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67 lines
1.8 KiB
67 lines
1.8 KiB
/* aKode: MMapFile-type
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Copyright (C) 2004 Allan Sandfeld Jensen <kde@carewolf.com>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#ifndef _AKODE_MMAPFILE_H
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#define _AKODE_MMAPFILE_H
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#include "file.h"
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#include "akode_export.h"
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namespace aKode {
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//! An implementation of the File interface that uses mmap
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/*!
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* MMapFile uses the mmap system-call for file-access.
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* This is often faster than ordinary file-access. In return
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* MMapFile does not provide writing capabilities.
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*/
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class AKODE_EXPORT MMapFile : public File {
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int fd;
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void* handle;
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long len;
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long pos;
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public:
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MMapFile(const char* filename);
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virtual ~MMapFile();
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bool openRO();
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void close();
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long read(char* ptr, long num);
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long write(const char*, long);
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ssize_t lseek(long to, int whence = SEEK_SET);
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long position() const;
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long length() const;
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bool seekable() const { return true; };
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bool readable() const { return true; };
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bool writeable() const { return false; };
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bool eof() const;
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bool error() const;
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void fadvise();
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};
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} //namespace
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#endif
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