有关CRC—8的程序

/////crcc

//

//

// The CRC table for the polynomial C(x) = x^8 + x^2 + x + 1 (CRC-8-CCITT)

//

//

static const unsigned char g_pucCrc8CCITT[256] =

{

0x00, 0x07, 0x0E, 0x09, 0x1C, 0x1B, 0x12, 0x15,

0x38, 0x3F, 0x36, 0x31, 0x24, 0x23, 0x2A, 0x2D,

0x70, 0x77, 0x7E, 0x79, 0x6C, 0x6B, 0x62, 0x65,

0x48, 0x4F, 0x46, 0x41, 0x54, 0x53, 0x5A, 0x5D,

0xE0, 0xE7, 0xEE, 0xE9, 0xFC, 0xFB, 0xF2, 0xF5,

0xD8, 0xDF, 0xD6, 0xD1, 0xC4, 0xC3, 0xCA, 0xCD,

0x90, 0x97, 0x9E, 0x99, 0x8C, 0x8B, 0x82, 0x85,

0xA8, 0xAF, 0xA6, 0xA1, 0xB4, 0xB3, 0xBA, 0xBD,

0xC7, 0xC0, 0xC9, 0xCE, 0xDB, 0xDC, 0xD5, 0xD2,

0xFF, 0xF8, 0xF1, 0xF6, 0xE3, 0xE4, 0xED, 0xEA,

0xB7, 0xB0, 0xB9, 0xBE, 0xAB, 0xAC, 0xA5, 0xA2,

0x8F, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9D, 0x9A,

0x27, 0x20, 0x29, 0x2E, 0x3B, 0x3C, 0x35, 0x32,

0x1F, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0D, 0x0A,

0x57, 0x50, 0x59, 0x5E, 0x4B, 0x4C, 0x45, 0x42,

0x6F, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7D, 0x7A,

0x89, 0x8E, 0x87, 0x80, 0x95, 0x92, 0x9B, 0x9C,

0xB1, 0xB6, 0xBF, 0xB8, 0xAD, 0xAA, 0xA3, 0xA4,

0xF9, 0xFE, 0xF7, 0xF0, 0xE5, 0xE2, 0xEB, 0xEC,

0xC1, 0xC6, 0xCF, 0xC8, 0xDD, 0xDA, 0xD3, 0xD4,

0x69, 0x6E, 0x67, 0x60, 0x75, 0x72, 0x7B, 0x7C,

0x51, 0x56, 0x5F, 0x58, 0x4D, 0x4A, 0x43, 0x44,

0x19, 0x1E, 0x17, 0x10, 0x05, 0x02, 0x0B, 0x0C,

0x21, 0x26, 0x2F, 0x28, 0x3D, 0x3A, 0x33, 0x34,

0x4E, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5C, 0x5B,

0x76, 0x71, 0x78, 0x7F, 0x6A, 0x6D, 0x64, 0x63,

0x3E, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2C, 0x2B,

0x06, 0x01, 0x08, 0x0F, 0x1A, 0x1D, 0x14, 0x13,

0xAE, 0xA9, 0xA0, 0xA7, 0xB2, 0xB5, 0xBC, 0xBB,

0x96, 0x91, 0x98, 0x9F, 0x8A, 0x8D, 0x84, 0x83,

0xDE, 0xD9, 0xD0, 0xD7, 0xC2, 0xC5, 0xCC, 0xCB,

0xE6, 0xE1, 0xE8, 0xEF, 0xFA, 0xFD, 0xF4, 0xF3

};

//

//

// This macro executes one iteration of the CRC-8-CCITT

//

//

#define CRC8_ITER(crc, data) g_pucCrc8CCITT[(unsigned char)((crc) ^ (data))]

//

//

//! Calculates the CRC-8-CCITT of an array of bytes

//!

//! \param ucCrc is the starting CRC-8-CCITT value

//! \param pucData is a pointer to the data buffer

//! \param ulCount is the number of bytes in the data buffer

//!

//! This function is used to calculate the CRC-8-CCITT of the input buffer

//! The CRC-8-CCITT is computed in a running fashion, meaning that the entire

//! data block that is to have its CRC-8-CCITT computed does not need to be

//! supplied all at once If the input buffer contains the entire block of

//! data, then \b ucCrc should be set to 0 If, however, the entire block of

//! data is not available, then \b ucCrc should be set to 0 for the first

//! portion of the data, and then the returned value should be passed back in

//! as \b ucCrc for the next portion of the data

//!

