Procedure

   dafps_c ( DAF, pack summary ) 

   void dafps_c ( SpiceInt             nd,
                  SpiceInt             ni,
                  ConstSpiceDouble   * dc,
                  ConstSpiceInt      * ic,
                  SpiceDouble        * sum )

Abstract

   Pack (assemble) an array summary from its double precision and
   integer components.

Required_Reading

   DAF

Keywords

   CONVERSION
   FILES

Brief_I/O

   VARIABLE  I/O  DESCRIPTION
   --------  ---  --------------------------------------------------
   nd         I   Number of double precision components.
   ni         I   Number of integer components.
   dc         I   Double precision components.
   ic         I   Integer components.
   sum        O   Array summary.

Detailed_Input

   nd          is the number of double precision components in
               the summary to be packed.

   ni          is the number of integer components in the summary.

   dc          are the double precision components of the summary.

   ic          are the integer components of the summary.

Detailed_Output

   sum         is an array summary containing the components in `dc'
               and `ic'. This identifies the contents and location of
               a single array within a DAF.

Parameters

   None.

Exceptions

   Error free.

   1)  If `nd' is zero or negative, no DP components are stored.

   2)  If `ni' is zero or negative, no integer components are stored.

   3)  If the total size of the summary is greater than 125 double
       precision words, some components may not be stored. See
       -Particulars for details.

Files

   None.

Particulars

   The components of array summaries are packed into double
   precision arrays for reasons outlined in the DAF required reading.
   Two routines, dafps_c (pack summary) and dafus_c (unpack summary)
   are provided for packing and unpacking summaries.

   The total size of the summary is

           (NI - 1)
      ND + -------- + 1
               2

   double precision words (where the sizes of `dc' and `ic', ND and NI,
   are non-negative).

Examples

   The numerical results shown for this example may differ across
   platforms. The results depend on the SPICE kernels used as
   input, the compiler and supporting libraries, and the machine
   specific arithmetic implementation.

   1) Replace the body ID code 301 (Moon) with a test body ID,
      e.g. -999, in every descriptor of an SPK file.


      Example code begins here.


      /.
         Program dafps_ex1
      ./
      #include <stdio.h>
      #include "SpiceUsr.h"

      int main ( )
      {
         /.
         Local parameters.
         ./
         #define DSCSIZ          5
         #define FILSIZ          256
         #define MAXOBJ         1000

         #define ND              2
         #define NI              6

         #define NEWCODE         ( -999 )
         #define OLDCODE         (  301 )

         /.
         Local variables.
         ./
         SPICEINT_CELL         ( ids,   MAXOBJ );

         SpiceBoolean            found;

         SpiceChar               fname   [ FILSIZ ];

         SpiceDouble             dc      [ ND ];
         SpiceDouble             sum     [ DSCSIZ ];

         SpiceInt                handle;
         SpiceInt                i;
         SpiceInt                ic      [ NI ];
         SpiceInt                obj;

         /.
         Get the SPK file name.
         ./
         prompt_c ( "Enter name of the SPK file > ", FILSIZ, fname );

         /.
         Open for writing the SPK file.
         ./
         dafopw_c ( fname, &handle );

         /.
         Search the file in forward order.
         ./
         dafbfs_c ( handle );
         daffna_c ( &found );

         while ( found )
         {
            /.
            Fetch and unpack the descriptor (aka summary)
            of the current segment.
            ./
            dafgs_c ( sum  );
            dafus_c ( sum, ND, NI, dc, ic );

            /.
            Replace ID codes if necessary.
            ./
            if ( ic[0] == OLDCODE )
            {
               ic[0] = NEWCODE;
            }
            if ( ic[1] == OLDCODE )
            {
               ic[1] = NEWCODE;
            }

            /.
            Re-pack the descriptor; replace the descriptor
            in the file.
            ./
            dafps_c ( ND, NI, dc, ic, sum );
            dafrs_c ( sum );

            /.
            Find the next segment.
            ./
            daffna_c ( &found );

         }

         /.
         Close the file.
         ./
         dafcls_c ( handle );

         /.
         Find the set of objects in the SPK file.
         ./
         spkobj_c ( fname, &ids );

         printf( "Objects in the DAF file:\n\n" );

         for ( i = 0;  i < card_c( &ids );  i++  )
         {
            obj  =  SPICE_CELL_ELEM_I( &ids, i );
            printf( "%4d", (int)obj );
         }

         printf( "\n" );

         return ( 0 );
      }


      When this program was executed on a Mac/Intel/cc/64-bit
      platform, using the SPK file named de430.bsp, the output was:


      Enter name of the SPK file > de430.bsp
      Objects in the DAF file:

      -999   1   2   3   4   5   6   7   8   9  10 199 299 399

Restrictions

   None.

Literature_References

   None.

Author_and_Institution

   N.J. Bachman        (JPL)
   J. Diaz del Rio     (ODC Space)

Version

   -CSPICE Version 1.0.1, 09-JUL-2021 (JDR)

       Edited the header to comply with NAIF standard. Extended code
       example to generate outputs and provided example's solution.

   -CSPICE Version 1.0.0, 23-NOV-2004 (NJB)

Index_Entries

   pack DAF summary