package com.sandu.ximon.admin.manager.iot.rrpc.util; /** * Created by 11833 on 2018/1/5. */ public class CRCValidate { private static final String TAG="CRCValidate"; /** * 计算CRC * */ public static final int[] calculateCRC(byte[] data, int offset, int len) { int[] crc = { 0xFF, 0xFF }; int nextByte = 0; int uIndex; for (int i = offset; i < len && i < data.length; i++) { nextByte = 0xFF & ((int) data[i]); uIndex = crc[0] ^ nextByte; crc[0] = crc[1] ^ auchCRCHi[uIndex]; crc[1] = auchCRCLo[uIndex]; } return crc; }// calculateCRC /** * 锟斤拷锟斤拷一位CRC??锟斤拷锟斤拷位锟斤拷锟? * 锟斤拷一锟斤拷锟斤拷锟斤拷锟斤拷要锟斤拷锟斤拷锟絙uff * 锟斤拷一锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷始位锟斤拷 * 锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟姐长锟斤拷 * * */ public static final int calculateSingleCRC(byte[] data, int offset, int len) { int crc = data[offset]; /* pass through message buffer */ for (int i = offset+1; i < (offset+len) && i < data.length; i++) { crc = crc ^ ((int) data[i]); // *puchMsg++; /* calculate the CRC */ } return crc; } /** * /锟斤拷锟斤拷CRC?? 锟斤拷一锟斤拷锟斤拷锟斤拷锟斤拷要锟斤拷锟斤拷锟絚alcStr * // "01 10 00 5e 00 02 04 11 12 13 14"锟矫碉拷crc="df 19" */ public static final String calculateStringCRC(String calcStr) { String crcStr = null; if (SupplementUtils.isHex(calcStr)) { byte[] data = SupplementUtils.hexStringToBytes(calcStr); int[] crcIntArr = CRCValidate.calculateCRC(data, 0, data.length); byte[] crcByteArr1 = { 0, (byte) crcIntArr[0] }; byte[] crcByteArr2 = { 0, (byte) crcIntArr[1] }; // String crcStr1 = HexStrConvertUtil.bytesToHexString(crcByteArr1).substring(2); // String crcStr2 = HexStrConvertUtil.bytesToHexString(crcByteArr2).substring(2); // crcStr = crcStr1 + " " + crcStr2; } return crcStr.toLowerCase(); } /* Table of CRC values for high-order byte */ private final static short[] auchCRCHi = { 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40 }; /* Table of CRC values for low-order byte */ private final static short[] auchCRCLo = { 0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC2, 0xC6, 0x06, 0x07, 0xC7, 0x05, 0xC5, 0xC4, 0x04, 0xCC, 0x0C, 0x0D, 0xCD, 0x0F, 0xCF, 0xCE, 0x0E, 0x0A, 0xCA, 0xCB, 0x0B, 0xC9, 0x09, 0x08, 0xC8, 0xD8, 0x18, 0x19, 0xD9, 0x1B, 0xDB, 0xDA, 0x1A, 0x1E, 0xDE, 0xDF, 0x1F, 0xDD, 0x1D, 0x1C, 0xDC, 0x14, 0xD4, 0xD5, 0x15, 0xD7, 0x17, 0x16, 0xD6, 0xD2, 0x12, 0x13, 0xD3, 0x11, 0xD1, 0xD0, 0x10, 0xF0, 0x30, 0x31, 0xF1, 0x33, 0xF3, 0xF2, 0x32, 0x36, 0xF6, 0xF7, 0x37, 0xF5, 0x35, 0x34, 0xF4, 0x3C, 0xFC, 0xFD, 0x3D, 0xFF, 0x3F, 0x3E, 0xFE, 0xFA, 0x3A, 0x3B, 0xFB, 0x39, 0xF9, 0xF8, 0x38, 0x28, 0xE8, 0xE9, 0x29, 0xEB, 0x2B, 0x2A, 0xEA, 0xEE, 0x2E, 0x2F, 0xEF, 0x2D, 0xED, 0xEC, 0x2C, 0xE4, 0x24, 0x25, 0xE5, 0x27, 0xE7, 0xE6, 0x26, 0x22, 0xE2, 0xE3, 0x23, 0xE1, 0x21, 0x20, 0xE0, 0xA0, 0x60, 0x61, 0xA1, 0x63, 0xA3, 0xA2, 0x62, 0x66, 0xA6, 0xA7, 0x67, 0xA5, 0x65, 0x64, 0xA4, 0x6C, 0xAC, 0xAD, 0x6D, 0xAF, 0x6F, 0x6E, 0xAE, 0xAA, 0x6A, 0x6B, 0xAB, 0x69, 0xA9, 0xA8, 0x68, 0x78, 0xB8, 0xB9, 0x79, 0xBB, 0x7B, 0x7A, 0xBA, 0xBE, 0x7E, 0x7F, 0xBF, 0x7D, 0xBD, 0xBC, 0x7C, 0xB4, 0x74, 0x75, 0xB5, 0x77, 0xB7, 0xB6, 0x76, 0x72, 0xB2, 0xB3, 0x73, 0xB1, 0x71, 0x70, 0xB0, 0x50, 0x90, 0x91, 0x51, 0x93, 0x53, 0x52, 0x92, 0x96, 0x56, 0x57, 0x97, 0x55, 0x95, 0x94, 0x54, 0x9C, 0x5C, 0x5D, 0x9D, 0x5F, 0x9F, 0x9E, 0x5E, 0x5A, 0x9A, 0x9B, 0x5B, 0x99, 0x59, 0x58, 0x98, 0x88, 0x48, 0x49, 0x89, 0x4B, 0x8B, 0x8A, 0x4A, 0x4E, 0x8E, 0x8F, 0x4F, 0x8D, 0x4D, 0x4C, 0x8C, 0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86, 0x82, 0x42, 0x43, 0x83, 0x41, 0x81, 0x80, 0x40 }; /* * 锟叫讹拷CRC值锟角凤拷锟斤拷确--CRC校锟斤拷 */ public static Boolean isCRCConfig(byte[] buff) { int offset = 0; int len = buff.length - 2; // 锟斤拷锟斤拷前锟斤拷模锟斤拷锟街凤拷锟街革拷睢拷锟斤拷荩锟斤拷锟斤拷锟叫ｏ拷锟斤拷耄╋拷锟? // 锟斤拷锟斤拷CRC值,(锟斤拷一锟斤拷锟斤拷锟斤拷锟斤拷要锟斤拷锟斤拷锟絙uff 锟斤拷一锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷始位 锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟姐长锟斤拷) int[] crc = CRCValidate.calculateCRC(buff, offset, len); // 锟饺斤拷buff锟斤拷锟斤拷锟斤拷锟轿籆RC锟斤拷锟角凤拷锟斤拷诩锟斤拷锟斤拷锟斤拷锟斤拷CRC锟斤拷 return (byte) crc[0] == buff[buff.length - 2] & (byte) crc[1] == buff[buff.length - 1]; } }