stream_ieg.c 35.2 KB
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#if defined (HAVE_CONFIG_H)
#  include "config.h"
#endif

#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
#include <float.h>
#include <math.h>

#include "dmemory.h"

#include "error.h"
#include "file.h"
#include "cdi.h"
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#include "cdi_int.h"
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#include "varscan.h"
#include "datetime.h"
#include "ieg.h"
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#include "stream_fcommon.h"
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#include "stream_ieg.h"
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#include "vlist.h"


#undef  UNDEFID
#define UNDEFID  CDI_UNDEFID

#define SINGLE_PRECISION  4
#define DOUBLE_PRECISION  8

#if defined (HAVE_LIBIEG)

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typedef struct {
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  int param;
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  int level;
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} IEGCOMPVAR;
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int iegInqDatatype(int prec)
{
  int datatype;

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  if ( prec == DOUBLE_PRECISION ) datatype = DATATYPE_FLT64;
  else                            datatype = DATATYPE_FLT32;
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  return (datatype);
}


int iegDefDatatype(int datatype)
{
  int prec;

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  if ( datatype == DATATYPE_CPX32 || datatype == DATATYPE_CPX64 )
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    Error("CDI/IEG library does not support complex numbers!");
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  if ( datatype != DATATYPE_FLT32 && datatype != DATATYPE_FLT64 )
    datatype = DATATYPE_FLT32;
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  if ( datatype == DATATYPE_FLT64 ) prec = DOUBLE_PRECISION;
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  else                              prec = SINGLE_PRECISION;

  return (prec);
}

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/* not used
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int iegInqRecord(stream_t *streamptr, int *varID, int *levelID)
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{
  int status;
  int fileID;
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  int icode, ilevel;
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  int zaxisID = -1;
  int vlistID;
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  iegrec_t *iegp = (iegrec_t*) streamptr->record->exsep;
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  vlistID = streamptr->vlistID;
  fileID  = streamptr->fileID;
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  *varID   = -1;
  *levelID = -1;

  status = iegRead(fileID, iegp);
  if ( status != 0 ) return (0);

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  icode  = IEG_P_Parameter(iegp->ipdb);
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  if ( IEG_P_LevelType(iegp->ipdb) == IEG_LTYPE_HYBRID_LAYER )
    ilevel = IEG_P_Level1(iegp->ipdb);
  else
    ilevel = IEG_P_Level2(iegp->ipdb);

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  *varID = vlistInqVarID(vlistID, icode);
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  if ( *varID == UNDEFID ) Error("Code %d undefined", icode);
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  zaxisID = vlistInqVarZaxis(vlistID, *varID);

  *levelID = zaxisInqLevelID(zaxisID, (double) ilevel);
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  return (1);
}
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*/
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void iegReadRecord(stream_t *streamptr, double *data, int *nmiss)
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{
  int vlistID, fileID;
  int status;
  int recID, vrecID, tsID;
  off_t recpos;
  int varID, gridID;
  int i, size;
  double missval;
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  iegrec_t *iegp = (iegrec_t*) streamptr->record->exsep;
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  vlistID = streamptr->vlistID;
  fileID  = streamptr->fileID;
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  tsID    = streamptr->curTsID;
  vrecID  = streamptr->tsteps[tsID].curRecID;
  recID   = streamptr->tsteps[tsID].recIDs[vrecID];
  recpos  = streamptr->tsteps[tsID].records[recID].position;
  varID   = streamptr->tsteps[tsID].records[recID].varID;
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  fileSetPos(fileID, recpos, SEEK_SET);

  status = iegRead(fileID, iegp);
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  if ( status != 0 )
    Error("Could not read IEG record!");
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  iegInqDataDP(iegp, data);

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  missval = vlistInqVarMissval(vlistID, varID);
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  gridID  = vlistInqVarGrid(vlistID, varID);
  size    = gridInqSize(gridID);
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  streamptr->numvals += size;
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  *nmiss = 0;
  for ( i = 0; i < size; i++ )
    if ( DBL_IS_EQUAL(data[i], missval) || DBL_IS_EQUAL(data[i], (float)missval) )
      {
	data[i] = missval;
	(*nmiss)++;
      }
}

