Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / IO / FileSystemInfo.cs / 1 / FileSystemInfo.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== /*============================================================ ** ** Class: FileSystemInfo ** ** ** Purpose: ** ** ===========================================================*/ using System; using System.Collections; using System.Security; using System.Security.Permissions; using Microsoft.Win32; using System.Text; using System.Runtime.InteropServices; using System.Runtime.Serialization; using System.Runtime.Versioning; namespace System.IO { [Serializable] [FileIOPermissionAttribute(SecurityAction.InheritanceDemand,Unrestricted=true)] [ComVisible(true)] public abstract class FileSystemInfo : MarshalByRefObject, ISerializable { internal Win32Native.WIN32_FILE_ATTRIBUTE_DATA _data; // Cache the file information internal int _dataInitialised = -1; // We use this field in conjunction with the Refresh methods, if we succeed // we store a zero, on failure we store the HResult in it so that we can // give back a generic error back. private const int ERROR_INVALID_PARAMETER = 87; internal const int ERROR_ACCESS_DENIED = 0x5; protected String FullPath; // fully qualified path of the directory protected String OriginalPath; // path passed in by the user protected FileSystemInfo() { } [ResourceExposure(ResourceScope.None)] [ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)] protected FileSystemInfo(SerializationInfo info, StreamingContext context) { if (info == null) throw new ArgumentNullException("info"); // Must use V1 field names here, since V1 didn't implement // ISerializable. FullPath = Path.GetFullPathInternal(info.GetString("FullPath")); OriginalPath = info.GetString("OriginalPath"); // Lazily initialize the file attributes. _dataInitialised = -1; } // Full path of the direcory/file public virtual String FullName { get { String demandDir; if (this is DirectoryInfo) demandDir = Directory.GetDemandDir(FullPath, true); else demandDir = FullPath; new FileIOPermission(FileIOPermissionAccess.PathDiscovery, demandDir).Demand(); return FullPath; } } public String Extension { get { // GetFullPathInternal would have already stripped out the terminating "." if present. int length = FullPath.Length; for (int i = length; --i >= 0;) { char ch = FullPath[i]; if (ch == '.') return FullPath.Substring(i, length - i); if (ch == Path.DirectorySeparatorChar || ch == Path.AltDirectorySeparatorChar || ch == Path.VolumeSeparatorChar) break; } return String.Empty; } } // For files name of the file is returned, for directories the last directory in hierarchy is returned if possible, // otherwise the fully qualified name s returned public abstract String Name { get; } // Whether a file/directory exists public abstract bool Exists { get; } // Delete a file/directory public abstract void Delete(); public DateTime CreationTime { get { return CreationTimeUtc.ToLocalTime(); } set { CreationTimeUtc = value.ToUniversalTime(); } } [ComVisible(false)] public DateTime CreationTimeUtc { get { if (_dataInitialised == -1) { _data = new Win32Native.WIN32_FILE_ATTRIBUTE_DATA(); Refresh(); } if (_dataInitialised != 0) // Refresh was unable to initialise the data __Error.WinIOError(_dataInitialised, OriginalPath); long fileTime = ((long)_data.ftCreationTimeHigh << 32) | _data.ftCreationTimeLow; return DateTime.FromFileTimeUtc(fileTime); } [ResourceExposure(ResourceScope.None)] [ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)] set { if (this is DirectoryInfo) Directory.SetCreationTimeUtc(FullPath,value); else File.SetCreationTimeUtc(FullPath,value); _dataInitialised = -1; } } public DateTime LastAccessTime { get { return LastAccessTimeUtc.ToLocalTime(); } set { LastAccessTimeUtc = value.ToUniversalTime(); } } [ComVisible(false)] public DateTime LastAccessTimeUtc { get { if (_dataInitialised == -1) { _data = new Win32Native.WIN32_FILE_ATTRIBUTE_DATA(); Refresh(); } if (_dataInitialised != 0) // Refresh was unable to initialise the data __Error.WinIOError(_dataInitialised, OriginalPath); long fileTime = ((long)_data.ftLastAccessTimeHigh << 32) | _data.ftLastAccessTimeLow; return DateTime.FromFileTimeUtc(fileTime); } [ResourceExposure(ResourceScope.None)] [ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)] set { if (this is DirectoryInfo) Directory.SetLastAccessTimeUtc(FullPath,value); else File.SetLastAccessTimeUtc(FullPath,value); _dataInitialised = -1; } } public DateTime LastWriteTime { get { return LastWriteTimeUtc.ToLocalTime(); } set { LastWriteTimeUtc = value.ToUniversalTime(); } } [ComVisible(false)] public DateTime LastWriteTimeUtc { get { if (_dataInitialised == -1) { _data = new Win32Native.WIN32_FILE_ATTRIBUTE_DATA(); Refresh(); } if (_dataInitialised != 0) // Refresh was unable to initialise the data __Error.WinIOError(_dataInitialised, OriginalPath); long fileTime = ((long)_data.ftLastWriteTimeHigh << 32) | _data.ftLastWriteTimeLow; return DateTime.FromFileTimeUtc(fileTime); } [ResourceExposure(ResourceScope.None)] [ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)] set { if (this is DirectoryInfo) Directory.SetLastWriteTimeUtc(FullPath,value); else File.SetLastWriteTimeUtc(FullPath,value); _dataInitialised = -1; } } [ResourceExposure(ResourceScope.None)] [ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)] public void Refresh() { _dataInitialised = File.FillAttributeInfo(FullPath, ref _data, false, false); } public FileAttributes Attributes { get { if (_dataInitialised == -1) { _data = new Win32Native.WIN32_FILE_ATTRIBUTE_DATA(); Refresh(); // Call refresh to intialise the data } if (_dataInitialised != 0) // Refresh was unable to initialise the data __Error.WinIOError(_dataInitialised, OriginalPath); return (FileAttributes) _data.fileAttributes; } set { new FileIOPermission(FileIOPermissionAccess.Write, FullPath).Demand(); bool r = Win32Native.SetFileAttributes(FullPath, (int) value); if (!r) { int hr = Marshal.GetLastWin32Error(); if (hr==ERROR_INVALID_PARAMETER) throw new ArgumentException(Environment.GetResourceString("Arg_InvalidFileAttrs")); // For whatever reason we are turning ERROR_ACCESS_DENIED into // ArgumentException here (probably done for some 9x code path). // We can't change this now but special casing the error message instead. if (hr == ERROR_ACCESS_DENIED) throw new ArgumentException(Environment.GetResourceString("UnauthorizedAccess_IODenied_NoPathName")); __Error.WinIOError(hr, OriginalPath); } _dataInitialised = -1; } } [ComVisible(false)] [SecurityPermission(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.SerializationFormatter)] public virtual void GetObjectData(SerializationInfo info, StreamingContext context) { new FileIOPermission(FileIOPermissionAccess.PathDiscovery, FullPath).Demand(); info.AddValue("OriginalPath", OriginalPath, typeof(String)); info.AddValue("FullPath", FullPath, typeof(String)); } } }
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