/// <summary>
/// Gets information about the mounted volume.
/// </summary>
/// <param name="stat">Information about the mounted volume.</param>
public Errno StatFs(out FileSystemInfo stat)
{
stat = null;
if (!mounted)
{
return(Errno.AccessDenied);
}
stat = cpmStat;
return(Errno.NoError);
}
public Errno Mount(IMediaImage imagePlugin, Partition partition, Encoding encoding,
Dictionary <string, string> options)
{
device = imagePlugin;
this.partition = partition;
Encoding = encoding ?? Encoding.GetEncoding("IBM437");
// As the identification is so complex, just call Identify() and relay on its findings
if (!Identify(device, partition) || !cpmFound || workingDefinition == null || dpb == null)
{
return(Errno.InvalidArgument);
}
// Build the software interleaving sector mask
if (workingDefinition.sides == 1)
{
sectorMask = new int[workingDefinition.side1.sectorIds.Length];
for (int m = 0; m < sectorMask.Length; m++)
{
sectorMask[m] = workingDefinition.side1.sectorIds[m] - workingDefinition.side1.sectorIds[0];
}
}
else
{
// Head changes after every track
if (string.Compare(workingDefinition.order, "SIDES", StringComparison.InvariantCultureIgnoreCase) == 0)
{
sectorMask = new int[workingDefinition.side1.sectorIds.Length +
workingDefinition.side2.sectorIds.Length];
for (int m = 0; m < workingDefinition.side1.sectorIds.Length; m++)
{
sectorMask[m] = workingDefinition.side1.sectorIds[m] - workingDefinition.side1.sectorIds[0];
}
// Skip first track (first side)
for (int m = 0; m < workingDefinition.side2.sectorIds.Length; m++)
{
sectorMask[m + workingDefinition.side1.sectorIds.Length] =
workingDefinition.side2.sectorIds[m] - workingDefinition.side2.sectorIds[0] +
workingDefinition.side1.sectorIds.Length;
}
}
// Head changes after whole side
else if (string.Compare(workingDefinition.order, "CYLINDERS",
StringComparison.InvariantCultureIgnoreCase) == 0)
{
for (int m = 0; m < workingDefinition.side1.sectorIds.Length; m++)
{
sectorMask[m] = workingDefinition.side1.sectorIds[m] - workingDefinition.side1.sectorIds[0];
}
// Skip first track (first side) and first track (second side)
for (int m = 0; m < workingDefinition.side1.sectorIds.Length; m++)
{
sectorMask[m + workingDefinition.side1.sectorIds.Length] =
workingDefinition.side1.sectorIds[m] - workingDefinition.side1.sectorIds[0] +
workingDefinition.side1.sectorIds.Length +
workingDefinition.side2.sectorIds.Length;
}
// TODO: Implement CYLINDERS ordering
DicConsole.DebugWriteLine("CP/M Plugin", "CYLINDERS ordering not yet implemented.");
return(Errno.NotImplemented);
}
// TODO: Implement COLUMBIA ordering
else if (string.Compare(workingDefinition.order, "COLUMBIA",
StringComparison.InvariantCultureIgnoreCase) == 0)
{
DicConsole.DebugWriteLine("CP/M Plugin",
"Don't know how to handle COLUMBIA ordering, not proceeding with this definition.");
return(Errno.NotImplemented);
}
// TODO: Implement EAGLE ordering
else if (string.Compare(workingDefinition.order, "EAGLE", StringComparison.InvariantCultureIgnoreCase) ==
0)
{
DicConsole.DebugWriteLine("CP/M Plugin",
"Don't know how to handle EAGLE ordering, not proceeding with this definition.");
return(Errno.NotImplemented);
}
else
{
DicConsole.DebugWriteLine("CP/M Plugin",
"Unknown order type \"{0}\", not proceeding with this definition.",
workingDefinition.order);
return(Errno.NotSupported);
}
}
// Deinterleave whole volume
Dictionary <ulong, byte[]> deinterleavedSectors = new Dictionary <ulong, byte[]>();
if (workingDefinition.sides == 1 ||
string.Compare(workingDefinition.order, "SIDES", StringComparison.InvariantCultureIgnoreCase) == 0)
{
DicConsole.DebugWriteLine("CP/M Plugin", "Deinterleaving whole volume.");
for (int p = 0; p <= (int)(partition.End - partition.Start); p++)
{
byte[] readSector =
device.ReadSector((ulong)((int)partition.Start + p / sectorMask.Length * sectorMask.Length +
sectorMask[p % sectorMask.Length]));
if (workingDefinition.complement)
{
for (int b = 0; b < readSector.Length; b++)
{
readSector[b] = (byte)(~readSector[b] & 0xFF);
}
}
deinterleavedSectors.Add((ulong)p, readSector);
}
}
int blockSize = 128 << dpb.bsh;
MemoryStream blockMs = new MemoryStream();
ulong blockNo = 0;
int sectorsPerBlock = 0;
Dictionary <ulong, byte[]> allocationBlocks = new Dictionary <ulong, byte[]>();
DicConsole.DebugWriteLine("CP/M Plugin", "Creating allocation blocks.");
// For each volume sector
for (ulong a = 0; a < (ulong)deinterleavedSectors.Count; a++)
{
deinterleavedSectors.TryGetValue(a, out byte[] sector);
// May it happen? Just in case, CP/M blocks are smaller than physical sectors
if (sector.Length > blockSize)
{
for (int i = 0; i < sector.Length / blockSize; i++)
{
byte[] tmp = new byte[blockSize];
Array.Copy(sector, blockSize * i, tmp, 0, blockSize);
allocationBlocks.Add(blockNo++, tmp);
}
}
// CP/M blocks are larger than physical sectors
else if (sector.Length < blockSize)
{
blockMs.Write(sector, 0, sector.Length);
sectorsPerBlock++;
if (sectorsPerBlock != blockSize / sector.Length)
{
continue;
}
allocationBlocks.Add(blockNo++, blockMs.ToArray());
sectorsPerBlock = 0;
blockMs = new MemoryStream();
}
// CP/M blocks are same size than physical sectors
else
{
allocationBlocks.Add(blockNo++, sector);
}
}
DicConsole.DebugWriteLine("CP/M Plugin", "Reading directory.");
int dirOff;
int dirSectors = (dpb.drm + 1) * 32 / workingDefinition.bytesPerSector;
if (workingDefinition.sofs > 0)
{
dirOff = workingDefinition.sofs;
}
else
{
dirOff = workingDefinition.ofs * workingDefinition.sectorsPerTrack;
}
// Read the whole directory blocks
MemoryStream dirMs = new MemoryStream();
for (int d = 0; d < dirSectors; d++)
{
deinterleavedSectors.TryGetValue((ulong)(d + dirOff), out byte[] sector);
dirMs.Write(sector, 0, sector.Length);
}
byte[] directory = dirMs.ToArray();
if (directory == null)
{
return(Errno.InvalidArgument);
}
int dirCnt = 0;
string file1 = null;
string file2 = null;
string file3 = null;
Dictionary <string, Dictionary <int, List <ushort> > > fileExtents =
