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// mk4io.h --
// $Id$
// This is part of Metakit, the homepage is http://www.equi4.com/metakit/
/** @file
* Declaration of the file stream and strategy classes.
*/
#ifndef __MK4IO_H__
#define __MK4IO_H__
#include <stdio.h>
/////////////////////////////////////////////////////////////////////////////
/// A file stream can be used to serialize using the stdio library.
class c4_FileStream : public c4_Stream
{
public:
c4_FileStream (FILE* stream_, bool owned_ =false);
virtual ~c4_FileStream ();
virtual int Read(void* buffer_, int length_);
virtual bool Write(const void* buffer_, int length_);
FILE* _stream;
bool _owned;
};
/////////////////////////////////////////////////////////////////////////////
/// A file strategy encapsulates code dealing with all file I/O.
class c4_FileStrategy : public c4_Strategy
{
public:
/// Construct a new strategy object
c4_FileStrategy (FILE* file_ =0);
virtual ~c4_FileStrategy ();
/// True if we can do I/O with this object
virtual bool IsValid() const;
/// Open a data file by name
virtual bool DataOpen(const char* fileName_, int mode_);
/// Read a number of bytes
virtual int DataRead(t4_i32 pos_, void* buffer_, int length_);
/// Write a number of bytes, return true if successful
virtual void DataWrite(t4_i32 pos_, const void* buffer_, int length_);
/// Flush and truncate file
virtual void DataCommit(t4_i32 newSize_);
/// Support for memory-mapped files
virtual void ResetFileMapping();
/// Report total size of the datafile
virtual t4_i32 FileSize();
/// Return a good value to use as fresh generation counter
virtual t4_i32 FreshGeneration();
protected:
/// Pointer to file object
FILE* _file;
/// Pointer to same file object, if it must be deleted at end
FILE* _cleanup;
};
/////////////////////////////////////////////////////////////////////////////
#endif // __MK4IO_H__
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