Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / IO / __Error.cs / 1 / __Error.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== /*============================================================ ** ** Class: __Error ** ** ** 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.Security.Permissions; namespace System.IO { // Only static data no need to serialize internal static class __Error { internal static void EndOfFile() { throw new EndOfStreamException(Environment.GetResourceString("IO.EOF_ReadBeyondEOF")); } internal static void FileNotOpen() { throw new ObjectDisposedException(null, Environment.GetResourceString("ObjectDisposed_FileClosed")); } internal static void StreamIsClosed() { throw new ObjectDisposedException(null, Environment.GetResourceString("ObjectDisposed_StreamClosed")); } internal static void MemoryStreamNotExpandable() { throw new NotSupportedException(Environment.GetResourceString("NotSupported_MemStreamNotExpandable")); } internal static void ReaderClosed() { throw new ObjectDisposedException(null, Environment.GetResourceString("ObjectDisposed_ReaderClosed")); } internal static void ReadNotSupported() { throw new NotSupportedException(Environment.GetResourceString("NotSupported_UnreadableStream")); } internal static void SeekNotSupported() { throw new NotSupportedException(Environment.GetResourceString("NotSupported_UnseekableStream")); } internal static void WrongAsyncResult() { throw new ArgumentException(Environment.GetResourceString("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(Environment.GetResourceString("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(Environment.GetResourceString("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 path; // Is it a fully qualified path? bool isFullyQualified = false; if (path.Length < 2) return path; if (Path.IsDirectorySeparator(path[0]) && Path.IsDirectorySeparator(path[1])) isFullyQualified = true; else if (path[1] == Path.VolumeSeparatorChar) { isFullyQualified = true; } if (!isFullyQualified && !isInvalidPath) return path; bool safeToReturn = false; try { if (!isInvalidPath) { new FileIOPermission(FileIOPermissionAccess.PathDiscovery, new String[] { path }, false, false).Demand(); safeToReturn = true; } } catch(ArgumentException) { // Needed for Win9x } catch(NotSupportedException) { // Needed for Win9x, which will sometimes return // ERROR_PATH_NOT_FOUND for invalid path names, but also // will leak the current working directory. } catch(SecurityException) { } if (!safeToReturn) { if (Path.IsDirectorySeparator(path[path.Length - 1])) path = Environment.GetResourceString("IO.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(Environment.GetResourceString("IO.FileNotFound")); else throw new FileNotFoundException(String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("IO.FileNotFound_FileName"), str), str); case Win32Native.ERROR_PATH_NOT_FOUND: if (str.Length == 0) throw new DirectoryNotFoundException(Environment.GetResourceString("IO.PathNotFound_NoPathName")); else throw new DirectoryNotFoundException(String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("IO.PathNotFound_Path"), str)); case Win32Native.ERROR_ACCESS_DENIED: if (str.Length == 0) throw new UnauthorizedAccessException(Environment.GetResourceString("UnauthorizedAccess_IODenied_NoPathName")); else throw new UnauthorizedAccessException(String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("UnauthorizedAccess_IODenied_Path"), str)); case Win32Native.ERROR_ALREADY_EXISTS: if (str.Length == 0) goto default; throw new IOException(Environment.GetResourceString("IO.IO_AlreadyExists_Name", str), Win32Native.MakeHRFromErrorCode(errorCode), maybeFullPath); case Win32Native.ERROR_FILENAME_EXCED_RANGE: throw new PathTooLongException(Environment.GetResourceString("IO.PathTooLong")); case Win32Native.ERROR_INVALID_DRIVE: throw new DriveNotFoundException(String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("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(Environment.GetResourceString("IO.IO_SharingViolation_NoFileName"), Win32Native.MakeHRFromErrorCode(errorCode), maybeFullPath); else throw new IOException(Environment.GetResourceString("IO.IO_SharingViolation_File", str), Win32Native.MakeHRFromErrorCode(errorCode), maybeFullPath); case Win32Native.ERROR_FILE_EXISTS: if (str.Length == 0) goto default; throw new IOException(String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("IO.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); } } // An alternative to WinIOError with friendlier messages for drives internal static void WinIODriveError(String driveName) { int errorCode = Marshal.GetLastWin32Error(); WinIODriveError(driveName, errorCode); } internal static void WinIODriveError(String driveName, int errorCode) { switch (errorCode) { case Win32Native.ERROR_PATH_NOT_FOUND: case Win32Native.ERROR_INVALID_DRIVE: throw new DriveNotFoundException(String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("IO.DriveNotFound_Drive"), driveName)); default: WinIOError(errorCode, driveName); break; } } internal static void WriteNotSupported() { throw new NotSupportedException(Environment.GetResourceString("NotSupported_UnwritableStream")); } internal static void WriterClosed() { throw new ObjectDisposedException(null, Environment.GetResourceString("ObjectDisposed_WriterClosed")); } // From WinError.h internal const int ERROR_FILE_NOT_FOUND = Win32Native.ERROR_FILE_NOT_FOUND; internal const int ERROR_PATH_NOT_FOUND = Win32Native.ERROR_PATH_NOT_FOUND; internal const int ERROR_ACCESS_DENIED = Win32Native.ERROR_ACCESS_DENIED; internal const int ERROR_INVALID_PARAMETER = Win32Native.ERROR_INVALID_PARAMETER; } }
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