public Ssfs(Disk disk)
{
this.Disk = disk;
}
private void addFileToDisk(Disk disk, string filename, ushort[] contents)
{
if (contents.Length > 0xffff)
throw new SsfsException("file too long");
// How many sectors do we need?
var numsecs = (contents.Length + disk.SectorSize - 1) / disk.SectorSize;
var startsec = 0;
if (numsecs > 0)
{
// Find that many free sectors.
var secs = new ushort[numsecs];
{
var cur = disk.Words[5];
var sec = 0;
while (cur != 0 && sec < numsecs)
{
secs[sec++] = cur;
cur = disk.Sector[cur].Get(0);
}
if (sec != numsecs)
throw new SsfsException("not enough free sectors");
}
startsec = secs[0];
// Write data to sectors.
{
var coff = 0;
for (var s = 0; s < numsecs; ++s)
{
var sec = disk.Sector[secs[s]];
var stop = Math.Min(coff + 511, contents.Length);
for (var i = 1; coff < stop; ++i, ++coff)
sec.Set(i, contents[coff]);
}
}
// Unlink last sector, fix first free sector.
disk.Words[5] = disk.Sector[secs[numsecs - 1]].Get(0);
disk.Sector[secs[numsecs - 1]].Set(0, 0);
}
// Find a free directory entry.
var dirent = -1;
var dirstart = disk.Words[6] * disk.SectorSize;
for (int i = 0; i < MaxDirEnts; ++i)
{
if (disk.Words[dirstart + 8 * i] == 0)
{
dirent = i;
break;
}
}
if (dirent < 0)
throw new SsfsException("no free directory entries");
// Write directory entry
var direntoff = dirstart + dirent * 8;
for (var i = 0; i < 6; ++i)
disk.Words[direntoff + i] = 0;
{
var name = System.IO.Path.GetFileNameWithoutExtension(filename).ToUpper();
var ext = System.IO.Path.GetExtension(filename).ToUpper();
// Remove leading dot.
if (ext.Length > 0) ext = ext.Substring(1);
if (name.Length > 8)
throw new SsfsException("file name too long");
if (ext.Length > 4)
throw new SsfsException("file extension too long");
name.PackInto(disk.Words, direntoff);
ext.PackInto(disk.Words, direntoff + 4);
disk.Words[direntoff + 6] = (ushort)startsec;
disk.Words[direntoff + 7] = (ushort)contents.Length;
}
}
private IEnumerable<FileEntry> iterDiskFiles(Disk disk)
{
var dirstart = disk.Words[6] * disk.SectorSize;
var stop = dirstart + 512 * 8;
for (var i = dirstart; i < stop; i += 8)
{
if (disk.Words[i] == 0)
break;
else if (disk.Words[i] == 0xffff)
continue;
var name = disk.Words.UnpackString(i, 4);
var ext = disk.Words.UnpackString(i+4, 2);
var path = name + (ext.Length > 0 ? "." + ext : "");
yield return new FileEntry()
{
Path = path,
StartSector = disk.Words[i+6],
Length = disk.Words[i+7],
};
}
}
private List<FileEntry> listDiskFiles(Disk disk)
{
var l = new List<FileEntry>();
foreach (var entry in iterDiskFiles(disk))
{
l.Add(entry);
}
return l;
}
internal DiskSectors(Disk disk, int sectorWords)
: this()
{
this.SectorSize = sectorWords;
this.Disk = disk;
}
private void formatDisk(Disk disk, ushort[] bootloader)
{
// How many sectors will the bootloader require?
var bootsecs = 0;
if (bootloader != null)
bootsecs = (32 + bootloader.Length + disk.SectorSize - 1)
/ disk.SectorSize;
// Where will the directory listing go?
var dirsec = bootsecs + 1;
// Zero out the directory sectors.
for (var i = 0; i < 8; ++i)
disk.Sector[dirsec + i].Fill(0);
// Link unused sectors together.
var secs = disk.Sectors;
for (var i = dirsec + 8; i < secs; ++i)
{
disk.Sector[i].Fill(0);
if (i < secs - 1)
disk.Sector[i].Set(0, (ushort)(i + 1));
}
// Write header
var header = disk.Sector[0];
header.Set(0, 0);
header.Set(1, 0);
"SSFS".PackInto(header, 2);
header.Set(4, 0x0100);
header.Set(5, (ushort)(dirsec + 8));
header.Set(6, (ushort)dirsec);
// Write bootloader.
if (bootloader != null)
{
header.Set(0, BootJump0);
header.Set(1, BootJump1);
bootloader.CopyTo(disk.Words, 32);
}
// Done!