new Dictionary <string, Dictionary <int, List <ushort> > >();
statCache = new Dictionary <string, FileEntryInfo>();
cpmStat = new FileSystemInfo();
bool atime = false;
dirList = new List <string>();
labelCreationDate = null;
labelUpdateDate = null;
passwordCache = new Dictionary <string, byte[]>();
DicConsole.DebugWriteLine("CP/M Plugin", "Traversing directory.");
IntPtr dirPtr;
// For each directory entry
for (int dOff = 0; dOff < directory.Length; dOff += 32)
{
// Describes a file (does not support PDOS entries with user >= 16, because they're identical to password entries
if ((directory[dOff] & 0x7F) < 0x10)
{
if (allocationBlocks.Count > 256)
{
dirPtr = Marshal.AllocHGlobal(32);
Marshal.Copy(directory, dOff, dirPtr, 32);
DirectoryEntry16 entry =
(DirectoryEntry16)Marshal.PtrToStructure(dirPtr, typeof(DirectoryEntry16));
Marshal.FreeHGlobal(dirPtr);
bool hidden = (entry.statusUser & 0x80) == 0x80;
bool rdOnly = (entry.filename[0] & 0x80) == 0x80 || (entry.extension[0] & 0x80) == 0x80;
bool system = (entry.filename[1] & 0x80) == 0x80 || (entry.extension[2] & 0x80) == 0x80;
//bool backed = (entry.filename[3] & 0x80) == 0x80 || (entry.extension[3] & 0x80) == 0x80;
int user = entry.statusUser & 0x0F;
bool validEntry = true;
for (int i = 0; i < 8; i++)
{
entry.filename[i] &= 0x7F;
validEntry &= entry.filename[i] >= 0x20;
}
for (int i = 0; i < 3; i++)
{
entry.extension[i] &= 0x7F;
validEntry &= entry.extension[i] >= 0x20;
}
if (!validEntry)
{
continue;
}
string filename = Encoding.ASCII.GetString(entry.filename).Trim();
string extension = Encoding.ASCII.GetString(entry.extension).Trim();
// If user is != 0, append user to name to have identical filenames
if (user > 0)
{
filename = $"{user:X1}:{filename}";
}
if (!string.IsNullOrEmpty(extension))
{
filename = filename + "." + extension;
}
int entryNo = (32 * entry.extentCounter + entry.extentCounterHigh) / (dpb.exm + 1);
// Do we have a stat for the file already?
if (statCache.TryGetValue(filename, out FileEntryInfo fInfo))
{
statCache.Remove(filename);
}
else
{
fInfo = new FileEntryInfo {
Attributes = new FileAttributes()
}
};
// And any extent?
if (fileExtents.TryGetValue(filename, out Dictionary <int, List <ushort> > extentBlocks))
{
fileExtents.Remove(filename);
}
else
{
extentBlocks = new Dictionary <int, List <ushort> >();
}
// Do we already have this extent? Should never happen
if (extentBlocks.TryGetValue(entryNo, out List <ushort> blocks))
{
extentBlocks.Remove(entryNo);
}
else
{
blocks = new List <ushort>();
}
// Attributes
if (hidden)
{
fInfo.Attributes |= FileAttributes.Hidden;
}
if (rdOnly)
{
fInfo.Attributes |= FileAttributes.ReadOnly;
}
if (system)
{
fInfo.Attributes |= FileAttributes.System;
}
// Supposedly there is a value in the directory entry telling how many blocks are designated in
// this entry. However some implementations tend to do whatever they wish, but none will ever
// allocate block 0 for a file because that's where the directory resides.
// There is also a field telling how many bytes are used in the last block, but its meaning is
// non-standard so we must ignore it.
foreach (ushort blk in entry.allocations.Where(blk => !blocks.Contains(blk) && blk != 0))
{
blocks.Add(blk);
}
// Save the file
fInfo.UID = (ulong)user;
extentBlocks.Add(entryNo, blocks);
fileExtents.Add(filename, extentBlocks);
statCache.Add(filename, fInfo);
// Add the file to the directory listing
if (!dirList.Contains(filename))
{
dirList.Add(filename);
}
// Count entries 3 by 3 for timestamps
switch (dirCnt % 3)
{
case 0:
file1 = filename;
break;
case 1:
file2 = filename;
break;
case 2:
file3 = filename;
break;
}
dirCnt++;
}
else
{
dirPtr = Marshal.AllocHGlobal(32);
Marshal.Copy(directory, dOff, dirPtr, 32);
DirectoryEntry entry = (DirectoryEntry)Marshal.PtrToStructure(dirPtr, typeof(DirectoryEntry));
Marshal.FreeHGlobal(dirPtr);
bool hidden = (entry.statusUser & 0x80) == 0x80;
bool rdOnly = (entry.filename[0] & 0x80) == 0x80 || (entry.extension[0] & 0x80) == 0x80;
bool system = (entry.filename[1] & 0x80) == 0x80 || (entry.extension[2] & 0x80) == 0x80;
//bool backed = (entry.filename[3] & 0x80) == 0x80 || (entry.extension[3] & 0x80) == 0x80;
int user = entry.statusUser & 0x0F;
bool validEntry = true;
for (int i = 0; i < 8; i++)
{
entry.filename[i] &= 0x7F;
validEntry &= entry.filename[i] >= 0x20;
}
for (int i = 0; i < 3; i++)
{
entry.extension[i] &= 0x7F;
validEntry &= entry.extension[i] >= 0x20;
}
if (!validEntry)
{
continue;
}
string filename = Encoding.ASCII.GetString(entry.filename).Trim();
string extension = Encoding.ASCII.GetString(entry.extension).Trim();
// If user is != 0, append user to name to have identical filenames
if (user > 0)
{
filename = $"{user:X1}:{filename}";
}
if (!string.IsNullOrEmpty(extension))
{
filename = filename + "." + extension;
}
int entryNo = (32 * entry.extentCounterHigh + entry.extentCounter) / (dpb.exm + 1);
// Do we have a stat for the file already?
if (statCache.TryGetValue(filename, out FileEntryInfo fInfo))
{
statCache.Remove(filename);
}
else
{
fInfo = new FileEntryInfo {
Attributes = new FileAttributes()
}
};
// And any extent?
if (fileExtents.TryGetValue(filename, out Dictionary <int, List <ushort> > extentBlocks))
{
fileExtents.Remove(filename);
}
else
{
extentBlocks = new Dictionary <int, List <ushort> >();
}
// Do we already have this extent? Should never happen
if (extentBlocks.TryGetValue(entryNo, out List <ushort> blocks))
{
extentBlocks.Remove(entryNo);
}
else
{
blocks = new List <ushort>();
}
// Attributes
if (hidden)
{
fInfo.Attributes |= FileAttributes.Hidden;
}
if (rdOnly)
{
fInfo.Attributes |= FileAttributes.ReadOnly;
}
if (system)
{
fInfo.Attributes |= FileAttributes.System;
}
// Supposedly there is a value in the directory entry telling how many blocks are designated in
// this entry. However some implementations tend to do whatever they wish, but none will ever
// allocate block 0 for a file because that's where the directory resides.