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int iegGetZaxisType(int iegleveltype)
{
  int leveltype = 0;

  switch ( iegleveltype )
    {
    case IEG_LTYPE_SURFACE:
      {
	leveltype = ZAXIS_SURFACE;
	break;
      }
    case IEG_LTYPE_99:
    case IEG_LTYPE_ISOBARIC:
      {
	leveltype = ZAXIS_PRESSURE;
	break;
      }
    case IEG_LTYPE_HEIGHT:
      {
	leveltype = ZAXIS_HEIGHT;
	break;
      }
    case IEG_LTYPE_ALTITUDE:
      {
	leveltype = ZAXIS_ALTITUDE;
	break;
      }
    case IEG_LTYPE_HYBRID:
    case IEG_LTYPE_HYBRID_LAYER:
      {
	leveltype = ZAXIS_HYBRID;
	break;
      }
    case IEG_LTYPE_LANDDEPTH:
    case IEG_LTYPE_LANDDEPTH_LAYER:
      {
	leveltype = ZAXIS_DEPTH_BELOW_LAND;
	break;
      }
    case IEG_LTYPE_SEADEPTH:
      {
	leveltype = ZAXIS_DEPTH_BELOW_SEA;
	break;
      }
    default:
      {
	leveltype = ZAXIS_GENERIC;
	break;
      }
    }

  return (leveltype);
}


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void iegDefTime(int *pdb, int date, int time, int taxisID)
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{
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  int year, month, day, hour, minute, second;
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  int timetype = -1;

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  if ( taxisID != -1 ) timetype = taxisInqType(taxisID);
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  if ( timetype == TAXIS_ABSOLUTE || timetype == TAXIS_RELATIVE )
    {
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      cdiDecodeDate(date, &year, &month, &day);
      cdiDecodeTime(time, &hour, &minute, &second);
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      IEG_P_Year(pdb)     = year;
      IEG_P_Month(pdb)    = month;
      IEG_P_Day(pdb)      = day;
      IEG_P_Hour(pdb)     = hour;
      IEG_P_Minute(pdb)   = minute;

      pdb[15] = 1;
      pdb[16] = 0;
      pdb[17] = 0;
      pdb[18] = 10;
      pdb[36] = 1;
    }

  pdb[5] = 128;
}

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void iegDefGrid(int *gdb, int gridID)
{
  int gridtype;

  gridtype = gridInqType(gridID);

  if ( gridtype == GRID_GENERIC )
    {
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      int xsize, ysize;

      xsize = gridInqXsize(gridID);
      ysize = gridInqYsize(gridID);

      if ( (ysize == 32  || ysize == 48 || ysize == 64 ||
	    ysize == 96  || ysize == 160) && 
	   (xsize == 2*ysize || xsize == 1) )
	{
	  gridtype = GRID_GAUSSIAN;
	  gridChangeType(gridID, gridtype);
	}
      else if ( (xsize == 1 && ysize == 1) || (xsize == 0 && ysize == 0) )
	{
	  gridtype = GRID_LONLAT;
	  gridChangeType(gridID, gridtype);
	}
      else if ( gridInqXvals(gridID, NULL) && gridInqYvals(gridID, NULL) )
	{
	  gridtype = GRID_LONLAT;
	  gridChangeType(gridID, gridtype);
	}
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    }
  else if ( gridtype == GRID_CURVILINEAR )
    {
      gridtype = GRID_LONLAT;
    }

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  if ( gridtype == GRID_LONLAT || gridtype == GRID_GAUSSIAN )
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    {
      int nlon, nlat;
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      double xfirst = 0, xlast = 0, xinc = 0;
      double yfirst = 0, ylast = 0, yinc = 0;
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      nlon = (int) gridInqXsize(gridID);
      nlat = (int) gridInqYsize(gridID);

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      if ( nlon == 0 )
	{
	  nlon = 1;
	}
      else
	{
	  xfirst = gridInqXval(gridID,      0);
	  xlast  = gridInqXval(gridID, nlon-1);
	  xinc   = gridInqXinc(gridID);
	}

      if ( nlat == 0 )
	{
	  nlat = 1;
	}
      else
	{
	  yfirst = gridInqYval(gridID,      0);
	  ylast  = gridInqYval(gridID, nlat-1);
	  yinc   = gridInqYinc(gridID);
	}

