2 * Copyright (C) 2004-2012 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.
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 * meta data (1 byte for RRSIG's)
57 * data (data length bytes)
59 * Offsets are from the end of the header.
61 * Load order traversal is performed by walking the offset table to find
62 * the start of the record (DNS_RDATASET_FIXED = 1).
64 * DNSSEC order traversal is performed by walking the data records.
66 * The order is stored with record to allow for efficient reconstruction
67 * of the offset table following a merge or subtraction.
69 * The iterator methods here currently only support DNSSEC order iteration.
71 * The iterator methods in rbtdb support both load order and DNSSEC order
75 * rbtdb.c directly interacts with the slab's raw structures. If the
76 * structure changes then rbtdb.c also needs to be updated to reflect
77 * the changes. See the areas tagged with "RDATASLAB".
85 /*% Note: the "const void *" are just to make qsort happy. */
87 compare_rdata(const void *p1, const void *p2) {
88 const struct xrdata *x1 = p1;
89 const struct xrdata *x2 = p2;
90 return (dns_rdata_compare(&x1->rdata, &x2->rdata));
93 #if DNS_RDATASET_FIXED
95 fillin_offsets(unsigned char *offsetbase, unsigned int *offsettable,
101 for (i = 0, j = 0; i < length; i++) {
103 if (offsettable[i] == 0)
107 * Fill in offset table.
109 raw = &offsetbase[j*4 + 2];
110 *raw++ = (offsettable[i] & 0xff000000) >> 24;
111 *raw++ = (offsettable[i] & 0xff0000) >> 16;
112 *raw++ = (offsettable[i] & 0xff00) >> 8;
113 *raw = offsettable[i] & 0xff;
116 * Fill in table index.
118 raw = offsetbase + offsettable[i] + 2;
119 *raw++ = (j & 0xff00) >> 8;
126 dns_rdataslab_fromrdataset(dns_rdataset_t *rdataset, isc_mem_t *mctx,
127 isc_region_t *region, unsigned int reservelen)
130 * Use &removed as a sentinal pointer for duplicate
131 * rdata as rdata.data == NULL is valid.
133 static unsigned char removed;
135 unsigned char *rawbuf;
136 #if DNS_RDATASET_FIXED
137 unsigned char *offsetbase;
144 #if DNS_RDATASET_FIXED
145 unsigned int *offsettable;
149 buflen = reservelen + 2;
151 nalloc = dns_rdataset_count(rdataset);
153 if (nitems == 0 && rdataset->type != 0)
154 return (ISC_R_FAILURE);
157 return (ISC_R_NOSPACE);
161 x = isc_mem_get(mctx, nalloc * sizeof(struct xrdata));
163 return (ISC_R_NOMEMORY);
168 * Save all of the rdata members into an array.
170 result = dns_rdataset_first(rdataset);
171 if (result != ISC_R_SUCCESS && result != ISC_R_NOMORE)
173 for (i = 0; i < nalloc && result == ISC_R_SUCCESS; i++) {
174 INSIST(result == ISC_R_SUCCESS);
175 dns_rdata_init(&x[i].rdata);
176 dns_rdataset_current(rdataset, &x[i].rdata);
177 INSIST(x[i].rdata.data != &removed);
178 #if DNS_RDATASET_FIXED
181 result = dns_rdataset_next(rdataset);
183 if (result != ISC_R_NOMORE)
187 * Somehow we iterated over fewer rdatas than
188 * dns_rdataset_count() said there were!
190 result = ISC_R_FAILURE;
195 * Put into DNSSEC order.
197 qsort(x, nalloc, sizeof(struct xrdata), compare_rdata);
200 * Remove duplicates and compute the total storage required.
202 * If an rdata is not a duplicate, accumulate the storage size
203 * required for the rdata. We do not store the class, type, etc,
204 * just the rdata, so our overhead is 2 bytes for the number of
205 * records, and 8 for each rdata, (length(2), offset(4) and order(2))
206 * and then the rdata itself.