// There is also a field telling how many bytes are used in the last block, but its meaning is
// non-standard so we must ignore it.
foreach (ushort blk in entry.allocations.Cast <ushort>()
.Where(blk => !blocks.Contains(blk) && blk != 0))
{
blocks.Add(blk);
}
// Save the file
fInfo.UID = (ulong)user;
extentBlocks.Add(entryNo, blocks);
fileExtents.Add(filename, extentBlocks);
statCache.Add(filename, fInfo);
// Add the file to the directory listing
if (!dirList.Contains(filename))
{
dirList.Add(filename);
}
// Count entries 3 by 3 for timestamps
switch (dirCnt % 3)
{
case 0:
file1 = filename;
break;
case 1:
file2 = filename;
break;
case 2:
file3 = filename;
break;
}
dirCnt++;
}
}
// A password entry (or a file entry in PDOS, but this does not handle that case)
else if ((directory[dOff] & 0x7F) >= 0x10 && (directory[dOff] & 0x7F) < 0x20)
{
dirPtr = Marshal.AllocHGlobal(32);
Marshal.Copy(directory, dOff, dirPtr, 32);
PasswordEntry entry = (PasswordEntry)Marshal.PtrToStructure(dirPtr, typeof(PasswordEntry));
Marshal.FreeHGlobal(dirPtr);
int user = entry.userNumber & 0x0F;
for (int i = 0; i < 8; i++)
{
entry.filename[i] &= 0x7F;
}
for (int i = 0; i < 3; i++)
{
entry.extension[i] &= 0x7F;
}
string filename = Encoding.ASCII.GetString(entry.filename).Trim();
string extension = Encoding.ASCII.GetString(entry.extension).Trim();
// If user is != 0, append user to name to have identical filenames
if (user > 0)
{
filename = $"{user:X1}:{filename}";
}
if (!string.IsNullOrEmpty(extension))
{
filename = filename + "." + extension;
}
// Do not repeat passwords
if (passwordCache.ContainsKey(filename))
{
passwordCache.Remove(filename);
}
// Copy whole password entry
byte[] tmp = new byte[32];
Array.Copy(directory, dOff, tmp, 0, 32);
passwordCache.Add(filename, tmp);
// Count entries 3 by 3 for timestamps
switch (dirCnt % 3)
{
case 0:
file1 = filename;
break;
case 1:
file2 = filename;
break;
case 2:
file3 = filename;
break;
}
dirCnt++;
}
// Volume label and password entry. Volume password is ignored.
else
{
switch (directory[dOff] & 0x7F)
{
case 0x20:
LabelEntry labelEntry;
dirPtr = Marshal.AllocHGlobal(32);
Marshal.Copy(directory, dOff, dirPtr, 32);
labelEntry = (LabelEntry)Marshal.PtrToStructure(dirPtr, typeof(LabelEntry));
Marshal.FreeHGlobal(dirPtr);
// The volume label defines if one of the fields in CP/M 3 timestamp is a creation or an
// access time
atime |= (labelEntry.flags & 0x40) == 0x40;
label = Encoding.ASCII.GetString(directory, dOff + 1, 11).Trim();
labelCreationDate = new byte[4];
labelUpdateDate = new byte[4];
Array.Copy(directory, dOff + 24, labelCreationDate, 0, 4);
Array.Copy(directory, dOff + 28, labelUpdateDate, 0, 4);
// Count entries 3 by 3 for timestamps
switch (dirCnt % 3)
{
case 0:
file1 = null;
break;
case 1:
file2 = null;
break;
case 2:
file3 = null;
break;
}
dirCnt++;
break;
case 0x21:
if (directory[dOff + 10] == 0x00 && directory[dOff + 20] == 0x00 &&
directory[dOff + 30] == 0x00 && directory[dOff + 31] == 0x00)
{
dirPtr = Marshal.AllocHGlobal(32);
Marshal.Copy(directory, dOff, dirPtr, 32);
DateEntry dateEntry = (DateEntry)Marshal.PtrToStructure(dirPtr, typeof(DateEntry));
Marshal.FreeHGlobal(dirPtr);
FileEntryInfo fInfo;
// Entry contains timestamps for last 3 entries, whatever the kind they are.
if (!string.IsNullOrEmpty(file1))
{
if (statCache.TryGetValue(file1, out fInfo))
{
statCache.Remove(file1);
}
else
{
fInfo = new FileEntryInfo();
}
if (atime)
{
fInfo.AccessTime = DateHandlers.CpmToDateTime(dateEntry.date1);
}
else
{
fInfo.CreationTime = DateHandlers.CpmToDateTime(dateEntry.date1);
}
fInfo.LastWriteTime = DateHandlers.CpmToDateTime(dateEntry.date2);
statCache.Add(file1, fInfo);
}
if (!string.IsNullOrEmpty(file2))
{
if (statCache.TryGetValue(file2, out fInfo))
{
statCache.Remove(file2);
}
else
{
fInfo = new FileEntryInfo();
}
if (atime)
{
fInfo.AccessTime = DateHandlers.CpmToDateTime(dateEntry.date3);
}
else
{
fInfo.CreationTime = DateHandlers.CpmToDateTime(dateEntry.date3);
}
fInfo.LastWriteTime = DateHandlers.CpmToDateTime(dateEntry.date4);
statCache.Add(file2, fInfo);
}
if (!string.IsNullOrEmpty(file3))
{
if (statCache.TryGetValue(file3, out fInfo))
{
statCache.Remove(file3);
}
else
{
fInfo = new FileEntryInfo();
}
if (atime)
{
fInfo.AccessTime = DateHandlers.CpmToDateTime(dateEntry.date5);
}
else
{
fInfo.CreationTime = DateHandlers.CpmToDateTime(dateEntry.date5);
}
fInfo.LastWriteTime = DateHandlers.CpmToDateTime(dateEntry.date6);
statCache.Add(file3, fInfo);
}
file1 = null;
file2 = null;
file3 = null;
dirCnt = 0;
}
// However, if this byte is 0, timestamp is in Z80DOS or DOS+ format
else if (directory[dOff + 1] == 0x00)
{
dirPtr = Marshal.AllocHGlobal(32);
Marshal.Copy(directory, dOff, dirPtr, 32);
TrdPartyDateEntry trdPartyDateEntry =
(TrdPartyDateEntry)Marshal.PtrToStructure(dirPtr, typeof(TrdPartyDateEntry));
Marshal.FreeHGlobal(dirPtr);
FileEntryInfo fInfo;
// Entry contains timestamps for last 3 entries, whatever the kind they are.
