2 * Copyright (C) 2004-2011 Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (C) 1999-2003 Internet Software Consortium.
5 * Permission to use, copy, modify, and/or distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
10 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
11 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
12 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
13 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
14 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
15 * PERFORMANCE OF THIS SOFTWARE.
18 /* $Id: rdataslab.c,v 1.52.148.2 2011-02-28 01:20:02 tbox Exp $ */
27 #include <isc/region.h>
28 #include <isc/string.h> /* Required for HP/UX (and others?) */
31 #include <dns/result.h>
32 #include <dns/rdata.h>
33 #include <dns/rdataset.h>
34 #include <dns/rdataslab.h>
37 * The rdataslab structure allows iteration to occur in both load order
38 * and DNSSEC order. The structure is as follows:
40 * header (reservelen bytes)
41 * record count (2 bytes)
42 * offset table (4 x record count bytes in load order)
44 * data length (2 bytes)
46 * meta data (1 byte for RRSIG's)
47 * data (data length bytes)
49 * If DNS_RDATASET_FIXED is defined to be zero (0) the format of a
50 * rdataslab is as follows:
52 * header (reservelen bytes)
53 * record count (2 bytes)
55 * data length (2 bytes)
56 * data (data length bytes)
58 * Offsets are from the end of the header.
60 * Load order traversal is performed by walking the offset table to find
61 * the start of the record (DNS_RDATASET_FIXED = 1).
63 * DNSSEC order traversal is performed by walking the data records.
65 * The order is stored with record to allow for efficient reconstruction
66 * of the offset table following a merge or subtraction.
68 * The iterator methods here currently only support DNSSEC order iteration.
70 * The iterator methods in rbtdb support both load order and DNSSEC order
74 * rbtdb.c directly interacts with the slab's raw structures. If the
75 * structure changes then rbtdb.c also needs to be updated to reflect
76 * the changes. See the areas tagged with "RDATASLAB".
84 /*% Note: the "const void *" are just to make qsort happy. */
86 compare_rdata(const void *p1, const void *p2) {
87 const struct xrdata *x1 = p1;
88 const struct xrdata *x2 = p2;
89 return (dns_rdata_compare(&x1->rdata, &x2->rdata));
92 #if DNS_RDATASET_FIXED
94 fillin_offsets(unsigned char *offsetbase, unsigned int *offsettable,
100 for (i = 0, j = 0; i < length; i++) {
102 if (offsettable[i] == 0)
106 * Fill in offset table.
108 raw = &offsetbase[j*4 + 2];
109 *raw++ = (offsettable[i] & 0xff000000) >> 24;
110 *raw++ = (offsettable[i] & 0xff0000) >> 16;
111 *raw++ = (offsettable[i] & 0xff00) >> 8;
112 *raw = offsettable[i] & 0xff;
115 * Fill in table index.
117 raw = offsetbase + offsettable[i] + 2;
118 *raw++ = (j & 0xff00) >> 8;
125 dns_rdataslab_fromrdataset(dns_rdataset_t *rdataset, isc_mem_t *mctx,
126 isc_region_t *region, unsigned int reservelen)
129 unsigned char *rawbuf;
130 #if DNS_RDATASET_FIXED
131 unsigned char *offsetbase;
138 #if DNS_RDATASET_FIXED
139 unsigned int *offsettable;
143 buflen = reservelen + 2;
145 nalloc = dns_rdataset_count(rdataset);
147 if (nitems == 0 && rdataset->type != 0)
148 return (ISC_R_FAILURE);
151 return (ISC_R_NOSPACE);
155 x = isc_mem_get(mctx, nalloc * sizeof(struct xrdata));
157 return (ISC_R_NOMEMORY);
162 * Save all of the rdata members into an array.
164 result = dns_rdataset_first(rdataset);
165 if (result != ISC_R_SUCCESS && result != ISC_R_NOMORE)
167 for (i = 0; i < nalloc && result == ISC_R_SUCCESS; i++) {
168 INSIST(result == ISC_R_SUCCESS);
169 dns_rdata_init(&x[i].rdata);
170 dns_rdataset_current(rdataset, &x[i].rdata);
171 #if DNS_RDATASET_FIXED
174 result = dns_rdataset_next(rdataset);
176 if (result != ISC_R_NOMORE)
180 * Somehow we iterated over fewer rdatas than
181 * dns_rdataset_count() said there were!
