public FatStream(FatDirectoryEntry entry)
{
DirectoryEntry = entry ?? throw new ArgumentNullException(nameof(entry));
FS = entry.GetFileSystem();
FatTable = entry.GetFatTable();
Size = entry.Size;
if (FatTable == null)
{
throw new Exception("The fat chain returned for the directory entry was null.");
}
}
public FatDirectoryEntry(FatFileSystem fileSystem, FatDirectoryEntry parent, string fullPath, long size, string name, uint firstCluster)
: base(fileSystem, parent, fullPath, name, size, DirectoryEntryType.Directory)
{
if (firstCluster < fileSystem.RootCluster)
{
throw new ArgumentOutOfRangeException(nameof(firstCluster));
}
FirstClusterNum = firstCluster;
EntryHeaderDataOffset = 0;
}
public FatDirectoryEntry FindVolumeId()
{
if (!IsRootDirectory())
{
throw new Exception("VolumeId can be found only in Root Directory");
}
var data = GetDirectoryEntryData();
var parent = this;
FatDirectoryEntry result = null;
for (var i = 0; i < data.Length; i += 32)
{
var attrib = data[i + 11];
if (attrib != FatDirectoryEntryAttributes.VolumeID)
{
continue;
}
// The Label in FAT could be only a shortName (limited to 11 characters) so it is more easy
var name = Encoding.ASCII.GetString(data, i, 11);
name = name.TrimEnd();
var fullPath = Path.Combine(FullPath, name);
// Probably can be OK to hardcode 0 here
var size = BitConverter.ToUInt32(data, i + 28);
//var firstCluster = (uint)(data.ToUInt16(i + 20) << 16 | data.ToUInt16(i + 26));
var firstCluster = parent.FirstClusterNum;
result = new FatDirectoryEntry(((FatFileSystem)FileSystem), parent, fullPath, name, size, firstCluster, (uint)i, DirectoryEntryType.File);
break;
}
if (result == null)
{
Debugger.Log(0, "FileSystem", $"VolumeID not found, returning null");
}
return(result);
}
/// <summary>
/// Retrieves a <see cref="List{T}"/> of <see cref="FatDirectoryEntry"/> objects that represent the Directory Entries inside this Directory
/// </summary>
/// <returns>Returns a <see cref="List{T}"/> of the Directory Entries inside this Directory</returns>
public List <FatDirectoryEntry> ReadDirectoryContents(bool returnShortFilenames = false)
{
var data = GetDirectoryEntryData();
var result = new List <FatDirectoryEntry>();
FatDirectoryEntry parent = this;
//TODO: Change longName to StringBuilder
var longName = string.Empty;
var name = string.Empty;
for (var i = 0; i < data.Length; i += 32)
{
var attrib = data[i + 11];
var status = data[i];
if (attrib == FatDirectoryEntryAttributes.LongName)
{
var type = data[i + 12];
if (returnShortFilenames)
{
continue;
}
if (status == FatDirectoryEntryAttributes.UnusedOrDeletedEntry)
{
Debugger.Log(0, "FileSystem", $"<DELETED> : Attrib = {attrib}, Status = {status}");
continue;
}
if (type == 0)
{
if ((status & 0x40) > 0)
{
longName = string.Empty;
}
// TODO: Check LDIR_Ord for ordering and throw exception if entries are found out of order.
// Also save buffer and only copy name if a end Ord marker is found.
var longPart = Encoding.Unicode.GetString(data, i + 1, 10);
// We have to check the length because 0xFFFF is a valid Unicode codepoint. So we only want to stop if the 0xFFFF is AFTER a 0x0000. We can determin
// this by also looking at the length. Since we short circuit the or, the length is rarely evaluated.
