/// <summary>
/// Read a whole track and cache it
/// </summary>
/// <param name="stream">The stream to read from</param>
/// <param name="cyl">The cylinder number of the track being read.</param>
/// <param name="head">The head number of the track being read.</param>
void ReadTrack(Stream stream, int cyl, int head)
{
byte[] sectorData;
byte[] crc;
short calculatedCRC;
for (int sect = 1; sect < imageInfo.SectorsPerTrack + 1; sect++)
{
/* read the sector header */
byte[] sheaderBuffer = new byte[6];
stream.Read(sheaderBuffer, 0, 6);
IntPtr sectPtr = Marshal.AllocHGlobal(6);
Marshal.Copy(sheaderBuffer, 0, sectPtr, 6);
WCDiskImageSectorHeader sheader = (WCDiskImageSectorHeader)Marshal.PtrToStructure(sectPtr, typeof(WCDiskImageSectorHeader));
Marshal.FreeHGlobal(sectPtr);
/* validate the sector header */
if ((sheader.cylinder != cyl) || (sheader.head != head) || (sheader.sector != sect))
{
throw new InvalidDataException(String.Format("Unexpected sector encountered. Found CHS {0},{1},{2} but expected {3},{4},{5}",
sheader.cylinder, sheader.head, sheader.sector, cyl, head, sect));
}
sectorData = new byte[512];
/* read the sector data */
switch (sheader.flag)
{
case SectorFlag.Normal: /* read a normal sector and store it in cache */
stream.Read(sectorData, 0, 512);
sectorCache[(cyl, head, sect)] = sectorData;
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);
DicConsole.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)
{
DicConsole.DebugWriteLine("d2f plugin", "Extra track 1 (head 0) present, reading");
ReadTrack(stream, (int)imageInfo.Cylinders, 0);
}
if (fheader.extraTracks[1] == 1)
{
DicConsole.DebugWriteLine("d2f plugin", "Extra track 1 (head 1) present, reading");
ReadTrack(stream, (int)imageInfo.Cylinders, 1);
}
if (fheader.extraTracks[2] == 1)
{
DicConsole.DebugWriteLine("d2f plugin", "Extra track 2 (head 0) present, reading");
ReadTrack(stream, (int)imageInfo.Cylinders + 1, 0);
}
if (fheader.extraTracks[3] == 1)
{
DicConsole.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))
{
DicConsole.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(string.Format("Invalid sector type '{0}' encountered",
sheader.flag.ToString()));
}
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))
{
DicConsole.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(string.Format("Invalid sector type '{0}' encountered",
sheader.flag.ToString()));
}
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);
}
