Add FIDO U2F message and packet classes

device/u2f/u2f_packet.h

Index: device/u2f/u2f_packet.h
diff --git a/device/u2f/u2f_packet.h b/device/u2f/u2f_packet.h
new file mode 100644
index 0000000000000000000000000000000000000000..cf8e96d57d31c798925c15f6bc089438430d3aeb
--- /dev/null
+++ b/device/u2f/u2f_packet.h
@@ -0,0 +1,64 @@
+// Copyright 2016 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 DEVICE_U2F_U2F_PACKET_H_
+#define DEVICE_U2F_U2F_PACKET_H_
+
+#include "base/macros.h"
+#include "net/base/io_buffer.h"
+
+namespace device {
+class U2fPacket : public base::RefCountedThreadSafe<U2fPacket> {
+ public:
+  static const size_t kChannelIdSize = 4;
+  // Packet size of 64 bytes + 1 byte report ID
+  static const size_t kPacketSize = 65;
+
+  U2fPacket(const std::vector<uint8_t> data,
+            const char channel_id[kChannelIdSize]);
+  scoped_refptr<net::IOBufferWithSize> GetBuffer();
+
+ protected:
+  std::vector<uint8_t> data_;
+  char channel_id_[kChannelIdSize];
+  scoped_refptr<net::IOBufferWithSize> serialized_;
+  virtual ~U2fPacket();
+  U2fPacket();
+
+ private:
+  friend class base::RefCountedThreadSafe<U2fPacket>;
+};
+
+class U2fInitPacket : public U2fPacket {
+ public:
+  U2fInitPacket(const char channel_id[kChannelIdSize],
+                const char cmd,
+                const std::vector<uint8_t> data,
+                const uint16_t payload_length);
+
+  scoped_refptr<U2fInitPacket> Create(scoped_refptr<net::IOBufferWithSize> buf);
+
+ protected:
+  ~U2fInitPacket() final;
+
+ private:
+  U2fInitPacket(scoped_refptr<net::IOBufferWithSize> buf);
+  char command_;
+};
+
+class U2fContPacket : public U2fPacket {
+ public:
+  U2fContPacket(const char channel_id[kChannelIdSize],
+                const char sequence,
+                std::vector<uint8_t> data);
+
+ protected:
+  ~U2fContPacket() final;
+
+ private:
+  char sequence_;
+};
+}  // namespace device
+
+#endif  // DEVICE_U2F_U2F_PACKET_H_