2 * Copyright (C) 2004-2010 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 1.48.50.2.22.2 2010/02/25 10:57:12 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);
148 return (ISC_R_FAILURE);
151 return (ISC_R_NOSPACE);
153 x = isc_mem_get(mctx, nalloc * sizeof(struct xrdata));
155 return (ISC_R_NOMEMORY);
158 * Save all of the rdata members into an array.
160 result = dns_rdataset_first(rdataset);
161 if (result != ISC_R_SUCCESS)
163 for (i = 0; i < nalloc && result == ISC_R_SUCCESS; i++) {
164 INSIST(result == ISC_R_SUCCESS);
165 dns_rdata_init(&x[i].rdata);
166 dns_rdataset_current(rdataset, &x[i].rdata);
167 #if DNS_RDATASET_FIXED
170 result = dns_rdataset_next(rdataset);
172 if (result != ISC_R_NOMORE)
176 * Somehow we iterated over fewer rdatas than
177 * dns_rdataset_count() said there were!
179 result = ISC_R_FAILURE;
184 * Put into DNSSEC order.
186 qsort(x, nalloc, sizeof(struct xrdata), compare_rdata);
189 * Remove duplicates and compute the total storage required.
191 * If an rdata is not a duplicate, accumulate the storage size
192 * required for the rdata. We do not store the class, type, etc,
193 * just the rdata, so our overhead is 2 bytes for the number of
194 * records, and 8 for each rdata, (length(2), offset(4) and order(2))
195 * and then the rdata itself.
197 for (i = 1; i < nalloc; i++) {
198 if (compare_rdata(&x[i-1].rdata, &x[i].rdata) == 0) {
199 x[i-1].rdata.data = NULL;
200 x[i-1].rdata.length = 0;
201 #if DNS_RDATASET_FIXED
203 * Preserve the least order so A, B, A -> A, B
204 * after duplicate removal.
206 if (x[i-1].order < x[i].order)
207 x[i].order = x[i-1].order;
211 #if DNS_RDATASET_FIXED
212 buflen += (8 + x[i-1].rdata.length);
214 buflen += (2 + x[i-1].rdata.length);
217 * Provide space to store the per RR meta data.
219 if (rdataset->type == dns_rdatatype_rrsig)
224 * Don't forget the last item!
226 #if DNS_RDATASET_FIXED
227 buflen += (8 + x[i-1].rdata.length);
229 buflen += (2 + x[i-1].rdata.length);
232 * Provide space to store the per RR meta data.
234 if (rdataset->type == dns_rdatatype_rrsig)
238 * Ensure that singleton types are actually singletons.
240 if (nitems > 1 && dns_rdatatype_issingleton(rdataset->type)) {
242 * We have a singleton type, but there's more than one
243 * RR in the rdataset.
245 result = DNS_R_SINGLETON;
250 * Allocate the memory, set up a buffer, start copying in
253 rawbuf = isc_mem_get(mctx, buflen);
254 if (rawbuf == NULL) {
255 result = ISC_R_NOMEMORY;
259 #if DNS_RDATASET_FIXED
260 /* Allocate temporary offset table. */
261 offsettable = isc_mem_get(mctx, nalloc * sizeof(unsigned int));
262 if (offsettable == NULL) {
263 isc_mem_put(mctx, rawbuf, buflen);
264 result = ISC_R_NOMEMORY;
267 memset(offsettable, 0, nalloc * sizeof(unsigned int));
270 region->base = rawbuf;
271 region->length = buflen;
273 rawbuf += reservelen;
274 #if DNS_RDATASET_FIXED
278 *rawbuf++ = (nitems & 0xff00) >> 8;
279 *rawbuf++ = (nitems & 0x00ff);
281 #if DNS_RDATASET_FIXED
282 /* Skip load order table. Filled in later. */
283 rawbuf += nitems * 4;
286 for (i = 0; i < nalloc; i++) {
287 if (x[i].rdata.data == NULL)
289 #if DNS_RDATASET_FIXED
290 offsettable[x[i].order] = rawbuf - offsetbase;
292 length = x[i].rdata.length;
293 if (rdataset->type == dns_rdatatype_rrsig)
295 *rawbuf++ = (length & 0xff00) >> 8;
296 *rawbuf++ = (length & 0x00ff);
297 #if DNS_RDATASET_FIXED
298 rawbuf += 2; /* filled in later */
301 * Store the per RR meta data.
