crc程序怎么写

时间:2025-01-25 03:29:18 单机游戏

CRC(循环冗余校验)程序可以通过多种编程语言实现,包括C语言、Python等。下面我将提供几个不同CRC算法的C语言实现示例。

CRC-4 实现

```c

include

uint8_t crc4_D(uint8_t data) {

uint8_t crc = 0;

uint8_t poly = 0x09;

int i;

poly = poly << 4;

crc = data;

for (i = 0; i < 8; i++) {

if (crc & 0x80)

crc = (crc << 1) ^ poly;

else

crc = crc << 1;

}

return crc;

}

```

CRC-32 实现

```c

include

uint32_t cfgCrc32(const unsigned char *pSrc, int nSize) {

int i, j, nIdx = 0;

unsigned int byte, crc, mask;

static unsigned int table;

if (table == 0) {

for (byte = 0; byte < 256; byte++) {

mask = -(byte & 1);

crc = (crc >> 1) ^ (0xEDB88320 & mask);

table[byte] = crc;

}

}

crc = 0xFFFFFFFF;

for (; nIdx < nSize; nIdx++) {

crc ^= pSrc[nIdx];

for (i = 0; i < 8; i++) {

if (crc & 0x80000000)

crc = (crc << 1) ^ 0xEDB88320;

else

crc <<= 1;

}

}

return ~crc;

}

```

CRC-16 实现

```c

include

uint16_t crc16(uint16_t data, uint16_t polynomial) {

uint16_t crc = 0xFFFF;

for (int i = 0; i < 16; i++) {

if (crc & 0x8000) {

crc = (crc << 1) ^ polynomial;

} else {

crc <<= 1;

}

crc &= 0xFFFF;

}

crc ^= data;

return crc;

}

```

使用示例

```c

include

int main() {

uint8_t data = 0xB3;

uint8_t crc = crc4_D(data);

printf("CRC-4 of %02X is %02X\n", data, crc);

uint32_t data32 = 0x12345678;

uint32_t crc32 = cfgCrc32((unsigned char*)&data32, sizeof(data32));

printf("CRC-32 of %08X is %08X\n", data32, crc32);

uint16_t data16 = 0xABCD;

uint16_t crc16 = crc16(data16, 0x1021);

printf("CRC-16 of %04X is %04X\n", data16, crc16);

return 0;

}

```

这些示例展示了如何实现和计算不同数据长度的CRC值。你可以根据需要选择合适的CRC算法和参数。