diff options
| -rw-r--r-- | Documentation/pcmcia/crc32hash.c | 32 | ||||
| -rw-r--r-- | Documentation/pcmcia/devicetable.txt | 36 |
2 files changed, 35 insertions, 33 deletions
diff --git a/Documentation/pcmcia/crc32hash.c b/Documentation/pcmcia/crc32hash.c new file mode 100644 index 0000000000..cbc36d299a --- /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 | |||
| 11 | unsigned 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 | |||
| 23 | int 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 3351c03551..199afd100c 100644 --- a/Documentation/pcmcia/devicetable.txt +++ b/Documentation/pcmcia/devicetable.txt | |||
| @@ -27,37 +27,7 @@ pcmcia:m0149cC1ABf06pfn00fn00pa725B842DpbF1EFEE84pc0877B627pd00000000 | |||
| 27 | The hex value after "pa" is the hash of product ID string 1, after "pb" for | 27 | The hex value after "pa" is the hash of product ID string 1, after "pb" for |
| 28 | string 2 and so on. | 28 | string 2 and so on. |
| 29 | 29 | ||
| 30 | Alternatively, you can use this small tool to determine the crc32 hash. | 30 | Alternatively, you can use crc32hash (see Documentation/pcmcia/crc32hash.c) |
| 31 | simply pass the string you want to evaluate as argument to this program, | 31 | to determine the crc32 hash. Simply pass the string you want to evaluate |
| 32 | e.g. | 32 | as 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 | |||
| 42 | unsigned 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 | |||
| 54 | int 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 | } | ||
