stream_cgribex.c 62.5 KB
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#if defined (HAVE_CONFIG_H)
#  include "config.h"
#endif

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#include <limits.h>
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#include <stdio.h>

#include "dmemory.h"
#include "cdi.h"
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#include "cdi_int.h"
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#include "file.h"
#include "varscan.h"
#include "datetime.h"
#include "vlist.h"
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#include "stream_grb.h"
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#include "stream_cgribex.h"
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#if  defined  (HAVE_LIBCGRIBEX)
#  include "cgribex.h"
#endif
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typedef struct {
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  int param;
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  int level1;
  int level2;
  int ltype;
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  int tsteptype;
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} compvar_t;
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#if  defined  (HAVE_LIBCGRIBEX)
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static
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int cgribexGetGridType(int *isec2)
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{
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  int gridtype = GRID_GENERIC;
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  switch (ISEC2_GridType)
    {
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    case  GRIB1_GTYPE_LATLON:     { gridtype = GRID_LONLAT;     break; }
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    case  GRIB1_GTYPE_LATLON_ROT: { gridtype = GRID_PROJECTION; break; }
    case  GRIB1_GTYPE_LCC:        { gridtype = GRID_LCC;        break; }
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    case  GRIB1_GTYPE_GAUSSIAN:   { gridtype = ISEC2_Reduced ? GRID_GAUSSIAN_REDUCED : GRID_GAUSSIAN; break; }
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    case  GRIB1_GTYPE_SPECTRAL:   { gridtype = GRID_SPECTRAL;   break; }
    case  GRIB1_GTYPE_GME:        { gridtype = GRID_GME;        break; }
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    }

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  return gridtype;
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}

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static
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bool cgribexGetIsRotated(int *isec2)
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{
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  return (ISEC2_GridType == GRIB1_GTYPE_LATLON_ROT);
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}

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static
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int cgribexGetZaxisHasBounds(int grb_ltype)
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{
  int lbounds = 0;

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  switch (grb_ltype)
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    {
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    case GRIB1_LTYPE_SIGMA_LAYER:
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    case GRIB1_LTYPE_HYBRID_LAYER:
    case GRIB1_LTYPE_LANDDEPTH_LAYER:
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      {
	lbounds = 1;
	break;
      }
    }

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  return lbounds;
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}

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static
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int cgribexGetTimeUnit(int *isec1)
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{
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  int timeunit = TUNIT_HOUR;
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  static bool lprint = true;
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  switch ( ISEC1_TimeUnit )
    {
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    case ISEC1_TABLE4_MINUTE:    timeunit = TUNIT_MINUTE;    break;
    case ISEC1_TABLE4_QUARTER:   timeunit = TUNIT_QUARTER;   break;
    case ISEC1_TABLE4_30MINUTES: timeunit = TUNIT_30MINUTES; break;
    case ISEC1_TABLE4_HOUR:      timeunit = TUNIT_HOUR;      break;
    case ISEC1_TABLE4_3HOURS:    timeunit = TUNIT_3HOURS;    break;
    case ISEC1_TABLE4_6HOURS:    timeunit = TUNIT_6HOURS;    break;
    case ISEC1_TABLE4_12HOURS:   timeunit = TUNIT_12HOURS;   break;
    case ISEC1_TABLE4_DAY:       timeunit = TUNIT_DAY;       break;
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    default:
      if ( lprint )
	{
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	  Message("GRIB time unit %d unsupported!", ISEC1_TimeUnit);
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	  lprint = false;
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	}
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      break;
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    }

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  return timeunit;
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}

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static
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bool cgribexTimeIsFC(int *isec1)
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{
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  bool isFC = (ISEC1_TimeRange == 10 && ISEC1_TimePeriod1 == 0 && ISEC1_TimePeriod2 == 0) ? false : true;
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  return isFC;
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}

static
int cgribexGetTsteptype(int timerange)
{
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  static bool lprint = true;
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  int tsteptype = TSTEP_INSTANT;
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  switch ( timerange )
    {
    case  0:  tsteptype = TSTEP_INSTANT;  break;
    case  1:  tsteptype = TSTEP_INSTANT2; break;
    case  2:  tsteptype = TSTEP_RANGE;    break;
    case  3:  tsteptype = TSTEP_AVG;      break;
    case  4:  tsteptype = TSTEP_ACCUM;    break;
    case  5:  tsteptype = TSTEP_DIFF;     break;
    case 10:  tsteptype = TSTEP_INSTANT3; break;
    default:
      if ( lprint )
	{
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	  Message("Time range indicator %d unsupported, set to 0!", timerange);
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	  lprint = false;
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	}
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      break;
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    }

