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using System;
using System.IO;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using MediaBrowser.Model.IO;
using MediaBrowser.Model.Text;
using SocketHttpListener.Primitives;
namespace SocketHttpListener.Net
{
// FIXME: Does this buffer the response until Close?
// Update: we send a single packet for the first non-chunked Write
// What happens when we set content-length to X and write X-1 bytes then close?
// what if we don't set content-length at all?
public class ResponseStream : Stream
{
HttpListenerResponse response;
bool disposed;
bool trailer_sent;
Stream stream;
private readonly IMemoryStreamFactory _memoryStreamFactory;
private readonly ITextEncoding _textEncoding;
internal ResponseStream(Stream stream, HttpListenerResponse response, IMemoryStreamFactory memoryStreamFactory, ITextEncoding textEncoding)
{
this.response = response;
_memoryStreamFactory = memoryStreamFactory;
_textEncoding = textEncoding;
this.stream = stream;
}
public override bool CanRead
{
get { return false; }
}
public override bool CanSeek
{
get { return false; }
}
public override bool CanWrite
{
get { return true; }
}
public override long Length
{
get { throw new NotSupportedException(); }
}
public override long Position
{
get { throw new NotSupportedException(); }
set { throw new NotSupportedException(); }
}
protected override void Dispose(bool disposing)
{
if (disposed == false)
{
disposed = true;
byte[] bytes = null;
MemoryStream ms = GetHeaders(response, _memoryStreamFactory, false);
bool chunked = response.SendChunked;
if (stream.CanWrite)
{
try
{
if (ms != null)
{
long start = ms.Position;
if (chunked && !trailer_sent)
{
bytes = GetChunkSizeBytes(0, true);
ms.Position = ms.Length;
ms.Write(bytes, 0, bytes.Length);
}
byte[] msBuffer;
_memoryStreamFactory.TryGetBuffer(ms, out msBuffer);
InternalWrite(msBuffer, (int)start, (int)(ms.Length - start));
trailer_sent = true;
}
else if (chunked && !trailer_sent)
{
bytes = GetChunkSizeBytes(0, true);
InternalWrite(bytes, 0, bytes.Length);
trailer_sent = true;
}
}
catch (IOException ex)
{
// Ignore error due to connection reset by peer
}
}
response.Close();
}
base.Dispose(disposing);
}
internal static MemoryStream GetHeaders(HttpListenerResponse response, IMemoryStreamFactory memoryStreamFactory, bool closing)
{
// SendHeaders works on shared headers
lock (response.headers_lock)
{
if (response.HeadersSent)
return null;
MemoryStream ms = memoryStreamFactory.CreateNew();
response.SendHeaders(closing, ms);
return ms;
}
}
public override void Flush()
{
}
static byte[] crlf = new byte[] { 13, 10 };
byte[] GetChunkSizeBytes(int size, bool final)
{
string str = String.Format("{0:x}\r\n{1}", size, final ? "\r\n" : "");
return _textEncoding.GetASCIIEncoding().GetBytes(str);
}
internal void InternalWrite(byte[] buffer, int offset, int count)
{
stream.Write(buffer, offset, count);
}
public override void Write(byte[] buffer, int offset, int count)
{
if (disposed)
throw new ObjectDisposedException(GetType().ToString());
byte[] bytes = null;
MemoryStream ms = GetHeaders(response, _memoryStreamFactory, false);
bool chunked = response.SendChunked;
if (ms != null)
{
long start = ms.Position; // After the possible preamble for the encoding
ms.Position = ms.Length;
if (chunked)
{
bytes = GetChunkSizeBytes(count, false);
ms.Write(bytes, 0, bytes.Length);
}
int new_count = Math.Min(count, 16384 - (int)ms.Position + (int)start);
ms.Write(buffer, offset, new_count);
count -= new_count;
offset += new_count;
byte[] msBuffer;
_memoryStreamFactory.TryGetBuffer(ms, out msBuffer);
InternalWrite(msBuffer, (int)start, (int)(ms.Length - start));
ms.SetLength(0);
ms.Capacity = 0; // 'dispose' the buffer in ms.
}
else if (chunked)
{
bytes = GetChunkSizeBytes(count, false);
InternalWrite(bytes, 0, bytes.Length);
}
if (count > 0)
InternalWrite(buffer, offset, count);
if (chunked)
InternalWrite(crlf, 0, 2);
}
public override async Task WriteAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
{
if (disposed)
throw new ObjectDisposedException(GetType().ToString());
byte[] bytes = null;
MemoryStream ms = GetHeaders(response, _memoryStreamFactory, false);
bool chunked = response.SendChunked;
if (ms != null)
{
long start = ms.Position;
ms.Position = ms.Length;
if (chunked)
{
bytes = GetChunkSizeBytes(count, false);
ms.Write(bytes, 0, bytes.Length);
}
ms.Write(buffer, offset, count);
byte[] msBuffer;
_memoryStreamFactory.TryGetBuffer(ms, out msBuffer);
buffer = msBuffer;
offset = (int)start;
count = (int)(ms.Position - start);
}
else if (chunked)
{
bytes = GetChunkSizeBytes(count, false);
InternalWrite(bytes, 0, bytes.Length);
}
if (count > 0)
{
await stream.WriteAsync(buffer, offset, count, cancellationToken).ConfigureAwait(false);
}
if (response.SendChunked)
stream.Write(crlf, 0, 2);
}
//public override IAsyncResult BeginWrite(byte[] buffer, int offset, int count,
// AsyncCallback cback, object state)
//{
// if (disposed)
// throw new ObjectDisposedException(GetType().ToString());
// byte[] bytes = null;
// MemoryStream ms = GetHeaders(false);
// bool chunked = response.SendChunked;
// if (ms != null)
// {
// long start = ms.Position;
// ms.Position = ms.Length;
// if (chunked)
// {
// bytes = GetChunkSizeBytes(count, false);
// ms.Write(bytes, 0, bytes.Length);
// }
// ms.Write(buffer, offset, count);
// buffer = ms.ToArray();
// offset = (int)start;
// count = (int)(ms.Position - start);
// }
// else if (chunked)
// {
// bytes = GetChunkSizeBytes(count, false);
// InternalWrite(bytes, 0, bytes.Length);
// }
// return stream.BeginWrite(buffer, offset, count, cback, state);
//}
//public override void EndWrite(IAsyncResult ares)
//{
// if (disposed)
// throw new ObjectDisposedException(GetType().ToString());
// if (ignore_errors)
// {
// try
// {
// stream.EndWrite(ares);
// if (response.SendChunked)
// stream.Write(crlf, 0, 2);
// }
// catch { }
// }
// else {
// stream.EndWrite(ares);
// if (response.SendChunked)
// stream.Write(crlf, 0, 2);
// }
//}
public override int Read([In, Out] byte[] buffer, int offset, int count)
{
throw new NotSupportedException();
}
//public override IAsyncResult BeginRead(byte[] buffer, int offset, int count,
// AsyncCallback cback, object state)
//{
// throw new NotSupportedException();
//}
//public override int EndRead(IAsyncResult ares)
//{
// throw new NotSupportedException();
//}
public override long Seek(long offset, SeekOrigin origin)
{
throw new NotSupportedException();
}
public override void SetLength(long value)
{
throw new NotSupportedException();
}
}
}
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