internal DirectoryEntry(DirectoryEntry toCopy)
{
_options = toCopy._options;
_name = toCopy._name;
_attr = toCopy._attr;
_creationTimeTenth = toCopy._creationTimeTenth;
_creationTime = toCopy._creationTime;
_creationDate = toCopy._creationDate;
_lastAccessDate = toCopy._lastAccessDate;
_firstClusterHi = toCopy._firstClusterHi;
_lastWriteTime = toCopy._lastWriteTime;
_firstClusterLo = toCopy._firstClusterLo;
_fileSize = toCopy._fileSize;
}
internal void ForgetDirectory(DirectoryEntry entry)
{
uint index = entry.FirstCluster;
if (index != 0 && _dirCache.ContainsKey(index))
{
Directory dir = _dirCache[index];
_dirCache.Remove(index);
dir.Dispose();
}
}
/// <summary>
/// Moves a file, allowing an existing file to be overwritten.
/// </summary>
/// <param name="sourceName">The file to move.</param>
/// <param name="destinationName">The target file name.</param>
/// <param name="overwrite">Whether to permit a destination file to be overwritten</param>
public override void MoveFile(string sourceName, string destinationName, bool overwrite)
{
Directory sourceDir;
long sourceEntryId = GetDirectoryEntry(sourceName, out sourceDir);
if (sourceDir == null || sourceEntryId < 0)
{
throw new FileNotFoundException(string.Format(CultureInfo.InvariantCulture, "The source file '{0}' was not found", sourceName));
}
DirectoryEntry sourceEntry = sourceDir.GetEntry(sourceEntryId);
if ((sourceEntry.Attributes & FatAttributes.Directory) != 0)
{
throw new IOException("The source file is a directory");
}
DirectoryEntry newEntry = new DirectoryEntry(sourceEntry);
newEntry.Name = FileName.FromPath(destinationName, FatOptions.FileNameEncoding);
Directory destDir;
long destEntryId = GetDirectoryEntry(destinationName, out destDir);
if (destDir == null)
{
throw new DirectoryNotFoundException(string.Format(CultureInfo.InvariantCulture, "The destination directory for '{0}' was not found", destinationName));
}
// If the destination is a directory, use the old file name to construct a full path.
if (destEntryId >= 0)
{
DirectoryEntry destEntry = destDir.GetEntry(destEntryId);
if ((destEntry.Attributes & FatAttributes.Directory) != 0)
{
newEntry.Name = FileName.FromPath(sourceName, FatOptions.FileNameEncoding);
destinationName = Utilities.CombinePaths(destinationName, Utilities.GetFileFromPath(sourceName));
destEntryId = GetDirectoryEntry(destinationName, out destDir);
}
}
// If there's an existing entry...
if (destEntryId >= 0)
{
DirectoryEntry destEntry = destDir.GetEntry(destEntryId);
if ((destEntry.Attributes & FatAttributes.Directory) != 0)
{
throw new IOException("Destination file is an existing directory");
}
if (!overwrite)
{
throw new IOException("Destination file already exists");
}
// Remove the old file
destDir.DeleteEntry(destEntryId, true);
}
// Add the new file's entry and remove the old link to the file's contents
destDir.AddEntry(newEntry);
sourceDir.DeleteEntry(sourceEntryId, false);
}
/// <summary>
/// Copies an existing file to a new file, allowing overwriting of an existing file.
/// </summary>
/// <param name="sourceFile">The source file</param>
/// <param name="destinationFile">The destination file</param>
/// <param name="overwrite">Whether to permit over-writing of an existing file.</param>
public override void CopyFile(string sourceFile, string destinationFile, bool overwrite)
{
Directory sourceDir;
long sourceEntryId = GetDirectoryEntry(sourceFile, out sourceDir);
if (sourceDir == null || sourceEntryId < 0)
{
throw new FileNotFoundException(string.Format(CultureInfo.InvariantCulture, "The source file '{0}' was not found", sourceFile));
}
DirectoryEntry sourceEntry = sourceDir.GetEntry(sourceEntryId);
if ((sourceEntry.Attributes & FatAttributes.Directory) != 0)
{
throw new IOException("The source file is a directory");
}
DirectoryEntry newEntry = new DirectoryEntry(sourceEntry);
newEntry.Name = FileName.FromPath(destinationFile, FatOptions.FileNameEncoding);
newEntry.FirstCluster = 0;
Directory destDir;
long destEntryId = GetDirectoryEntry(destinationFile, out destDir);
if (destDir == null)
{
throw new DirectoryNotFoundException(string.Format(CultureInfo.InvariantCulture, "The destination directory for '{0}' was not found", destinationFile));
}
// If the destination is a directory, use the old file name to construct a full path.