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  return tsteptype;
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}

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static
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void cgribexGetGrid(stream_t *streamptr, int *isec2, int *isec4, grid_t *grid, int iret)
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{
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  bool compyinc = true;
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  int gridtype = cgribexGetGridType(isec2);
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  int projtype = (gridtype == GRID_PROJECTION && cgribexGetIsRotated(isec2)) ? CDI_PROJ_RLL : CDI_UNDEFID;
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  if ( gridtype == GRID_LCC )
    {
      gridtype = GRID_PROJECTION;
      projtype = CDI_PROJ_LCC;
    }
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  if ( streamptr->unreduced && gridtype == GRID_GAUSSIAN_REDUCED && iret != -801 )
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    {
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      int nlon = 0;
      for ( int ilat = 0; ilat < ISEC2_NumLat; ++ilat )
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        if ( ISEC2_RowLon(ilat) > nlon ) nlon = ISEC2_RowLon(ilat);
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      gridtype = GRID_GAUSSIAN;
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      ISEC2_NumLon = nlon;
      ISEC4_NumValues = nlon*ISEC2_NumLat;
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      compyinc = false;
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    }

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  grid_init(grid);
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  cdiGridTypeInit(grid, gridtype, 0);
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  if ( gridtype == GRID_LONLAT || gridtype == GRID_GAUSSIAN || projtype == CDI_PROJ_RLL )
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    {
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      bool ijDirectionIncrementGiven = gribbyte_get_bit(ISEC2_ResFlag, 1);
      bool uvRelativeToGrid = gribbyte_get_bit(ISEC2_ResFlag, 5);

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      if ( uvRelativeToGrid ) grid->uvRelativeToGrid = 1;
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      if ( ISEC4_NumValues != ISEC2_NumLon*ISEC2_NumLat )
        Error("numberOfPoints (%d) and gridSize (%d) differ!", ISEC4_NumValues, ISEC2_NumLon*ISEC2_NumLat);
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      grid->size   = ISEC4_NumValues;
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      grid->x.size = ISEC2_NumLon;
      grid->y.size = ISEC2_NumLat;
      if ( gridtype == GRID_GAUSSIAN ) grid->np = ISEC2_NumPar;
      grid->x.inc  = 0;
      grid->y.inc  = 0;
      grid->x.flag = 0;
      /* if ( ISEC2_FirstLon != 0 || ISEC2_LastLon != 0 ) */
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      {
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        if ( grid->x.size > 1 )
          {
            bool recompinc = true;
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            if ( ISEC2_LastLon < ISEC2_FirstLon && ISEC2_LastLon < 0 ) ISEC2_LastLon += 360000;

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            if ( ijDirectionIncrementGiven && ISEC2_LonIncr > 0 )
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              {
                if ( abs(ISEC2_LastLon - (ISEC2_FirstLon+ISEC2_LonIncr*(grid->x.size-1))) <= 2 )
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                  {
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                    recompinc = false;
                    grid->x.inc = ISEC2_LonIncr * 0.001;
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                  }
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              }
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            /* recompute xinc if necessary */
            if ( recompinc ) grid->x.inc = (ISEC2_LastLon - ISEC2_FirstLon) * 0.001 / (grid->x.size-1);
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            /* correct xinc if necessary */
            if ( ISEC2_FirstLon == 0 && ISEC2_LastLon > 354000 && ISEC2_LastLon < 360000 )
              {
                double xinc = 360. / grid->x.size;
                if ( fabs(grid->x.inc-xinc) > 0.0 )
                  {
                    grid->x.inc = xinc;
                    if ( CDI_Debug ) Message("set xinc to %g", grid->x.inc);
                  }
              }
          }
        grid->x.first = ISEC2_FirstLon * 0.001;
        grid->x.last  = ISEC2_LastLon  * 0.001;
        grid->x.flag  = 2;
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      }
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      grid->y.flag = 0;
      /* if ( ISEC2_FirstLat != 0 || ISEC2_LastLat != 0 ) */
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      {
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        if ( grid->y.size > 1 && compyinc )
          {
            bool recompinc = true;
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            if ( ijDirectionIncrementGiven && ISEC2_LatIncr > 0 )
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              {
                if ( abs(ISEC2_LastLat - (ISEC2_FirstLat+ISEC2_LatIncr*(grid->y.size-1))) <= 2 )
                  {
                    recompinc = false;
                    grid->y.inc = ISEC2_LatIncr * 0.001;
                  }
              }

