1 files changed, 80 insertions, 0 deletions
diff --git a/thirdparty/harfbuzz/src/graph/coverage-graph.hh b/thirdparty/harfbuzz/src/graph/coverage-graph.hh
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+++ b/thirdparty/harfbuzz/src/graph/coverage-graph.hh
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+/*
+ * Copyright © 2022  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.
+ *
+ * Google Author(s): Garret Rieger
+ */
+
+#include "graph.hh"
+#include "../OT/Layout/Common/Coverage.hh"
+
+#ifndef GRAPH_COVERAGE_GRAPH_HH
+#define GRAPH_COVERAGE_GRAPH_HH
+
+namespace graph {
+
+struct CoverageFormat1 : public OT::Layout::Common::CoverageFormat1_3<SmallTypes>
+{
+  bool sanitize (graph_t::vertex_t& vertex) const
+  {
+    int64_t vertex_len = vertex.obj.tail - vertex.obj.head;
+    constexpr unsigned min_size = OT::Layout::Common::CoverageFormat1_3<SmallTypes>::min_size;
+    if (vertex_len < min_size) return false;
+    return vertex_len >= min_size + glyphArray.get_size () - glyphArray.len.get_size ();
+  }
+};
+
+struct CoverageFormat2 : public OT::Layout::Common::CoverageFormat2_4<SmallTypes>
+{
+  bool sanitize (graph_t::vertex_t& vertex) const
+  {
+    int64_t vertex_len = vertex.obj.tail - vertex.obj.head;
+    constexpr unsigned min_size = OT::Layout::Common::CoverageFormat2_4<SmallTypes>::min_size;
+    if (vertex_len < min_size) return false;
+    return vertex_len >= min_size + rangeRecord.get_size () - rangeRecord.len.get_size ();
+  }
+};
+
+struct Coverage : public OT::Layout::Common::Coverage
+{
+  bool sanitize (graph_t::vertex_t& vertex) const
+  {
+    int64_t vertex_len = vertex.obj.tail - vertex.obj.head;
+    if (vertex_len < OT::Layout::Common::Coverage::min_size) return false;
+    switch (u.format)
+    {
+    case 1: return ((CoverageFormat1*)this)->sanitize (vertex);
+    case 2: return ((CoverageFormat2*)this)->sanitize (vertex);
+#ifndef HB_NO_BORING_EXPANSION
+    // Not currently supported
+    case 3:
+    case 4:
+#endif
+    default: return false;
+    }
+  }
+};
+
+
+}
+
+#endif  // GRAPH_COVERAGE_GRAPH_HH