Roll HarfBuzz to 1.2.1

third_party/harfbuzz-ng/src/hb-blob.cc

 /*
  * Copyright © 2009  Red Hat, 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 86 matching lines @@
 hb_blob_create (const char        *data,
                 unsigned int       length,
                 hb_memory_mode_t   mode,
                 void              *user_data,
                 hb_destroy_func_t  destroy)
 {
   hb_blob_t *blob;
 
   if (!length ||
       length >= 1u << 31 ||
-      data + length < data /* overflows */ ||
       !(blob = hb_object_create<hb_blob_t> ())) {
     if (destroy)
       destroy (user_data);
     return hb_blob_get_empty ();
   }
 
   blob->data = data;
   blob->length = length;
   blob->mode = mode;
 
@@ skipping 352 matching lines @@
 
   memcpy (new_data, blob->data, blob->length);
   _hb_blob_destroy_user_data (blob);
   blob->mode = HB_MEMORY_MODE_WRITABLE;
   blob->data = new_data;
   blob->user_data = new_data;
   blob->destroy = free;
 
   return true;
 }