/// <summary>
/// serializes a directory item entry.
/// </summary>
/// <param name="item">the item to be serialized.</param>
/// <param name="dataWriter">the stream the item should be serialized to.</param>
private static void SerializeItem(VirtualItem item, DataWriter dataWriter)
{
dataWriter.WriteUInt32(item.FileNumber);
dataWriter.WriteByte((byte) (item is VirtualDirectory ? ItemType.Directory : ItemType.File));
dataWriter.WriteString(item.Name);
}
/// <summary>
/// removes an item entry from this directory.
/// </summary>
/// <param name="itemToRemove">the item to remove.</param>
internal void RemoveItem(VirtualItem itemToRemove)
{
IEnumerable<VirtualItem> items = ReadAllItems();
var dataWriter = new DataWriter();
foreach (VirtualItem remainingItem in items.Where(item => item.FileNumber != itemToRemove.FileNumber))
{
SerializeItem(remainingItem, dataWriter);
}
FileStream stream = GetFileStream();
byte[] data = dataWriter.GetData();
stream.Write(BitConverter.GetBytes((ulong) data.Length));
stream.Write(data);
}
internal void RenameItem(VirtualItem virtualItem, string newName)
{
var dataWriter = new DataWriter();
foreach (VirtualItem item in ReadAllItems())
{
if (item.FileNumber == virtualItem.FileNumber)
{
item.Name = newName;
}
SerializeItem(item, dataWriter);
}
FileStream stream = GetFileStream();
byte[] data = dataWriter.GetData();
if (stream.Length < data.Length + 8)
{
ContainerFile.ChangeFileSize(FileNumber, (uint) (data.Length + 8));
}
stream = GetFileStream();
stream.Write(BitConverter.GetBytes((ulong) data.Length));
stream.Write(data);
}
/// <summary>
/// adds an item to this directory.
/// </summary>
/// <param name="itemToAdd">the item to add.</param>
internal void AddItem(VirtualItem itemToAdd)
{
FileStream fileStream = GetFileStream();
long currentSize = BitConverter.ToInt64(fileStream.Read(8), 0);
var dataWriter = new DataWriter();
SerializeItem(itemToAdd, dataWriter);
byte[] data = dataWriter.GetData();
long newSize = currentSize + data.Length;
if (fileStream.Length < newSize + 8)
{
ContainerFile.ChangeFileSize(FileNumber, (uint) (newSize + 8));
}
fileStream = GetFileStream();
fileStream.Write(BitConverter.GetBytes(newSize));
fileStream.Seek(currentSize + 8, SeekOrigin.Begin);
fileStream.Write(data);
}