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 void fini_shallow () { 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 template <typename Type> 58 const Type* as () const 59 { 60 return length < hb_null_size (Type) ? &Null(Type) : reinterpret_cast<const Type *> (data); 61 } 62 hb_bytes_t as_bytes () const 63 { return hb_bytes_t (data, length); } 64 65 public: 66 hb_object_header_t header; 67 68 const char *data; 69 unsigned int length; 70 hb_memory_mode_t mode; 71 72 void *user_data; 73 hb_destroy_func_t destroy; 74 }; 75 76 77 /* 78 * hb_blob_ptr_t 79 */ 80 81 template <typename P> 82 struct hb_blob_ptr_t 83 { 84 typedef typename hb_remove_pointer (P) T; 85 86 hb_blob_ptr_t (hb_blob_t *b_ = nullptr) : b (b_) {} 87 hb_blob_t * operator = (hb_blob_t *b_) { return b = b_; } 88 const T * operator -> () const { return get (); } 89 const T & operator * () const { return *get (); } 90 template <typename C> operator const C * () const { return get (); } 91 operator const char * () const { return (const char *) get (); } 92 const T * get () const { return b->as<T> (); } 93 hb_blob_t * get_blob () const { return b.get_raw (); } 94 unsigned int get_length () const { return b.get ()->length; } 95 void destroy () { hb_blob_destroy (b.get ()); b = nullptr; } 96 97 hb_nonnull_ptr_t<hb_blob_t> b; 98 }; 99 100 101 #endif /* HB_BLOB_HH */ 102
