tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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hb-subset-serialize.cc (2340B)

      1 /*
      2 * Copyright © 2022  Google, Inc.
      3 *
      4 *  This is part of HarfBuzz, a text shaping library.
      5 *
      6 * Permission is hereby granted, without written agreement and without
      7 * license or royalty fees, to use, copy, modify, and distribute this
      8 * software and its documentation for any purpose, provided that the
      9 * above copyright notice and the following two paragraphs appear in
     10 * all copies of this software.
     11 *
     12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
     13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
     14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
     15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
     16 * DAMAGE.
     17 *
     18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
     19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
     20 * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
     21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
     22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
     23 *
     24 */
     25 
     26 #include "hb.hh"
     27 
     28 #include "hb-subset-serialize.h"
     29 #include "hb-repacker.hh"
     30 
     31 /**
     32 * hb_subset_serialize_or_fail:
     33 * @table_tag: tag of the table being packed, needed to allow table specific optimizations.
     34 * @hb_objects: raw array of struct hb_subset_serialize_object_t, which provides
     35 * object graph info
     36 * @num_hb_objs: number of hb_subset_serialize_object_t in the hb_objects array.
     37 *
     38 * Given the input object graph info, repack a table to eliminate offset overflows and
     39 * serialize it into a continuous array of bytes. A nullptr is returned if the serializing attempt fails.
     40 * Table specific optimizations (eg. extension promotion in GSUB/GPOS) may be performed.
     41 * Passing HB_TAG_NONE will disable table specific optimizations.
     42 *
     43 * Since: 10.2.0
     44 **/
     45 HB_EXTERN hb_blob_t *
     46 hb_subset_serialize_or_fail (hb_tag_t                      table_tag,
     47                             hb_subset_serialize_object_t *hb_objects,
     48                             unsigned                      num_hb_objs)
     49 {
     50  hb_vector_t<const hb_subset_serialize_object_t *> packed;
     51  packed.alloc (num_hb_objs + 1);
     52  packed.push (nullptr);
     53  for (unsigned i = 0 ; i < num_hb_objs ; i++)
     54    packed.push (&(hb_objects[i]));
     55 
     56  return hb_resolve_overflows (packed, table_tag, 20, true);
     57 }