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      if ( gridtype == GRID_GAUSSIAN )
	IEG_G_GridType(gdb) = 4;
      else if ( gridtype == GRID_LONLAT && gridIsRotated(gridID) )
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	IEG_G_GridType(gdb) = 10;
      else
	IEG_G_GridType(gdb) = 0;

      IEG_G_NumLon(gdb)   = nlon;
      IEG_G_NumLat(gdb)   = nlat;
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      IEG_G_FirstLat(gdb) = lround(yfirst*1000);
      IEG_G_LastLat(gdb)  = lround(ylast*1000);
      IEG_G_FirstLon(gdb) = lround(xfirst*1000);
      IEG_G_LastLon(gdb)  = lround(xlast*1000);
      IEG_G_LonIncr(gdb)  = lround(xinc*1000);
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      if ( fabs(xinc*1000 - IEG_G_LonIncr(gdb)) > FLT_EPSILON )
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	IEG_G_LonIncr(gdb) = 0;

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      if ( gridtype == GRID_GAUSSIAN )
	IEG_G_LatIncr(gdb) = nlat/2;
      else
	{
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	  IEG_G_LatIncr(gdb) = lround(yinc*1000);
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	  if ( fabs(yinc*1000 - IEG_G_LatIncr(gdb)) > FLT_EPSILON )
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	    IEG_G_LatIncr(gdb) = 0;
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	  if ( IEG_G_LatIncr(gdb) < 0 ) IEG_G_LatIncr(gdb) = -IEG_G_LatIncr(gdb);
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	}
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      if ( IEG_G_NumLon(gdb) > 1 && IEG_G_NumLat(gdb) == 1 )
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	if ( IEG_G_LonIncr(gdb) != 0 && IEG_G_LatIncr(gdb) == 0 ) IEG_G_LatIncr(gdb) = IEG_G_LonIncr(gdb);

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      if ( IEG_G_NumLon(gdb) == 1 && IEG_G_NumLat(gdb) > 1 )
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	if ( IEG_G_LonIncr(gdb) == 0 && IEG_G_LatIncr(gdb) != 0 ) IEG_G_LonIncr(gdb) = IEG_G_LatIncr(gdb);

      if ( IEG_G_LatIncr(gdb) == 0 || IEG_G_LonIncr(gdb) == 0 )
	IEG_G_ResFlag(gdb) = 0;
      else
	IEG_G_ResFlag(gdb) = 128;

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      if ( gridIsRotated(gridID) )
	{
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	  IEG_G_LatSP(gdb) = - lround(gridInqYpole(gridID) * 1000);
	  IEG_G_LonSP(gdb) =   lround((gridInqXpole(gridID) + 180) * 1000);
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	  IEG_G_Size(gdb)  = 42;
	}
      else
	{
	  IEG_G_Size(gdb)  = 32;
	}
    }
  else
    {
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      Error("Unsupported grid type: %s", gridNamePtr(gridtype));
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    }

  IEG_G_ScanFlag(gdb) = 64;
}

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void iegDefLevel(int *pdb, int *gdb, double *vct, int zaxisID, int levelID)
{
  double level;
  int ilevel, leveltype;
  static int warning = 1;
  static int vct_warning = 1;

  leveltype = zaxisInqType(zaxisID);

  if ( leveltype == ZAXIS_GENERIC )
    {
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      Message("Changed zaxis type from %s to %s",
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	      zaxisNamePtr(leveltype),
	      zaxisNamePtr(ZAXIS_PRESSURE));
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      leveltype = ZAXIS_PRESSURE;
      zaxisChangeType(zaxisID, leveltype);
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      zaxisDefUnits(zaxisID, "Pa");
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    }

