public static IObservable <string> ReadLineAsync(this Stream stream, Encoding encoding, int chunkSize = 65536)
{
return(ObservableForCompatible.Create <string>(observer =>
{
var decoder = encoding.GetDecoder();
var bom = encoding.GetChars(encoding.GetPreamble()).FirstOrDefault();
var sb = new StringBuilder();
var prev = default(char);
return stream.ReadAsync(chunkSize)
.SelectMany(bytes =>
{
var charBuffer = new char[encoding.GetMaxCharCount(bytes.Length)];
var count = decoder.GetChars(bytes, 0, bytes.Length, charBuffer, 0);
return charBuffer.Take(count);
})
.Subscribe(
c =>
{
if (c == bom)
{
} // skip bom
else if (prev == '\r' && c == '\n')
{
} // when \r\n do nothing
else if (c == '\r' || c == '\n') // reach at EndOfLine
{
var str = sb.ToString();
sb.Length = 0;
observer.OnNext(str);
}
else
{
sb.Append(c); // normally char
}
prev = c;
},
observer.OnError,
() =>
{
var str = sb.ToString();
if (str != "")
{
observer.OnNext(str);
}
observer.OnCompleted();
});
}));
}
public static IObservable <Stream> GetRequestStreamAsObservable(this WebRequest request)
{
return(ObservableForCompatible.Create <Stream>(observer =>
{
var disposable = new BooleanDisposable();
Observable.FromAsyncPattern <Stream>(request.BeginGetRequestStream, ar =>
{
var res = request.EndGetRequestStream(ar);
if (disposable.IsDisposed)
{
res.Close();
}
return res;
})().Subscribe(observer);
return disposable;
}));
}
