input.length; i < len; ++i) {
            temp = (input[i] ^ (result >> 8)) & 0xFF;
            result = crc_table[temp] ^  (result << 8);
        }
        return result;
    };

    CRC.isArray = function (arr) {
      return Object.prototype.toString.call(arr) === '[object Array]';
    };

    CRC.ToCRC16 = function (str, isReverse) {
      return CRC.toString(CRC.CRC16(CRC.isArray(str) ? str : CRC.strToByte(str)), isReverse);
    };
    CRC.ToModbusCRC16 = function (str, isReverse) {
        return CRC.toString(CRC.CRC16(CRC.isArray(str) ? str : CRC.strToHex(str)), isReverse);
    };
    CRC.ToCCITTCRC16 = function (str) {
        let newString = CRC.isArray(str) ? str : CRC.strToHex(str);
        let result = CRC.crcCCITT(newString, 0xFFFF);
        let bf = new Buffer([result >> 8, result & 0xFF]);
        let bfString = bf.toString('hex').toUpperCase();
        return bfString;
    };
    CRC.ToXMODEM = function (str) {
        let newString = CRC.isArray(str) ? str : CRC.strToHex(str);
        let result = CRC.crcCCITT(newString, 0x0000);
        let bf = new Buffer([result >> 8, result & 0xFF]);
        let bfString = bf.toString('hex').toUpperCase();
        // return CRC.toString(CRC.CRC16(CRC.isArray(str) ? str : CRC.strToHex(str)), isReverse);
        return bfString;
    };
    CRC.To1D0F = function (str) {
        let newString = CRC.isArray(str) ? str : CRC.strToHex(str);
        let result = CRC.crcCCITT(newString, 0x0000);
        let bf = new Buffer([result >> 8, result & 0xFF]);
        let bfString = bf.toString('hex').toUpperCase();
        return bfString;
    };
    CRC.ToKermit = function (str) {
        let newString = CRC.isArray(str) ? str : CRC.strToHex(str);
        let result = CRC.crcCCITT(newString, 0x0000);
        let bf = new Buffer([result >> 8, result & 0xFF]);
        let bfString = bf.toString('hex').toUpperCase();
        return bfString;
    };
    CRC.strToByte = function (str) {
        var tmp = str.split(''), arr = [];
        for (var i = 0, c = tmp.length; i < c; i++) {
            var j = encodeURI(tmp[i]);
            if (j.length == 1) {
                arr.push(j.charCodeAt());
            } else {
                var b = j.split('%');
                for (var m = 1; m < b.length; m++) {
                    arr.push(parseInt('0x' + b[m]));
                }
            }
        }
        return arr;
    };
    CRC.convertChinese = function (str) {
        var tmp = str.split(''), arr = [];
        for (var i = 0, c = tmp.length; i < c; i++) {
            var s = tmp[i].charCodeAt();
            if (s <= 0 || s >= 127) {
                arr.push(s.toString(16));
            }
            else {
                arr.push(tmp[i]);
            }
        }
        return arr;
    };
    CRC.filterChinese = function (str) {
        var tmp = str.split(''), arr = [];
        for (var i = 0, c = tmp.length; i < c; i++) {
            var s = tmp[i].charCodeAt();
            if (s > 0 && s < 127) {
                arr.push(tmp[i]);
            }
        }
        return arr;
    };
    CRC.strToHex = function (hex, isFilterChinese) {
        hex = isFilterChinese ? CRC.filterChinese(hex).join('') : CRC.convertChinese(hex).join('');
        //清除所有空格
        hex = hex.replace(/\s/g, "");
        //若字符个数为奇数，补一个0
        hex += hex.length % 2 != 0 ? "0" : "";

        var c = hex.length / 2, arr = [];
        for (var i = 0; i < c; i++) {
            arr.push(parseInt(hex.substr(i * 2, 2), 16));
        }
        return arr;
    };
    CRC.padLeft = function (s, w, pc) {
        if (pc == undefined) {
            pc = '0';
        }
        for (var i = 0, c = w - s.length; i < c; i++) {
            s = pc + s;
        }
        return s;
    };
    CRC.toString = function (arr, isReverse) {
        if (typeof isReverse == 'undefined') {
            isReverse = true;
        }
        var hi = arr[0], lo = arr[1];
        return CRC.padLeft((isReverse ? hi + lo * 0x100 : hi * 0x100 + lo).toString(16).toUpperCase(), 4, '0');
    };
    console.log("origin =>", originString);
    console.log("XMODEM =>", CRC.ToXMODEM(originString));
    console.log("CCITTCRC =>", CRC.ToCCITTCRC16(originString));
    console.log("Kermit =>", CRC.ToKermit(originString));
  }
}