183 result = ISC_R_FAILURE;
188 * Put into DNSSEC order.
190 qsort(x, nalloc, sizeof(struct xrdata), compare_rdata);
193 * Remove duplicates and compute the total storage required.
195 * If an rdata is not a duplicate, accumulate the storage size
196 * required for the rdata. We do not store the class, type, etc,
197 * just the rdata, so our overhead is 2 bytes for the number of
198 * records, and 8 for each rdata, (length(2), offset(4) and order(2))
199 * and then the rdata itself.
201 for (i = 1; i < nalloc; i++) {
202 if (compare_rdata(&x[i-1].rdata, &x[i].rdata) == 0) {
203 x[i-1].rdata.data = NULL;
204 x[i-1].rdata.length = 0;
205 #if DNS_RDATASET_FIXED
207 * Preserve the least order so A, B, A -> A, B
208 * after duplicate removal.
210 if (x[i-1].order < x[i].order)
211 x[i].order = x[i-1].order;
215 #if DNS_RDATASET_FIXED
216 buflen += (8 + x[i-1].rdata.length);
218 buflen += (2 + x[i-1].rdata.length);
221 * Provide space to store the per RR meta data.
223 if (rdataset->type == dns_rdatatype_rrsig)
228 * Don't forget the last item!
231 #if DNS_RDATASET_FIXED
232 buflen += (8 + x[i-1].rdata.length);
234 buflen += (2 + x[i-1].rdata.length);
239 * Provide space to store the per RR meta data.
241 if (rdataset->type == dns_rdatatype_rrsig)
245 * Ensure that singleton types are actually singletons.
247 if (nitems > 1 && dns_rdatatype_issingleton(rdataset->type)) {
249 * We have a singleton type, but there's more than one
250 * RR in the rdataset.
252 result = DNS_R_SINGLETON;
257 * Allocate the memory, set up a buffer, start copying in
260 rawbuf = isc_mem_get(mctx, buflen);
261 if (rawbuf == NULL) {
262 result = ISC_R_NOMEMORY;
266 #if DNS_RDATASET_FIXED
267 /* Allocate temporary offset table. */
268 offsettable = isc_mem_get(mctx, nalloc * sizeof(unsigned int));
269 if (offsettable == NULL) {
270 isc_mem_put(mctx, rawbuf, buflen);
271 result = ISC_R_NOMEMORY;
274 memset(offsettable, 0, nalloc * sizeof(unsigned int));
277 region->base = rawbuf;
278 region->length = buflen;
280 rawbuf += reservelen;
281 #if DNS_RDATASET_FIXED
285 *rawbuf++ = (nitems & 0xff00) >> 8;
286 *rawbuf++ = (nitems & 0x00ff);
288 #if DNS_RDATASET_FIXED
289 /* Skip load order table. Filled in later. */
290 rawbuf += nitems * 4;
293 for (i = 0; i < nalloc; i++) {
294 if (x[i].rdata.data == NULL)
296 #if DNS_RDATASET_FIXED
297 offsettable[x[i].order] = rawbuf - offsetbase;
299 length = x[i].rdata.length;
300 if (rdataset->type == dns_rdatatype_rrsig)
302 *rawbuf++ = (length & 0xff00) >> 8;
303 *rawbuf++ = (length & 0x00ff);
304 #if DNS_RDATASET_FIXED
305 rawbuf += 2; /* filled in later */
308 * Store the per RR meta data.
310 if (rdataset->type == dns_rdatatype_rrsig) {
311 *rawbuf++ |= (x[i].rdata.flags & DNS_RDATA_OFFLINE) ?