            /* recompute yinc if necessary */
            if ( recompinc ) grid->y.inc = (ISEC2_LastLat - ISEC2_FirstLat) * 0.001 / (grid->y.size - 1);
          }
        grid->y.first = ISEC2_FirstLat * 0.001;
        grid->y.last  = ISEC2_LastLat  * 0.001;
        grid->y.flag  = 2;
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      }
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    }
  else if ( gridtype == GRID_GAUSSIAN_REDUCED )
    {
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      bool ijDirectionIncrementGiven = gribbyte_get_bit(ISEC2_ResFlag, 1);
      bool uvRelativeToGrid = gribbyte_get_bit(ISEC2_ResFlag, 5);
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      if ( uvRelativeToGrid ) grid->uvRelativeToGrid = 1;
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      grid->np      = ISEC2_NumPar;
      grid->size    = ISEC4_NumValues;
      grid->rowlon  = ISEC2_RowLonPtr;
      grid->nrowlon = ISEC2_NumLat;
      grid->y.size  = ISEC2_NumLat;
      grid->x.inc   = 0;
      grid->y.inc   = 0;
      grid->x.flag  = 0;
      /* if ( ISEC2_FirstLon != 0 || ISEC2_LastLon != 0 ) */
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      {
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        if ( grid->x.size > 1 )
          {
            if ( ISEC2_LastLon < ISEC2_FirstLon && ISEC2_LastLon < 0 ) ISEC2_LastLon += 360000;

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            if ( ijDirectionIncrementGiven && ISEC2_LonIncr > 0 )
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              grid->x.inc = ISEC2_LonIncr * 0.001;
            else
              grid->x.inc = (ISEC2_LastLon - ISEC2_FirstLon) * 0.001 / (grid->x.size - 1);
          }
        grid->x.first = ISEC2_FirstLon * 0.001;
        grid->x.last  = ISEC2_LastLon  * 0.001;
        grid->x.flag  = 2;
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      }
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      grid->y.flag = 0;
      /* if ( ISEC2_FirstLat != 0 || ISEC2_LastLat != 0 ) */
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      {
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        if ( grid->y.size > 1 )
          {
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            if ( ijDirectionIncrementGiven && ISEC2_LatIncr > 0 )
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              grid->y.inc = ISEC2_LatIncr * 0.001;
            else
              grid->y.inc = (ISEC2_LastLat - ISEC2_FirstLat) * 0.001 / (grid->y.size - 1);
          }
        grid->y.first = ISEC2_FirstLat * 0.001;
        grid->y.last  = ISEC2_LastLat  * 0.001;
        grid->y.flag  = 2;
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      }
    }
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  else if ( projtype == CDI_PROJ_LCC )
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    {
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      bool uvRelativeToGrid = gribbyte_get_bit(ISEC2_ResFlag, 5);
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      if ( uvRelativeToGrid ) grid->uvRelativeToGrid = 1;

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      if ( ISEC4_NumValues != ISEC2_NumLon*ISEC2_NumLat )
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        Error("numberOfPoints (%d) and gridSize (%d) differ!", ISEC4_NumValues, ISEC2_NumLon*ISEC2_NumLat);
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      grid->size   = ISEC4_NumValues;
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      grid->x.size = ISEC2_NumLon;
      grid->y.size = ISEC2_NumLat;

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      grid->x.first = 0;
      grid->x.last  = 0;
      grid->x.inc   = ISEC2_Lambert_dx;
      grid->y.first = 0;
      grid->y.last  = 0;
      grid->y.inc   = ISEC2_Lambert_dy;
      grid->x.flag  = 2;
      grid->y.flag  = 2;
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    }
  else if ( gridtype == GRID_SPECTRAL )
    {
      grid->size  = ISEC4_NumValues;
      grid->trunc = ISEC2_PentaJ;
      if ( ISEC2_RepMode == 2 )
        grid->lcomplex = 1;
      else
        grid->lcomplex = 0;
    }
  else if ( gridtype == GRID_GME )
    {
      grid->size  = ISEC4_NumValues;
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      grid->gme.nd  = ISEC2_GME_ND;
      grid->gme.ni  = ISEC2_GME_NI;
      grid->gme.ni2 = ISEC2_GME_NI2;
      grid->gme.ni3 = ISEC2_GME_NI3;
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    }
  else if ( gridtype == GRID_GENERIC )
    {
      grid->size  = ISEC4_NumValues;
      grid->x.size = 0;
      grid->y.size = 0;
    }
  else
    {
      Error("Unsupported grid type: %s", gridNamePtr(gridtype));
    }
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  grid->type = gridtype;
  grid->projtype = projtype;
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}

