stream_cgribex.c

#if defined (HAVE_CONFIG_H)
#  include "config.h"
#endif

#include <stdio.h>
#include <float.h>  /* FLT_EPSILON */

#include "dmemory.h"
#include "cdi.h"
#include "stream_int.h"
#include "file.h"
#include "varscan.h"
#include "datetime.h"
#include "vlist.h"
#include "stream_grb.h"

#if  defined  (HAVE_LIBCGRIBEX)
#  include "cgribex.h"
#endif

extern int cdiInventoryMode;

typedef struct {
  int param;
  int level1;
  int level2;
  int ltype;
} compvar_t; 


static
int cgribexGetGridType(int *isec2)
{
  /*  static char func[] = "cgribexGetGridType"; */
  int gridtype = 0;

  switch (ISEC2_GridType)
    {
    case  GTYPE_LATLON:
    case  GTYPE_LATLON_ROT:
      {
	gridtype = GRID_LONLAT;
	break;
      }
    case  GTYPE_LCC:
      {
	gridtype = GRID_LCC;
	break;
      }
    case  GTYPE_GAUSSIAN:
      {
	if ( ISEC2_Reduced )
	  gridtype = GRID_GAUSSIAN_REDUCED;
	else
	  gridtype = GRID_GAUSSIAN;
	break;
      }
    case  GTYPE_SPECTRAL:
      {
	gridtype = GRID_SPECTRAL;
	break;
      }
    case  GTYPE_GME:
      {
	gridtype = GRID_GME;
	break;
      }
    default:
      {
	gridtype = GRID_GENERIC;
	break;
      }
    }

  return (gridtype);
}

static
int cgribexGetIsRotated(int *isec2)
{
  /*  static char func[] = "cgribexGetIsRotated"; */
  int isRotated = 0;

  if ( ISEC2_GridType == 10 )
    {
      isRotated = 1;
    }

  return (isRotated);
}


static
int cgribexGetZaxisType(int grb_ltype)
{
  int zaxistype = 0;

  switch ( grb_ltype )
    {
    case LTYPE_SURFACE:
      {
	zaxistype = ZAXIS_SURFACE;
	break;
      }
    case LTYPE_MEANSEA:
      {
	zaxistype = ZAXIS_MEANSEA;
	break;
      }
    case LTYPE_99:
    case LTYPE_ISOBARIC:
      {
	zaxistype = ZAXIS_PRESSURE;
	break;
      }
    case LTYPE_HEIGHT:
      {
	zaxistype = ZAXIS_HEIGHT;
	break;
      }
    case LTYPE_ALTITUDE:
      {
	zaxistype = ZAXIS_ALTITUDE;
	break;
      }
    case LTYPE_SIGMA:
      {
	zaxistype = ZAXIS_SIGMA;
	break;
      }
    case LTYPE_HYBRID:
    case LTYPE_HYBRID_LAYER:
      {
	zaxistype = ZAXIS_HYBRID;
	break;
      }
    case LTYPE_LANDDEPTH:
    case LTYPE_LANDDEPTH_LAYER:
      {
	zaxistype = ZAXIS_DEPTH_BELOW_LAND;
	break;
      }
    case LTYPE_ISENTROPIC:
      {
	zaxistype = ZAXIS_ISENTROPIC;
	break;
      }
    case LTYPE_SEADEPTH:
      {
	zaxistype = ZAXIS_DEPTH_BELOW_SEA;
	break;
      }
    default:
      {
	zaxistype = ZAXIS_GENERIC;
	break;
      }
    }

  return (zaxistype);
}

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

  switch (grb_ltype)
    {
    case LTYPE_HYBRID_LAYER:
    case LTYPE_LANDDEPTH_LAYER:
      {
	lbounds = 1;
	break;
      }
    }

  return (lbounds);
}

static
int cgribexGetTimeUnit(int *isec1)
{
  static char func[] = "cgribexGetTimeUnit";
  int timeunit = -1;
  static int lprint = TRUE;

  switch ( ISEC1_TimeUnit )
    {
    case ISEC1_TABLE4_MINUTE:  timeunit = TUNIT_MINUTE;  break;
    case ISEC1_TABLE4_QUARTER: timeunit = TUNIT_QUARTER; break;
    case ISEC1_TABLE4_HOUR:    timeunit = TUNIT_HOUR;    break;
    case ISEC1_TABLE4_DAY:     timeunit = TUNIT_DAY;     break;
    default:
      if ( lprint )
	{
	  Message(func, "Time unit %d unsupported", ISEC1_TimeUnit);
	  lprint = FALSE;
	}
    }

