__Error.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / IO / __Error.cs / 1305376 / __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; 
using System.Diagnostics.Contracts;
 
namespace System.IO {
    [Pure]
    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.
        [System.Security.SecurityCritical]  // auto-generated 
        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 (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 (Path.IsDirectorySeparator(path[path.Length - 1])) 
                    path = Environment.GetResourceString("IO.IO_NoPermissionToDirectoryName");
                else
                    path = Path.GetFileName(path);
            } 

            return path; 
        } 

        [System.Security.SecuritySafeCritical]  // auto-generated 
        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.
        [System.Security.SecurityCritical]  // auto-generated
        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(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(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(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(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(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 
        [System.Security.SecuritySafeCritical]  // auto-generated 
        internal static void WinIODriveError(String driveName) {
            int errorCode = Marshal.GetLastWin32Error(); 
            WinIODriveError(driveName, errorCode);
        }

        [System.Security.SecurityCritical]  // auto-generated 
        internal static void WinIODriveError(String driveName, int errorCode)
        { 
            switch (errorCode) { 
            case Win32Native.ERROR_PATH_NOT_FOUND:
            case Win32Native.ERROR_INVALID_DRIVE: 
                throw new DriveNotFoundException(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;
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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