/// <summary> scans the Grib2 file obtaining Products or Records that contain all
/// needed information for data extraction later. For most purposes,
/// getProductsOnly should be set to true, it's lightweight of getRecords.
/// </summary>
/// <param name="getProductsOnly">
/// </param>
/// <param name="oneRecord">
/// </param>
/// <returns> success
/// </returns>
/// <throws> NotSupportedException </throws>
/// <throws> IOException </throws>
public bool scan(bool getProductsOnly, bool oneRecord)
{
if (raf == null)
{
throw new ApplicationException("Grib2Input.scan called without file");
}
long start = (System.DateTime.Now.Ticks - 621355968000000000) / 10000;
Grib2IndicatorSection is_Renamed = null;
Grib2IdentificationSection id = null;
Grib2LocalUseSection lus = null;
Grib2GridDefinitionSection gds = null;
// if raf.getFilePointer() != 0 then called from Grib2IndexExtender
if (raf.Position > 4)
{
raf.Seek(raf.Position - 4, System.IO.SeekOrigin.Begin);
Grib2EndSection es = new Grib2EndSection(raf);
if (!es.EndFound)
{
// ending found somewhere in file
throw new NoValidGribException("Grib2Input.scan failed to find end of record");
}
//System.out.println( "Scan succeeded to find end of record");
}
//System.out.println("Scan file pointer =" + raf.getFilePointer());
long GdsOffset = 0; // GDS offset from start of file
bool startAtHeader = true; // otherwise skip to GDS
bool processGDS = true;
while (raf.Position < raf.Length)
{
if (startAtHeader)
{
// begining of record
if (!seekHeader(raf, raf.Length))
{
//System.out.println( "Scan seekHeader failed" );
throw new NoValidGribException("Grib2Input.scan failed to find header");
}
// Read Section 0 Indicator Section
is_Renamed = new Grib2IndicatorSection(raf); // section 0
//System.out.println( "Grib record length=" + is.getGribLength());
// Read other Sections
id = new Grib2IdentificationSection(raf); // Section 1
} // end startAtHeader
if (processGDS)
{
// check for Local Use Section 2
lus = new Grib2LocalUseSection(raf);
// obtain GDS offset in the file for this record
GdsOffset = raf.Position;
// Section 3
gds = new Grib2GridDefinitionSection(raf, getProductsOnly);
//System.out.println( "GDS length=" + gds.getLength() );
} // end processGDS
// obtain PDS offset in the file for this record
long PdsOffset = raf.Position;
Grib2ProductDefinitionSection pds = new Grib2ProductDefinitionSection(raf); // Section 4
Grib2DataRepresentationSection drs = null;
Grib2BitMapSection bms = null;
Grib2DataSection ds = null;
drs = new Grib2DataRepresentationSection(raf); // Section 5
bms = new Grib2BitMapSection(raf, gds); // Section 6
//ds = new Grib2DataSection( getData, raf, gds, drs, bms ); //Section 7
ds = new Grib2DataSection(false, raf, gds, drs, bms); //Section 7
// assume scan ok
if (getProductsOnly)
{
Grib2Product gp = new Grib2Product(header, is_Renamed, id, getGDSkey(gds), pds, GdsOffset, PdsOffset);
products.Add(gp);
}
else
{
Grib2Record gr = new Grib2Record(header, is_Renamed, id, gds, pds, drs, bms, GdsOffset, PdsOffset, lus);
records.Add(gr);
}
if (oneRecord)
return true;
// early return because ending "7777" missing
if (raf.Position > raf.Length)
{
raf.Seek(0, System.IO.SeekOrigin.Begin);
return true;
}
// EndSection processing section 8
int ending = GribNumbers.int4(raf);
//System.out.println( "ending = " + ending );
if (ending == 926365495)
{
// record ending string 7777 as a number
startAtHeader = true;
processGDS = true;
}
else
{
int section = raf.ReadByte(); // check if GDS or PDS section, 3 or 4
//System.out.println( "section = " + section );
//reset back to begining of section
raf.Seek(raf.Position - 5, System.IO.SeekOrigin.Begin);
if (section == 3)
{
// start processing at GDS
startAtHeader = false;
processGDS = true;
}
else if (section == 4)
{
// start processing at PDS
startAtHeader = false;
processGDS = false;
}
else
{
// error
Grib2EndSection es = new Grib2EndSection(raf);
if (es.EndFound)
{
// ending found somewhere in file
startAtHeader = true;
processGDS = true;
}
else
{
//System.err.println( "Grib2Input: possible file corruption");
throw new NoValidGribException("Grib2Input.scan failed to find end of record");
}
}
}
//System.out.println( "raf.getFilePointer=" + raf.getFilePointer() );
//System.out.println( "raf.length()=" + raf.length() );
} // end raf.getFilePointer() < raf.length()
//System.out.println("GribInput: processed in " +
// (System.currentTimeMillis()- start) + " milliseconds");
return true;
}
/// <summary> scans the Grib2 file obtaining Products or Records that contain all
/// needed information for data extraction later. For most purposes,
/// getProductsOnly should be set to true, it's lightweight of getRecords.
