internal static SafeFileHandle CreateFile(
string path,
FileAccess fileAccess,
FileShare fileShare,
FileMode creationDisposition,
AllFileAttributeFlags flagsAndAttributes)
{
path = Paths.AddExtendedPrefix(path);
if (creationDisposition == FileMode.Append)
{
creationDisposition = FileMode.OpenOrCreate;
}
uint dwDesiredAccess =
((fileAccess & FileAccess.Read) != 0 ? Private.GENERIC_READ : 0) |
((fileAccess & FileAccess.Write) != 0 ? Private.GENERIC_WRITE : 0);
SafeFileHandle handle = Private.CreateFileW(path, dwDesiredAccess, fileShare, IntPtr.Zero, creationDisposition, flagsAndAttributes, IntPtr.Zero);
if (handle.IsInvalid)
{
int error = Marshal.GetLastWin32Error();
throw GetIoExceptionForError(error, path);
}
return(handle);
}
internal static extern SafeFileHandle CreateFileW(
string lpFileName,
uint dwDesiredAccess,
[MarshalAs(UnmanagedType.U4)] FileShare dwShareMode,
IntPtr lpSecurityAttributes,
[MarshalAs(UnmanagedType.U4)] FileMode dwCreationDisposition,
AllFileAttributeFlags dwFlagsAndAttributes,
IntPtr hTemplateFile);
internal static string GetFinalPathName(string path, FinalPathFlags finalPathFlags, bool resolveLinks)
{
if (path == null)
{
return(null);
}
string lookupPath = Paths.AddExtendedPrefix(path);
// BackupSemantics is needed to get directory handles
AllFileAttributeFlags createFileFlags = AllFileAttributeFlags.FILE_ATTRIBUTE_NORMAL | AllFileAttributeFlags.FILE_FLAG_BACKUP_SEMANTICS;
if (!resolveLinks)
{
createFileFlags |= AllFileAttributeFlags.FILE_FLAG_OPEN_REPARSE_POINT;
}
string finalPath = null;
using (SafeFileHandle file = CreateFile(
lookupPath,
// To look at metadata we don't need read or write access
0,
FileShare.ReadWrite,
FileMode.Open,
createFileFlags))
{
if (file.IsInvalid)
{
int error = Marshal.GetLastWin32Error();
throw GetIoExceptionForError(error, path);
}
finalPath = NativeMethods.BufferInvoke((buffer) => Private.GetFinalPathNameByHandleW(file, buffer, (uint)buffer.CharCapacity, finalPathFlags), path);
}
// GetFinalPathNameByHandle will use the legacy drive for the volume (e.g. \\?\C:\). We may have started with \\?\Volume({GUID}) or some
// other volume name format (C:\, etc.) we want to put it back.
return(Paths.ReplaceRoot(path, finalPath));
}
internal static extern SafeFileHandle CreateFileW(
string lpFileName,
uint dwDesiredAccess,
[MarshalAs(UnmanagedType.U4)] FileShare dwShareMode,
IntPtr lpSecurityAttributes,
[MarshalAs(UnmanagedType.U4)] FileMode dwCreationDisposition,
AllFileAttributeFlags dwFlagsAndAttributes,
IntPtr hTemplateFile);
internal static SafeFileHandle CreateFile(
string path,
FileAccess fileAccess,
FileShare fileShare,
FileMode creationDisposition,
AllFileAttributeFlags flagsAndAttributes)
{
path = Paths.AddExtendedPrefix(path);
if (creationDisposition == FileMode.Append) creationDisposition = FileMode.OpenOrCreate;
uint dwDesiredAccess =
((fileAccess & FileAccess.Read) != 0 ? Private.GENERIC_READ : 0) |
((fileAccess & FileAccess.Write) != 0 ? Private.GENERIC_WRITE : 0);
SafeFileHandle handle = Private.CreateFileW(path, dwDesiredAccess, fileShare, IntPtr.Zero, creationDisposition, flagsAndAttributes, IntPtr.Zero);
if (handle.IsInvalid)
{
int error = Marshal.GetLastWin32Error();
throw GetIoExceptionForError(error, path);
}
return handle;
}
private static extern SafeFileHandle CreateFilePrivate(
string fileName,
[MarshalAs(UnmanagedType.U4)] FileAccess fileAccess,
[MarshalAs(UnmanagedType.U4)] FileShare fileShare,
IntPtr securityAttributes,
[MarshalAs(UnmanagedType.U4)] FileMode creationDisposition,
AllFileAttributeFlags flagsAndAttributes,
IntPtr template);
internal static SafeFileHandle CreateFile(
string path,
FileAccess fileAccess,
FileShare fileShare,
FileMode creationDisposition,
AllFileAttributeFlags flagsAndAttributes)
{
path = Paths.AddExtendedPathPrefix(path);
if (creationDisposition == FileMode.Append) creationDisposition = FileMode.OpenOrCreate;
SafeFileHandle handle = CreateFilePrivate(path, fileAccess, fileShare, IntPtr.Zero, creationDisposition, flagsAndAttributes, IntPtr.Zero);
if (handle.IsInvalid)
{
int error = Marshal.GetLastWin32Error();
throw GetIoExceptionForError(error, path);
}
return handle;
}