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
39struct hb_blob_t
40{
41 inline void fini_shallow (void)
42 {
43 destroy_user_data ();
44 }
45
46 inline void destroy_user_data (void)
47 {
48 if (destroy)
49 {
50 destroy (user_data);
51 user_data = nullptr;
52 destroy = nullptr;
53 }
54 }
55
56 HB_INTERNAL bool try_make_writable (void);
57 HB_INTERNAL bool try_make_writable_inplace (void);
58 HB_INTERNAL bool try_make_writable_inplace_unix (void);
59
60 template <typename Type>
61 inline const Type* as (void) const
62 {
63 return unlikely (!data) ? &Null(Type) : reinterpret_cast<const Type *> (data);
64 }
65 inline hb_bytes_t as_bytes (void) const
66 {
67 return hb_bytes_t (data, length);
68 }
69
70 public:
71 hb_object_header_t header;
72 ASSERT_POD ();
73
74 bool immutable;
75
76 const char *data;
77 unsigned int length;
78 hb_memory_mode_t mode;
79
80 void *user_data;
81 hb_destroy_func_t destroy;
82};
83DECLARE_NULL_INSTANCE (hb_blob_t);
84
85
86#endif /* HB_BLOB_HH */
87