} // end scan
/// <summary> scans a Grib file to gather information that could be used to
/// create an index or dump the metadata contents.
///
/// </summary>
/// <param name="getProducts">products have enough information for data extractions
/// </param>
/// <param name="oneRecord">returns after processing one record in the Grib file
/// </param>
/// <throws> NotSupportedException </throws>
public IEnumerable <Grib1Record> scanRecords()
{
InputStream.Seek(0, SeekOrigin.Begin);
// stores the number of times a particular GDS is used
//UPGRADE_TODO: Class 'java.util.HashMap' was converted to 'System.Collections.Hashtable' which has a different behavior. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1073_javautilHashMap'"
System.Collections.Hashtable gdsCounter = new System.Collections.Hashtable();
Grib1ProductDefinitionSection pds = null;
Grib1GridDefinitionSection gds = null;
long startOffset = -1;
while (InputStream.Position < InputStream.Length)
{
if (seekHeader(InputStream, InputStream.Length, out startOffset))
{
// Read Section 0 Indicator Section
Grib1IndicatorSection is_Renamed = new Grib1IndicatorSection(InputStream);
// EOR (EndOfRecord) calculated so skipping data sections is faster
long EOR = InputStream.Position + is_Renamed.GribLength - is_Renamed.Length;
// Read Section 1 Product Definition Section PDS
pds = new Grib1ProductDefinitionSection(InputStream);
if (pds.LengthErr)
{
continue;
}
if (pds.gdsExists())
{
// Read Section 2 Grid Definition Section GDS
gds = new Grib1GridDefinitionSection(InputStream);
}
else
{
// GDS doesn't exist so make one
gds = (Grib1GridDefinitionSection) new Grib1Grid(pds);
}
// obtain BMS or BDS offset in the file for this product
long dataOffset;
if (pds.Center == 98)
{
// check for ecmwf offset by 1 bug
int length = (int)GribNumbers.uint3(InputStream); // should be length of BMS
if ((length + InputStream.Position) < EOR)
{
dataOffset = InputStream.Position - 3; // ok
}
else
{
dataOffset = InputStream.Position - 2;
}
}
else
{
dataOffset = InputStream.Position;
}
// position filePointer to EndOfRecord
InputStream.Seek(EOR, System.IO.SeekOrigin.Begin);
// assume scan ok
Grib1Record gr = new Grib1Record(header, is_Renamed, pds, gds, dataOffset, InputStream.Position, startOffset);
var currentPosition = InputStream.Position;
yield return(gr);
InputStream.Position = currentPosition;
// early return because ending "7777" missing
if (InputStream.Position > InputStream.Length)
{
InputStream.Seek(0, System.IO.SeekOrigin.Begin);
checkGDSkeys(gds, gdsCounter);
throw new BadGribFormatException("Grib1Input: GRIB ending missing. Possible file corruption");
}
} // end if seekHeader
} // end while raf.Position < raf.Length
checkGDSkeys(gds, gdsCounter);
} // end scan
/// <summary> scans a Grib file to gather information that could be used to
/// create an index or dump the metadata contents.
///
/// </summary>
/// <param name="getProducts">products have enough information for data extractions
/// </param>
/// <param name="oneRecord">returns after processing one record in the Grib file
/// </param>
/// <throws> NotSupportedException </throws>
public void scan(bool getProducts, bool oneRecord)
{
long start = (DateTime.Now.Ticks - 621355968000000000) / 10000;
// stores the number of times a particular GDS is used
//UPGRADE_TODO: Class 'java.util.HashMap' was converted to 'System.Collections.Hashtable' which has a different behavior. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1073_javautilHashMap'"
System.Collections.Hashtable gdsCounter = new System.Collections.Hashtable();
Grib1ProductDefinitionSection pds = null;
Grib1GridDefinitionSection gds = null;
long startOffset = -1;
while (InputStream.Position < InputStream.Length)
{
if (seekHeader(InputStream, InputStream.Length, out startOffset))
{
// Read Section 0 Indicator Section
Grib1IndicatorSection is_Renamed = new Grib1IndicatorSection(InputStream);
// EOR (EndOfRecord) calculated so skipping data sections is faster
long EOR = InputStream.Position + is_Renamed.GribLength - is_Renamed.Length;
// Read Section 1 Product Definition Section PDS
pds = new Grib1ProductDefinitionSection(InputStream);
if (pds.LengthErr)
{
continue;
}
if (pds.gdsExists())
{
// Read Section 2 Grid Definition Section GDS
gds = new Grib1GridDefinitionSection(InputStream);
}
else
{
// GDS doesn't exist so make one
gds = (Grib1GridDefinitionSection) new Grib1Grid(pds);
}
// obtain BMS or BDS offset in the file for this product
long dataOffset = 0;
if (pds.Center == 98)
{
// check for ecmwf offset by 1 bug
int length = (int)GribNumbers.uint3(InputStream); // should be length of BMS
if ((length + InputStream.Position) < EOR)
{
dataOffset = InputStream.Position - 3; // ok
}
else
{
dataOffset = InputStream.Position - 2;
}
}
else
{
dataOffset = InputStream.Position;
}
// position filePointer to EndOfRecord
InputStream.Seek(EOR, System.IO.SeekOrigin.Begin);
// assume scan ok
if (getProducts)
{
Grib1Product gp = new Grib1Product(header, pds, getGDSkey(gds, gdsCounter), dataOffset, InputStream.Position);
products.Add(gp);
}
else
{
Grib1Record gr = new Grib1Record(header, is_Renamed, pds, gds, dataOffset, InputStream.Position, startOffset);
records.Add(gr);
}
if (oneRecord)
{
return;
}
// early return because ending "7777" missing
if (InputStream.Position > InputStream.Length)
{
InputStream.Seek(0, System.IO.SeekOrigin.Begin);
Console.Error.WriteLine("Grib1Input: possible file corruption");
checkGDSkeys(gds, gdsCounter);
return;
}
} // end if seekHeader
} // end while raf.Position < raf.Length
// (System.currentTimeMillis()- start) + " milliseconds");
checkGDSkeys(gds, gdsCounter);
return;
} // end scan