public bool Identify(IFilter imageFilter) { Stream stream = imageFilter.GetDataForkStream(); stream.Seek(0, SeekOrigin.Begin); if (stream.Length < 32) { return(false); } byte[] header = new byte[32]; stream.Read(header, 0, 32); WcDiskImageFileHeader fheader = Marshal.ByteArrayToStructureLittleEndian <WcDiskImageFileHeader>(header); /* check the signature */ if (Encoding.ASCII.GetString(fheader.signature).TrimEnd('\x00') != _fileSignature) { return(false); } /* Some sanity checks on the values we just read. */ if (fheader.version > 1) { return(false); } if (fheader.heads < 1 || fheader.heads > 2) { return(false); } if (fheader.sectorsPerTrack < 8 || fheader.sectorsPerTrack > 18) { return(false); } if (fheader.cylinders < 1 || fheader.cylinders > 80) { return(false); } if (fheader.extraTracks[0] > 1 || fheader.extraTracks[1] > 1 || fheader.extraTracks[2] > 1 || fheader.extraTracks[3] > 1) { return(false); } // TODO: validate all sectors // For now, having a valid header will suffice. return(((byte)fheader.extraFlags & ~0x03) == 0); }
public bool Open(IFilter imageFilter) { string comments = string.Empty; Stream stream = imageFilter.GetDataForkStream(); stream.Seek(0, SeekOrigin.Begin); byte[] header = new byte[32]; stream.Read(header, 0, 32); WcDiskImageFileHeader fheader = Marshal.ByteArrayToStructureLittleEndian <WcDiskImageFileHeader>(header); AaruConsole.DebugWriteLine("d2f plugin", "Detected WC DISK IMAGE with {0} heads, {1} tracks and {2} sectors per track.", fheader.heads, fheader.cylinders, fheader.sectorsPerTrack); _imageInfo.Cylinders = fheader.cylinders; _imageInfo.SectorsPerTrack = fheader.sectorsPerTrack; _imageInfo.SectorSize = 512; // only 512 bytes per sector supported _imageInfo.Heads = fheader.heads; _imageInfo.Sectors = _imageInfo.Heads * _imageInfo.Cylinders * _imageInfo.SectorsPerTrack; _imageInfo.ImageSize = _imageInfo.Sectors * _imageInfo.SectorSize; _imageInfo.XmlMediaType = XmlMediaType.BlockMedia; _imageInfo.CreationTime = imageFilter.GetCreationTime(); _imageInfo.LastModificationTime = imageFilter.GetLastWriteTime(); _imageInfo.MediaTitle = Path.GetFileNameWithoutExtension(imageFilter.GetFilename()); _imageInfo.MediaType = Geometry.GetMediaType(((ushort)_imageInfo.Cylinders, (byte)_imageInfo.Heads, (ushort)_imageInfo.SectorsPerTrack, 512, MediaEncoding.MFM, false)); /* buffer the entire disk in memory */ for (int cyl = 0; cyl < _imageInfo.Cylinders; cyl++) { for (int head = 0; head < _imageInfo.Heads; head++) { ReadTrack(stream, cyl, head); } } /* if there are extra tracks, read them as well */ if (fheader.extraTracks[0] == 1) { AaruConsole.DebugWriteLine("d2f plugin", "Extra track 1 (head 0) present, reading"); ReadTrack(stream, (int)_imageInfo.Cylinders, 0); } if (fheader.extraTracks[1] == 1) { AaruConsole.DebugWriteLine("d2f plugin", "Extra track 1 (head 1) present, reading"); ReadTrack(stream, (int)_imageInfo.Cylinders, 1); } if (fheader.extraTracks[2] == 1) { AaruConsole.DebugWriteLine("d2f plugin", "Extra track 2 (head 0) present, reading"); ReadTrack(stream, (int)_imageInfo.Cylinders + 1, 0); } if (fheader.extraTracks[3] == 1) { AaruConsole.DebugWriteLine("d2f plugin", "Extra track 2 (head 1) present, reading"); ReadTrack(stream, (int)_imageInfo.Cylinders + 1, 1); } /* adjust number of cylinders */ if (fheader.extraTracks[0] == 1 || fheader.extraTracks[1] == 1) { _imageInfo.Cylinders++; } if (fheader.extraTracks[2] == 1 || fheader.extraTracks[3] == 1) { _imageInfo.Cylinders++; } /* read the comment and directory data if present */ if (fheader.extraFlags.HasFlag(ExtraFlag.Comment)) { AaruConsole.DebugWriteLine("d2f plugin", "Comment present, reading"); byte[] sheaderBuffer = new byte[6]; stream.Read(sheaderBuffer, 0, 6); WcDiskImageSectorHeader sheader = Marshal.ByteArrayToStructureLittleEndian <WcDiskImageSectorHeader>(sheaderBuffer); if (sheader.flag != SectorFlag.Comment) { throw new InvalidDataException($"Invalid sector type '{sheader.flag.ToString()}' encountered"); } byte[] comm = new byte[sheader.crc]; stream.Read(comm, 0, sheader.crc); comments += Encoding.ASCII.GetString(comm) + Environment.NewLine; } if (fheader.extraFlags.HasFlag(ExtraFlag.Directory)) { AaruConsole.DebugWriteLine("d2f plugin", "Directory listing present, reading"); byte[] sheaderBuffer = new byte[6]; stream.Read(sheaderBuffer, 0, 6); WcDiskImageSectorHeader sheader = Marshal.ByteArrayToStructureLittleEndian <WcDiskImageSectorHeader>(sheaderBuffer); if (sheader.flag != SectorFlag.Directory) { throw new InvalidDataException($"Invalid sector type '{sheader.flag.ToString()}' encountered"); } byte[] dir = new byte[sheader.crc]; stream.Read(dir, 0, sheader.crc); comments += Encoding.ASCII.GetString(dir); } if (comments.Length > 0) { _imageInfo.Comments = comments; } // save some variables for later use _fileHeader = fheader; _wcImageFilter = imageFilter; return(true); }