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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "chrome/browser/chromeos/bluetooth/bluetooth_service_record.h" | |
6 | |
7 #include <string> | |
8 #include <vector> | |
9 | |
10 #include "base/logging.h" | |
11 #include "base/string_number_conversions.h" | |
12 #include "chrome/browser/chromeos/bluetooth/bluetooth_utils.h" | |
13 #include "third_party/libxml/chromium/libxml_utils.h" | |
14 | |
15 namespace { | |
16 | |
17 static const char* kAttributeNode = "attribute"; | |
18 static const char* kIdAttribute = "id"; | |
19 static const char* kProtocolDescriptorListId = "0x0004"; | |
20 static const char* kRfcommUuid = "0x0003"; | |
21 static const char* kSdpNameId = "0x0100"; | |
22 static const char* kSequenceNode = "sequence"; | |
23 static const char* kTextNode = "text"; | |
24 static const char* kUint8Node = "uint8"; | |
25 static const char* kUuidId = "0x0001"; | |
26 static const char* kUuidNode = "uuid"; | |
27 static const char* kValueAttribute = "value"; | |
28 | |
29 bool AdvanceToTag(XmlReader* reader, const char* node_type) { | |
30 do { | |
31 if (!reader->Read()) | |
32 return false; | |
33 } while (reader->NodeName() != node_type); | |
34 return true; | |
35 } | |
36 | |
37 bool ExtractTextValue(XmlReader* reader, std::string* value_out) { | |
38 if (AdvanceToTag(reader, kTextNode)) { | |
39 reader->NodeAttribute(kValueAttribute, value_out); | |
40 return true; | |
41 } | |
42 return false; | |
43 } | |
44 | |
45 } // namespace | |
46 | |
47 namespace chromeos { | |
48 | |
49 BluetoothServiceRecord::BluetoothServiceRecord( | |
50 const std::string& address, | |
51 const std::string& xml_data) | |
52 : address_(address), | |
53 supports_rfcomm_(false) { | |
54 | |
55 XmlReader reader; | |
56 if (!reader.Load(xml_data)) | |
57 return; | |
58 | |
59 while (AdvanceToTag(&reader, kAttributeNode)) { | |
60 std::string id; | |
61 if (reader.NodeAttribute(kIdAttribute, &id)) { | |
62 if (id == kSdpNameId) { | |
63 ExtractTextValue(&reader, &name_); | |
64 } else if (id == kProtocolDescriptorListId) { | |
65 if (AdvanceToTag(&reader, kSequenceNode)) { | |
66 ExtractChannels(&reader); | |
67 } | |
68 } else if (id == kUuidId) { | |
69 if (AdvanceToTag(&reader, kSequenceNode)) { | |
70 ExtractUuid(&reader); | |
71 } | |
72 } | |
73 } | |
74 // We don't care about anything else here, so find the closing tag | |
75 AdvanceToTag(&reader, kAttributeNode); | |
76 } | |
77 } | |
78 | |
79 void BluetoothServiceRecord::ExtractChannels(XmlReader* reader) { | |
80 const int start_depth = reader->Depth(); | |
81 do { | |
82 if (reader->NodeName() == kSequenceNode) { | |
83 if (AdvanceToTag(reader, kUuidNode)) { | |
84 std::string type; | |
85 if (reader->NodeAttribute(kValueAttribute, &type) && | |
86 type == kRfcommUuid) { | |
87 if (AdvanceToTag(reader, kUint8Node)) { | |
88 std::string channel_string; | |
89 if (reader->NodeAttribute(kValueAttribute, &channel_string)) { | |
90 std::vector<uint8> channel_bytes; | |
91 if (base::HexStringToBytes(channel_string.substr(2), | |
92 &channel_bytes)) { | |
93 if (channel_bytes.size() == 1) { | |
94 rfcomm_channel_ = channel_bytes[0]; | |
95 supports_rfcomm_ = true; | |
96 } | |
97 } | |
98 } | |
99 } | |
100 } | |
101 } | |
102 } | |
103 } while (AdvanceToTag(reader, kSequenceNode) && | |
104 reader->Depth() != start_depth); | |
105 } | |
106 | |
107 void BluetoothServiceRecord::ExtractUuid(XmlReader* reader) { | |
108 const int start_depth = reader->Depth(); | |
109 do { | |
110 if (reader->NodeName() == kSequenceNode) { | |
111 if (AdvanceToTag(reader, kUuidNode)) { | |
112 if (!reader->NodeAttribute(kValueAttribute, &uuid_)) | |
113 uuid_.clear(); | |
114 } | |
115 } | |
116 } while (AdvanceToTag(reader, kSequenceNode) && | |
117 reader->Depth() != start_depth); | |
118 | |
119 uuid_ = bluetooth_utils::CanonicalUuid(uuid_); | |
120 } | |
121 | |
122 } // namespace chromeos | |
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