  /*  IEG_G_NumVCP(gdb) = 0; */

  switch (leveltype)
    {
    case ZAXIS_SURFACE:
      {
	IEG_P_LevelType(pdb) = IEG_LTYPE_SURFACE;
	IEG_P_Level1(pdb)    = 0;
	IEG_P_Level2(pdb)    = (int) zaxisInqLevel(zaxisID, levelID);
	break;
      }
    case ZAXIS_HYBRID:
      {
	int vctsize;

	if ( zaxisInqLbounds(zaxisID, NULL) && zaxisInqUbounds(zaxisID, NULL) )
	  {
	    IEG_P_LevelType(pdb) = IEG_LTYPE_HYBRID_LAYER;
	    IEG_P_Level1(pdb)    = (int) zaxisInqLbound(zaxisID, levelID);
	    IEG_P_Level2(pdb)    = (int) zaxisInqUbound(zaxisID, levelID);
	  }
	else
	  {
	    IEG_P_LevelType(pdb) = IEG_LTYPE_HYBRID;
	    IEG_P_Level1(pdb)    = 0;
	    IEG_P_Level2(pdb)    = (int) zaxisInqLevel(zaxisID, levelID);
	  }

	vctsize = zaxisInqVctSize(zaxisID);
	if ( vctsize == 0 && warning )
	  {
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	    Warning("VCT missing. ( code = %d, zaxisID = %d )",
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		    IEG_P_Parameter(pdb), zaxisID);
	    warning = 0;
	  }
	if ( vctsize > 100 )
	  {
	    /*	    IEG_G_NumVCP(gdb) = 0; */
	    if ( vct_warning )
	      {
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		Warning("VCT size of %d is too large (maximum is 100). Set to 0!", vctsize);
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		vct_warning = 0;
	      }
	  }
	else
	  {
	    IEG_G_Size(gdb) += (vctsize*4);
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	    memcpy(vct, zaxisInqVctPtr(zaxisID), (size_t)vctsize/2*sizeof(double));
	    memcpy(vct+50, zaxisInqVctPtr(zaxisID)+vctsize/2, (size_t)vctsize/2*sizeof(double));
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	  }
	break;
      }
    case ZAXIS_PRESSURE:
      {
	double dum;
	char units[128];

	level = zaxisInqLevel(zaxisID, levelID);
	if ( level < 0 )
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	  Warning("pressure level of %f Pa is below 0.", level);
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	zaxisInqUnits(zaxisID, units);
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	if ( memcmp(units, "hPa", 3) == 0 || memcmp(units, "mb",2 ) == 0 )
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	  level = level*100;

	ilevel = (int) level;
	if ( level < 32768 && (level < 100 || modf(level/100, &dum) > 0) )
	  {
	    IEG_P_LevelType(pdb) = IEG_LTYPE_99;
	    IEG_P_Level1(pdb)    = 0;
	    IEG_P_Level2(pdb)    = ilevel;
	  }
	else
	  {
	    IEG_P_LevelType(pdb) = IEG_LTYPE_ISOBARIC;
	    IEG_P_Level1(pdb)    = 0;
	    IEG_P_Level2(pdb)    = ilevel/100;
	  }
	break;
      }
    case ZAXIS_HEIGHT:
      {
	level = zaxisInqLevel(zaxisID, levelID);

	ilevel = (int) level;
	IEG_P_LevelType(pdb) = IEG_LTYPE_HEIGHT;
	IEG_P_Level1(pdb)    = 0;
	IEG_P_Level2(pdb)    = ilevel;

	break;
      }
    case ZAXIS_ALTITUDE:
      {
	level = zaxisInqLevel(zaxisID, levelID);

	ilevel = (int) level;
	IEG_P_LevelType(pdb) = IEG_LTYPE_ALTITUDE;
	IEG_P_Level1(pdb)    = 0;
	IEG_P_Level2(pdb)    = ilevel;

	break;
      }
    case ZAXIS_DEPTH_BELOW_LAND:
      {
	if ( zaxisInqLbounds(zaxisID, NULL) && zaxisInqUbounds(zaxisID, NULL) )
	  {
	    IEG_P_LevelType(pdb) = IEG_LTYPE_LANDDEPTH_LAYER;
	    IEG_P_Level1(pdb)    = (int) zaxisInqLbound(zaxisID, levelID);
	    IEG_P_Level2(pdb)    = (int) zaxisInqUbound(zaxisID, levelID);
	  }
	else
	  {
	    level = zaxisInqLevel(zaxisID, levelID);

	    ilevel = (int) level;
	    IEG_P_LevelType(pdb) = IEG_LTYPE_LANDDEPTH;
	    IEG_P_Level1(pdb)    = 0;
	    IEG_P_Level2(pdb)    = ilevel;
	  }

