1169 lines
32 KiB
C#
1169 lines
32 KiB
C#
//
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// System.IO.FileStream.cs
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//
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// Authors:
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// Dietmar Maurer (dietmar@ximian.com)
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// Dan Lewis (dihlewis@yahoo.co.uk)
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// Gonzalo Paniagua Javier (gonzalo@ximian.com)
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// Marek Safar (marek.safar@gmail.com)
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//
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// (C) 2001-2003 Ximian, Inc. http://www.ximian.com
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// Copyright (C) 2004-2005, 2008, 2010 Novell, Inc (http://www.novell.com)
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// Copyright 2011 Xamarin Inc (http://www.xamarin.com).
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System.Collections;
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using System.Globalization;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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using System.Runtime.Remoting.Messaging;
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using System.Security;
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using System.Security.Permissions;
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using System.Threading;
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using Microsoft.Win32.SafeHandles;
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#if NET_2_1
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using System.IO.IsolatedStorage;
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#else
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using System.Security.AccessControl;
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#endif
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using System.Threading.Tasks;
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namespace System.IO
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{
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[ComVisible (true)]
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public class FileStream : Stream
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{
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// construct from handle
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[Obsolete ("Use FileStream(SafeFileHandle handle, FileAccess access) instead")]
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public FileStream (IntPtr handle, FileAccess access)
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: this (handle, access, true, DefaultBufferSize, false, false) {}
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[Obsolete ("Use FileStream(SafeFileHandle handle, FileAccess access) instead")]
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public FileStream (IntPtr handle, FileAccess access, bool ownsHandle)
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: this (handle, access, ownsHandle, DefaultBufferSize, false, false) {}
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[Obsolete ("Use FileStream(SafeFileHandle handle, FileAccess access, int bufferSize) instead")]
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public FileStream (IntPtr handle, FileAccess access, bool ownsHandle, int bufferSize)
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: this (handle, access, ownsHandle, bufferSize, false, false) {}
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[Obsolete ("Use FileStream(SafeFileHandle handle, FileAccess access, int bufferSize, bool isAsync) instead")]
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public FileStream (IntPtr handle, FileAccess access, bool ownsHandle, int bufferSize, bool isAsync)
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: this (handle, access, ownsHandle, bufferSize, isAsync, false) {}
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[SecurityPermission (SecurityAction.Demand, UnmanagedCode = true)]
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internal FileStream (IntPtr handle, FileAccess access, bool ownsHandle, int bufferSize, bool isAsync, bool isZeroSize)
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{
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if (handle == MonoIO.InvalidHandle)
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throw new ArgumentException ("handle", Locale.GetText ("Invalid."));
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Init (new SafeFileHandle (handle, false), access, ownsHandle, bufferSize, isAsync, isZeroSize);
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}
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// construct from filename
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public FileStream (string path, FileMode mode)
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: this (path, mode, (mode == FileMode.Append ? FileAccess.Write : FileAccess.ReadWrite), FileShare.Read, DefaultBufferSize, false, FileOptions.None)
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{
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}
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public FileStream (string path, FileMode mode, FileAccess access)
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: this (path, mode, access, access == FileAccess.Write ? FileShare.None : FileShare.Read, DefaultBufferSize, false, false)
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{
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}
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public FileStream (string path, FileMode mode, FileAccess access, FileShare share)
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: this (path, mode, access, share, DefaultBufferSize, false, FileOptions.None)
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{
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}
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public FileStream (string path, FileMode mode, FileAccess access, FileShare share, int bufferSize)
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: this (path, mode, access, share, bufferSize, false, FileOptions.None)
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{
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}
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public FileStream (string path, FileMode mode, FileAccess access, FileShare share, int bufferSize, bool useAsync)
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: this (path, mode, access, share, bufferSize, useAsync ? FileOptions.Asynchronous : FileOptions.None)
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{
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}
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public FileStream (string path, FileMode mode, FileAccess access, FileShare share, int bufferSize, FileOptions options)
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: this (path, mode, access, share, bufferSize, false, options)
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{
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}
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#if !NET_2_1
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public FileStream (SafeFileHandle handle, FileAccess access)
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:this(handle, access, DefaultBufferSize, false)
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{
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}
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public FileStream (SafeFileHandle handle, FileAccess access,
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int bufferSize)
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:this(handle, access, bufferSize, false)
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{
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}
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public FileStream (SafeFileHandle handle, FileAccess access, int bufferSize, bool isAsync)
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{
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Init (handle, access, false, bufferSize, isAsync, false);
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}
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[MonoLimitation ("This ignores the rights parameter")]