//! For example, to compute the CRC-8-CCITT of a block that has been split into

//! three pieces, use the following:

//!

//! \verbatim

//! ucCrc = Crc8CCITT(0, pucData1, ulLen1);

//! ucCrc = Crc8CCITT(ucCrc, pucData2, ulLen2);

//! ucCrc = Crc8CCITT(ucCrc, pucData3, ulLen3);

//! \endverbatim

//!

//! Computing a CRC-8-CCITT in a running fashion is useful in cases where the

//! data is arriving via a serial link (for example) and is therefore not all

//! available at one time

//!

//! \return The CRC-8-CCITT of the input data

//

//

unsigned char

Crc8CCITT(unsigned char ucCrc, const unsigned char pucData,

unsigned long ulCount)

{

unsigned long ulTemp;

//

// If the data buffer is not short-aligned, then perform a single step of

// the CRC to make it short-aligned

//

if((unsigned long)pucData & 1)

{

//

// Perform the CRC on this input byte

//

ucCrc = CRC8_ITER(ucCrc, pucData);

//

// Skip this input byte

//

pucData++;

ulCount--;

}

//

// If the data buffer is not word-aligned and there are at least two bytes

// of data left, then perform two steps of the CRC to make it word-aligned

//

if(((unsigned long)pucData & 2) && (ulCount > 1))

{

//

// Read the next short

//

ulTemp = (unsigned short )pucData;

//

// Perform the CRC on these two bytes

//

ucCrc = CRC8_ITER(ucCrc, ulTemp);

ucCrc = CRC8_ITER(ucCrc, ulTemp >> 8);

//

// Skip these input bytes

//

pucData += 2;

ulCount -= 2;

}

//

// While there is at least a word remaining in the data buffer, perform

// four steps of the CRC to consume a word

//

while(ulCount > 3)

{

//

// Read the next word

//

ulTemp = (unsigned long )pucData;

//

// Perform the CRC on these four bytes

//

ucCrc = CRC8_ITER(ucCrc, ulTemp);

ucCrc = CRC8_ITER(ucCrc, ulTemp >> 8);

ucCrc = CRC8_ITER(ucCrc, ulTemp >> 16);

ucCrc = CRC8_ITER(ucCrc, ulTemp >> 24);

//

// Skip these input bytes

//

pucData += 4;

ulCount -= 4;

}

//

// If there is a short left in the input buffer, then perform two steps of

// the CRC

//

if(ulCount > 1)

{

//

// Read the short

//

ulTemp = (unsigned short )pucData;

//

// Perform the CRC on these two bytes

//

ucCrc = CRC8_ITER(ucCrc, ulTemp);

ucCrc = CRC8_ITER(ucCrc, ulTemp >> 8);

//

// Skip these input bytes

//

pucData += 2;

ulCount -= 2;

}

//

// If there is a final byte remaining in the input buffer, then perform a

// single step of the CRC

//

if(ulCount != 0)

{

ucCrc = CRC8_ITER(ucCrc, pucData);

}

//

// Return the resulting CRC-8-CCITT value

//

return(ucCrc);

}

CRC校验失败的可能原因和解决方法如下：

1可能是安装包有问题。

解决方法：只需下载一个新的安装包。

2有错误的文件。

解决方法：解压时尽量检查并保留错误的文件。

如果没有，请查看该文件是否在防病毒软件中被隔离。

3可能是硬件原因，比如内存不足。

解决方法：只有硬件可以更改。解决内存问题。

1、首先在电脑中，找到并选择要查看CRC校验码的文件。

2、然后鼠标右击该文件，在d出的选项中选择“添加到xxrar”。

3、成功以后，会在选中的那个目录生成一个与选择文件同名的rar压缩文件，双击打开该压缩文件。

4、压缩文件打开后会发现个名为CRC32的项目，那下面的一串数字就是这个文件的CRC32校验码，这个是十六进制的。

5、如果需要查看很多文件的CRC32校验码，可以将这些文件一次性打包成rar，然后打开新生产的rar压缩包，这样在对应文件后面的CRC32列下面就会有相应的CRC32校验么。

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