303 if (rdataset->type == dns_rdatatype_rrsig) {
304 *rawbuf++ |= (x[i].rdata.flags & DNS_RDATA_OFFLINE) ?
305 DNS_RDATASLAB_OFFLINE : 0;
307 memcpy(rawbuf, x[i].rdata.data, x[i].rdata.length);
308 rawbuf += x[i].rdata.length;
311 #if DNS_RDATASET_FIXED
312 fillin_offsets(offsetbase, offsettable, nalloc);
313 isc_mem_put(mctx, offsettable, nalloc * sizeof(unsigned int));
316 result = ISC_R_SUCCESS;
319 isc_mem_put(mctx, x, nalloc * sizeof(struct xrdata));
324 rdataset_disassociate(dns_rdataset_t *rdataset) {
329 rdataset_first(dns_rdataset_t *rdataset) {
330 unsigned char *raw = rdataset->private3;
333 count = raw[0] * 256 + raw[1];
335 rdataset->private5 = NULL;
336 return (ISC_R_NOMORE);
338 #if DNS_RDATASET_FIXED
339 raw += 2 + (4 * count);
344 * The privateuint4 field is the number of rdata beyond the cursor
345 * position, so we decrement the total count by one before storing
349 rdataset->privateuint4 = count;
350 rdataset->private5 = raw;
352 return (ISC_R_SUCCESS);
356 rdataset_next(dns_rdataset_t *rdataset) {
361 count = rdataset->privateuint4;
363 return (ISC_R_NOMORE);
365 rdataset->privateuint4 = count;
366 raw = rdataset->private5;
367 length = raw[0] * 256 + raw[1];
368 #if DNS_RDATASET_FIXED
373 rdataset->private5 = raw;
375 return (ISC_R_SUCCESS);
379 rdataset_current(dns_rdataset_t *rdataset, dns_rdata_t *rdata) {
380 unsigned char *raw = rdataset->private5;
383 unsigned int flags = 0;
385 REQUIRE(raw != NULL);
387 length = raw[0] * 256 + raw[1];
388 #if DNS_RDATASET_FIXED
393 if (rdataset->type == dns_rdatatype_rrsig) {
394 if (*raw & DNS_RDATASLAB_OFFLINE)
395 flags |= DNS_RDATA_OFFLINE;
401 dns_rdata_fromregion(rdata, rdataset->rdclass, rdataset->type, &r);
402 rdata->flags |= flags;
406 rdataset_clone(dns_rdataset_t *source, dns_rdataset_t *target) {
410 * Reset iterator state.
412 target->privateuint4 = 0;
413 target->private5 = NULL;
417 rdataset_count(dns_rdataset_t *rdataset) {
418 unsigned char *raw = rdataset->private3;
421 count = raw[0] * 256 + raw[1];
426 static dns_rdatasetmethods_t rdataset_methods = {
427 rdataset_disassociate,
445 dns_rdataslab_tordataset(unsigned char *slab, unsigned int reservelen,
446 dns_rdataclass_t rdclass, dns_rdatatype_t rdtype,
447 dns_rdatatype_t covers, dns_ttl_t ttl,
448 dns_rdataset_t *rdataset)
450 REQUIRE(slab != NULL);
451 REQUIRE(!dns_rdataset_isassociated(rdataset));
453 rdataset->methods = &rdataset_methods;
454 rdataset->rdclass = rdclass;
455 rdataset->type = rdtype;
456 rdataset->covers = covers;
459 rdataset->private1 = NULL;
460 rdataset->private2 = NULL;
461 rdataset->private3 = slab + reservelen;
464 * Reset iterator state.
