hb-blob.hh - mozsearch

Enable keyboard shortcuts

/*

 * 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 */