if (BitConverter.ToUInt16(data, i + 14) != 0xFFFF || longPart.Length == 5)
{
longPart += Encoding.Unicode.GetString(data, i + 14, 12);
if (BitConverter.ToUInt16(data, i + 28) != 0xFFFF || longPart.Length == 11)
{
longPart += Encoding.Unicode.GetString(data, i + 28, 4);
}
}
longName = longPart + longName;
longPart = null;
//TODO: LDIR_Chksum
}
}
else
{
name = longName;
if (status == 0x00)
{
Debugger.Log(0, "FileSystem", $"<EOF> : Attrib = {attrib}, Status = {status}");
break;
}
switch (status)
{
case 0x05: break; // Japanese characters - We dont handle these
case 0x2E: continue; // Dot entry
case FatDirectoryEntryAttributes.UnusedOrDeletedEntry: continue; // Empty slot, skip it
default:
var test = attrib & (FatDirectoryEntryAttributes.Directory | FatDirectoryEntryAttributes.VolumeID);
if (status >= 0x20)
{
if (longName.Length > 0)
{
// Leading and trailing spaces are to be ignored according to spec.
// Many programs (including Windows) pad trailing spaces although it is not required for long names.
// As per spec, ignore trailing periods
name = longName.Trim(new[] { '\0', '\uffff' }).Trim();
// If there are trailing periods
var nameIndex = name.Length - 1;
if (name[nameIndex] == '.')
{
// Search backwards till we find the first non-period character
for (; nameIndex > 0; nameIndex--)
{
if (name[nameIndex] != '.')
{
break;
}
}
// Substring to remove the periods
name = name.Substring(0, nameIndex + 1);
}
longName = string.Empty;
}
else if (test == 0)
{
var entry = Encoding.ASCII.GetString(data, i, 11);
name = entry.Substring(0, 8).TrimEnd();
var ext = entry.Substring(8, 3).TrimEnd();
if (ext.Length > 0)
{
name = name + "." + ext;
}
}
else
{
name = Encoding.ASCII.GetString(data, i, 11).TrimEnd();
}
}
var firstCluster = (uint)(BitConverter.ToUInt16(data, i + 20) << 16 | BitConverter.ToUInt16(data, i + 26));
if (test == 0)
{
var size = BitConverter.ToUInt32(data, i + 28);
if (size == 0 && name.Length == 0)
{
continue;
}
var fullPath = Path.Combine(FullPath, name);
var entry = new FatDirectoryEntry(((FatFileSystem)FileSystem), parent, fullPath, name, size, firstCluster, (uint)i, DirectoryEntryType.File);
result.Add(entry);
}
else if (test == FatDirectoryEntryAttributes.Directory)
{
var fullPath = Path.Combine(FullPath, name);
var size = BitConverter.ToUInt32(data, (int)i + 28);
var entry = new FatDirectoryEntry(((FatFileSystem)FileSystem), parent, fullPath, name, size, firstCluster, (uint)i, DirectoryEntryType.Directory);
result.Add(entry);
}
else if (test == FatDirectoryEntryAttributes.VolumeID)
{
Debugger.Log(0, "FileSystem", $"<VOLUME ID> : Attrib = {attrib}, Status = {status}");
}
else
{
Debugger.Log(0, "FileSystem", $"<INVALID ENTRY> : Attrib = {attrib}, Status = {status}");
}
break;
}
}
}
return(result);
}
public FatDirectoryEntry AddDirectoryEntry(string name, DirectoryEntryType entryType)
{
if (entryType == DirectoryEntryType.Directory || entryType == DirectoryEntryType.File)
{
var shortName = name;
uint[] directoryEntriesToAllocate = null;
var x1 = entryType == DirectoryEntryType.File;
var x2 = name.Contains(".");
var x3 = x2 ? name.Substring(0, name.LastIndexOf('.')).Contains(".") : false;
var x4 = x2 ? name.Substring(0, name.IndexOf('.')).Length > 8 : false;
var x5 = x2 ? name.Substring(name.IndexOf('.') + 1).Length > 3 : false;
var x6 = entryType == DirectoryEntryType.Directory;
var x7 = name.Length > 11;
var x8 = x3 || (x4 || x5);
var x9 = x2 && x8;
var x10 = (x1 && x9) || (x6 && x7);