  return (timeunit);
}

static
int cgribexTimeIsFC(int *isec1)
{
  int isFC = TRUE;

  if ( ISEC1_TimeRange == 10 && ISEC1_TimePeriod1 == 0 && ISEC1_TimePeriod2 == 0 )
    isFC = FALSE;

  return (isFC);
}

static
int cgribexGetTsteptype(int timerange)
{
  static char func[] = "cgribexGetTsteptype";
  int tsteptype = 0;
  static int lprint = TRUE;

  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 )
	{
	  Message(func, "Time range %d unsupported", timerange);
	  lprint = FALSE;
	}
    }

  return (tsteptype);
}


static
void cgribexAddRecord(int streamID, int param, int *isec1, int *isec2, double *fsec2, double *fsec3,
		      int *isec4, long recsize, off_t position, int prec, int ztype, int lmv)
{
  static char func[] = "cgribexAddRecord";
  int gridtype;
  int zaxistype;
  int gridID = CDI_UNDEFID, varID;
  int levelID = 0;
  int tsID, recID;
  int level1, level2;
  int numavg;
  int tsteptype;
  int lbounds = 0;
  record_t *record;
  grid_t grid;
  int vlistID;
  stream_t *streamptr;

  streamptr = stream_to_pointer(streamID);

  vlistID = streamInqVlist(streamID);
  tsID    = streamptr->curTsID;
  recID   = recordNewEntry(streamID, tsID);
  record  = &streamptr->tsteps[tsID].records[recID];

  tsteptype = cgribexGetTsteptype(ISEC1_TimeRange);
  numavg    = ISEC1_AvgNum;

  level1  = ISEC1_Level1;
  level2  = ISEC1_Level2;

  /* fprintf(stderr, "param %d %d %d %d\n", param, level1, level2, ISEC1_LevelType); */

  (*record).size     = recsize;
  (*record).position = position;
  (*record).param    = param;
  (*record).ilevel   = level1;
  (*record).ilevel2  = level2;
  (*record).ltype    = ISEC1_LevelType;

  gridtype = cgribexGetGridType(isec2);

  if ( streamptr->unreduced && gridtype == GRID_GAUSSIAN_REDUCED )
    {
      gridtype = GRID_GAUSSIAN;
      ISEC2_NumLon = 2*ISEC2_NumLat;
      ISEC4_NumValues = ISEC2_NumLon*ISEC2_NumLat;
    }

  memset(&grid, 0, sizeof(grid_t));
  switch (gridtype)
    {
    case GRID_LONLAT:
    case GRID_GAUSSIAN:
      {
	if ( ISEC4_NumValues != ISEC2_NumLon*ISEC2_NumLat )
	  Error(func, "numberOfPoints (%d) and gridSize (%d) differ!",
		ISEC4_NumValues, ISEC2_NumLon*ISEC2_NumLat);
	grid.size  = ISEC4_NumValues;
	grid.xsize = ISEC2_NumLon;
	grid.ysize = ISEC2_NumLat;
	grid.xinc  = 0;
	grid.yinc  = 0;
	grid.xdef  = 0;
	/* if ( ISEC2_FirstLon != 0 || ISEC2_LastLon != 0 ) */
	  {
	    if ( grid.xsize > 1 )
	      {
		if ( ISEC2_ResFlag && ISEC2_LonIncr > 0 )
		  grid.xinc = ISEC2_LonIncr * 0.001;
		else
		  grid.xinc = (ISEC2_LastLon - ISEC2_FirstLon) * 0.001 / (grid.xsize - 1);

