public void GetLittleEndianUInt32()
{
_log.Debug("Running: GetLittleEndianUInt32");
const UInt32 anInt = 12345;
UInt32 aNewInt = ByteEncoder.GetLittleEndian(anInt);
Assert.IsTrue(anInt == ByteEncoder.GetLittleEndian(aNewInt));
}
public void GetLittleEndianlong()
{
_log.Debug("Running: GetLittleEndianlong");
const long anInt = 123456660700770;
long aNewInt = ByteEncoder.GetLittleEndian(anInt);
Assert.IsTrue(anInt == ByteEncoder.GetLittleEndian(aNewInt));
}
public void WriteHeader(BinaryWriter writer)
{
writer.Seek(0, SeekOrigin.Begin);
writer.Write(ByteEncoder.GetBigEndian(ShapeFileConstants.HeaderStartCode));
writer.Write(new Byte[20]);
writer.Write(ByteEncoder.GetBigEndian(FileLengthInWords));
writer.Write(ByteEncoder.GetLittleEndian(ShapeFileConstants.VersionCode));
writer.Write(ByteEncoder.GetLittleEndian((Int32)ShapeType));
writer.Write(ByteEncoder.GetLittleEndian(Extents.GetMin(Ordinates.X)));
writer.Write(ByteEncoder.GetLittleEndian(Extents.GetMin(Ordinates.Y)));
writer.Write(ByteEncoder.GetLittleEndian(Extents.GetMax(Ordinates.X)));
writer.Write(ByteEncoder.GetLittleEndian(Extents.GetMax(Ordinates.Y)));
writer.Write(new Byte[32]); // Z-values and M-values
}
/// <summary>
/// Reads and parses the header of the .shp index file
/// </summary>
/// <remarks>
/// From ESRI ShapeFile Technical Description document
///
/// http://www.esri.com/library/whitepapers/pdfs/shapefile.pdf
///
/// Byte
/// Position Field Value Type Order
/// -----------------------------------------------------
/// Byte 0 File Code 9994 Integer Big
/// Byte 4 Unused 0 Integer Big
/// Byte 8 Unused 0 Integer Big
/// Byte 12 Unused 0 Integer Big
/// Byte 16 Unused 0 Integer Big
/// Byte 20 Unused 0 Integer Big
/// Byte 24 File Length File Length Integer Big
/// Byte 28 Version 1000 Integer Little
/// Byte 32 Shape Type Shape Type Integer Little
/// Byte 36 Bounding Box Xmin Double Little
/// Byte 44 Bounding Box Ymin Double Little
/// Byte 52 Bounding Box Xmax Double Little
/// Byte 60 Bounding Box Ymax Double Little
/// Byte 68* Bounding Box Zmin Double Little
/// Byte 76* Bounding Box Zmax Double Little
/// Byte 84* Bounding Box Mmin Double Little
/// Byte 92* Bounding Box Mmax Double Little
///
/// * Unused, with value 0.0, if not Measured or Z type
///
/// The "Integer" type corresponds to the CLS Int32 type, and "Double" to CLS Double (IEEE 754).
/// </remarks>
private void parseHeader(BinaryReader reader)
{
reader.BaseStream.Seek(0, SeekOrigin.Begin);
// Check file header
if (ByteEncoder.GetBigEndian(reader.ReadInt32()) != ShapeFileConstants.HeaderStartCode)
{
throw new ShapeFileIsInvalidException("Invalid ShapeFile (.shp)");
}
// Seek to File Length
reader.BaseStream.Seek(24, 0);
// Read filelength as big-endian. The length is number of 16-bit words in file
FileLengthInWords = ByteEncoder.GetBigEndian(reader.ReadInt32());
// Seek to ShapeType
reader.BaseStream.Seek(32, 0);
ShapeType = (ShapeType)reader.ReadInt32();
// Seek to bounding box of shapefile
reader.BaseStream.Seek(36, 0);
// Read the spatial bounding box of the contents
Double xMin = ByteEncoder.GetLittleEndian(reader.ReadDouble());
Double yMin = ByteEncoder.GetLittleEndian(reader.ReadDouble());
Double xMax = ByteEncoder.GetLittleEndian(reader.ReadDouble());
Double yMax = ByteEncoder.GetLittleEndian(reader.ReadDouble());
ICoordinate min = _geoFactory.CoordinateFactory.Create(xMin, yMin);
ICoordinate max = _geoFactory.CoordinateFactory.Create(xMax, yMax);
Extents = min.Equals(max) && min.Equals(_geoFactory.CoordinateFactory.Create(0, 0)) //jd: if the shapefile has just been created the box wil be 0,0,0,0 in this case create an empty extents
? _geoFactory.CreateExtents()
: _geoFactory.CreateExtents(min, max);
//jd:allow exmpty extents
//if (Extents.IsEmpty)
//{
// Extents = null;
//}
}