[EasyUnlock] Port PermitMessage class to native code.

components/proximity_auth/wire_message.h

 // Copyright 2014 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.
 
 #ifndef COMPONENTS_PROXIMITY_AUTH_WIRE_MESSAGE_H
 #define COMPONENTS_PROXIMITY_AUTH_WIRE_MESSAGE_H
 
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 
 namespace proximity_auth {
 
 class WireMessage {
  public:
   virtual ~WireMessage();
 
-  // Returns |true| iff the size of |message_bytes| is at least equal to the
-  // message length encoded in the message header. Returns false if the message
-  // header is not available.
-  static bool IsCompleteMessage(const std::string& message_bytes);
+  // Returns the deserialized message from |serialized_message|, or NULL if the
+  // message is malformed. Sets |is_incomplete_message| to true if the message
+  // does not have enough data to parse the header, or if the message length
+  // encoded in the message header exceeds the size of the |serialized_message|.
+  static scoped_ptr<WireMessage> Deserialize(
+      const std::string& serialized_message,
+      bool* is_incomplete_message);
 
-  // Returns the deserialized message from |serialized_message|, or NULL if the
-  // message is malformed.
-  static scoped_ptr<WireMessage> Deserialize(
-      const std::string& serialized_message);
+  const std::string& permit_id() const { return permit_id_; }
+  const std::string& payload() const { return payload_; }
 
  protected:
   // Visible for tests.
-  WireMessage();
+  WireMessage(const std::string& permit_id, const std::string& payload);
 
  private:
+  // Identifier of the permit being used.
+  // TODO(isherman): Describe in a bit more detail.
+  const std::string permit_id_;
+
+  // The message payload.
+  const std::string payload_;
+
   DISALLOW_COPY_AND_ASSIGN(WireMessage);
 };
 
 }  // namespace proximity_auth
 
 #endif  // COMPONENTS_PROXIMITY_AUTH_WIRE_MESSAGE_H