		/* correct xinc if necessary */
		if ( ISEC2_FirstLon == 0 && ISEC2_LastLon > 354000 )
		  {
		    double xinc = 360. / grid.xsize;

		    if ( fabs(grid.xinc-xinc) > 0.0 )
		      {
			grid.xinc = xinc;
			if ( CDI_Debug ) Message(func, "set xinc to %g", grid.xinc);
		      }
		  }
	      }
	    grid.xfirst = ISEC2_FirstLon * 0.001;
	    grid.xlast  = ISEC2_LastLon  * 0.001;
	    grid.xdef   = 2;	    
	  }
	grid.ydef  = 0;
	/* if ( ISEC2_FirstLat != 0 || ISEC2_LastLat != 0 ) */
	  {
	    if ( grid.ysize > 1 )
	      {
		if ( ISEC2_ResFlag && ISEC2_LatIncr > 0 )
		  grid.yinc = ISEC2_LatIncr * 0.001;
		else
		  grid.yinc = (ISEC2_LastLat - ISEC2_FirstLat) * 0.001 / (grid.ysize - 1);
	      }
	    grid.yfirst = ISEC2_FirstLat * 0.001;
	    grid.ylast  = ISEC2_LastLat  * 0.001;
	    grid.ydef   = 2;	    
	  }
	break;
      }
    case GRID_GAUSSIAN_REDUCED:
      {
	grid.size   = ISEC4_NumValues;
        grid.rowlon = ISEC2_RowLonPtr;
	grid.ysize  = ISEC2_NumLat;
	grid.xinc  = 0;
	grid.yinc  = 0;
	grid.xdef  = 0;
	/* if ( ISEC2_FirstLon != 0 || ISEC2_LastLon != 0 ) */
	  {
	    if ( grid.xsize > 1 )
	      {
		if ( ISEC2_ResFlag && ISEC2_LonIncr > 0 )
		  grid.xinc = ISEC2_LonIncr * 0.001;
		else
		  grid.xinc = (ISEC2_LastLon - ISEC2_FirstLon) * 0.001 / (grid.xsize - 1);
	      }
	    grid.xfirst = ISEC2_FirstLon * 0.001;
	    grid.xlast  = ISEC2_LastLon  * 0.001;
	    grid.xdef   = 2;	    
	  }
	grid.ydef  = 0;
	/* if ( ISEC2_FirstLat != 0 || ISEC2_LastLat != 0 ) */
	  {
	    if ( grid.ysize > 1 )
	      {
		if ( ISEC2_ResFlag && ISEC2_LatIncr > 0 )
		  grid.yinc = ISEC2_LatIncr * 0.001;
		else
		  grid.yinc = (ISEC2_LastLat - ISEC2_FirstLat) * 0.001 / (grid.ysize - 1);
	      }
	    grid.yfirst = ISEC2_FirstLat * 0.001;
	    grid.ylast  = ISEC2_LastLat  * 0.001;
	    grid.ydef   = 2;	    
	  }
	break;
      }
    case GRID_LCC:
      {
	if ( ISEC4_NumValues != ISEC2_NumLon*ISEC2_NumLat )
	  Error(func, "numberOfPoints (%d) and gridSize (%d) differ!",
		ISEC4_NumValues, ISEC2_NumLon*ISEC2_NumLat);

	grid.size  = ISEC4_NumValues;
	grid.xsize = ISEC2_NumLon;
	grid.ysize = ISEC2_NumLat;

	grid.lcc_xinc      = ISEC2_Lambert_dx;
	grid.lcc_yinc      = ISEC2_Lambert_dy;
	grid.lcc_originLon = ISEC2_FirstLon * 0.001;
	grid.lcc_originLat = ISEC2_FirstLat * 0.001;
	grid.lcc_lonParY   = ISEC2_Lambert_Lov * 0.001;
	grid.lcc_lat1      = ISEC2_Lambert_LatS1 * 0.001;
	grid.lcc_lat2      = ISEC2_Lambert_LatS2 * 0.001;
	grid.lcc_projflag  = ISEC2_Lambert_ProjFlag;
	grid.lcc_scanflag  = ISEC2_ScanFlag;

	grid.xdef   = 0;	    
	grid.ydef   = 0;

	break;
      }
    case GRID_SPECTRAL:
      {
	grid.size  = ISEC4_NumValues;
	grid.trunc = ISEC2_PentaJ;
	break;
      }
    case GRID_GME:
      {
	grid.size  = ISEC4_NumValues;
	grid.nd    = ISEC2_GME_ND;
	grid.ni    = ISEC2_GME_NI;
	grid.ni2   = ISEC2_GME_NI2;
	grid.ni3   = ISEC2_GME_NI3;
	break;
      }
    case GRID_GENERIC:
      {
	grid.size  = ISEC4_NumValues;
	grid.xsize = 0;
	grid.ysize = 0;
	break;
      }
    default:
      {
	Error(func, "%s grid unsupported!", gridNamePtr(gridtype));
	break;
      }
    }