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static
void cgribexGetLevel(int *isec1, int *leveltype, int *level1, int *level2)
{
  *leveltype = ISEC1_LevelType;
  *level1 = ISEC1_Level1;
  *level2 = ISEC1_Level2;
  if ( *leveltype == GRIB1_LTYPE_ISOBARIC ) *level1 *= 100;
  else if ( *leveltype == GRIB1_LTYPE_99 || *leveltype == GRIB1_LTYPE_ISOBARIC_PA ) *leveltype = GRIB1_LTYPE_ISOBARIC;
}

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void cgribexAddRecord(stream_t * streamptr, int param, int *isec1, int *isec2, double *fsec2, double *fsec3,
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		      int *isec4, size_t recsize, off_t position, int datatype, int comptype, int lmv, int iret)
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{
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  int varID;
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  int levelID = 0;

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  int vlistID = streamptr->vlistID;
  int tsID    = streamptr->curTsID;
  int recID   = recordNewEntry(streamptr, tsID);
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  record_t *record = &streamptr->tsteps[tsID].records[recID];
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  int tsteptype = cgribexGetTsteptype(ISEC1_TimeRange);
  int numavg    = ISEC1_AvgNum;
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  int leveltype, level1, level2;
  cgribexGetLevel(isec1, &leveltype, &level1, &level2);
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  /* fprintf(stderr, "param %d %d %d %d\n", param, level1, level2, leveltype); */
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  record->size      = recsize;
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  record->position  = position;
  record->param     = param;
  record->ilevel    = level1;
  record->ilevel2   = level2;
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  record->ltype     = leveltype;
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  record->tsteptype = (short)tsteptype;
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  grid_t *gridptr = (grid_t*) Malloc(sizeof(*gridptr));
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  cgribexGetGrid(streamptr, isec2, isec4, gridptr, iret);
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  struct addIfNewRes gridAdded = cdiVlistAddGridIfNew(vlistID, gridptr, 0);
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  int gridID = gridAdded.Id;
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  if ( gridAdded.isNew )
    {
      if ( gridptr->nrowlon )
        {
          size_t nrowlon = (size_t) gridptr->nrowlon;
          int *rowlon = gridptr->rowlon;
          gridptr->rowlon = (int*) Malloc(nrowlon * sizeof(int));
          memcpy(gridptr->rowlon, rowlon, nrowlon * sizeof(int));
        }
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      else if ( gridptr->projtype == CDI_PROJ_RLL )
        {
          double xpole =   ISEC2_LonSP*0.001 - 180;
          double ypole = - ISEC2_LatSP*0.001;
          double angle = - FSEC2_RotAngle;
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          gridDefParamRLL(gridID, xpole, ypole, angle);
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        }
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      else if ( gridptr->projtype == CDI_PROJ_LCC )
        {
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          double a = 6367470., rf = 0;
          bool earthIsOblate = gribbyte_get_bit(ISEC2_ResFlag, 2);
          if ( earthIsOblate ) { a = 6378160.; rf = 297.0; }
          double xval_0 = ISEC2_FirstLon * 0.001;
          double yval_0 = ISEC2_FirstLat * 0.001;
          double lon_0  = ISEC2_Lambert_Lov * 0.001;
          double lat_1  = ISEC2_Lambert_LatS1 * 0.001;
          double lat_2  = ISEC2_Lambert_LatS2 * 0.001;
          bool lsouth = gribbyte_get_bit(ISEC2_Lambert_ProjFlag, 1);
          if ( lsouth ) { lat_1 = -lat_1; lat_2 = -lat_2; }
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          double lat_0 = lat_2;
          double x_0 = grid_missval;
          double y_0 = grid_missval;
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          if ( proj_lonlat_to_lcc_func )
            {
              x_0 = xval_0; y_0 = yval_0;
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              proj_lonlat_to_lcc_func(grid_missval, lon_0, lat_0, lat_1, lat_2, a, rf, (size_t)1, &x_0, &y_0);
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              if ( IS_NOT_EQUAL(x_0, grid_missval) && IS_NOT_EQUAL(y_0, grid_missval) )
                { x_0 = -x_0; y_0 = -y_0; }
            }
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          gridDefParamLCC(gridID, grid_missval, lon_0, lat_0, lat_1, lat_2, a, rf, xval_0, yval_0, x_0, y_0);
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        }
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    }
  else
    Free(gridptr);
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  int zaxistype = grib1ltypeToZaxisType(leveltype);
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  if ( zaxistype == ZAXIS_HYBRID || zaxistype == ZAXIS_HYBRID_HALF )
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    {
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      size_t vctsize = (size_t)ISEC2_NumVCP;
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      double *vctptr = &fsec2[10];

