source: lmdz_wrf/trunk/WRFV3/external/io_grib1/WGRIB/pds4.h @ 14

/* version 3.4 of grib headers  w. ebisuzaki */
/* this version is incomplete */
/* add center DWD    Helmut P. Frank */
/* 10/02 add center CPTEC */

#ifndef INT2
#define INT2(a,b)   ((1-(int) ((unsigned) (a & 0x80) >> 6)) * (int) (((a & 0x7f) << 8) + b))
#endif

#define PDS_Len1(pds)           (pds[0])
#define PDS_Len2(pds)           (pds[1])
#define PDS_Len3(pds)           (pds[2])
#define PDS_LEN(pds)            ((int) ((pds[0]<<16)+(pds[1]<<8)+pds[2]))
#define PDS_Vsn(pds)            (pds[3])
#define PDS_Center(pds)         (pds[4])
#define PDS_Model(pds)          (pds[5])
#define PDS_Grid(pds)           (pds[6])
#define PDS_HAS_GDS(pds)        ((pds[7] & 128) != 0)
#define PDS_HAS_BMS(pds)        ((pds[7] & 64) != 0)
#define PDS_PARAM(pds)          (pds[8])
#define PDS_L_TYPE(pds)         (pds[9])
#define PDS_LEVEL1(pds)         (pds[10])
#define PDS_LEVEL2(pds)         (pds[11])

#define PDS_KPDS5(pds)          (pds[8])
#define PDS_KPDS6(pds)          (pds[9])
#define PDS_KPDS7(pds)          ((int) ((pds[10]<<8) + pds[11]))

/* this requires a 32-bit default integer machine */
#define PDS_Field(pds)          ((pds[8]<<24)+(pds[9]<<16)+(pds[10]<<8)+pds[11])

#define PDS_Year(pds)           (pds[12])
#define PDS_Month(pds)          (pds[13])
#define PDS_Day(pds)            (pds[14])
#define PDS_Hour(pds)           (pds[15])
#define PDS_Minute(pds)         (pds[16])
#define PDS_ForecastTimeUnit(pds)       (pds[17])
#define PDS_P1(pds)             (pds[18])
#define PDS_P2(pds)             (pds[19])
#define PDS_TimeRange(pds)      (pds[20])
#define PDS_NumAve(pds)         ((int) ((pds[21]<<8)+pds[22]))
#define PDS_NumMissing(pds)     (pds[23])
#define PDS_Century(pds)        (pds[24])
#define PDS_Subcenter(pds)      (pds[25])
#define PDS_DecimalScale(pds)   INT2(pds[26],pds[27])
/* old #define PDS_Year4(pds)   (pds[12] + 100*(pds[24] - (pds[12] != 0))) */
#define PDS_Year4(pds)          (pds[12] + 100*(pds[24] - 1))

/* various centers */
#define NMC                     7
#define ECMWF                   98
#define DWD                     78
#define CMC                     54
#define CPTEC                   46

/* ECMWF Extensions */

#define PDS_EcLocalId(pds)      (PDS_LEN(pds) >= 41 ? (pds[40]) : 0)
#define PDS_EcClass(pds)        (PDS_LEN(pds) >= 42 ? (pds[41]) : 0)
#define PDS_EcType(pds)         (PDS_LEN(pds) >= 43 ? (pds[42]) : 0)
#define PDS_EcStream(pds)       (PDS_LEN(pds) >= 45 ? (INT2(pds[43], pds[44])) : 0)

#define PDS_EcENS(pds)          (PDS_LEN(pds) >= 52 && pds[40] == 1 && \
                                pds[43] * 256 + pds[44] == 1035 && pds[50] != 0)
#define PDS_EcFcstNo(pds)       (pds[50])
#define PDS_EcNoFcst(pds)       (pds[51])


/* NCEP Extensions */

#define PDS_NcepENS(pds)        (PDS_LEN(pds) >= 44 && pds[25] == 2 && pds[40] == 1)
#define PDS_NcepFcstType(pds)   (pds[41])
#define PDS_NcepFcstNo(pds)     (pds[42])
#define PDS_NcepFcstProd(pds)   (pds[43])

/* time units */

#define MINUTE  0
#define HOUR    1
#define DAY     2
#define MONTH   3
#define YEAR    4
#define DECADE  5
#define NORMAL  6
#define CENTURY 7
#define HOURS3  10
#define HOURS6  11
#define HOURS12  12
#define SECOND  254