	break;
      }
    case ZAXIS_DEPTH_BELOW_SEA:
      {
	level = zaxisInqLevel(zaxisID, levelID);

	ilevel = (int) level;
	IEG_P_LevelType(pdb) = IEG_LTYPE_SEADEPTH;
	IEG_P_Level1(pdb)    = 0;
	IEG_P_Level2(pdb)    = ilevel;

	break;
      }
    case ZAXIS_ISENTROPIC:
      {
	level = zaxisInqLevel(zaxisID, levelID);

	ilevel = (int) level;
	IEG_P_LevelType(pdb) = 113;
	IEG_P_Level1(pdb)    = 0;
	IEG_P_Level2(pdb)    = ilevel;

	break;
      }
    default:
      {
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	Error("Unsupported zaxis type: %s", zaxisNamePtr(leveltype));
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	break;
      }
    }
}


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void iegCopyRecord(stream_t *streamptr2, stream_t *streamptr1)
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{
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  streamFCopyRecord(streamptr2, streamptr1, "IEG");
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}


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void iegDefRecord(stream_t *streamptr)
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{
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  int vlistID;
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  int gridID;
  int date, time;
  int datatype;
  int i;
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  int param, pdis, pcat, pnum;
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  int varID, levelID, tsID, zaxisID;
  int byteorder;
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  iegrec_t *iegp = (iegrec_t*) streamptr->record->exsep;
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  vlistID = streamptr->vlistID;
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  byteorder = streamptr->byteorder;
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  varID   = streamptr->record->varID;
  levelID = streamptr->record->levelID;
  tsID    = streamptr->curTsID;
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  gridID  = vlistInqVarGrid(vlistID, varID);
  zaxisID = vlistInqVarZaxis(vlistID, varID);
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  iegInitMem(iegp);
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  for ( i = 0; i < 37; i++ ) iegp->ipdb[i] = -1;

  iegp->byteswap = getByteswap(byteorder);

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  param =  vlistInqVarParam(vlistID, varID);
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  cdiDecodeParam(param, &pnum, &pcat, &pdis);
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  IEG_P_Parameter(iegp->ipdb) = pnum;
  if ( pdis == 255 ) IEG_P_CodeTable(iegp->ipdb) = pcat;
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  date     = streamptr->tsteps[tsID].taxis.vdate;
  time     = streamptr->tsteps[tsID].taxis.vtime;
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  iegDefTime(iegp->ipdb, date, time, vlistInqTaxis(vlistID));
  iegDefGrid(iegp->igdb, gridID);
  iegDefLevel(iegp->ipdb, iegp->igdb, iegp->vct, zaxisID, levelID);

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  datatype = streamptr->record->prec;
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  iegp->dprec = iegDefDatatype(datatype);
}


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void iegWriteRecord(stream_t *streamptr, const double *data)
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{
  int fileID;
  int i, gridsize, gridID;
  double refval;
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  iegrec_t *iegp = (iegrec_t*) streamptr->record->exsep;
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  fileID = streamptr->fileID;
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  gridID = streamptr->record->gridID;
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  gridsize = gridInqSize(gridID);

  refval = data[0];
  for ( i = 1; i < gridsize; i++ )
    if ( data[i] < refval ) refval = data[i];

  iegp->refval = refval;

  iegDefDataDP(iegp, data);

  iegWrite(fileID, iegp);
}

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static
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void iegAddRecord(stream_t *streamptr, int param, int *pdb, int *gdb, double *vct,
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		  long recsize, off_t position, int prec)
{
  int leveltype;
  int gridID = UNDEFID;
  int levelID = 0;
  int tsID, recID, varID;
  int datatype;
  int level1, level2;
  int gridtype;
  int lbounds = 0;
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  record_t *record;
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  grid_t grid;
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  int vlistID;