      varDefVCT(vctsize, vctptr);
    }

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  int lbounds = cgribexGetZaxisHasBounds(leveltype);
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  if ( datatype > 32 ) datatype = CDI_DATATYPE_PACK32;
  if ( datatype <  0 ) datatype = CDI_DATATYPE_PACK;
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  varAddRecord(recID, param, gridID, zaxistype, lbounds, level1, level2, 0, 0,
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	       datatype, &varID, &levelID, tsteptype, numavg, leveltype, -1,
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               NULL, NULL, NULL, NULL, NULL, NULL);
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  record->varID   = (short)varID;
  record->levelID = (short)levelID;
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  varDefCompType(varID, comptype);
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  if ( ISEC1_LocalFLag )
    {
      if      ( ISEC1_CenterID == 78  && isec1[36] == 253 ) // DWD local extension
        varDefEnsembleInfo(varID, isec1[54], isec1[53], isec1[52]);
      else if ( ISEC1_CenterID == 252 && isec1[36] ==   1 ) // MPIM local extension
        varDefEnsembleInfo(varID, isec1[38], isec1[39], isec1[37]);
    }
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  if ( lmv ) varDefMissval(varID, FSEC3_MissVal);

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  if ( varInqInst(varID) == CDI_UNDEFID )
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    {
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      int center    = ISEC1_CenterID;
      int subcenter = ISEC1_SubCenterID;
      int instID    = institutInq(center, subcenter, NULL, NULL);
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      if ( instID == CDI_UNDEFID )
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	instID = institutDef(center, subcenter, NULL, NULL);
      varDefInst(varID, instID);
    }

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  if ( varInqModel(varID) == CDI_UNDEFID )
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    {
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      int modelID = modelInq(varInqInst(varID), ISEC1_ModelID, NULL);
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      if ( modelID == CDI_UNDEFID )
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	modelID = modelDef(varInqInst(varID), ISEC1_ModelID, NULL);
      varDefModel(varID, modelID);
    }

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  if ( varInqTable(varID) == CDI_UNDEFID )
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    {
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      int tableID = tableInq(varInqModel(varID), ISEC1_CodeTable, NULL);
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      if ( tableID == CDI_UNDEFID )
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	tableID = tableDef(varInqModel(varID), ISEC1_CodeTable, NULL);
      varDefTable(varID, tableID);
    }

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  streamptr->tsteps[tsID].nallrecs++;
  streamptr->nrecs++;
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}

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static
void MCH_get_undef(int *isec1, double *undef_pds, double *undef_eps)
{
  /* 2010-01-13: Oliver Fuhrer */
  if ( ISEC1_CenterID == 215 ) {
    if (isec1[34] != 0 && isec1[34] != 255) {
      if (isec1[34] & 2) {
        if (isec1[34] & 1) {
          *undef_pds = -0.99*pow(10.0,-isec1[35]);
        } else {
          *undef_pds = +0.99*pow(10.0,-isec1[35]);
        }
        *undef_eps = pow(10.0,-isec1[35]-1);
      } else {
        if (isec1[34] & 1) {
          *undef_pds = -0.99*pow(10.0,+isec1[35]);
        } else {
          *undef_pds = +0.99*pow(10.0,+isec1[35]);
        }
        *undef_eps = pow(10.0,isec1[35]-1);
      }
    }
  }
}

static
void cgribexDecodeHeader(int *isec0, int *isec1, int *isec2, double *fsec2,
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			 int *isec3, double *fsec3, int *isec4, double *fsec4,
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			 int *gribbuffer, int recsize, int *lmv, int *iret)
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{
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  int ipunp = 0, iword = 0;
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  memset(isec1, 0, 256*sizeof(int));
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  memset(isec2, 0, 32*sizeof(int));
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  gribExDP(isec0, isec1, isec2, fsec2, isec3, fsec3, isec4, fsec4,
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	   ipunp, (int *) gribbuffer, recsize, &iword, "J", iret);
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  if ( !(ISEC1_Sec2Or3Flag & 128) ) isec2[0] = -1; // default generic grid

