public bool RemoveFile(Inode parentDirInode, string name)
{
Directory parentDir = ReadDirectory(parentDirInode);
if (!parentDir.Сontent.ContainsKey(name))
{
return(false);
}
Inode inode = ReadInode(parentDir.Сontent[name]);
if (inode.Type != 1 || inode.System)
{
return(false);
}
List <uint> addrFile = ReadFile(inode.FirstDataBlockNum);
foreach (uint addr in addrFile)
{
DeleteDataBlock(addr);
}
DeleteInode(inode);
parentDir.Сontent.Remove(name);
parentDirInode.ModifyDate = DateConverter.ToInt32(DateTime.Now);
WriteChanges(parentDirInode);
WriteChanges(parentDir, parentDirInode.FirstDataBlockNum);
return(true);
}
private uint CopyDirectory(Inode srcInode, Inode dstParentDirInode, string name)
{
Directory srcDir = ReadDirectory(srcInode);
Directory dstParentDir = ReadDirectory(dstParentDirInode);
if (dstParentDir.Сontent.ContainsKey(name))
{
return(0);
}
Inode i = ReadInode(CreateDirectory(dstParentDirInode, name));
foreach (KeyValuePair <string, uint> entry in srcDir.Сontent)
{
Inode curr = ReadInode(entry.Value);
if (curr.Type == 1)
{
CopyFile(curr, i, entry.Key);
}
if (curr.Type == 2)
{
CopyDirectory(curr, i, entry.Key);
}
}
return(0);
}
public uint CreateDirectory(Inode parentInode, string name)//возвращает адрес инода
{
Directory parentDir = ReadDirectory(parentInode);
if (!parentInode.isCanWrite(currUserId, currGroupId) || parentInode.Type != 2 || name.Length == 0 ||
parentDir.Сontent.ContainsKey(name) || Sb.Dfree == 0 || Sb.Ifree == 0 || parentInode.ReadOnly)
{
return(0);
}
uint newInodeNum = InodeBitmap.SeekFree();
Inode newInode = new Inode(2, newInodeNum, currUserId, currGroupId, BlockBitmap.SeekFree());
InodeBitmap[newInodeNum] = true;
BlockBitmap[BlockBitmap.SeekFree()] = true;
Sb.Ifree--;
Sb.Dfree--;
Directory newDir = new Directory(parentInode.InodeId, newInodeNum);
parentDir.Сontent.Add(name, newInode.InodeId);
parentInode.ModifyDate = DateConverter.ToInt32(DateTime.Now);
WriteChanges(parentInode);
WriteChanges(parentDir, parentInode.InodeId);
WriteChanges(newInode);
WriteChanges(newDir, newInode.FirstDataBlockNum);
return(newInode.InodeId);
}
private void DeleteInode(Inode inode)
{
inode.Type = 0;
InodeBitmap[inode.InodeId] = false;
Sb.Ifree++;
WriteChanges(inode);
}
public static void ChangeDir(string[] args)
{
if (args.Length != 1)
{
Console.WriteLine("Wrong syntax");
return;
}
Inode newInode = fs.ReadInode(getLastInode(args[0]));
if (newInode.Type == 2 || newInode.isCanRead(fs.currUserId, fs.currGroupId))
{
CurrDirectoryInode = newInode.InodeId;
if (CurrDirectoryInode == 1)
{
Path = "/";
return;
}
switch (args[0])
{
case ".": break;
case "..":
Inode i = fs.ReadInode(getLastInode(args[0]));
Path = fs.ReadDirectory(i).Сontent.FirstOrDefault(x => x.Value == CurrDirectoryInode).Key;
break;
default: Path = args[0].Split('/').Last(); break;
}
}
}
public bool ChangeMode(uint inodeNum, int rwx)
{
Inode inode = ReadInode(inodeNum);
if (inode.Type == 0 || !inode.isCanWrite(currUserId, currGroupId))
{
return(false);
}
inode.Chmod(rwx);
WriteChanges(inode);
return(true);
}
private uint CopyFile(Inode srcInode, Inode dstParentDirInode, string name)
{
Directory dstParent = ReadDirectory(dstParentDirInode);
if (!dstParentDirInode.isCanWrite(currUserId, currGroupId) || dstParent.Сontent.ContainsKey(name))
{
return(0);
}
uint newInodeNum = CreateFile(dstParentDirInode, name);
WriteFile(ReadInode(newInodeNum), OpenFile(srcInode.InodeId));
return(newInodeNum);
}
public uint Copy(Inode srcInode, Inode dstParentDirInode, string name)
{
if (dstParentDirInode.Type != 2)
{
return(0);
}
switch (srcInode.Type)
{
case 1: return(CopyFile(srcInode, dstParentDirInode, name));
case 2: return(CopyDirectory(srcInode, dstParentDirInode, name));
