def parse_from_environ(self, environ: WSGIEnvironment) -> t_parse_result:
        """Parses the information from the environment as form data.

        :param environ: the WSGI environment to be used for parsing.
        :return: A tuple in the form ``(stream, form, files)``.
        """
        stream = get_input_stream(environ, max_content_length=self.max_content_length)
        content_length = get_content_length(environ)
        mimetype, options = parse_options_header(environ.get("CONTENT_TYPE"))
        return self.parse(
            stream,
            content_length=content_length,
            mimetype=mimetype,
            options=options,
        )
Parses the information from the environment as form data.

        :param environ: the WSGI environment to be used for parsing.
        :return: A tuple in the form ``(stream, form, files)``.
        
src/werkzeug/formparser.py