Add FIDO U2F message and packet classes

device/u2f/u2f_message.h

+// 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_MESSAGE_H_
+#define DEVICE_U2F_U2F_MESSAGE_H_
+
+#include <list>
+#include <vector>
+#include "base/macros.h"
+#include "device/u2f/u2f_packet.h"
+
+namespace device {
+
+class U2fMessage : public base::RefCountedThreadSafe<U2fMessage> {
+ public:
+  enum u2f_message_type : char {

[Reilly Grant (use Gerrit), 2016/11/23 22:21:50]

Use an enum class named Type.

I'd rather we use uint8_t instead of char.

[Casey Piper, 2016/11/29 22:11:15]

Done.

+    CMD_PING = 0x81,
+    CMD_ATR = 0x82,
+    CMD_APDU = 0x83,
+    CMD_LOCK = 0x84,
+    CMD_SYSINFO = 0x85,
+    CMD_INIT = 0x86,
+    CMD_PROMPT = 0x87,
+    CMD_WINK = 0x88,
+    CMD_BLE_UID = 0xb5,
+    CMD_USB_TEST = 0xb9,
+    CMD_DFU = 0xba,
+    CMD_SYNC = 0xbc,
+    CMD_ERROR = 0xbf,
+  };
+
+  static const size_t kInitPacketHeader = 7;
+  static const size_t kContPacketHeader = 5;
+  static const size_t kInitPacketDataSize = 57;
+  static const size_t kContPacketDataSize = 59;
+
+  // Messages are limited to an init packet and 128 cont packets
+  // Maximum payload length therefore is 64-7 + 128 * (64-5) = 7609 bytes
+  static const size_t kMaxMessageSize = 7609;
+
+  U2fMessage(const char channel_id[U2fPacket::kChannelIdSize],
+             const u2f_message_type type,
+             const std::vector<char> data);

[Reilly Grant (use Gerrit), 2016/11/23 22:21:50]

Use std::vector<uint8_t> for byte strings.

[Casey Piper, 2016/11/29 22:11:15]

Done.

+
+  scoped_refptr<net::IOBufferWithSize> GetNextPacket();
+  size_t NumPackets();
+
+ private:
+  friend class base::RefCountedThreadSafe<U2fMessage>;
+  std::list<scoped_refptr<U2fPacket>> packets_;
+
+ protected:
+  virtual ~U2fMessage();
+};
+}

[Reilly Grant (use Gerrit), 2016/11/23 22:21:51]

}  // namespace device

[Casey Piper, 2016/11/29 22:11:15]

Done.

+
+#endif  // DEVICE_U2F_U2F_MESSAGE_H_