  grid.isRotated = FALSE;
  if ( cgribexGetIsRotated(isec2) )
    {
      grid.isRotated = TRUE;
      grid.ypole     = - ISEC2_LatSP * 0.001;
      grid.xpole     =   ISEC2_LonSP * 0.001 - 180;
      grid.angle     = 0;
    }

  grid.xvals = NULL;
  grid.yvals = NULL;
  grid.type  = gridtype;

  gridID = varDefGrid(vlistID, grid, 0);

  zaxistype = cgribexGetZaxisType(ISEC1_LevelType);

  if ( zaxistype == ZAXIS_HYBRID )
    {
      int vctsize = ISEC2_NumVCP;
      double *vctptr = &fsec2[10];

      varDefVCT(vctsize, vctptr);
    }

  lbounds = cgribexGetZaxisHasBounds(ISEC1_LevelType);

  if ( prec > 32 ) prec = DATATYPE_PACK32;
  if ( prec <  0 ) prec = DATATYPE_PACK;

  varAddRecord(recID, param, gridID, zaxistype, lbounds, level1, level2,
	       prec, &varID, &levelID, tsteptype, numavg, ISEC1_LevelType, NULL, NULL, NULL);

  (*record).varID   = varID;
  (*record).levelID = levelID;

  varDefZtype(varID, ztype);

  if ( lmv ) varDefMissval(varID, FSEC3_MissVal);

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

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

  if ( varInqTable(varID) == CDI_UNDEFID )
    {
      int tableID;

      tableID = tableInq(varInqModel(varID), ISEC1_CodeTable, NULL);

      if ( tableID == CDI_UNDEFID )
	tableID = tableDef(varInqModel(varID), ISEC1_CodeTable, NULL);
      varDefTable(varID, tableID);
    }

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

  if ( CDI_Debug )
    Message(func, "varID = %d  param = %d  zaxistype = %d  gridID = %d  levelID = %d",
	    varID, param, zaxistype, gridID, levelID);
}

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,
			 int *isec3, double *fsec3, int *isec4, double *fsec4, 
			 int *gribbuffer, int recsize, int *lmv)
{
  int iret = 0, ipunp = 0, iword = 0;

  gribExDP(isec0, isec1, isec2, fsec2, isec3, fsec3, isec4, fsec4,
	   ipunp, (int *) gribbuffer, recsize, &iword, "J", &iret);

  *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;
    }
}


void cgribexScanTimestep1(int streamID)
{
  static char func[] = "cgribexScanTimestep1";
  int *isec0, *isec1, *isec2, *isec3, *isec4;
  double fsec2[512], fsec3[2], *fsec4 = NULL;
  int lmv = 0;
  off_t recpos = 0;
  unsigned char *gribbuffer = NULL;
  long buffersize = 0;
  int status;
  int fileID;
  int param = 0;
  int level1 = 0, level2 = 0, vdate = 0, vtime = 0;
  DateTime datetime, datetime0;
  int tsID;
  int varID;
  size_t readsize;
  int nrecords, nrecs, recID;
  int prec;
  long recsize = 0;
  int warn_time = TRUE;
  int warn_numavg = TRUE;
  int taxisID = -1;
  int rdate = 0, rtime = 0, tunit = 0, fcast = 0;
  TAXIS *taxis;
  int vlistID;
  int ztype;
  long unzipsize;
  compvar_t compVar, compVar0;
  stream_t *streamptr;

  streamptr = stream_to_pointer(streamID);

  stream_check_ptr(func, streamptr);

  streamptr->curTsID = 0;

  isec0 = streamptr->record->sec0;
  isec1 = streamptr->record->sec1;
  isec2 = streamptr->record->sec2;
  isec3 = streamptr->record->sec3;
  isec4 = streamptr->record->sec4;

  tsID  = tstepsNewEntry(streamID);
  taxis = &streamptr->tsteps[tsID].taxis;

  if ( tsID != 0 )
    Error(func, "Internal problem! tstepsNewEntry returns %d", tsID);

  fileID = streamInqFileID(streamID);

