/* computes string to be appended to cstr so that src would be added to
* the compression (best case, it's a 2-byte pointer to some offset within
* cstr; worst case, it's all of src, converted to rfc3011 format).
* The computed string is returned directly; its length is returned via retlen;
* NULL and 0, respectively, are returned if an error occurs.
*/
uint8_t* FAST_FUNC dname_enc(const uint8_t *cstr, int clen, const char *src, int *retlen)
{
uint8_t *d, *dname;
int off;
dname = convert_dname(src);
if (dname == NULL) {
*retlen = 0;
return NULL;
}
for (d = dname; *d != 0; d += *d + 1) {
off = find_offset(cstr, clen, d);
if (off >= 0) { /* found a match, add pointer and terminate string */
*d++ = NS_CMPRSFLGS;
*d = off;
break;
}
}
*retlen = d - dname + 1;
return dname;
}
/* Computes string to be appended to cstr so that src would be added to
* the compression (best case, it's a 2-byte pointer to some offset within
* cstr; worst case, it's all of src, converted to <4>host<3>com<0> format).
* The computed string is returned directly; its length is returned via retlen;
* NULL and 0, respectively, are returned if an error occurs.
*/
uint8_t* FAST_FUNC dname_enc(const uint8_t *cstr, int clen, const char *src, int *retlen)
{
uint8_t *d, *dname;
int off;
dname = convert_dname(src);
if (dname == NULL) {
*retlen = 0;
return NULL;
}
d = dname;
while (*d) {
if (cstr) {
off = find_offset(cstr, clen, d);
if (off >= 0) { /* found a match, add pointer and return */
*d++ = NS_CMPRSFLGS | (off >> 8);
*d = off;
break;
}
}
d += *d + 1;
}
