CRC即循环冗余校验码（Cyclic Redundancy Check）：是数据通信领域中最常用的一种查错校验码，其特征是信息字段和校验字段的长度可以任意选定。循环冗余检查（CRC）是一种数据传输检错功能，对数据进行多项式计算，并将得到的结果附在帧的后面，接收设备也执行类似的算法，以保证数据传输的正确性和完整性。
CRC算法参数模型解释：
- NAME：参数模型名称。
- WIDTH：宽度，即CRC比特数。
- POLY：生成项的简写，以16进制表示。例如：CRC-32即是0x04C11DB7，忽略了最高位的"1"，即完整的生成项是0x104C11DB7。
- INIT：这是算法开始时寄存器（crc）的初始化预置值，十六进制表示。
- REFIN：待测数据的每个字节是否按位反转，True或False。
- REFOUT：在计算后之后，异或输出之前，整个数据是否按位反转，True或False。
- XOROUT：计算结果与此参数异或后得到最终的CRC值。
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/// ********************************************************************** /// Name: CRC-4/ITU x4+x+1 /// Poly: 0x03 /// Init: 0x00 /// Refin: true /// Refout: true /// Xorout: 0x00 ///************************************************************************* public static byte[] Crc1(byte[] buffer, int start = 0, int len = 0) { if (buffer == null || buffer.Length == 0) return null; if (start < 0) return null; if (len == 0) len = buffer.Length - start; int length = start + len; if (length > buffer.Length) return null; byte crc = 0;// Initial value for (int i = start; i < length; i++) { crc ^= buffer[i]; for (int j = 0; j < 8; j++) { if ((crc & 1) > 0) crc = (byte)((crc >> 1) ^ 0x0C);//0x0C = (reverse 0x03)>>(8-4) else crc = (byte)(crc >> 1); } } return new byte[] { crc }; } /// ********************************************************************** /// Name: CRC-5/EPC x5+x3+1 /// Poly: 0x09 /// Init: 0x09 /// Refin: false /// Refout: false /// Xorout: 0x00 ///************************************************************************* public static byte[] Crc2(byte[] buffer, int start = 0, int len = 0) { if (buffer == null || buffer.Length == 0) return null; if (start < 0) return null; if (len == 0) len = buffer.Length - start; int length = start + len; if (length > buffer.Length) return null; byte crc = 0x48;// Initial value: 0x48 = 0x09<<(8-5) for (int i = start; i < length; i++) { crc ^= buffer[i]; for (int j = 0; j < 8; j++) { if ((crc & 0x80) > 0) crc = (byte)((crc << 1) ^ 0x48);// 0x48 = 0x09<<(8-5) else crc = (byte)(crc << 1); } } return new byte[] { (byte)(crc >> 3) }; } /// ********************************************************************** /// Name: CRC-5/ITU x5+x4+x2+1 /// Poly: 0x15 /// Init: 0x00 /// Refin: true /// Refout: true /// Xorout: 0x00 ///************************************************************************* public static byte[] Crc3(byte[] buffer, int start = 0, int len = 0) { if (buffer == null || buffer.Length == 0) return null; if (start < 0) return null; if (len == 0) len = buffer.Length - start; int length = start + len; if (length > buffer.Length) return null; byte crc = 0;// Initial value for (int i = start; i < length; i++) { crc ^= buffer[i]; for (int j = 0; j < 8; j++) { if ((crc & 1) > 0) crc = (byte)((crc >> 1) ^ 0x15);// 0x15 = (reverse 0x15)>>(8-5) else crc = (byte)(crc >> 1); } } return new byte[] { crc }; } /// ********************************************************************** /// Name: CRC-5/USB x5+x2+1 /// Poly: 0x05 /// Init: 0x1F /// Refin: true /// Refout: true /// Xorout: 0x1F ///************************************************************************* public static byte[] Crc4(byte[] buffer, int start = 0, int len = 0) { if (buffer == null || buffer.Length == 0) return null; if (start < 0) return null; if (len == 0) len = buffer.Length - start; int length = start + len; if (length > buffer.Length) return null; byte crc = 0x1F;// Initial value for (int i = start; i < length; i++) { crc ^= buffer[i]; for (int j = 0; j < 8; j++) { if ((crc & 1) > 0) crc = (byte)((crc >> 1) ^ 0x14);// 0x14 = (reverse 