tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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hb-blob.hh (2765B)

      1 /*
      2 * Copyright © 2009  Red Hat, Inc.
      3 * Copyright © 2018  Google, Inc.
      4 *
      5 *  This is part of HarfBuzz, a text shaping library.
      6 *
      7 * Permission is hereby granted, without written agreement and without
      8 * license or royalty fees, to use, copy, modify, and distribute this
      9 * software and its documentation for any purpose, provided that the
     10 * above copyright notice and the following two paragraphs appear in
     11 * all copies of this software.
     12 *
     13 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
     14 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
     15 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
     16 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
     17 * DAMAGE.
     18 *
     19 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
     20 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
     21 * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
     22 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
     23 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
     24 *
     25 * Red Hat Author(s): Behdad Esfahbod
     26 * Google Author(s): Behdad Esfahbod
     27 */
     28 
     29 #ifndef HB_BLOB_HH
     30 #define HB_BLOB_HH
     31 
     32 #include "hb.hh"
     33 
     34 
     35 /*
     36 * hb_blob_t
     37 */
     38 
     39 struct hb_blob_t
     40 {
     41  ~hb_blob_t () { destroy_user_data (); }
     42 
     43  void destroy_user_data ()
     44  {
     45    if (destroy)
     46    {
     47      destroy (user_data);
     48      user_data = nullptr;
     49      destroy = nullptr;
     50    }
     51  }
     52 
     53  HB_INTERNAL bool try_make_writable ();
     54  HB_INTERNAL bool try_make_writable_inplace ();
     55  HB_INTERNAL bool try_make_writable_inplace_unix ();
     56 
     57  hb_bytes_t as_bytes () const { return hb_bytes_t (data, length); }
     58  template <typename Type>
     59  const Type* as () const { return as_bytes ().as<Type> (); }
     60 
     61  public:
     62  hb_object_header_t header;
     63 
     64  const char *data = nullptr;
     65  unsigned int length = 0;
     66  hb_memory_mode_t mode = (hb_memory_mode_t) 0;
     67 
     68  void *user_data = nullptr;
     69  hb_destroy_func_t destroy = nullptr;
     70 };
     71 
     72 
     73 /*
     74 * hb_blob_ptr_t
     75 */
     76 
     77 template <typename P>
     78 struct hb_blob_ptr_t
     79 {
     80  typedef hb_remove_pointer<P> T;
     81 
     82  hb_blob_ptr_t (hb_blob_t *b_ = nullptr) : b (b_) {}
     83  hb_blob_t * operator = (hb_blob_t *b_) { return b = b_; }
     84  const T * operator -> () const { return get (); }
     85  const T & operator * () const  { return *get (); }
     86  template <typename C> operator const C * () const { return get (); }
     87  operator const char * () const { return (const char *) get (); }
     88  const T * get () const { return b->as<T> (); }
     89  hb_blob_t * get_blob () const { return b.get_raw (); }
     90  unsigned int get_length () const { return b.get ()->length; }
     91  void destroy () { hb_blob_destroy (b.get_raw ()); b = nullptr; }
     92 
     93  private:
     94  hb_nonnull_ptr_t<hb_blob_t> b;
     95 };
     96 
     97 
     98 #endif /* HB_BLOB_HH */