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-rw-r--r--Documentation/pcmcia/crc32hash.c32
-rw-r--r--Documentation/pcmcia/devicetable.txt36
2 files changed, 35 insertions, 33 deletions
diff --git a/Documentation/pcmcia/crc32hash.c b/Documentation/pcmcia/crc32hash.c
new file mode 100644
index 000000000000..cbc36d299af8
--- /dev/null
+++ b/Documentation/pcmcia/crc32hash.c
@@ -0,0 +1,32 @@
1/* crc32hash.c - derived from linux/lib/crc32.c, GNU GPL v2 */
2/* Usage example:
3$ ./crc32hash "Dual Speed"
4*/
5
6#include <string.h>
7#include <stdio.h>
8#include <ctype.h>
9#include <stdlib.h>
10
11unsigned int crc32(unsigned char const *p, unsigned int len)
12{
13 int i;
14 unsigned int crc = 0;
15 while (len--) {
16 crc ^= *p++;
17 for (i = 0; i < 8; i++)
18 crc = (crc >> 1) ^ ((crc & 1) ? 0xedb88320 : 0);
19 }
20 return crc;
21}
22
23int main(int argc, char **argv) {
24 unsigned int result;
25 if (argc != 2) {
26 printf("no string passed as argument\n");
27 return -1;
28 }
29 result = crc32(argv[1], strlen(argv[1]));
30 printf("0x%x\n", result);
31 return 0;
32}
diff --git a/Documentation/pcmcia/devicetable.txt b/Documentation/pcmcia/devicetable.txt
index 3351c0355143..199afd100cf2 100644
--- a/Documentation/pcmcia/devicetable.txt
+++ b/Documentation/pcmcia/devicetable.txt
@@ -27,37 +27,7 @@ pcmcia:m0149cC1ABf06pfn00fn00pa725B842DpbF1EFEE84pc0877B627pd00000000
27The hex value after "pa" is the hash of product ID string 1, after "pb" for 27The hex value after "pa" is the hash of product ID string 1, after "pb" for
28string 2 and so on. 28string 2 and so on.
29 29
30Alternatively, you can use this small tool to determine the crc32 hash. 30Alternatively, you can use crc32hash (see Documentation/pcmcia/crc32hash.c)
31simply pass the string you want to evaluate as argument to this program, 31to determine the crc32 hash. Simply pass the string you want to evaluate
32e.g. 32as argument to this program, e.g.:
33$ ./crc32hash "Dual Speed" 33$ ./crc32hash "Dual Speed"
34
35-------------------------------------------------------------------------
36/* crc32hash.c - derived from linux/lib/crc32.c, GNU GPL v2 */
37#include <string.h>
38#include <stdio.h>
39#include <ctype.h>
40#include <stdlib.h>
41
42unsigned int crc32(unsigned char const *p, unsigned int len)
43{
44 int i;
45 unsigned int crc = 0;
46 while (len--) {
47 crc ^= *p++;
48 for (i = 0; i < 8; i++)
49 crc = (crc >> 1) ^ ((crc & 1) ? 0xedb88320 : 0);
50 }
51 return crc;
52}
53
54int main(int argc, char **argv) {
55 unsigned int result;
56 if (argc != 2) {
57 printf("no string passed as argument\n");
58 return -1;
59 }
60 result = crc32(argv[1], strlen(argv[1]));
61 printf("0x%x\n", result);
62 return 0;
63}