private void TestCalculate(CRCModel model, bool mapping, string str, uint expected)
{
var crc = CRC.Create(model, mapping);
var data = Encoding.ASCII.GetBytes(str);
var actual = crc.Calculate(data);
Assert.AreEqual(expected, actual);
}
private void TestVerify(CRCModel model, bool mapping, string str, uint crc, bool expected)
{
var data = Encoding.ASCII.GetBytes(str);
var obj = CRC.Create(model, mapping);
var actual = obj.Verify(data, crc);
Assert.AreEqual(expected, actual);
}
private void UpdateCRC()
{
var value = Models[Key];
if (value == mValue)
{
return;
}
CRC = CRC.Create(value);
mValue = value;
}
/// <summary>
/// 创建指定校验模式的 CRC 实例
/// </summary>
/// <param name="model">校验模式</param>
/// <param name="mapping">是否查表</param>
/// <returns>指定校验模式的 CRC 实例</returns>
public static CRC Create(CRCModel model, bool mapping = true)
{
switch (model)
{
case CRCModel.CRC_4_ITU:
return(Create("CRC-4/ITU", 4, 0x03, 0x00, true, true, 0x00, mapping));
case CRCModel.CRC_5_EPC:
return(Create("CRC-5/EPC", 5, 0x09, 0x09, false, false, 0x00, mapping));
case CRCModel.CRC_5_ITU:
return(Create("CRC-5/ITU", 5, 0x15, 0x00, true, true, 0x00, mapping));
case CRCModel.CRC_5_USB:
return(Create("CRC-5/USB", 5, 0x05, 0x1F, true, true, 0x1F, mapping));
case CRCModel.CRC_6_ITU:
return(Create("CRC-6/ITU", 6, 0x03, 0x00, true, true, 0x00, mapping));
case CRCModel.CRC_7_MMC:
return(Create("CRC-7/MMC", 7, 0x09, 0x00, false, false, 0x00, mapping));
case CRCModel.CRC_8:
return(Create("CRC-8", 8, 0x07, 0x00, false, false, 0x00, mapping));
case CRCModel.CRC_8_ITU:
return(Create("CRC-8/ITU", 8, 0x07, 0x00, false, false, 0x55, mapping));
case CRCModel.CRC_8_MAXIM:
return(Create("CRC-8/MAXIM", 8, 0x31, 0x00, true, true, 0x00, mapping));
case CRCModel.CRC_8_ROHC:
return(Create("CRC-8/ROHC", 8, 0x07, 0xFF, true, true, 0x00, mapping));
case CRCModel.CRC_16:
return(Create("CRC-16", 16, 0x8005, 0x0000, true, true, 0x0000, mapping));
case CRCModel.CRC_16_CCITT:
return(Create("CRC-16/CCITT", 16, 0x1021, 0x0000, true, true, 0x0000, mapping));
case CRCModel.CRC_16_CCITT_FALSE:
return(Create("CRC-16/CCITT-FALSE", 16, 0x1021, 0xFFFF, false, false, 0x0000, mapping));
case CRCModel.CRC_16_DNP:
return(Create("CRC-16/DNP", 16, 0x3D65, 0x0000, true, true, 0xFFFF, mapping));
case CRCModel.CRC_16_MAXIM:
return(Create("CRC-16/MAXIM", 16, 0x8005, 0x0000, true, true, 0xFFFF, mapping));
case CRCModel.CRC_16_MODBUS:
return(Create("CRC-16/MODBUS", 16, 0x8005, 0xFFFF, true, true, 0x0000, mapping));
case CRCModel.CRC_16_USB:
return(Create("CRC-16/USB", 16, 0x8005, 0xFFFF, true, true, 0xFFFF, mapping));
case CRCModel.CRC_16_X25:
return(Create("CRC-16/X25", 16, 0x1021, 0xFFFF, true, true, 0xFFFF, mapping));
case CRCModel.CRC_16_XMODEM:
return(Create("CRC-16/XMODEM", 16, 0x1021, 0x0000, false, false, 0x0000, mapping));
case CRCModel.CRC_32:
return(Create("CRC-32", 32, 0x04C11DB7, 0xFFFFFFFF, true, true, 0xFFFFFFFF, mapping));
case CRCModel.CRC_32_MPEG_2:
return(Create("CRC-32/MPEG-2", 32, 0x04C11DB7, 0xFFFFFFFF, false, false, 0x00000000, mapping));
default:
throw new ArgumentException("未定义的校验模型", nameof(model));
}
}