if (destEntryId >= 0)
{
DirectoryEntry destEntry = destDir.GetEntry(destEntryId);
if ((destEntry.Attributes & FatAttributes.Directory) != 0)
{
newEntry.Name = FileName.FromPath(sourceFile, FatOptions.FileNameEncoding);
destinationFile = Utilities.CombinePaths(destinationFile, Utilities.GetFileFromPath(sourceFile));
destEntryId = GetDirectoryEntry(destinationFile, out destDir);
}
}
// If there's an existing entry...
if (destEntryId >= 0)
{
DirectoryEntry destEntry = destDir.GetEntry(destEntryId);
if ((destEntry.Attributes & FatAttributes.Directory) != 0)
{
throw new IOException("Destination file is an existing directory");
}
if (!overwrite)
{
throw new IOException("Destination file already exists");
}
// Remove the old file
destDir.DeleteEntry(destEntryId, true);
}
// Add the new file's entry
destEntryId = destDir.AddEntry(newEntry);
// Copy the contents...
using (Stream sourceStream = new FatFileStream(this, sourceDir, sourceEntryId, FileAccess.Read),
destStream = new FatFileStream(this, destDir, destEntryId, FileAccess.Write))
{
Utilities.PumpStreams(sourceStream, destStream);
}
}
private void PopulateNewChildDirectory(DirectoryEntry newEntry)
{
// Populate new directory with initial (special) entries. First one is easy, just change the name!
using (ClusterStream stream = new ClusterStream(_fileSystem, FileAccess.Write, newEntry.FirstCluster, uint.MaxValue))
{
// First is the self-referencing entry...
DirectoryEntry selfEntry = new DirectoryEntry(newEntry);
selfEntry.Name = FileName.SelfEntryName;
selfEntry.WriteTo(stream);
// Second is a clone of our self entry (i.e. parent) - though dates are odd...
DirectoryEntry parentEntry = new DirectoryEntry(SelfEntry);
parentEntry.Name = FileName.ParentEntryName;
parentEntry.CreationTime = newEntry.CreationTime;
parentEntry.LastWriteTime = newEntry.LastWriteTime;
parentEntry.WriteTo(stream);
}
}
internal void UpdateEntry(long id, DirectoryEntry entry)
{
if (id < 0)
{
throw new IOException("Attempt to update unknown directory entry");
}
_dirStream.Position = id;
entry.WriteTo(_dirStream);
_entries[id] = entry;
}
private void LoadEntries()
{
_entries = new Dictionary<long, DirectoryEntry>();
_freeEntries = new List<long>();
_selfEntryLocation = -1;
_parentEntryLocation = -1;
while (_dirStream.Position < _dirStream.Length)
{
long streamPos = _dirStream.Position;
DirectoryEntry entry = new DirectoryEntry(_fileSystem.FatOptions, _dirStream);
if (entry.Attributes == (FatAttributes.ReadOnly | FatAttributes.Hidden | FatAttributes.System | FatAttributes.VolumeId))
{
// Long File Name entry
}
else if (entry.Name.IsDeleted())
{
// E5 = Free Entry
_freeEntries.Add(streamPos);
}
else if (entry.Name == FileName.SelfEntryName)
{
_selfEntry = entry;
_selfEntryLocation = streamPos;
}
else if (entry.Name == FileName.ParentEntryName)
{
_parentEntry = entry;
_parentEntryLocation = streamPos;
}
else if (entry.Name == FileName.Null)
{
// Free Entry, no more entries available
_endOfEntries = streamPos;
break;
}
else
{
_entries.Add(streamPos, entry);
}
}
}
internal void DeleteEntry(long id, bool releaseContents)
{
if (id < 0)
{
throw new IOException("Attempt to delete unknown directory entry");
}
try
{
DirectoryEntry entry = _entries[id];
DirectoryEntry copy = new DirectoryEntry(entry);
copy.Name = entry.Name.Deleted();
_dirStream.Position = id;
copy.WriteTo(_dirStream);
if (releaseContents)
{
_fileSystem.Fat.FreeChain(entry.FirstCluster);