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  vlistID = streamptr->vlistID;
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  tsID    = streamptr->curTsID;
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  recID   = recordNewEntry(streamptr, tsID);
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  record  = &streamptr->tsteps[tsID].records[recID];
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  if ( IEG_P_LevelType(pdb) == IEG_LTYPE_HYBRID_LAYER )
    {
      level1 = IEG_P_Level1(pdb);
      level2 = IEG_P_Level2(pdb);
    }
  else
    {
      level1 = IEG_P_Level2(pdb);
      level2 = 0;
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      if ( IEG_P_LevelType(pdb) == 100 ) level1 *= 100;
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    }
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  (*record).size     = recsize;
  (*record).position = position;
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  (*record).param    = param;
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  (*record).ilevel   = level1;
  (*record).ilevel2  = level2;
  (*record).ltype    = IEG_P_LevelType(pdb);

  if ( IEG_G_GridType(gdb) == 0 || IEG_G_GridType(gdb) == 10 )
    gridtype = GRID_LONLAT;
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  else if ( IEG_G_GridType(gdb) == 4 )
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    gridtype = GRID_GAUSSIAN;
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  else
    gridtype = GRID_GENERIC;

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  memset(&grid, 0, sizeof(grid_t));
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  grid.type  = gridtype; 
  grid.size  = IEG_G_NumLon(gdb)*IEG_G_NumLat(gdb);
  grid.xsize = IEG_G_NumLon(gdb);
  grid.ysize = IEG_G_NumLat(gdb);
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  grid.xinc  = 0;
  grid.yinc  = 0;
  grid.xdef  = 0;
  /* if ( IEG_G_FirstLon != 0 || IEG_G_LastLon != 0 ) */
  {
    if ( grid.xsize > 1 )
      {
	if ( IEG_G_ResFlag(gdb) && IEG_G_LonIncr(gdb) > 0 )
	  grid.xinc = IEG_G_LonIncr(gdb) * 0.001;
	else
	  grid.xinc = (IEG_G_LastLon(gdb) - IEG_G_FirstLon(gdb)) * 0.001 / (grid.xsize - 1);

	/* correct xinc if necessary */
	if ( IEG_G_FirstLon(gdb) == 0 && IEG_G_LastLon(gdb) > 354000 )
	  {
	    double xinc = 360. / grid.xsize;
	    
	    if ( fabs(grid.xinc-xinc) > 0.0 )
	      {
		grid.xinc = xinc;
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		if ( CDI_Debug ) Message("set xinc to %g", grid.xinc);
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	      }
	  }
      }
    grid.xfirst = IEG_G_FirstLon(gdb) * 0.001;
    grid.xlast  = IEG_G_LastLon(gdb)  * 0.001;
    grid.xdef   = 2;	    
  }
  grid.ydef  = 0;
  /* if ( IEG_G_FirstLat != 0 || IEG_G_LastLat != 0 ) */
  {
    if ( grid.ysize > 1 )
      {
	if ( IEG_G_ResFlag(gdb) && IEG_G_LatIncr(gdb) > 0 )
	  grid.yinc = IEG_G_LatIncr(gdb) * 0.001;
	else
	  grid.yinc = (IEG_G_LastLat(gdb) - IEG_G_FirstLat(gdb)) * 0.001 / (grid.ysize - 1);
      }
    grid.yfirst = IEG_G_FirstLat(gdb) * 0.001;
    grid.ylast  = IEG_G_LastLat(gdb)  * 0.001;
    grid.ydef   = 2;	    
  }
  /*
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  grid.xfirst= IEG_G_FirstLon(gdb) * 0.001;
  grid.xlast = IEG_G_LastLon(gdb) * 0.001;
  grid.xinc  = IEG_G_LonIncr(gdb) * 0.001;
  grid.xdef  = 2;	    
  grid.yfirst= IEG_G_FirstLat(gdb) * 0.001;
  grid.ylast = IEG_G_LastLat(gdb) * 0.001;
  grid.yinc  = IEG_G_LatIncr(gdb) * 0.001;
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  grid.ydef  = 2;
  */
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  grid.xvals = NULL;
  grid.yvals = NULL;

  grid.isRotated = FALSE;
  if ( IEG_G_GridType(gdb) == 10 )
    {
      grid.isRotated = TRUE;
      grid.ypole     = - IEG_G_LatSP(gdb) * 0.001;
      grid.xpole     =   IEG_G_LonSP(gdb) * 0.001 - 180;
      grid.angle     = 0;
    }

  gridID = varDefGrid(vlistID, grid, 0);

  leveltype = iegGetZaxisType(IEG_P_LevelType(pdb));
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  if ( leveltype == ZAXIS_HYBRID )
    {
      int i;
      double tmpvct[100];
      int vctsize = IEG_G_NumVCP(gdb);

      for ( i = 0; i < vctsize/2; i++ ) tmpvct[i] = vct[i];
      for ( i = 0; i < vctsize/2; i++ ) tmpvct[i+vctsize/2] = vct[i+50];

      varDefVCT(vctsize, tmpvct);
    }

  if ( IEG_P_LevelType(pdb) == IEG_LTYPE_HYBRID_LAYER ) lbounds = 1;

  datatype = iegInqDatatype(prec);