if (!string.IsNullOrEmpty(file1))
{
if (statCache.TryGetValue(file1, out fInfo))
{
statCache.Remove(file1);
}
else
{
fInfo = new FileEntryInfo();
}
byte[] ctime = new byte[4];
ctime[0] = trdPartyDateEntry.create1[0];
ctime[1] = trdPartyDateEntry.create1[1];
fInfo.AccessTime = DateHandlers.CpmToDateTime(trdPartyDateEntry.access1);
fInfo.CreationTime = DateHandlers.CpmToDateTime(ctime);
fInfo.LastWriteTime = DateHandlers.CpmToDateTime(trdPartyDateEntry.modify1);
statCache.Add(file1, fInfo);
}
if (!string.IsNullOrEmpty(file2))
{
if (statCache.TryGetValue(file2, out fInfo))
{
statCache.Remove(file2);
}
else
{
fInfo = new FileEntryInfo();
}
byte[] ctime = new byte[4];
ctime[0] = trdPartyDateEntry.create2[0];
ctime[1] = trdPartyDateEntry.create2[1];
fInfo.AccessTime = DateHandlers.CpmToDateTime(trdPartyDateEntry.access2);
fInfo.CreationTime = DateHandlers.CpmToDateTime(ctime);
fInfo.LastWriteTime = DateHandlers.CpmToDateTime(trdPartyDateEntry.modify2);
statCache.Add(file2, fInfo);
}
if (!string.IsNullOrEmpty(file3))
{
if (statCache.TryGetValue(file1, out fInfo))
{
statCache.Remove(file3);
}
else
{
fInfo = new FileEntryInfo();
}
byte[] ctime = new byte[4];
ctime[0] = trdPartyDateEntry.create3[0];
ctime[1] = trdPartyDateEntry.create3[1];
fInfo.AccessTime = DateHandlers.CpmToDateTime(trdPartyDateEntry.access3);
fInfo.CreationTime = DateHandlers.CpmToDateTime(ctime);
fInfo.LastWriteTime = DateHandlers.CpmToDateTime(trdPartyDateEntry.modify3);
statCache.Add(file3, fInfo);
}
file1 = null;
file2 = null;
file3 = null;
dirCnt = 0;
}
break;
}
}
}
// Cache all files. As CP/M maximum volume size is 8 Mib
// this should not be a problem
DicConsole.DebugWriteLine("CP/M Plugin", "Reading files.");
long usedBlocks = 0;
fileCache = new Dictionary <string, byte[]>();
foreach (string filename in dirList)
{
MemoryStream fileMs = new MemoryStream();
if (statCache.TryGetValue(filename, out FileEntryInfo fInfo))
{
statCache.Remove(filename);
}
fInfo.Blocks = 0;
if (fileExtents.TryGetValue(filename, out Dictionary <int, List <ushort> > extents))
{
for (int ex = 0; ex < extents.Count; ex++)
{
if (!extents.TryGetValue(ex, out List <ushort> alBlks))
{
continue;
}
foreach (ushort alBlk in alBlks)
{
allocationBlocks.TryGetValue(alBlk, out byte[] blk);
fileMs.Write(blk, 0, blk.Length);
fInfo.Blocks++;
}
}
}
// If you insist to call CP/M "extent based"
fInfo.Attributes |= FileAttributes.Extents;
fInfo.BlockSize = blockSize;
fInfo.Length = fileMs.Length;
cpmStat.Files++;
usedBlocks += fInfo.Blocks;
statCache.Add(filename, fInfo);
fileCache.Add(filename, fileMs.ToArray());
}
decodedPasswordCache = new Dictionary <string, byte[]>();
// For each stored password, store a decoded version of it
if (passwordCache.Count > 0)
{
foreach (KeyValuePair <string, byte[]> kvp in passwordCache)
{
byte[] tmp = new byte[8];
Array.Copy(kvp.Value, 16, tmp, 0, 8);
for (int t = 0; t < 8; t++)
{
tmp[t] ^= kvp.Value[13];
}
decodedPasswordCache.Add(kvp.Key, tmp);
}
}
// Generate statfs.
cpmStat.Blocks = dpb.dsm + 1;
cpmStat.FilenameLength = 11;
cpmStat.Files = (ulong)fileCache.Count;
cpmStat.FreeBlocks = cpmStat.Blocks - usedBlocks;
cpmStat.PluginId = Id;
cpmStat.Type = "CP/M filesystem";
// Generate XML info
XmlFsType = new FileSystemType
{
Clusters = cpmStat.Blocks,
ClusterSize = blockSize,
Files = fileCache.Count,
FilesSpecified = true,
FreeClusters = cpmStat.FreeBlocks,
FreeClustersSpecified = true,
Type = "CP/M filesystem"
};
if (labelCreationDate != null)
{
XmlFsType.CreationDate = DateHandlers.CpmToDateTime(labelCreationDate);
XmlFsType.CreationDateSpecified = true;
}
if (labelUpdateDate != null)
{
XmlFsType.ModificationDate = DateHandlers.CpmToDateTime(labelUpdateDate);
XmlFsType.ModificationDateSpecified = true;
}
if (!string.IsNullOrEmpty(label))
{
XmlFsType.VolumeName = label;
}
mounted = true;
return(Errno.NoError);
}
/// <summary>
/// Mounts an Apple Lisa filesystem
/// </summary>
public Errno Mount(IMediaImage imagePlugin, Partition partition, Encoding encoding,
Dictionary <string, string> options, string @namespace)
{
XmlFsType = new FileSystemType();
if (options == null)
{
options = GetDefaultOptions();
}
if (options.TryGetValue("debug", out string debugString))
{
bool.TryParse(debugString, out debug);
}
// Default namespace
if (@namespace is null)
{
@namespace = "ecs";
}
switch (@namespace.ToLowerInvariant())
{
case "dos":
this.@namespace = Namespace.Dos;
break;
case "nt":
this.@namespace = Namespace.Nt;
break;
case "os2":
this.@namespace = Namespace.Os2;
break;
case "ecs":
this.@namespace = Namespace.Ecs;
break;
case "lfn":
this.@namespace = Namespace.Lfn;
break;
case "human":
this.@namespace = Namespace.Human;
break;
default: return(Errno.InvalidArgument);
}
DicConsole.DebugWriteLine("FAT plugin", "Reading BPB");
uint sectorsPerBpb = imagePlugin.Info.SectorSize < 512 ? 512 / imagePlugin.Info.SectorSize : 1;
byte[] bpbSector = imagePlugin.ReadSectors(0 + partition.Start, sectorsPerBpb);
BpbKind bpbKind = DetectBpbKind(bpbSector, imagePlugin, partition,
out BiosParameterBlockEbpb fakeBpb,
out HumanParameterBlock humanBpb, out AtariParameterBlock atariBpb,
out byte minBootNearJump, out bool andosOemCorrect,
out bool bootable);
fat12 = false;
fat16 = false;
fat32 = false;
useFirstFat = true;
XmlFsType.Bootable = bootable;
statfs = new FileSystemInfo
{
Blocks = XmlFsType.Clusters,
FilenameLength = 11,
Files = 0, // Requires traversing all directories
FreeFiles = 0,
PluginId = Id,
FreeBlocks = 0 // Requires traversing the FAT
};
// This is needed because for FAT16, GEMDOS increases bytes per sector count instead of using big_sectors field.
