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97 lines
2.6 KiB
97 lines
2.6 KiB
/*****************************************************************************/ |
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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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