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products/Sources/formale Sprachen/Java/Openjdk/src/java.desktop/share/native/libharfbuzz/ (Sun/Oracle ^©) Datei vom 13.11.2022 mit Größe 2 kB

Quelle hb-blob.hh Sprache: C

/*
* 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
{
  void fini_shallow () { 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;
  unsigned int length;
  hb_memory_mode_t mode;

  void *user_data;
  hb_destroy_func_t destroy;
};

/*
* 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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