1 /*
2 * Copyright (c) 2016-21, The OpenThread Authors.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. Neither the name of the copyright holder nor the
13 * names of its contributors may be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 /**
30 * @file
31 * This file implements methods for generating and processing Thread Network Data TLVs.
32 */
33
34 #include "network_data_tlvs.hpp"
35
36 namespace ot {
37 namespace NetworkData {
38
39 //---------------------------------------------------------------------------------------------------------------------
40 // NetworkDataTlv
41
Find(const NetworkDataTlv * aStart,const NetworkDataTlv * aEnd,Type aType)42 const NetworkDataTlv *NetworkDataTlv::Find(const NetworkDataTlv *aStart, const NetworkDataTlv *aEnd, Type aType)
43 {
44 const NetworkDataTlv *tlv;
45
46 for (tlv = aStart; (tlv + 1 <= aEnd) && (tlv->GetNext() <= aEnd); tlv = tlv->GetNext())
47 {
48 if (tlv->GetType() == aType)
49 {
50 ExitNow();
51 }
52 }
53
54 tlv = nullptr;
55
56 exit:
57 return tlv;
58 }
59
Find(const NetworkDataTlv * aStart,const NetworkDataTlv * aEnd,Type aType,bool aStable)60 const NetworkDataTlv *NetworkDataTlv::Find(const NetworkDataTlv *aStart,
61 const NetworkDataTlv *aEnd,
62 Type aType,
63 bool aStable)
64 {
65 const NetworkDataTlv *tlv;
66
67 for (tlv = aStart; (tlv + 1 <= aEnd) && (tlv->GetNext() <= aEnd); tlv = tlv->GetNext())
68 {
69 if ((tlv->GetType() == aType) && (tlv->IsStable() == aStable))
70 {
71 ExitNow();
72 }
73 }
74
75 tlv = nullptr;
76
77 exit:
78 return tlv;
79 }
80
81 //---------------------------------------------------------------------------------------------------------------------
82 // PrefixTlv
83
FindSubTlv(Type aType) const84 const NetworkDataTlv *PrefixTlv::FindSubTlv(Type aType) const
85 {
86 return Find(GetSubTlvs(), GetNext(), aType);
87 }
88
FindSubTlv(Type aType,bool aStable) const89 const NetworkDataTlv *PrefixTlv::FindSubTlv(Type aType, bool aStable) const
90 {
91 return Find(GetSubTlvs(), GetNext(), aType, aStable);
92 }
93
94 //---------------------------------------------------------------------------------------------------------------------
95 // TlvIterator
96
Iterate(NetworkDataTlv::Type aType)97 const NetworkDataTlv *TlvIterator::Iterate(NetworkDataTlv::Type aType)
98 {
99 const NetworkDataTlv *tlv = NetworkDataTlv::Find(mStart, mEnd, aType);
100
101 VerifyOrExit(tlv != nullptr);
102 mStart = tlv->GetNext();
103
104 exit:
105 return tlv;
106 }
107
Iterate(NetworkDataTlv::Type aType,bool aStable)108 const NetworkDataTlv *TlvIterator::Iterate(NetworkDataTlv::Type aType, bool aStable)
109 {
110 const NetworkDataTlv *tlv = NetworkDataTlv::Find(mStart, mEnd, aType, aStable);
111
112 VerifyOrExit(tlv != nullptr);
113 mStart = tlv->GetNext();
114
115 exit:
116 return tlv;
117 }
118
119 } // namespace NetworkData
120 } // namespace ot
121
