public static void SetAttributes(string path, FileAttributes fileAttributes)
{
// path validation in Path.GetFullPath()
var fullPath = Path.GetFullPath(path);
DriveInfo.GetForPath(fullPath).SetAttributes(fullPath, fileAttributes);
}
private const int _defaultCopyBufferSize = 2048; /// Experiment on desktop shows 2k-4k is ideal size perfwise.
internal static void Copy(string sourceFileName, string destFileName, bool overwrite, bool deleteOriginal)
{
// sourceFileName and destFileName validation in Path.GetFullPath()
sourceFileName = Path.GetFullPath(sourceFileName);
destFileName = Path.GetFullPath(destFileName);
var writerMode = (overwrite) ? FileMode.Create : FileMode.CreateNew;
var reader = new FileStream(sourceFileName, FileMode.Open, FileAccess.Read, FileShare.Read, FileStream.BufferSizeDefault);
try
{
using (var writer = new FileStream(destFileName, writerMode, FileAccess.Write, FileShare.None, FileStream.BufferSizeDefault))
{
var fileLength = reader.Length;
writer.SetLength(fileLength);
var buffer = new byte[_defaultCopyBufferSize];
for (; ;)
{
var readSize = reader.Read(buffer, 0, _defaultCopyBufferSize);
if (readSize <= 0)
{
break;
}
writer.Write(buffer, 0, readSize);
}
// Copy the attributes too
DriveInfo.GetForPath(destFileName).SetAttributes(destFileName, DriveInfo.GetForPath(sourceFileName).GetAttributes(sourceFileName));
}
}
finally
{
if (deleteOriginal)
{
reader.DisposeAndDelete();
}
else
{
reader.Dispose();
}
}
}
// Deletes a file. The file specified by the designated path is deleted.
// If the file does not exist, Delete succeeds without throwing
// an exception.
//
// On NT, Delete will fail for a file that is open for normal I/O
// or a file that is memory mapped. On Win95, the file will be
// deleted irregardless of whether the file is being used.
//
// Your application must have Delete permission to the target file.
//
public static void Delete(string path)
{
// path validation in Path.GetFullPath()
path = Path.GetFullPath(path);
var folderPath = Path.GetDirectoryName(path);
// We have to make sure no one else has the file opened, and no one else can modify it when we're deleting
var record = FileSystemManager.AddToOpenList(path);
try
{
var attributes = DriveInfo.GetForPath(path).GetAttributes(folderPath);
/// If the folder does not exist or invalid we throw DirNotFound Exception (same as desktop).
if ((uint)attributes == 0xFFFFFFFF)
{
throw new IOException("", (int)IOException.IOExceptionErrorCode.DirectoryNotFound);
}
/// Folder exists, lets verify whether the file itself exists.
attributes = DriveInfo.GetForPath(path).GetAttributes(path);
if ((uint)attributes == 0xFFFFFFFF)
{
// No-op on file not found
return;
}
if ((attributes & (FileAttributes.Directory | FileAttributes.ReadOnly)) != 0)
{
/// it's a readonly file or an directory
throw new IOException("", (int)IOException.IOExceptionErrorCode.UnauthorizedAccess);
}
DriveInfo.GetForPath(path).Delete(path);
}
finally
{
// regardless of what happened, we need to release the file when we're done
FileSystemManager.RemoveFromOpenList(record);
}
}
public static FileAttributes GetAttributes(string path)
{
// path validation in Path.GetFullPath()
var fullPath = Path.GetFullPath(path);
var attributes = DriveInfo.GetForPath(fullPath).GetAttributes(fullPath);
if ((uint)attributes == 0xFFFFFFFF)
{
throw new IOException("", (int)IOException.IOExceptionErrorCode.FileNotFound);
}
else if (attributes == 0x0)
{
return(FileAttributes.Normal);
}
else
{
return((FileAttributes)attributes);
}
}
// Tests if a file exists. The result is true if the file
// given by the specified path exists; otherwise, the result is
// false. Note that if path describes a directory,
// Exists will return true.
//
// Your application must have Read permission for the target directory.
//
public static bool Exists(string path)
{
try
{
// path validation in Path.GetFullPath()
path = Path.GetFullPath(path);
/// Is this the absolute root? this is not a file.
var root = Path.GetPathRoot(path);
if (string.Equals(root, path))
{
return(false);
}
else
{
var attributes = DriveInfo.GetForPath(path).GetAttributes(path);
/// This is essentially file not found.
if ((uint)attributes == 0xFFFFFFFF)
{
return(false);
}
if ((attributes & FileAttributes.Directory) == 0)
{
/// Not a directory, it must be a file.
return(true);
}
}
}
catch (Exception)
{
/// Like desktop, exists here does not throw exception in
/// a number of cases, instead returns false. For more
/// details see MSDN.
}
return(false);
}
// Moves a specified file to a new location and potentially a new file name.
// This method does work across volumes.
//
// The caller must have certain FileIOPermissions. The caller must
// have Read and Write permission to
// sourceFileName and Write
// permissions to destFileName.
//
public static void Move(string sourceFileName, string destFileName)
{
if (Path.GetPathRoot(sourceFileName) != Path.GetPathRoot(destFileName))
{
throw new ArgumentException();
}
// sourceFileName and destFileName validation in Path.GetFullPath()
sourceFileName = Path.GetFullPath(sourceFileName);
destFileName = Path.GetFullPath(destFileName);
var tryCopyAndDelete = false;
// We only need to lock the source, not the dest because if dest is taken
// Move() will failed at the driver's level anyway. (there will be no conflict even if
// another thread is creating dest, as only one of the operations will succeed --
// the native calls are atomic)
var srcRecord = FileSystemManager.AddToOpenList(sourceFileName);
try
{
if (!Exists(sourceFileName))
{
throw new IOException("", (int)IOException.IOExceptionErrorCode.FileNotFound);
}
//We'll try copy and deleting if Move returns false
tryCopyAndDelete = !DriveInfo.GetForPath(sourceFileName).Move(sourceFileName, destFileName);
}
finally
{
FileSystemManager.RemoveFromOpenList(srcRecord);
}
if (tryCopyAndDelete)
{
Copy(sourceFileName, destFileName, false, true);
}
}