}
public void WriteTo(Stream s, bool raw = false)
{
Disk.WriteTo(s, raw);
}
public void WriteTo(string path, bool raw = false)
{
Disk.WriteTo(path, raw);
}
public Ssfs(Disk disk)
{
this.Disk = disk;
}
private void addFileToDisk(Disk disk, string filename, ushort[] contents)
{
if (contents.Length > 0xffff)
{
throw new SsfsException("file too long");
}
// How many sectors do we need?
var numsecs = (contents.Length + disk.SectorSize - 1) / disk.SectorSize;
var startsec = 0;
if (numsecs > 0)
{
// Find that many free sectors.
var secs = new ushort[numsecs];
{
var cur = disk.Words[5];
var sec = 0;
while (cur != 0 && sec < numsecs)
{
secs[sec++] = cur;
cur = disk.Sector[cur].Get(0);
}
if (sec != numsecs)
{
throw new SsfsException("not enough free sectors");
}
}
startsec = secs[0];
// Write data to sectors.
{
var coff = 0;
for (var s = 0; s < numsecs; ++s)
{
var sec = disk.Sector[secs[s]];
var stop = Math.Min(coff + 511, contents.Length);
for (var i = 1; coff < stop; ++i, ++coff)
{
sec.Set(i, contents[coff]);
}
}
}
// Unlink last sector, fix first free sector.
disk.Words[5] = disk.Sector[secs[numsecs - 1]].Get(0);
disk.Sector[secs[numsecs - 1]].Set(0, 0);
}
// Find a free directory entry.
var dirent = -1;
var dirstart = disk.Words[6] * disk.SectorSize;
for (int i = 0; i < MaxDirEnts; ++i)
{
if (disk.Words[dirstart + 8 * i] == 0)
{
dirent = i;
break;
}
}
if (dirent < 0)
{
throw new SsfsException("no free directory entries");
}
// Write directory entry
var direntoff = dirstart + dirent * 8;
for (var i = 0; i < 6; ++i)
{
disk.Words[direntoff + i] = 0;
}
{
var name = System.IO.Path.GetFileNameWithoutExtension(filename).ToUpper();
var ext = System.IO.Path.GetExtension(filename).ToUpper();
// Remove leading dot.
if (ext.Length > 0)
{
ext = ext.Substring(1);
}
if (name.Length > 8)
{
throw new SsfsException("file name too long");
}
if (ext.Length > 4)
{
throw new SsfsException("file extension too long");
}
name.PackInto(disk.Words, direntoff);
ext.PackInto(disk.Words, direntoff + 4);
disk.Words[direntoff + 6] = (ushort)startsec;
disk.Words[direntoff + 7] = (ushort)contents.Length;
}
}
static void MainTest(string[] args)
{
{
var disk = new Disk();
"Hello, World!".PackInto(disk.Words, 0);
disk.WriteTo("hello.disk.txt");
disk.WriteTo("hello.disk.bin", raw: true);
}
int __break = 1;
{
var disk = new Disk("hello.disk.txt");
var msg = disk.Words.UnpackString(0);
Console.WriteLine("Message: \"{0}\"", msg);
}
{
var disk = new Disk();
disk.ReadFrom("hello.disk.bin", raw: true);
var msg = disk.Words.UnpackString(0);
Console.WriteLine("Message: \"{0}\"", msg);
}
{
var fs = new Ssfs();
fs.Format(BinaryImage.ReadImage("boot/bootload.bin"));
fs.AddFile("kernel.sys", BinaryImage.ReadImage("boot/kernel.sys"));
fs.AddFile("hmd2043.drv", BinaryImage.ReadImage("boot/hmd2043.drv"));
fs.AddFile("ssfs.drv", BinaryImage.ReadImage("boot/ssfs.drv"));
fs.AddFile("shell.sys", BinaryImage.ReadImage("boot/shell.sys"));
fs.AddFile("shell.ro", BinaryImage.ReadImage("boot/shell.ro"));
fs.WriteTo("boot.disk.txt");
fs.WriteTo("boot.disk.bin", raw: true);
}
{
var fs = new Ssfs("boot.disk.txt");
Console.WriteLine("List of files in boot.disk.txt:");
foreach (var file in fs.IterFiles())
Console.WriteLine(" {0}", file.Path);
}
}
