private static NativeMethods.RemoteNameInfo GetMappedInfoInternal(string path)
{
if (path == null)
{
throw new ArgumentNullException("path", "The specified path cannot be NULL.");
}
if (IsLongPath(path))
{
throw new ArgumentException("Long paths are not supported but this method.");
}
if (path.Length > NativeMethods.MAX_PATH)
{
throw new System.IO.PathTooLongException();
}
int bufferSize = 0;
SafeGlobalMemoryBufferHandle safeBuffer = new SafeGlobalMemoryBufferHandle(bufferSize);
try
{
uint retVal;
// first call is to get correct buffer size to store results.
if ((retVal = NativeMethods.WNetGetUniversalName(path, NativeMethods.REMOTE_NAME_INFO_LEVEL, safeBuffer, ref bufferSize)) != Win32Errors.ERROR_MORE_DATA)
{
NativeError.ThrowException(retVal);
}
safeBuffer.Dispose();
safeBuffer = null;
safeBuffer = new SafeGlobalMemoryBufferHandle(bufferSize);
if ((retVal = NativeMethods.WNetGetUniversalName(path, NativeMethods.REMOTE_NAME_INFO_LEVEL, safeBuffer, ref bufferSize)) != Win32Errors.NO_ERROR)
{
NativeError.ThrowException(retVal);
}
return((NativeMethods.RemoteNameInfo)Marshal.PtrToStructure(safeBuffer.DangerousGetHandle(), typeof(NativeMethods.RemoteNameInfo)));
}
finally
{
if (safeBuffer != null)
{
safeBuffer.Dispose();
}
}
}
public static LinkTargetInfo GetLinkTargetInfo(SafeHandle device)
{
UInt32 bytesReturned;
int lastError = 0;
const int maxCapacity = 0x3FF0;
SafeGlobalMemoryBufferHandle buffer = new SafeGlobalMemoryBufferHandle(512);
try
{
do
{
if (!NativeMethods.DeviceIoControl(device, IoControlCode.FsctlGetReparsePoint, new SafeGlobalMemoryBufferHandle(), 0, buffer, (uint)buffer.Capacity, out bytesReturned, IntPtr.Zero))
{
lastError = Marshal.GetLastWin32Error();
if (lastError == Win32Errors.ERROR_INSUFFICIENT_BUFFER && buffer.Capacity < maxCapacity)
{
buffer.Dispose();
buffer = null;
buffer = new SafeGlobalMemoryBufferHandle(maxCapacity);
continue;
}
NativeError.ThrowException(lastError);
}
else
{
break;
}
}while (true);
IntPtr bufPtr = buffer.DangerousGetHandle();
ReparseDataBufferHeader header = (ReparseDataBufferHeader)Marshal.PtrToStructure(bufPtr, typeof(ReparseDataBufferHeader));
if (header.ReparseTag == ReparsePointTag.MountPoint)
{
MountPointReparseBuffer mpBuf = (MountPointReparseBuffer)Marshal.PtrToStructure(AddPtr(bufPtr, Marshal.OffsetOf(typeof(ReparseDataBufferHeader), "data")), typeof(MountPointReparseBuffer));
IntPtr dataPos = AddPtr(Marshal.OffsetOf(typeof(ReparseDataBufferHeader), "data"), Marshal.OffsetOf(typeof(MountPointReparseBuffer), "data"));
byte[] dataBuffer = new byte[bytesReturned - dataPos.ToInt64()];
Marshal.Copy(AddPtr(bufPtr, dataPos), dataBuffer, 0, dataBuffer.Length);
return(new LinkTargetInfo(
Encoding.Unicode.GetString(dataBuffer, mpBuf.SubstituteNameOffset, mpBuf.SubstituteNameLength),
Encoding.Unicode.GetString(dataBuffer, mpBuf.PrintNameOffset, mpBuf.PrintNameLength)
));
}
else if (header.ReparseTag == ReparsePointTag.SymLink)
{
SymbolicLinkReparseBuffer mpBuf = (SymbolicLinkReparseBuffer)Marshal.PtrToStructure(AddPtr(bufPtr, Marshal.OffsetOf(typeof(ReparseDataBufferHeader), "data")), typeof(SymbolicLinkReparseBuffer));
IntPtr dataPos = AddPtr(Marshal.OffsetOf(typeof(ReparseDataBufferHeader), "data"), Marshal.OffsetOf(typeof(SymbolicLinkReparseBuffer), "data"));
byte[] dataBuffer = new byte[bytesReturned - dataPos.ToInt64()];
Marshal.Copy(AddPtr(bufPtr, dataPos), dataBuffer, 0, dataBuffer.Length);
return(new SymbolicLinkTargetInfo(
Encoding.Unicode.GetString(dataBuffer, mpBuf.SubstituteNameOffset, mpBuf.SubstituteNameLength),
Encoding.Unicode.GetString(dataBuffer, mpBuf.PrintNameOffset, mpBuf.PrintNameLength),
(SymbolicLinkType)mpBuf.Flags
));
}
else
{
throw new UnrecognizedReparsePointException();
}
}
finally
{
if (buffer != null)
{
buffer.Dispose();
}
}
}
