Function xmlSwitchToEncoding 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn xmlSwitchToEncoding(
    ctxt: *mut _xmlParserCtxt,
    handler: *mut _xmlCharEncodingHandler,
) -> c_int

Switch the encoding of the current input using an encoding handler.

UPSTREAM-PARITY

int xmlSwitchToEncoding(xmlParserCtxtPtr ctxt,
                        xmlCharEncodingHandlerPtr handler);