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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
/*============================================================
**
**
**
**
**
** Purpose: Centralized error methods for the IO package.
** Mostly useful for translating Win32 HRESULTs into meaningful
** error strings & exceptions.
**
**
===========================================================*/
using System;
using System.Runtime.InteropServices;
using Win32Native = Microsoft.Win32.Win32Native;
using System.Text;
using System.Globalization;
using System.Security;
using System.Diagnostics.Contracts;
namespace System.IO
{
[Pure]
internal static class __Error
{
internal static void EndOfFile()
{
throw new EndOfStreamException(SR.IO_EOF_ReadBeyondEOF);
}
internal static void FileNotOpen()
{
throw new ObjectDisposedException(null, SR.ObjectDisposed_FileClosed);
}
internal static void StreamIsClosed()
{
throw new ObjectDisposedException(null, SR.ObjectDisposed_StreamClosed);
}
internal static void MemoryStreamNotExpandable()
{
throw new NotSupportedException(SR.NotSupported_MemStreamNotExpandable);
}
internal static void ReaderClosed()
{
throw new ObjectDisposedException(null, SR.ObjectDisposed_ReaderClosed);
}
internal static void ReadNotSupported()
{
throw new NotSupportedException(SR.NotSupported_UnreadableStream);
}
internal static void WrongAsyncResult()
{
throw new ArgumentException(SR.Arg_WrongAsyncResult);
}
internal static void EndReadCalledTwice()
{
// Should ideally be InvalidOperationExc but we can't maitain parity with Stream and FileStream without some work
throw new ArgumentException(SR.InvalidOperation_EndReadCalledMultiple);
}
internal static void EndWriteCalledTwice()
{
// Should ideally be InvalidOperationExc but we can't maintain parity with Stream and FileStream without some work
throw new ArgumentException(SR.InvalidOperation_EndWriteCalledMultiple);
}
// Given a possible fully qualified path, ensure that we have path
// discovery permission to that path. If we do not, return just the
// file name. If we know it is a directory, then don't return the
// directory name.
internal static String GetDisplayablePath(String path, bool isInvalidPath)
{
if (String.IsNullOrEmpty(path))
return String.Empty;
// Is it a fully qualified path?
bool isFullyQualified = false;
if (path.Length < 2)
return path;
if (PathInternal.IsDirectorySeparator(path[0]) && PathInternal.IsDirectorySeparator(path[1]))
isFullyQualified = true;
else if (path[1] == Path.VolumeSeparatorChar)
{
isFullyQualified = true;
}
if (!isFullyQualified && !isInvalidPath)
return path;
bool safeToReturn = false;
try
{
if (!isInvalidPath)
{
safeToReturn = true;
}
}
catch (SecurityException)
{
}
catch (ArgumentException)
{
// ? and * characters cause ArgumentException to be thrown from HasIllegalCharacters
// inside FileIOPermission.AddPathList
}
catch (NotSupportedException)
{
// paths like "!Bogus\\dir:with/junk_.in it" can cause NotSupportedException to be thrown
// from Security.Util.StringExpressionSet.CanonicalizePath when ':' is found in the path
// beyond string index position 1.
}
if (!safeToReturn)
{
if (PathInternal.IsDirectorySeparator(path[path.Length - 1]))
path = SR.IO_NoPermissionToDirectoryName;
else
path = Path.GetFileName(path);
}
return path;
}
internal static void WinIOError()
{
int errorCode = Marshal.GetLastWin32Error();
WinIOError(errorCode, String.Empty);
}
// After calling GetLastWin32Error(), it clears the last error field,
// so you must save the HResult and pass it to this method. This method
// will determine the appropriate exception to throw dependent on your
// error, and depending on the error, insert a string into the message
// gotten from the ResourceManager.
internal static void WinIOError(int errorCode, String maybeFullPath)
{
// This doesn't have to be perfect, but is a perf optimization.
bool isInvalidPath = errorCode == Win32Native.ERROR_INVALID_NAME || errorCode == Win32Native.ERROR_BAD_PATHNAME;
String str = GetDisplayablePath(maybeFullPath, isInvalidPath);
switch (errorCode)
{
case Win32Native.ERROR_FILE_NOT_FOUND:
if (str.Length == 0)
throw new FileNotFoundException(SR.IO_FileNotFound);
else
throw new FileNotFoundException(SR.Format(SR.IO_FileNotFound_FileName, str), str);
case Win32Native.ERROR_PATH_NOT_FOUND:
if (str.Length == 0)
throw new DirectoryNotFoundException(SR.IO_PathNotFound_NoPathName);
else
throw new DirectoryNotFoundException(SR.Format(SR.IO_PathNotFound_Path, str));
case Win32Native.ERROR_ACCESS_DENIED:
if (str.Length == 0)
throw new UnauthorizedAccessException(SR.UnauthorizedAccess_IODenied_NoPathName);
else
throw new UnauthorizedAccessException(SR.Format(SR.UnauthorizedAccess_IODenied_Path, str));
case Win32Native.ERROR_ALREADY_EXISTS:
if (str.Length == 0)
goto default;
throw new IOException(SR.Format(SR.IO_AlreadyExists_Name, str), Win32Native.MakeHRFromErrorCode(errorCode), maybeFullPath);
case Win32Native.ERROR_FILENAME_EXCED_RANGE:
throw new PathTooLongException(SR.IO_PathTooLong);
case Win32Native.ERROR_INVALID_DRIVE:
throw new DriveNotFoundException(SR.Format(SR.IO_DriveNotFound_Drive, str));
case Win32Native.ERROR_INVALID_PARAMETER:
throw new IOException(Win32Native.GetMessage(errorCode), Win32Native.MakeHRFromErrorCode(errorCode), maybeFullPath);
case Win32Native.ERROR_SHARING_VIOLATION:
if (str.Length == 0)
throw new IOException(SR.IO_SharingViolation_NoFileName, Win32Native.MakeHRFromErrorCode(errorCode), maybeFullPath);
else
throw new IOException(SR.Format(SR.IO_SharingViolation_File, str), Win32Native.MakeHRFromErrorCode(errorCode), maybeFullPath);
case Win32Native.ERROR_FILE_EXISTS:
if (str.Length == 0)
goto default;
throw new IOException(SR.Format(SR.IO_FileExists_Name, str), Win32Native.MakeHRFromErrorCode(errorCode), maybeFullPath);
case Win32Native.ERROR_OPERATION_ABORTED:
throw new OperationCanceledException();
default:
throw new IOException(Win32Native.GetMessage(errorCode), Win32Native.MakeHRFromErrorCode(errorCode), maybeFullPath);
}
}
internal static void WriteNotSupported()
{
throw new NotSupportedException(SR.NotSupported_UnwritableStream);
}
}
}
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