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+/*
+ * Copyright © 2019 Ebrahim Byagowi
+ *
+ * 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.
+ */
+
+#ifndef HB_OT_META_TABLE_HH
+#define HB_OT_META_TABLE_HH
+
+#include "hb-open-type.hh"
+
+/*
+ * meta -- Metadata Table
+ * https://docs.microsoft.com/en-us/typography/opentype/spec/meta
+ * https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6meta.html
+ */
+#define HB_OT_TAG_meta HB_TAG ('m','e','t','a')
+
+
+namespace OT {
+
+
+struct DataMap
+{
+ int cmp (hb_tag_t a) const { return tag.cmp (a); }
+
+ hb_tag_t get_tag () const { return tag; }
+
+ hb_blob_t *reference_entry (hb_blob_t *meta_blob) const
+ { return hb_blob_create_sub_blob (meta_blob, dataZ, dataLength); }
+
+ bool sanitize (hb_sanitize_context_t *c, const void *base) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (likely (c->check_struct (this) &&
+ hb_barrier () &&
+ dataZ.sanitize (c, base, dataLength)));
+ }
+
+ protected:
+ Tag tag; /* A tag indicating the type of metadata. */
+ NNOffset32To<UnsizedArrayOf<HBUINT8>>
+ dataZ; /* Offset in bytes from the beginning of the
+ * metadata table to the data for this tag. */
+ HBUINT32 dataLength; /* Length of the data. The data is not required to
+ * be padded to any byte boundary. */
+ public:
+ DEFINE_SIZE_STATIC (12);
+};
+
+struct meta
+{
+ static constexpr hb_tag_t tableTag = HB_OT_TAG_meta;
+
+ struct accelerator_t
+ {
+ accelerator_t (hb_face_t *face)
+ { table = hb_sanitize_context_t ().reference_table<meta> (face); }
+ ~accelerator_t () { table.destroy (); }
+
+ hb_blob_t *reference_entry (hb_tag_t tag) const
+ { return table->dataMaps.lsearch (tag).reference_entry (table.get_blob ()); }
+
+ unsigned int get_entries (unsigned int start_offset,
+ unsigned int *count,
+ hb_ot_meta_tag_t *entries) const
+ {
+ if (count)
+ {
+ + table->dataMaps.as_array ().sub_array (start_offset, count)
+ | hb_map (&DataMap::get_tag)
+ | hb_map ([](hb_tag_t tag) { return (hb_ot_meta_tag_t) tag; })
+ | hb_sink (hb_array (entries, *count))
+ ;
+ }
+ return table->dataMaps.len;
+ }
+
+ private:
+ hb_blob_ptr_t<meta> table;
+ };
+
+ bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (likely (c->check_struct (this) &&
+ hb_barrier () &&
+ version == 1 &&
+ dataMaps.sanitize (c, this)));
+ }
+
+ protected:
+ HBUINT32 version; /* Version number of the metadata table — set to 1. */
+ HBUINT32 flags; /* Flags — currently unused; set to 0. */
+ HBUINT32 dataOffset;
+ /* Per Apple specification:
+ * Offset from the beginning of the table to the data.
+ * Per OT specification:
+ * Reserved. Not used; should be set to 0. */
+ Array32Of<DataMap>
+ dataMaps;/* Array of data map records. */
+ public:
+ DEFINE_SIZE_ARRAY (16, dataMaps);
+};
+
+struct meta_accelerator_t : meta::accelerator_t {
+ meta_accelerator_t (hb_face_t *face) : meta::accelerator_t (face) {}
+};
+
+} /* namespace OT */
+
+
+#endif /* HB_OT_META_TABLE_HH */