312 DNS_RDATASLAB_OFFLINE : 0;
314 memcpy(rawbuf, x[i].rdata.data, x[i].rdata.length);
315 rawbuf += x[i].rdata.length;
318 #if DNS_RDATASET_FIXED
319 fillin_offsets(offsetbase, offsettable, nalloc);
320 isc_mem_put(mctx, offsettable, nalloc * sizeof(unsigned int));
323 result = ISC_R_SUCCESS;
327 isc_mem_put(mctx, x, nalloc * sizeof(struct xrdata));
332 rdataset_disassociate(dns_rdataset_t *rdataset) {
337 rdataset_first(dns_rdataset_t *rdataset) {
338 unsigned char *raw = rdataset->private3;
341 count = raw[0] * 256 + raw[1];
343 rdataset->private5 = NULL;
344 return (ISC_R_NOMORE);
346 #if DNS_RDATASET_FIXED
347 raw += 2 + (4 * count);
352 * The privateuint4 field is the number of rdata beyond the cursor
353 * position, so we decrement the total count by one before storing
357 rdataset->privateuint4 = count;
358 rdataset->private5 = raw;
360 return (ISC_R_SUCCESS);
364 rdataset_next(dns_rdataset_t *rdataset) {
369 count = rdataset->privateuint4;
371 return (ISC_R_NOMORE);
373 rdataset->privateuint4 = count;
374 raw = rdataset->private5;
375 length = raw[0] * 256 + raw[1];
376 #if DNS_RDATASET_FIXED
381 rdataset->private5 = raw;
383 return (ISC_R_SUCCESS);
387 rdataset_current(dns_rdataset_t *rdataset, dns_rdata_t *rdata) {
388 unsigned char *raw = rdataset->private5;
391 unsigned int flags = 0;
393 REQUIRE(raw != NULL);
395 length = raw[0] * 256 + raw[1];
396 #if DNS_RDATASET_FIXED
401 if (rdataset->type == dns_rdatatype_rrsig) {
402 if (*raw & DNS_RDATASLAB_OFFLINE)
403 flags |= DNS_RDATA_OFFLINE;
409 dns_rdata_fromregion(rdata, rdataset->rdclass, rdataset->type, &r);
410 rdata->flags |= flags;
414 rdataset_clone(dns_rdataset_t *source, dns_rdataset_t *target) {
418 * Reset iterator state.
420 target->privateuint4 = 0;
421 target->private5 = NULL;
425 rdataset_count(dns_rdataset_t *rdataset) {
426 unsigned char *raw = rdataset->private3;
429 count = raw[0] * 256 + raw[1];
434 static dns_rdatasetmethods_t rdataset_methods = {
435 rdataset_disassociate,
453 dns_rdataslab_tordataset(unsigned char *slab, unsigned int reservelen,
454 dns_rdataclass_t rdclass, dns_rdatatype_t rdtype,
455 dns_rdatatype_t covers, dns_ttl_t ttl,
456 dns_rdataset_t *rdataset)
458 REQUIRE(slab != NULL);
459 REQUIRE(!dns_rdataset_isassociated(rdataset));
461 rdataset->methods = &rdataset_methods;
462 rdataset->rdclass = rdclass;
463 rdataset->type = rdtype;
464 rdataset->covers = covers;
467 rdataset->private1 = NULL;
468 rdataset->private2 = NULL;
469 rdataset->private3 = slab + reservelen;
472 * Reset iterator state.
474 rdataset->privateuint4 = 0;
475 rdataset->private5 = NULL;
479 dns_rdataslab_size(unsigned char *slab, unsigned int reservelen) {
480 unsigned int count, length;
481 unsigned char *current;
483 REQUIRE(slab != NULL);
485 current = slab + reservelen;
486 count = *current++ * 256;
488 #if DNS_RDATASET_FIXED
489 current += (4 * count);
493 length = *current++ * 256;
494 length += *current++;
495 #if DNS_RDATASET_FIXED
496 current += length + 2;
502 return ((unsigned int)(current - slab));
506 * Make the dns_rdata_t 'rdata' refer to the slab item
507 * beginning at '*current', which is part of a slab of type
508 * 'type' and class 'rdclass', and advance '*current' to
509 * point to the next item in the slab.
