Qt通用方法及类库8

函数名

    //异或加密算法
    static QString getXorEncryptDecrypt(const QString &str, char key);
    //异或校验
    static uchar getOrCode(const QByteArray &data);
    //计算校验码
    static uchar getCheckCode(const QByteArray &data);

    //CRC校验
    static quint16 getRevCrc_16(quint8 *data, int len, quint16 init, const quint16 *table);
    static quint16 getCrc_16(quint8 *data, int len, quint16 init, const quint16 *table);
    static quint16 getModbus16(quint8 *data, int len);
    static QByteArray getCRCCode(const QByteArray &data);

函数体

QString QUIHelper::getXorEncryptDecrypt(const QString &str, char key)
{
    QByteArray data = str.toLatin1();
    int size = data.size();
    for (int i = 0; i < size; i++) {
        data[i] = data[i] ^ key;
    }

    return QLatin1String(data);
}

uchar QUIHelper::getOrCode(const QByteArray &data)
{
    int len = data.length();
    uchar result = 0;

    for (int i = 0; i < len; i++) {
        result ^= data.at(i);
    }

    return result;
}

uchar QUIHelper::getCheckCode(const QByteArray &data)
{
    int len = data.length();
    uchar temp = 0;

    for (uchar i = 0; i < len; i++) {
        temp += data.at(i);
    }

    return temp % 256;
}

//函数功能：计算CRC16
//参数1：*data 16位CRC校验数据，
//参数2：len   数据流长度
//参数3：init  初始化值
//参数4：table 16位CRC查找表

//逆序CRC计算
quint16 QUIHelper::getRevCrc_16(quint8 *data, int len, quint16 init, const quint16 *table)
{
    quint16 cRc_16 = init;
    quint8 temp;

    while (len-- > 0) {
        temp = cRc_16 >> 8;
        cRc_16 = (cRc_16 << 8) ^ table[(temp ^ *data++) & 0xff];
    }

    return cRc_16;
}

//正序CRC计算
quint16 QUIHelper::getCrc_16(quint8 *data, int len, quint16 init, const quint16 *table)
{
    quint16 cRc_16 = init;
    quint8 temp;

    while (len-- > 0) {
        temp = cRc_16 & 0xff;
        cRc_16 = (cRc_16 >> 8) ^ table[(temp ^ *data++) & 0xff];
    }

    return cRc_16;
}

//Modbus CRC16校验
quint16 QUIHelper::getModbus16(quint8 *data, int len)
{
    //MODBUS CRC-16表 8005 逆序
    const quint16 table_16[256] = {
        0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241,
        0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440,
        0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40,
        0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841,
        0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40,
        0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41,
        0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641,
        0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040,
        0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240,
        0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441,
        0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41,
        0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840,
        0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41,
        0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40,
        0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640,
        0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041,
        0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240,
        0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441,
        0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41,
        0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840,
        0x7800, 0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41,
        0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40,
        0xB401, 0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640,
        0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041,
        0x5000, 0x90C1, 0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241,
        0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440,
        0x9C01, 0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81, 0x5E40,
        0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841,
        0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81, 0x4A40,
        0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 0x8C41,
        0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641,
        0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040
    };

    return getCrc_16(data, len, 0xFFFF, table_16);
}

//CRC16校验
QByteArray QUIHelper::getCRCCode(const QByteArray &data)
{
    quint16 result = getModbus16((quint8 *)data.data(), data.length());
    return QUIHelper::ushortToByteRec(result);
}