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c# – 用于跨平台应用程序的CRC

发布时间:2020-12-16 01:35:37 所属栏目:百科 来源:网络整理
导读:我希望在VB.NET或C#应用程序以及C / Linux应用程序中使用通用CRC逻辑.我有一个与Web服务(用C#编写)和Web应用程序(用VB.NET编写)交互的C / Linux应用程序.对于某些数据,我想从.NET端向数据本身(比如文件)添加CRC,并检查客户端上数据的完整性(检查CRC),反之亦
我希望在VB.NET或C#应用程序以及C / Linux应用程序中使用通用CRC逻辑.我有一个与Web服务(用C#编写)和Web应用程序(用VB.NET编写)交互的C / Linux应用程序.对于某些数据,我想从.NET端向数据本身(比如文件)添加CRC,并检查客户端上数据的完整性(检查CRC),反之亦然.

有人可以指导我吗?

解决方法

由于CRC实施是单行的,我认为你没有任何问题.维基百科有几种不同语言的CRC源代码链接.关于可移植性,唯一需要关心的是当您将CRC实际存储在文件中时的字节序.

编辑:真的,使用单线程重复代码不会有问题.

C或C版本

const uint16_t table[256] = {
 0x0000,0x1189,0x2312,0x329B,0x4624,0x57AD,0x6536,0x74BF,0x8C48,0x9DC1,0xAF5A,0xBED3,0xCA6C,0xDBE5,0xE97E,0xF8F7,0x1081,0x0108,0x3393,0x221A,0x56A5,0x472C,0x75B7,0x643E,0x9CC9,0x8D40,0xBFDB,0xAE52,0xDAED,0xCB64,0xF9FF,0xE876,0x2102,0x308B,0x0210,0x1399,0x6726,0x76AF,0x4434,0x55BD,0xAD4A,0xBCC3,0x8E58,0x9FD1,0xEB6E,0xFAE7,0xC87C,0xD9F5,0x3183,0x200A,0x1291,0x0318,0x77A7,0x662E,0x54B5,0x453C,0xBDCB,0xAC42,0x9ED9,0x8F50,0xFBEF,0xEA66,0xD8FD,0xC974,0x4204,0x538D,0x6116,0x709F,0x0420,0x15A9,0x2732,0x36BB,0xCE4C,0xDFC5,0xED5E,0xFCD7,0x8868,0x99E1,0xAB7A,0xBAF3,0x5285,0x430C,0x7197,0x601E,0x14A1,0x0528,0x37B3,0x263A,0xDECD,0xCF44,0xFDDF,0xEC56,0x98E9,0x8960,0xBBFB,0xAA72,0x6306,0x728F,0x4014,0x519D,0x2522,0x34AB,0x0630,0x17B9,0xEF4E,0xFEC7,0xCC5C,0xDDD5,0xA96A,0xB8E3,0x8A78,0x9BF1,0x7387,0x620E,0x5095,0x411C,0x35A3,0x242A,0x16B1,0x0738,0xFFCF,0xEE46,0xDCDD,0xCD54,0xB9EB,0xA862,0x9AF9,0x8B70,0x8408,0x9581,0xA71A,0xB693,0xC22C,0xD3A5,0xE13E,0xF0B7,0x0840,0x19C9,0x2B52,0x3ADB,0x4E64,0x5FED,0x6D76,0x7CFF,0x9489,0x8500,0xB79B,0xA612,0xD2AD,0xC324,0xF1BF,0xE036,0x18C1,0x0948,0x3BD3,0x2A5A,0x5EE5,0x4F6C,0x7DF7,0x6C7E,0xA50A,0xB483,0x8618,0x9791,0xE32E,0xF2A7,0xC03C,0xD1B5,0x2942,0x38CB,0x0A50,0x1BD9,0x6F66,0x7EEF,0x4C74,0x5DFD,0xB58B,0xA402,0x9699,0x8710,0xF3AF,0xE226,0xD0BD,0xC134,0x39C3,0x284A,0x1AD1,0x0B58,0x7FE7,0x6E6E,0x5CF5,0x4D7C,0xC60C,0xD785,0xE51E,0xF497,0x8028,0x91A1,0xA33A,0xB2B3,0x4A44,0x5BCD,0x6956,0x78DF,0x0C60,0x1DE9,0x2F72,0x3EFB,0xD68D,0xC704,0xF59F,0xE416,0x90A9,0x8120,0xB3BB,0xA232,0x5AC5,0x4B4C,0x79D7,0x685E,0x1CE1,0x0D68,0x3FF3,0x2E7A,0xE70E,0xF687,0xC41C,0xD595,0xA12A,0xB0A3,0x8238,0x93B1,0x6B46,0x7ACF,0x4854,0x59DD,0x2D62,0x3CEB,0x0E70,0x1FF9,0xF78F,0xE606,0xD49D,0xC514,0xB1AB,0xA022,0x92B9,0x8330,0x7BC7,0x6A4E,0x58D5,0x495C,0x3DE3,0x2C6A,0x1EF1,0x0F78
};

void crc_update(uint8_t by,uint16_t& crc)
{
    crc = table[by ^ (uint8_t)(crc >> (16 - 8))] ^ (crc << 8);
}

C#版本

readonly UInt16[] table = new UInt16[256] { 0x0000,... };
void crc_update(Byte by,ref UInt16 crc)
{
    crc = (UInt16)(table[by ^ (crc >> (16 - 8))] ^ (crc << 8));
}

VB.NET版本

ReadOnly table As UInt16() = { &H0000,&H1189,... }
Sub crc_update(ByVal by As System.Byte,ByRef crc As UInt16)
    crc = table(by Xor (crc >> (16 - 8))) Xor (crc << 8)
End Sub

要使用CCITT以外的16位CRC,请替换查找表.对于32位CRC,将所有出现的16替换为32并替换查找表.

(编辑:李大同)

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