512 rdata_from_slab(unsigned char **current,
513 dns_rdataclass_t rdclass, dns_rdatatype_t type,
516 unsigned char *tcurrent = *current;
519 isc_boolean_t offline = ISC_FALSE;
521 length = *tcurrent++ * 256;
522 length += *tcurrent++;
524 if (type == dns_rdatatype_rrsig) {
525 if ((*tcurrent & DNS_RDATASLAB_OFFLINE) != 0)
530 region.length = length;
531 #if DNS_RDATASET_FIXED
534 region.base = tcurrent;
535 tcurrent += region.length;
536 dns_rdata_fromregion(rdata, rdclass, type, ®ion);
538 rdata->flags |= DNS_RDATA_OFFLINE;
543 * Return true iff 'slab' (slab data of type 'type' and class 'rdclass')
544 * contains an rdata identical to 'rdata'. This does case insensitive
545 * comparisons per DNSSEC.
547 static inline isc_boolean_t
548 rdata_in_slab(unsigned char *slab, unsigned int reservelen,
549 dns_rdataclass_t rdclass, dns_rdatatype_t type,
552 unsigned int count, i;
553 unsigned char *current;
554 dns_rdata_t trdata = DNS_RDATA_INIT;
557 current = slab + reservelen;
558 count = *current++ * 256;
561 #if DNS_RDATASET_FIXED
562 current += (4 * count);
565 for (i = 0; i < count; i++) {
566 rdata_from_slab(¤t, rdclass, type, &trdata);
568 n = dns_rdata_compare(&trdata, rdata);
571 if (n > 0) /* In DNSSEC order. */
573 dns_rdata_reset(&trdata);
579 dns_rdataslab_merge(unsigned char *oslab, unsigned char *nslab,
580 unsigned int reservelen, isc_mem_t *mctx,
581 dns_rdataclass_t rdclass, dns_rdatatype_t type,
582 unsigned int flags, unsigned char **tslabp)
584 unsigned char *ocurrent, *ostart, *ncurrent, *tstart, *tcurrent, *data;
585 unsigned int ocount, ncount, count, olength, tlength, tcount, length;
586 dns_rdata_t ordata = DNS_RDATA_INIT;
587 dns_rdata_t nrdata = DNS_RDATA_INIT;
588 isc_boolean_t added_something = ISC_FALSE;
589 unsigned int oadded = 0;
590 unsigned int nadded = 0;
591 unsigned int nncount = 0;
592 #if DNS_RDATASET_FIXED
593 unsigned int oncount;
594 unsigned int norder = 0;
595 unsigned int oorder = 0;
596 unsigned char *offsetbase;
597 unsigned int *offsettable;
601 * XXX Need parameter to allow "delete rdatasets in nslab" merge,
602 * or perhaps another merge routine for this purpose.
605 REQUIRE(tslabp != NULL && *tslabp == NULL);
606 REQUIRE(oslab != NULL && nslab != NULL);
608 ocurrent = oslab + reservelen;
609 ocount = *ocurrent++ * 256;
610 ocount += *ocurrent++;
611 #if DNS_RDATASET_FIXED
612 ocurrent += (4 * ocount);
615 ncurrent = nslab + reservelen;
616 ncount = *ncurrent++ * 256;
617 ncount += *ncurrent++;
618 #if DNS_RDATASET_FIXED
619 ncurrent += (4 * ncount);
621 INSIST(ocount > 0 && ncount > 0);
623 #if DNS_RDATASET_FIXED
628 * Yes, this is inefficient!
632 * Figure out the length of the old slab's data.
635 for (count = 0; count < ocount; count++) {
636 length = *ocurrent++ * 256;
637 length += *ocurrent++;
638 #if DNS_RDATASET_FIXED
639 olength += length + 8;
640 ocurrent += length + 2;
642 olength += length + 2;
648 * Start figuring out the target length and count.
650 tlength = reservelen + 2 + olength;
654 * Add in the length of rdata in the new slab that aren't in
658 dns_rdata_init(&nrdata);
659 rdata_from_slab(&ncurrent, rdclass, type, &nrdata);
660 if (!rdata_in_slab(oslab, reservelen, rdclass, type, &nrdata))
663 * This rdata isn't in the old slab.