uint sectorsPerRealSector = 1;
// This is needed because some OSes don't put volume label as first entry in the root directory
uint sectorsForRootDirectory = 0;
uint rootDirectoryCluster = 0;
switch (bpbKind)
{
case BpbKind.DecRainbow:
case BpbKind.Hardcoded:
case BpbKind.Msx:
case BpbKind.Apricot:
fat12 = true;
break;
case BpbKind.ShortFat32:
case BpbKind.LongFat32:
{
fat32 = true;
Fat32ParameterBlock fat32Bpb =
Marshal.ByteArrayToStructureLittleEndian <Fat32ParameterBlock>(bpbSector);
Fat32ParameterBlockShort shortFat32Bpb =
Marshal.ByteArrayToStructureLittleEndian <Fat32ParameterBlockShort>(bpbSector);
rootDirectoryCluster = fat32Bpb.root_cluster;
// This is to support FAT partitions on hybrid ISO/USB images
if (imagePlugin.Info.XmlMediaType == XmlMediaType.OpticalDisc)
{
fat32Bpb.bps *= 4;
fat32Bpb.spc /= 4;
fat32Bpb.big_spfat /= 4;
fat32Bpb.hsectors /= 4;
fat32Bpb.sptrk /= 4;
}
XmlFsType.Type = fat32Bpb.version != 0 ? "FAT+" : "FAT32";
if (fat32Bpb.oem_name != null && (fat32Bpb.oem_name[5] != 0x49 || fat32Bpb.oem_name[6] != 0x48 ||
fat32Bpb.oem_name[7] != 0x43))
{
XmlFsType.SystemIdentifier = StringHandlers.CToString(fat32Bpb.oem_name);
}
sectorsPerCluster = fat32Bpb.spc;
XmlFsType.ClusterSize = (uint)(fat32Bpb.bps * fat32Bpb.spc);
reservedSectors = fat32Bpb.rsectors;
if (fat32Bpb.big_sectors == 0 && fat32Bpb.signature == 0x28)
{
XmlFsType.Clusters = shortFat32Bpb.huge_sectors / shortFat32Bpb.spc;
}
else
{
XmlFsType.Clusters = fat32Bpb.big_sectors / fat32Bpb.spc;
}
sectorsPerFat = fat32Bpb.big_spfat;
XmlFsType.VolumeSerial = $"{fat32Bpb.serial_no:X8}";
statfs.Id = new FileSystemId {
IsInt = true, Serial32 = fat32Bpb.serial_no
};
if ((fat32Bpb.flags & 0xF8) == 0x00)
{
if ((fat32Bpb.flags & 0x01) == 0x01)
{
XmlFsType.Dirty = true;
}
}
if ((fat32Bpb.mirror_flags & 0x80) == 0x80)
{
useFirstFat = (fat32Bpb.mirror_flags & 0xF) != 1;
}
if (fat32Bpb.signature == 0x29)
{
XmlFsType.VolumeName = Encoding.ASCII.GetString(fat32Bpb.volume_label);
}
// Check that jumps to a correct boot code position and has boot signature set.
// This will mean that the volume will boot, even if just to say "this is not bootable change disk"......
XmlFsType.Bootable =
fat32Bpb.jump[0] == 0xEB && fat32Bpb.jump[1] >= minBootNearJump && fat32Bpb.jump[1] < 0x80 ||
fat32Bpb.jump[0] == 0xE9 && fat32Bpb.jump.Length >= 3 &&
BitConverter.ToUInt16(fat32Bpb.jump, 1) >= minBootNearJump &&
BitConverter.ToUInt16(fat32Bpb.jump, 1) <= 0x1FC;
sectorsPerRealSector = fat32Bpb.bps / imagePlugin.Info.SectorSize;
sectorsPerCluster *= sectorsPerRealSector;
// First root directory sector
firstClusterSector =
(ulong)(fat32Bpb.big_spfat * fat32Bpb.fats_no + fat32Bpb.rsectors) * sectorsPerRealSector -
2 * sectorsPerCluster;
if (fat32Bpb.fsinfo_sector + partition.Start <= partition.End)
{
byte[] fsinfoSector = imagePlugin.ReadSector(fat32Bpb.fsinfo_sector + partition.Start);
FsInfoSector fsInfo =
Marshal.ByteArrayToStructureLittleEndian <FsInfoSector>(fsinfoSector);
if (fsInfo.signature1 == FSINFO_SIGNATURE1 && fsInfo.signature2 == FSINFO_SIGNATURE2 &&
fsInfo.signature3 == FSINFO_SIGNATURE3)
{
if (fsInfo.free_clusters < 0xFFFFFFFF)
{
XmlFsType.FreeClusters = fsInfo.free_clusters;
XmlFsType.FreeClustersSpecified = true;
}
}
}
break;
}
// Some fields could overflow fake BPB, those will be handled below
case BpbKind.Atari:
{
ushort sum = 0;
for (int i = 0; i < bpbSector.Length; i += 2)
{
sum += BigEndianBitConverter.ToUInt16(bpbSector, i);
}
// TODO: Check this
if (sum == 0x1234)
{
XmlFsType.Bootable = true;
}
break;
}
case BpbKind.Human:
// If not debug set Human68k namespace and ShiftJIS codepage as defaults
if (!debug)
{
this.@namespace = Namespace.Human;
encoding = Encoding.GetEncoding("shift_jis");
}
XmlFsType.Bootable = true;
break;
}
Encoding = encoding ?? (bpbKind == BpbKind.Human
? Encoding.GetEncoding("shift_jis")
: Encoding.GetEncoding("IBM437"));
ulong firstRootSector = 0;
if (!fat32)
{
// This is to support FAT partitions on hybrid ISO/USB images
if (imagePlugin.Info.XmlMediaType == XmlMediaType.OpticalDisc)
{
fakeBpb.bps *= 4;
fakeBpb.spc /= 4;
fakeBpb.spfat /= 4;
fakeBpb.hsectors /= 4;
fakeBpb.sptrk /= 4;
fakeBpb.rsectors /= 4;
if (fakeBpb.spc == 0)
{
fakeBpb.spc = 1;
}
}
// This assumes no sane implementation will violate cluster size rules
// However nothing prevents this to happen
// If first file on disk uses only one cluster there is absolutely no way to differentiate between FAT12 and FAT16,
// so let's hope implementations use common sense?
