source/dng_file_stream.h

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// 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_file_stream.h#1 $ */ 
/* $DateTime: 2012/05/30 13:28:51 $ */
/* $Change: 832332 $ */
/* $Author: tknoll $ */

/** \file
 * Simple, portable, file read/write support.
 */

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#ifndef __dng_file_stream__
#define __dng_file_stream__

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#include "dng_stream.h"

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/// \brief A stream to/from a disk file. See dng_stream for read/write interface

class dng_file_stream: public dng_stream
	{
	
	private:
	
		FILE *fFile;
	
	public:
	
		/// Open a stream on a file.
		/// \param filename Pathname in platform synax.
		/// \param output Set to true if writing, false otherwise.
		/// \param bufferSize size of internal buffer to use. Defaults to 4k.

		dng_file_stream (const char *filename,
						 bool output = false,
						 uint32 bufferSize = kDefaultBufferSize);
		
		virtual ~dng_file_stream ();
	
	protected:
	
		virtual uint64 DoGetLength ();
	
		virtual void DoRead (void *data,
							 uint32 count,
							 uint64 offset);
		
		virtual void DoWrite (const void *data,
							  uint32 count,
							  uint64 offset);
		
	private:
	
		// Hidden copy constructor and assignment operator.
	
		dng_file_stream (const dng_file_stream &stream);
		
		dng_file_stream & operator= (const dng_file_stream &stream);
		
	};
		
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#endif
	
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