/*****************************************************************************/
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// Copyright 2006-2007 Adobe Systems Incorporated
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// All Rights Reserved.
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//
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// NOTICE: Adobe permits you to use, modify, and distribute this file in
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// accordance with the terms of the Adobe license agreement accompanying it.
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/*****************************************************************************/
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/* $Id: //mondo/dng_sdk_1_4/dng_sdk/source/dng_memory_stream.h#2 $ */
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/* $DateTime: 2012/07/31 22:04:34 $ */
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/* $Change: 840853 $ */
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/* $Author: tknoll $ */
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/** \file
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* Stream abstraction to/from in-memory data.
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*/
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/*****************************************************************************/
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#ifndef __dng_memory_stream__
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#define __dng_memory_stream__
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/*****************************************************************************/
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#include "dng_stream.h"
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/*****************************************************************************/
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/// \brief A dng_stream which can be read from or written to memory.
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///
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/// Stream is populated via writing and either read or accessed by asking for contents as a pointer.
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class dng_memory_stream: public dng_stream
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{
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protected:
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dng_memory_allocator &fAllocator;
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uint32 fPageSize;
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uint32 fPageCount;
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uint32 fPagesAllocated;
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dng_memory_block **fPageList;
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uint64 fMemoryStreamLength;
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public:
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/// Construct a new memory-based stream.
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/// \param allocator Allocator to use to allocate memory in stream as needed.
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/// \param sniffer If non-NULL used to check for user cancellation.
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/// \param pageSize Unit of allocation for data stored in stream.
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dng_memory_stream (dng_memory_allocator &allocator,
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dng_abort_sniffer *sniffer = NULL,
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uint32 pageSize = 64 * 1024);
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virtual ~dng_memory_stream ();
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/// Copy a specified number of bytes to a target stream.
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/// \param dstStream The target stream.
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/// \param count The number of bytes to copy.
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virtual void CopyToStream (dng_stream &dstStream,
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uint64 count);
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protected:
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virtual uint64 DoGetLength ();
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virtual void DoRead (void *data,
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uint32 count,
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uint64 offset);
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virtual void DoSetLength (uint64 length);
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virtual void DoWrite (const void *data,
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uint32 count,
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uint64 offset);
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private:
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// Hidden copy constructor and assignment operator.
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dng_memory_stream (const dng_memory_stream &stream);
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dng_memory_stream & operator= (const dng_memory_stream &stream);
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};
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/*****************************************************************************/
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#endif
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/*****************************************************************************/
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