llxfer.h

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#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,LLExtStat);       
        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

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