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  *lmv = 0;

  if ( ISEC1_CenterID == 215 && (isec1[34] != 0 && isec1[34] != 255) )
    {
      double undef_pds, undef_eps;
      MCH_get_undef(isec1, &undef_pds, &undef_eps);
      FSEC3_MissVal = undef_pds;
      *lmv = 1;
    }
}
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static
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compvar_t cgribexVarSet(int param, int level1, int level2, int leveltype, int trange)
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{
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  int tsteptype = cgribexGetTsteptype(trange);
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  compvar_t compVar;
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  compVar.param     = param;
  compVar.level1    = level1;
  compVar.level2    = level2;
  compVar.ltype     = leveltype;
  compVar.tsteptype = tsteptype;
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  return compVar;
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}

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static inline int
cgribexVarCompare(compvar_t compVar, record_t record, int flag)
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{
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  bool vinst = compVar.tsteptype == TSTEP_INSTANT || compVar.tsteptype == TSTEP_INSTANT2 || compVar.tsteptype == TSTEP_INSTANT3;
  bool rinst = record.tsteptype == TSTEP_INSTANT || record.tsteptype == TSTEP_INSTANT2 || record.tsteptype == TSTEP_INSTANT3;
  int tstepDiff = (!((flag == 0) & (vinst && rinst)))
                & (compVar.tsteptype != record.tsteptype);
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  int rstatus = (compVar.param != record.param)
    |           (compVar.level1 != record.ilevel)
    |           (compVar.level2 != record.ilevel2)
    |           (compVar.ltype != record.ltype)
    |           tstepDiff;
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  return rstatus;
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}
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#endif
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#define gribWarning(text, nrecs, timestep, paramstr, level1, level2) \
            Warning("Record %2d (id=%s lev1=%d lev2=%d) timestep %d: %s", nrecs, paramstr, level1, level2, timestep, text)

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#if  defined  (HAVE_LIBCGRIBEX)
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static inline void
cgribexScanTsFixNtsteps(stream_t *streamptr, off_t recpos)
{
  if ( streamptr->ntsteps == -1 )
    {
      int tsID = tstepsNewEntry(streamptr);
      if ( tsID != streamptr->rtsteps )
	Error("Internal error. tsID = %d", tsID);

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      streamptr->tsteps[tsID-1].next   = true;
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      streamptr->tsteps[tsID].position = recpos;
    }
}

static inline void
cgribexScanTsConstAdjust(stream_t *streamptr, taxis_t *taxis)
{
  int vlistID = streamptr->vlistID;
  if ( streamptr->ntsteps == 1 )
    {
      if ( taxis->vdate == 0 && taxis->vtime == 0 )
	{
	  streamptr->ntsteps = 0;
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	  for ( int varID = 0; varID < streamptr->nvars; varID++ )
            vlistDefVarTsteptype(vlistID, varID, TSTEP_CONSTANT);
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	}
    }
}


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int cgribexScanTimestep1(stream_t *streamptr)
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{
  double fsec2[512], fsec3[2], *fsec4 = NULL;
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  int lmv = 0, iret = 0;
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  off_t recpos = 0;
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  void *gribbuffer = NULL;
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  size_t buffersize = 0;
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  int rstatus;
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  int param = 0;
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  int leveltype = 0, level1 = 0, level2 = 0, vdate = 0, vtime = 0;
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  DateTime datetime, datetime0 = { LONG_MIN, LONG_MIN };
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  size_t readsize;
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  unsigned nrecords, recID;
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  int nrecs_scanned = 0;
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  int datatype;
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  size_t recsize = 0;
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  bool warn_time = true;
  bool warn_numavg = true;
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  int taxisID = -1;
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  int rdate = 0, rtime = 0, tunit = 0;
  bool fcast = false;
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  int vlistID;
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  int comptype;
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  size_t unzipsize;
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  char paramstr[32];
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  int nskip = cdiSkipRecords;
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  streamptr->curTsID = 0;
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  int *isec0 = streamptr->record->sec0;
  int *isec1 = streamptr->record->sec1;
  int *isec2 = streamptr->record->sec2;
  int *isec3 = streamptr->record->sec3;
  int *isec4 = streamptr->record->sec4;
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  int tsID  = tstepsNewEntry(streamptr);
  taxis_t *taxis = &streamptr->tsteps[tsID].taxis;
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  if ( tsID != 0 )
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    Error("Internal problem! tstepsNewEntry returns %d", tsID);
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  int fileID = streamptr->fileID;
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  while ( nskip-- > 0 )
    {
      recsize = gribGetSize(fileID);
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      if ( recsize == 0 )
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	Error("Skipping of %d records failed!", cdiSkipRecords);
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      recpos  = fileGetPos(fileID);
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      fileSetPos(fileID, (off_t)recsize, SEEK_CUR);
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    }

