binary_i_memory_map.h

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/** @file
 *  @author Bram de Greve (bramz@users.sourceforge.net)
 *  @author Tom De Muer (tomdemuer@users.sourceforge.net)
 *
 *  *** BEGIN LICENSE INFORMATION ***
 *  
 *  The contents of this file are subject to the Common Public Attribution License 
 *  Version 1.0 (the "License"); you may not use this file except in compliance with 
 *  the License. You may obtain a copy of the License at 
 *  http://lass.sourceforge.net/cpal-license. The License is based on the 
 *  Mozilla Public License Version 1.1 but Sections 14 and 15 have been added to cover 
 *  use of software over a computer network and provide for limited attribution for 
 *  the Original Developer. In addition, Exhibit A has been modified to be consistent 
 *  with Exhibit B.
 *  
 *  Software distributed under the License is distributed on an "AS IS" basis, WITHOUT 
 *  WARRANTY OF ANY KIND, either express or implied. See the License for the specific 
 *  language governing rights and limitations under the License.
 *  
 *  The Original Code is LASS - Library of Assembled Shared Sources.
 *  
 *  The Initial Developer of the Original Code is Bram de Greve and Tom De Muer.
 *  The Original Developer is the Initial Developer.
 *  
 *  All portions of the code written by the Initial Developer are:
 *  Copyright (C) 2004-2007 the Initial Developer.
 *  All Rights Reserved.
 *  
 *  Contributor(s):
 *
 *  Alternatively, the contents of this file may be used under the terms of the 
 *  GNU General Public License Version 2 or later (the GPL), in which case the 
 *  provisions of GPL are applicable instead of those above.  If you wish to allow use
 *  of your version of this file only under the terms of the GPL and not to allow 
 *  others to use your version of this file under the CPAL, indicate your decision by 
 *  deleting the provisions above and replace them with the notice and other 
 *  provisions required by the GPL License. If you do not delete the provisions above,
 *  a recipient may use your version of this file under either the CPAL or the GPL.
 *  
 *  *** END LICENSE INFORMATION ***
 */

/** @class lass::io::BinaryIMemoryMap
 *  @brief Input Stream for files using memory mapping
 */

#ifndef LASS_GUARDIAN_OF_INCLUSION_IO_BINARY_I_MEMORY_MAP_H
#define LASS_GUARDIAN_OF_INCLUSION_IO_BINARY_I_MEMORY_MAP_H

#include "io_common.h"
#include "binary_i_stream.h"

namespace lass
{
namespace io
{
namespace impl
{
    class BinaryIMemoryMapImpl;
}

class LASS_DLL BinaryIMemoryMap: public BinaryIStream
{
public:

    BinaryIMemoryMap();
    BinaryIMemoryMap(const char* filename);
    BinaryIMemoryMap(const std::string& filename);
    ~BinaryIMemoryMap();

    void open(const char* filename);
    void open(const std::string& filename);
    void close();
    bool is_open() const;

private:

    long doTellg() const;
    void doSeekg(long offset, std::ios_base::seekdir direction);
    void doRead(void* output, size_t numberOfBytes);

    impl::BinaryIMemoryMapImpl* pimpl_;
    char* data_;
    long begin_;
    long end_;
    long size_;
    long position_;
};



}

}

#endif