// *** constructors *******************************************************
/// <summary> Constructs a <tt>Grib2DataRepresentationSection</tt> object from a raf.
///
/// </summary>
/// <param name="raf">RandomAccessFile with Section DRS content
/// </param>
/// <throws> IOException if stream contains no valid GRIB file </throws>
//UPGRADE_TODO: Class 'java.io.RandomAccessFile' was converted to 'System.IO.FileStream' which has a different behavior. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1073_javaioRandomAccessFile'"
public Grib2DataRepresentationSection(System.IO.FileStream raf)
{
InitBlock();
// octets 1-4 (Length of DRS)
length = GribNumbers.int4(raf);
//System.out.println( "DRS length=" + length );
section = raf.ReadByte();
//System.out.println( "DRS is 5 section=" + section );
dataPoints = GribNumbers.int4(raf);
//System.out.println( "DRS dataPoints=" + dataPoints );
dataTemplate = (int)GribNumbers.uint2(raf);
//System.out.println( "DRS dataTemplate=" + dataTemplate );
switch (dataTemplate)
{
// Data Template Number
case 0:
case 1: // 0 - Grid point data - simple packing
// 1 - Matrix values - simple packing
//System.out.println( "DRS dataTemplate=" + dataTemplate );
referenceValue = GribNumbers.IEEEfloat4(raf);
binaryScaleFactor = GribNumbers.int2(raf);
decimalScaleFactor = GribNumbers.int2(raf);
numberOfBits = raf.ReadByte();
//System.out.println( "DRS numberOfBits=" + numberOfBits );
originalType = raf.ReadByte();
//System.out.println( "DRS originalType=" + originalType );
if (dataTemplate == 0)
{
break;
}
// case 1 not implememted
System.Console.Out.WriteLine("DRS dataTemplate=1 not implemented yet");
break;
case 2:
case 3: // Grid point data - complex packing
//System.out.println( "DRS dataTemplate=" + dataTemplate );
// octet 12 - 15
referenceValue = GribNumbers.IEEEfloat4(raf);
// octet 16 - 17
binaryScaleFactor = GribNumbers.int2(raf);
// octet 18 - 19
decimalScaleFactor = GribNumbers.int2(raf);
// octet 20
numberOfBits = raf.ReadByte();
//System.out.println( "DRS numberOfBits=" + numberOfBits );
// octet 21
originalType = raf.ReadByte();
//System.out.println( "DRS originalType=" + originalType );
// octet 22
splittingMethod = raf.ReadByte();
//System.out.println( "DRS splittingMethod=" +
// splittingMethod );
// octet 23
missingValueManagement = raf.ReadByte();
//System.out.println( "DRS missingValueManagement=" +
// missingValueManagement );
// octet 24 - 27
primaryMissingValue = GribNumbers.IEEEfloat4(raf);
// octet 28 - 31
secondaryMissingValue = GribNumbers.IEEEfloat4(raf);
// octet 32 - 35
numberOfGroups = GribNumbers.int4(raf);
//System.out.println( "DRS numberOfGroups=" +
// numberOfGroups );
// octet 36
referenceGroupWidths = raf.ReadByte();
//System.out.println( "DRS referenceGroupWidths=" +
// referenceGroupWidths );
// octet 37
bitsGroupWidths = raf.ReadByte();
// according to documentation subtract referenceGroupWidths
bitsGroupWidths = bitsGroupWidths - referenceGroupWidths;
//System.out.println( "DRS bitsGroupWidths=" +
// bitsGroupWidths );
// octet 38 - 41
referenceGroupLength = GribNumbers.int4(raf);
//System.out.println( "DRS referenceGroupLength=" +
// referenceGroupLength );
// octet 42
lengthIncrement = raf.ReadByte();
//System.out.println( "DRS lengthIncrement=" +
// lengthIncrement );
// octet 43 - 46
lengthLastGroup = GribNumbers.int4(raf);
//System.out.println( "DRS lengthLastGroup=" +
// lengthLastGroup );
// octet 47
bitsScaledGroupLength = raf.ReadByte();
//System.out.println( "DRS bitsScaledGroupLength=" +
// bitsScaledGroupLength );
if (dataTemplate == 2)
{
break;
}
// case 3 // complex packing & spatial differencing
orderSpatial = raf.ReadByte();
//System.out.println( "DRS orderSpatial=" + orderSpatial);
descriptorSpatial = raf.ReadByte();
//System.out.println( "DRS descriptorSpatial=" + descriptorSpatial);
break;
case 40:
case 40000: // Grid point data - JPEG 2000 Code Stream Format
//System.out.println( "DRS dataTemplate=" + dataTemplate );
referenceValue = GribNumbers.IEEEfloat4(raf);
binaryScaleFactor = GribNumbers.int2(raf);
decimalScaleFactor = GribNumbers.int2(raf);
numberOfBits = raf.ReadByte();
//System.out.println( "DRS numberOfBits=" + numberOfBits );
originalType = raf.ReadByte();
//System.out.println( "DRS originalType=" + originalType );
compressionMethod = raf.ReadByte();
//System.out.println( "DRS compressionMethod=" + compressionMethod );
compressionRatio = raf.ReadByte();
//System.out.println( "DRS compressionRatio=" + compressionRatio );
break;
default:
break;
}
} // end of Grib2DataRepresentationSection
