src/stream/ZStream_PageBuffered.h

/*  @(#) $Id: ZStream_PageBuffered.h,v 1.11 2006/04/27 03:19:32 agreen Exp $ */

/* ------------------------------------------------------------
Copyright (c) 2000 Andrew Green and Learning in Motion, Inc.
http://www.zoolib.org

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
COPYRIGHT HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
------------------------------------------------------------ */

#ifndef __ZStream_PageBuffered__
#define __ZStream_PageBuffered__ 1
#include "zconfig.h"

#include "ZStreamer.h"

// =================================================================================================
#pragma mark -
#pragma mark * ZStreamRPos_PageBuffered

class ZStreamRPos_PageBuffered : public ZStreamRPos
        {
public:
        ZStreamRPos_PageBuffered(
                size_t iBufferCount, size_t iBufferSize, const ZStreamRPos& iStreamReal);

        ~ZStreamRPos_PageBuffered();

// From ZStreamR via ZStreamRPos
        virtual void Imp_Read(void* iDest, size_t iCount, size_t* oCountRead);
        virtual size_t Imp_CountReadable();
        virtual void Imp_Skip(uint64 iCount, uint64* oCountSkipped);

// From ZStreamRPos
        virtual uint64 Imp_GetPosition();
        virtual void Imp_SetPosition(uint64 iPosition);

        virtual uint64 Imp_GetSize();

protected:
        void Internal_Init(size_t iBufferCount, size_t iBufferSize);

        const ZStreamRPos& fStreamReal;
        struct Buffer;

        Buffer* fBuffer_Head;
        Buffer* fBuffer_Tail;
        size_t fBufferSize;

        uint64 fPosition;
        };

// =================================================================================================
#pragma mark -
#pragma mark * ZStreamerRPos_PageBuffered


class ZStreamerRPos_PageBuffered : public ZStreamerRPos
        {
public:
        ZStreamerRPos_PageBuffered(
                size_t iBufferCount, size_t iBufferSize, ZRef<ZStreamerRPos> iStreamerSource);

        virtual ~ZStreamerRPos_PageBuffered();

// From ZStreamerRPos
        virtual const ZStreamRPos& GetStreamRPos();

protected:
        ZRef<ZStreamerRPos> fStreamerSource;
        ZStreamRPos_PageBuffered fStream;
        };

// =================================================================================================
#pragma mark -
#pragma mark * ZStreamRWPos_PageBuffered

class ZStreamRWPos_PageBuffered : public ZStreamRWPos
        {
public:
        ZStreamRWPos_PageBuffered(
                size_t iBufferCount, size_t iBufferSize, const ZStreamRWPos& iStreamReal);

        ~ZStreamRWPos_PageBuffered();

// From ZStreamR via ZStreamRWPos
        virtual void Imp_Read(void* iDest, size_t iCount, size_t* oCountRead);

// From ZStreamW via ZStreamRWPos
        virtual void Imp_Write(const void* iSource, size_t iCount, size_t* oCountWritten);
        virtual void Imp_Flush();

// From ZStreamRPos/ZStreamWPos via ZStreamRWPos
        virtual uint64 Imp_GetPosition();
        virtual void Imp_SetPosition(uint64 iPosition);

        virtual uint64 Imp_GetSize();

// From ZStreamWPos via ZStreamRWPos
        virtual void Imp_SetSize(uint64 iSize);

protected:
        void Internal_Init(size_t iBufferCount, size_t iBufferSize);

        const ZStreamRWPos& fStreamReal;
        struct Buffer;

        Buffer* fBuffer_Head;
        Buffer* fBuffer_Tail;
        size_t fBufferSize;

        uint64 fPosition;
        };

// =================================================================================================
#pragma mark -
#pragma mark * ZStreamerRWPos_PageBuffered


class ZStreamerRWPos_PageBuffered : public ZStreamerRWPos
        {
public:
        ZStreamerRWPos_PageBuffered(
                size_t iBufferCount, size_t iBufferSize, ZRef<ZStreamerRWPos> iStreamerReal);

        virtual ~ZStreamerRWPos_PageBuffered();

// From ZStreamerRWPos
        virtual const ZStreamRWPos& GetStreamRWPos();

protected:
        ZRef<ZStreamerRWPos> fStreamerReal;
        ZStreamRWPos_PageBuffered fStream;
        };

#endif // __ZStream_PageBuffered__

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