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GioStream.cs

/*
 * GioStream.cs: provide a System.IO.Stream api to [Input|Output]Streams
 *
 * Author(s):
 *    Stephane Delcroix  (stephane@delcroix.org)
 *
 * Copyright (c) 2008 Novell, Inc.
 *
 * 
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 * 
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */
using System;

namespace GLib
{
      public class GioStream : System.IO.Stream
      {
            object stream;
            bool can_read;
            bool can_seek;
            bool can_write;
            bool is_disposed;

            public GioStream (Uri uri, System.IO.FileMode mode)
            {
                  throw new NotImplementedException ();
            }

            public GioStream (string filename, System.IO.FileMode mode)
            {
                  throw new NotImplementedException ();
            }

            public GioStream (InputStream stream)
            {
                  this.stream = stream;
                  can_read = true;
                  can_seek = stream is Seekable && (stream as Seekable).CanSeek;
            }

            public GioStream (OutputStream stream)
            {
                  this.stream = stream;
                  can_write = true;
                  can_seek = stream is Seekable && (stream as Seekable).CanSeek;
            }

            public override bool CanSeek {
                  get { return can_seek; }
            }

            public override bool CanRead {
                  get { return can_read; }
            }

            public override bool CanWrite {
                  get { return can_write; }
            }

            public override long Length {
                  get {
                        if (!CanSeek)
                              throw new NotSupportedException ("This stream doesn't support seeking");
                        if (is_disposed)
                              throw new ObjectDisposedException ("The stream is closed");
                        
                        if (stream is FileInputStream) {
                              FileInfo info = (stream as FileInputStream).QueryInfo ("standard::size", null);
                              return info.Size;
                        }
                        if (stream is FileOutputStream) {
                              FileInfo info = (stream as FileOutputStream).QueryInfo ("standard::size", null);
                              return info.Size;
                        }
                        throw new NotImplementedException (String.Format ("not implemented for {0} streams", stream.GetType()));
                  }
            }

            public override long Position {
                  get {
                        if (!CanSeek)
                              throw new NotSupportedException ("This stream doesn't support seeking");
                        if (is_disposed)
                              throw new ObjectDisposedException ("The stream is closed");
                        return (stream as Seekable).Position;
                  }
                  set {
                        Seek (value, System.IO.SeekOrigin.Begin);
                  }
            }

            public override void Flush ()
            {
                  if (is_disposed)
                        throw new ObjectDisposedException ("The stream is closed"); 
            }

            public override int Read (byte[] buffer, int offset, int count)
            {
                  if (buffer == null)
                        throw new ArgumentNullException ("buffer");
                  if (offset + count - 1 > buffer.Length)
                        throw new ArgumentException ("(offset + count - 1) is greater than the length of buffer");
                  if (offset < 0)
                        throw new ArgumentOutOfRangeException ("offset");
                  if (count < 0)
                        throw new ArgumentOutOfRangeException ("count");
                  if (!CanRead)
                        throw new NotSupportedException ("The stream does not support reading");
                  if (is_disposed)
                        throw new ObjectDisposedException ("The stream is closed");
                  InputStream input_stream = stream as InputStream;
                  if (input_stream == null)
                        throw new System.Exception ("this shouldn't happen");

                  if (offset == 0)
                        return (int)input_stream.Read (buffer, (ulong)count, null);
                  else {
                        byte[] buf = new byte[count];
                        int ret = (int)input_stream.Read (buf, (ulong)count, null);
                        buf.CopyTo (buffer, offset);
                        return ret;
                  }
            }

            public override void Write (byte[] buffer, int offset, int count)
            {
                  if (buffer == null)
                        throw new ArgumentNullException ("buffer");
                  if (offset + count  > buffer.Length)
                        throw new ArgumentException ("(offset + count) is greater than the length of buffer");
                  if (offset < 0)
                        throw new ArgumentOutOfRangeException ("offset");
                  if (count < 0)
                        throw new ArgumentOutOfRangeException ("count");
                  if (!CanWrite)
                        throw new NotSupportedException ("The stream does not support writing");
                  if (is_disposed)
                        throw new ObjectDisposedException ("The stream is closed");
                  OutputStream output_stream = stream as OutputStream;
                  if (output_stream == null)
                        throw new System.Exception ("this shouldn't happen");
                  if (offset == 0) {
                        output_stream.Write (buffer, (ulong)count, null);
                        return;
                  } else {
                        byte[] buf = new byte[count];
                        Array.Copy (buffer, offset, buf, 0, count);
                        output_stream.Write (buf, (ulong)count, null);
                        return;
                  }
            }

            public override long Seek (long offset, System.IO.SeekOrigin origin)
            {
                  if (!CanSeek)
                        throw new NotSupportedException ("This stream doesn't support seeking");
                  if (is_disposed)
                        throw new ObjectDisposedException ("The stream is closed");
                  Seekable seekable = stream as Seekable;

                  SeekType seek_type;
                  switch (origin) {
                  case System.IO.SeekOrigin.Current:
                        seek_type = SeekType.Cur;
                        break;
                  case System.IO.SeekOrigin.End:
                        seek_type = SeekType.End;
                        break;
                  case System.IO.SeekOrigin.Begin:
                  default:
                        seek_type = SeekType.Set;
                        break;
                  }
                  seekable.Seek (offset, seek_type, null);
                  return Position;
            }

            public override void SetLength (long value)
            {
                  if (!CanSeek || !CanWrite)
                        throw new NotSupportedException ("This stream doesn't support seeking");
                  if (is_disposed)
                        throw new ObjectDisposedException ("The stream is closed");
                  throw new NotImplementedException ();
            }

            public override void Close ()
            {
                  if (stream is InputStream)
                        (stream as InputStream).Close (null);
                  if (stream is OutputStream)
                        (stream as OutputStream).Close (null);
                  is_disposed = true;
            }
      }
}

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