Roll OTS to 8d70cffebbfa

third_party/ots/src/math.cc

 // Copyright (c) 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // We use an underscore to avoid confusion with the standard math.h library.
 #include "math_.h"
 
 #include <limits>
 #include <vector>
 
@@ skipping 430 matching lines @@
 }
 
 bool ParseMathGlyphConstructionSequence(const ots::Font *font,
                                         ots::Buffer* subtable,
                                         const uint8_t *data,
                                         size_t length,
                                         const uint16_t num_glyphs,
                                         uint16_t offset_coverage,
                                         uint16_t glyph_count,
                                         const unsigned sequence_end) {
+  // Zero glyph count, nothing to parse.
+  if (!glyph_count) {
+    return true;
+  }
+
   // Check coverage table.
   if (offset_coverage < sequence_end || offset_coverage >= length) {
     return OTS_FAILURE();
   }
   if (!ots::ParseCoverageTable(font, data + offset_coverage,
                                length - offset_coverage,
                                num_glyphs, glyph_count)) {
     return OTS_FAILURE();
   }
 
@@ skipping 144 matching lines @@
 }
 
 void ots_math_free(Font *font) {
   delete font->math;
 }
 
 }  // namespace ots
 
 #undef TABLE_NAME
 #undef DROP_THIS_TABLE