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 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 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;
}
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;
}
