protected ShapefileWriter(string path, ShapefileHeader header, FileMode fileMode, FileAccess fileAccess)
{
_writerShape = new BinaryWriter(new FileStream(path, fileMode, fileAccess));
_writerIndex = new BinaryWriter(new FileStream(Path.ChangeExtension(path, ".shx"), fileMode, fileAccess));
_header = header;
}
public static ShapefileHeader Read(BinaryReader reader)
{
ShapefileHeader header = new ShapefileHeader();
int fileType = reader.ReadInt32BE();
if (fileType != 9994)
throw new Exception("The first four bytes of this file indicate this is not a shape file.");
// skip 5 unsed bytes
reader.BaseStream.Seek(20L, SeekOrigin.Current);
header.FileLength = reader.ReadInt32BE();
int version = reader.ReadInt32();
if (version != 1000)
throw new Exception("Shapefile is not the proper version");
header.ShapeType = (ShapefileGeometryType)reader.ReadInt32();
double[] coords = new double[4];
for (int i = 0; i < 4; i++)
coords[i] = reader.ReadDouble();
header.Bounds = new Envelope(coords[0], coords[2], coords[1], coords[3]);
// Skip to end of header
reader.BaseStream.Seek(100L, SeekOrigin.Begin);
return header;
}
public static ShapefileWriter Create(string path, ShapefileHeader header)
{
ShapefileWriter writer = new ShapefileWriter(path, header, FileMode.CreateNew, FileAccess.Write);
writer._writerShape.BaseStream.Seek(100L, SeekOrigin.Begin);
writer._writerIndex.BaseStream.Seek(100L, SeekOrigin.Begin);
writer._recordNumber = 1;
writer._filePos = 50;
return writer;
}
public static ShapefileDataWriter Create(string path, DbfHeader dbfHeader, ShapefileHeader shapeHeader)
{
ShapefileDataWriter writer = new ShapefileDataWriter(path, shapeHeader, FileMode.CreateNew, FileAccess.Write);
writer._writerShape.BaseStream.Seek(100L, SeekOrigin.Begin);
writer._writerIndex.BaseStream.Seek(100L, SeekOrigin.Begin);
writer._dbf = DbfFile.Create(Path.ChangeExtension(path, ".dbf"), dbfHeader);
writer._currentRecord = new DbfRecord(dbfHeader);
writer._recordNumber = 1;
writer._filePos = 50;
return writer;
}
public static ShapefileHeader Read(BinaryReader reader)
{
ShapefileHeader header = new ShapefileHeader();
int fileType = reader.ReadInt32BE();
if (fileType != 9994)
{
throw new Exception("The first four bytes of this file indicate this is not a shape file.");
}
// skip 5 unsed bytes
reader.BaseStream.Seek(20L, SeekOrigin.Current);
header.FileLength = reader.ReadInt32BE();
int version = reader.ReadInt32();
if (version != 1000)
{
throw new Exception("Shapefile is not the proper version");
}
header.ShapeType = (ShapefileGeometryType)reader.ReadInt32();
double[] coords = new double[4];
for (int i = 0; i < 4; i++)
{
coords[i] = reader.ReadDouble();
}
header.Bounds = new Envelope(coords[0], coords[2], coords[1], coords[3]);
// Skip to end of header
reader.BaseStream.Seek(100L, SeekOrigin.Begin);
return(header);
}
protected ShapefileDataWriter(string path, ShapefileHeader shapeHeader, FileMode fileMode, FileAccess fileAccess)
: base(path, shapeHeader, fileMode, fileAccess)
{
}
private void Write(ShapefileHeader header, BinaryWriter stream, int fileLength)
{
stream.BaseStream.Seek(0, SeekOrigin.Begin);
stream.WriteBE(9994);
stream.WriteBE(0);
stream.WriteBE(0);
stream.WriteBE(0);
stream.WriteBE(0);
stream.WriteBE(0);
stream.WriteBE(fileLength);
stream.Write(1000);
stream.Write((int)header.ShapeType);
stream.Write(header.Bounds.Minimum.X);
stream.Write(header.Bounds.Minimum.Y);
stream.Write(header.Bounds.Maximum.X);
stream.Write(header.Bounds.Maximum.Y);
}
protected ShapefileDataWriter(string path, ShapefileHeader shapeHeader, FileMode fileMode, FileAccess fileAccess)
: base(path, shapeHeader, fileMode, fileAccess)
{
}
