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