/// <summary>
/// Sets the information that the vItem was changed. If SetLastAccess=true, the information that the vItem was accessed is also set.
/// </summary>
/// <param name="vItem"></param>
/// <param name="setLastAccess"></param>
public static void SetLastWrite(IFuserFilesystemItem vItem, bool setLastAccess)
{
try {
if (vItem == null)
{
return;
}
if (vItem.Filelock == null)
{
return;
}
FileLastAccessControl flac = vItem.Filelock.getLastAccessControl;
if (flac == null)
{
return;
}
lock (flac) {
flac.SetLastWrite();
if (setLastAccess)
{
flac.SetLastAccess();
}
}
} catch {
return;
}
}
/// <summary>
/// Converts a passed FileItem into a file information structure. Exceptions can be thrown.
/// </summary>
/// <param name="vItem"></param>
/// <returns></returns>
public static FuserFileInformation convertFileInformation(IFuserFilesystemItem vItem)
{
FuserFileInformation fileInfo = new FuserFileInformation();
convertFileInformation(vItem, fileInfo);
return(fileInfo);
}
private Win32Returncode pLastErrorCode; // always returns an error code that best fits.
public PathResolver(IFuserFilesystemDirectory root, string path)
{
this.pPath = null;
this.pFileitem = null;
this.pPathInvalid = true;
this.pLastErrorCode = Win32Returncode.DEFAULT_UNKNOWN_ERROR;
resolve(root, path);
}
/// <summary>
/// Sets the specified accesses and shares to the file. If false is returned, the lock cannot be set.
/// </summary>
/// <param name="fileHandle"></param>
/// <param name="item"></param>
/// <param name="access"></param>
/// <param name="share"></param>
/// <returns></returns>
public static bool FilelockSet(FileHandler fileHandle, IFuserFilesystemItem item, FuserFileAccess access, FileShare share)
{
FileLockItem lItem = null;
try {
lItem = new FileLockItem((item is IFuserFilesystemDirectory), (access == FuserFileAccess.Read || access == FuserFileAccess.ReadWrite), (access == FuserFileAccess.Write || access == FuserFileAccess.ReadWrite), share);
} catch {
return(false);
}
return(FilelockSet(fileHandle, item, lItem));
}
public void MoveTo(IFuserFilesystemItem item, IFuserFilesystemDirectory destination, string newname)
{
if (item is SimRoot)
{
throw new Exception("Access error");
}
if (item is SimFile)
{
SimFile vFile = (SimFile)item;
if (vFile.Name != newname)
{
vFile.SetNewName(newname);
}
}
if (item is SimSubdirectory)
{
SimSubdirectory vDir = (SimSubdirectory)item;
if (vDir.Name != newname)
{
vDir.SetNewName(newname);
}
}
if (destination == null)
{
return;
}
if (destination is SimSubdirectory)
{
SimSubdirectory vDstDir = (SimSubdirectory)destination;
directoryContent.Remove(item);
vDstDir.AddItem(item);
return;
}
if (destination is SimRoot)
{
SimRoot vDstRoot = (SimRoot)destination;
directoryContent.Remove(item);
vDstRoot.AddItem(item);
return;
}
throw new Exception("Mode not supported");
}
public void Delete(IFuserFilesystemItem item)
{
if (!directoryContent.Remove(item))
{
throw new Exception("File Not found");
}
else
{
if (item is SimFile)
{
SimFile vFile = (SimFile)item;
vFile.destroy();
}
}
}
public FileHandler(string filename)
{
this.pFilename = filename;
this.curItem = null;
this.curDir = null;
this.UseOPLocks = true;// by default, OPLocks must be checked
this.pIsOpenRead = false;
this.pIsOpenWrite = false;
this.pData = null;
this.pLocks = new List <FileLockItem>();
this.pLocks.Clear();
this.pFileLastAccess = new FileLastAccessControl();
}
/// <summary>
/// Converts a passed FileItem into a file information structure. Exceptions can be thrown.
/// </summary>
/// <param name="FuserFileItem"></param>
/// <returns></returns>
public static void convertFileInformation(IFuserFilesystemItem vItem, FuserFileInformation overwriteFileInfo)
{
lock (vItem) {
overwriteFileInfo.Filename = vItem.Name;
overwriteFileInfo.CreationTime = vItem.CreationTime;
overwriteFileInfo.LastAccessTime = vItem.LastAccessTime;
overwriteFileInfo.LastWriteTime = vItem.LastWriteTime;
overwriteFileInfo.Attributes = 0;
if (vItem.isArchive)
{
overwriteFileInfo.Attributes |= FileAttributes.Archive;
}
if (vItem.isReadOnly)
{
overwriteFileInfo.Attributes |= FileAttributes.ReadOnly;
}
if (vItem.isHidden)
{
overwriteFileInfo.Attributes |= FileAttributes.Hidden;
}
if (vItem.isSystem)
{
overwriteFileInfo.Attributes |= FileAttributes.System;
}
if (vItem is IFuserFilesystemDirectory)
{
overwriteFileInfo.Attributes |= FileAttributes.Directory;
overwriteFileInfo.Length = 0;
}
else
{
if (overwriteFileInfo.Attributes == 0)
{
overwriteFileInfo.Attributes = FileAttributes.Normal;
}
IFuserFilesystemFile file = (IFuserFilesystemFile)vItem;
overwriteFileInfo.Length = file.Length;
}
}
}
/// <summary>
/// Sets the specified FileLock on the file and saves it in the file handle. Returns whether the setting is successful;
/// if False is returned, the file is already blocked by another process.
