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 "get_item_attributes.h"
18
19 namespace bluetooth {
20 namespace avrcp {
21
22 std::unique_ptr<GetItemAttributesResponseBuilder>
MakeBuilder(Status status,size_t mtu)23 GetItemAttributesResponseBuilder::MakeBuilder(Status status, size_t mtu) {
24 std::unique_ptr<GetItemAttributesResponseBuilder> builder(
25 new GetItemAttributesResponseBuilder(status, mtu));
26
27 return builder;
28 }
29
AddAttributeEntry(AttributeEntry entry)30 size_t GetItemAttributesResponseBuilder::AddAttributeEntry(
31 AttributeEntry entry) {
32 log::assert_that(entries_.size() < 0xFF,
33 "assert failed: entries_.size() < 0xFF");
34
35 size_t remaining_space = mtu_ - size();
36 if (entry.size() > remaining_space) {
37 entry.resize(remaining_space);
38 }
39
40 if (entry.empty()) {
41 return 0;
42 }
43
44 entries_.insert(entry);
45 return entry.size();
46 }
47
AddAttributeEntry(Attribute attribute,const std::string & value)48 size_t GetItemAttributesResponseBuilder::AddAttributeEntry(
49 Attribute attribute, const std::string& value) {
50 return AddAttributeEntry(AttributeEntry(attribute, value));
51 }
52
size() const53 size_t GetItemAttributesResponseBuilder::size() const {
54 size_t len = kHeaderSize();
55 if (status_ != Status::NO_ERROR) return kErrorHeaderSize();
56
57 for (const auto& entry : entries_) {
58 len += entry.size();
59 }
60 return len;
61 }
62
Serialize(const std::shared_ptr<::bluetooth::Packet> & pkt)63 bool GetItemAttributesResponseBuilder::Serialize(
64 const std::shared_ptr<::bluetooth::Packet>& pkt) {
65 ReserveSpace(pkt, size());
66
67 BrowsePacketBuilder::PushHeader(pkt, size() - BrowsePacket::kMinSize());
68
69 AddPayloadOctets1(pkt, (uint8_t)status_);
70 if (status_ != Status::NO_ERROR) return true;
71
72 AddPayloadOctets1(pkt, entries_.size());
73 for (const auto& entry : entries_) {
74 AddPayloadOctets4(pkt, base::ByteSwap((uint32_t)entry.attribute()));
75 uint16_t character_set = 0x006a; // UTF-8
76 AddPayloadOctets2(pkt, base::ByteSwap(character_set));
77 uint16_t value_length = entry.value().length();
78 AddPayloadOctets2(pkt, base::ByteSwap(value_length));
79 for (const uint8_t& byte : entry.value()) {
80 AddPayloadOctets1(pkt, byte);
81 }
82 }
83
84 return true;
85 }
86
GetScope() const87 Scope GetItemAttributesRequest::GetScope() const {
88 auto it = begin() + BrowsePacket::kMinSize();
89 return static_cast<Scope>(*it);
90 }
91
GetUid() const92 uint64_t GetItemAttributesRequest::GetUid() const {
93 auto it = begin() + BrowsePacket::kMinSize() + static_cast<size_t>(1);
94 return it.extractBE<uint64_t>();
95 }
96
GetUidCounter() const97 uint16_t GetItemAttributesRequest::GetUidCounter() const {
98 auto it = begin() + BrowsePacket::kMinSize() + static_cast<size_t>(9);
99 return it.extractBE<uint16_t>();
100 }
101
GetNumAttributes() const102 uint8_t GetItemAttributesRequest::GetNumAttributes() const {
103 auto it = begin() + BrowsePacket::kMinSize() + static_cast<size_t>(11);
104 return *it;
105 }
106
GetAttributesRequested() const107 std::vector<Attribute> GetItemAttributesRequest::GetAttributesRequested()
108 const {
109 auto it = begin() + BrowsePacket::kMinSize() + static_cast<size_t>(11);
110 size_t number_of_attributes = it.extract<uint8_t>();
111
112 std::vector<Attribute> attribute_list;
113 for (size_t i = 0; i < number_of_attributes; i++) {
114 attribute_list.push_back((Attribute)it.extractBE<uint32_t>());
115 }
116
117 return attribute_list;
118 }
119
IsValid() const120 bool GetItemAttributesRequest::IsValid() const {
121 if (!BrowsePacket::IsValid()) return false;
122 if (size() < kMinSize()) return false;
123
124 // Casting the int returned from end - attr_start should be fine. If an
125 // overflow occurs we can definitly say the packet is invalid
126 return (GetNumAttributes() * sizeof(Attribute)) == (size() - kMinSize());
127 }
128
ToString() const129 std::string GetItemAttributesRequest::ToString() const {
130 std::stringstream ss;
131 ss << "GetItemAttributesRequestPacket: " << std::endl;
132 ss << " └ PDU = " << GetPdu() << std::endl;
133 ss << " └ Length = " << GetLength() << std::endl;
134 ss << " └ Scope = " << GetScope() << std::endl;
135 ss << " └ UID Requested = " << loghex(GetUid()) << std::endl;
136 ss << " └ UID Counter = " << loghex(GetUidCounter()) << std::endl;
137 ss << " └ Num Attributes = " << loghex(GetNumAttributes()) << std::endl;
138
139 auto attr_list = GetAttributesRequested();
140 ss << " └ Attribute List: Size: " << attr_list.size() << std::endl;
141 for (auto it = attr_list.begin(); it != attr_list.end(); it++) {
142 ss << " └ " << loghex((uint32_t)(*it)) << std::endl;
143 }
144 ss << std::endl;
145
146 return ss.str();
147 }
148
149 } // namespace avrcp
150 } // namespace bluetooth
151