/// <summary>
/// Parses data from the binnary array.
/// </summary>
/// <param name="wkb">The binary array with WKB serialized geometry.</param>
/// <returns>Parsed geometry.</returns>
/// <exception cref="WkbFormatException">Throws exception if wkb array does not contrains valid WKB geometry.</exception>
public static Geometry Parse(byte[] wkb)
{
if (wkb == null)
{
throw new ArgumentNullException("wkb");
}
using (MemoryStream ms = new MemoryStream(wkb)) {
using (BinaryReader reader = new BinaryReader(ms)) {
if (reader.PeekChar() == -1)
{
return(null);
}
try {
BinaryEncoding encoding = (BinaryEncoding)reader.ReadByte();
if (encoding == BinaryEncoding.BigEndian)
{
throw new NotSupportedException("Big endian encoding is not supprted in the current version of WkbReader.");
}
Geometry parsed = WkbReader.ReadGeometry(reader);
return(parsed);
}
catch (EndOfStreamException) {
throw new WkbFormatException("End of stream reached before end of valid WKB geometry end.");
}
}
}
}
/// <summary>
/// Reads GeometryCollection from the reader.
/// </summary>
/// <param name="reader">The reader used to read data from input stream.</param>
/// <param name="is3D">bool value indicating whether GeometryCollection beeing read has Z-dimension.</param>
/// <param name="isMeasured">bool value indicating whether GeometryCollection beeing read has M-value.</param>
/// <returns>GeometryCollection read from the input.</returns>
private static GeometryCollection <Geometry> ReadGeometryCollection(BinaryReader reader, bool is3D, bool isMeasured)
{
int pointsCount = (int)reader.ReadUInt32();
GeometryCollection <Geometry> result = new GeometryCollection <Geometry>();
for (int i = 0; i < pointsCount; i++)
{
result.Geometries.Add(WkbReader.ReadGeometry(reader));
}
return(result);
}
/// <summary>
/// Read geometry in WKB format from the input.
/// </summary>
/// <returns>Parsed geometry or null if no other geometry is available.</returns>
public Geometry Read()
{
if (_inputReader.PeekChar() == -1)
{
return(null);
}
try {
BinaryEncoding encoding = (BinaryEncoding)_inputReader.ReadByte();
if (encoding == BinaryEncoding.BigEndian)
{
throw new NotSupportedException("Big endian encoding is not supprted in the current version of WkbReader.");
}
return(WkbReader.ReadGeometry(_inputReader));
}
catch (EndOfStreamException) {
throw new WkbFormatException("End of stream reached before end of valid WKB geometry end.");
}
}