if (!fat12 && !fat16)
{
ulong clusters;
if (fakeBpb.sectors == 0)
{
clusters = fakeBpb.spc == 0 ? fakeBpb.big_sectors : fakeBpb.big_sectors / fakeBpb.spc;
}
else
{
clusters = fakeBpb.spc == 0 ? fakeBpb.sectors : (ulong)fakeBpb.sectors / fakeBpb.spc;
}
if (clusters < 4089)
{
fat12 = true;
}
else
{
fat16 = true;
}
}
if (fat12)
{
XmlFsType.Type = "FAT12";
}
else if (fat16)
{
XmlFsType.Type = "FAT16";
}
if (bpbKind == BpbKind.Atari)
{
if (atariBpb.serial_no[0] != 0x49 || atariBpb.serial_no[1] != 0x48 || atariBpb.serial_no[2] != 0x43)
{
XmlFsType.VolumeSerial =
$"{atariBpb.serial_no[0]:X2}{atariBpb.serial_no[1]:X2}{atariBpb.serial_no[2]:X2}";
statfs.Id = new FileSystemId
{
IsInt = true,
Serial32 = (uint)((atariBpb.serial_no[0] << 16) + (atariBpb.serial_no[1] << 8) +
atariBpb.serial_no[2])
};
}
XmlFsType.SystemIdentifier = StringHandlers.CToString(atariBpb.oem_name);
if (string.IsNullOrEmpty(XmlFsType.SystemIdentifier))
{
XmlFsType.SystemIdentifier = null;
}
}
else if (fakeBpb.oem_name != null)
{
if (fakeBpb.oem_name[5] != 0x49 || fakeBpb.oem_name[6] != 0x48 || fakeBpb.oem_name[7] != 0x43)
{
// Later versions of Windows create a DOS 3 BPB without OEM name on 8 sectors/track floppies
// OEM ID should be ASCII, otherwise ignore it
if (fakeBpb.oem_name[0] >= 0x20 && fakeBpb.oem_name[0] <= 0x7F && fakeBpb.oem_name[1] >= 0x20 &&
fakeBpb.oem_name[1] <= 0x7F && fakeBpb.oem_name[2] >= 0x20 && fakeBpb.oem_name[2] <= 0x7F &&
fakeBpb.oem_name[3] >= 0x20 && fakeBpb.oem_name[3] <= 0x7F && fakeBpb.oem_name[4] >= 0x20 &&
fakeBpb.oem_name[4] <= 0x7F && fakeBpb.oem_name[5] >= 0x20 && fakeBpb.oem_name[5] <= 0x7F &&
fakeBpb.oem_name[6] >= 0x20 && fakeBpb.oem_name[6] <= 0x7F && fakeBpb.oem_name[7] >= 0x20 &&
fakeBpb.oem_name[7] <= 0x7F)
{
XmlFsType.SystemIdentifier = StringHandlers.CToString(fakeBpb.oem_name);
}
else if (fakeBpb.oem_name[0] < 0x20 && fakeBpb.oem_name[1] >= 0x20 &&
fakeBpb.oem_name[1] <= 0x7F && fakeBpb.oem_name[2] >= 0x20 &&
fakeBpb.oem_name[2] <= 0x7F && fakeBpb.oem_name[3] >= 0x20 &&
fakeBpb.oem_name[3] <= 0x7F && fakeBpb.oem_name[4] >= 0x20 &&
fakeBpb.oem_name[4] <= 0x7F && fakeBpb.oem_name[5] >= 0x20 &&
fakeBpb.oem_name[5] <= 0x7F && fakeBpb.oem_name[6] >= 0x20 &&
fakeBpb.oem_name[6] <= 0x7F && fakeBpb.oem_name[7] >= 0x20 &&
fakeBpb.oem_name[7] <= 0x7F)
{
XmlFsType.SystemIdentifier = StringHandlers.CToString(fakeBpb.oem_name, Encoding, start: 1);
}
}
if (fakeBpb.signature == 0x28 || fakeBpb.signature == 0x29)
{
XmlFsType.VolumeSerial = $"{fakeBpb.serial_no:X8}";
statfs.Id = new FileSystemId {
IsInt = true, Serial32 = fakeBpb.serial_no
};
}
}
if (bpbKind != BpbKind.Human)
{
if (fakeBpb.sectors == 0)
{
XmlFsType.Clusters = fakeBpb.spc == 0 ? fakeBpb.big_sectors : fakeBpb.big_sectors / fakeBpb.spc;
}
else
{
XmlFsType.Clusters =
(ulong)(fakeBpb.spc == 0 ? fakeBpb.sectors : fakeBpb.sectors / fakeBpb.spc);
}
}
else
{
XmlFsType.Clusters = humanBpb.clusters == 0 ? humanBpb.big_clusters : humanBpb.clusters;
}
sectorsPerCluster = fakeBpb.spc;
XmlFsType.ClusterSize = (uint)(fakeBpb.bps * fakeBpb.spc);
reservedSectors = fakeBpb.rsectors;
sectorsPerFat = fakeBpb.spfat;
if (fakeBpb.signature == 0x28 || fakeBpb.signature == 0x29 || andosOemCorrect)
{
if ((fakeBpb.flags & 0xF8) == 0x00)
{
if ((fakeBpb.flags & 0x01) == 0x01)
{
XmlFsType.Dirty = true;
}
}
if (fakeBpb.signature == 0x29 || andosOemCorrect)
{
XmlFsType.VolumeName = Encoding.ASCII.GetString(fakeBpb.volume_label);
}
}
// Workaround that PCExchange jumps into "FAT16 "...
if (XmlFsType.SystemIdentifier == "PCX 2.0 ")
{
fakeBpb.jump[1] += 8;
}
// Check that jumps to a correct boot code position and has boot signature set.