466 rdataset->privateuint4 = 0;
467 rdataset->private5 = NULL;
471 dns_rdataslab_size(unsigned char *slab, unsigned int reservelen) {
472 unsigned int count, length;
473 unsigned char *current;
475 REQUIRE(slab != NULL);
477 current = slab + reservelen;
478 count = *current++ * 256;
480 #if DNS_RDATASET_FIXED
481 current += (4 * count);
485 length = *current++ * 256;
486 length += *current++;
487 #if DNS_RDATASET_FIXED
488 current += length + 2;
494 return ((unsigned int)(current - slab));
498 * Make the dns_rdata_t 'rdata' refer to the slab item
499 * beginning at '*current', which is part of a slab of type
500 * 'type' and class 'rdclass', and advance '*current' to
501 * point to the next item in the slab.
504 rdata_from_slab(unsigned char **current,
505 dns_rdataclass_t rdclass, dns_rdatatype_t type,
508 unsigned char *tcurrent = *current;
511 isc_boolean_t offline = ISC_FALSE;
513 length = *tcurrent++ * 256;
514 length += *tcurrent++;
516 if (type == dns_rdatatype_rrsig) {
517 if ((*tcurrent & DNS_RDATASLAB_OFFLINE) != 0)
522 region.length = length;
523 #if DNS_RDATASET_FIXED
526 region.base = tcurrent;
527 tcurrent += region.length;
528 dns_rdata_fromregion(rdata, rdclass, type, ®ion);
530 rdata->flags |= DNS_RDATA_OFFLINE;
535 * Return true iff 'slab' (slab data of type 'type' and class 'rdclass')
536 * contains an rdata identical to 'rdata'. This does case insensitive
537 * comparisons per DNSSEC.
539 static inline isc_boolean_t
540 rdata_in_slab(unsigned char *slab, unsigned int reservelen,
541 dns_rdataclass_t rdclass, dns_rdatatype_t type,
544 unsigned int count, i;
545 unsigned char *current;
546 dns_rdata_t trdata = DNS_RDATA_INIT;
549 current = slab + reservelen;
550 count = *current++ * 256;
553 #if DNS_RDATASET_FIXED
554 current += (4 * count);
557 for (i = 0; i < count; i++) {
558 rdata_from_slab(¤t, rdclass, type, &trdata);
560 n = dns_rdata_compare(&trdata, rdata);
563 if (n > 0) /* In DNSSEC order. */
565 dns_rdata_reset(&trdata);
571 dns_rdataslab_merge(unsigned char *oslab, unsigned char *nslab,
572 unsigned int reservelen, isc_mem_t *mctx,
573 dns_rdataclass_t rdclass, dns_rdatatype_t type,
574 unsigned int flags, unsigned char **tslabp)
576 unsigned char *ocurrent, *ostart, *ncurrent, *tstart, *tcurrent, *data;
577 unsigned int ocount, ncount, count, olength, tlength, tcount, length;
578 dns_rdata_t ordata = DNS_RDATA_INIT;
579 dns_rdata_t nrdata = DNS_RDATA_INIT;
580 isc_boolean_t added_something = ISC_FALSE;
581 unsigned int oadded = 0;
582 unsigned int nadded = 0;
583 unsigned int nncount = 0;
584 #if DNS_RDATASET_FIXED
585 unsigned int oncount;
586 unsigned int norder = 0;
587 unsigned int oorder = 0;
588 unsigned char *offsetbase;
589 unsigned int *offsettable;
593 * XXX Need parameter to allow "delete rdatasets in nslab" merge,
594 * or perhaps another merge routine for this purpose.
597 REQUIRE(tslabp != NULL && *tslabp == NULL);
598 REQUIRE(oslab != NULL && nslab != NULL);
600 ocurrent = oslab + reservelen;
601 ocount = *ocurrent++ * 256;
602 ocount += *ocurrent++;
603 #if DNS_RDATASET_FIXED
604 ocurrent += (4 * ocount);
607 ncurrent = nslab + reservelen;
608 ncount = *ncurrent++ * 256;
609 ncount += *ncurrent++;
610 #if DNS_RDATASET_FIXED
611 ncurrent += (4 * ncount);
613 INSIST(ocount > 0 && ncount > 0);
615 #if DNS_RDATASET_FIXED
620 * Yes, this is inefficient!
624 * Figure out the length of the old slab's data.