665 #if DNS_RDATASET_FIXED
666 tlength += nrdata.length + 8;
668 tlength += nrdata.length + 2;
670 if (type == dns_rdatatype_rrsig)
674 added_something = ISC_TRUE;
677 } while (ncount > 0);
680 if (((flags & DNS_RDATASLAB_EXACT) != 0) &&
681 (tcount != ncount + ocount))
682 return (DNS_R_NOTEXACT);
684 if (!added_something && (flags & DNS_RDATASLAB_FORCE) == 0)
685 return (DNS_R_UNCHANGED);
688 * Ensure that singleton types are actually singletons.
690 if (tcount > 1 && dns_rdatatype_issingleton(type)) {
692 * We have a singleton type, but there's more than one
693 * RR in the rdataset.
695 return (DNS_R_SINGLETON);
699 return (ISC_R_NOSPACE);
702 * Copy the reserved area from the new slab.
704 tstart = isc_mem_get(mctx, tlength);
706 return (ISC_R_NOMEMORY);
707 memcpy(tstart, nslab, reservelen);
708 tcurrent = tstart + reservelen;
709 #if DNS_RDATASET_FIXED
710 offsetbase = tcurrent;
714 * Write the new count.
716 *tcurrent++ = (tcount & 0xff00) >> 8;
717 *tcurrent++ = (tcount & 0x00ff);
719 #if DNS_RDATASET_FIXED
723 tcurrent += (tcount * 4);
725 offsettable = isc_mem_get(mctx,
726 (ocount + oncount) * sizeof(unsigned int));
727 if (offsettable == NULL) {
728 isc_mem_put(mctx, tstart, tlength);
729 return (ISC_R_NOMEMORY);
731 memset(offsettable, 0, (ocount + oncount) * sizeof(unsigned int));
735 * Merge the two slabs.
739 #if DNS_RDATASET_FIXED
740 oorder = ocurrent[2] * 256 + ocurrent[3];
741 INSIST(oorder < ocount);
743 rdata_from_slab(&ocurrent, rdclass, type, &ordata);
745 ncurrent = nslab + reservelen + 2;
746 #if DNS_RDATASET_FIXED
747 ncurrent += (4 * oncount);
752 dns_rdata_reset(&nrdata);
753 #if DNS_RDATASET_FIXED
754 norder = ncurrent[2] * 256 + ncurrent[3];
756 INSIST(norder < oncount);
758 rdata_from_slab(&ncurrent, rdclass, type, &nrdata);
759 } while (rdata_in_slab(oslab, reservelen, rdclass,
763 while (oadded < ocount || nadded < ncount) {
764 isc_boolean_t fromold;
765 if (oadded == ocount)
767 else if (nadded == ncount)
770 fromold = ISC_TF(compare_rdata(&ordata, &nrdata) < 0);
772 #if DNS_RDATASET_FIXED
773 offsettable[oorder] = tcurrent - offsetbase;
775 length = ordata.length;
777 if (type == dns_rdatatype_rrsig) {
781 *tcurrent++ = (length & 0xff00) >> 8;
782 *tcurrent++ = (length & 0x00ff);
783 #if DNS_RDATASET_FIXED
784 tcurrent += 2; /* fill in later */
786 memcpy(tcurrent, data, length);
789 if (oadded < ocount) {
790 dns_rdata_reset(&ordata);
791 #if DNS_RDATASET_FIXED
792 oorder = ocurrent[2] * 256 + ocurrent[3];
793 INSIST(oorder < ocount);
795 rdata_from_slab(&ocurrent, rdclass, type,
799 #if DNS_RDATASET_FIXED
800 offsettable[ocount + norder] = tcurrent - offsetbase;
802 length = nrdata.length;
804 if (type == dns_rdatatype_rrsig) {
808 *tcurrent++ = (length & 0xff00) >> 8;
809 *tcurrent++ = (length & 0x00ff);
810 #if DNS_RDATASET_FIXED
811 tcurrent += 2; /* fill in later */
813 memcpy(tcurrent, data, length);
816 if (nadded < ncount) {
818 dns_rdata_reset(&nrdata);
