kc3-lang/harfbuzz/src/hb-blob.hh

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• Hash : 9fc31db6
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  Date : 2022-07-20T16:03:02
  

  [blob] Initialize members if ever on the stack
  

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• src/hb-blob.hh

• /*
   * Copyright © 2009  Red Hat, Inc.
   * Copyright © 2018  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.
   *
   * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
   * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
   * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
   * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
   * DAMAGE.
   *
   * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
   * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
   * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
   * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
   * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
   *
   * Red Hat Author(s): Behdad Esfahbod
   * Google Author(s): Behdad Esfahbod
   */
  
  #ifndef HB_BLOB_HH
  #define HB_BLOB_HH
  
  #include "hb.hh"
  
  
  /*
   * hb_blob_t
   */
  
  struct hb_blob_t
  {
    ~hb_blob_t () { destroy_user_data (); }
  
    void destroy_user_data ()
    {
      if (destroy)
      {
        destroy (user_data);
        user_data = nullptr;
        destroy = nullptr;
      }
    }
  
    HB_INTERNAL bool try_make_writable ();
    HB_INTERNAL bool try_make_writable_inplace ();
    HB_INTERNAL bool try_make_writable_inplace_unix ();
  
    hb_bytes_t as_bytes () const { return hb_bytes_t (data, length); }
    template <typename Type>
    const Type* as () const { return as_bytes ().as<Type> (); }
  
    public:
    hb_object_header_t header;
  
    const char *data = nullptr;
    unsigned int length = 0;
    hb_memory_mode_t mode = (hb_memory_mode_t) 0;
  
    void *user_data = nullptr;
    hb_destroy_func_t destroy = nullptr;
  };
  
  
  /*
   * hb_blob_ptr_t
   */
  
  template <typename P>
  struct hb_blob_ptr_t
  {
    typedef hb_remove_pointer<P> T;
  
    hb_blob_ptr_t (hb_blob_t *b_ = nullptr) : b (b_) {}
    hb_blob_t * operator = (hb_blob_t *b_) { return b = b_; }
    const T * operator -> () const { return get (); }
    const T & operator * () const  { return *get (); }
    template <typename C> operator const C * () const { return get (); }
    operator const char * () const { return (const char *) get (); }
    const T * get () const { return b->as<T> (); }
    hb_blob_t * get_blob () const { return b.get_raw (); }
    unsigned int get_length () const { return b.get ()->length; }
    void destroy () { hb_blob_destroy (b.get_raw ()); b = nullptr; }
  
    private:
    hb_nonnull_ptr_t<hb_blob_t> b;
  };
  
  
  #endif /* HB_BLOB_HH */
  

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