/// <summary>
/// Initializes a new instance of the ShapefileHeader class with values read in from the stream.
/// </summary>
/// <remarks>Reads the header information from the stream.</remarks>
/// <param name="shpBinaryReader">BigEndianBinaryReader stream to the shapefile.</param>
public ShapefileHeader(BigEndianBinaryReader shpBinaryReader)
{
if (shpBinaryReader == null)
throw new ArgumentNullException("shpBinaryReader");
_fileCode = shpBinaryReader.ReadInt32BE();
if (_fileCode != Shapefile.ShapefileId)
throw new ShapefileException("The first four bytes of this file indicate this is not a shape file.");
// skip 5 unsed bytes
shpBinaryReader.ReadInt32BE();
shpBinaryReader.ReadInt32BE();
shpBinaryReader.ReadInt32BE();
shpBinaryReader.ReadInt32BE();
shpBinaryReader.ReadInt32BE();
_fileLength = shpBinaryReader.ReadInt32BE();
_version = shpBinaryReader.ReadInt32();
Debug.Assert(_version == 1000, "Shapefile version", String.Format("Expecting only one version (1000), but got {0}",_version));
int shapeType = shpBinaryReader.ReadInt32();
_shapeType = (ShapeGeometryType) Enum.Parse(typeof(ShapeGeometryType), shapeType.ToString());
//read in and store the bounding box
double[] coords = new double[4];
for (int i = 0; i < 4; i++)
coords[i] = shpBinaryReader.ReadDouble();
_bounds = new Envelope(coords[0], coords[2], coords[1], coords[3]);
// skip z and m bounding boxes.
for (int i = 0; i < 4; i++)
shpBinaryReader.ReadDouble();
}
/// <summary>
/// Advances the enumerator to the next element of the collection.
/// </summary>
/// <returns>
/// true if the enumerator was successfully advanced to the next element;
/// false if the enumerator has passed the end of the collection.
/// </returns>
/// <exception cref="T:System.InvalidOperationException">The collection was modified after the enumerator was created. </exception>
public bool MoveNext()
{
if (_shpBinaryReader.PeekChar() != -1)
{
// Mark Jacquin: add a try catch when some shapefile have extra char at the end but no record
try
{
int recordNumber = _shpBinaryReader.ReadInt32BE();
int contentLength = _shpBinaryReader.ReadInt32BE();
_geometry = _handler.Read(_shpBinaryReader, _parent._geometryFactory);
}
catch (Exception) { return(false); }
return(true);
}
else
{
// Reached end of file, so close the reader.
//_shpBinaryReader.Close();
return(false);
}
}
/// <summary>
/// Initializes a new instance of the ShapefileHeader class with values read in from the stream.
/// </summary>
/// <remarks>Reads the header information from the stream.</remarks>
/// <param name="shpBinaryReader">BigEndianBinaryReader stream to the shapefile.</param>
public ShapefileHeader(BigEndianBinaryReader shpBinaryReader)
{
if (shpBinaryReader == null)
{
throw new ArgumentNullException("shpBinaryReader");
}
_fileCode = shpBinaryReader.ReadInt32BE();
if (_fileCode != Shapefile.ShapefileId)
{
throw new ShapefileException("The first four bytes of this file indicate this is not a shape file.");
}
// skip 5 unsed bytes
shpBinaryReader.ReadInt32BE();
shpBinaryReader.ReadInt32BE();
shpBinaryReader.ReadInt32BE();
shpBinaryReader.ReadInt32BE();
shpBinaryReader.ReadInt32BE();
_fileLength = shpBinaryReader.ReadInt32BE();
_version = shpBinaryReader.ReadInt32();
Debug.Assert(_version == 1000, "Shapefile version", String.Format("Expecting only one version (1000), but got {0}", _version));
int shapeType = shpBinaryReader.ReadInt32();
_shapeType = (ShapeGeometryTypes)Enum.Parse(typeof(ShapeGeometryTypes), shapeType.ToString());
//read in and store the bounding box
double[] coords = new double[4];
for (int i = 0; i < 4; i++)
{
coords[i] = shpBinaryReader.ReadDouble();
}
_bounds = new Envelope(coords[0], coords[2], coords[1], coords[3]);
// skip z and m bounding boxes.
for (int i = 0; i < 4; i++)
{
shpBinaryReader.ReadDouble();
}
}
/// <summary>
/// Reads a generic stream containing geographic data saved as shapefile structure,
/// and returns a collection of all the features contained.
/// Since NTS Geometry Model not support Z and M data, those informations are ignored if presents in shapefile.
