grib_v2_record.h

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/**********************************************************************
zyGrib: meteorological GRIB file viewer
Copyright (C) 2008 - Jacques Zaninetti - http://www.zygrib.org
 
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
 
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
 
You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
***********************************************************************/
 
#ifndef GRIBV2RECORD_H
#define GRIBV2RECORD_H
 
#include <iostream>
#include <cmath>
 
#include "zu_file.h"
#include "grib_record.h"
 
class GRIBMessage;
 
//----------------------------------------------
class GribV2Record : public GribRecord {
public:
  GribV2Record(ZUFILE* file, int id_);
  GribV2Record(const GribRecord& rec);
  GribV2Record() { grib_msg = nullptr; }
 
  ~GribV2Record() override;
 
  // return a new record for next data set
  GribV2Record* GribV2NextDataSet(ZUFILE* file, int id_);
  bool hasMoreDataSet() const;
 
private:
  zuint periodSeconds(zuchar unit, zuint P1, zuint P2, zuchar range);
  void readDataSet(ZUFILE* file);
  class GRIBMessage* grib_msg;
 
  //-----------------------------------------
  void translateDataType();  // adapte les codes des différents centres météo
 
  //---------------------------------------------
  // SECTION 0: THE INDICATOR SECTION (IS)
  //---------------------------------------------
  zuint fileOffset0;
  zuint seekStart, totalSize;
  // zuchar edition_number;
  bool b_len_add_8;
 
  // SECTION 1: THE PRODUCT DEFINITION SECTION (PDS)
  zuint fileOffset1;
  zuint sectionSize1;
  zuchar tableVersion;
  zuchar data1[28];
  bool hasGDS;
  // bool   hasBMS;
  double decimalFactorD;
  // SECTION 2: THE GRID DESCRIPTION SECTION (GDS)
  zuint fileOffset2;
  zuint sectionSize2;
  // SECTION 3: BIT MAP SECTION (BMS)
  zuint fileOffset3;
  zuint sectionSize3;
  // zuchar *bms_bits;
  // SECTION 4: BINARY DATA SECTION (BDS)
  int productTemplate;
  int productDiscipline;
  int gridTemplateNum;
  int dataCat;
  int dataNum;
 
  zuint fileOffset4;
  zuint sectionSize4;
  zuchar unusedBitsEndBDS;
  bool isGridData;  // not spherical harmonics
  bool isSimplePacking;
  bool isFloatValues;
  int scaleFactorE;
  double scaleFactorEpow2;
  double refValue;
  zuint nbBitsInPack;
  // SECTION 5: END SECTION (ES)
 
  //---------------------------------------------
  // Data Access
  //---------------------------------------------
  bool readGribSection0_IS(ZUFILE* file, bool b_skip_initial_GRIB);
};
 
#endif