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#include <stdio.h>
#include <openbsc/tlv.h>
int tlv_dump(struct tlv_parsed *dec)
{
int i;
for (i = 0; i <= 0xff; i++) {
if (!dec->lv[i].val)
continue;
printf("T=%02x L=%d\n", i, dec->lv[i].len);
}
return 0;
}
int tlv_parse(struct tlv_parsed *dec, const struct tlv_definition *def,
const u_int8_t *buf, int buf_len)
{
u_int8_t tag, len = 1;
const u_int8_t *pos;
int num_parsed = 0;
memset(dec, 0, sizeof(*dec));
for (pos = buf; pos < buf+buf_len; pos += len) {
tag = *pos;
/* FIXME: use tables for knwon IEI */
switch (def->def[tag].type) {
case TLV_TYPE_T:
/* GSM TS 04.07 11.2.4: Type 1 TV or Type 2 T */
dec->lv[tag].val = pos;
dec->lv[tag].len = 0;
len = 1;
num_parsed++;
break;
case TLV_TYPE_TV:
dec->lv[tag].val = pos+1;
dec->lv[tag].len = 1;
len = 2;
num_parsed++;
break;
case TLV_TYPE_FIXED:
dec->lv[tag].val = pos+1;
dec->lv[tag].len = def->def[tag].fixed_len;
len = def->def[tag].fixed_len + 1;
num_parsed++;
break;
case TLV_TYPE_TLV:
/* GSM TS 04.07 11.2.4: Type 4 TLV */
if (pos + 1 > buf + buf_len)
return -1;
dec->lv[tag].val = pos+2;
dec->lv[tag].len = *(pos+1);
len = dec->lv[tag].len + 2;
if (pos + len > buf + buf_len)
return -2;
num_parsed++;
break;
case TLV_TYPE_TL16V:
if (pos + 2 > buf + buf_len)
return -1;
dec->lv[tag].val = pos+3;
dec->lv[tag].len = *(pos+1) << 8 | *(pos+2);
len = dec->lv[tag].len + 3;
if (pos + len > buf + buf_len)
return -2;
num_parsed++;
break;
}
}
//tlv_dump(dec);
return num_parsed;
}
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