208 for (i = 1; i < nalloc; i++) {
209 if (compare_rdata(&x[i-1].rdata, &x[i].rdata) == 0) {
210 x[i-1].rdata.data = &removed;
211 #if DNS_RDATASET_FIXED
213 * Preserve the least order so A, B, A -> A, B
214 * after duplicate removal.
216 if (x[i-1].order < x[i].order)
217 x[i].order = x[i-1].order;
221 #if DNS_RDATASET_FIXED
222 buflen += (8 + x[i-1].rdata.length);
224 buflen += (2 + x[i-1].rdata.length);
227 * Provide space to store the per RR meta data.
229 if (rdataset->type == dns_rdatatype_rrsig)
234 * Don't forget the last item!
237 #if DNS_RDATASET_FIXED
238 buflen += (8 + x[i-1].rdata.length);
240 buflen += (2 + x[i-1].rdata.length);
245 * Provide space to store the per RR meta data.
247 if (rdataset->type == dns_rdatatype_rrsig)
251 * Ensure that singleton types are actually singletons.
253 if (nitems > 1 && dns_rdatatype_issingleton(rdataset->type)) {
255 * We have a singleton type, but there's more than one
256 * RR in the rdataset.
258 result = DNS_R_SINGLETON;
263 * Allocate the memory, set up a buffer, start copying in
266 rawbuf = isc_mem_get(mctx, buflen);
267 if (rawbuf == NULL) {
268 result = ISC_R_NOMEMORY;
272 #if DNS_RDATASET_FIXED
273 /* Allocate temporary offset table. */
274 offsettable = isc_mem_get(mctx, nalloc * sizeof(unsigned int));
275 if (offsettable == NULL) {
276 isc_mem_put(mctx, rawbuf, buflen);
277 result = ISC_R_NOMEMORY;
280 memset(offsettable, 0, nalloc * sizeof(unsigned int));
283 region->base = rawbuf;
284 region->length = buflen;
286 rawbuf += reservelen;
287 #if DNS_RDATASET_FIXED
291 *rawbuf++ = (nitems & 0xff00) >> 8;
292 *rawbuf++ = (nitems & 0x00ff);
294 #if DNS_RDATASET_FIXED
295 /* Skip load order table. Filled in later. */
296 rawbuf += nitems * 4;
299 for (i = 0; i < nalloc; i++) {
300 if (x[i].rdata.data == &removed)
302 #if DNS_RDATASET_FIXED
303 offsettable[x[i].order] = rawbuf - offsetbase;
305 length = x[i].rdata.length;
306 if (rdataset->type == dns_rdatatype_rrsig)
308 INSIST(length <= 0xffff);
309 *rawbuf++ = (length & 0xff00) >> 8;
310 *rawbuf++ = (length & 0x00ff);
311 #if DNS_RDATASET_FIXED
312 rawbuf += 2; /* filled in later */
315 * Store the per RR meta data.
317 if (rdataset->type == dns_rdatatype_rrsig) {
318 *rawbuf++ |= (x[i].rdata.flags & DNS_RDATA_OFFLINE) ?
