/*
* This file is part of rasdaman community.
*
* Rasdaman community is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Rasdaman community 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with rasdaman community.  If not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2003, 2004, 2005, 2006, 2007, 2008, 2009 Peter Baumann /
rasdaman GmbH.
*
* For more information please see <http://www.rasdaman.org>
* or contact Peter Baumann via <baumann@rasdaman.com>.
*/

#ifndef _ECWMEMFS_HH_
#define _ECWMEMFS_HH_

#include "raslib/mddtypes.hh"

class MemoryFileSystem
	{
	public:
		enum m_Error
			{
			No_Error = 0,
			Error = 1
			};

		MemoryFileSystem();

		///open file an read into memory - completely
		m_Error open(const char* fileName);

		///use this memory chunk with mSize bytes length
		m_Error open(const char* memorySource, r_Bytes mSize);

		///close and deinitialise (delete only my own data)
		m_Error close();

		///call close
		~MemoryFileSystem();

		///read bSize bytes into buffer, only if bSize bytes are available
		m_Error read(void* buffer, r_Bytes bSize);

		///get current position
		unsigned long long tell();

		///go to offset bytes from begining of memory
		m_Error seek(unsigned long long offset);

		///if you use open(const* char) and the pointer is memorySrcName then no file will be read but this pointer
		static const char* memorySrc;

		///file names which point to this will not read from file system but from memorySrc
		static const char* memorySrcName;

		///the length of the memorySrc chunk must be specified in memoryLength
		static r_Bytes memorySrcLength;

	private:

		///my memory block
		char* source;
		///my current position
		char* current;
		///am i closed
		bool closed;
		///do i own my memory data
		bool owner;
		///how long is my memory data
		r_Bytes length;
	};

#endif