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+/*
+ * 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 */