text: /*
  **  ClanLib SDK
  **  Copyright (c) 1997-2010 The ClanLib Team
  **
  **  This software is provided 'as-is', without any express or implied
  **  warranty.  In no event will the authors be held liable for any damages
  **  arising from the use of this software.
  **
  **  Permission is granted to anyone to use this software for any purpose,
  **  including commercial applications, and to alter it and redistribute it
  **  freely, subject to the following restrictions:
  **
  **  1. The origin of this software must not be misrepresented; you must not
  **     claim that you wrote the original software. If you use this software
  **     in a product, an acknowledgment in the product documentation would be
  **     appreciated but is not required.
  **  2. Altered source versions must be plainly marked as such, and must not be
  **     misrepresented as being the original software.
  **  3. This notice may not be removed or altered from any source distribution.
  **
  **  Note: Some of the libraries ClanLib may link to may have additional
  **  requirements or restrictions.
  **
  **  File Author(s):
  **
  **    Magnus Norddahl
  */
  
  /// \addtogroup clanCore_I_O_Data clanCore I/O Data
  /// \{
  
  #pragma once
  
  #include "../api_core.h"
  #include "iodevice.h"
  
  /// \brief I/O device provider interface.
  ///
  /// \xmlonly !group=Core/IO Data! !header=core.h! \endxmlonly
  class CL_API_CORE CL_IODeviceProvider
  {
  /// \name Construction
  /// \{
  
  public:
  	virtual ~CL_IODeviceProvider() { return; }
  
  /// \}
  /// \name Attributes
  /// \{
  
  public:
  	/// \brief Returns the size of data stream.
  	/** <p>Returns -1 if the size is unknown.</p>*/
  	virtual int get_size() const { return -1; }
  
  	/// \brief Returns the position in the data stream.
  	/** <p>Returns -1 if the position is unknown.</p>*/
  	virtual int get_position() const { return -1; }
  
  /// \}
  /// \name Operations
  /// \{
  
  public:
  	/// \brief Send data to device.
  	virtual int send(const void *data, int len, bool send_all = true) = 0;
  
  	/// \brief Receive data from device.
  	virtual int receive(void *data, int len, bool receive_all = true) = 0;
  
  	/// \brief Peek data from device.
  	virtual int peek(void *data, int len) = 0;
  
  	/// \brief Returns a new provider to the same resource.
  	virtual CL_IODeviceProvider *duplicate() = 0;
  
  	/// \brief Seek in data stream.
  	virtual bool seek(int position, CL_IODevice::SeekMode mode) { return false; }
  
  /// \}
  /// \name Implementation
  /// \{
  
  private:
  /// \}
  };
  
  /// \}
  