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_PRIVATE_HH 30 #define HB_BLOB_PRIVATE_HH 31 32 #include "hb-private.hh" 33 34 #include "hb-object-private.hh" 35 36 37 /* 38 * hb_blob_t 39 */ 40 41 struct hb_blob_t 42 { 43 inline void fini_shallow (void) 44 { 45 destroy_user_data (); 46 } 47 48 inline void destroy_user_data (void) 49 { 50 if (destroy) 51 { 52 destroy (user_data); 53 user_data = nullptr; 54 destroy = nullptr; 55 } 56 } 57 58 HB_INTERNAL bool try_make_writable (void); 59 HB_INTERNAL bool try_make_writable_inplace (void); 60 HB_INTERNAL bool try_make_writable_inplace_unix (void); 61 62 inline void lock (void) 63 { 64 hb_blob_make_immutable (this); 65 } 66 67 template <typename Type> 68 inline const Type* as (void) const 69 { 70 return unlikely (!data) ? &Null(Type) : reinterpret_cast<const Type *> (data); 71 } 72 73 public: 74 hb_object_header_t header; 75 ASSERT_POD (); 76 77 bool immutable; 78 79 const char *data; 80 unsigned int length; 81 hb_memory_mode_t mode; 82 83 void *user_data; 84 hb_destroy_func_t destroy; 85 }; 86 87 88 #endif /* HB_BLOB_PRIVATE_HH */