xbblkread.h

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/*  xbblkread.h
 
XBase64 Software Library
 
Copyright (c) 1997,2003,2014,2022 Gary A Kunkel
 
The xb64 software library is covered under the terms of the GPL Version 3, 2007 license.
 
Email Contact:
 
    XDB-devel@lists.sourceforge.net
    XDB-users@lists.sourceforge.net
 
*/
 
#ifndef __XB_BLKREAD_H__
#define __XB_BLKREAD_H__
 
namespace xb{
#ifdef XB_BLOCKREAD_SUPPORT
 
 
 
 
class XBDLLEXPORT xbBlockRead {
 
  public:
    xbBlockRead( xbDbf * d );
    ~xbBlockRead();
 
    #ifdef XB_DEBUG_SUPPORT
    void     DumpReadBlockInternals();
    #endif
 
    xbInt16  Init( xbUInt32 ulBlkSize = 0 );
 
    xbUInt32 GetBlockFirstRecNo() const;
    xbUInt32 GetBlockRecCnt() const;
    xbUInt32 GetBlockSize() const;
 
    xbInt16  GetRecord( xbUInt32 ulRecNo );            // retrieve a data record from a block to RecBuf
    xbInt16  SetBlockSize( xbUInt32 ulBlkSize );
 
 
  private:
 
    xbInt16  GetBlockForRecNo( xbUInt32 ulRecNo );    // retrieve block from disk for a given record number
 
    char     *pBlock;             // block pointer
    xbUInt32 ulBlkSize;           // block size in bytes
    xbUInt32 ulFirstBlkRec;       // first recod number in the block
    xbUInt32 ulRecCnt;            // number of records in block
    xbUInt32 ulMaxRecs;           // max number of records block can handle
    xbBool   bEof;                // EOF flag
    xbDbf    *dbf;                // reference to associated dbf file
//    xbXBase  *xbase;              // reference to main xbXBase structure
    time_t   tFmTime;             // file modify time at time of block read
 
};
 
#endif // XB_BLOCKREAD
}  /* namespace */
#endif  /*  __XB_BLOCKREAD_H__  */