/// <summary>
/// Create a new JVC disk associated with the given stream.
/// </summary>
/// <param name="image">Stream for storing the disk image.</param>
/// <param name="heads">Number of disk heads.</param>
/// <param name="tracks">Number of tracks per head.</param>
/// <param name="sectors">Number of sectors per track.</param>
/// <param name="sectorsize">Sector size in bytes</param>
/// <returns>A disk object</returns>
public static JvcDisk Create(Stream image, int heads, int tracks, int sectors, int sectorsize)
{
if (image == null)
{
throw new ArgumentNullException("image");
}
if (!image.CanRead)
{
throw new NotSupportedException("Disk image stream does not support reading");
}
if (!image.CanSeek)
{
throw new NotSupportedException("Disk image stream does not support seeking");
}
if (!image.CanWrite)
{
throw new NotSupportedException("Disk image stream does not support writing");
}
var disk = new JvcDisk(image, heads, tracks, sectors, sectorsize);
var header = new JvcHeader(heads, tracks, sectors, sectorsize, false);
var headerRaw = header.Encode();
disk.diskHeaderSize = headerRaw.Length;
disk.sectorHeaderSize = 0;
disk.IsWriteable = true;
disk.IsModified = true;
disk.DiskData = new byte[heads * tracks * sectors * sectorsize + disk.diskHeaderSize];
Array.Copy(headerRaw, disk.DiskData, headerRaw.Length);
return(disk);
}
public static JvcHeader Parse(byte[] raw)
{
int headersize = raw.Length % 256;
int sectors = headersize >= 1 ? raw[0] : DefaultSectors;
int heads = headersize >= 2 ? raw[1] : DefaultHeads;
int sectorsize = headersize >= 3 ? (128 << raw[2]) : DefaultSectorSize;
bool sectorattribute = headersize >= 5 ? (raw[4] != 0) : DefaultSectorAttribute;
if (sectorattribute)
{
headersize = raw.Length % 257;
}
int tracks = (raw.Length - headersize) / heads / sectors / sectorsize;
var header = new JvcHeader(heads, tracks, sectors, sectorsize, sectorattribute);
header.HeaderSize = headersize;
return(header);
}
/// <summary>
/// Reads a JVC disk image from a given stream.
/// </summary>
/// <param name="image">Stream containing the disk image.</param>
/// <param name="isWriteable">Allow write operations to this disk.</param>
/// <returns>A disk object.</returns>
public static JvcDisk Open(Stream image, bool isWriteable)
{
if (image == null)
{
throw new ArgumentNullException("image");
}
if (!image.CanRead)
{
throw new NotSupportedException("Disk image stream does not support reading");
}
var imageData = IOUtils.ReadStreamFully(image);
var header = JvcHeader.Parse(imageData);
var disk = new JvcDisk(image, header.Heads, header.Tracks, header.Sectors, header.SectorSize);
disk.DiskData = imageData;
disk.diskHeaderSize = header.HeaderSize;
disk.sectorHeaderSize = header.SectorAttribute ? 1 : 0;
disk.IsWriteable = (isWriteable && image.CanSeek && image.CanWrite);
return(disk);
}