627 for (count = 0; count < ocount; count++) {
628 length = *ocurrent++ * 256;
629 length += *ocurrent++;
630 #if DNS_RDATASET_FIXED
631 olength += length + 8;
632 ocurrent += length + 2;
634 olength += length + 2;
640 * Start figuring out the target length and count.
642 tlength = reservelen + 2 + olength;
646 * Add in the length of rdata in the new slab that aren't in
650 dns_rdata_init(&nrdata);
651 rdata_from_slab(&ncurrent, rdclass, type, &nrdata);
652 if (!rdata_in_slab(oslab, reservelen, rdclass, type, &nrdata))
655 * This rdata isn't in the old slab.
657 #if DNS_RDATASET_FIXED
658 tlength += nrdata.length + 8;
660 tlength += nrdata.length + 2;
662 if (type == dns_rdatatype_rrsig)
666 added_something = ISC_TRUE;
669 } while (ncount > 0);
672 if (((flags & DNS_RDATASLAB_EXACT) != 0) &&
673 (tcount != ncount + ocount))
674 return (DNS_R_NOTEXACT);
676 if (!added_something && (flags & DNS_RDATASLAB_FORCE) == 0)
677 return (DNS_R_UNCHANGED);
680 * Ensure that singleton types are actually singletons.
682 if (tcount > 1 && dns_rdatatype_issingleton(type)) {
684 * We have a singleton type, but there's more than one
685 * RR in the rdataset.
687 return (DNS_R_SINGLETON);
691 return (ISC_R_NOSPACE);
694 * Copy the reserved area from the new slab.
696 tstart = isc_mem_get(mctx, tlength);
698 return (ISC_R_NOMEMORY);
699 memcpy(tstart, nslab, reservelen);
700 tcurrent = tstart + reservelen;
701 #if DNS_RDATASET_FIXED
702 offsetbase = tcurrent;
706 * Write the new count.
708 *tcurrent++ = (tcount & 0xff00) >> 8;
709 *tcurrent++ = (tcount & 0x00ff);
711 #if DNS_RDATASET_FIXED
715 tcurrent += (tcount * 4);
717 offsettable = isc_mem_get(mctx,
718 (ocount + oncount) * sizeof(unsigned int));
719 if (offsettable == NULL) {
720 isc_mem_put(mctx, tstart, tlength);
721 return (ISC_R_NOMEMORY);
723 memset(offsettable, 0, (ocount + oncount) * sizeof(unsigned int));
727 * Merge the two slabs.
731 #if DNS_RDATASET_FIXED
732 oorder = ocurrent[2] * 256 + ocurrent[3];
733 INSIST(oorder < ocount);
735 rdata_from_slab(&ocurrent, rdclass, type, &ordata);
737 ncurrent = nslab + reservelen + 2;
738 #if DNS_RDATASET_FIXED
739 ncurrent += (4 * oncount);
744 dns_rdata_reset(&nrdata);
745 #if DNS_RDATASET_FIXED
746 norder = ncurrent[2] * 256 + ncurrent[3];
748 INSIST(norder < oncount);
750 rdata_from_slab(&ncurrent, rdclass, type, &nrdata);
751 } while (rdata_in_slab(oslab, reservelen, rdclass,
755 while (oadded < ocount || nadded < ncount) {
756 isc_boolean_t fromold;
757 if (oadded == ocount)
759 else if (nadded == ncount)
762 fromold = ISC_TF(compare_rdata(&ordata, &nrdata) < 0);
764 #if DNS_RDATASET_FIXED
765 offsettable[oorder] = tcurrent - offsetbase;
767 length = ordata.length;
769 if (type == dns_rdatatype_rrsig) {
773 *tcurrent++ = (length & 0xff00) >> 8;
774 *tcurrent++ = (length & 0x00ff);
775 #if DNS_RDATASET_FIXED
776 tcurrent += 2; /* fill in later */
778 memcpy(tcurrent, data, length);
781 if (oadded < ocount) {
782 dns_rdata_reset(&ordata);
783 #if DNS_RDATASET_FIXED
784 oorder = ocurrent[2] * 256 + ocurrent[3];
785 INSIST(oorder < ocount);
787 rdata_from_slab(&ocurrent, rdclass, type,
791 #if DNS_RDATASET_FIXED
792 offsettable[ocount + norder] = tcurrent - offsetbase;
794 length = nrdata.length;
