gfx/harfbuzz/src/hb-blob.hh

   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 */