Exception in StreamSync readHeaderPackage and readUpdate

[Martin-Schultz]

Stream.Read(buffer, offset, count) does not guarantee to read "count" bytes. The return value has to be used to make sure all bytes were received. If bytes are received fragmented (e.g. on a bad connection) the StreamSync class breaks.

see:
https://msdn.microsoft.com/en-us/library/system.io.stream.read(v=vs.110).aspx