grib.h

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   unsigned short   usProj_flag;         /* Projection center flag */
   unsigned short   usScan_mode;         /* Scan mode */
   unsigned short   usZero;              /* Reserved (set to 0) */
} GDS_PS_INPUT;

typedef struct mercator  /*  mercator grids */
   {
   unsigned short   usData_type;     /* Data representation type ( Table 6)    */
   int cols;               /* Ni - Number of points along a latitude circle */
   int rows;               /* Nj - Number of points along a longitude meridian */
   long first_lat;         /* La1 - Latitude of first grid point */
   long first_lon;         /* Lo1 - Longitude of first grid point */
   unsigned short   usRes_flag;  /* Resolution and component flag (Table 7)*/
   long La2;               /* latitude of last grid point, or # point / row */
   long Lo2;               /* longitude of last grid point, or # point / column */
   long latin;             /* Latin - the latitude at which the mercator 
                                      projection intersects the earth */
   unsigned short   usZero1;   /* Reserved (set to 0)                    */
   unsigned short   usScan_mode; /* Scanning mode (Table 8)                */
   float lon_inc;       /* Di - the longitudinal direction increment 
                           (west to east) */
   float lat_inc;       /* Dj - the latitudinal direction increment 
                           (south to north) */
   long             usZero;              /* Reserved (set to 0)                    */
 }mercator;

typedef struct BDS_HEAD_INPUT {          /* BDS Header Input                */
   unsigned long    length;              /* BDS Length */
   unsigned short   usBDS_flag;          /* BDS flag (Table 11)                    */
   int              Bin_sc_fctr;         /* Binary scale factor                    */
   float            fReference;          /* Reference value (minimum value)        */
   unsigned short   usBit_pack_num;      /* Number of bits into which data is packed*/
   unsigned long    ulGrid_size;         /* Number of grid points                  */
   float            fPack_null;          /* Pack_null value for packing data       */
}BDS_HEAD_INPUT;

typedef struct GDS_HEAD_INPUT {        /* internal GDS Header Input */
   unsigned short   usNum_v;             /* Number of vertical cords   */
   unsigned short   usPl_Pv;             /* PV or PL location  */
   unsigned short   usData_type;         /* Data representation type (Table 6)     */
   unsigned short   uslength;            /* GDS Length - depends on projection */
}GDS_HEAD_INPUT;

typedef struct IDS_GRIB {              /* IDS -Indicator Section 0               */
   unsigned char   szId[4];              /* "GRIB" Identifier                      */
   unsigned char   achTtl_length[3];     /* Total length of GRIB msg               */
   unsigned char   chEd_num;             /* GRIB Edition number  - #1              */
} IDS_GRIB;

typedef struct PDS_GRIB {              /* PDS -Product Definition Section 1       */
   unsigned char    achPDS_length[3];    /* Section length (in octets)             */
   unsigned char    chParm_tbl;          /* Parameter table number (1)             */
   unsigned char    chCenter_id;         /* Id of originating center (Table 0)     */
   unsigned char    chProc_id;           /* Generating process Id number (Table A) */
   unsigned char    chGrid_id;           /* Grid Identification (Table B)          */
   unsigned char    chGds_bms_id;        /* GDS and BMS flag (Table 1)             */
   unsigned char    chParm_id;           /* Parameter and unit id (Table 2)        */
   unsigned char    chLevel_id;          /* Type of level or layer id (Table 3/3a) */
   unsigned char    achHeight[2];        /* Height, pressure,etc of level (Table 3)*/
   unsigned char    chYear;              /* Year of century     -Initial or ref.   */
   unsigned char    chMonth;             /* Month of year       -time of forecast  */
   unsigned char    chDay;               /* Day of month                           */
   unsigned char    chHour;              /* Hour of day                            */
   unsigned char    chMinute;            /* Minute of hour                         */
   unsigned char    chFcst_unit_id;      /* Forecast time unit (Table 4)           */
   unsigned char    chP1;                /* Period of time (Number of time units)  */
   unsigned char    chP2;                /* Time interval between forecasts        */
   unsigned char    chTime_range;        /* Time range indicator (Table 5)         */
   unsigned char    achTime_range_avg[2]; /* Number included in average if flag set */
   unsigned char    chTime_range_mis;    /* Number missing from average            */
   unsigned char    chCentury;           /* Centry of Initial time (19)            */
   unsigned char    chCenter_sub;        /* Oct-26: Sub Center Id  */
   unsigned char    achDec_sc_fctr[2];   /* Decimal scale factor                   */
   unsigned char    achZero[12];         /* Reserved                               */
   unsigned char    chExt_flag;          /* Oct-41: Grib extensions usage flag*/
   unsigned char    chSecond;            /* Second of Minute                       */
   unsigned char    chTrack_num[2];         /* Tracking ID for data set               */
   unsigned char    chParm_sub;          /* Sub-Table Entry for parameter and unit (Table 2) */
   unsigned char    chSub_tbl;           /* Sub-Table Version number */
} PDS_GRIB;

typedef struct GDS_HEAD {              /* GDS header                              */
   unsigned char    achGDS_length[3];    /* Section length (in octets)             */
   unsigned char    chNV;                /* # of vertical coord. parameters (not used)*/
   unsigned char    chPV;                /* Location of vert. coord., 255 if none  */ 
   unsigned char    chData_type;         /* Data representation type (Table 6)     */
} GDS_HEAD;

