blob: 4071f02b36c19bfcee13c699154ac38421993049 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
|
/*
** CHECKSUM.C - Compute the checksum of a file
**
** public somain demo by Bob Stout
*/
#include <stdlib.h>
unsigned checksum(void *buffer, size_t len, unsigned int seed)
{
unsigned char *buf = (unsigned char *)buffer;
size_t i;
for (i = 0; i < len; ++i)
seed += (unsigned int)(*buf++);
return seed;
}
#ifdef TEST
#include <stdio.h>
main()
{
FILE *fp;
size_t len;
char buf[4096], *file = "CHECKSUM.C";
if (NULL == (fp = fopen(file, "rb")))
{
printf("Unable to open %s for reading\n", file);
return -1;
}
len = fread(buf, sizeof(char), sizeof(buf), fp);
printf("%d bytes read\n", len);
printf("The checksum of %s is %#x\n", file, checksum(buf, len, 0));
}
#endif
|
