Tony FinchandTony Finch
da2abb8840
dns_message_gettempname() allocates a dns_fixedname_t, which includes a buffer and an offsets vector, so it is not necessary to separately allocate a scratch buffer or a fresh offsets vector. When parsing a message, owner names are deduplicated to collect records into RRsets. This can require a lot of name comparisons. Add a place to keep a hash value inside a dns_fixedname_t, and use it to avoid comparisons. Together these speed up a large zone transfer by about 2.5%
52 lines
1.3 KiB
C
52 lines
1.3 KiB
C
/*
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* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
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*
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* SPDX-License-Identifier: MPL-2.0
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, you can obtain one at https://mozilla.org/MPL/2.0/.
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*
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* See the COPYRIGHT file distributed with this work for additional
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* information regarding copyright ownership.
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*/
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/*! \file */
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#include <dns/fixedname.h>
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void
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dns_fixedname_init(dns_fixedname_t *fixed) {
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dns_name_init(&fixed->name, fixed->offsets);
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isc_buffer_init(&fixed->buffer, fixed->data, DNS_NAME_MAXWIRE);
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dns_name_setbuffer(&fixed->name, &fixed->buffer);
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fixed->hash = 0;
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}
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void
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dns_fixedname_invalidate(dns_fixedname_t *fixed) {
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dns_name_invalidate(&fixed->name);
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}
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dns_name_t *
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dns_fixedname_name(dns_fixedname_t *fixed) {
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return (&fixed->name);
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}
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dns_name_t *
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dns_fixedname_initname(dns_fixedname_t *fixed) {
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dns_fixedname_init(fixed);
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return (dns_fixedname_name(fixed));
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}
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void
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dns_fixedname_hash(dns_fixedname_t *fixed) {
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fixed->hash = dns_name_hash(&fixed->name, false);
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}
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bool
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dns_fixedname_equal(dns_fixedname_t *fixed1, dns_fixedname_t *fixed2) {
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return (fixed1->hash == fixed2->hash &&
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dns_name_equal(&fixed1->name, &fixed2->name));
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}
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