}
_entries.Remove(id);
_freeEntries.Add(id);
HandleAccessed(true);
}
finally
{
_fileSystem.Fat.Flush();
}
}
internal long AddEntry(DirectoryEntry newEntry)
{
// Unlink an entry from the free list (or add to the end of the existing directory)
long pos;
if (_freeEntries.Count > 0)
{
pos = _freeEntries[0];
_freeEntries.RemoveAt(0);
}
else
{
pos = _endOfEntries;
_endOfEntries += 32;
}
// Put the new entry into it's slot
_dirStream.Position = pos;
newEntry.WriteTo(_dirStream);
// Update internal structures to reflect new entry (as if read from disk)
_entries.Add(pos, newEntry);
HandleAccessed(true);
return pos;
}
internal SparseStream OpenFile(FileName name, FileMode mode, FileAccess fileAccess)
{
if (mode == FileMode.Append || mode == FileMode.Truncate)
{
throw new NotImplementedException();
}
long fileId = FindEntry(name);
bool exists = fileId != -1;
if (mode == FileMode.CreateNew && exists)
{
throw new IOException("File already exists");
}
else if (mode == FileMode.Open && !exists)
{
throw new FileNotFoundException("File not found", name.GetDisplayName(_fileSystem.FatOptions.FileNameEncoding));
}
else if ((mode == FileMode.Open || mode == FileMode.OpenOrCreate || mode == FileMode.Create) && exists)
{
SparseStream stream = new FatFileStream(_fileSystem, this, fileId, fileAccess);
if (mode == FileMode.Create)
{
stream.SetLength(0);
}
HandleAccessed(false);
return stream;
}
else if ((mode == FileMode.OpenOrCreate || mode == FileMode.CreateNew || mode == FileMode.Create) && !exists)
{
// Create new file
DirectoryEntry newEntry = new DirectoryEntry(_fileSystem.FatOptions, name, FatAttributes.Archive);
newEntry.FirstCluster = 0; // i.e. Zero-length
newEntry.CreationTime = _fileSystem.ConvertFromUtc(DateTime.UtcNow);
newEntry.LastWriteTime = newEntry.CreationTime;
fileId = AddEntry(newEntry);
return new FatFileStream(_fileSystem, this, fileId, fileAccess);
}
else
{
// Should never get here...
throw new NotImplementedException();
}
}
internal void AttachChildDirectory(FileName name, Directory newChild)
{
long id = FindEntry(name);
if (id >= 0)
{
throw new IOException("Directory entry already exists");
}
DirectoryEntry newEntry = new DirectoryEntry(newChild.ParentsChildEntry);
newEntry.Name = name;
AddEntry(newEntry);
DirectoryEntry newParentEntry = new DirectoryEntry(SelfEntry);
newParentEntry.Name = FileName.ParentEntryName;
newChild.ParentEntry = newParentEntry;
}
internal Directory CreateChildDirectory(FileName name)
{
long id = FindEntry(name);
if (id >= 0)
{
if ((_entries[id].Attributes & FatAttributes.Directory) == 0)
{
throw new IOException("A file exists with the same name");
}
else
{
return _fileSystem.GetDirectory(this, id);
}
}
else
{
try
{
uint firstCluster;
if (!_fileSystem.Fat.TryGetFreeCluster(out firstCluster))
{
throw new IOException("Failed to allocate first cluster for new directory");
}
_fileSystem.Fat.SetEndOfChain(firstCluster);
DirectoryEntry newEntry = new DirectoryEntry(_fileSystem.FatOptions, name, FatAttributes.Directory);
newEntry.FirstCluster = firstCluster;
newEntry.CreationTime = _fileSystem.ConvertFromUtc(DateTime.UtcNow);
newEntry.LastWriteTime = newEntry.CreationTime;
id = AddEntry(newEntry);
PopulateNewChildDirectory(newEntry);
// Rather than just creating a new instance, pull it through the fileSystem cache
// to ensure the cache model is preserved.
return _fileSystem.GetDirectory(this, id);
}
finally
{
_fileSystem.Fat.Flush();
}
}
}