319 DNS_RDATASLAB_OFFLINE : 0;
321 memcpy(rawbuf, x[i].rdata.data, x[i].rdata.length);
322 rawbuf += x[i].rdata.length;
325 #if DNS_RDATASET_FIXED
326 fillin_offsets(offsetbase, offsettable, nalloc);
327 isc_mem_put(mctx, offsettable, nalloc * sizeof(unsigned int));
330 result = ISC_R_SUCCESS;
334 isc_mem_put(mctx, x, nalloc * sizeof(struct xrdata));
339 rdataset_disassociate(dns_rdataset_t *rdataset) {
344 rdataset_first(dns_rdataset_t *rdataset) {
345 unsigned char *raw = rdataset->private3;
348 count = raw[0] * 256 + raw[1];
350 rdataset->private5 = NULL;
351 return (ISC_R_NOMORE);
353 #if DNS_RDATASET_FIXED
354 raw += 2 + (4 * count);
359 * The privateuint4 field is the number of rdata beyond the cursor
360 * position, so we decrement the total count by one before storing
364 rdataset->privateuint4 = count;
365 rdataset->private5 = raw;
367 return (ISC_R_SUCCESS);
371 rdataset_next(dns_rdataset_t *rdataset) {
376 count = rdataset->privateuint4;
378 return (ISC_R_NOMORE);
380 rdataset->privateuint4 = count;
381 raw = rdataset->private5;
382 length = raw[0] * 256 + raw[1];
383 #if DNS_RDATASET_FIXED
388 rdataset->private5 = raw;
390 return (ISC_R_SUCCESS);
394 rdataset_current(dns_rdataset_t *rdataset, dns_rdata_t *rdata) {
395 unsigned char *raw = rdataset->private5;
398 unsigned int flags = 0;
400 REQUIRE(raw != NULL);
402 length = raw[0] * 256 + raw[1];
403 #if DNS_RDATASET_FIXED
408 if (rdataset->type == dns_rdatatype_rrsig) {
409 if (*raw & DNS_RDATASLAB_OFFLINE)
410 flags |= DNS_RDATA_OFFLINE;
416 dns_rdata_fromregion(rdata, rdataset->rdclass, rdataset->type, &r);
417 rdata->flags |= flags;
421 rdataset_clone(dns_rdataset_t *source, dns_rdataset_t *target) {
425 * Reset iterator state.
427 target->privateuint4 = 0;
428 target->private5 = NULL;
432 rdataset_count(dns_rdataset_t *rdataset) {
433 unsigned char *raw = rdataset->private3;
436 count = raw[0] * 256 + raw[1];
441 static dns_rdatasetmethods_t rdataset_methods = {
442 rdataset_disassociate,
460 dns_rdataslab_tordataset(unsigned char *slab, unsigned int reservelen,
461 dns_rdataclass_t rdclass, dns_rdatatype_t rdtype,
462 dns_rdatatype_t covers, dns_ttl_t ttl,
463 dns_rdataset_t *rdataset)
465 REQUIRE(slab != NULL);
466 REQUIRE(!dns_rdataset_isassociated(rdataset));
468 rdataset->methods = &rdataset_methods;
469 rdataset->rdclass = rdclass;
470 rdataset->type = rdtype;
471 rdataset->covers = covers;
474 rdataset->private1 = NULL;
475 rdataset->private2 = NULL;
476 rdataset->private3 = slab + reservelen;
479 * Reset iterator state.
481 rdataset->privateuint4 = 0;
482 rdataset->private5 = NULL;
486 dns_rdataslab_size(unsigned char *slab, unsigned int reservelen) {
487 unsigned int count, length;
488 unsigned char *current;
490 REQUIRE(slab != NULL);
492 current = slab + reservelen;
493 count = *current++ * 256;
495 #if DNS_RDATASET_FIXED
496 current += (4 * count);
500 length = *current++ * 256;
501 length += *current++;
502 #if DNS_RDATASET_FIXED
503 current += length + 2;
509 return ((unsigned int)(current - slab));
513 * Make the dns_rdata_t 'rdata' refer to the slab item
514 * beginning at '*current', which is part of a slab of type
515 * 'type' and class 'rdclass', and advance '*current' to
516 * point to the next item in the slab.
519 rdata_from_slab(unsigned char **current,
520 dns_rdataclass_t rdclass, dns_rdatatype_t type,
523 unsigned char *tcurrent = *current;
526 isc_boolean_t offline = ISC_FALSE;
528 length = *tcurrent++ * 256;
529 length += *tcurrent++;
531 if (type == dns_rdatatype_rrsig) {
532 if ((*tcurrent & DNS_RDATASLAB_OFFLINE) != 0)
537 region.length = length;
538 #if DNS_RDATASET_FIXED
541 region.base = tcurrent;
542 tcurrent += region.length;
543 dns_rdata_fromregion(rdata, rdclass, type, ®ion);
545 rdata->flags |= DNS_RDATA_OFFLINE;
550 * Return true iff 'slab' (slab data of type 'type' and class 'rdclass')
551 * contains an rdata identical to 'rdata'. This does case insensitive
552 * comparisons per DNSSEC.
