#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
unsigned int do_crc(unsigned char *ptr, int len)
{
unsigned int i;
unsigned int crc = 0xFFFFFFFF;
while(len--)
{
crc ^= (unsigned int)(*ptr++) << 24;
for (i = 0; i < 8; ++i)
{
if (crc & 0x80000000)
crc = (crc << 1) ^ 0x04C11DB7;
else
crc <<= 1;
}
}
return crc;
}
/*psm crc */
char crctest[256] =
{
0x00, 0x00, 0x01, 0xBC, 0x00, 0x5E, 0xE9, 0xFF, 0x00, 0x24,
0x40, 0x0E, 0x48, 0x4B, 0x01, 0x00, 0x17, 0x6A ,0x96, 0xF6,
0x20, 0x00 ,0x00 ,0xFF, 0xFF ,0xFF ,0x41 ,0x12 ,0x48 ,0x4B,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x24,
0xE0, 0x00 ,0x1C ,0x42 ,0x0E ,0x00 ,0x00, 0x60, 0x00 ,0x03,
0xC0, 0x02, 0x40 ,0x02 ,0x0F, 0xFF ,0x00, 0x3A ,0x98, 0x44,
0x0A ,0x00, 0x00, 0x80, 0x00 ,0x00, 0x00, 0x00, 0x00, 0xFF,
0xFF ,0x91 ,0xC0 ,0x00, 0x0C ,0x43 ,0x0A ,0x01 ,0x40, 0xFE,
0x00, 0x7D ,0x03 ,0x00,0x7D ,0x03 ,0xFF
};
int main()
{
int crc32 = do_crc(crctest, 96);
printf("crc is 0x%x\n", crc32);
}