/// </summary>
/// <param name="fileHandle"></param>
/// <param name="fsItem"></param>
/// <param name="LockItem"></param>
/// <returns></returns>
public static bool FilelockSet(FileHandler fileHandle, IFuserFilesystemItem fsItem, FileLockItem LockItem)
{
if (LockItem == null || fileHandle == null || fsItem == null)
{
return(false);
}
try {
bool ret = false;
FileLockManager lockMgr = fsItem.Filelock;
if (lockMgr == null)
{
return(false);
}
lock (lockMgr) {
ret = lockMgr.RegisterLock(LockItem);
}
if (ret && fsItem is IFuserFilesystemDirectory && LockItem.IsDirectory && !LockItem.IsOpLock && !LockItem.Share.HasFlag(FileShare.Delete))
{
RegisterBlockDeletePermission((IFuserFilesystemDirectory)fsItem, LockItem);
}
if (ret)
{
lock (fileHandle) {
fileHandle.AddFileLock(LockItem);
}
}
else
{
return(false); // access violation occurred
}
} catch {
return(false);
}
return(true);
}
/// <summary>
/// Release a filelock
/// </summary>
/// <param name="fileHandle"></param>
/// <param name="item"></param>
public static void FilelockRelease(FileHandler fileHandle, IFuserFilesystemItem item)
{
try {
if (fileHandle == null || item == null)
{
return;
}
FileLockManager lockMgr = item.Filelock;
FileLockItem[] locks = null;
lock (fileHandle) {
locks = fileHandle.GetFileLockList();
}
if (locks != null)
{
IFuserFilesystemDirectory dirItem = null;
if (item is IFuserFilesystemDirectory)
{
dirItem = (IFuserFilesystemDirectory)item;
}
lock (lockMgr) {
foreach (FileLockItem lItem in locks)
{
lockMgr.UnregisterLock(lItem);
if (dirItem != null)
{
ReleaseBlockDeletePermission(dirItem, lItem);
}
}
}
}
} catch {
return;
}
}
public bool DeletionAllow(IFuserFilesystemItem item)
{
return(true);
}
/// <summary>
/// Checks whether the specified area has been locked by another file handle.
/// </summary>
/// <param name="fileHandle"></param>
/// <param name="item"></param>
/// <param name="offset"></param>
/// <param name="length"></param>
/// <returns></returns>
public static bool FileOPLockCheck(FileHandler fileHandle, IFuserFilesystemItem item, long offset, long length)
{
try {
if (fileHandle == null)
{
return(false);
}
if (!fileHandle.OPLockActive)
{
return(true); // do not check any locks, according to the filehandle locks are not possible.
}
if (item == null)
{
return(false);
}
if (offset < 0)
{
return(true);
}
if (length <= 0)
{
return(true);
}
FileLockManager lockMgr = item.Filelock;
FileLockItem[] locksHandle = null; // list of locks from this handle.
FileLockItem[] locksFile = null; // list of locks from this file.
lock (fileHandle) {
locksHandle = fileHandle.GetFileLockList();
}
lock (lockMgr) {
locksFile = lockMgr.GetFileLockList();
}
if (locksFile == null)
{
return(true);
}
List <FileLockItem> locks = new List <FileLockItem>(locksFile);
if (locksHandle != null)
{
foreach (FileLockItem lItem in locksHandle)
{
locks.Remove(lItem);
}
}
foreach (FileLockItem lItem in locks)
{
if (lItem.IsOpLock)
{
if (!lItem.CheckOPLockRange(offset, length))
{
return(false);// violation occurred!