796 if (type == dns_rdatatype_rrsig) {
800 *tcurrent++ = (length & 0xff00) >> 8;
801 *tcurrent++ = (length & 0x00ff);
802 #if DNS_RDATASET_FIXED
803 tcurrent += 2; /* fill in later */
805 memcpy(tcurrent, data, length);
808 if (nadded < ncount) {
810 dns_rdata_reset(&nrdata);
811 #if DNS_RDATASET_FIXED
812 norder = ncurrent[2] * 256 + ncurrent[3];
813 INSIST(norder < oncount);
815 rdata_from_slab(&ncurrent, rdclass,
817 } while (rdata_in_slab(oslab, reservelen,
824 #if DNS_RDATASET_FIXED
825 fillin_offsets(offsetbase, offsettable, ocount + oncount);
827 isc_mem_put(mctx, offsettable,
828 (ocount + oncount) * sizeof(unsigned int));
831 INSIST(tcurrent == tstart + tlength);
835 return (ISC_R_SUCCESS);
839 dns_rdataslab_subtract(unsigned char *mslab, unsigned char *sslab,
840 unsigned int reservelen, isc_mem_t *mctx,
841 dns_rdataclass_t rdclass, dns_rdatatype_t type,
842 unsigned int flags, unsigned char **tslabp)
844 unsigned char *mcurrent, *sstart, *scurrent, *tstart, *tcurrent;
845 unsigned int mcount, scount, rcount ,count, tlength, tcount, i;
846 dns_rdata_t srdata = DNS_RDATA_INIT;
847 dns_rdata_t mrdata = DNS_RDATA_INIT;
848 #if DNS_RDATASET_FIXED
849 unsigned char *offsetbase;
850 unsigned int *offsettable;
854 REQUIRE(tslabp != NULL && *tslabp == NULL);
855 REQUIRE(mslab != NULL && sslab != NULL);
857 mcurrent = mslab + reservelen;
858 mcount = *mcurrent++ * 256;
859 mcount += *mcurrent++;
860 scurrent = sslab + reservelen;
861 scount = *scurrent++ * 256;
862 scount += *scurrent++;
863 INSIST(mcount > 0 && scount > 0);
866 * Yes, this is inefficient!
870 * Start figuring out the target length and count.
872 tlength = reservelen + 2;
876 #if DNS_RDATASET_FIXED
877 mcurrent += 4 * mcount;
878 scurrent += 4 * scount;
883 * Add in the length of rdata in the mslab that aren't in
886 for (i = 0; i < mcount; i++) {
887 unsigned char *mrdatabegin = mcurrent;
888 rdata_from_slab(&mcurrent, rdclass, type, &mrdata);
890 for (count = 0; count < scount; count++) {
891 dns_rdata_reset(&srdata);
892 rdata_from_slab(&scurrent, rdclass, type, &srdata);
893 if (dns_rdata_compare(&mrdata, &srdata) == 0)
896 if (count == scount) {
898 * This rdata isn't in the sslab, and thus isn't
901 tlength += mcurrent - mrdatabegin;
905 dns_rdata_reset(&mrdata);
908 #if DNS_RDATASET_FIXED
909 tlength += (4 * tcount);
913 * Check that all the records originally existed. The numeric
914 * check only works as rdataslabs do not contain duplicates.
916 if (((flags & DNS_RDATASLAB_EXACT) != 0) && (rcount != scount))
917 return (DNS_R_NOTEXACT);
920 * Don't continue if the new rdataslab would be empty.
923 return (DNS_R_NXRRSET);
926 * If nothing is going to change, we can stop.
929 return (DNS_R_UNCHANGED);
932 * Copy the reserved area from the mslab.
934 tstart = isc_mem_get(mctx, tlength);
936 return (ISC_R_NOMEMORY);
937 memcpy(tstart, mslab, reservelen);
938 tcurrent = tstart + reservelen;
939 #if DNS_RDATASET_FIXED
940 offsetbase = tcurrent;
942 offsettable = isc_mem_get(mctx, mcount * sizeof(unsigned int));
943 if (offsettable == NULL) {
944 isc_mem_put(mctx, tstart, tlength);
945 return (ISC_R_NOMEMORY);
947 memset(offsettable, 0, mcount * sizeof(unsigned int));
951 * Write the new count.