554 static inline isc_boolean_t
555 rdata_in_slab(unsigned char *slab, unsigned int reservelen,
556 dns_rdataclass_t rdclass, dns_rdatatype_t type,
559 unsigned int count, i;
560 unsigned char *current;
561 dns_rdata_t trdata = DNS_RDATA_INIT;
564 current = slab + reservelen;
565 count = *current++ * 256;
568 #if DNS_RDATASET_FIXED
569 current += (4 * count);
572 for (i = 0; i < count; i++) {
573 rdata_from_slab(¤t, rdclass, type, &trdata);
575 n = dns_rdata_compare(&trdata, rdata);
578 if (n > 0) /* In DNSSEC order. */
580 dns_rdata_reset(&trdata);
586 dns_rdataslab_merge(unsigned char *oslab, unsigned char *nslab,
587 unsigned int reservelen, isc_mem_t *mctx,
588 dns_rdataclass_t rdclass, dns_rdatatype_t type,
589 unsigned int flags, unsigned char **tslabp)
591 unsigned char *ocurrent, *ostart, *ncurrent, *tstart, *tcurrent, *data;
592 unsigned int ocount, ncount, count, olength, tlength, tcount, length;
593 dns_rdata_t ordata = DNS_RDATA_INIT;
594 dns_rdata_t nrdata = DNS_RDATA_INIT;
595 isc_boolean_t added_something = ISC_FALSE;
596 unsigned int oadded = 0;
597 unsigned int nadded = 0;
598 unsigned int nncount = 0;
599 #if DNS_RDATASET_FIXED
600 unsigned int oncount;
601 unsigned int norder = 0;
602 unsigned int oorder = 0;
603 unsigned char *offsetbase;
604 unsigned int *offsettable;
608 * XXX Need parameter to allow "delete rdatasets in nslab" merge,
609 * or perhaps another merge routine for this purpose.
612 REQUIRE(tslabp != NULL && *tslabp == NULL);
613 REQUIRE(oslab != NULL && nslab != NULL);
615 ocurrent = oslab + reservelen;
616 ocount = *ocurrent++ * 256;
617 ocount += *ocurrent++;
618 #if DNS_RDATASET_FIXED
619 ocurrent += (4 * ocount);
622 ncurrent = nslab + reservelen;
623 ncount = *ncurrent++ * 256;
624 ncount += *ncurrent++;
625 #if DNS_RDATASET_FIXED
626 ncurrent += (4 * ncount);
628 INSIST(ocount > 0 && ncount > 0);
630 #if DNS_RDATASET_FIXED
635 * Yes, this is inefficient!
639 * Figure out the length of the old slab's data.
642 for (count = 0; count < ocount; count++) {
643 length = *ocurrent++ * 256;
644 length += *ocurrent++;
645 #if DNS_RDATASET_FIXED
646 olength += length + 8;
647 ocurrent += length + 2;
649 olength += length + 2;
655 * Start figuring out the target length and count.
657 tlength = reservelen + 2 + olength;
661 * Add in the length of rdata in the new slab that aren't in
665 dns_rdata_init(&nrdata);
666 rdata_from_slab(&ncurrent, rdclass, type, &nrdata);
667 if (!rdata_in_slab(oslab, reservelen, rdclass, type, &nrdata))
670 * This rdata isn't in the old slab.
