ArgumentOutOfRangeException when reading ssl streams in SslFilter

[longshine]

Problem

In certain occasion, an uncaught ArgumentOutOfRangeException may be thrown in method SslHandler.ReadBuffer().

This is caused by an invalid count argument when calling SslStream.Read(byte[] buffer, int offset, int count). To avoid overflow, it should be buf.Remaining, not buf.Capacity.

Besides, the capacity of buf is incorrectly enlarged.

Related with #15.

Solution

Fixes the incorrect count and capacity while reading from a SslStream, and do not write empty buffer into a SslStream.
Commit 5d6fcbd fixed this issue.

Backward compatibility

No backward compatibility problems are expected.

Contributor

@ddfczm