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public FileStream (string path, FileMode mode,
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FileSystemRights rights, FileShare share,
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int bufferSize, FileOptions options)
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: this (path, mode, (mode == FileMode.Append ? FileAccess.Write : FileAccess.ReadWrite), share, bufferSize, false, options)
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{
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}
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[MonoLimitation ("This ignores the rights and fileSecurity parameters")]
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public FileStream (string path, FileMode mode,
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FileSystemRights rights, FileShare share,
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int bufferSize, FileOptions options,
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FileSecurity fileSecurity)
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: this (path, mode, (mode == FileMode.Append ? FileAccess.Write : FileAccess.ReadWrite), share, bufferSize, false, options)
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{
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}
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#endif
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internal FileStream (string path, FileMode mode, FileAccess access, FileShare share, int bufferSize, FileOptions options, string msgPath, bool bFromProxy, bool useLongPath = false, bool checkHost = false)
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: this (path, mode, access, share, bufferSize, false, options)
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{
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}
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internal FileStream (string path, FileMode mode, FileAccess access, FileShare share, int bufferSize, bool isAsync, bool anonymous)
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: this (path, mode, access, share, bufferSize, anonymous, isAsync ? FileOptions.Asynchronous : FileOptions.None)
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{
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}
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internal FileStream (string path, FileMode mode, FileAccess access, FileShare share, int bufferSize, bool anonymous, FileOptions options)
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{
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if (path == null) {
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throw new ArgumentNullException ("path");
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}
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if (path.Length == 0) {
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throw new ArgumentException ("Path is empty");
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}
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this.anonymous = anonymous;
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// ignore the Inheritable flag
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share &= ~FileShare.Inheritable;
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if (bufferSize <= 0)
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throw new ArgumentOutOfRangeException ("bufferSize", "Positive number required.");
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if (mode < FileMode.CreateNew || mode > FileMode.Append) {
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#if NET_2_1
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if (anonymous)
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throw new ArgumentException ("mode", "Enum value was out of legal range.");
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else
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#endif
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throw new ArgumentOutOfRangeException ("mode", "Enum value was out of legal range.");
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}
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if (access < FileAccess.Read || access > FileAccess.ReadWrite) {
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throw new ArgumentOutOfRangeException ("access", "Enum value was out of legal range.");
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}
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if (share < FileShare.None || share > (FileShare.ReadWrite | FileShare.Delete)) {
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throw new ArgumentOutOfRangeException ("share", "Enum value was out of legal range.");
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}
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if (path.IndexOfAny (Path.InvalidPathChars) != -1) {
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throw new ArgumentException ("Name has invalid chars");
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}
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if (Directory.Exists (path)) {
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// don't leak the path information for isolated storage
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string msg = Locale.GetText ("Access to the path '{0}' is denied.");
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throw new UnauthorizedAccessException (String.Format (msg, GetSecureFileName (path, false)));
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}
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/* Append streams can't be read (see FileMode
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* docs)
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*/
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if (mode==FileMode.Append &&
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(access&FileAccess.Read)==FileAccess.Read) {
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throw new ArgumentException("Append access can be requested only in write-only mode.");
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}
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if ((access & FileAccess.Write) == 0 &&
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(mode != FileMode.Open && mode != FileMode.OpenOrCreate)) {
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string msg = Locale.GetText ("Combining FileMode: {0} with " +
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"FileAccess: {1} is invalid.");
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throw new ArgumentException (string.Format (msg, access, mode));
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}
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SecurityManager.EnsureElevatedPermissions (); // this is a no-op outside moonlight
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string dname;
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if (Path.DirectorySeparatorChar != '/' && path.IndexOf ('/') >= 0)
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dname = Path.GetDirectoryName (Path.GetFullPath (path));
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else
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dname = Path.GetDirectoryName (path);
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if (dname.Length > 0) {
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string fp = Path.GetFullPath (dname);
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if (!Directory.Exists (fp)) {
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// don't leak the path information for isolated storage
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string msg = Locale.GetText ("Could not find a part of the path \"{0}\".");
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string fname = (anonymous) ? dname : Path.GetFullPath (path);
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throw new DirectoryNotFoundException (String.Format (msg, fname));
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}
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}
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if (access == FileAccess.Read && mode != FileMode.Create && mode != FileMode.OpenOrCreate &&
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mode != FileMode.CreateNew && !File.Exists (path)) {
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// don't leak the path information for isolated storage
