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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.
using Microsoft.Win32;
using System.Runtime.InteropServices;
using System.Runtime.Serialization;
using System.Diagnostics.Contracts;
namespace System.IO
{
#if FEATURE_SERIALIZATION
[Serializable]
#endif
[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
private String _displayPath = ""; // path that can be displayed to the user
protected FileSystemInfo()
{
}
protected FileSystemInfo(SerializationInfo info, StreamingContext context)
{
if (info == null)
throw new ArgumentNullException(nameof(info));
Contract.EndContractBlock();
// Must use V1 field names here, since V1 didn't implement
// ISerializable.
FullPath = Path.GetFullPath(info.GetString("FullPath"));
OriginalPath = info.GetString("OriginalPath");
// Lazily initialize the file attributes.
_dataInitialised = -1;
}
internal void InitializeFrom(Win32Native.WIN32_FIND_DATA findData)
{
_data = new Win32Native.WIN32_FILE_ATTRIBUTE_DATA();
_data.PopulateFrom(findData);
_dataInitialised = 0;
}
// Full path of the direcory/file
public virtual String FullName {
get
{
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 {
// depends on the security check in get_CreationTimeUtc
return CreationTimeUtc.ToLocalTime();
}
}
[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, DisplayPath);
long fileTime = ((long)_data.ftCreationTimeHigh << 32) | _data.ftCreationTimeLow;
return DateTime.FromFileTimeUtc(fileTime);
}
}
public DateTime LastAccessTime
{
get {
// depends on the security check in get_LastAccessTimeUtc
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, DisplayPath);
long fileTime = ((long)_data.ftLastAccessTimeHigh << 32) | _data.ftLastAccessTimeLow;
return DateTime.FromFileTimeUtc(fileTime);
}
set {
}
}
public DateTime LastWriteTime
{
get {
// depends on the security check in get_LastWriteTimeUtc
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, DisplayPath);
long fileTime = ((long)_data.ftLastWriteTimeHigh << 32) | _data.ftLastWriteTimeLow;
return DateTime.FromFileTimeUtc(fileTime);
}
set {
}
}
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, DisplayPath);
return (FileAttributes) _data.fileAttributes;
}
set {
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, DisplayPath);
}
_dataInitialised = -1;
}
}
[ComVisible(false)]
public virtual void GetObjectData(SerializationInfo info, StreamingContext context)
{
info.AddValue("OriginalPath", OriginalPath, typeof(String));
info.AddValue("FullPath", FullPath, typeof(String));
}
internal String DisplayPath
{
get
{
return _displayPath;
}
set
{
_displayPath = value;
}
}
}
}
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