819 #if DNS_RDATASET_FIXED
820 norder = ncurrent[2] * 256 + ncurrent[3];
821 INSIST(norder < oncount);
823 rdata_from_slab(&ncurrent, rdclass,
825 } while (rdata_in_slab(oslab, reservelen,
832 #if DNS_RDATASET_FIXED
833 fillin_offsets(offsetbase, offsettable, ocount + oncount);
835 isc_mem_put(mctx, offsettable,
836 (ocount + oncount) * sizeof(unsigned int));
839 INSIST(tcurrent == tstart + tlength);
843 return (ISC_R_SUCCESS);
847 dns_rdataslab_subtract(unsigned char *mslab, unsigned char *sslab,
848 unsigned int reservelen, isc_mem_t *mctx,
849 dns_rdataclass_t rdclass, dns_rdatatype_t type,
850 unsigned int flags, unsigned char **tslabp)
852 unsigned char *mcurrent, *sstart, *scurrent, *tstart, *tcurrent;
853 unsigned int mcount, scount, rcount ,count, tlength, tcount, i;
854 dns_rdata_t srdata = DNS_RDATA_INIT;
855 dns_rdata_t mrdata = DNS_RDATA_INIT;
856 #if DNS_RDATASET_FIXED
857 unsigned char *offsetbase;
858 unsigned int *offsettable;
862 REQUIRE(tslabp != NULL && *tslabp == NULL);
863 REQUIRE(mslab != NULL && sslab != NULL);
865 mcurrent = mslab + reservelen;
866 mcount = *mcurrent++ * 256;
867 mcount += *mcurrent++;
868 scurrent = sslab + reservelen;
869 scount = *scurrent++ * 256;
870 scount += *scurrent++;
871 INSIST(mcount > 0 && scount > 0);
874 * Yes, this is inefficient!
878 * Start figuring out the target length and count.
880 tlength = reservelen + 2;
884 #if DNS_RDATASET_FIXED
885 mcurrent += 4 * mcount;
886 scurrent += 4 * scount;
891 * Add in the length of rdata in the mslab that aren't in
894 for (i = 0; i < mcount; i++) {
895 unsigned char *mrdatabegin = mcurrent;
896 rdata_from_slab(&mcurrent, rdclass, type, &mrdata);
898 for (count = 0; count < scount; count++) {
899 dns_rdata_reset(&srdata);
900 rdata_from_slab(&scurrent, rdclass, type, &srdata);
901 if (dns_rdata_compare(&mrdata, &srdata) == 0)
904 if (count == scount) {
906 * This rdata isn't in the sslab, and thus isn't
909 tlength += mcurrent - mrdatabegin;
913 dns_rdata_reset(&mrdata);
916 #if DNS_RDATASET_FIXED
917 tlength += (4 * tcount);
921 * Check that all the records originally existed. The numeric
922 * check only works as rdataslabs do not contain duplicates.
924 if (((flags & DNS_RDATASLAB_EXACT) != 0) && (rcount != scount))
925 return (DNS_R_NOTEXACT);
928 * Don't continue if the new rdataslab would be empty.
931 return (DNS_R_NXRRSET);
934 * If nothing is going to change, we can stop.
937 return (DNS_R_UNCHANGED);
940 * Copy the reserved area from the mslab.
942 tstart = isc_mem_get(mctx, tlength);
944 return (ISC_R_NOMEMORY);
945 memcpy(tstart, mslab, reservelen);
946 tcurrent = tstart + reservelen;
947 #if DNS_RDATASET_FIXED
948 offsetbase = tcurrent;
950 offsettable = isc_mem_get(mctx, mcount * sizeof(unsigned int));
951 if (offsettable == NULL) {
952 isc_mem_put(mctx, tstart, tlength);
953 return (ISC_R_NOMEMORY);
955 memset(offsettable, 0, mcount * sizeof(unsigned int));
959 * Write the new count.
