[OTS] Fix WOFF2 decode error

src/ots.h

 // Copyright (c) 2009 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.
 
 #ifndef OTS_H_
 #define OTS_H_
 
 #include <stddef.h>
 #include <cstdarg>
 #include <cstddef>
@@ skipping 155 matching lines @@
 
 // Round a value up to the nearest multiple of 4. Don't round the value in the
 // case that rounding up overflows.
 template<typename T> T Round4(T value) {
   if (std::numeric_limits<T>::max() - value < 3) {
     return value;
   }
   return (value + 3) & ~3;
 }
 
+template<typename T> T Round2(T value) {
+  if (value == std::numeric_limits<T>::max()) {
+    return value;
+  }
+  return (value + 1) & ~1;
+}
+
 bool IsValidVersionTag(uint32_t tag);
 
 #define FOR_EACH_TABLE_TYPE \
   F(cff, CFF) \
   F(cmap, CMAP) \
   F(cvt, CVT) \
   F(fpgm, FPGM) \
   F(gasp, GASP) \
   F(gdef, GDEF) \
   F(glyf, GLYF) \
@@ skipping 43 matching lines @@
 bool ots_##name##_should_serialise(OpenTypeFile *f); \
 bool ots_##name##_serialise(OTSStream *s, OpenTypeFile *f); \
 void ots_##name##_free(OpenTypeFile *f);
 // TODO(yusukes): change these function names to follow Chromium coding rule.
 FOR_EACH_TABLE_TYPE
 #undef F
 
 }  // namespace ots
 
 #endif  // OTS_H_