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string msg = Locale.GetText ("Could not find file \"{0}\".");
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string fname = GetSecureFileName (path);
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throw new FileNotFoundException (String.Format (msg, fname), fname);
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}
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// IsolatedStorage needs to keep the Name property to the default "[Unknown]"
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if (!anonymous)
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this.name = path;
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// TODO: demand permissions
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MonoIOError error;
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var nativeHandle = MonoIO.Open (path, mode, access, share, options, out error);
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if (nativeHandle == MonoIO.InvalidHandle) {
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// don't leak the path information for isolated storage
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throw MonoIO.GetException (GetSecureFileName (path), error);
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}
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this.safeHandle = new SafeFileHandle (nativeHandle, false);
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this.access = access;
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this.owner = true;
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/* Can we open non-files by name? */
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if (MonoIO.GetFileType (safeHandle, out error) == MonoFileType.Disk) {
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this.canseek = true;
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this.async = (options & FileOptions.Asynchronous) != 0;
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} else {
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this.canseek = false;
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this.async = false;
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}
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if (access == FileAccess.Read && canseek && (bufferSize == DefaultBufferSize)) {
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/* Avoid allocating a large buffer for small files */
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long len = Length;
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if (bufferSize > len) {
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bufferSize = (int)(len < 1000 ? 1000 : len);
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}
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}
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InitBuffer (bufferSize, false);
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if (mode==FileMode.Append) {
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this.Seek (0, SeekOrigin.End);
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this.append_startpos=this.Position;
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} else {
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this.append_startpos=0;
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}
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}
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private void Init (SafeFileHandle safeHandle, FileAccess access, bool ownsHandle, int bufferSize, bool isAsync, bool isZeroSize)
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{
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if (access < FileAccess.Read || access > FileAccess.ReadWrite)
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throw new ArgumentOutOfRangeException ("access");
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MonoIOError error;
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MonoFileType ftype = MonoIO.GetFileType (safeHandle, out error);
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if (error != MonoIOError.ERROR_SUCCESS) {
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throw MonoIO.GetException (name, error);
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}
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if (ftype == MonoFileType.Unknown) {
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throw new IOException ("Invalid handle.");
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} else if (ftype == MonoFileType.Disk) {
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this.canseek = true;
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} else {
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this.canseek = false;
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}
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this.safeHandle = safeHandle;
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ExposeHandle ();
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this.access = access;
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this.owner = ownsHandle;
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this.async = isAsync;
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this.anonymous = false;
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if (canseek) {
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buf_start = MonoIO.Seek (safeHandle, 0, SeekOrigin.Current, out error);
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if (error != MonoIOError.ERROR_SUCCESS) {
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throw MonoIO.GetException (name, error);
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}
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}
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/* Can't set append mode */
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this.append_startpos=0;
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}
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// properties
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public override bool CanRead {
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get {
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return access == FileAccess.Read ||
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access == FileAccess.ReadWrite;
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}
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}
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public override bool CanWrite {
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get {
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return access == FileAccess.Write ||
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access == FileAccess.ReadWrite;
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}
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}
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public override bool CanSeek {
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get {
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return(canseek);
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}
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}
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public virtual bool IsAsync {
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get {
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return (async);
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}
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}
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public string Name {
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get {
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return name;
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}
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}
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public override long Length {
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get {
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if (safeHandle.IsClosed)
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throw new ObjectDisposedException ("Stream has been closed");
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if (!CanSeek)
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throw new NotSupportedException ("The stream does not support seeking");
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// Buffered data might change the length of the stream
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FlushBufferIfDirty ();
