private int FindEmptyItem(int startIndex)
{
startIndex++;
var emptyEntryIndex = default(int?);
var maxCapacity = index.SizeInBlocks * index.BlockSize;
if (maxCapacity > startIndex)
{
var buffer = new DirectoryItem[maxCapacity - startIndex];
blockStream.Read(startIndex, buffer);
emptyEntryIndex = buffer
.Where(x => x.Entry.Flags == DirectoryFlags.None || (x.Entry.Flags & DirectoryFlags.Deleted) != 0)
.Select((x, entryIndex) => (int?)entryIndex)
.FirstOrDefault();
}
if (emptyEntryIndex == null)
{
index.SetSizeInBlocks(index.SizeInBlocks + 1);
return(startIndex);
}
return(startIndex + emptyEntryIndex.Value);
}
public IDirectoryEntryInfo[] GetDirectoryEntries()
{
indexLock.EnterReadLock();
try
{
var result = new List <IDirectoryEntryInfo>(itemsCount);
if (itemsCount > 0)
{
var buffer = new DirectoryItem[itemsCount];
blockStream.Read(1, buffer);
var names = new short[lastNameOffset];
nameIndexBlockStream.Read(0, names);
foreach (var item in buffer.Where(x => (x.Entry.Flags & DirectoryFlags.Deleted) == 0))
{
var entry = item.Entry;
var nameLength = names[entry.NameOffset];
var nameBuffer = new char[nameLength];
for (var i = 0; i < nameLength; i++)
{
nameBuffer[i] = (char)names[entry.NameOffset + 1 + i];
}
result.Add(new DirectoryEntryInfo(entry, new string(nameBuffer)));
}
}
return(result.ToArray());
}
finally
{
indexLock.ExitReadLock();
}
}