}
}
}
return(true);
} catch {
return(false);
}
}
public void AddItem(IFuserFilesystemItem n)
{
directoryContent.Add(n);
}
private void resolve(IFuserFilesystemDirectory root, string path)
{
FuserPathResolveResult vpr = null;
try {
vpr = ResolvePath(root, path);
this.pPath = vpr;
if (vpr.returncode != Win32Returncode.SUCCESS)
{
this.pPathInvalid = true;
this.pLastErrorCode = vpr.returncode;
return;
}
} catch {
// should never occur
this.pPathInvalid = true;
this.pLastErrorCode = Win32Returncode.ERROR_PATH_NOT_FOUND;
this.pPath = null;
return;
}
if (vpr != null)
{
if (vpr.HasError)
{
vpr = null;
}
}
if (vpr != null)
{
if (vpr.returncode != Win32Returncode.SUCCESS)
{
vpr = null;
}
}
if (vpr == null)
{
this.pPathInvalid = true;
this.pLastErrorCode = Win32Returncode.ERROR_PATH_NOT_FOUND;
this.pPath = null;
}
else
{
this.pPathInvalid = false;
this.pLastErrorCode = Win32Returncode.DEFAULT_UNKNOWN_ERROR;
this.pFileitem = null;
if (vpr.currentDirectory == root && vpr.itemname == "")
{
this.pFileitem = root;
}
else
{
if (vpr.itemname == "")
{
// path not found
this.pLastErrorCode = Win32Returncode.ERROR_PATH_NOT_FOUND;
this.pPathInvalid = true;
}
else
{
try {
lock (vpr.currentDirectory) {
this.pFileitem = vpr.currentDirectory.GetItem(vpr.itemname);
}
} catch {
this.pFileitem = null;
}
}
}
}
}
/// <summary>
/// Writes the LastAccessed and LastModified information, if they have been changed, to the file. For files, the archive attribute is also set if necessary.
/// </summary>
/// <param name="vItem"></param>
public static void WriteLastWriteAndAccess(IFuserFilesystemItem vItem)
{
try {
bool las = false;
bool lws = false;
bool IsDir = false;
DateTime lat = DateTime.MinValue;
DateTime lwt = DateTime.MinValue;
if (vItem == null)
{
return;
}
if (vItem.Filelock == null)
{
return;
}
IsDir = (vItem is IFuserFilesystemDirectory);
FileLastAccessControl flac = vItem.Filelock.getLastAccessControl;
if (flac == null)
{
return;
}
lock (flac) {
las = flac.IsLastAccessSet;
lws = flac.IsLastWriteSet;
if (las)
{
lat = flac.LastAccessTime;
}
if (lws)
{
lwt = flac.LastWriteTime;
}
if (las || lws)
{
flac.Rest(); // if there are any changes, reset them all.
}
}
if (!las && !lws)
{
return; // nothing to do
}
lock (vItem) {
if (las)
{
vItem.LastAccessTime = lat;
}
if (lws)
{
vItem.LastWriteTime = lwt;
if (!IsDir)
{
vItem.isArchive = true;
}
}
}
} catch {
return;
}
}
public void MoveTo(IFuserFilesystemItem item, IFuserFilesystemDirectory destination, string newname)
{
throw new NotImplementedException();
}
public void Delete(IFuserFilesystemItem item)
{
throw new NotImplementedException();
}
public void DebugAddEntry(IFuserFilesystemItem n)
{
throw new NotImplementedException();
}
/// <summary>
/// Checks whether the selected item can be deleted. Only the FileLocks are taken into account. Required for Move and Delete
/// </summary>
/// <param name="fileHandle"></param>
/// <param name="item"></param>
/// <returns></returns>
public static bool DeletionAllow(FileHandler fileHandle, IFuserFilesystemItem item)
{
try {
if (fileHandle == null)
{
return(false);
}
if (item == null)
{
return(false);
}
List <FileLockItem> locks;
FileLockManager lockMgr = item.Filelock;
FileLockItem[] locksHandle = null; // list with locks for the current fileHandle
FileLockItem[] locksFile = null; // list with locks for the current file
FileLockItem[] locksBlockDelete = null; // list with deletion-locks for the current file
lock (fileHandle) {
locksHandle = fileHandle.GetFileLockList();
}
lock (lockMgr) {
locksFile = lockMgr.GetFileLockList();
locksBlockDelete = lockMgr.GetBlockDeletePermissionList();
}
if (locksFile == null)
{
return(true); // no locks found, file not in use
}
// check: deletion block
if (locksBlockDelete != null)
{
locks = new List <FileLockItem>(locksBlockDelete);
if (locksHandle != null)
{
foreach (FileLockItem lItem in locksHandle)
{
locks.Remove(lItem);
}
}
if (locks.Count != 0)
{
return(false);// deletion was blocked
}
}
// check: deletion block
locks = new List <FileLockItem>(locksFile);
if (locksHandle != null)
{
foreach (FileLockItem lItem in locksHandle)
{
locks.Remove(lItem);
}
}
bool del = false;
foreach (FileLockItem lck in locks)
{
if (!lck.Share.HasFlag(FileShare.Delete))
{
del = true;
}
}
if (del == false)
{
return(true);
}
else
{
return(false);
}
} catch {
return(false);
}
}