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MonoIOError error;
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long length = MonoIO.GetLength (safeHandle, out error);
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if (error != MonoIOError.ERROR_SUCCESS) {
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// don't leak the path information for isolated storage
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throw MonoIO.GetException (GetSecureFileName (name), error);
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}
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return(length);
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}
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}
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public override long Position {
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get {
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if (safeHandle.IsClosed)
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throw new ObjectDisposedException ("Stream has been closed");
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if (CanSeek == false)
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throw new NotSupportedException("The stream does not support seeking");
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if (!isExposed)
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return(buf_start + buf_offset);
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// If the handle was leaked outside we always ask the real handle
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MonoIOError error;
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long ret = MonoIO.Seek (safeHandle, 0, SeekOrigin.Current, out error);
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if (error != MonoIOError.ERROR_SUCCESS) {
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// don't leak the path information for isolated storage
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throw MonoIO.GetException (GetSecureFileName (name), error);
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}
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return ret;
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}
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set {
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if(value < 0) {
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throw new ArgumentOutOfRangeException("Attempt to set the position to a negative value");
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}
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Seek (value, SeekOrigin.Begin);
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}
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}
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[Obsolete ("Use SafeFileHandle instead")]
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public virtual IntPtr Handle {
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[SecurityPermission (SecurityAction.LinkDemand, UnmanagedCode = true)]
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[SecurityPermission (SecurityAction.InheritanceDemand, UnmanagedCode = true)]
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get {
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var handle = safeHandle.DangerousGetHandle ();
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if (!isExposed)
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ExposeHandle ();
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return handle;
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}
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}
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public virtual SafeFileHandle SafeFileHandle {
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[SecurityPermission (SecurityAction.LinkDemand, UnmanagedCode = true)]
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[SecurityPermission (SecurityAction.InheritanceDemand, UnmanagedCode = true)]
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get {
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if (!isExposed)
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ExposeHandle ();
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return safeHandle;
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}
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}
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void ExposeHandle ()
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{
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isExposed = true;
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FlushBuffer ();
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InitBuffer (0, true);
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}
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// methods
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public override int ReadByte ()
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{
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if (safeHandle.IsClosed)
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throw new ObjectDisposedException ("Stream has been closed");
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if (!CanRead)
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throw new NotSupportedException ("Stream does not support reading");
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if (buf_size == 0) {
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int n = ReadData (safeHandle, buf, 0, 1);
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if (n == 0) return -1;
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else return buf[0];
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}
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else if (buf_offset >= buf_length) {
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RefillBuffer ();
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if (buf_length == 0)
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return -1;
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}
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return buf [buf_offset ++];
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}
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public override void WriteByte (byte value)
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{
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if (safeHandle.IsClosed)
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throw new ObjectDisposedException ("Stream has been closed");
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if (!CanWrite)
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throw new NotSupportedException ("Stream does not support writing");
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if (buf_offset == buf_size)
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FlushBuffer ();
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if (buf_size == 0) { // No buffering
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buf [0] = value;
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buf_dirty = true;
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buf_length = 1;
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FlushBuffer ();
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return;
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}
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buf [buf_offset ++] = value;
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if (buf_offset > buf_length)
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buf_length = buf_offset;
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buf_dirty = true;
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}
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public override int Read ([In,Out] byte[] array, int offset, int count)
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{
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if (safeHandle.IsClosed)
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throw new ObjectDisposedException ("Stream has been closed");
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if (array == null)
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throw new ArgumentNullException ("array");
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if (!CanRead)
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throw new NotSupportedException ("Stream does not support reading");
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int len = array.Length;
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if (offset < 0)
