public FamicomDiskSystem_Side(Stream Image, uint Offset)
{
this.Image = Image;
this.StartOffset = Offset;
// Step 1: confirm the data contains valid FDS file system data
this.Image.Position = this.StartOffset;
// read first byte, confirm it is 0x01
// read the next 14 bytes, confirm it is ASCII for "*NINTENDO-HVC*"
byte[] verify = new byte[15];
this.Image.Read(verify, 0, 15);
if (verify[0] != 1 || Encoding.ASCII.GetString(verify, 1, 14) != "*NINTENDO-HVC*") throw new InvalidDataException("Not a valid Famicom Disk System file system (invalid hardware identifier in header)");
//next byte should be the manufacturer code
this.ManufacturerCode = (byte)Image.ReadByte();
verify = new byte[3];
this.Image.Read(verify, 0, 3);
this.GameName = Encoding.ASCII.GetString(verify);
this.GameType = (byte)this.Image.ReadByte();
this.GameVersion = (byte)this.Image.ReadByte();
this.SideNumber = (byte)this.Image.ReadByte();
this.DiskNumber = (byte)this.Image.ReadByte();
// Step 2: set up files
// check number of files
this.Image.Position = this.StartOffset + 0x38;
if (this.Image.ReadByte() != 2) throw new InvalidDataException("Not a valid Famicom Disk System file system (invalid file count block)");
int numfiles = this.Image.ReadByte();
if (numfiles == 0) Console.WriteLine("File count value is zero; may be invalid data or 'copy protection'");
this.Root = new Directory();
this.Root.Contents = new FamicomDiskSystem_File[numfiles];
byte[] filename = new byte[8];
byte[] size = new byte[2];
for (int allfiles = 0; allfiles < numfiles; allfiles++)
{
// assume the stream pointer is set properly...
if (this.Image.ReadByte() != 3) if (this.Image.ReadByte() != 2) throw new InvalidDataException("Not a valid Famicom Disk System file system (invalid beginning of file metadata byte while trying file #" + allfiles + ")");
var props = new FamicomDiskSystem_File.Properties();
props.Number = (byte)this.Image.ReadByte();
props.ID = (byte)this.Image.ReadByte();
this.Image.Read(filename, 0, 8);
props.Name = String.Format("{0}:{1}", props.ID.ToString(), Encoding.ASCII.GetString(filename));
string test = Text.Transcode.UsingSJIS(filename);
//ignore the destination address for now..
this.Image.ReadByte();
this.Image.ReadByte();
this.Image.Read(size, 0, 2);
if (!BitConverter.IsLittleEndian) Array.Reverse(size);
props.Length = (ushort)BitConverter.ToInt16(size, 0);
props.Type = (FamicomDiskSystem_File.FileTypes)this.Image.ReadByte();
if (this.Image.ReadByte() != 4) throw new InvalidDataException("Not a valid Famicom Disk System file system (invalid beginning of file data byte while trying file #" + allfiles + ")");
props.Offset = (ulong)this.Image.Position;
//this.objects.Add(props.Name, new FamicomDiskSystem_File(props));
this.Root.Contents[allfiles] = new FamicomDiskSystem_File(props);
this.Image.Seek(props.Length, SeekOrigin.Current);
}
}
