src/stream/ZStream_Limited.h

/*  @(#) $Id: ZStream_Limited.h,v 1.7 2006/04/27 03:19:32 agreen Exp $ */

/* ------------------------------------------------------------
Copyright (c) 2004 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_Limited__
#define __ZStream_Limited__ 1

#include "zconfig.h"

#include "ZStream.h"
#include "ZStreamer.h"

// =================================================================================================
#pragma mark -
#pragma mark * ZStreamR_Limited


class ZStreamR_Limited : public ZStreamR
        {
public:
        ZStreamR_Limited(uint64 iLimit, const ZStreamR& iStreamSource);
        ~ZStreamR_Limited();

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

        virtual void Imp_CopyToDispatch(const ZStreamW& iStreamW, uint64 iCount,
                uint64* oCountRead, uint64* oCountWritten);

        virtual void Imp_CopyTo(const ZStreamW& iStreamW, uint64 iCount,
                uint64* oCountRead, uint64* oCountWritten);

        virtual void Imp_Skip(uint64 iCount, uint64* oCountSkipped);

protected:
        const ZStreamR& fStreamSource;
        uint64 fCountRemaining;
        };

// typedef ZStreamerR_FT<ZStreamR_Limited> ZStreamerR_Limited;

// =================================================================================================
#pragma mark -
#pragma mark * ZStreamW_Limited


class ZStreamW_Limited : public ZStreamW
        {
public:
        ZStreamW_Limited(uint64 iLimit, const ZStreamW& iStreamSink);
        ~ZStreamW_Limited();

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

protected:
        const ZStreamW& fStreamSink;
        uint64 fCountRemaining;
        };

// typedef ZStreamerW_FT<ZStreamW_Limited> ZStreamerW_Limited;

// =================================================================================================
#pragma mark -
#pragma mark * ZStreamRPos_Limited

class ZStreamRPos_Limited : public ZStreamRPos
        {
public:
        ZStreamRPos_Limited(uint64 iOffset, uint64 iLimit, const ZStreamRPos& iStreamSource);
        ~ZStreamRPos_Limited();

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

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

        virtual uint64 Imp_GetSize();

protected:
        const ZStreamRPos& fStreamSource;
        uint64 fOffset;
        uint64 fLimit;
        };

// =================================================================================================
#pragma mark -
#pragma mark * ZStreamerRPos_Limited


class ZStreamerRPos_Limited : public ZStreamerRPos
        {
public:
        ZStreamerRPos_Limited(uint64 iOffset, uint64 iLimit, ZRef<ZStreamerRPos> iStreamer);

        virtual ~ZStreamerRPos_Limited();

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

protected:
        ZRef<ZStreamerRPos> fStreamer;
        ZStreamRPos_Limited fStream;
        };


#endif // __ZStream_Limited__

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