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throw new ArgumentOutOfRangeException ("offset", "< 0");
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if (count < 0)
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throw new ArgumentOutOfRangeException ("count", "< 0");
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if (offset > len)
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throw new ArgumentException ("destination offset is beyond array size");
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// reordered to avoid possible integer overflow
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if (offset > len - count)
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throw new ArgumentException ("Reading would overrun buffer");
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if (async) {
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IAsyncResult ares = BeginRead (array, offset, count, null, null);
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return EndRead (ares);
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}
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return ReadInternal (array, offset, count);
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}
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int ReadInternal (byte [] dest, int offset, int count)
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{
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int n = ReadSegment (dest, offset, count);
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if (n == count) {
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return count;
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}
|
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int copied = n;
|
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count -= n;
|
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|
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if (count > buf_size) {
|
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/* Read as much as we can, up
|
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* to count bytes
|
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*/
|
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FlushBuffer();
|
|
n = ReadData (safeHandle, dest, offset+n, count);
|
|
|
|
/* Make the next buffer read
|
|
* start from the right place
|
|
*/
|
|
buf_start += n;
|
|
} else {
|
|
RefillBuffer ();
|
|
n = ReadSegment (dest, offset+copied, count);
|
|
}
|
|
|
|
return copied + n;
|
|
}
|
|
|
|
delegate int ReadDelegate (byte [] buffer, int offset, int count);
|
|
|
|
public override IAsyncResult BeginRead (byte [] array, int offset, int numBytes,
|
|
AsyncCallback userCallback, object stateObject)
|
|
{
|
|
if (safeHandle.IsClosed)
|
|
throw new ObjectDisposedException ("Stream has been closed");
|
|
|
|
if (!CanRead)
|
|
throw new NotSupportedException ("This stream does not support reading");
|
|
|
|
if (array == null)
|
|
throw new ArgumentNullException ("array");
|
|
|
|
if (numBytes < 0)
|
|
throw new ArgumentOutOfRangeException ("numBytes", "Must be >= 0");
|
|
|
|
if (offset < 0)
|
|
throw new ArgumentOutOfRangeException ("offset", "Must be >= 0");
|
|
|
|
// reordered to avoid possible integer overflow
|
|
if (numBytes > array.Length - offset)
|
|
throw new ArgumentException ("Buffer too small. numBytes/offset wrong.");
|
|
|
|
if (!async)
|
|
return base.BeginRead (array, offset, numBytes, userCallback, stateObject);
|
|
|
|
ReadDelegate r = new ReadDelegate (ReadInternal);
|
|
return r.BeginInvoke (array, offset, numBytes, userCallback, stateObject);
|
|
}
|
|
|
|
public override int EndRead (IAsyncResult asyncResult)
|
|
{
|
|
if (asyncResult == null)
|
|
throw new ArgumentNullException ("asyncResult");
|
|
|
|
if (!async)
|
|
return base.EndRead (asyncResult);
|
|
|
|
AsyncResult ares = asyncResult as AsyncResult;
|
|
if (ares == null)
|
|
throw new ArgumentException ("Invalid IAsyncResult", "asyncResult");
|
|
|
|
ReadDelegate r = ares.AsyncDelegate as ReadDelegate;
|
|
if (r == null)
|
|
throw new ArgumentException ("Invalid IAsyncResult", "asyncResult");
|
|
|
|
return r.EndInvoke (asyncResult);
|
|
}
|
|
|
|
public override void Write (byte[] array, int offset, int count)
|
|
{
|
|
if (safeHandle.IsClosed)
|
|
throw new ObjectDisposedException ("Stream has been closed");
|
|
if (array == null)
|
|
throw new ArgumentNullException ("array");
|
|
if (offset < 0)
|
|
throw new ArgumentOutOfRangeException ("offset", "< 0");
|
|
if (count < 0)
|
|
throw new ArgumentOutOfRangeException ("count", "< 0");
|
|
// ordered to avoid possible integer overflow
|
|
if (offset > array.Length - count)
|
|
throw new ArgumentException ("Reading would overrun buffer");
|
|
if (!CanWrite)
|
|
throw new NotSupportedException ("Stream does not support writing");
|
|
|
|
if (async) {
|
|
IAsyncResult ares = BeginWrite (array, offset, count, null, null);
|
|
EndWrite (ares);
|
|
return;
|
|
}
|
|
|
|
WriteInternal (array, offset, count);
|
|
}
|
|
|
|
void WriteInternal (byte [] src, int offset, int count)
|
|
{
|
|
if (count > buf_size) {
|
|
// shortcut for long writes
|
|
MonoIOError error;
|
|
|
|
FlushBuffer ();
|
|
int wcount = count;
|
|
|
|
while (wcount > 0){
|
|
int n = MonoIO.Write (safeHandle, src, offset, wcount, out error);
|
|
if (error != MonoIOError.ERROR_SUCCESS)
|
|
throw MonoIO.GetException (GetSecureFileName (name), error);
|
|
|
|
wcount -= n;
|
|
offset += n;
|
|
}
|
|
buf_start += count;
|
|
} else {
|
|
|
|
int copied = 0;
|
|
while (count > 0) {
|
|
|
|
int n = WriteSegment (src, offset + copied, count);
|
|
copied += n;
|
|
count -= n;
|
|
|
|
if (count == 0) {
|
|
break;
|
|
}
|
|
|
|
FlushBuffer ();
|
|
}
|
|
}
|
|
}
|
|
|
|
delegate void WriteDelegate (byte [] buffer, int offset, int count);
|
|
|
|
public override IAsyncResult BeginWrite (byte [] array, int offset, int numBytes,
|
|
AsyncCallback userCallback, object stateObject)
|
|
{
|
|
if (safeHandle.IsClosed)
|
|
throw new ObjectDisposedException ("Stream has been closed");
|
|
|
|
if (!CanWrite)
|
|
throw new NotSupportedException ("This stream does not support writing");
|
|
|
|
if (array == null)
|
|
throw new ArgumentNullException ("array");
|
|
|
|
if (numBytes < 0)
|
|
throw new ArgumentOutOfRangeException ("numBytes", "Must be >= 0");
|
|
|
|
if (offset < 0)
|
|
throw new ArgumentOutOfRangeException ("offset", "Must be >= 0");
|
|
|
|
// reordered to avoid possible integer overflow
|
|
if (numBytes > array.Length - offset)
|
|
throw new ArgumentException ("array too small. numBytes/offset wrong.");
|
|
|
|
if (!async)
|
|
return base.BeginWrite (array, offset, numBytes, userCallback, stateObject);
|
|
|
|
FileStreamAsyncResult result = new FileStreamAsyncResult (userCallback, stateObject);
|
|
result.BytesRead = -1;
|
|
result.Count = numBytes;
|
|
result.OriginalCount = numBytes;
|
|
/*
|
|
if (buf_dirty) {
|
|
MemoryStream ms = new MemoryStream ();
|
|
FlushBuffer (ms);
|
|
ms.Write (array, offset, numBytes);
|
|
|
|
// Set arguments to new compounded buffer
|
|
offset = 0;
|
|
array = ms.ToArray ();
|
|
numBytes = array.Length;
|
|
}
|
|
*/
|
|
WriteDelegate w = WriteInternal;
|
|
return w.BeginInvoke (array, offset, numBytes, userCallback, stateObject);
|
|
}
|
|
|
|
public override void EndWrite (IAsyncResult asyncResult)
|
|
{
|
|
if (asyncResult == null)
|
|
throw new ArgumentNullException ("asyncResult");
|
|
|
|
if (!async) {
|
|
base.EndWrite (asyncResult);
|
|
return;
|
|
}
|
|
|
|
AsyncResult ares = asyncResult as AsyncResult;
|
|
if (ares == null)
|
|
throw new ArgumentException ("Invalid IAsyncResult", "asyncResult");
|
|
|
|
WriteDelegate w = ares.AsyncDelegate as WriteDelegate;
|
|
if (w == null)
|
|
throw new ArgumentException ("Invalid IAsyncResult", "asyncResult");
|
|
|
|
w.EndInvoke (asyncResult);
|
|
return;
|
|
}
|
|
|
|
public override long Seek (long offset, SeekOrigin origin)
|
|
{
|
|
long pos;
|
|
|
|
if (safeHandle.IsClosed)
|
|
throw new ObjectDisposedException ("Stream has been closed");
|
|
|
|
// make absolute
|
|
|
|
if(CanSeek == false) {
|
|
throw new NotSupportedException("The stream does not support seeking");
|
|
}
|
|
|
|
switch (origin) {
|
|
case SeekOrigin.End:
|
|
pos = Length + offset;
|
|
break;
|
|
|
|
case SeekOrigin.Current:
|
|
pos = Position + offset;
|
|
break;
|
|
|
|
case SeekOrigin.Begin:
|
|
pos = offset;
|
|
break;
|
|
|
|
default:
|
|
throw new ArgumentException ("origin", "Invalid SeekOrigin");
|
|
}
|
|
|
|
if (pos < 0) {
|
|
/* LAMESPEC: shouldn't this be
|
|
* ArgumentOutOfRangeException?
