Roll harfbuzz-ng to 1.0.5

third_party/harfbuzz-ng/src/hb-shape-plan.cc

 /*
  * Copyright © 2012  Google, Inc.
  *
  *  This is part of HarfBuzz, a text shaping library.
  *
  * Permission is hereby granted, without written agreement and without
  * license or royalty fees, to use, copy, modify, and distribute this
  * software and its documentation for any purpose, provided that the
  * above copyright notice and the following two paragraphs appear in
  * all copies of this software.
@@ skipping 110 matching lines @@
                   num_user_features,
                   shaper_list);
 
   hb_shape_plan_t *shape_plan;
   hb_feature_t *features = NULL;
 
   if (unlikely (!face))
     face = hb_face_get_empty ();
   if (unlikely (!props))
     return hb_shape_plan_get_empty ();
-  if (num_user_features && !(features = (hb_feature_t *) malloc (num_user_features * sizeof (hb_feature_t))))
+  if (num_user_features && !(features = (hb_feature_t *) calloc (num_user_features, sizeof (hb_feature_t))))
     return hb_shape_plan_get_empty ();
   if (!(shape_plan = hb_object_create<hb_shape_plan_t> ())) {
     free (features);
     return hb_shape_plan_get_empty ();
   }
 
   assert (props->direction != HB_DIRECTION_INVALID);
 
   hb_face_make_immutable (face);
   shape_plan->default_shaper_list = shaper_list == NULL;
@@ skipping 144 matching lines @@
                        hb_font_t          *font,
                        hb_buffer_t        *buffer,
                        const hb_feature_t *features,
                        unsigned int        num_features)
 {
   DEBUG_MSG_FUNC (SHAPE_PLAN, shape_plan,
                   "num_features=%d shaper_func=%p",
                   num_features,
                   shape_plan->shaper_func);
 
-  if (unlikely (hb_object_is_inert (shape_plan) ||
-                hb_object_is_inert (buffer)))
+  if (unlikely (!buffer->len))
+    return true;
+
+  assert (!hb_object_is_inert (buffer));
+  assert (buffer->content_type == HB_BUFFER_CONTENT_TYPE_UNICODE);
+
+  if (unlikely (hb_object_is_inert (shape_plan)))
     return false;
 
   assert (shape_plan->face_unsafe == font->face);
   assert (hb_segment_properties_equal (&shape_plan->props, &buffer->props));
 
 #define HB_SHAPER_EXECUTE(shaper) \
         HB_STMT_START { \
           return HB_SHAPER_DATA (shaper, shape_plan) && \
                  hb_##shaper##_shaper_font_data_ensure (font) && \
                  _hb_##shaper##_shape (shape_plan, font, buffer, features, num_features); \
@@ skipping 178 matching lines @@
  *
  * Return value: (transfer none):
  *
  * Since: 0.9.7
  **/
 const char *
 hb_shape_plan_get_shaper (hb_shape_plan_t *shape_plan)
 {
   return shape_plan->shaper_name;
 }