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  unsigned nrecs = 0;
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  while ( true )
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    {
      recsize = gribGetSize(fileID);
      recpos  = fileGetPos(fileID);

      if ( recsize == 0 )
	{
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	  if ( nrecs == 0 )
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	    Error("No GRIB records found!");
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	  streamptr->ntsteps = 1;
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	  break;
	}
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      if ( recsize > buffersize )
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	{
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	  buffersize = recsize;
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	  gribbuffer = Realloc(gribbuffer, buffersize);
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	}

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      readsize = recsize;
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      rstatus = gribRead(fileID, (unsigned char *)gribbuffer, &readsize);
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      if ( rstatus ) break;
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      comptype = CDI_COMPRESS_NONE;
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      if ( gribGetZip(recsize, (unsigned char *)gribbuffer, &unzipsize) > 0 )
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	{
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	  comptype = CDI_COMPRESS_SZIP;
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	  unzipsize += 100; /* need 0 to 1 bytes for rounding of bds */
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	  if ( buffersize < unzipsize )
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	    {
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	      buffersize = unzipsize;
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	      gribbuffer = Realloc(gribbuffer, buffersize);
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	    }
	}

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      nrecs_scanned++;
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      cgribexDecodeHeader(isec0, isec1, isec2, fsec2, isec3, fsec3, isec4, fsec4,
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			  (int *) gribbuffer, (int)recsize, &lmv, &iret);
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      param = cdiEncodeParam(ISEC1_Parameter, ISEC1_CodeTable, 255);
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      cdiParamToString(param, paramstr, sizeof(paramstr));

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      cgribexGetLevel(isec1, &leveltype, &level1, &level2);
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      gribDateTime(isec1, &vdate, &vtime);

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      datatype = (ISEC4_NumBits > 0 && ISEC4_NumBits <= 32) ? ISEC4_NumBits : CDI_DATATYPE_PACK;
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      if ( nrecs == 0 )
	{
	  datetime0.date = vdate;
	  datetime0.time = vtime;
	  rdate = gribRefDate(isec1);
	  rtime = gribRefTime(isec1);
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	  tunit = cgribexGetTimeUnit(isec1);
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	  fcast = cgribexTimeIsFC(isec1);
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	}
      else
	{
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	  datetime.date = vdate;
	  datetime.time = vtime;
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	  compvar_t compVar = cgribexVarSet(param, level1, level2, leveltype, ISEC1_TimeRange);
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	  for ( recID = 0; recID < nrecs; recID++ )
	    {
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	      if ( cgribexVarCompare(compVar, streamptr->tsteps[0].records[recID], 0) == 0 ) break;
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	    }
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	  if ( cdiInventoryMode == 1 )
	    {
	      if ( recID < nrecs ) break;
	      if ( warn_time )
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		if ( datetimeCmp(datetime, datetime0) != 0 )
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		  {
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                    gribWarning("Inconsistent verification time!", nrecs_scanned, tsID+1, paramstr, level1, level2);
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		    warn_time = false;
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		  }
	    }
	  else
	    {
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	      if ( datetimeCmp(datetime, datetime0) != 0 ) break;
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	      if ( recID < nrecs )
		{
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		  gribWarning("Parameter already exist, skipped!", nrecs_scanned, tsID+1, paramstr, level1, level2);
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		  continue;
		}
	    }
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	}

      if ( ISEC1_AvgNum )
	{
	  if (  taxis->numavg && warn_numavg && (taxis->numavg != ISEC1_AvgNum) )
	    {
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	      Warning("Changing numavg from %d to %d not supported!", taxis->numavg, ISEC1_AvgNum);
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	      warn_numavg = false;
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	    }
	  else
	    {
	      taxis->numavg = ISEC1_AvgNum;
	    }
	}

      nrecs++;

      if ( CDI_Debug )
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	Message("Read record %2d (id=%s lev1=%d lev2=%d) %8d %6d", nrecs_scanned, paramstr, level1, level2, vdate, vtime);
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      cgribexAddRecord(streamptr, param, isec1, isec2, fsec2, fsec3,
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		       isec4, recsize, recpos, datatype, comptype, lmv, iret);
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    }