953 *tcurrent++ = (tcount & 0xff00) >> 8;
954 *tcurrent++ = (tcount & 0x00ff);
956 #if DNS_RDATASET_FIXED
957 tcurrent += (4 * tcount);
961 * Copy the parts of mslab not in sslab.
963 mcurrent = mslab + reservelen;
964 mcount = *mcurrent++ * 256;
965 mcount += *mcurrent++;
966 #if DNS_RDATASET_FIXED
967 mcurrent += (4 * mcount);
969 for (i = 0; i < mcount; i++) {
970 unsigned char *mrdatabegin = mcurrent;
971 #if DNS_RDATASET_FIXED
972 order = mcurrent[2] * 256 + mcurrent[3];
973 INSIST(order < mcount);
975 rdata_from_slab(&mcurrent, rdclass, type, &mrdata);
977 for (count = 0; count < scount; count++) {
978 dns_rdata_reset(&srdata);
979 rdata_from_slab(&scurrent, rdclass, type, &srdata);
980 if (dns_rdata_compare(&mrdata, &srdata) == 0)
983 if (count == scount) {
985 * This rdata isn't in the sslab, and thus should be
986 * copied to the tslab.
988 unsigned int length = mcurrent - mrdatabegin;
989 #if DNS_RDATASET_FIXED
990 offsettable[order] = tcurrent - offsetbase;
992 memcpy(tcurrent, mrdatabegin, length);
995 dns_rdata_reset(&mrdata);
998 #if DNS_RDATASET_FIXED
999 fillin_offsets(offsetbase, offsettable, mcount);
1001 isc_mem_put(mctx, offsettable, mcount * sizeof(unsigned int));
1004 INSIST(tcurrent == tstart + tlength);
1008 return (ISC_R_SUCCESS);
1012 dns_rdataslab_equal(unsigned char *slab1, unsigned char *slab2,
1013 unsigned int reservelen)
1015 unsigned char *current1, *current2;
1016 unsigned int count1, count2;
1017 unsigned int length1, length2;
1019 current1 = slab1 + reservelen;
1020 count1 = *current1++ * 256;
1021 count1 += *current1++;
1023 current2 = slab2 + reservelen;
1024 count2 = *current2++ * 256;
1025 count2 += *current2++;
1027 if (count1 != count2)
1030 #if DNS_RDATASET_FIXED
1031 current1 += (4 * count1);
1032 current2 += (4 * count2);
1035 while (count1 > 0) {
1036 length1 = *current1++ * 256;
1037 length1 += *current1++;
1039 length2 = *current2++ * 256;
1040 length2 += *current2++;
1042 #if DNS_RDATASET_FIXED
1047 if (length1 != length2 ||
1048 memcmp(current1, current2, length1) != 0)
1051 current1 += length1;
1052 current2 += length1;
1060 dns_rdataslab_equalx(unsigned char *slab1, unsigned char *slab2,
1061 unsigned int reservelen, dns_rdataclass_t rdclass,
1062 dns_rdatatype_t type)
1064 unsigned char *current1, *current2;
1065 unsigned int count1, count2;
1066 dns_rdata_t rdata1 = DNS_RDATA_INIT;
1067 dns_rdata_t rdata2 = DNS_RDATA_INIT;
1069 current1 = slab1 + reservelen;
1070 count1 = *current1++ * 256;
1071 count1 += *current1++;
1073 current2 = slab2 + reservelen;
1074 count2 = *current2++ * 256;
1075 count2 += *current2++;
1077 if (count1 != count2)
1080 #if DNS_RDATASET_FIXED
1081 current1 += (4 * count1);
1082 current2 += (4 * count2);
1085 while (count1-- > 0) {
1086 rdata_from_slab(¤t1, rdclass, type, &rdata1);
1087 rdata_from_slab(¤t2, rdclass, type, &rdata2);
1088 if (dns_rdata_compare(&rdata1, &rdata2) != 0)
1090 dns_rdata_reset(&rdata1);
1091 dns_rdata_reset(&rdata2);