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

      if ( recsize == 0 )
	{
	  streamptr->ntsteps = 1;
	  break;
	}
      if ( recsize > buffersize )
	{
	  buffersize = recsize;
	  gribbuffer = (unsigned char *) realloc(gribbuffer, buffersize);
	}

      readsize = recsize;
      status = gribRead(fileID, gribbuffer, &readsize);
      if ( status ) break;

      ztype = COMPRESS_NONE;
      if ( gribGetZip(recsize, gribbuffer, &unzipsize) > 0 )
	{
	  ztype = COMPRESS_SZIP;
	  unzipsize += 100; /* need 0 to 1 bytes for rounding of bds */
	  if ( (long) buffersize < unzipsize )
	    {
	      buffersize = unzipsize;
	      gribbuffer = (unsigned char *) realloc(gribbuffer, buffersize);
	    }
	}

      cgribexDecodeHeader(isec0, isec1, isec2, fsec2, isec3, fsec3, isec4, fsec4,
			  (int *) gribbuffer, recsize, &lmv);

      param = cdiEncodeParam(ISEC1_Parameter, ISEC1_CodeTable, 255);
      if ( ISEC1_LevelType == 100 ) ISEC1_Level1 *= 100;
      if ( ISEC1_LevelType ==  99 ) ISEC1_LevelType = 100;
      level1   = ISEC1_Level1;
      level2   = ISEC1_Level2;

      gribDateTime(isec1, &vdate, &vtime);

      if ( ISEC4_NumBits > 0 && ISEC4_NumBits <= 32 )
	prec = ISEC4_NumBits;
      else
        prec = DATATYPE_PACK;

      if ( nrecs == 0 )
	{
	  datetime0.date = vdate;
	  datetime0.time = vtime;
	  rdate = gribRefDate(isec1);
	  rtime = gribRefTime(isec1);
	  tunit = cgribexGetTimeUnit(isec1);
	  fcast = cgribexTimeIsFC(isec1);
	}
      else
	{
	  datetime.date  = vdate;
	  datetime.time  = vtime;
	  compVar.param  = param;
          compVar.level1 = level1;
          compVar.level2 = level2;
          compVar.ltype  = ISEC1_LevelType;
	  for ( recID = 0; recID < nrecs; recID++ )
	    {
	      compVar0.param  = streamptr->tsteps[0].records[recID].param;
	      compVar0.level1 = streamptr->tsteps[0].records[recID].ilevel;
	      compVar0.level2 = streamptr->tsteps[0].records[recID].ilevel2;
	      compVar0.ltype  = streamptr->tsteps[0].records[recID].ltype;

	      if ( memcmp(&compVar0, &compVar, sizeof(compvar_t)) == 0 ) break;
	    }

	  if ( cdiInventoryMode == 1 )
	    {
	      if ( recID < nrecs ) break;
	      if ( warn_time )
		if ( memcmp(&datetime, &datetime0, sizeof(DateTime)) != 0 )
		  {
		    char paramstr[32];
		    cdiParamToString(param, paramstr, sizeof(paramstr));
		    Warning(func, "Inconsistent verification time (param=%s level=%d)", paramstr, level1);
		    warn_time = FALSE;
		  }
	    }
	  else
	    {
	      if ( memcmp(&datetime, &datetime0, sizeof(DateTime)) != 0 ) break;

	      if ( recID < nrecs )
		{
		  char paramstr[32];
		  cdiParamToString(param, paramstr, sizeof(paramstr));
		  Warning(func, "Param=%s level=%d already exist, skipped!", paramstr, level1);
		  continue;
		}
	    }
	}

      if ( ISEC1_AvgNum )
	{
	  if (  taxis->numavg && warn_numavg && (taxis->numavg != ISEC1_AvgNum) )
	    {
	      Message(func, "Change numavg from %d to %d not allowed!",
		      taxis->numavg, ISEC1_AvgNum);
	      warn_numavg = FALSE;
	    }
	  else
	    {
	      taxis->numavg = ISEC1_AvgNum;
	    }
	}

      nrecs++;

      if ( CDI_Debug )
	Message(func, "%4d %8d %4d  %8d %8d %6d", nrecs, (int)recpos, param, level1, vdate, vtime);

