DbFileStorage.H

/* DbFileStorage.H */
/* $Id: DbFileStorage.H,v 1.4 2004/02/24 12:10:08 vlad Exp $ */
#ifndef __DbFileStorage_H
#define __DbFileStorage_H


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#include <sys/types.h>

#include <mix/wenv.h>
#include <mix/trans.h>

#include <ldb/DbTableTypes.H>


class DbFile
{
public:

  DbFile (int fd, size_t nFHdrSize, size_t nLineSize);

  DbFile (int fd, const DbFile& filstor);

  DbIndex   lines_count () const;

  size_t    file_size () const;

  void  load_lines (DbIndex line1, DbIndex line2, void* pBuf) const;

  DbIndex   save_lines (DbIndex& line1, DbIndex& line2, const void* pBuf);

  void  add_lines (DbIndex lines);

  void  del_lines (DbIndex lines);

  void  set_file_sizes (size_t nFHdrSize, size_t nLineSize);

private:

  int       fildes;

  size_t    fhdr_size, line_size;

  DbIndex   total_lines;

};


// @{

void    DbFileReadHdr (int fd, DbFileHeader* pHdr, ByteOrder& eBO);

void    DbFileReadDmnAttrs (int fd, ByteOrder eBO, unsigned nDmns,
                DbFileDomainAttr* pDmnAttrs);

DbIndex DbFileReadLines (int fd, ByteOrder bo, DbIndex line_cnt,
             DbTTDesc& tt, void* mem);


void    DbFileWriteHdr (int fd, const DbFileHeader* pHdr, ByteOrder eBO);

void    DbFileWriteDmnAttrs (int fd, ByteOrder eBO, unsigned nDmns,
                 const DbFileDomainAttr* pDmnAttrs);

DbIndex DbFileWriteLines (int fd, ByteOrder bo, DbIndex line_cnt,
              DbTTDesc& tt, void* mem);


void    DbTableTransLines (ByteOrder eSrcBO, ByteOrder eDstBO,
               int nLines, DbTTDesc& rTTD, void* pBuf);

// @}


#endif /* DbFileStorage.H */