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add dns_rdataslab_tordataset()

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This commit is contained in:
Brian Wellington
2002-02-20 22:57:13 +00:00
parent e1cbf95aec
commit 8cf24d101a
2 changed files with 131 additions and 2 deletions
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115
lib/dns/rdataslab.c
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@@ -15,7 +15,7 @@
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: rdataslab.c,v 1.29 2001/01/09 21:51:25 bwelling Exp $ */
/* $Id: rdataslab.c,v 1.30 2002/02/20 22:57:12 bwelling Exp $ */
#include <config.h>
@@ -152,6 +152,119 @@ dns_rdataslab_fromrdataset(dns_rdataset_t *rdataset, isc_mem_t *mctx,
return (result);
}
static void
rdataset_disassociate(dns_rdataset_t *rdataset) {
UNUSED(rdataset);
}
static isc_result_t
rdataset_first(dns_rdataset_t *rdataset) {
unsigned char *raw = rdataset->private3;
unsigned int count;
count = raw[0] * 256 + raw[1];
if (count == 0) {
rdataset->private5 = NULL;
return (ISC_R_NOMORE);
}
raw += 2;
/*
* The private4 field is the number of rdata beyond the cursor
* position, so we decrement the total count by one before storing
* it.
*/
count--;
rdataset->private4 = (void *)count;
rdataset->private5 = raw;
return (ISC_R_SUCCESS);
}
static isc_result_t
rdataset_next(dns_rdataset_t *rdataset) {
unsigned int count;
unsigned int length;
unsigned char *raw;
count = (unsigned int)rdataset->private4;
if (count == 0)
return (ISC_R_NOMORE);
count--;
rdataset->private4 = (void *)count;
raw = rdataset->private5;
length = raw[0] * 256 + raw[1];
raw += length + 2;
rdataset->private5 = raw;
return (ISC_R_SUCCESS);
}
static void
rdataset_current(dns_rdataset_t *rdataset, dns_rdata_t *rdata) {
unsigned char *raw = rdataset->private5;
isc_region_t r;
REQUIRE(raw != NULL);
r.length = raw[0] * 256 + raw[1];
raw += 2;
r.base = raw;
dns_rdata_fromregion(rdata, rdataset->rdclass, rdataset->type, &r);
}
static void
rdataset_clone(dns_rdataset_t *source, dns_rdataset_t *target) {
*target = *source;
/*
* Reset iterator state.
*/
target->private4 = NULL;
target->private5 = NULL;
}
static unsigned int
rdataset_count(dns_rdataset_t *rdataset) {
unsigned char *raw = rdataset->private3;
unsigned int count;
count = raw[0] * 256 + raw[1];
return (count);
}
static dns_rdatasetmethods_t rdataset_methods = {
rdataset_disassociate,
rdataset_first,
rdataset_next,
rdataset_current,
rdataset_clone,
rdataset_count
};
void
dns_rdataslab_tordataset(unsigned char *slab, unsigned int reservelen,
dns_rdataclass_t rdclass, dns_rdatatype_t rdtype,
dns_rdatatype_t covers, dns_ttl_t ttl,
dns_rdataset_t *rdataset)
{
rdataset->methods = &rdataset_methods;
rdataset->rdclass = rdclass;
rdataset->type = rdtype;
rdataset->covers = covers;
rdataset->ttl = ttl;
rdataset->trust = 0;
rdataset->private1 = NULL;
rdataset->private2 = NULL;
rdataset->private3 = slab + reservelen;
/*
* Reset iterator state.
*/
rdataset->private4 = NULL;
rdataset->private5 = NULL;
}
unsigned int
dns_rdataslab_size(unsigned char *slab, unsigned int reservelen) {
unsigned int count, length;