mcs/class/corlib/System.IO.IsolatedStorage/MoonIsolatedStorageFileStream.cs

   1 //
   2 // System.IO.IsolatedStorage.MoonIsolatedStorageFileStream
   3 //
   4 // Moonlight's implementation for the IsolatedStorageFileStream
   5 //
   6 // Authors
   7 //      Miguel de Icaza (miguel@novell.com)
   8 //
   9 // Copyright (C) 2007, 2008 Novell, Inc (http://www.novell.com)
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30 #if NET_2_1
  31 using System;
  32 using System.IO;
  33
  34 namespace System.IO.IsolatedStorage {
  35
  36         // NOTES:
  37         // * Silverlight allows extending to more than AvailableFreeSpace (by up to 1024 bytes).
  38         //   This looks like a safety buffer.
  39
  40         [MonoTODO ("this needs to be quota-enabled")]
  41         public class IsolatedStorageFileStream : FileStream {
  42
  43                 IsolatedStorageFile container;
  44
  45                 internal static string Verify (IsolatedStorageFile isf, string path)
  46                 {
  47                         if (path == null)
  48                                 throw new ArgumentNullException ("path");
  49                         if (path.Length == 0)
  50                                 throw new ArgumentException ("path");
  51                         if (isf == null)
  52                                 throw new ArgumentNullException ("isf");
  53
  54                         isf.PreCheck ();
  55                         return isf.Verify (path);
  56                 }
  57
  58                 public IsolatedStorageFileStream (string path, FileMode mode, IsolatedStorageFile isf)
  59                         : base (Verify (isf, path), mode, (mode == FileMode.Append ? FileAccess.Write : FileAccess.ReadWrite),
  60                                 FileShare.Read, DefaultBufferSize, false, true)
  61                 {
  62                         container = isf;
  63                 }
  64
  65                 public IsolatedStorageFileStream (string path, FileMode mode, FileAccess access, IsolatedStorageFile isf)
  66                         : base (Verify (isf, path), mode, access, FileShare.Read, DefaultBufferSize, false, true)
  67                 {
  68                         container = isf;
  69                 }
  70
  71                 public IsolatedStorageFileStream (string path, FileMode mode, FileAccess access, FileShare share, IsolatedStorageFile isf)
  72                         : base (Verify (isf, path), mode, access, share, DefaultBufferSize, false, true)
  73                 {
  74                         container = isf;
  75                 }
  76
  77                 protected override void Dispose (bool disposing)
  78                 {
  79                         // no PreCheck required
  80                         base.Dispose (disposing);
  81                 }
  82
  83                 public override void Flush ()
  84                 {
  85                         container.PreCheck ();
  86                         base.Flush ();
  87                 }
  88
  89                 public override int Read (byte [] buffer, int offset, int count)
  90                 {
  91                         container.PreCheck ();
  92                         return base.Read (buffer, offset, count);
  93                 }
  94
  95                 public override int ReadByte ()
  96                 {
  97                         container.PreCheck ();
  98                         return base.ReadByte ();
  99                 }
 100
 101                 public override long Seek (long offset, SeekOrigin origin)
 102                 {
 103                         container.PreCheck ();
 104                         return base.Seek (offset, origin);
 105                 }
 106
 107                 public override void SetLength (long value)
 108                 {
 109                         container.PreCheck ();
 110                         // if we're getting bigger then we must ensure we fit in the available free space of our container
 111                         if (!container.CanExtend (value - Length))
 112                                 throw new IsolatedStorageException ();
 113
 114                         base.SetLength (value);
 115                 }
 116
 117                 public override void Write (byte [] buffer, int offset, int count)
 118                 {
 119                         container.PreCheck ();
 120                         // FIXME: check quota, if we grow the file
 121                         base.Write (buffer, offset, count);
 122                 }
 123
 124                 public override void WriteByte (byte value)
 125                 {
 126                         container.PreCheck ();
 127                         // if we are in position to grow the file make sure we can extend it by one byte
 128                         if ((Position == Length) && !container.CanExtend (1))
 129                                 throw new IsolatedStorageException ();
 130                         base.WriteByte (value);
 131                 }
 132
 133                 public override bool CanRead {
 134                         get {
 135                                 // no PreCheck required
 136                                 return base.CanRead;
 137                         }
 138                 }
 139
 140                 public override bool CanSeek {
 141                         get {
 142                                 // no PreCheck required
 143                                 return base.CanSeek;
 144                         }
 145                 }
 146
 147                 public override bool CanWrite {
 148                         get {
 149                                 // no PreCheck required
 150                                 return base.CanWrite;
 151                         }
 152                 }
 153
 154                 public override long Length {
 155                         get {
 156                                 container.PreCheck ();
 157                                 return base.Length;
 158                         }
 159                 }
 160
 161                 public override long Position {
 162                         get {
 163                                 container.PreCheck ();
 164                                 return base.Position;
 165                         }
 166                         set {
 167                                 container.PreCheck ();
 168                                 base.Position = value;
 169                         }
 170                 }
 171
 172                 public override IAsyncResult BeginRead (byte[] buffer, int offset, int numBytes, AsyncCallback userCallback, object stateObject)
 173                 {
 174                         container.PreCheck ();
 175                         return base.BeginRead (buffer, offset, numBytes, userCallback, stateObject);
 176                 }
 177
 178                 public override IAsyncResult BeginWrite (byte[] buffer, int offset, int numBytes, AsyncCallback userCallback, object stateObject)
 179                 {
 180                         container.PreCheck ();
 181                         // FIXME: check quota, if we grow the file
 182                         return base.BeginWrite (buffer, offset, numBytes, userCallback, stateObject);
 183                 }
 184
 185                 public override int EndRead (IAsyncResult asyncResult)
 186                 {
 187                         return base.EndRead (asyncResult);
 188                 }
 189
 190                 public override void EndWrite (IAsyncResult asyncResult)
 191                 {
 192                         base.EndWrite (asyncResult);
 193                 }
 194         }
 195 }
 196 #endif