typedef struct LAMBERT {               /* Lambert Conformal Grid                  */
   unsigned char    achNx[2];                /* Nx - # of points along x-axis          */
   unsigned char    achNy[2];                /* Ny - # of points along y-axis          */
   unsigned char    achLat1[3];          /* Latitude of first grid point           */
   unsigned char    achLon1[3];          /* Longitude of first grid point          */
   unsigned char    chRes_flag;          /* Resolution and component flag (Table 7)*/
   unsigned char    achLon_orient[3];    /* Orientaion of grid - longitude         */
   unsigned char    achDx[3];            /* X-direction grid length                */
   unsigned char    achDy[3];            /* Y-direction grid length                */
   unsigned char    chProj_flag;         /* Projection center flag                 */
   unsigned char    chScan_mode;         /* Scan mode                              */
   unsigned char    achLat_cut1[3];      /* First latitude which secant cone cuts  */
   unsigned char    achLat_cut2[3];      /* Second latitude from pole              */
   unsigned char    achLat_southpole[3]; /* Latitude of southern pole (millidegree)*/
   unsigned char    achLon_southpole[3]; /* Longitude of southern pole             */
   unsigned char    achZero[2];              /* Reserved (set to 0)                    */
} LAMBERT;

typedef struct POLAR {                   /* Polar Stereographic Grid */
   unsigned char    achNx[2];            /* Nx - # of points along x-axis */
   unsigned char    achNy[2];            /* Ny - # of points along y-ayis */
   unsigned char    achLat1[3];          /* Latitude of first grid point */
   unsigned char    achLon1[3];          /* Longitude of first grid point */
   unsigned char    chRes_flag;          /* Resolution and component flag (Table 7) */
   unsigned char    achLon_orient[3];    /* Orientaion of grid - longitude */
   unsigned char    achDx[3];            /* X-direction grid length */
   unsigned char    achDy[3];            /* Y-direction grid length */
   unsigned char    chProj_flag;         /* Projection center flag */
   unsigned char    chScan_mode;         /* Scan mode */
   unsigned char    achZero[4];          /* Reserved (set to 0) */
} POLAR;

typedef struct LATLON {                  /* Input: Latitude/Longitude Grid          */
   unsigned char    achNi[2];            /* Number of points along a parallel      */
   unsigned char    achNj[2] ;           /* Number of points along a meridian      */
   unsigned char    achLat1[3];          /* Latitude of first grid point           */
   unsigned char    achLon1[3];          /* Longitude of first grid point          */
   unsigned char    chRes_flag;          /* Resolution and component flag (Table 7)*/
   unsigned char    achLat2[3];          /* Latitude of last grid point            */
   unsigned char    achLon2[3];          /* Longitude of last grid point           */
   unsigned char    achDi[2];             /* I-direction increment                  */
   unsigned char    achDj[2];             /* J-direction increment                  */
   unsigned char    chScan_mode;         /* Scanning mode (Table 8)                */
   unsigned char    achZero[4];              /* Reserved (set to 0)                    */
   unsigned char    achLat_southpole[3]; /* Latitude of southern pole (millidegree)*/
   unsigned char    achLon_southpole[3]; /* Longitude of southern pole             */
   unsigned char    achRotate[4];        /* Angle of rotation                      */
   unsigned char    achPole_lat[3];      /* Latitude of pole of stretching (millidegree) */
   unsigned char    achPole_lon[3];      /* Longitude of pole of stretching        */
   unsigned char    achStretch[4];       /* Stretching factor                      */
} LATLON;

typedef struct BDS_HEAD {                /* Binary Data Section 4                     */
   unsigned char    achBDS_length[3];    /* Section length                         */
   unsigned char    chBDS_flag;          /* Flag (Table 11)                        */
   unsigned char    achBin_sc_fctr[2];   /* Binary Scale Factor                    */
   unsigned char    achReference[4];     /* Reference value (minimum value)IBM format*/
   unsigned char    chBit_pack_num;      /* Number of bits into which data is packed*/
} BDS_HEAD;

typedef struct EDS_GRIB {                /* End Section 5                           */
   unsigned char    szEDS_id[4];         /* "7777" Ascii characters                */
} EDS_GRIB;

typedef struct grid_desc_sec     /* Grid Description Section */
{
   struct GDS_HEAD_INPUT   head;     /* GDS Header section - common to all */
   struct GDS_LATLON_INPUT llg;      /* Latitude/Longitude or Gaussian grids */
   struct GDS_LAM_INPUT    lam;      /* lambert conformal grids */
   struct GDS_PS_INPUT     pol;      /* polar stereographic grids */
   struct mercator         merc;         /* mercator grids */
}grid_desc_sec;

typedef struct BMS_GRIB 		/* Bit Map Section 3 			*/
{
  unsigned char	 achBMS_length[3];	/* Section length			*/
  unsigned char	 chUnused_bits;		/* #unused bits in bitmap stream	*/
  unsigned char  achBMS_id[2];		/* 0 or a predefined bitmap id		*/
} BMS_GRIB;

typedef struct BMS_INPUT	/* User Input structure - BMS */
{
  unsigned short uslength;	/* section length */
  unsigned short usUnused_bits;	/* number of Unused bits */
  unsigned short usBMS_id;	/* 0 or a predefined id  */
  unsigned long  ulbits_set;	/* num of datapts present */
  char		*bit_map;	/* pts to beg. of BM bstream */
} BMS_INPUT;