Imported existing code

indra/llmessage/llpacketring.h

@@ -0,0 +1,107 @@
+/** 
+ * @file llpacketring.h
+ * @brief definition of LLPacketRing class for implementing a resend,
+ * drop, or delay in packet transmissions
+ *
+ * $LicenseInfo:firstyear=2001&license=viewergpl$
+ * 
+ * Copyright (c) 2001-2009, Linden Research, Inc.
+ * 
+ * Second Life Viewer Source Code
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at
+ * http://secondlifegrid.net/programs/open_source/licensing/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_LLPACKETRING_H
+#define LL_LLPACKETRING_H
+
+#include <queue>
+
+#include "llpacketbuffer.h"
+#include "llhost.h"
+#include "net.h"
+#include "llthrottle.h"
+
+
+class LLPacketRing
+{
+public:
+	LLPacketRing();         
+    ~LLPacketRing();
+
+	void cleanup();
+
+	void dropPackets(U32);	
+	void setDropPercentage (F32 percent_to_drop);
+	void setUseInThrottle(const BOOL use_throttle);
+	void setUseOutThrottle(const BOOL use_throttle);
+	void setInBandwidth(const F32 bps);
+	void setOutBandwidth(const F32 bps);
+	S32  receivePacket (S32 socket, char *datap);
+	S32  receiveFromRing (S32 socket, char *datap);
+
+	BOOL sendPacket(int h_socket, char * send_buffer, S32 buf_size, LLHost host);
+
+	inline LLHost getLastSender();
+	inline LLHost getLastReceivingInterface();
+
+	S32 getAndResetActualInBits()				{ S32 bits = mActualBitsIn; mActualBitsIn = 0; return bits;}
+	S32 getAndResetActualOutBits()				{ S32 bits = mActualBitsOut; mActualBitsOut = 0; return bits;}
+protected:
+	BOOL mUseInThrottle;
+	BOOL mUseOutThrottle;
+	
+	// For simulating a lower-bandwidth connection - BPS
+	LLThrottle mInThrottle;
+	LLThrottle mOutThrottle;
+
+	S32 mActualBitsIn;
+	S32 mActualBitsOut;
+	S32 mMaxBufferLength;			// How much data can we queue up before dropping data.
+	S32 mInBufferLength;			// Current incoming buffer length
+	S32 mOutBufferLength;			// Current outgoing buffer length
+
+	F32 mDropPercentage;			// % of packets to drop
+	U32 mPacketsToDrop;				// drop next n packets
+
+	std::queue<LLPacketBuffer *> mReceiveQueue;
+	std::queue<LLPacketBuffer *> mSendQueue;
+
+	LLHost mLastSender;
+	LLHost mLastReceivingIF;
+
+	BOOL doSendPacket(int h_socket, const char * send_buffer, S32 buf_size, LLHost host);
+	U8	 mProxyWrappedSendBuffer[NET_BUFFER_SIZE];
+};
+
+
+inline LLHost LLPacketRing::getLastSender()
+{
+	return mLastSender;
+}
+
+inline LLHost LLPacketRing::getLastReceivingInterface()
+{
+	return mLastReceivingIF;
+}
+
+#endif