Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / IO / FileInfo.cs / 1 / FileInfo.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== /*============================================================ ** ** Class: File ** ** ** Purpose: A collection of methods for manipulating Files. ** ** April 09,2000 (some design refactorization) ** ===========================================================*/ using System; #if !FEATURE_PAL using System.Security.AccessControl; #endif using System.Security.Permissions; using PermissionSet = System.Security.PermissionSet; using Win32Native = Microsoft.Win32.Win32Native; using System.Runtime.InteropServices; using System.Text; using System.Runtime.Serialization; using System.Globalization; using System.Runtime.Versioning; namespace System.IO { // Class for creating FileStream objects, and some basic file management // routines such as Delete, etc. [Serializable] [ComVisible(true)] public sealed class FileInfo: FileSystemInfo { private String _name; [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] public FileInfo(String fileName) { if (fileName==null) throw new ArgumentNullException("fileName"); OriginalPath = fileName; // Must fully qualify the path for the security check String fullPath = Path.GetFullPathInternal(fileName); new FileIOPermission(FileIOPermissionAccess.Read, new String[] { fullPath }, false, false).Demand(); _name = Path.GetFileName(fileName); FullPath = fullPath; } private FileInfo(SerializationInfo info, StreamingContext context) : base(info, context) { new FileIOPermission(FileIOPermissionAccess.Read, new String[] { FullPath }, false, false).Demand(); _name = Path.GetFileName(OriginalPath); } internal FileInfo(String fullPath, bool ignoreThis) { BCLDebug.Assert(Path.GetRootLength(fullPath) > 0, "fullPath must be fully qualified!"); _name = Path.GetFileName(fullPath); OriginalPath = _name; FullPath = fullPath; } public override String Name { get { return _name; } } public long Length { get { if (_dataInitialised == -1) Refresh(); if (_dataInitialised != 0) // Refresh was unable to initialise the data __Error.WinIOError(_dataInitialised, OriginalPath); if ((_data.fileAttributes & Win32Native.FILE_ATTRIBUTE_DIRECTORY) != 0) __Error.WinIOError(Win32Native.ERROR_FILE_NOT_FOUND,OriginalPath); return ((long)_data.fileSizeHigh) << 32 | ((long)_data.fileSizeLow & 0xFFFFFFFFL); } } /* Returns the name of the directory that the file is in */ public String DirectoryName { get { String directoryName = Path.GetDirectoryName(FullPath); if (directoryName != null) new FileIOPermission(FileIOPermissionAccess.PathDiscovery, new String[] { directoryName }, false, false).Demand(); return directoryName; } } /* Creates an instance of the the parent directory */ public DirectoryInfo Directory { [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] get { String dirName = DirectoryName; if (dirName == null) return null; return new DirectoryInfo(dirName); } } public bool IsReadOnly { get { return (Attributes & FileAttributes.ReadOnly) != 0; } set { if (value) Attributes |= FileAttributes.ReadOnly; else Attributes &= ~FileAttributes.ReadOnly; } } #if !FEATURE_PAL [ResourceExposure(ResourceScope.None)] [ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)] public FileSecurity GetAccessControl() { return File.GetAccessControl(FullPath, AccessControlSections.Access | AccessControlSections.Owner | AccessControlSections.Group); } [ResourceExposure(ResourceScope.None)] [ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)] public FileSecurity GetAccessControl(AccessControlSections includeSections) { return File.GetAccessControl(FullPath, includeSections); } [ResourceExposure(ResourceScope.None)] [ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)] public void SetAccessControl(FileSecurity fileSecurity) { File.SetAccessControl(FullPath, fileSecurity); } #endif [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] public StreamReader OpenText() { return new StreamReader(FullPath, Encoding.UTF8, true, StreamReader.DefaultBufferSize); } [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] public StreamWriter CreateText() { return new StreamWriter(FullPath,false); } [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] public StreamWriter AppendText() { return new StreamWriter(FullPath,true); } // Copies an existing file to a new file. An exception is raised if the // destination file already exists. Use the // Copy(String, String, boolean) method to allow // overwriting an existing file. // // The caller must have certain FileIOPermissions. The caller must have // Read permission to sourceFileName // and Write permissions to destFileName. // [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] public FileInfo CopyTo(String destFileName) { return CopyTo(destFileName, false); } // Copies an existing file to a new file. If overwrite is // false, then an IOException is thrown if the destination file // already exists. If overwrite is true, the file is // overwritten. // // The caller must have certain FileIOPermissions. The caller must have // Read permission to sourceFileName and Create // and Write permissions to destFileName. // [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] public