|
|
*/
|
|
throw new IOException("Attempted to Seek before the beginning of the stream");
|
|
}
|
|
|
|
if(pos < this.append_startpos) {
|
|
/* More undocumented crap */
|
|
throw new IOException("Can't seek back over pre-existing data in append mode");
|
|
}
|
|
|
|
FlushBuffer ();
|
|
|
|
MonoIOError error;
|
|
|
|
buf_start = MonoIO.Seek (safeHandle, pos, SeekOrigin.Begin, out error);
|
|
|
|
if (error != MonoIOError.ERROR_SUCCESS) {
|
|
// don't leak the path information for isolated storage
|
|
throw MonoIO.GetException (GetSecureFileName (name), error);
|
|
}
|
|
|
|
return(buf_start);
|
|
}
|
|
|
|
public override void SetLength (long value)
|
|
{
|
|
if (safeHandle.IsClosed)
|
|
throw new ObjectDisposedException ("Stream has been closed");
|
|
|
|
if(CanSeek == false)
|
|
throw new NotSupportedException("The stream does not support seeking");
|
|
|
|
if(CanWrite == false)
|
|
throw new NotSupportedException("The stream does not support writing");
|
|
|
|
if(value < 0)
|
|
throw new ArgumentOutOfRangeException("value is less than 0");
|
|
|
|
FlushBuffer ();
|
|
|
|
MonoIOError error;
|
|
|
|
MonoIO.SetLength (safeHandle, value, out error);
|
|
if (error != MonoIOError.ERROR_SUCCESS) {
|
|
// don't leak the path information for isolated storage
|
|
throw MonoIO.GetException (GetSecureFileName (name), error);
|
|
}
|
|
|
|
if (Position > value)
|
|
Position = value;
|
|
}
|
|
|
|
public override void Flush ()
|
|
{
|
|
if (safeHandle.IsClosed)
|
|
throw new ObjectDisposedException ("Stream has been closed");
|
|
|
|
FlushBuffer ();
|
|
}
|
|
|
|
public virtual void Flush (bool flushToDisk)
|
|
{
|
|
if (safeHandle.IsClosed)
|
|
throw new ObjectDisposedException ("Stream has been closed");
|
|
|
|
FlushBuffer ();
|
|
|
|
// This does the fsync
|
|
if (flushToDisk){
|
|
MonoIOError error;
|
|
MonoIO.Flush (safeHandle, out error);
|
|
}
|
|
}
|
|
|
|
public virtual void Lock (long position, long length)
|
|
{
|
|
if (safeHandle.IsClosed)
|
|
throw new ObjectDisposedException ("Stream has been closed");
|
|
if (position < 0) {
|
|
throw new ArgumentOutOfRangeException ("position must not be negative");
|
|
}
|
|
if (length < 0) {
|
|
throw new ArgumentOutOfRangeException ("length must not be negative");
|
|
}
|
|
|
|
MonoIOError error;
|
|
|
|
MonoIO.Lock (safeHandle, position, length, out error);
|
|
if (error != MonoIOError.ERROR_SUCCESS) {
|
|
// don't leak the path information for isolated storage
|
|
throw MonoIO.GetException (GetSecureFileName (name), error);
|
|
}
|
|
}
|
|
|
|
public virtual void Unlock (long position, long length)
|
|
{
|
|
if (safeHandle.IsClosed)
|
|
throw new ObjectDisposedException ("Stream has been closed");
|
|
if (position < 0) {
|
|
throw new ArgumentOutOfRangeException ("position must not be negative");
|
|
}
|
|
if (length < 0) {
|
|
throw new ArgumentOutOfRangeException ("length must not be negative");
|
|
}
|
|
|
|
MonoIOError error;
|
|
|
|
MonoIO.Unlock (safeHandle, position, length, out error);
|
|
if (error != MonoIOError.ERROR_SUCCESS) {
|
|
// don't leak the path information for isolated storage
|
|
throw MonoIO.GetException (GetSecureFileName (name), error);
|
|
}
|
|
}
|
|
|
|
// protected
|
|
|
|
~FileStream ()
|
|
{
|
|
Dispose (false);
|
|
}
|
|
|
|
protected override void Dispose (bool disposing)
|
|
{
|
|
Exception exc = null;
|
|
if (safeHandle != null && !safeHandle.IsClosed) {
|
|
try {
|
|
// If the FileStream is in "exposed" status
|
|
// it means that we do not have a buffer(we write the data without buffering)
|
|
// therefor we don't and can't flush the buffer becouse we don't have one.