/// </summary>
/// <param name="stream">Shapefile data stream.</param>
/// <returns><c>GeometryCollection</c> containing all geometries in shapefile.</returns>
protected IGeometryCollection Read(Stream stream)
{
// Read big endian values
using (BigEndianBinaryReader beReader = new BigEndianBinaryReader(stream))
{
// Verify File Code
int fileCode = beReader.ReadInt32BE();
Debug.Assert(fileCode == 9994);
stream.Seek(20, SeekOrigin.Current);
length = beReader.ReadInt32BE();
// Read little endian values
using (BinaryReader leReader = new BinaryReader(stream))
{
ArrayList list = null;
// Verify Version
int version = leReader.ReadInt32();
Debug.Assert(version == 1000);
// ShapeTypes
int shapeType = leReader.ReadInt32();
switch ((ShapeGeometryType) shapeType)
{
case ShapeGeometryType.Point:
case ShapeGeometryType.PointZ:
case ShapeGeometryType.PointM:
case ShapeGeometryType.PointZM:
list = new ArrayList(ReadPointData(stream));
break;
case ShapeGeometryType.LineString:
case ShapeGeometryType.LineStringZ:
case ShapeGeometryType.LineStringM:
case ShapeGeometryType.LineStringZM:
list = new ArrayList(ReadLineStringData(stream));
break;
case ShapeGeometryType.Polygon:
case ShapeGeometryType.PolygonZ:
case ShapeGeometryType.PolygonM:
case ShapeGeometryType.PolygonZM:
list = new ArrayList(ReadPolygonData(stream));
break;
case ShapeGeometryType.MultiPoint:
case ShapeGeometryType.MultiPointZ:
case ShapeGeometryType.MultiPointM:
case ShapeGeometryType.MultiPointZM:
list = new ArrayList(ReadMultiPointData(stream));
break;
case ShapeGeometryType.MultiPatch:
throw new NotImplementedException("FeatureType " + shapeType + " not supported.");
default:
throw new ArgumentOutOfRangeException("FeatureType " + shapeType + " not recognized by the system");
}
IGeometryCollection collection = shapeReader.CreateGeometryCollection(list);
return collection;
}
}
}
/// <summary>
///
/// </summary>
/// <param name="beReader"></param>
private void ReadFeatureHeader(BigEndianBinaryReader beReader)
{
int recordNumber = beReader.ReadInt32BE();
int contentLength = beReader.ReadInt32BE();
int shapeType = beReader.ReadInt32();
}
/// <summary>
/// Reads a generic stream containing geographic data saved as shapefile structure,
/// and returns a collection of all the features contained.
/// Since NTS Geometry Model not support Z and M data, those informations are ignored if presents in shapefile.
/// </summary>
/// <param name="stream">Shapefile data stream.</param>
/// <returns><c>GeometryCollection</c> containing all geometries in shapefile.</returns>
protected IGeometryCollection Read(Stream stream)
{
// Read big endian values
using (BigEndianBinaryReader beReader = new BigEndianBinaryReader(stream))
{
// Verify File Code
int fileCode = beReader.ReadInt32BE();
Debug.Assert(fileCode == 9994);
stream.Seek(20, SeekOrigin.Current);
length = beReader.ReadInt32BE();
// Read little endian values
using (BinaryReader leReader = new BinaryReader(stream))
{
ArrayList list = null;
// Verify Version
int version = leReader.ReadInt32();
Debug.Assert(version == 1000);
// ShapeTypes
int shapeType = leReader.ReadInt32();
switch ((ShapeGeometryTypes)shapeType)
{
case ShapeGeometryTypes.Point:
case ShapeGeometryTypes.PointZ:
case ShapeGeometryTypes.PointM:
case ShapeGeometryTypes.PointZM:
list = new ArrayList(ReadPointData(stream));
break;
case ShapeGeometryTypes.LineString:
case ShapeGeometryTypes.LineStringZ:
case ShapeGeometryTypes.LineStringM:
case ShapeGeometryTypes.LineStringZM:
list = new ArrayList(ReadLineStringData(stream));
break;
case ShapeGeometryTypes.Polygon:
case ShapeGeometryTypes.PolygonZ:
case ShapeGeometryTypes.PolygonM:
case ShapeGeometryTypes.PolygonZM:
list = new ArrayList(ReadPolygonData(stream));
break;
case ShapeGeometryTypes.MultiPoint:
case ShapeGeometryTypes.MultiPointZ:
case ShapeGeometryTypes.MultiPointM:
case ShapeGeometryTypes.MultiPointZM:
list = new ArrayList(ReadMultiPointData(stream));
break;
case ShapeGeometryTypes.MultiPatch:
throw new NotImplementedException("FeatureType " + shapeType + " not supported.");
default:
throw new ArgumentOutOfRangeException("FeatureType " + shapeType + " not recognized by the system");
}
IGeometryCollection collection = shapeReader.CreateGeometryCollection(list);
return(collection);
}
}
}
/// <summary>
///
/// </summary>
/// <param name="beReader"></param>
private void ReadFeatureHeader(BigEndianBinaryReader beReader)
{
int recordNumber = beReader.ReadInt32BE();
int contentLength = beReader.ReadInt32BE();
int shapeType = beReader.ReadInt32();
}
