void WriteFileHeader ();
void WriteBlock (uchar *block, uint num);
uchar *ReadBlock (uint num);
void WriteFileHeader ();
void WriteBlock (uchar *block, uint num);
uchar *ReadBlock (uint num);
void ReadNodoHeader (uchar *node, BTreeNodeHeader *header);
void WriteNodoHeader (uchar *node, BTreeNodeHeader *header);
void ReadNodoHeader (uchar *node, BTreeNodeHeader *header);
void WriteNodoHeader (uchar *node, BTreeNodeHeader *header);