GtkSharp/Source/Libs/GioSharp/GioStream.cs

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/*
* 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 ISeekable && (stream as ISeekable).CanSeek;
}
public GioStream (OutputStream stream)
{
this.stream = stream;
can_write = true;
can_seek = stream is ISeekable && (stream as ISeekable).CanSeek;
}
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public GioStream (IOStream stream)
{
this.stream = stream;
can_read = true;
can_write = true;
can_seek = stream is ISeekable && (stream as ISeekable).CanSeek;
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}
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;
}
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if (stream is FileIOStream) {
FileInfo info = (stream as FileIOStream).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 ISeekable).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");
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InputStream input_stream = null;
if (stream is InputStream)
input_stream = stream as InputStream;
else if (stream is IOStream)
input_stream = (stream as IOStream).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");
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OutputStream output_stream = null;
if (stream is OutputStream)
output_stream = stream as OutputStream;
else if (stream is IOStream)
output_stream = (stream as IOStream).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");
var seekable = stream as ISeekable;
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");
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var seekable = stream as ISeekable;
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if (!seekable.CanTruncate ())
throw new NotSupportedException ("This stream doesn't support truncating");
if (is_disposed)
throw new ObjectDisposedException ("The stream is closed");
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seekable.Truncate (value, null);
}
public override void Close ()
{
if (stream is InputStream)
(stream as InputStream).Close (null);
if (stream is OutputStream)
(stream as OutputStream).Close (null);
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if (stream is IOStream)
(stream as IOStream).Close (null);
is_disposed = true;
}
}
}