public static void AddItem(INode inode, String itemName, int itemINodeIndex)
{
var dir = new DirectoryBase(inode);
dir.Load();
dir.dir[itemName] = itemINodeIndex;
dir.Save();
}
public static INode AllocateNewINode(System.IO.FileAttributes attribute)
{
var index = GetFreeInodeIndex();
if (index != -1)
{
iNodes[index] = new INode(index, attribute);
return iNodes[index];
}
return null;
}
public static void DeleteItem(INode inode, String itemName)
{
var dir = new DirectoryBase(inode);
dir.Load();
if (!dir.Contains(itemName))
{
throw new System.IO.FileNotFoundException();
}
dir.dir.Remove(itemName);
dir.Save();
}
public static void RenameItem(INode inode, String itemOldName, String itemNewName)
{
var dir = new DirectoryBase(inode);
dir.Load();
if (!dir.Contains(itemOldName))
{
throw new System.IO.FileNotFoundException();
}
if (dir.Contains(itemNewName))
{
throw new System.IO.IOException();
}
var inodeIndex = dir.dir[itemOldName];
dir.dir.Remove(itemOldName);
dir.dir[itemNewName] = inodeIndex;
}
public static List<KeyValuePair<String, int>> ListItems(INode inode)
{
var dir = new DirectoryBase(inode);
dir.Load();
return dir.List();
}
/// <summary>
/// 将 inode 初始化为一个 Directory
/// </summary>
/// <param name="inode"></param>
public static void Initialize(INode inode)
{
var dir = new DirectoryBase(inode);
dir.Save();
}
public static int GetItem(INode inode, String itemName)
{
var dir = new DirectoryBase(inode);
dir.Load();
return dir.Find(itemName);
}
public static int Count(INode inode)
{
var dir = new DirectoryBase(inode);
dir.Load();
return dir.dir.Count;
}
public static Boolean Contains(INode inode, String name)
{
var dir = new DirectoryBase(inode);
dir.Load();
return dir.Contains(name);
}
public DirectoryBase(INode inode)
{
this.inode = inode;
dir = new Dictionary<string,int>();
}
public File(string path, System.IO.FileMode fileMode)
{
this.path = path;
var dir = new Directory(Util.GetPathDirectory(path));
var name = Util.GetPathFileName(path);
switch (fileMode)
{
case System.IO.FileMode.Append:
// 不支持
throw new NotImplementedException();
break;
case System.IO.FileMode.Create:
if (dir.Contains(name))
{
this.inode = Disk.iNodes[dir.GetItemINodeIndex(name)];
this.inode.SetEndOfFile(0);
}
else
{
this.inode = Disk.AllocateNewINode(System.IO.FileAttributes.Normal);
dir.AddItem(name, inode.index);
}
break;
case System.IO.FileMode.CreateNew:
//Console.WriteLine("*** CreateNew {0}", name);
if (dir.Contains(name))
{
throw new System.IO.IOException();
}
this.inode = Disk.AllocateNewINode(System.IO.FileAttributes.Normal);
dir.AddItem(name, inode.index);
break;
case System.IO.FileMode.Open:
//Console.WriteLine("*** Open {0}", name);
if (!dir.Contains(name))
{
throw new System.IO.FileNotFoundException();
}
this.inode = Disk.iNodes[dir.GetItemINodeIndex(name)];
break;
case System.IO.FileMode.OpenOrCreate:
if (!dir.Contains(name))
{
this.inode = Disk.AllocateNewINode(System.IO.FileAttributes.Normal);
dir.AddItem(name, inode.index);
}
else
{
this.inode = Disk.iNodes[dir.GetItemINodeIndex(name)];
}
break;
case System.IO.FileMode.Truncate:
if (!dir.Contains(name))
{
throw new System.IO.FileNotFoundException();
}
this.inode = Disk.iNodes[dir.GetItemINodeIndex(name)];
this.inode.SetEndOfFile(0);
break;
}
}
