From 6dba4310844ef59e339634b90d91bdc517c0dec8 Mon Sep 17 00:00:00 2001
From: Stephen Birarda <commit@birarda.com>
Date: Fri, 24 Jul 2015 11:38:51 -0700
Subject: [PATCH] initial version of the control packet class

---
 .../networking/src/udt/ControlPacket.cpp      | 54 ++++++++++++++++++
 libraries/networking/src/udt/ControlPacket.h  | 55 +++++++++++++++++++
 libraries/networking/src/udt/Packet.cpp       |  2 +-
 3 files changed, 110 insertions(+), 1 deletion(-)
 create mode 100644 libraries/networking/src/udt/ControlPacket.cpp
 create mode 100644 libraries/networking/src/udt/ControlPacket.h

diff --git a/libraries/networking/src/udt/ControlPacket.cpp b/libraries/networking/src/udt/ControlPacket.cpp
new file mode 100644
index 0000000000..ee3fef9f3a
--- /dev/null
+++ b/libraries/networking/src/udt/ControlPacket.cpp
@@ -0,0 +1,54 @@
+//
+//  ControlPacket.cpp
+//  libraries/networking/src/udt
+//
+//  Created by Stephen Birarda on 2015-07-24.
+//  Copyright 2015 High Fidelity, Inc.
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+//
+
+#include "ControlPacket.h"
+
+using namespace udt;
+
+std::unique_ptr<ControlPacket> ControlPacket::create(Type type, const SequenceNumberList& sequenceNumbers) {
+    return ControlPacket::create(type, sequenceNumbers);
+}
+
+qint64 ControlPacket::localHeaderSize() {
+    return sizeof(TypeAndSubSequenceNumber);
+}
+
+qint64 ControlPacket::totalHeadersSize() const {
+    return BasePacket::localHeaderSize() + localHeaderSize();
+}
+
+ControlPacket::ControlPacket(Type type, const SequenceNumberList& sequenceNumbers) :
+    BasePacket(localHeaderSize() + (sizeof(Packet::SequenceNumber) * sequenceNumbers.size()))
+{
+    qint64 headerSize = localHeaderSize();
+    
+    _payloadCapacity -= headerSize;
+    _payloadStart += headerSize;
+    
+    open(QIODevice::ReadWrite);
+    
+    // pack in the sequence numbers
+    for(auto& sequenceNumber : sequenceNumbers) {
+        writePrimitive(sequenceNumber);
+    }
+}
+
+ControlPacket::ControlPacket(ControlPacket&& other) :
+	BasePacket(std::move(other))
+{
+    
+}
+
+ControlPacket& ControlPacket::operator=(Packet&& other) {
+    BasePacket::operator=(std::move(other));
+    
+    return *this;
+}
diff --git a/libraries/networking/src/udt/ControlPacket.h b/libraries/networking/src/udt/ControlPacket.h
new file mode 100644
index 0000000000..2fa7200322
--- /dev/null
+++ b/libraries/networking/src/udt/ControlPacket.h
@@ -0,0 +1,55 @@
+//
+//  ControlPacket.h
+//  libraries/networking/src/udt
+//
+//  Created by Stephen Birarda on 2015-07-24.
+//  Copyright 2015 High Fidelity, Inc.
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+//
+
+#pragma once
+
+#ifndef hifi_ControlPacket_h
+#define hifi_ControlPacket_h
+
+#include <vector>
+
+#include "BasePacket.h"
+#include "Packet.h"
+
+namespace udt {
+    
+using SequenceNumberList = std::vector<Packet::SequenceNumber>;
+    
+class ControlPacket : public BasePacket {
+    Q_OBJECT
+public:
+    using TypeAndSubSequenceNumber = uint32_t;
+    
+    enum class Type : uint16_t {
+        ACK,
+        ACK2,
+        NAK,
+        PacketPair
+    };
+    
+    std::unique_ptr<ControlPacket> create(Type type, const SequenceNumberList& sequenceNumbers);
+    
+    static qint64 localHeaderSize(); // Current level's header size
+    virtual qint64 totalHeadersSize() const; // Cumulated size of all the headers
+    
+private:
+    ControlPacket(Type type, const SequenceNumberList& sequenceNumbers);
+    ControlPacket(ControlPacket&& other);
+    ControlPacket(const Packet& other) = delete;
+    
+    ControlPacket& operator=(Packet&& other);
+    ControlPacket& operator=(const Packet& other) = delete;
+};
+
+} // namespace udt
+
+
+#endif // hifi_ControlPacket_h
diff --git a/libraries/networking/src/udt/Packet.cpp b/libraries/networking/src/udt/Packet.cpp
index 47ea6ffef3..c041fec5da 100644
--- a/libraries/networking/src/udt/Packet.cpp
+++ b/libraries/networking/src/udt/Packet.cpp
@@ -50,7 +50,7 @@ qint64 Packet::maxPayloadSize() const {
 }
 
 qint64 Packet::totalHeadersSize() const {
-    return localHeaderSize();
+    return BasePacket::localHeaderSize() + localHeaderSize();
 }
 
 qint64 Packet::localHeaderSize() const {