0x05)>>(8-5) else crc = (byte)(crc >> 1); } } return new byte[] {(byte)( crc ^ 0x1F) }; } /// ********************************************************************** /// Name: CRC-6/ITU x6+x+1 /// Poly: 0x03 /// Init: 0x00 /// Refin: true /// Refout: true /// Xorout: 0x00 ///************************************************************************* public static byte[] Crc5(byte[] buffer, int start = 0, int len = 0) { if (buffer == null || buffer.Length == 0) return null; if (start < 0) return null; if (len == 0) len = buffer.Length - start; int length = start + len; if (length > buffer.Length) return null; byte crc = 0;// Initial value for (int i = start; i < length; i++) { crc ^= buffer[i]; for (int j = 0; j < 8; j++) { if ((crc & 1) > 0) crc = (byte)((crc >> 1) ^ 0x30);// 0x30 = (reverse 0x03)>>(8-6) else crc = (byte)(crc >> 1); } } return new byte[] { crc }; } /// ********************************************************************** /// Name: CRC-7/MMC x7+x3+1 /// Poly: 0x09 /// Init: 0x00 /// Refin: false /// Refout: false /// Xorout: 0x00 ///************************************************************************* public static byte[] Crc6(byte[] buffer, int start = 0, int len = 0) { if (buffer == null || buffer.Length == 0) return null; if (start < 0) return null; if (len == 0) len = buffer.Length - start; int length = start + len; if (length > buffer.Length) return null; byte crc = 0;// Initial value for (int i = start; i < length; i++) { crc ^= buffer[i]; for (int j = 0; j < 8; j++) { if ((crc & 0x80) > 0) crc = (byte)((crc << 1) ^ 0x12);// 0x12 = 0x09<<(8-7) else crc = (byte)(crc << 1); } } return new byte[] { (byte)(crc >> 1) }; } /// ********************************************************************** /// Name: CRC8 x8+x2+x+1 /// Poly: 0x07 /// Init: 0x00 /// Refin: false /// Refout: false /// Xorout: 0x00 ///************************************************************************* public static byte[] Crc7(byte[] buffer, int start = 0, int len = 0) { if (buffer == null || buffer.Length == 0) return null; if (start < 0) return null; if (len == 0) len = buffer.Length - start; int length = start + len; if (length > buffer.Length) return null; byte crc = 0;// Initial value for (int i = start; i < length; i++) { crc ^= buffer[i]; for (int j = 0; j < 8; j++) { if ((crc & 0x80) > 0) crc = (byte)((crc << 1) ^ 0x07); else crc = (byte)(crc << 1); } } return new byte[] { crc }; } /// ********************************************************************** /// Name: CRC-8/ITU x8+x2+x+1 /// Poly: 0x07 /// Init: 0x00 /// Refin: false /// Refout: false /// Xorout: 0x55 ///************************************************************************* public static byte[] Crc8(byte[] buffer, int start = 0, int len = 0) { if (buffer == null || buffer.Length == 0) return null; if (start < 0) return null; if (len == 0) len = buffer.Length - start; int length = start + len; if (length > buffer.Length) return null; byte crc = 0;// Initial value for (int i = start; i < length; i++) { crc ^= buffer[i]; for (int j = 0; j < 8; j++) { if ((crc & 0x80) > 0) crc = (byte)((crc << 1) ^ 0x07); else crc = (byte)(crc << 1); } } return new byte[] { (byte)(crc ^ 0x55) }; } /// ********************************************************************** /// Name: CRC-8/MAXIM x8+x5+x4+1 /// Poly: 0x31 /// Init: 0x00 /// Refin: true /// Refout: true /// Xorout: 0x00 ///************************************************************************* public static byte[] Crc9(byte[] buffer, int start = 0, int len = 0) { if (buffer == null || buffer.Length == 0) return null; if (start < 0) return null; if (len == 0) len = buffer.Length - start; int length = start + len; if (length > buffer.Length) return null; byte crc = 0;// Initial value for (int i = start; i < length; i++) { crc ^= buffer[i]; for (int j = 0; j < 8; j++) { if ((crc & 1) > 0) crc = (byte)((crc >> 1) ^ 0x8C);// 0x8C = reverse 0x31 else crc = (byte)(crc >> 1); } } return new byte[] { crc }; } /// ********************************************************************** /// Name: CRC-8/ROHC x8+x2+x+1 /// Poly: 0x07 /// Init: 0xFF /// Refin: true /// Refout: true /// Xorout: 0x00 ///************************************************************************* public static byte[] Crc10(byte[] buffer, int start = 0, int len = 0) { if (buffer == null || buffer.Length == 0) return null; if (start < 0) return null; if (len == 0) len = buffer.Length - start; int length = start + len; if (length > buffer.Length) return null; byte crc = 0xFF;// Initial value for (int i = start; i < length; i++) { crc ^= buffer[i]; for (int j = 0; j < 8; j++) { if ((crc & 1) > 0) crc = (byte)((crc >> 1) ^ 0xE0);// 0xE0 = reverse 0x07 else crc = (byte)(crc >> 1); } } return new byte[] { crc }; } /// Z1协议校验码计算 static byte[] table = { 0x00, 0x1C, 0x38, 0x24, 0x70, 0x6C, 0x48, 0x54, 0xE0, 0xFC, 0xD8, 0xC4, 0x90, 0x8C, 0xA8, 0xB4, 0xDC, 0xC0, 0xE4, 0xF8, 0xAC, 0xB0, 0x94, 0x88, 0x3C, 0x20, 0x04, 0x18, 0x4C, 0x50, 0x74, 0x68, 0xA4, 0xB8, 0x9C, 0x80, 0xD4, 0xC8, 0xEC, 0xF0, 0x44, 0x58, 0x7C, 0x60, 0x34, 0x28, 0x0C, 0x10, 0x78, 0x64, 0x40, 0x5C, 0x08, 0x14, 0x30, 0x2C, 0x98, 0x84, 0xA0, 0xBC, 0xE8, 0xF4, 0xD0, 0xCC, 0x54, 0x48, 0x6C, 0x70, 0x24, 0x38, 0x1C, 0x00, 0xB4, 0xA8, 0x8C, 0x90, 0xC4, 0xD8, 0xFC, 0xE0, 0x88, 0x94, 0xB0, 0xAC, 0xF8, 0xE4, 0xC0, 0xDC, 0x68, 0x74, 0x50, 0x4C, 0x18, 0x04, 0x20, 0x3C, 0xF0, 0xEC, 0xC8, 0xD4, 0x80, 0x9C, 0xB8, 0xA4, 0x10, 0x0C, 0x28, 0x34, 0x60, 0x7C, 0x58, 0x44, 0x2C, 0x30, 0x14, 0x08, 0x5C, 0x40, 0x64, 0x78, 0xCC, 0xD0, 0xF4, 0xE8, 0xBC, 0xA0, 0x84, 0x98, 0xA8, 0xB4, 0x90, 0x8C, 0xD8, 0xC4, 0xE0, 0xFC, 0x48, 0x54, 0x70, 0x6C, 0x38, 0x24, 0x00, 0x1C, 0x74, 0x68, 0x4C, 0x50, 0x04, 0x18, 0x3C, 0x20, 0x94, 0x88, 0xAC, 0xB0, 0xE4, 0xF8, 0xDC, 0xC0, 0x0C, 0x10, 0x34, 0x28, 0x7C, 0x60, 0x44, 0x58, 0xEC, 0xF0, 0xD4, 0xC8, 0x9C, 0x80, 0xA4, 0xB8, 0xD0, 0xCC, 0xE8, 0xF4, 0xA0, 0xBC, 0x98, 0x84, 0x30, 0x2C, 0x08, 0x14, 0x40, 0x5C, 0x78, 0x64, 0xFC, 0xE0, 0xC4, 0xD8, 0x8C, 0x90, 0xB4, 0xA8, 0x1C, 0x00, 0x24, 0x38, 0x6C, 0x70, 0x54, 0x48, 0x20, 0x3C, 0x18, 0x04, 0x50, 0x4C, 0x68, 0x74, 0xC0, 0xDC, 0xF8, 0xE4, 0xB0, 0xAC, 0x88, 0x94, 0x58, 0x44, 0x60, 0x7C, 0x28, 0x34, 0x10, 0x0C, 0xB8, 0xA4, 0x80, 0x9C, 0xC8, 0xD4, 0xF0, 0xEC, 0x84, 0x98, 0xBC, 0xA0, 0xF4, 0xE8, 0xCC, 0xD0, 0x64, 0x78, 0x5C, 0x40, 0x14, 0x08, 0x2C, 0x30 }; public static byte[] Crc11(byte[] buffer, int start = 0, int len = 0) { if (buffer == null || buffer.Length == 0) return null; if (start < 0) return null; if (len == 0) len = buffer.Length - start; int length = start + len; if (length > buffer.Length) return null; int i; byte crc = 0x00; int tableIndex; for (i = start; i < length; i++) { tableIndex = crc ^ (buffer[i] & 0xFF); crc = table[tableIndex]; } return new byte[] { crc }; } /// ********************************************************************** /// Name: CRC-12 x16+x12+x5+1 /// Poly: 0x80 /// Init: 0x0000 /// Refin: true /// Refout: true /// Xorout: 0x0000 ///************************************************************************* public static byte[] Crc12(byte[] buffer, int start = 0, int len = 0) { if (buffer == null || buffer.Length == 0) return null; if (start < 