;+
; @file_comments 
; 
; 
; @categories
; 
; 
; @param NUM 
;
;
; @param RECSTART
; 
;
; @returns
; 
; 
; @restrictions
; 
; 
; @examples
;
;
; @history
; 
;
; @version
; $Id$
;-
FUNCTION read_grib_pds, num, recstart
;
;
  compile_opt idl2, strictarrsubs
;
  offset = recstart+8
  a = assoc(num, bytarr(1, /nozero), offset-1)
;
  sizepds = bit2int([binary(a[1]), binary(a[2]), binary(a[3])])
 ; 
  paramtableversion = (a[4])[0]
 ; 
  centerid = (a[5])[0]
 ; 
  procid = (a[6])[0]
 ; 
  gridid = (a[7])[0]
;
  flag = binary(a[8])
  gdsnotomitted = flag[0]
  bmsnotomitted = flag[1]
;
  paramunitid = (a[9])[0]
;
  levtype = (a[10])[0]  
  levalue1 = (a[11])[0]
  levalue2 = (a[12])[0]
;
  year = (a[13])[0]
  month = (a[14])[0]
  day = (a[15])[0]
  hour = (a[16])[0]
  minute = (a[17])[0]
  timeunit = (a[18])[0]
  p1 = (a[19])[0]
  p2 = (a[20])[0]
  timerange = (a[21])[0]
  n1 = (a[22])[0]
  n2 = (a[23])[0]
  nbmiss = (a[24])[0]
  century = (a[25])[0]
;
  subcenterid = (a[26])[0]
;
  d =  bit2int([binary(a[27]), binary(a[28])], /checkneg)
;.........


  RETURN, {size:sizepds, gdsnotomitted:gdsnotomitted, bmsnotomitted:bmsnotomitted, d:d}
END