672 #if DNS_RDATASET_FIXED
673 tlength += nrdata.length + 8;
675 tlength += nrdata.length + 2;
677 if (type == dns_rdatatype_rrsig)
681 added_something = ISC_TRUE;
684 } while (ncount > 0);
687 if (((flags & DNS_RDATASLAB_EXACT) != 0) &&
688 (tcount != ncount + ocount))
689 return (DNS_R_NOTEXACT);
691 if (!added_something && (flags & DNS_RDATASLAB_FORCE) == 0)
692 return (DNS_R_UNCHANGED);
695 * Ensure that singleton types are actually singletons.
697 if (tcount > 1 && dns_rdatatype_issingleton(type)) {
699 * We have a singleton type, but there's more than one
700 * RR in the rdataset.
702 return (DNS_R_SINGLETON);
706 return (ISC_R_NOSPACE);
709 * Copy the reserved area from the new slab.
711 tstart = isc_mem_get(mctx, tlength);
713 return (ISC_R_NOMEMORY);
714 memcpy(tstart, nslab, reservelen);
715 tcurrent = tstart + reservelen;
716 #if DNS_RDATASET_FIXED
717 offsetbase = tcurrent;
721 * Write the new count.
723 *tcurrent++ = (tcount & 0xff00) >> 8;
724 *tcurrent++ = (tcount & 0x00ff);
726 #if DNS_RDATASET_FIXED
730 tcurrent += (tcount * 4);
732 offsettable = isc_mem_get(mctx,
733 (ocount + oncount) * sizeof(unsigned int));
734 if (offsettable == NULL) {
735 isc_mem_put(mctx, tstart, tlength);
736 return (ISC_R_NOMEMORY);
738 memset(offsettable, 0, (ocount + oncount) * sizeof(unsigned int));
742 * Merge the two slabs.
746 #if DNS_RDATASET_FIXED
747 oorder = ocurrent[2] * 256 + ocurrent[3];
748 INSIST(oorder < ocount);
750 rdata_from_slab(&ocurrent, rdclass, type, &ordata);
752 ncurrent = nslab + reservelen + 2;
753 #if DNS_RDATASET_FIXED
754 ncurrent += (4 * oncount);
759 dns_rdata_reset(&nrdata);
760 #if DNS_RDATASET_FIXED
761 norder = ncurrent[2] * 256 + ncurrent[3];
763 INSIST(norder < oncount);
765 rdata_from_slab(&ncurrent, rdclass, type, &nrdata);
766 } while (rdata_in_slab(oslab, reservelen, rdclass,
770 while (oadded < ocount || nadded < ncount) {
771 isc_boolean_t fromold;
772 if (oadded == ocount)
774 else if (nadded == ncount)
777 fromold = ISC_TF(compare_rdata(&ordata, &nrdata) < 0);
779 #if DNS_RDATASET_FIXED
780 offsettable[oorder] = tcurrent - offsetbase;
782 length = ordata.length;
784 if (type == dns_rdatatype_rrsig) {
788 *tcurrent++ = (length & 0xff00) >> 8;
789 *tcurrent++ = (length & 0x00ff);
790 #if DNS_RDATASET_FIXED
791 tcurrent += 2; /* fill in later */
793 memcpy(tcurrent, data, length);
796 if (oadded < ocount) {
797 dns_rdata_reset(&ordata);
798 #if DNS_RDATASET_FIXED
799 oorder = ocurrent[2] * 256 + ocurrent[3];
800 INSIST(oorder < ocount);
802 rdata_from_slab(&ocurrent, rdclass, type,
806 #if DNS_RDATASET_FIXED
807 offsettable[ocount + norder] = tcurrent - offsetbase;
809 length = nrdata.length;
811 if (type == dns_rdatatype_rrsig) {
815 *tcurrent++ = (length & 0xff00) >> 8;
816 *tcurrent++ = (length & 0x00ff);
817 #if DNS_RDATASET_FIXED
818 tcurrent += 2; /* fill in later */
820 memcpy(tcurrent, data, length);
823 if (nadded < ncount) {
825 dns_rdata_reset(&nrdata);