|
|
FlushBuffer ();
|
|
} catch (Exception e) {
|
|
exc = e;
|
|
}
|
|
|
|
if (owner) {
|
|
MonoIOError error;
|
|
|
|
MonoIO.Close (safeHandle.DangerousGetHandle (), out error);
|
|
if (error != MonoIOError.ERROR_SUCCESS) {
|
|
// don't leak the path information for isolated storage
|
|
throw MonoIO.GetException (GetSecureFileName (name), error);
|
|
}
|
|
|
|
safeHandle.DangerousRelease ();
|
|
}
|
|
}
|
|
|
|
canseek = false;
|
|
access = 0;
|
|
|
|
if (disposing && buf != null) {
|
|
if (buf.Length == DefaultBufferSize && buf_recycle == null) {
|
|
lock (buf_recycle_lock) {
|
|
if (buf_recycle == null) {
|
|
buf_recycle = buf;
|
|
}
|
|
}
|
|
}
|
|
|
|
buf = null;
|
|
GC.SuppressFinalize (this);
|
|
}
|
|
if (exc != null)
|
|
throw exc;
|
|
}
|
|
|
|
#if !NET_2_1
|
|
public FileSecurity GetAccessControl ()
|
|
{
|
|
if (safeHandle.IsClosed)
|
|
throw new ObjectDisposedException ("Stream has been closed");
|
|
|
|
return new FileSecurity (SafeFileHandle,
|
|
AccessControlSections.Owner |
|
|
AccessControlSections.Group |
|
|
AccessControlSections.Access);
|
|
}
|
|
|
|
public void SetAccessControl (FileSecurity fileSecurity)
|
|
{
|
|
if (safeHandle.IsClosed)
|
|
throw new ObjectDisposedException ("Stream has been closed");
|
|
|
|
if (null == fileSecurity)
|
|
throw new ArgumentNullException ("fileSecurity");
|
|
|
|
fileSecurity.PersistModifications (SafeFileHandle);
|
|
}
|
|
#endif
|
|
|
|
public override Task FlushAsync (CancellationToken cancellationToken)
|
|
{
|
|
if (safeHandle.IsClosed)
|
|
throw new ObjectDisposedException ("Stream has been closed");
|
|
|
|
return base.FlushAsync (cancellationToken);
|
|
}
|
|
|
|
public override Task<int> ReadAsync (byte[] buffer, int offset, int count, CancellationToken cancellationToken)
|
|
{
|
|
return base.ReadAsync (buffer, offset, count, cancellationToken);
|
|
}
|
|
|
|
public override Task WriteAsync (byte[] buffer, int offset, int count, CancellationToken cancellationToken)
|
|
{
|
|
return base.WriteAsync (buffer, offset, count, cancellationToken);
|
|
}
|
|
|
|
// private.
|
|
|
|
// ReadSegment, WriteSegment, FlushBuffer,
|
|
// RefillBuffer and ReadData should only be called
|
|
// when the Monitor lock is held, but these methods
|
|
// grab it again just to be safe.