0) return null; if (len == 0) len = buffer.Length - start; int length = start + len; if (length > buffer.Length) return null; ushort crc = 0;// Initial value short iQ = 0, iR = 0; for (int i = start; i < length; i++) { // 多项式除法 // 如果该位为1 if ((buffer[i] & (0x80 >> iR)) > 0) { // 则在余数尾部添1否则添0 crc |= 0x01; } // 如果12位除数中的最高位为1，则够除 if (crc >= 0x1000) { crc ^= 0x180D; } crc <<= 1; iR++; if (8 == iR) { iR = 0; iQ++; } } // 对后面添加的12个0做处理 for (int i = 0; i < 12; i++) { if (crc >= 0x1000) { crc ^= 0x180D; } crc <<= 1; } crc >>= 1; byte[] ret = BitConverter.GetBytes(crc); Array.Reverse(ret); return ret; } /// ********************************************************************** /// Name: CRC-16/CCITT x16+x12+x5+1 /// Poly: 0x1021 /// Init: 0x0000 /// Refin: true /// Refout: true /// Xorout: 0x0000 ///************************************************************************* public static byte[] Crc13(byte[] buffer, int start = 0, int len = 0) { if (buffer == null || buffer.Length == 0) return null; if (start < 0) return null; if (len == 0) len = buffer.Length - start; int length = start + len; if (length > buffer.Length) return null; ushort crc = 0;// Initial value for (int i = start; i < length; i++) { crc ^= buffer[i]; for (int j = 0; j < 8; j++) { if ((crc & 1) > 0) crc = (ushort)((crc >> 1) ^ 0x8408);// 0x8408 = reverse 0x1021 else crc = (ushort)(crc >> 1); } } byte[] ret = BitConverter.GetBytes(crc); Array.Reverse(ret); return ret; } /// ********************************************************************** /// Name: CRC-16/CCITT FALSE x16+x12+x5+1 /// Poly: 0x1021 /// Init: 0xFFFF /// Refin: false /// Refout: false /// Xorout: 0x0000 ///************************************************************************* public static byte[] Crc14(byte[] buffer, int start = 0, int len = 0) { if (buffer == null || buffer.Length == 0) return null; if (start < 0) return null; if (len == 0) len = buffer.Length - start; int length = start + len; if (length > buffer.Length) return null; ushort crc = 0xFFFF;// Initial value for (int i = start; i < length; i++) { crc ^= (ushort)(buffer[i] << 8); for (int j = 0; j < 8; j++) { if ((crc & 0x8000) > 0) crc = (ushort)((crc << 1) ^ 0x1021); else crc = (ushort)(crc << 1); } } byte[] ret = BitConverter.GetBytes(crc); Array.Reverse(ret); return ret; } /// ********************************************************************** /// Name: CRC-16/DNP x16+x13+x12+x11+x10+x8+x6+x5+x2+1 /// Poly: 0x3D65 /// Init: 0x0000 /// Refin: true /// Refout: true /// Xorout: 0xFFFF ///************************************************************************* public static byte[] Crc15(byte[] buffer, int start = 0, int len = 0) { if (buffer == null || buffer.Length == 0) return null; if (start < 0) return null; if (len == 0) len = buffer.Length - start; int length = start + len; if (length > buffer.Length) return null; ushort crc = 0;// Initial value for (int i = start; i < length; i++) { crc ^= buffer[i]; for (int j = 0; j < 8; j++) { if ((crc & 1) > 0) crc = (ushort)((crc >> 1) ^ 0xA6BC);// 0xA6BC = reverse 0x3D65 else crc = (ushort)(crc >> 1); } } byte[] ret = BitConverter.GetBytes((ushort)~crc); Array.Reverse(ret); return ret; } /// ********************************************************************** /// Name: CRC-16/IBM x16+x15+x2+1 /// Poly: 0x8005 /// Init: 0x0000 /// Refin: true /// Refout: true /// Xorout: 0x0000 ///************************************************************************* public static byte[] Crc16(byte[] buffer, int start = 0, int len = 0) { if (buffer == null || buffer.Length == 0) return null; if (start < 0) return null; if (len == 0) len = buffer.Length - start; int length = start + len; if (length > buffer.Length) return null; ushort crc = 0;// Initial value for (int i = start; i < length; i++) { crc ^= buffer[i]; for (int j = 0; j < 8; j++) { if ((crc & 1) > 0) crc = (ushort)((crc >> 1) ^ 0xA001);// 0xA001 = reverse 0x8005 else crc = (ushort)(crc >> 1); } } byte[] ret = BitConverter.GetBytes(crc); Array.Reverse(ret); return ret; } /// ********************************************************************** /// Name: CRC-16/MAXIM x16+x15+x2+1 /// Poly: 0x8005 /// Init: 0x0000 /// Refin: true /// Refout: true /// Xorout: 0xFFFF ///************************************************************************* public static byte[] Crc17(byte[] buffer, int start = 0, int len = 0) { if (buffer == null || buffer.Length == 0) return null; if (start < 0) return null; if (len == 0) len = buffer.Length - start; int length = start + len; if (length > buffer.Length) return null; ushort crc = 0;// Initial value for (int i = start; i < length; i++) { crc ^= buffer[i]; for (int j = 0; j < 8; j++) { if ((crc & 1) > 0) crc = (ushort)((crc >> 1) ^ 0xA001);// 0xA001 = reverse 0x8005 else crc = (ushort)(crc >> 1); } } byte[] ret = BitConverter.GetBytes((ushort)~crc); Array.Reverse(ret); return ret; } /// ********************************************************************** /// Name: CRC-16/MODBUS x16+x15+x2+1 /// Poly: 0x8005 /// Init: 0xFFFF /// Refin: true /// Refout: true /// Xorout: 0x0000 ///************************************************************************* public static byte[] Crc18(byte[] buffer, int start = 0, int len = 0) { if (buffer == null || buffer.Length == 0) return null; if (start < 0) return null; if (len == 0) len = buffer.Length - start; int length = start + len; if (length > buffer.Length) return null; ushort crc = 0xFFFF;// Initial value for (int i = start; i < length; i++) { crc ^= buffer[i]; for (int j = 0; j < 8; j++) { if ((crc & 1) > 0) crc = (ushort)((crc >> 1) ^ 0xA001);// 0xA001 = reverse 0x8005 else crc = (ushort)(crc >> 1); } } byte[] ret = BitConverter.GetBytes(crc); Array.Reverse(ret); return ret; } /// ********************************************************************** /// Name: CRC-16/USB x16+x15+x2+1 /// Poly: 0x8005 /// Init: 0xFFFF /// Refin: true /// Refout: true /// Xorout: 0xFFFF ///************************************************************************* public static byte[] Crc19(byte[] buffer, int start = 0, int len = 0) { if (buffer == null || buffer.Length == 0) return null; if (start < 0) return null; if (len == 0) len = buffer.Length - start; int length = start + len; if (length > buffer.Length) return null; ushort crc = 0xFFFF;// Initial value for (int i = start; i < length; i++) { crc ^= buffer[i]; for (int j = 0; j < 8; j++) { if ((crc & 1) > 0) crc = (ushort)((crc >> 1) ^ 0xA001);// 0xA001 = reverse 0x8005 else crc = (ushort)(crc >> 1); } } byte[] ret = BitConverter.GetBytes((ushort)~crc); Array.Reverse(ret); return ret; } /// ********************************************************************** /// Name: CRC-16/X25 x16+x12+x5+1 /// Poly: 0x1021 /// Init: 0xFFFF /// Refin: true /// Refout: true /// Xorout: 0xFFFF ///************************************************************************* public static byte[] Crc20(byte[] buffer, int start = 0, int len = 0) { if (buffer == null || buffer.Length == 0) return null; if (start < 0) return null; if (len == 0) len = buffer.Length - start; int length = start + len; if (length > buffer.Length) return null; ushort crc = 0xFFFF;// Initial value