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

** libebml : parse EBML files, see http://embl.sourceforge.net/

**

** <file/class description>

**

** Copyright (C) 2014 Moritz Bunkus.  All rights reserved.

**

** This library is free software; you can redistribute it and/or

** modify it under the terms of the GNU Lesser General Public

** License as published by the Free Software Foundation; either

** version 2.1 of the License, or (at your option) any later version.

**

** This library is distributed in the hope that it will be useful,

** but WITHOUT ANY WARRANTY; without even the implied warranty of

** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

** Lesser General Public License for more details.

**

** You should have received a copy of the GNU Lesser General Public

** License along with this library; if not, write to the Free Software

** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

**

** See http://www.matroska.org/license/lgpl/ for LGPL licensing information.

**

** Contact license@matroska.org if any conditions of this licensing are

** not clear to you.

**

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

/*!

  \file

  \author Moritz Bunkus <moritz@bunkus.org>

*/

#ifndef LIBEBML_MEMREADIOCALLBACK_H

#define LIBEBML_MEMREADIOCALLBACK_H

#include "EbmlBinary.h"

#include "IOCallback.h"

namespace libebml {

class EBML_DLL_API MemReadIOCallback : public IOCallback {

protected:

  uint8 const *mStart, *mEnd, *mPtr;

public:

  MemReadIOCallback(void const *Ptr, size_t Size);

  MemReadIOCallback(EbmlBinary const &Binary);

  MemReadIOCallback(MemReadIOCallback const &Mem);

  ~MemReadIOCallback() override = default;

  uint32 read(void *Buffer, size_t Size) override;

  void setFilePointer(int64 Offset, seek_mode Mode = seek_beginning) override;

  size_t write(void const *, size_t) override { return 0; }

  uint64 getFilePointer() override { return mPtr - mStart; }

  void close() override {}

  binary const *GetDataBuffer() const { return mPtr; }

  uint64 GetDataBufferSize() const { return mEnd - mStart; }

protected:

  void Init(void const *Ptr, size_t Size);

};

} // namespace libebml

#endif // LIBEBML_MEMREADIOCALLBACK_H