Add support for creating bluetooth RFCOMM sockets.

chrome/browser/chromeos/bluetooth/bluetooth_service_record.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chromeos/bluetooth/bluetooth_service_record.h"
 
 #include <string>
+#include <vector>
 
+#include "base/logging.h"
+#include "base/string_number_conversions.h"
 #include "chrome/common/libxml_utils.h"
 
 namespace {
 
 static const char* kAttributeNode = "attribute";
 static const char* kIdAttribute = "id";
+static const char* kProtocolDescriptorListId = "0x0004";
+static const char* kRfcommUuid = "0x0003";
 static const char* kSdpNameId = "0x0100";
+static const char* kSequenceNode = "sequence";
 static const char* kTextNode = "text";
+static const char* kUint8Node = "uint8";
+static const char* kUuidNode = "uuid";
 static const char* kValueAttribute = "value";
 
-bool advanceToTag(XmlReader* reader, const char* node_type) {
+bool AdvanceToTag(XmlReader* reader, const char* node_type) {
   do {
     if (!reader->Read())
       return false;
   } while (reader->NodeName() != node_type);
   return true;
 }
 
+bool ExtractTextValue(XmlReader* reader, std::string* value_out) {
+  if (AdvanceToTag(reader, kTextNode)) {
+    reader->NodeAttribute(kValueAttribute, value_out);
+    return true;
+  }
+  return false;
+}
+
 }  // namespace
 
 namespace chromeos {
 
-BluetoothServiceRecord::BluetoothServiceRecord(const std::string& xml_data) {
+BluetoothServiceRecord::BluetoothServiceRecord(
+    const std::string& address,
+    const std::string& xml_data)
+  : address_(address),
+    supports_rfcomm_(false) {
+
   XmlReader reader;
   if (!reader.Load(xml_data))
     return;
 
-  while (advanceToTag(&reader, kAttributeNode)) {
+  while (AdvanceToTag(&reader, kAttributeNode)) {
     std::string id;
     if (reader.NodeAttribute(kIdAttribute, &id)) {
       if (id == kSdpNameId) {
-        if (advanceToTag(&reader, kTextNode)) {
-          std::string value;
-          if (reader.NodeAttribute(kValueAttribute, &value))
-            name_ = value;
+        ExtractTextValue(&reader, &name_);
+      } else if (id == kProtocolDescriptorListId) {
+        if (AdvanceToTag(&reader, kSequenceNode)) {
+          ExtractChannels(&reader);
         }
       }
     }
     // We don't care about anything else here, so find the closing tag
-    advanceToTag(&reader, kAttributeNode);
+    AdvanceToTag(&reader, kAttributeNode);
   }
 }
 
+void BluetoothServiceRecord::ExtractChannels(XmlReader* reader) {
+  const int start_depth = reader->Depth();
+  do {
+    if (reader->NodeName() == kSequenceNode) {
+      if (AdvanceToTag(reader, kUuidNode)) {
+        std::string type;
+        if (reader->NodeAttribute(kValueAttribute, &type) &&
+            type == kRfcommUuid) {
+          if (AdvanceToTag(reader, kUint8Node)) {
+            std::string channel_string;
+            if (reader->NodeAttribute(kValueAttribute, &channel_string)) {
+              std::vector<uint8> channel_bytes;
+              if (base::HexStringToBytes(channel_string.substr(2),
+                    &channel_bytes)) {
+                if (channel_bytes.size() == 1) {
+                  rfcomm_channel_ = channel_bytes[0];
+                  supports_rfcomm_ = true;
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+  } while (AdvanceToTag(reader, kSequenceNode) &&
+      reader->Depth() != start_depth);
+}
+
 }  // namespace chromeos