for (int i = start; i < length; i++) { crc ^= buffer[i]; for (int j = 0; j < 8; j++) { if ((crc & 1) > 0) crc = (ushort)((crc >> 1) ^ 0x8408);// 0x8408 = reverse 0x1021 else crc = (ushort)(crc >> 1); } } byte[] ret = BitConverter.GetBytes((ushort)~crc); Array.Reverse(ret); return ret; } /// ********************************************************************** /// Name: CRC-16/XMODEM x16+x12+x5+1 /// Poly: 0x1021 /// Init: 0x0000 /// Refin: false /// Refout: false /// Xorout: 0x0000 ///************************************************************************* public static byte[] Crc21(byte[] buffer, int start = 0, int len = 0) { if (buffer == null || buffer.Length == 0) return null; if (start < 0) return null; if (len == 0) len = buffer.Length - start; int length = start + len; if (length > buffer.Length) return null; ushort crc = 0;// Initial value for (int i = start; i < length; i++) { crc ^= (ushort)(buffer[i] << 8); for (int j = 0; j < 8; j++) { if ((crc & 0x8000) > 0) crc = (ushort)((crc << 1) ^ 0x1021); else crc = (ushort)(crc << 1); } } byte[] ret = BitConverter.GetBytes(crc); Array.Reverse(ret); return ret; } /// ********************************************************************** /// Name: CRC32 x32+x26+x23+x22+x16+x12+x11+x10+x8+x7+x5+x4+x2+x+1 /// Poly: 0x04C11DB7 /// Init: 0xFFFFFFFF /// Refin: true /// Refout: true /// Xorout: 0xFFFFFFFF ///************************************************************************* public static byte[] Crc22(byte[] buffer, int start = 0, int len = 0) { if (buffer == null || buffer.Length == 0) return null; if (start < 0) return null; if (len == 0) len = buffer.Length - start; int length = start + len; if (length > buffer.Length) return null; uint crc = 0xFFFFFFFF;// Initial value for (int i = start; i < length; i++) { crc ^= buffer[i]; for (int j = 0; j < 8; j++) { if ((crc & 1) > 0) crc = (crc >> 1) ^ 0xEDB88320;// 0xEDB88320= reverse 0x04C11DB7 else crc = crc >> 1; } } byte[] ret = BitConverter.GetBytes(~crc); Array.Reverse(ret); return ret; } /// ********************************************************************** /// Name: CRC32/MPEG-2 x32+x26+x23+x22+x16+x12+x11+x10+x8+x7+x5+x4+x2+x+1 /// Poly: 0x04C11DB7 /// Init: 0xFFFFFFFF /// Refin: false /// Refout: false /// Xorout: 0x00000000 ///************************************************************************* public static byte[] Crc23(byte[] buffer, int start = 0, int len = 0) { if (buffer == null || buffer.Length == 0) return null; if (start < 0) return null; if (len == 0) len = buffer.Length - start; int length = start + len; if (length > buffer.Length) return null; uint crc = 0xFFFFFFFF;// Initial value for (int i = start; i < length; i++) { crc ^= (uint)(buffer[i] << 24); for (int j = 0; j < 8; j++) { if ((crc & 0x80000000) > 0) crc = (crc << 1) ^ 0x04C11DB7; else crc = crc << 1; } } byte[] ret = BitConverter.GetBytes(crc); Array.Reverse(ret); return ret; } |
检验和(checksum)，在数据处理和数据通信领域中，用于校验目的地一组数据项的和。它通常是以十六进制为数制表示的形式。如果校验和的数值超过十六进制的FF,也就是255. 就要求其补码作为校验和。通常用来在通信中，尤其是远距离通信中保证数据的完整性和准确性。
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public static byte[] allAdd(byte[] buffer, int start = 0, int len = 0) { if (buffer == null || buffer.Length == 0) return null; if (start < 0) return null; if (len == 0) len = buffer.Length - start; int length = start + len; if (length > buffer.Length) return null; byte bcc = 0;// Initial value for (int i = start; i < len; i++) { bcc ^= buffer[i]; } return new byte[] { bcc }; } |
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原文链接：https://www.cnblogs.com/ayxj/p/11481969.html
