/// <summary>
/// Reads the header of a Shapefile
/// </summary>
/// <param name="reader">The Shapefile stream</param>
/// <returns>The shapefile header</returns>
private void ReadFileHeader(BinaryReader reader, out ShapefileShapeType shapeType, out BoundingBox bounds)
{
// Read File Code.
int FileCode = NumberReader.ReadIntBE(reader);
//Verify that the file has the correct file code (9994)
if (FileCode != 9994)
{
throw new FormatException("Invalid FileCode encountered. Expecting a file code of 9994.");
}
//Skip unused section
reader.BaseStream.Seek(20, SeekOrigin.Current);
// Read the File Length.
long fileLength = NumberReader.ReadIntBE(reader);
// Skip the Version number of the shapefile.
reader.BaseStream.Seek(4, SeekOrigin.Current);
// Get the shape type of the shapefile. Note that shapefiles can only contain one type of shape per file
shapeType = (ShapefileShapeType)NumberReader.ReadIntLE(reader);
// Get the bounding box of the Bounding Box.
bounds = ReadBoundingBox(reader);
}
/// <summary>
/// Read the header of a record
/// </summary>
/// <param name="reader">The Shapefile stream</param>
/// <returns>The number of records in the file</returns>
private int ReadRecordHeader(BinaryReader reader)
{
int recordNumber = NumberReader.ReadIntBE(reader);
//Skip content length and shape type properties of shape record
reader.BaseStream.Seek(8, SeekOrigin.Current);
return(recordNumber);
}