FileInfo CopyTo(String destFileName, bool overwrite) { destFileName = File.InternalCopy(FullPath, destFileName, overwrite); return new FileInfo(destFileName, false); } [ResourceExposure(ResourceScope.None)] [ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)] public FileStream Create() { return File.Create(FullPath); } // Deletes a file. The file specified by the designated path is deleted. // If the file does not exist, Delete succeeds without throwing // an exception. // // On NT, Delete will fail for a file that is open for normal I/O // or a file that is memory mapped. On Win95, the file will be // deleted irregardless of whether the file is being used. // // Your application must have Delete permission to the target file. // [ResourceExposure(ResourceScope.None)] [ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)] public override void Delete() { // For security check, path should be resolved to an absolute path. new FileIOPermission(FileIOPermissionAccess.Write, new String[] { FullPath }, false, false).Demand(); if (Environment.IsWin9X() && System.IO.Directory.InternalExists(FullPath)) // Win9x fails silently for directories throw new UnauthorizedAccessException(String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("UnauthorizedAccess_IODenied_Path"), OriginalPath)); bool r = Win32Native.DeleteFile(FullPath); if (!r) { int hr = Marshal.GetLastWin32Error(); if (hr==Win32Native.ERROR_FILE_NOT_FOUND) return; else __Error.WinIOError(hr, OriginalPath); } } [ComVisible(false)] [ResourceExposure(ResourceScope.None)] [ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)] public void Decrypt() { File.Decrypt(FullPath); } [ComVisible(false)] [ResourceExposure(ResourceScope.None)] [ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)] public void Encrypt() { File.Encrypt(FullPath); } // Tests if the given file exists. The result is true if the file // given by the specified path exists; otherwise, the result is // false. // // Your application must have Read permission for the target directory. public override bool Exists { get { try { if (_dataInitialised == -1) Refresh(); if (_dataInitialised != 0) { // Refresh was unable to initialise the data. // We should normally be throwing an exception here, // but Exists is supposed to return true or false. return false; } return (_data.fileAttributes & Win32Native.FILE_ATTRIBUTE_DIRECTORY) == 0; } catch { return false; } } } // User must explicitly specify opening a new file or appending to one. [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] public FileStream Open(FileMode mode) { return Open(mode, FileAccess.ReadWrite, FileShare.None); } [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] public FileStream Open(FileMode mode, FileAccess access) { return Open(mode, access, FileShare.None); } [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] public FileStream Open(FileMode mode, FileAccess access, FileShare share) { return new FileStream(FullPath, mode, access, share); } [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] public FileStream OpenRead() { return new FileStream(FullPath, FileMode.Open, FileAccess.Read, FileShare.Read); } [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] public FileStream OpenWrite() { return new FileStream(FullPath, FileMode.OpenOrCreate, FileAccess.Write, FileShare.None); } // Moves a given file to a new location and potentially a new file name. // This method does work across volumes. // // The caller must have certain FileIOPermissions. The caller must // have Read and Write permission to // sourceFileName and Write // permissions to destFileName. // [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] public void MoveTo(String destFileName) { if (destFileName==null) throw new ArgumentNullException("destFileName"); if (destFileName.Length==0) throw new ArgumentException(Environment.GetResourceString("Argument_EmptyFileName"), "destFileName"); new FileIOPermission(FileIOPermissionAccess.Write | FileIOPermissionAccess.Read, new String[] { FullPath }, false, false).Demand(); String fullDestFileName = Path.GetFullPathInternal(destFileName); new FileIOPermission(FileIOPermissionAccess.Write, new String[] { fullDestFileName }, false, false).Demand(); if (!Win32Native.MoveFile(FullPath, fullDestFileName)) __Error.WinIOError(); FullPath = fullDestFileName; OriginalPath = destFileName; _name = Path.GetFileName(fullDestFileName); // Flush any cached information about the file. _dataInitialised = -1; } [ComVisible(false)] [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] public FileInfo Replace(String destinationFileName, String destinationBackupFileName) { return Replace(destinationFileName, destinationBackupFileName, false); } [ComVisible(false)] [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] public FileInfo Replace(String destinationFileName, String destinationBackupFileName, bool ignoreMetadataErrors) { File.Replace(FullPath, destinationFileName, destinationBackupFileName, ignoreMetadataErrors); return new FileInfo(destinationFileName); } // Returns the original path public override String ToString() { return OriginalPath; } } }
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