      cgribexAddRecord(streamID, param, isec1, isec2, fsec2, fsec3,
		       isec4, recsize, recpos, prec, ztype, lmv);
    }

  streamptr->rtsteps = 1;

  cdiGenVars(streamID);

  if ( fcast )
    {
      taxisID = taxisCreate(TAXIS_RELATIVE);
      taxis->type  = TAXIS_RELATIVE;
      taxis->rdate = rdate;
      taxis->rtime = rtime;
      taxis->unit  = tunit;
    }
  else
    {
      taxisID = taxisCreate(TAXIS_ABSOLUTE);
      taxis->type  = TAXIS_ABSOLUTE;
      taxis->unit  = tunit;
    }

  taxis->vdate = datetime0.date;
  taxis->vtime = datetime0.time;

  vlistID = streamInqVlist(streamID);
  vlistDefTaxis(vlistID, taxisID);

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

  streamptr->tsteps[0].recIDs = (int *) malloc(nrecords*sizeof(int));
  streamptr->tsteps[0].nrecs = nrecords;
  for ( recID = 0; recID < nrecords; recID++ )
    streamptr->tsteps[0].recIDs[recID] = recID;

  streamptr->record->buffer     = gribbuffer;
  streamptr->record->buffersize = buffersize;

  if ( streamptr->ntsteps == -1 )
    {
      tsID = tstepsNewEntry(streamID);
      if ( tsID != streamptr->rtsteps )
	Error(func, "Internal error. tsID = %d", tsID);

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

  if ( streamptr->ntsteps == 1 )
    {
      if ( taxis->vdate == 0 && taxis->vtime == 0 )
	{
	  streamptr->ntsteps = 0;
	  for ( varID = 0; varID < streamptr->nvars; varID++ )
	    {
	      vlistDefVarTime(vlistID, varID, TIME_CONSTANT);
	    }
	}
    }
}


int cgribexScanTimestep2(int streamID)
{
  static char func[] = "cgribexScanTimestep2";
  int *isec0, *isec1, *isec2, *isec3, *isec4;
  double fsec2[512], fsec3[2], *fsec4 = NULL;
  int lmv = 0;
  off_t recpos = 0;
  unsigned char *gribbuffer = NULL;
  long buffersize = 0;
  int status;
  int fileID;
  int param = 0;
  int level1 = 0, level2 = 0, vdate = 0, vtime = 0;
  DateTime datetime, datetime0;
  int tsID;
  int varID, gridID;
  size_t readsize;
  int nrecords, nrecs, recID, rindex;
  long recsize = 0;
  int warn_numavg = TRUE;
  int tsteptype;
  int taxisID = -1;
  TAXIS *taxis;
  int vlistID;
  long unzipsize;
  compvar_t compVar, compVar0;
  stream_t *streamptr;

  streamptr = stream_to_pointer(streamID);

  stream_check_ptr(func, streamptr);

  streamptr->curTsID = 1;

  isec0 = streamptr->record->sec0;
  isec1 = streamptr->record->sec1;
  isec2 = streamptr->record->sec2;
  isec3 = streamptr->record->sec3;
  isec4 = streamptr->record->sec4;

  fileID  = streamInqFileID(streamID);
  vlistID = streamInqVlist(streamID);
  taxisID = vlistInqTaxis(vlistID);

  gribbuffer = (unsigned char *) streamptr->record->buffer;
  buffersize = streamptr->record->buffersize;
                                          
  tsID = streamptr->rtsteps;
  if ( tsID != 1 )
    Error(func, "Internal problem! unexpeceted timestep %d", tsID+1);

  taxis = &streamptr->tsteps[tsID].taxis;

  fileSetPos(fileID, streamptr->tsteps[tsID].position, SEEK_SET);

  cdiCreateRecords(streamID, tsID);

  nrecords = streamptr->tsteps[tsID].nallrecs;
  streamptr->tsteps[1].recIDs = (int *) malloc(nrecords*sizeof(int));
  streamptr->tsteps[1].nrecs = 0;
  for ( recID = 0; recID < nrecords; recID++ )
    streamptr->tsteps[1].recIDs[recID] = -1;
      
  for ( recID = 0; recID < nrecords; recID++ )
    {
      varID = streamptr->tsteps[0].records[recID].varID;
      streamptr->tsteps[tsID].records[recID].position = 
	streamptr->tsteps[0].records[recID].position;
      streamptr->tsteps[tsID].records[recID].size     = 
	streamptr->tsteps[0].records[recID].size;
    }