961 *tcurrent++ = (tcount & 0xff00) >> 8;
962 *tcurrent++ = (tcount & 0x00ff);
964 #if DNS_RDATASET_FIXED
965 tcurrent += (4 * tcount);
969 * Copy the parts of mslab not in sslab.
971 mcurrent = mslab + reservelen;
972 mcount = *mcurrent++ * 256;
973 mcount += *mcurrent++;
974 #if DNS_RDATASET_FIXED
975 mcurrent += (4 * mcount);
977 for (i = 0; i < mcount; i++) {
978 unsigned char *mrdatabegin = mcurrent;
979 #if DNS_RDATASET_FIXED
980 order = mcurrent[2] * 256 + mcurrent[3];
981 INSIST(order < mcount);
983 rdata_from_slab(&mcurrent, rdclass, type, &mrdata);
985 for (count = 0; count < scount; count++) {
986 dns_rdata_reset(&srdata);
987 rdata_from_slab(&scurrent, rdclass, type, &srdata);
988 if (dns_rdata_compare(&mrdata, &srdata) == 0)
991 if (count == scount) {
993 * This rdata isn't in the sslab, and thus should be
994 * copied to the tslab.
996 unsigned int length = mcurrent - mrdatabegin;
997 #if DNS_RDATASET_FIXED
998 offsettable[order] = tcurrent - offsetbase;
1000 memcpy(tcurrent, mrdatabegin, length);
1003 dns_rdata_reset(&mrdata);
1006 #if DNS_RDATASET_FIXED
1007 fillin_offsets(offsetbase, offsettable, mcount);
1009 isc_mem_put(mctx, offsettable, mcount * sizeof(unsigned int));
1012 INSIST(tcurrent == tstart + tlength);
1016 return (ISC_R_SUCCESS);
1020 dns_rdataslab_equal(unsigned char *slab1, unsigned char *slab2,
1021 unsigned int reservelen)
1023 unsigned char *current1, *current2;
1024 unsigned int count1, count2;
1025 unsigned int length1, length2;
1027 current1 = slab1 + reservelen;
1028 count1 = *current1++ * 256;
1029 count1 += *current1++;
1031 current2 = slab2 + reservelen;
1032 count2 = *current2++ * 256;
1033 count2 += *current2++;
1035 if (count1 != count2)
1038 #if DNS_RDATASET_FIXED
1039 current1 += (4 * count1);
1040 current2 += (4 * count2);
1043 while (count1 > 0) {
1044 length1 = *current1++ * 256;
1045 length1 += *current1++;
1047 length2 = *current2++ * 256;
1048 length2 += *current2++;
1050 #if DNS_RDATASET_FIXED
1055 if (length1 != length2 ||
1056 memcmp(current1, current2, length1) != 0)
1059 current1 += length1;
1060 current2 += length1;
1068 dns_rdataslab_equalx(unsigned char *slab1, unsigned char *slab2,
1069 unsigned int reservelen, dns_rdataclass_t rdclass,
1070 dns_rdatatype_t type)
1072 unsigned char *current1, *current2;
1073 unsigned int count1, count2;
1074 dns_rdata_t rdata1 = DNS_RDATA_INIT;
1075 dns_rdata_t rdata2 = DNS_RDATA_INIT;
1077 current1 = slab1 + reservelen;
1078 count1 = *current1++ * 256;
1079 count1 += *current1++;
1081 current2 = slab2 + reservelen;
1082 count2 = *current2++ * 256;
1083 count2 += *current2++;
1085 if (count1 != count2)
1088 #if DNS_RDATASET_FIXED
1089 current1 += (4 * count1);
1090 current2 += (4 * count2);
1093 while (count1-- > 0) {
1094 rdata_from_slab(¤t1, rdclass, type, &rdata1);
1095 rdata_from_slab(¤t2, rdclass, type, &rdata2);
1096 if (dns_rdata_compare(&rdata1, &rdata2) != 0)
1098 dns_rdata_reset(&rdata1);
1099 dns_rdata_reset(&rdata2);