1 /*
2 * Copyright 2018 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <algorithm>
18
19 #include "get_element_attributes_packet.h"
20
21 namespace bluetooth {
22 namespace avrcp {
23
GetIdentifier() const24 uint64_t GetElementAttributesRequest::GetIdentifier() const {
25 auto it = begin() + VendorPacket::kMinSize();
26 return it.extract<uint64_t>();
27 }
28
GetNumAttributes() const29 uint8_t GetElementAttributesRequest::GetNumAttributes() const {
30 auto it = begin() + VendorPacket::kMinSize() + static_cast<size_t>(8);
31 return it.extract<uint8_t>();
32 }
33
GetAttributesRequested() const34 std::vector<Attribute> GetElementAttributesRequest::GetAttributesRequested()
35 const {
36 auto it = begin() + VendorPacket::kMinSize() + static_cast<size_t>(8);
37
38 size_t number_of_attributes = it.extract<uint8_t>();
39
40 std::vector<Attribute> attribute_list;
41
42 for (size_t i = 0; i < number_of_attributes; i++) {
43 attribute_list.push_back((Attribute)it.extractBE<uint32_t>());
44 }
45
46 return attribute_list;
47 }
48
IsValid() const49 bool GetElementAttributesRequest::IsValid() const {
50 if (!VendorPacket::IsValid()) return false;
51 if (size() < kMinSize()) return false;
52
53 size_t num_attributes = GetNumAttributes();
54 auto attr_start = begin() + VendorPacket::kMinSize() + static_cast<size_t>(9);
55
56 // Casting the int returned from end - attr_start should be fine. If an
57 // overflow occurs we can definitly say the packet is invalid
58 return (num_attributes * sizeof(Attribute)) == (size_t)(end() - attr_start);
59 }
60
ToString() const61 std::string GetElementAttributesRequest::ToString() const {
62 std::stringstream ss;
63 ss << "RegisterNotificationPacket: " << std::endl;
64 ss << " └ cType = " << GetCType() << std::endl;
65 ss << " └ Subunit Type = " << loghex(GetSubunitType()) << std::endl;
66 ss << " └ Subunit ID = " << loghex(GetSubunitId()) << std::endl;
67 ss << " └ OpCode = " << GetOpcode() << std::endl;
68 ss << " └ Company ID = " << loghex(GetCompanyId()) << std::endl;
69 ss << " └ Command PDU = " << GetCommandPdu() << std::endl;
70 ss << " └ PacketType = " << GetPacketType() << std::endl;
71 ss << " └ Parameter Length = " << GetParameterLength() << std::endl;
72 ss << " └ Identifier = " << loghex(GetIdentifier()) << std::endl;
73
74 auto attr_list = GetAttributesRequested();
75
76 ss << " └ Attribute List: Size: " << attr_list.size() << std::endl;
77 for (auto it = attr_list.begin(); it != attr_list.end(); it++) {
78 ss << " └ " << loghex((uint32_t)(*it)) << std::endl;
79 }
80 ss << std::endl;
81
82 return ss.str();
83 }
84
85 std::unique_ptr<GetElementAttributesResponseBuilder>
MakeBuilder(size_t mtu)86 GetElementAttributesResponseBuilder::MakeBuilder(size_t mtu) {
87 std::unique_ptr<GetElementAttributesResponseBuilder> builder(
88 new GetElementAttributesResponseBuilder(mtu));
89
90 return builder;
91 }
92
AddAttributeEntry(AttributeEntry entry)93 bool GetElementAttributesResponseBuilder::AddAttributeEntry(
94 AttributeEntry entry) {
95 CHECK_LT(entries_.size(), size_t(0xFF))
96 << __func__ << ": attribute entry overflow";
97
98 size_t remaining_space = mtu_ - size();
99 if (entry.size() > remaining_space) {
100 entry.resize(remaining_space);
101 }
102
103 if (entry.empty()) {
104 return false;
105 }
106
107 entries_.insert(entry);
108 return true;
109 }
110
AddAttributeEntry(Attribute attribute,std::string value)111 bool GetElementAttributesResponseBuilder::AddAttributeEntry(Attribute attribute,
112 std::string value) {
113 return AddAttributeEntry(AttributeEntry(attribute, value));
114 }
115
size() const116 size_t GetElementAttributesResponseBuilder::size() const {
117 size_t attr_list_size = 0;
118
119 for (auto& attribute_entry : entries_) {
120 attr_list_size += attribute_entry.size();
121 }
122
123 return VendorPacket::kMinSize() + 1 + attr_list_size;
124 }
125
Serialize(const std::shared_ptr<::bluetooth::Packet> & pkt)126 bool GetElementAttributesResponseBuilder::Serialize(
127 const std::shared_ptr<::bluetooth::Packet>& pkt) {
128 ReserveSpace(pkt, size());
129
130 PacketBuilder::PushHeader(pkt);
131
132 VendorPacketBuilder::PushHeader(pkt, size() - VendorPacket::kMinSize());
133
134 AddPayloadOctets1(pkt, entries_.size());
135 for (const auto& attribute_entry : entries_) {
136 PushAttributeValue(pkt, attribute_entry);
137 }
138
139 return true;
140 }
141
142 } // namespace avrcp
143 } // namespace bluetooth
144