/// </summary>
/// <param name="getProductsOnly">
/// </param>
/// <param name="oneRecord">
/// </param>
/// <returns> success
/// </returns>
/// <throws> NotSupportedException </throws>
/// <throws> IOException </throws>
public bool scan(bool getProductsOnly, bool oneRecord)
{
if (raf == null)
{
throw new ApplicationException("Grib2Input.scan called without file");
}
long start = (System.DateTime.Now.Ticks - 621355968000000000) / 10000;
Grib2IndicatorSection is_Renamed = null;
Grib2IdentificationSection id = null;
Grib2LocalUseSection lus = null;
Grib2GridDefinitionSection gds = null;
// if raf.getFilePointer() != 0 then called from Grib2IndexExtender
if (raf.Position > 4)
{
raf.Seek(raf.Position - 4, System.IO.SeekOrigin.Begin);
Grib2EndSection es = new Grib2EndSection(raf);
if (!es.EndFound)
{
// ending found somewhere in file
throw new NoValidGribException("Grib2Input.scan failed to find end of record");
}
//System.out.println( "Scan succeeded to find end of record");
}
//System.out.println("Scan file pointer =" + raf.getFilePointer());
long GdsOffset = 0; // GDS offset from start of file
bool startAtHeader = true; // otherwise skip to GDS
bool processGDS = true;
while (raf.Position < raf.Length)
{
if (startAtHeader)
{
// begining of record
if (!seekHeader(raf, raf.Length))
{
//System.out.println( "Scan seekHeader failed" );
throw new NoValidGribException("Grib2Input.scan failed to find header");
}
// Read Section 0 Indicator Section
is_Renamed = new Grib2IndicatorSection(raf); // section 0
//System.out.println( "Grib record length=" + is.getGribLength());
if (is_Renamed.GribEdition != 2)
{
throw new NoValidGribException("Grib2Input.scan expected GRIB2 file");
}
// Read other Sections
id = new Grib2IdentificationSection(raf); // Section 1
} // end startAtHeader
if (processGDS)
{
// check for Local Use Section 2
lus = new Grib2LocalUseSection(raf);
// obtain GDS offset in the file for this record
GdsOffset = raf.Position;
// Section 3
gds = new Grib2GridDefinitionSection(raf, getProductsOnly);
//System.out.println( "GDS length=" + gds.getLength() );
} // end processGDS
// obtain PDS offset in the file for this record
long PdsOffset = raf.Position;
Grib2ProductDefinitionSection pds = new Grib2ProductDefinitionSection(raf); // Section 4
Grib2DataRepresentationSection drs = null;
Grib2BitMapSection bms = null;
Grib2DataSection ds = null;
drs = new Grib2DataRepresentationSection(raf); // Section 5
bms = new Grib2BitMapSection(raf, gds); // Section 6
//ds = new Grib2DataSection( getData, raf, gds, drs, bms ); //Section 7
ds = new Grib2DataSection(false, raf, gds, drs, bms); //Section 7
// assume scan ok
if (getProductsOnly)
{
Grib2Product gp = new Grib2Product(header, is_Renamed, id, getGDSkey(gds), pds, GdsOffset, PdsOffset);
products.Add(gp);
}
else
{
Grib2Record gr = new Grib2Record(header, is_Renamed, id, gds, pds, drs, bms, GdsOffset, PdsOffset, lus);
records.Add(gr);
}
if (oneRecord)
{
return(true);
}
// early return because ending "7777" missing
if (raf.Position > raf.Length)
{
raf.Seek(0, System.IO.SeekOrigin.Begin);
return(true);
}
// EndSection processing section 8
int ending = GribNumbers.int4(raf);
//System.out.println( "ending = " + ending );
if (ending == 926365495)
{
// record ending string 7777 as a number
startAtHeader = true;
processGDS = true;
}
else
{
int section = raf.ReadByte(); // check if GDS or PDS section, 3 or 4
//System.out.println( "section = " + section );
//reset back to begining of section
raf.Seek(raf.Position - 5, System.IO.SeekOrigin.Begin);
if (section == 3)
{
// start processing at GDS
startAtHeader = false;
processGDS = true;
}
else if (section == 4)
{
// start processing at PDS
startAtHeader = false;
processGDS = false;
}
else
{
// error
Grib2EndSection es = new Grib2EndSection(raf);
if (es.EndFound)
{
// ending found somewhere in file
startAtHeader = true;
processGDS = true;
}
else
{
//System.err.println( "Grib2Input: possible file corruption");
throw new NoValidGribException("Grib2Input.scan failed to find end of record");
}
}
}
//System.out.println( "raf.getFilePointer=" + raf.getFilePointer() );
//System.out.println( "raf.length()=" + raf.length() );
} // end raf.getFilePointer() < raf.length()
//System.out.println("GribInput: processed in " +
// (System.currentTimeMillis()- start) + " milliseconds");
return(true);
} // end scan