826 #if DNS_RDATASET_FIXED
827 norder = ncurrent[2] * 256 + ncurrent[3];
828 INSIST(norder < oncount);
830 rdata_from_slab(&ncurrent, rdclass,
832 } while (rdata_in_slab(oslab, reservelen,
839 #if DNS_RDATASET_FIXED
840 fillin_offsets(offsetbase, offsettable, ocount + oncount);
842 isc_mem_put(mctx, offsettable,
843 (ocount + oncount) * sizeof(unsigned int));
846 INSIST(tcurrent == tstart + tlength);
850 return (ISC_R_SUCCESS);
854 dns_rdataslab_subtract(unsigned char *mslab, unsigned char *sslab,
855 unsigned int reservelen, isc_mem_t *mctx,
856 dns_rdataclass_t rdclass, dns_rdatatype_t type,
857 unsigned int flags, unsigned char **tslabp)
859 unsigned char *mcurrent, *sstart, *scurrent, *tstart, *tcurrent;
860 unsigned int mcount, scount, rcount ,count, tlength, tcount, i;
861 dns_rdata_t srdata = DNS_RDATA_INIT;
862 dns_rdata_t mrdata = DNS_RDATA_INIT;
863 #if DNS_RDATASET_FIXED
864 unsigned char *offsetbase;
865 unsigned int *offsettable;
869 REQUIRE(tslabp != NULL && *tslabp == NULL);
870 REQUIRE(mslab != NULL && sslab != NULL);
872 mcurrent = mslab + reservelen;
873 mcount = *mcurrent++ * 256;
874 mcount += *mcurrent++;
875 scurrent = sslab + reservelen;
876 scount = *scurrent++ * 256;
877 scount += *scurrent++;
878 INSIST(mcount > 0 && scount > 0);
881 * Yes, this is inefficient!
885 * Start figuring out the target length and count.
887 tlength = reservelen + 2;
891 #if DNS_RDATASET_FIXED
892 mcurrent += 4 * mcount;
893 scurrent += 4 * scount;
898 * Add in the length of rdata in the mslab that aren't in
901 for (i = 0; i < mcount; i++) {
902 unsigned char *mrdatabegin = mcurrent;
903 rdata_from_slab(&mcurrent, rdclass, type, &mrdata);
905 for (count = 0; count < scount; count++) {
906 dns_rdata_reset(&srdata);
907 rdata_from_slab(&scurrent, rdclass, type, &srdata);
908 if (dns_rdata_compare(&mrdata, &srdata) == 0)
911 if (count == scount) {
913 * This rdata isn't in the sslab, and thus isn't
916 tlength += mcurrent - mrdatabegin;
920 dns_rdata_reset(&mrdata);
923 #if DNS_RDATASET_FIXED
924 tlength += (4 * tcount);
928 * Check that all the records originally existed. The numeric
929 * check only works as rdataslabs do not contain duplicates.
931 if (((flags & DNS_RDATASLAB_EXACT) != 0) && (rcount != scount))
932 return (DNS_R_NOTEXACT);
935 * Don't continue if the new rdataslab would be empty.
938 return (DNS_R_NXRRSET);
941 * If nothing is going to change, we can stop.
944 return (DNS_R_UNCHANGED);
947 * Copy the reserved area from the mslab.
949 tstart = isc_mem_get(mctx, tlength);
951 return (ISC_R_NOMEMORY);
952 memcpy(tstart, mslab, reservelen);
953 tcurrent = tstart + reservelen;
954 #if DNS_RDATASET_FIXED
955 offsetbase = tcurrent;
957 offsettable = isc_mem_get(mctx, mcount * sizeof(unsigned int));
958 if (offsettable == NULL) {
959 isc_mem_put(mctx, tstart, tlength);
960 return (ISC_R_NOMEMORY);
962 memset(offsettable, 0, mcount * sizeof(unsigned int));
966 * Write the new count.