default: return(0);
}
}
public string OpenFile(uint inodeNum)
{
string data = "";
Inode inode = ReadInode(inodeNum);
if (!inode.isCanRead(currUserId, currGroupId))
{
return("Cannot read file due to insufficient permissions");
}
List <uint> fileAddr = ReadFile(inode.FirstDataBlockNum);
foreach (uint addr in fileAddr)
{
data += Encoding.GetEncoding(1251).GetString(ReadBytes(2044, (int)(Sb.Ssize * Sb.DataBlocksAddr() + Sb.Ssize * addr + 4))).Split('\0')[0];
}
return(data);
}
public Directory ReadDirectory(Inode inode)
{
Directory dir = new Directory();
if (inode.Type != 2)
{
return(dir);
}
uint nextDataBlockNum = inode.FirstDataBlockNum;
while (nextDataBlockNum != 0)
{
byte[] data = ReadBytes((int)Sb.Ssize, (int)(Sb.DataBlocksAddr() * Sb.Ssize + inode.FirstDataBlockNum * Sb.Ssize));
dir.Set(data);
byte[] tempDataBlockNum = new byte[4];
Array.Copy(data, tempDataBlockNum, 4);
nextDataBlockNum = BitConverter.ToUInt32(tempDataBlockNum, 0);
}
return(dir);
}
public string[] getAllInfo(uint inodeNum)
{
string[] data = new string[5];
int i = 0;
Inode inode = ReadInode(inodeNum);
data[i++] += inode.GetFilePermissions();
data[i++] += inode.UserId; //todo выводить имя а не ид
data[i++] += inode.GroupId; //todo
if (inode.Type == 2)
{
data[i++] += "2048Б ";
}
if (inode.Type == 1)
{
data[i++] += (ReadFile(inode.FirstDataBlockNum).Count * 2048) + "Б";
}
data[i++] += DateConverter.ToDateTime(inode.ModifyDate);
return(data);
}
public uint WriteFile(Inode inode, string data) //перезаписывает файл целиком //возвращает успешность
{
if (!inode.isCanWrite(currUserId, currGroupId) || inode.Type != 1 || inode.ReadOnly)
{
return(0);
}
List <uint> fileAddr = ReadFile(inode.FirstDataBlockNum);
if ((data.Length - fileAddr.Count * 2044) / 2044 > Sb.Dfree) //нет свободных блоков данных
{
return(0);
}
//пометить не исопльзуемые блоки данных как пустые
for (int i = data.Length / 2045; i < fileAddr.Count - 1; i++)
{
BlockBitmap[(uint)(fileAddr.Count - 1)] = false;
Sb.Dfree++;
}
//выделение новых блоков данных
for (int i = fileAddr.Count - 1; i < data.Length / 2045; i++)
{
uint nextAddr = BlockBitmap.SeekFree();
BlockBitmap[nextAddr] = true;
Sb.Dfree--;
fileAddr.Add(nextAddr);
}
for (int i = 0; i < fileAddr.Count; i++)
{
byte[] b = new byte[2048];
Array.Copy(BitConverter.GetBytes(i == fileAddr.Count - 1 ? 0 : fileAddr[i + 1]), 0, b, 0, 4);
string subStr = data.Substring(i * 2044, data.Length - 2044 * i > 2044 ? 2044 : data.Length - 2044 * i);
Array.Copy(Encoding.GetEncoding(1251).GetBytes(subStr), 0, b, 4, subStr.Length);
WriteBytes(b, (int)(Sb.Ssize * Sb.DataBlocksAddr() + Sb.Ssize * fileAddr[i]));
}
inode.ModifyDate = DateConverter.ToInt32(DateTime.Now);
WriteChanges(inode);
WriteChanges();
return(1);
}
public bool RemoveDirectory(Inode parentInode, string name)
{
Directory parentDir = ReadDirectory(parentInode);
if (!parentDir.Сontent.ContainsKey(name))
{
return(false);
}
Inode inode = ReadInode(parentDir.Сontent[name]);
Directory dir = ReadDirectory(inode);
foreach (KeyValuePair <string, uint> entry in dir.Сontent)
{
if (entry.Key == "." || entry.Key == "..")
{
continue;
}
Inode i = ReadInode(entry.Value);
if (i.Type == 2)
{
RemoveDirectory(inode, entry.Key);
}
else
{
RemoveFile(inode, entry.Key);
}
}
DeleteDataBlock(inode.FirstDataBlockNum);
DeleteInode(inode);
//здесь должны быть мемы с >63, но их нет
parentDir.Сontent.Remove(name);
parentInode.ModifyDate = DateConverter.ToInt32(DateTime.Now);
WriteChanges(parentInode);
WriteChanges(parentDir, parentInode.InodeId);
WriteChanges(dir, inode.FirstDataBlockNum);
return(true);
}
public void WriteChanges(Inode inode)
{
WriteChanges();
WriteBytes(inode.ToBytes(), (int)(Sb.InodeAddr() * Sb.Ssize + inode.InodeId * Inode.Size));
}