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  varAddRecord(recID, param, gridID, leveltype, lbounds, level1, level2, 0, 0,
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	       datatype, &varID, &levelID, TSTEP_INSTANT, 0, 0, NULL, NULL, NULL, NULL);
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  (*record).varID   = varID;
  (*record).levelID = levelID;

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  streamptr->tsteps[tsID].nallrecs++;
  streamptr->nrecs++;
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  if ( CDI_Debug )
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    Message("varID = %d gridID = %d levelID = %d",
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	    varID, gridID, levelID);
}

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#if 0
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static
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void iegCmpRecord(stream_t *streamptr, int tsID, int recID, off_t position, int param,
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		  int level, int xsize, int ysize)
{
  int varID = 0;
  int levelID = 0;
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  record_t *record;
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  record  = &streamptr->tsteps[tsID].records[recID];
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  if ( param != (*record).param || level != (*record).ilevel )
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    Error("inconsistent timestep");
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  (*record).position = position;
  /*
  varID   = (*record).varID;
  levelID = (*record).levelID;

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  streamptr->vars[varID].level[levelID] = recID;
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  streamptr->tsteps[tsID].nallrecs++;
  streamptr->nrecs++;
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  */
  if ( CDI_Debug )
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    Message("varID = %d levelID = %d", varID, levelID);
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}
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#endif
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void iegDateTime(int *pdb, int *date, int *time)
{
  int ryear, rmonth, rday, rhour, rminute;

  ryear   = IEG_P_Year(pdb);

  rmonth  = IEG_P_Month(pdb);
  rday    = IEG_P_Day(pdb);

  rhour   = IEG_P_Hour(pdb);
  rminute = IEG_P_Minute(pdb);

  if ( rminute == -1 ) rminute = 0;

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  *date = cdiEncodeDate(ryear, rmonth, rday);
  *time = cdiEncodeTime(rhour, rminute, 0);
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}

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static
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void iegScanTimestep1(stream_t *streamptr)
{
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  int prec = 0;
  int status;
  int fileID;
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  int tabnum;
  int param = 0;
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  int rcode = 0, rlevel = 0, vdate = 0, vtime = 0;
  DateTime datetime, datetime0;
  int tsID;
  int varID;
  long recsize;
  off_t recpos;
  int nrecords, nrecs, recID;
  int taxisID = -1;
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  taxis_t *taxis;
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  int vlistID;
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  IEGCOMPVAR compVar, compVar0;
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  iegrec_t *iegp = (iegrec_t*) streamptr->record->exsep;
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  streamptr->curTsID = 0;
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  tsID  = tstepsNewEntry(streamptr);
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  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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  fileID = streamptr->fileID;
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  nrecs = 0;
  while ( TRUE )
    {
      recpos = fileGetPos(fileID);
      status = iegRead(fileID, iegp);
      if ( status != 0 )
	{
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	  streamptr->ntsteps = 1;
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	  break;
	}
      recsize = fileGetPos(fileID) - recpos;

      prec   = iegp->dprec;
      rcode  = IEG_P_Parameter(iegp->ipdb);
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      tabnum = IEG_P_CodeTable(iegp->ipdb);
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      param  = cdiEncodeParam(rcode, tabnum, 255);
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      if ( IEG_P_LevelType(iegp->ipdb) == IEG_LTYPE_HYBRID_LAYER )
	rlevel = IEG_P_Level1(iegp->ipdb);
      else
	rlevel = IEG_P_Level2(iegp->ipdb);

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      if ( IEG_P_LevelType(iegp->ipdb) == 100 ) rlevel *= 100;