if (x10)
{
var longName = name;
var lastPeriodPosition = name.LastIndexOf('.');
var ext = string.Empty;
// Only take the name until the first dot
if (lastPeriodPosition + 1 > 0 && lastPeriodPosition + 1 < name.Length)
{
ext = shortName.Substring(lastPeriodPosition + 1);
}
// Remove all whitespaces and dots (except final)
for (var i = shortName.Length - 1; i > 0; i--)
{
var c = shortName[i];
if (char.IsWhiteSpace(c) || (c == '.' && i != lastPeriodPosition))
{
shortName.Remove(i, 1);
}
}
var invalidShortNameChars = new[] { '"', '*', '+', ',', '.', '/', ':', ';', '<', '=', '>', '?', '[', '\\', ']', '|' };
// Remove all invalid characters
foreach (var invalidChar in invalidShortNameChars)
{
shortName.Replace(invalidChar, '_');
}
var n = 1;
var directoryEntries = ReadDirectoryContents(true);
var shortFilenames = new string[directoryEntries.Count];
for (var i = 0; i < directoryEntries.Count; i++)
{
shortFilenames[i] = directoryEntries[i].Name;
}
var nameTry = string.Empty;
var test = false;
do
{
nameTry = (shortName.Substring(0, 7 - n.ToString().Length) + "~" + n).ToUpperInvariant();
if (!string.IsNullOrEmpty(ext))
{
nameTry += '.' + ext.ToUpperInvariant();
}
n++;
test = false;
foreach (var name2 in shortFilenames)
{
if (name2 == nameTry)
{
test = true;
break;
}
}
}
//while (Array.IndexOf((Array)xShortFilenames, xNameTry) != -1); //TODO: use the generic version of IndexOf, just remove the cast to Array
while (test);
shortName = nameTry;
var checksum = CalculateChecksum(GetShortName(shortName));
var numEntries = (int)Math.Ceiling(longName.Length / 13d);
var longNameWithPad = new char[numEntries * 13];
longNameWithPad[longNameWithPad.Length - 1] = (char)0xFFFF;
Array.Copy(longName.ToCharArray(), longNameWithPad, longName.Length);
directoryEntriesToAllocate = GetNextUnallocatedDirectoryEntries(numEntries + 1);
for (var i = numEntries - 1; i >= 0; i--)
{
var entry = directoryEntriesToAllocate[numEntries - i - 1];
SetLongFilenameEntryMetadataValue(entry, FatDirectoryEntryMetadata.LongFilenameEntryMetadata.SequenceNumberAndAllocationStatus, (i + 1) | (i == numEntries - 1 ? (1 << 6) : 0));
SetLongFilenameEntryMetadataValue(entry, FatDirectoryEntryMetadata.LongFilenameEntryMetadata.Attributes, FatDirectoryEntryAttributes.LongName);
SetLongFilenameEntryMetadataValue(entry, FatDirectoryEntryMetadata.LongFilenameEntryMetadata.Checksum, checksum);
var a1 = new string(longNameWithPad, i * 13, 5);
var a2 = new string(longNameWithPad, i * 13 + 5, 6);
var a3 = new string(longNameWithPad, i * 13 + 11, 2);
SetLongFilenameEntryMetadataValue(entry, FatDirectoryEntryMetadata.LongFilenameEntryMetadata.LongName1, a1);
SetLongFilenameEntryMetadataValue(entry, FatDirectoryEntryMetadata.LongFilenameEntryMetadata.LongName2, a2);
SetLongFilenameEntryMetadataValue(entry, FatDirectoryEntryMetadata.LongFilenameEntryMetadata.LongName3, a3);
}
}
var fullPath = Path.Combine(FullPath, name);
var firstCluster = ((FatFileSystem)FileSystem).GetFat(0).GetNextUnallocatedFatEntry();
var entryHeaderDataOffset = directoryEntriesToAllocate == null?GetNextUnallocatedDirectoryEntry() : directoryEntriesToAllocate[directoryEntriesToAllocate.Length - 1];
var newEntry = new FatDirectoryEntry((FatFileSystem)FileSystem, this, fullPath, name, 0, firstCluster, entryHeaderDataOffset, entryType);
newEntry.AllocateDirectoryEntry(shortName);
return(newEntry);
}
throw new ArgumentOutOfRangeException(nameof(entryType), "Unknown directory entry type.");
}
