public GRIB2Record(int disciplineNo, IGRIB2GridDefinitionSection gds, IGRIB2ProductDefinitionSection pds, IGRIB2DataRepresentationSection drs, IGribBitMapSection bms, GRIB2DataSection ds, long gdsOffset, long pdsOffset, long dataOffset)
{
_gdsOffset = gdsOffset;
_pdsOffset = pdsOffset;
_dataOffset = dataOffset;
_gds = gds;
_pds = pds;
_drs = drs;
_bms = bms;
_ds = ds;
_parameter = ParametersFactory.GetParameter(disciplineNo, pds.ParameterCategory, pds.ParameterNumber);
}
private void ReadToDataProvider()
{
if (string.IsNullOrEmpty(_fileName) || !File.Exists(_fileName))
{
return;
}
long gdsOffset = 0; // GDS offset from start of file
bool startAtHeader = true; // otherwise skip to GDS
bool processGDS = true;
FileStream _fs = new FileStream(_fileName, FileMode.Open, FileAccess.Read);
GRIB2IndicatorSection iSection = null;
GRIB2IdentificationSection idSection = null;
GRIB2LocalUseSection lus = null;
GRIB2GridDefinitionSection gds = null;
while (_fs.Position < _fs.Length)
{
if (startAtHeader)
{
// begining of record
if (!SeekHeader(_fs, _fs.Length))
{
goto setAttributes;
}
// Read Section 0 Indicator Section
iSection = new GRIB2IndicatorSection(_fs); // section 0
_discipline = iSection.Displine;
// Read other Sections
idSection = new GRIB2IdentificationSection(_fs); // Section 1
_referenceTime = idSection.ReferenceTime;
} // end startAtHeader
if (processGDS)
{
// check for Local Use Section 2
lus = new GRIB2LocalUseSection(_fs);
// obtain GDS offset in the file for this record
gdsOffset = _fs.Position;
// Section 3
gds = new GRIB2GridDefinitionSection(_fs);
}
// obtain PDS offset in the file for this record
long pdsOffset = _fs.Position;
IGRIB2ProductDefinitionSection pds = new GRIB2ProductDefinitionSection(_fs); // Section 4
IGRIB2DataRepresentationSection drs = new GRIB2DataRepresentationSection(_fs); // Section 5
IGribBitMapSection bms = new GRIB2BitMapSection(_fs, gds.PointsNumber); // Section 6
long dataOffset = _fs.Position + 5;
GRIB2DataSection ds = new GRIB2DataSection(_fs, dataOffset); //Section 7
GRIB2Record record = new GRIB2Record(iSection.Displine, gds, pds, drs, bms, ds, gdsOffset, pdsOffset, dataOffset);
_records.Add(record);
_parameterList.Add(record.ParameterName);
if (_fs.Position > _fs.Length)
{
_fs.Seek(0, System.IO.SeekOrigin.Begin);
goto setAttributes;
}
int ending = GribNumberHelper.Int4(_fs);
if (ending == 926365495)
{
// record ending string 7777 as a number
startAtHeader = true;
processGDS = true;
}
else
{
//_fs.Seek(4, SeekOrigin.Current);
int section = _fs.ReadByte(); // check if GDS or PDS section, 3 or 4
//reset back to begining of section
_fs.Seek(_fs.Position - 5, System.IO.SeekOrigin.Begin);
if (section == 3)
{
startAtHeader = false;
processGDS = true;
}
else if (section == 4)
{
startAtHeader = false;
processGDS = false;
}
else
{
GribEndSection es = new GribEndSection(_fs);
if (es.IsEndFound)
{
startAtHeader = true;
processGDS = true;
}
else
{
goto setAttributes;
}
}
}
}
setAttributes:
SetAttribute(gds);
}
