protected override EpsgEllipsoid ReadValue(ushort key, BinaryReader reader)
{
var semiMajorAxis = _numberReader.GetValue(reader.ReadUInt16());
var valueB = _numberReader.GetValue(reader.ReadUInt16());
var name = TextReader.GetString(reader.ReadUInt16());
Contract.Assume(!String.IsNullOrEmpty(name));
var uom = EpsgMicroDatabase.Default.GetUnit(reader.ReadByte() + 9000);
Contract.Assume(uom != null);
return(new EpsgEllipsoid(
key, name, uom,
(valueB == semiMajorAxis)
? new Sphere(semiMajorAxis)
: (valueB < semiMajorAxis / 10.0)
? new SpheroidEquatorialInvF(semiMajorAxis, valueB) as ISpheroid <double>
: new SpheroidEquatorialPolar(semiMajorAxis, valueB)
));
}
protected override EpsgPrimeMeridian ReadValue(ushort key, BinaryReader reader)
{
var uom = EpsgMicroDatabase.Default.GetUnit(reader.ReadUInt16());
Contract.Assume(uom != null);
var longitude = _numberReader.GetValue(reader.ReadUInt16());
var name = TextReader.GetString(reader.ReadByte());
Contract.Assume(!String.IsNullOrEmpty(name));
return(new EpsgPrimeMeridian(key, name, longitude, uom));
}
protected override EpsgUnit ReadValue(ushort key, BinaryReader reader)
{
var name = TextReader.GetString(reader.ReadUInt16());
Contract.Assume(!String.IsNullOrEmpty(name));
var factorB = _numberReader.GetValue(reader.ReadUInt16());
var factorC = _numberReader.GetValue(reader.ReadUInt16());
// ReSharper disable CompareOfFloatsByEqualityOperator
if (factorC == 0)
{
if (factorB == 0)
{
factorC = Double.NaN;
}
else
{
throw new InvalidDataException("Bad unit conversion factor values.");
}
}
// ReSharper restore CompareOfFloatsByEqualityOperator
return(new EpsgUnit(key, name, TypeName, factorB, factorC, _generatingDatabase));
}
protected override EpsgCoordinateTransformInfo ReadValue(ushort key, BinaryReader reader)
{
var sourceCrsCode = reader.ReadUInt16();
var targetCrsCode = reader.ReadUInt16();
var opMethodCode = reader.ReadUInt16();
var accuracyValue = _numberReader.GetValue(reader.ReadUInt16());
var areaCode = reader.ReadUInt16();
var deprecated = reader.ReadByte() != 0;
var name = TextReader.GetString(reader.ReadUInt16());
var accuracy = accuracyValue == 999.0 ? (double?)null : accuracyValue;
Contract.Assume(!String.IsNullOrEmpty(name));
return(new EpsgCoordinateTransformInfo(
key, sourceCrsCode, targetCrsCode, opMethodCode,
accuracy, areaCode, deprecated, name));
}
private List <INamedParameter> ReadParametersForOperation(ushort key, EpsgParameterUsage[] usages, BinaryReader reader)
{
Contract.Requires(usages != null);
Contract.Requires(reader != null);
var parameters = new List <INamedParameter>(usages.Length);
foreach (var usage in usages)
{
var valueCode = reader.ReadUInt16();
var uomCode = reader.ReadUInt16();
EpsgUnit unit;
if (uomCode == UInt16.MaxValue)
{
unit = null;
}
else
{
unit = EpsgMicroDatabase.Default.GetUnit(uomCode);
Contract.Assume(unit != null);
}
var parameterName = usage.ParameterInfo.Name;
if (valueCode != 0xffff)
{
INamedParameter parameter;
if ((valueCode & 0xc000) == 0x8000)
{
var textValue = _textReader.GetString((ushort)(valueCode & 0x7fff));
parameter = new NamedParameter <string>(parameterName, textValue, unit);
}
else
{
parameter = new NamedParameter <double>(parameterName, _numberReader.GetValue(valueCode), unit);
}
parameters.Add(parameter);
}
}
return(parameters);
}
