Prevent endless loop if input is not compressible. May be fixed in 4.56 beta
--- CPP/7zip/Common/OutBuffer.cpp
+++ CPP/7zip/Common/OutBuffer.cpp
@@ -77,6 +77,8 @@
     UInt32 processedSize = 0;
     result = _stream->Write(_buffer + _streamPos, size, &processedSize);
     size = processedSize;
+    if (!size)
+      result = -1;
   }
   _streamPos += size;
   if (_streamPos == _bufferSize)