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diff --git a/linden/indra/llmessage/llxfer.h b/linden/indra/llmessage/llxfer.h
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+++ b/linden/indra/llmessage/llxfer.h
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+/** 
+ * @file llxfer.h
+ * @brief definition of LLXfer class for a single xfer
+ *
+ * Copyright (c) 2001-2007, Linden Research, Inc.
+ * 
+ * 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://secondlife.com/developers/opensource/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://secondlife.com/developers/opensource/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.
+ */
+
+#ifndef LL_LLXFER_H
+#define LL_LLXFER_H
+
+#include "message.h"
+#include "lltimer.h"
+
+const S32 LL_XFER_LARGE_PAYLOAD = 7680;
+
+typedef enum ELLXferStatus {
+        e_LL_XFER_UNINITIALIZED,
+        e_LL_XFER_REGISTERED,         // a buffer which has been registered as available for a request
+        e_LL_XFER_PENDING,            // a transfer which has been requested but is waiting for a free slot
+        e_LL_XFER_IN_PROGRESS,
+        e_LL_XFER_COMPLETE,
+        e_LL_XFER_ABORTED,
+        e_LL_XFER_NONE
+} ELLXferStatus;
+
+class LLXfer
+{
+ private:
+ protected:
+        S32 mChunkSize;
+  
+ public:
+        LLXfer *mNext;
+        U64 mID;
+        S32 mPacketNum;
+
+        LLHost mRemoteHost;
+        S32 mXferSize;
+
+        char *mBuffer;
+        U32 mBufferLength;
+        U32 mBufferStartOffset;
+        BOOL mBufferContainsEOF;
+
+        ELLXferStatus mStatus;
+
+        BOOL mWaitingForACK;
+
+        void (*mCallback)(void **,S32); 
+        void **mCallbackDataHandle;
+        S32 mCallbackResult;
+
+        LLTimer ACKTimer;
+        S32 mRetries;
+
+        static const U32 XFER_FILE;
+        static const U32 XFER_VFILE;
+        static const U32 XFER_MEM;
+
+ private:
+ protected:
+ public:
+        LLXfer (S32 chunk_size);
+        virtual ~LLXfer();
+
+        void init(S32 chunk_size);
+        virtual void free();
+
+        virtual S32 startSend (U64 xfer_id, const LLHost &remote_host);
+        virtual void sendPacket(S32 packet_num);
+        virtual void sendNextPacket();
+        virtual void resendLastPacket();
+        virtual S32 processEOF();
+        virtual S32 startDownload();
+        virtual S32 receiveData (char *datap, S32 data_size);
+        virtual void abort(S32);
+
+        virtual S32 suck(S32 start_position);
+        virtual S32 flush();
+        
+        virtual S32 encodePacketNum(S32 packet_num, BOOL is_eof);       
+        virtual void setXferSize (S32 data_size);
+        virtual S32  getMaxBufferSize();
+
+        virtual const char *getName();
+
+        virtual U32 getXferTypeTag();
+
+        friend std::ostream& operator<< (std::ostream& os, LLXfer &hh);
+
+};
+
+#endif
+
+
+
+