-- Transport Mechanism Filestore - DEFS for bit maps --
-- A.D.Birrell	December 14, 1978  11:10 AM --
-- Hankins,	 11-Jun-84 16:54:26	Klamath update (removing Bravo format chars)

BitMapDefs: DEFINITIONS =

  BEGIN
  MapLevel: TYPE = RECORD [
    level: CARDINAL, next: Map, data: DESCRIPTOR FOR ARRAY OF WORD];
  Map: TYPE = POINTER TO MapLevel;
  MapIndex: TYPE = CARDINAL;

  Set: PROCEDURE [Map, MapIndex];  -- sets bit 'on' --

  Test: PROCEDURE [Map, MapIndex] RETURNS [BOOLEAN];
  -- returns TRUE iff bit is 'on'

  Clear: PROCEDURE [Map, MapIndex];  -- sets the specified bit 'off'

  FindFree: PROCEDURE [Map] RETURNS [MapIndex];
  -- finds the first 'off' bit in the map, sets it 'on' (?) and returns its number --

  Create: PROCEDURE [CARDINAL] RETURNS [Map];
  -- allocates a map of specified size and sets all its bits off' --

  END.