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/* aKode: MMapFile-type
Copyright (C) 2004 Allan Sandfeld Jensen <kde@carewolf.com>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#ifndef _AKODE_MMAPFILE_H
#define _AKODE_MMAPFILE_H
#include "file.h"
#include "akode_export.h"
namespace aKode {
//! An implementation of the File interface that uses mmap
/*!
* MMapFile uses the mmap system-call for file-access.
* This is often faster than ordinary file-access. In return
* MMapFile does not provide writing capabilities.
*/
class AKODE_EXPORT MMapFile : public File {
int fd;
void* handle;
long len;
long pos;
public:
MMapFile(const char* filename);
virtual ~MMapFile();
bool openRO();
void close();
long read(char* ptr, long num);
long write(const char*, long);
bool seek(long to, int whence = SEEK_SET);
long position() const;
long length() const;
bool seekable() const { return true; };
bool readable() const { return true; };
bool writeable() const { return false; };
bool eof() const;
bool error() const;
void fadvise();
};
} //namespace
#endif
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