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can-utils
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Added CRC8 profiles to handle additional data for checksum generation.

pull/7/head
Oliver Hartkopp 2010-04-16 08:46:17 +00:00
parent 9e8f9200fb
commit c6b3ceff83
1 changed files with 89 additions and 1 deletions
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90
cangw.c
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@ -138,6 +138,35 @@ void print_cs_xor(struct cgw_csum_xor *cs_xor)
cs_xor->result_idx, cs_xor->init_xor_val);
}
void print_cs_crc8_profile(struct cgw_csum_crc8 *cs_crc8)
{
int i;
printf("-p %d:", cs_crc8->profile);
switch (cs_crc8->profile) {
case CGW_CRC8PRF_1U8:
printf("%02X", cs_crc8->profile_data[0]);
break;
case CGW_CRC8PRF_16U8:
for (i = 0; i < 16; i++)
printf("%02X", cs_crc8->profile_data[i]);
break;
case CGW_CRC8PRF_SFFID_XOR:
break;
default:
printf("<unknown profile #%d>", cs_crc8->profile);
}
printf(" ");
}
void print_cs_crc8(struct cgw_csum_crc8 *cs_crc8)
{
int i;
@ -151,6 +180,9 @@ void print_cs_crc8(struct cgw_csum_crc8 *cs_crc8)
printf("%02X", cs_crc8->crctab[i]);
printf(" ");
if (cs_crc8->profile != CGW_CRC8PRF_UNSPEC)
print_cs_crc8_profile(cs_crc8);
}
void print_usage(char *prg)
@ -166,6 +198,9 @@ void print_usage(char *prg)
fprintf(stderr, " -e (echo sent frames - recommended on vcanx)\n");
fprintf(stderr, " -f <filter> (set CAN filter)\n");
fprintf(stderr, " -m <mod> (set frame modifications)\n");
fprintf(stderr, " -x <from_idx>:<to_idx>:<result_idx>:<init_xor_val> (XOR checksum)\n");
fprintf(stderr, " -c <from>:<to>:<result>:<init_val>:<xor_val>:<crctab[256]> (CRC8 cs)\n");
fprintf(stderr, " -p <profile>:[<profile_data>] (CRC8 checksum profile & parameters)\n");
fprintf(stderr, "\nValues are given and expected in hexadecimal values. Leading 0s can be omitted.\n");
fprintf(stderr, "\n");
fprintf(stderr, "<filter> is a <value>:<mask> CAN identifier filter\n");
@ -182,6 +217,11 @@ void print_usage(char *prg)
fprintf(stderr, "Example:\n");
fprintf(stderr, "%s -A -s can0 -d vcan3 -e -f 123:C00007FF -m SET:IL:333.4.1122334455667788\n", prg);
fprintf(stderr, "\n");
fprintf(stderr, "Supported CRC 8 profiles:\n");
fprintf(stderr, "Profile '%d' (1U8) - add one additional u8 value\n", CGW_CRC8PRF_1U8);
fprintf(stderr, "Profile '%d' (16U8) - add u8 value from table[16] indexed by (data[1] & 0xF)\n", CGW_CRC8PRF_16U8);
fprintf(stderr, "Profile '%d' (SFFID_XOR) - add u8 value (can_id & 0xFF) ^ (can_id >> 8 & 0xFF)\n", CGW_CRC8PRF_SFFID_XOR);
fprintf(stderr, "\n");
}
int b64hex(char *asc, unsigned char *bin, int len)
@ -195,6 +235,45 @@ int b64hex(char *asc, unsigned char *bin, int len)
return 0;
}
int parse_crc8_profile(char *optarg, struct cgw_csum_crc8 *crc8)
{
int ret = 1;
char *ptr;
if (sscanf(optarg, "%hhd:", &crc8->profile) != 1)
return ret;
switch (crc8->profile) {
case CGW_CRC8PRF_1U8:
if (sscanf(optarg, "%hhd:%2hhx", &crc8->profile, &crc8->profile_data[0]) == 2)
ret = 0;
break;
case CGW_CRC8PRF_16U8:
ptr = strchr(optarg, ':');
/* check if length contains 16 base64 hex values */
if (ptr != NULL &&
strlen(ptr) == strlen(":00112233445566778899AABBCCDDEEFF") &&
b64hex(ptr+1, (unsigned char *)&crc8->profile_data[0], 16) == 0)
ret = 0;
break;
case CGW_CRC8PRF_SFFID_XOR:
/* no additional parameters needed */
ret = 0;
break;
}
return ret;
}
int parse_mod(char *optarg, struct modattr *modmsg)
{
char *ptr, *nptr;
@ -469,8 +548,10 @@ int main(int argc, char **argv)
int i;
memset(&req, 0, sizeof(req));
memset(&cs_xor, 0, sizeof(cs_xor));
memset(&cs_crc8, 0, sizeof(cs_crc8));
while ((opt = getopt(argc, argv, "ADFLs:d:tef:c:x:m:?")) != -1) {
while ((opt = getopt(argc, argv, "ADFLs:d:tef:c:p:x:m:?")) != -1) {
switch (opt) {
case 'A':
@ -545,6 +626,13 @@ int main(int argc, char **argv)
}
break;
case 'p':
if (parse_crc8_profile(optarg, &cs_crc8)) {
printf("Bad CRC8 profile definition '%s'.\n", optarg);
exit(1);
}
break;
case 'm':
/* may be triggered by each of the CGW_MOD_FUNCS functions */
if ((modidx < CGW_MOD_FUNCS) && (err = parse_mod(optarg, &modmsg[modidx++]))) {