Exception on using Vte

[Thomas Martitz]

The following code throws an exception, even though I think the code ought to be fine. Can you guide me what's wrong here? Does it have something to do with the fact that vte_terminal_feed() is passed a const gchar * that's meant to hold binary data (not a nul terminated string) plus a separate length parameter?

require 'gir_ffi-gtk3'

Gtk.init


GObjectIntrospection::IRepository.default.require("Vte", "2.91")
GirFFI.setup(:Vte, '2.91')

vte = Vte::Terminal.new

win = Gtk::Window.new(:toplevel)
win.add(vte)
win.show_all

vte.feed("foo")

Gtk.main

=>

/usr/lib/ruby/gems/2.3.0/gems/gir_ffi-0.11.0/lib/gir_ffi/in_pointer.rb:108:in `put_array_of_uint8': Memory access offset=0 size=5205862 is out of bounds (IndexError)
    from /usr/lib/ruby/gems/2.3.0/gems/gir_ffi-0.11.0/lib/gir_ffi/in_pointer.rb:108:in `block in from_basic_type_array'
    from /usr/lib/ruby/gems/2.3.0/gems/gir_ffi-0.11.0/lib/gir_ffi/in_pointer.rb:106:in `tap'
    from /usr/lib/ruby/gems/2.3.0/gems/gir_ffi-0.11.0/lib/gir_ffi/in_pointer.rb:106:in `from_basic_type_array'
    from /usr/lib/ruby/gems/2.3.0/gems/gir_ffi-0.11.0/lib/gir_ffi/in_pointer.rb:15:in `from_array'
    from /usr/lib/ruby/gems/2.3.0/gems/gir_ffi-0.11.0/lib/gir_ffi/sized_array.rb:104:in `from_enumerable'
    from /usr/lib/ruby/gems/2.3.0/gems/gir_ffi-0.11.0/lib/gir_ffi/sized_array.rb:70:in `from'
    from (eval):4:in `feed'
    from /usr/lib/ruby/gems/2.3.0/gems/gir_ffi-0.11.0/lib/gir_ffi/class_base.rb:25:in `setup_and_call'
    from (eval):2:in `feed'
    from /tmp/test.rb:15:in `<main>'

Here's the gir for vte_terminal_feed():

     <method name="feed" c:identifier="vte_terminal_feed">
        <doc xml:space="preserve">Interprets @data as if it were data received from a child process.  This
can either be used to drive the terminal without a child process, or just
to mess with your users.</doc>
        <return-value transfer-ownership="none">
          <type name="none" c:type="void"/>
        </return-value>
        <parameters>
          <instance-parameter name="terminal" transfer-ownership="none">
            <doc xml:space="preserve">a #VteTerminal</doc>
            <type name="Terminal" c:type="VteTerminal*"/>
          </instance-parameter>
          <parameter name="data"
                     transfer-ownership="none"
                     nullable="1"
                     allow-none="1">
            <doc xml:space="preserve">a string in the terminal's current encoding</doc>
            <array length="1" zero-terminated="0" c:type="char*">
              <type name="guint8"/>
            </array>
          </parameter>
          <parameter name="length" transfer-ownership="none">
            <doc xml:space="preserve">the length of the string, or -1 to use the full length or a nul-terminated string</doc>
            <type name="gssize" c:type="gssize"/>
          </parameter>
        </parameters>
      </method>