2007-10-21  Behdad Esfahbod  <behdad@gnome.org>

        Bug 488840 – harfbuzz: protect against ligid overflow

        * pango/opentype/harfbuzz-buffer.c (_hb_buffer_allocate_ligid):
        Never return zero, even in case of overflow.

        * pango/opentype/harfbuzz-impl.h: Define dummy HB_LIKELY() and
        HB_UNLIKELY(), to be filled later.