/// <summary>
/// Perform segment-specific processing on the raw data. At this point the four byte type has already been read
/// in, so the position is at the four byte length int.
/// </summary>
/// <param name="file">The city file that is being read in.</param>
internal virtual void ParseSegment(FileStream file)
{
Length = file.Read4ByteInt();
RawDataFileOffset = (int)file.Position;
Data = new byte[Length];
file.Read(Data, 0, Length);
}
/// <summary>
/// Read in and validate the header of a city file.
/// </summary>
/// <param name="stream">File stream waiting at the header for instructions.</param>
/// <returns>The length (in bytes) of the data portion of this file.</returns>
private static int ParseHeader(FileStream reader)
{
// Case for too small of a file
if (reader.Length < 12)
throw new Exception("Unexpected file length.");
// Read 12-byte header.
string headChunk = reader.ReadString();
int dataLength = reader.Read4ByteInt();
string fileType = reader.ReadString();
// Make sure the header represents a valid city file.
if (!headChunk.Equals(HEADERCHUNK) || !fileType.Equals(FILETYPE))
throw new Exception("Invalid SC2000 file or corrupted header.");
return dataLength;
}