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## About =========================== .NetFramework4.5 and .NetCore3.0 c#(CSharp) library for Cyclic Redundancy Check(CRC), contains almost all CRC-8, CRC-16 and CRC-32. OR define a algorithm yourself. ## How to =========================== ### 1. Define a new crc algorithm --------------------------- ```cs CrcAlgorithm algorithm; // used the standard model algorithm = CrcAlgorithm.Standard.Crc16X25; // OR define it yourself algorithm = new CrcAlgorithm( "CRC-16/X-25", // [Name]: what you call this algorithm 16, // [Width]: of polynomial(Poly) 0x1021, // [Poly]: (CRC-16/X-25)X^16+X^12+X^5+X^0 -> (poly is simplified and not include first bit) | (1 << 12) | (1 << 5) | (1 << 0) = 0X1021 0xFFFF, // [Init]: Initial value for the register true, // [IsRefInp]: Whether the bits of each byte are REFLECTED(*) before being processed true, // [IsRefOut]: Whether the algorithm feeds input bytes through the register or xors them with a byte from one end and then straight into the table. 0xFFFF, // [XorOut]: Value to XOR with the final register value. 0x906E); // [Check]: The checksum obtained when the ASCII string "123456789"(Standard.Validate) is fed. // REFLECTED(*): // 1100-1110-1010 -> 0101-0111-0011 ``` ### 2. Validate your algorithm --------------------------- ```cs bool isChecked = false; isChecked = algorithm.IsChecked; // algorithm.Check == algorithm.ComputeCrc(Standard.Validate, Standard.Validate.Length); Assert.IsTrue(isChecked); ``` ### 3. Define a data to validate --------------------------- ```cs byte[] data = Encoding.ASCII.GetBytes("123456789"); // string to calcualte -> byte[9] byte[] checksum = BitConverter.GetBytes((UInt16)algorithm.Check); // checksum 0x906E -> byte[2] byte[] buff = data.Concat(checksum).ToArray(); // buff = {data} + {checksum} ``` ### 4. Validate from buff or data and checksum --------------------------- ```cs bool validated = false; // calcualte from buff validated = algorithm.Validated(buff, length: buff.Length - 2, offset: 0); // [length]: length of data; [offset]: start index of data Assert.IsTrue(validated == true); // OR calcualte from data and checksum validated = algorithm.Validated(data, checksum); Assert.IsTrue(validated == true); ``` ### 5. If you want to know the expected checksum from data --------------------------- ```cs UInt64 expectedChecksum = algorithm.ComputeCrc(data, data.Length, offset: 0); Assert.AreEqual(expectedChecksum, checksum.ToUInt64()); ```
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