/* Definition of Datalib and related types */

#ifndef MAX_NAME_LEN

#define MAX_NAME_LEN	80	/* max len of dir entry */

typedef long int FilePtr;	/* File pointer */
typedef Int4 FileLen;		/* Length field */

typedef struct {		/* Block descriptor; the block itself follows it */
  FilePtr Next;			/* Next Block in the chain */
  FileLen Len;			/* Length of the Block excluding its descriptor */
  FileLen DataLen;		/* Used for the last Block in a chain only */
} BlockDesc;

typedef struct _DataLib {
  FILE PNTR Stream;		/* Stream used to read/write the file */
  CharPtr FileName;		/* dynamic copy of DataLib file name */
  /* Low-level routines data */
  Int2 Flags;			/* internal flags */
  FilePtr CurBlockPtr;		/* Current position: Block and */
  FileLen CurOffset;		/*   offset in it */
  BlockDesc CurDesc;		/* The descriptor of the current Block */
  FilePtr PrevBlockPtr;		/* Previous Block pointer; used for overwriting */
  /* Middle-level routines data */
  FilePtr FirstDirPtr;		/* Pointer to the first entry of the current subdirectory */
  FilePtr CurDirPtr;		/* Pointer to the current entry of the current subdirectory */
  FilePtr ParentDirPtr;		/* Pointer to the parent entry of the current directory */
  Int2 PrevCurrent;		/* Ordinal number of previous current dir entry */
  Char DirName[MAX_NAME_LEN];	/* Name of the current directory entry */
#define NameFirstChar DirName[0]	/* First character of the dir entry Name */
  struct _DataLib PNTR Saved;	/* by DataLibSavePos; used by DataLibRestorePos */
  /* High-level routines data */
  WindoW Window;		/* DataLibShow window */
  LisT List;			/* DataLibShow list */
  Int2 MinDepth;		/* Depth is mesured from this value */
  Int2 Depth;			/* Depth of the current dir entry */
  FilePtr SelectedDirPtr;	/* Last Selected dir entry ptr */
} DataLib, PNTR DataLibPtr;

typedef struct {		/* DataLibTell/DataLibSeek */
  FilePtr BlockPtr;		/* Position: Block and */
  FileLen Offset;		/*   offset from its  beginning */ 
} DataLibPos, PNTR DataLibPosPtr;

#endif	/* MAX_NAME_LEN */