|
|
|
|
private int ReadSegment (byte [] dest, int dest_offset, int count)
|
|
{
|
|
count = Math.Min (count, buf_length - buf_offset);
|
|
|
|
if (count > 0) {
|
|
// Use the fastest method, all range checks has been done
|
|
Buffer.InternalBlockCopy (buf, buf_offset, dest, dest_offset, count);
|
|
buf_offset += count;
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
private int WriteSegment (byte [] src, int src_offset,
|
|
int count)
|
|
{
|
|
if (count > buf_size - buf_offset) {
|
|
count = buf_size - buf_offset;
|
|
}
|
|
|
|
if (count > 0) {
|
|
Buffer.BlockCopy (src, src_offset,
|
|
buf, buf_offset,
|
|
count);
|
|
buf_offset += count;
|
|
if (buf_offset > buf_length) {
|
|
buf_length = buf_offset;
|
|
}
|
|
|
|
buf_dirty = true;
|
|
}
|
|
|
|
return(count);
|
|
}
|
|
|
|
void FlushBuffer ()
|
|
{
|
|
if (buf_dirty) {
|
|
// if (st == null) {
|
|
MonoIOError error;
|
|
|
|
if (CanSeek == true && !isExposed) {
|
|
MonoIO.Seek (safeHandle, buf_start, SeekOrigin.Begin, out error);
|
|
|
|
if (error != MonoIOError.ERROR_SUCCESS) {
|
|
// don't leak the path information for isolated storage
|
|
throw MonoIO.GetException (GetSecureFileName (name), error);
|
|
}
|
|
}
|
|
|
|
int wcount = buf_length;
|
|
int offset = 0;
|
|
while (wcount > 0){
|
|
int n = MonoIO.Write (safeHandle, buf, 0, buf_length, out error);
|
|
if (error != MonoIOError.ERROR_SUCCESS) {
|
|
// don't leak the path information for isolated storage
|
|
throw MonoIO.GetException (GetSecureFileName (name), error);
|
|
}
|
|
wcount -= n;
|
|
offset += n;
|
|
}
|
|
// } else {
|
|
// st.Write (buf, 0, buf_length);
|
|
// }
|
|
}
|
|
|
|
buf_start += buf_offset;
|
|
buf_offset = buf_length = 0;
|
|
buf_dirty = false;
|
|
}
|
|
|
|
private void FlushBufferIfDirty ()
|
|
{
|
|
if (buf_dirty)
|
|
FlushBuffer ();
|
|
}
|
|
|
|
private void RefillBuffer ()
|
|
{
|
|
FlushBuffer ();
|
|
|
|
buf_length = ReadData (safeHandle, buf, 0, buf_size);
|
|
}
|
|
|
|
private int ReadData (SafeHandle safeHandle, byte[] buf, int offset,
|
|
int count)
|
|
{
|
|
MonoIOError error;
|
|
int amount = 0;
|
|
|
|
/* when async == true, if we get here we don't suport AIO or it's disabled
|
|
* and we're using the threadpool */
|
|
amount = MonoIO.Read (safeHandle, buf, offset, count, out error);
|
|
if (error == MonoIOError.ERROR_BROKEN_PIPE) {
|
|
amount = 0; // might not be needed, but well...
|
|
} else if (error != MonoIOError.ERROR_SUCCESS) {
|
|
// don't leak the path information for isolated storage
|
|
throw MonoIO.GetException (GetSecureFileName (name), error);
|
|
}
|
|
|
|
/* Check for read error */
|
|
if(amount == -1) {
|
|
throw new IOException ();
|
|
}
|
|
|
|
return(amount);
|
|
}
|
|
|
|
void InitBuffer (int size, bool isZeroSize)
|
|
{
|
|
if (isZeroSize) {
|
|
size = 0;
|
|
buf = new byte[1];
|
|
} else {
|
|
if (size <= 0)
|
|
throw new ArgumentOutOfRangeException ("bufferSize", "Positive number required.");
|
|
|
|
size = Math.Max (size, 8);
|
|
|
|
//
|
|
// Instead of allocating a new default buffer use the
|
|
// last one if there is any available
|
|
//
|
|
if (size <= DefaultBufferSize && buf_recycle != null) {
|
|
lock (buf_recycle_lock) {
|
|
if (buf_recycle != null) {
|
|
buf = buf_recycle;
|
|
buf_recycle = null;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (buf == null)
|
|
buf = new byte [size];
|
|
else
|
|
Array.Clear (buf, 0, size);
|
|
}
|
|
|
|
buf_size = size;
|
|
// buf_start = 0;
|
|
// buf_offset = buf_length = 0;
|
|
// buf_dirty = false;
|
|
}
|
|
|
|
private string GetSecureFileName (string filename)
|
|
{
|
|
return (anonymous) ? Path.GetFileName (filename) : Path.GetFullPath (filename);
|
|
}
|
|
|
|
private string GetSecureFileName (string filename, bool full)
|
|
{
|
|
return (anonymous) ? Path.GetFileName (filename) :
|
|
(full) ? Path.GetFullPath (filename) : filename;
|
|
}
|
|
|
|
// fields
|
|
|
|
internal const int DefaultBufferSize = 4096;
|
|
|
|
// Input buffer ready for recycling
|
|
static byte[] buf_recycle;
|
|
static readonly object buf_recycle_lock = new object ();
|
|
|
|
private byte [] buf; // the buffer
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private string name = "[Unknown]"; // name of file.
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private SafeFileHandle safeHandle;
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private bool isExposed;
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private long append_startpos;
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private FileAccess access;
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private bool owner;
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private bool async;
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private bool canseek;
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private bool anonymous;
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private bool buf_dirty; // true if buffer has been written to
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private int buf_size; // capacity in bytes
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private int buf_length; // number of valid bytes in buffer
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private int buf_offset; // position of next byte
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private long buf_start; // location of buffer in file
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}
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}
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