public void removeFile(string name, inode n, int index)
{
inode _node = null;
if (n == null)
{
_node = node[workDir];
listView.Items.RemoveAt(index);
}
else
{
_node = n;
}
int id = datablock[_node.getBlock(0)].removeInode(name); //找到删除文件的inode
_node = node[id];
for (int i = 0;; i++) //释放inodetable中信息
{
string _name = datablock[_node.getBlock(0)].findInode(0);
if (_name != null)
{
removeFile(_name, node[id], -1);
}
else
{
break;
}
}
List <int> b = _node.getBlockPtr().ToList <int>(); //获得该节点占用的全部块
blockMap.release(b); //释放块位图
nodeMap.release(id); //释放节点位图
IOFormatter.getInstance().Serialize(IOStream.getInstance(), datablock);
}
public void reNameFile(string newName, int _index) //重命名文件
{
inode _node = node[workDir];
datablock[_node.getBlock(0)].reNameInode(newName, _index); //在父目录的inodetable中进行修改
IOFormatter.getInstance().Serialize(IOStream.getInstance(), datablock);
}
private void boot()
{
Stream stream = new FileStream("block.dat", FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.ReadWrite);
if (0 == stream.Length)
{
superBlock superblock = new superBlock(1024, 4096);
dataBlock block = new dataBlock();
block.data = superblock;
datablock[0] = block;
initBoot();
((blockBitmap)datablock[2].data).findUnuse(1);
}
inode root = new inode();
List <int> b = new List <int>();
b.Add(4);
root.init(0, b, "文件夹", DateTime.Now);
((inode[])datablock[3].data)[0] = root;
dataBlock data = new dataBlock();
((blockBitmap)datablock[2].data).findUnuse(4);
List <int> nodes = ((inodeBitmap)datablock[1].data).findUnuse(1);
datablock[4] = new dataBlock();
datablock[4].createInode("..", -1);
datablock[4].createInode(".", nodes[0]);
IOFormatter.getInstance().Serialize(IOStream.getInstance(), datablock);
}
public Boolean saveFile(string content)
{
int num = node[selectedFile].getBlockNum(); //获取文件已有磁盘块数目
byte[] buffer = Encoding.Default.GetBytes(content);
int n = buffer.Length / 100; //计算所需磁盘块
int offset = buffer.Length % 100;
if (n > 13)
{
return(false);
}
List <int> mem;
if (offset > 0)
{
mem = blockMap.findUnuse(n + 1 - num);
}
else
{
mem = blockMap.findUnuse(n - num);
}
if (mem == null && n - num > 0) //需要新块但找不到空的磁盘块
{
return(false);
}
for (int i = 0; i <= n; i++)
{
string con;
if (i < n)
{
con = Encoding.Default.GetString(buffer, 100 * i, 100);
}
else
{
con = Encoding.Default.GetString(buffer, 100 * i, offset);
}
if (node[selectedFile].getBlock(i) == 0)
{
if (datablock[mem[0]] == null)
{
datablock[mem[0]] = new dataBlock();
}
node[selectedFile].setBlock(mem[0], i); //为文件分配新的磁盘块
datablock[mem[0]].data = con; //存储信息
mem.RemoveAt(0);
}
else
{
datablock[node[selectedFile].getBlock(i)].data = con;
}
}
node[selectedFile].setTime(DateTime.Now);
IOFormatter.getInstance().Serialize(IOStream.getInstance(), datablock);
listItems(workDir);
return(true);
}
private dataBlock[] datablock = new dataBlock[4096]; //模拟磁盘块的数组
private MemoryInterface()
{
if (0 == IOStream.getInstance().Length)
{
boot();
}
datablock = (dataBlock[])IOFormatter.getInstance().Deserialize(IOStream.getInstance());
}
public MemoryManage(ListView listView)
{
this.listView = listView;
if (0 == IOStream.getInstance().Length)
{
initBoot();
}
datablock = (dataBlock[])IOFormatter.getInstance().Deserialize(IOStream.getInstance());
node = (inode[])datablock[3].data;
blockMap = (blockBitmap)datablock[2].data;
nodeMap = (inodeBitmap)datablock[1].data;
listItems(workDir);
}
public Boolean createEntry(string type, string _name) //创建新的文件
{
int parent = -1;
inode _node = null;
if (_name != null) //点击文件夹创建
{
parent = datablock[node[workDir].getBlock(0)].findInode(_name); //选中文件夹为父目录
}
else //直接新建
{
parent = workDir; //当前目录为父目录
}
_node = node[parent];
List <int> nodeLoc = nodeMap.findUnuse(1); //找到未使用的inode节点
List <int> blockLoc = blockMap.findUnuse(1); //找到空闲磁盘块
if (nodeLoc == null || blockLoc == null) //inodeMap或blockMap用尽
{
return(false);
}
if (datablock[blockLoc[0]] == null) //磁盘块未初始化
{
datablock[blockLoc[0]] = new dataBlock();
if (type == "文件夹")
{
initDir(blockLoc[0], parent, nodeLoc[0]);
}
}
if (node[nodeLoc[0]] == null) //inode为初始化
{
node[nodeLoc[0]] = new inode();
}
string name = "新建" + type;
name = datablock[_node.getBlock(0)].createInode(name, nodeLoc[0]);
if (_name == null)
{
setViewItem(name, type, 0, DateTime.Now);
}
node[nodeLoc[0]].init(nodeLoc[0], blockLoc, type, DateTime.Now);
IOFormatter.getInstance().Serialize(IOStream.getInstance(), datablock);
return(true);
}
private void initBoot()
{
Stream stream = new FileStream("super.dat", FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.ReadWrite);
if (0 == stream.Length)
{
superBlock superblock = new superBlock(1024, 4096);
dataBlock boot = new dataBlock();
boot.data = superblock;
datablock = new dataBlock[4096];
node = new inode[1024];
blockMap.findUnuse(1);
datablock[0] = boot;
}
inode root = new inode();
List <int> b = new List <int>();
b.Add(4);
root.init(0, b, "文件夹", DateTime.Now);
node[0] = root;
dataBlock data = new dataBlock();
blockMap.findUnuse(4);
List <int> nodes = nodeMap.findUnuse(1);
datablock[1] = new dataBlock();
datablock[1].data = nodeMap;
datablock[2] = new dataBlock();
datablock[2].data = blockMap;
datablock[3] = new dataBlock();
datablock[3].data = node;
datablock[4] = new dataBlock();
initDir(4, -1, nodes[0]);
IOFormatter.getInstance().Serialize(IOStream.getInstance(), datablock);
}
public void write()
{
IOFormatter.getInstance().Serialize(IOStream.getInstance(), datablock);
}