// This will mean that the volume will boot, even if just to say "this is not bootable change disk"......
if (XmlFsType.Bootable == false && fakeBpb.jump != null)
{
XmlFsType.Bootable |=
fakeBpb.jump[0] == 0xEB && fakeBpb.jump[1] >= minBootNearJump && fakeBpb.jump[1] < 0x80 ||
fakeBpb.jump[0] == 0xE9 && fakeBpb.jump.Length >= 3 &&
BitConverter.ToUInt16(fakeBpb.jump, 1) >= minBootNearJump &&
BitConverter.ToUInt16(fakeBpb.jump, 1) <= 0x1FC;
}
// First root directory sector
firstRootSector = (ulong)(fakeBpb.spfat * fakeBpb.fats_no + fakeBpb.rsectors) * sectorsPerRealSector +
partition.Start;
sectorsForRootDirectory = (uint)(fakeBpb.root_ent * 32 / imagePlugin.Info.SectorSize);
sectorsPerRealSector = fakeBpb.bps / imagePlugin.Info.SectorSize;
sectorsPerCluster *= sectorsPerRealSector;
}
firstClusterSector += partition.Start;
image = imagePlugin;
if (fat32)
{
fatEntriesPerSector = imagePlugin.Info.SectorSize / 4;
}
else if (fat16)
{
fatEntriesPerSector = imagePlugin.Info.SectorSize / 2;
}
else
{
fatEntriesPerSector = imagePlugin.Info.SectorSize * 2 / 3;
}
fatFirstSector = partition.Start + reservedSectors * sectorsPerRealSector;
rootDirectoryCache = new Dictionary <string, CompleteDirectoryEntry>();
byte[] rootDirectory = null;
if (!fat32)
{
firstClusterSector = firstRootSector + sectorsForRootDirectory - sectorsPerCluster * 2;
rootDirectory = imagePlugin.ReadSectors(firstRootSector, sectorsForRootDirectory);
if (bpbKind == BpbKind.DecRainbow)
{
MemoryStream rootMs = new MemoryStream();
foreach (byte[] tmp in from ulong rootSector in new[] { 0x17, 0x19, 0x1B, 0x1D, 0x1E, 0x20 }
select imagePlugin.ReadSector(rootSector))
{
rootMs.Write(tmp, 0, tmp.Length);
}
rootDirectory = rootMs.ToArray();
}
}
else
{
if (rootDirectoryCluster == 0)
{
return(Errno.InvalidArgument);
}
MemoryStream rootMs = new MemoryStream();
uint[] rootDirectoryClusters = GetClusters(rootDirectoryCluster);
foreach (uint cluster in rootDirectoryClusters)
{
byte[] buffer =
imagePlugin.ReadSectors(firstClusterSector + cluster * sectorsPerCluster, sectorsPerCluster);
rootMs.Write(buffer, 0, buffer.Length);
}
rootDirectory = rootMs.ToArray();
// OS/2 FAT32.IFS uses LFN instead of .LONGNAME
if (this.@namespace == Namespace.Os2)
{
this.@namespace = Namespace.Os2;
}
}
if (rootDirectory is null)
{
return(Errno.InvalidArgument);
}
byte[] lastLfnName = null;
byte lastLfnChecksum = 0;
for (int i = 0; i < rootDirectory.Length; i += Marshal.SizeOf <DirectoryEntry>())
{
DirectoryEntry entry =
Marshal.ByteArrayToStructureLittleEndian <DirectoryEntry>(rootDirectory, i,
Marshal.SizeOf <DirectoryEntry>());
if (entry.filename[0] == DIRENT_FINISHED)
{
break;
}
if (entry.attributes.HasFlag(FatAttributes.LFN))
{
if (this.@namespace != Namespace.Lfn && this.@namespace != Namespace.Ecs)
{
continue;
}
LfnEntry lfnEntry =
Marshal.ByteArrayToStructureLittleEndian <LfnEntry>(rootDirectory, i,
Marshal.SizeOf <LfnEntry>());
int lfnSequence = lfnEntry.sequence & LFN_MASK;
if ((lfnEntry.sequence & LFN_ERASED) > 0)
{
continue;
}
if ((lfnEntry.sequence & LFN_LAST) > 0)
{
lastLfnName = new byte[lfnSequence * 26];
lastLfnChecksum = lfnEntry.checksum;
}
if (lastLfnName is null)
{
continue;
}
if (lfnEntry.checksum != lastLfnChecksum)
{
continue;
}
lfnSequence--;
Array.Copy(lfnEntry.name1, 0, lastLfnName, lfnSequence * 26, 10);
Array.Copy(lfnEntry.name2, 0, lastLfnName, lfnSequence * 26 + 10, 12);
Array.Copy(lfnEntry.name3, 0, lastLfnName, lfnSequence * 26 + 22, 4);
continue;
}
// Not a correct entry
if (entry.filename[0] < DIRENT_MIN && entry.filename[0] != DIRENT_E5)
{
continue;
}
// Self
if (Encoding.GetString(entry.filename).TrimEnd() == ".")
{
continue;
}
// Parent
if (Encoding.GetString(entry.filename).TrimEnd() == "..")