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  streamptr->rtsteps = 1;
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  if ( nrecs == 0 ) return CDI_EUFSTRUCT;
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  cdi_generate_vars(streamptr);
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  if ( fcast )
    {
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      taxisID = taxisCreate(TAXIS_RELATIVE);
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      taxis->type  = TAXIS_RELATIVE;
      taxis->rdate = rdate;
      taxis->rtime = rtime;
      taxis->unit  = tunit;
    }
  else
    {
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      taxisID = taxisCreate(TAXIS_ABSOLUTE);
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      taxis->type  = TAXIS_ABSOLUTE;
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      taxis->unit  = tunit;
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    }

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  taxis->vdate = (int)datetime0.date;
  taxis->vtime = (int)datetime0.time;
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  vlistID = streamptr->vlistID;
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  vlistDefTaxis(vlistID, taxisID);

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  nrecords = (unsigned)streamptr->tsteps[0].nallrecs;
  if ( nrecords < (unsigned)streamptr->tsteps[0].recordSize )
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    {
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      streamptr->tsteps[0].recordSize = (int)nrecords;
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      streamptr->tsteps[0].records =
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      (record_t *) Realloc(streamptr->tsteps[0].records, nrecords*sizeof(record_t));
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    }

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  streamptr->tsteps[0].recIDs = (int *) Malloc(nrecords*sizeof(int));
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  streamptr->tsteps[0].nrecs = (int)nrecords;
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  for ( recID = 0; recID < nrecords; recID++ )
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    streamptr->tsteps[0].recIDs[recID] = (int)recID;
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  streamptr->record->buffer     = gribbuffer;
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  streamptr->record->buffersize = buffersize;
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  cgribexScanTsFixNtsteps(streamptr, recpos);
  cgribexScanTsConstAdjust(streamptr, taxis);
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  return 0;
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}

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int cgribexScanTimestep2(stream_t * streamptr)
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{
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  int rstatus = 0;
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  double fsec2[512], fsec3[2], *fsec4 = NULL;
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  int lmv = 0, iret = 0;
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  off_t recpos = 0;
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  int param = 0;
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  int leveltype = 0, level1 = 0, level2 = 0, vdate = 0, vtime = 0;
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  DateTime datetime, datetime0 = { LONG_MIN, LONG_MIN };
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  int varID, gridID;
  size_t readsize;
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  int nrecs, recID;
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  size_t recsize = 0;
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  bool warn_numavg = true;
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  int tsteptype;
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  size_t unzipsize;
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  char paramstr[32];
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  streamptr->curTsID = 1;

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  int *isec0 = streamptr->record->sec0;
  int *isec1 = streamptr->record->sec1;
  int *isec2 = streamptr->record->sec2;
  int *isec3 = streamptr->record->sec3;
  int *isec4 = streamptr->record->sec4;
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  int fileID  = streamptr->fileID;
  int vlistID = streamptr->vlistID;
  int taxisID = vlistInqTaxis(vlistID);
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  void *gribbuffer = streamptr->record->buffer;
  size_t buffersize = streamptr->record->buffersize;
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  int tsID = streamptr->rtsteps;
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  if ( tsID != 1 )
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    Error("Internal problem! unexpected timestep %d", tsID+1);
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  taxis_t *taxis = &streamptr->tsteps[tsID].taxis;
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  fileSetPos(fileID, streamptr->tsteps[tsID].position, SEEK_SET);
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  cdi_create_records(streamptr, tsID);
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  int nrecords = streamptr->tsteps[tsID].nallrecs;
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  if ( nrecords ) streamptr->tsteps[1].recIDs = (int *) Malloc((size_t)nrecords * sizeof(int));
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  streamptr->tsteps[1].nrecs = 0;
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  for ( recID = 0; recID < nrecords; recID++ )
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    streamptr->tsteps[1].recIDs[recID] = -1;
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  for ( recID = 0; recID < nrecords; recID++ )
    {
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      varID = streamptr->tsteps[0].records[recID].varID;
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      streamptr->tsteps[tsID].records[recID].position =	streamptr->tsteps[0].records[recID].position;
      streamptr->tsteps[tsID].records[recID].size     =	streamptr->tsteps[0].records[recID].size;
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    }

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  int nrecs_scanned = nrecords;
  int rindex = 0;
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  while ( true )
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    {
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      if ( rindex > nrecords ) break;

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      recsize = gribGetSize(fileID);
      recpos  = fileGetPos(fileID);
      if ( recsize == 0 )
	{
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	  streamptr->ntsteps = 2;
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	  break;
	}
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      if ( recsize > buffersize )
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	{
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	  buffersize = recsize;
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	  gribbuffer = Realloc(gribbuffer, buffersize);
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