external/io_grib1/WGRIB/bms.h

   1 /* version 1.2 of grib headers  w. ebisuzaki */
   2
   3 #define BMS_LEN(bms)            ((bms) == NULL ? 0 : (bms[0]<<16)+(bms[1]<<8)+bms[2])
   4 #define BMS_UnusedBits(bms)     ((bms) == NULL ? 0 : bms[3])
   5 #define BMS_StdMap(bms)         ((bms) == NULL ? 0 : ((bms[4]<<8) + bms[5]))
   6 #define BMS_bitmap(bms)         ((bms) == NULL ? NULL : (bms)+6)
   7 #define BMS_nxny(bms)           ((((bms) == NULL) || BMS_StdMap(bms)) \
   8         ? 0 : (BMS_LEN(bms)*8 - 48 - BMS_UnusedBits(bms)))