{
continue;
}
// Deleted
if (entry.filename[0] == DIRENT_DELETED)
{
continue;
}
string filename;
if (entry.attributes.HasFlag(FatAttributes.VolumeLabel))
{
byte[] fullname = new byte[11];
Array.Copy(entry.filename, 0, fullname, 0, 8);
Array.Copy(entry.extension, 0, fullname, 8, 3);
string volname = Encoding.GetString(fullname).Trim();
if (!string.IsNullOrEmpty(volname))
{
XmlFsType.VolumeName =
entry.caseinfo.HasFlag(CaseInfo.AllLowerCase) && this.@namespace == Namespace.Nt
? volname.ToLower()
: volname;
}
if (entry.ctime > 0 && entry.cdate > 0)
{
XmlFsType.CreationDate = DateHandlers.DosToDateTime(entry.cdate, entry.ctime);
if (entry.ctime_ms > 0)
{
XmlFsType.CreationDate = XmlFsType.CreationDate.AddMilliseconds(entry.ctime_ms * 10);
}
XmlFsType.CreationDateSpecified = true;
}
if (entry.mtime > 0 && entry.mdate > 0)
{
XmlFsType.ModificationDate = DateHandlers.DosToDateTime(entry.mdate, entry.mtime);
XmlFsType.ModificationDateSpecified = true;
}
continue;
}
CompleteDirectoryEntry completeEntry = new CompleteDirectoryEntry {
Dirent = entry
};
if ((this.@namespace == Namespace.Lfn || this.@namespace == Namespace.Ecs) && lastLfnName != null)
{
byte calculatedLfnChecksum = LfnChecksum(entry.filename, entry.extension);
if (calculatedLfnChecksum == lastLfnChecksum)
{
filename = StringHandlers.CToString(lastLfnName, Encoding.Unicode, true);
completeEntry.Lfn = filename;
lastLfnName = null;
lastLfnChecksum = 0;
}
}
if (entry.filename[0] == DIRENT_E5)
{
entry.filename[0] = DIRENT_DELETED;
}
string name = Encoding.GetString(entry.filename).TrimEnd();
string extension = Encoding.GetString(entry.extension).TrimEnd();
if (this.@namespace == Namespace.Nt)
{
if (entry.caseinfo.HasFlag(CaseInfo.LowerCaseExtension))
{
extension = extension.ToLower(CultureInfo.CurrentCulture);
}
if (entry.caseinfo.HasFlag(CaseInfo.LowerCaseBasename))
{
name = name.ToLower(CultureInfo.CurrentCulture);
}
}
if (extension != "")
{
filename = name + "." + extension;
}
else
{
filename = name;
}
completeEntry.Shortname = filename;
if (this.@namespace == Namespace.Human)
{
HumanDirectoryEntry humanEntry =
Marshal.ByteArrayToStructureLittleEndian <HumanDirectoryEntry>(rootDirectory, i,
Marshal
.SizeOf <HumanDirectoryEntry
>());
completeEntry.HumanDirent = humanEntry;
name = StringHandlers.CToString(humanEntry.name1, Encoding).TrimEnd();
extension = StringHandlers.CToString(humanEntry.extension, Encoding).TrimEnd();
string name2 = StringHandlers.CToString(humanEntry.name2, Encoding).TrimEnd();
if (extension != "")
{
filename = name + name2 + "." + extension;
}
else
{
filename = name + name2;
}
completeEntry.HumanName = filename;
}
if (!fat32 && filename == "EA DATA. SF")
{
eaDirEntry = entry;
lastLfnName = null;
lastLfnChecksum = 0;
if (debug)
{
rootDirectoryCache[completeEntry.ToString()] = completeEntry;
}
continue;
}
rootDirectoryCache[completeEntry.ToString()] = completeEntry;
lastLfnName = null;
lastLfnChecksum = 0;
}
XmlFsType.VolumeName = XmlFsType.VolumeName?.Trim();
statfs.Blocks = XmlFsType.Clusters;
switch (bpbKind)
{
case BpbKind.Hardcoded:
statfs.Type = $"Microsoft FAT{(fat16 ? "16" : "12")}";
break;
case BpbKind.Atari:
statfs.Type = $"Atari FAT{(fat16 ? "16" : "12")}";
break;
case BpbKind.Msx:
statfs.Type = $"MSX FAT{(fat16 ? "16" : "12")}";
break;
case BpbKind.Dos2:
case BpbKind.Dos3:
case BpbKind.Dos32:
case BpbKind.Dos33:
case BpbKind.ShortExtended:
case BpbKind.Extended:
statfs.Type = $"Microsoft FAT{(fat16 ? "16" : "12")}";
break;
case BpbKind.ShortFat32:
case BpbKind.LongFat32:
statfs.Type = XmlFsType.Type == "FAT+" ? "FAT+" : "Microsoft FAT32";
break;
case BpbKind.Andos:
statfs.Type = $"ANDOS FAT{(fat16 ? "16" : "12")}";
break;
case BpbKind.Apricot:
statfs.Type = $"Apricot FAT{(fat16 ? "16" : "12")}";
break;
case BpbKind.DecRainbow:
statfs.Type = $"DEC FAT{(fat16 ? "16" : "12")}";
break;
case BpbKind.Human:
statfs.Type = $"Human68k FAT{(fat16 ? "16" : "12")}";
break;
default: throw new ArgumentOutOfRangeException();
}
bytesPerCluster = sectorsPerCluster * imagePlugin.Info.SectorSize;
if (fat12)
{
byte[] fatBytes =
imagePlugin.ReadSectors(fatFirstSector + (useFirstFat ? 0 : sectorsPerFat), sectorsPerFat);
fatEntries = new ushort[statfs.Blocks];
int pos = 0;
for (int i = 0; i + 3 < fatBytes.Length && pos < fatEntries.Length; i += 3)
{
fatEntries[pos++] = (ushort)(((fatBytes[i + 1] & 0xF) << 8) + fatBytes[i + 0]);
fatEntries[pos++] = (ushort)(((fatBytes[i + 1] & 0xF0) >> 4) + (fatBytes[i + 2] << 4));
}
}
else if (fat16)
{
DicConsole.DebugWriteLine("FAT plugin", "Reading FAT16");
byte[] fatBytes =
imagePlugin.ReadSectors(fatFirstSector + (useFirstFat ? 0 : sectorsPerFat), sectorsPerFat);
DicConsole.DebugWriteLine("FAT plugin", "Casting FAT");
fatEntries = MemoryMarshal.Cast <byte, ushort>(fatBytes).ToArray();
}
// TODO: Check how this affects international filenames
cultureInfo = new CultureInfo("en-US", false);
directoryCache = new Dictionary <string, Dictionary <string, CompleteDirectoryEntry> >();
// Check it is really an OS/2 EA file
if (eaDirEntry.start_cluster != 0)
{
CacheEaData();
ushort eamagic = BitConverter.ToUInt16(cachedEaData, 0);
if (eamagic != EADATA_MAGIC)
{
eaDirEntry = new DirectoryEntry();
cachedEaData = null;
}
else
{
eaCache = new Dictionary <string, Dictionary <string, byte[]> >();
}
}
else if (fat32)
{
eaCache = new Dictionary <string, Dictionary <string, byte[]> >();
}
// Check OS/2 .LONGNAME
if (eaCache != null && (this.@namespace == Namespace.Os2 || this.@namespace == Namespace.Ecs))
{
List <KeyValuePair <string, CompleteDirectoryEntry> > rootFilesWithEas =
rootDirectoryCache.Where(t => t.Value.Dirent.ea_handle != 0).ToList();
foreach (KeyValuePair <string, CompleteDirectoryEntry> fileWithEa in rootFilesWithEas)
{
Dictionary <string, byte[]> eas = GetEas(fileWithEa.Value.Dirent.ea_handle);
if (eas is null)
{
continue;
}
if (!eas.TryGetValue("com.microsoft.os2.longname", out byte[] longnameEa))