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      iegDateTime(iegp->ipdb, &vdate, &vtime);

      if ( nrecs == 0 )
	{
	  datetime0.date = vdate;
	  datetime0.time = vtime;
	}
      else
	{
	  datetime.date = vdate;
	  datetime.time = vtime;
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	  compVar.param = param;
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          compVar.level = rlevel;
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	  for ( recID = 0; recID < nrecs; recID++ )
	    {
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	      compVar0.param = streamptr->tsteps[0].records[recID].param;
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	      compVar0.level = streamptr->tsteps[0].records[recID].ilevel;

	      if ( memcmp(&compVar0, &compVar, sizeof(IEGCOMPVAR)) == 0 ) break;
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	    }
	  if ( recID < nrecs ) break;
	  if ( memcmp(&datetime, &datetime0, sizeof(DateTime)) )
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	    Warning("Inconsistent verification time for param %d level %d", param, rlevel);
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	}

      nrecs++;

      if ( CDI_Debug )
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	Message("%4d%8d%4d%8d%8d%6d", nrecs, (int)recpos, param, rlevel, vdate, vtime);
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      iegAddRecord(streamptr, param, iegp->ipdb, iegp->igdb, iegp->vct, recsize, recpos, prec);
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    }

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  streamptr->rtsteps = 1;
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  cdi_generate_vars(streamptr);
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  taxisID = taxisCreate(TAXIS_ABSOLUTE);
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  taxis->type  = TAXIS_ABSOLUTE;
  taxis->vdate = datetime0.date;
  taxis->vtime = datetime0.time;

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  vlistID = streamptr->vlistID;
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  vlistDefTaxis(vlistID, taxisID);

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  vlist_check_contents(vlistID);
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  nrecords = streamptr->tsteps[0].nallrecs;
  if ( nrecords < streamptr->tsteps[0].recordSize )
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    {
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      streamptr->tsteps[0].recordSize = nrecords;
      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));
  streamptr->tsteps[0].nrecs = nrecords;
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  for ( recID = 0; recID < nrecords; recID++ )
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    streamptr->tsteps[0].recIDs[recID] = recID;
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  if ( streamptr->ntsteps == -1 )
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    {
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      tsID = tstepsNewEntry(streamptr);
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      if ( tsID != streamptr->rtsteps )
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	Error("Internal error. tsID = %d", tsID);
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      streamptr->tsteps[tsID-1].next   = TRUE;
      streamptr->tsteps[tsID].position = recpos;
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    }

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

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static
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int iegScanTimestep2(stream_t *streamptr)
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{
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  int status;
  int fileID;
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  int tabnum;
  int param = 0;
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  int rcode = 0, rlevel = 0, vdate = 0, vtime = 0;
  int tsID;
  int varID;
  long recsize;
  off_t recpos = 0;
  int nrecords, nrecs, recID, rindex;
  int nextstep;
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  taxis_t *taxis;
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  int vlistID;
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  IEGCOMPVAR compVar, compVar0;
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  iegrec_t *iegp = (iegrec_t*) streamptr->record->exsep;
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  streamptr->curTsID = 1;
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  vlistID = streamptr->vlistID;
  fileID  = streamptr->fileID;
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  tsID = streamptr->rtsteps;
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  if ( tsID != 1 )
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    Error("Internal problem! unexpeceted timestep %d", tsID+1);
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  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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  nrecords = streamptr->tsteps[0].nallrecs;
  streamptr->tsteps[1].recIDs = (int *) malloc(nrecords*sizeof(int));
  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 =
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	streamptr->tsteps[0].records[recID].position;
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      streamptr->tsteps[tsID].records[recID].size     =
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	streamptr->tsteps[0].records[recID].size;
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    }

  for ( rindex = 0; rindex <= nrecords; rindex++ )
    {
      recpos = fileGetPos(fileID);
      status = iegRead(fileID, iegp);
      if ( status != 0 )
	{
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	  streamptr->ntsteps = 2;
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	  break;
	}
      recsize = fileGetPos(fileID) - recpos;

      rcode  = IEG_P_Parameter(iegp->ipdb);
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      tabnum = IEG_P_CodeTable(iegp->ipdb);
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      param  = cdiEncodeParam(rcode, tabnum, 255);
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