  rindex = 0;
  while ( TRUE )
    {
      if ( rindex > nrecords ) break;

      recsize = gribGetSize(fileID);
      recpos  = fileGetPos(fileID);
      if ( recsize == 0 )
	{
	  streamptr->ntsteps = 2;
	  break;
	}
      if ( recsize > buffersize )
	{
	  buffersize = recsize;
	  gribbuffer = (unsigned char *) realloc(gribbuffer, (size_t)buffersize);
	}

      readsize = recsize;
      status = gribRead(fileID, gribbuffer, &readsize);
      if ( status ) break;

      if ( gribGetZip(recsize, gribbuffer, &unzipsize) > 0 )
	{
	  unzipsize += 100; /* need 0 to 1 bytes for rounding of bds */
	  if ( (long) buffersize < unzipsize )
	    {
	      buffersize = unzipsize;
	      gribbuffer = (unsigned char *) realloc(gribbuffer, buffersize);
	    }
	}

      cgribexDecodeHeader(isec0, isec1, isec2, fsec2, isec3, fsec3, isec4, fsec4,
			  (int *) gribbuffer, recsize, &lmv);

      param = cdiEncodeParam(ISEC1_Parameter, ISEC1_CodeTable, 255);
      if ( ISEC1_LevelType == 100 ) ISEC1_Level1 *= 100;
      if ( ISEC1_LevelType ==  99 ) ISEC1_LevelType = 100;
      level1    = ISEC1_Level1;
      level2    = ISEC1_Level2;

      gribDateTime(isec1, &vdate, &vtime);

      if ( rindex == 0 )
	{
	  if ( taxisInqType(taxisID) == TAXIS_RELATIVE )
	    {
	      taxis->type  = TAXIS_RELATIVE;
	      taxis->rdate = gribRefDate(isec1);
	      taxis->rtime = gribRefTime(isec1);
	    }
	  else
	    {
	      taxis->type  = TAXIS_ABSOLUTE;
	    }
	  taxis->unit  = cgribexGetTimeUnit(isec1);
	  taxis->vdate = vdate;
	  taxis->vtime = vtime;

	  datetime0.date = vdate;
	  datetime0.time = vtime;
	}

      tsteptype = cgribexGetTsteptype(ISEC1_TimeRange);

      if ( ISEC1_AvgNum )
	{
	  if (  taxis->numavg && warn_numavg &&
		(taxis->numavg != ISEC1_AvgNum) )
	    {
	  /*
	      Message(func, "change numavg from %d to %d not allowed!",
		      taxis->numavg, ISEC1_AvgNum);
	  */
	      warn_numavg = FALSE;
	    }
	  else
	    {
	      taxis->numavg = ISEC1_AvgNum;
	    }
	}

      datetime.date  = vdate;
      datetime.time  = vtime;
      compVar.param  = param;
      compVar.level1 = level1;
      compVar.level2 = level2;
      compVar.ltype  = ISEC1_LevelType;
      for ( recID = 0; recID < nrecords; recID++ )
	{
	  compVar0.param  = streamptr->tsteps[tsID].records[recID].param;
	  compVar0.level1 = streamptr->tsteps[tsID].records[recID].ilevel;
	  compVar0.level2 = streamptr->tsteps[tsID].records[recID].ilevel2;
	  compVar0.ltype  = streamptr->tsteps[tsID].records[recID].ltype;

	  if ( memcmp(&compVar0, &compVar, sizeof(compvar_t)) == 0 ) break;
	}

      if ( recID == nrecords )
	{
	  char paramstr[32];
	  cdiParamToString(param, paramstr, sizeof(paramstr));
	  Warning(func, "Param=%s level=%d not defined at timestep 1!", paramstr, level1);
	  return (CDI_EUFSTRUCT);
	}

      if ( cdiInventoryMode == 1 )
	{
	  if ( streamptr->tsteps[tsID].records[recID].used )
	    {
	      break;
	    }
	  else
	    {
	      streamptr->tsteps[tsID].records[recID].used = TRUE;
	      streamptr->tsteps[tsID].recIDs[rindex] = recID;
	    }    
	}
      else
	{