nsIIOUtil provdes various xpcom/io-related utility methods.
Test whether an input stream is buffered. See nsStreamUtils.h
documentation for NS_InputStreamIsBuffered for the definition of
“buffered” used here and for edge-case behavior.
@throws NS_ERROR_INVALID_POINTER if null is passed in.
Test whether an output stream is buffered. See nsStreamUtils.h
documentation for NS_OutputStreamIsBuffered for the definition of
“buffered” used here and for edge-case behavior.
@throws NS_ERROR_INVALID_POINTER if null is passed in.