Application: gvSIG desktop

/* $Id: lt_ioMemStream.h 3539 2006-01-09 12:23:20Z nacho $ */

/* //////////////////////////////////////////////////////////////////////////

//                                                                         //

// This code is Copyright (c) 2004 LizardTech, Inc, 1008 Western Avenue,   //

// Suite 200, Seattle, WA 98104.  Unauthorized use or distribution         //

// prohibited.  Access to and use of this code is permitted only under     //

// license from LizardTech, Inc.  Portions of the code are protected by    //

// US and foreign patents and other filings. All Rights Reserved.          //

//                                                                         //

////////////////////////////////////////////////////////////////////////// */

/* PUBLIC */

#ifndef LT_IO_MEM_STREAM_H

#define LT_IO_MEM_STREAM_H

#include "lt_ioStreamInf.h"

LT_BEGIN_NAMESPACE( LizardTech )

/**

 * Stream which wraps an array of bytes in memory.

 *

 * The buffer is of a fixed size and does not grow or shrink.

 */

class LTIOMemStream : public LTIOStreamInf

{

public:

   LTIOMemStream();

   virtual ~LTIOMemStream();

   /** 

    * @name Initialization functions

    */

   /*@{*/

   /**

    * Initializes the stream

    *

    * @param   data  pointer to start of buffer

    * @param   size  size of buffer in bytes

    */

   virtual LT_STATUS initialize( void* data, lt_uint32 size );

   /**

    * Initializes the stream

    *

    * This version internally allocates a buffer of the specified size.

    * 

    * @param   size  size of buffer in bytes

    */

   virtual LT_STATUS initialize( lt_uint32 size );

   /*@}*/

        virtual bool isEOF();

        virtual bool isOpen();

        virtual LT_STATUS open();

        virtual LT_STATUS close();

   virtual lt_uint32 read( lt_uint8 *pDest, lt_uint32 numBytes );

   virtual lt_uint32 write( const lt_uint8 *pSrc, lt_uint32 numBytes );

   virtual LT_STATUS seek( lt_int64 offset, LTIOSeekDir origin );

   virtual lt_int64 tell();

        virtual LTIOStreamInf* duplicate();

        virtual LT_STATUS getLastError() const;

        virtual const char* getID() const;

protected:

   /**   pointer to buffer */

   lt_uint8*   m_data;

   /**   size of buffer */

   lt_uint32   m_size;

   /**   current position  */

   lt_uint32   m_cur;

   /**   data ownership */

   bool        m_ownsData;

   /**   openness */

   bool        m_isOpen;

   bool m_isEOF;

};

LT_END_NAMESPACE( LizardTech )

#endif        // LT_IO_MEM_STREAM_H