968 *tcurrent++ = (tcount & 0xff00) >> 8;
969 *tcurrent++ = (tcount & 0x00ff);
971 #if DNS_RDATASET_FIXED
972 tcurrent += (4 * tcount);
976 * Copy the parts of mslab not in sslab.
978 mcurrent = mslab + reservelen;
979 mcount = *mcurrent++ * 256;
980 mcount += *mcurrent++;
981 #if DNS_RDATASET_FIXED
982 mcurrent += (4 * mcount);
984 for (i = 0; i < mcount; i++) {
985 unsigned char *mrdatabegin = mcurrent;
986 #if DNS_RDATASET_FIXED
987 order = mcurrent[2] * 256 + mcurrent[3];
988 INSIST(order < mcount);
990 rdata_from_slab(&mcurrent, rdclass, type, &mrdata);
992 for (count = 0; count < scount; count++) {
993 dns_rdata_reset(&srdata);
994 rdata_from_slab(&scurrent, rdclass, type, &srdata);
995 if (dns_rdata_compare(&mrdata, &srdata) == 0)
998 if (count == scount) {
1000 * This rdata isn't in the sslab, and thus should be
1001 * copied to the tslab.
1003 unsigned int length = mcurrent - mrdatabegin;
1004 #if DNS_RDATASET_FIXED
1005 offsettable[order] = tcurrent - offsetbase;
1007 memcpy(tcurrent, mrdatabegin, length);
1010 dns_rdata_reset(&mrdata);
1013 #if DNS_RDATASET_FIXED
1014 fillin_offsets(offsetbase, offsettable, mcount);
1016 isc_mem_put(mctx, offsettable, mcount * sizeof(unsigned int));
1019 INSIST(tcurrent == tstart + tlength);
1023 return (ISC_R_SUCCESS);
1027 dns_rdataslab_equal(unsigned char *slab1, unsigned char *slab2,
1028 unsigned int reservelen)
1030 unsigned char *current1, *current2;
1031 unsigned int count1, count2;
1032 unsigned int length1, length2;
1034 current1 = slab1 + reservelen;
1035 count1 = *current1++ * 256;
1036 count1 += *current1++;
1038 current2 = slab2 + reservelen;
1039 count2 = *current2++ * 256;
1040 count2 += *current2++;
1042 if (count1 != count2)
1045 #if DNS_RDATASET_FIXED
1046 current1 += (4 * count1);
1047 current2 += (4 * count2);
1050 while (count1 > 0) {
1051 length1 = *current1++ * 256;
1052 length1 += *current1++;
1054 length2 = *current2++ * 256;
1055 length2 += *current2++;
1057 #if DNS_RDATASET_FIXED
1062 if (length1 != length2 ||
1063 memcmp(current1, current2, length1) != 0)
1066 current1 += length1;
1067 current2 += length1;
1075 dns_rdataslab_equalx(unsigned char *slab1, unsigned char *slab2,
1076 unsigned int reservelen, dns_rdataclass_t rdclass,
1077 dns_rdatatype_t type)
1079 unsigned char *current1, *current2;
1080 unsigned int count1, count2;
1081 dns_rdata_t rdata1 = DNS_RDATA_INIT;
1082 dns_rdata_t rdata2 = DNS_RDATA_INIT;
1084 current1 = slab1 + reservelen;
1085 count1 = *current1++ * 256;
1086 count1 += *current1++;
1088 current2 = slab2 + reservelen;
1089 count2 = *current2++ * 256;
1090 count2 += *current2++;
1092 if (count1 != count2)
1095 #if DNS_RDATASET_FIXED
1096 current1 += (4 * count1);
1097 current2 += (4 * count2);
1100 while (count1-- > 0) {
1101 rdata_from_slab(¤t1, rdclass, type, &rdata1);
1102 rdata_from_slab(¤t2, rdclass, type, &rdata2);
1103 if (dns_rdata_compare(&rdata1, &rdata2) != 0)
1105 dns_rdata_reset(&rdata1);
1106 dns_rdata_reset(&rdata2);