[OTS] Integrate WOFF 2.0 algorithm into OTS

src/gpos.cc

 // Copyright (c) 2011 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.
 
 #include "gpos.h"
 
 #include <limits>
 #include <vector>
 
 #include "gdef.h"
@@ skipping 51 matching lines @@
   {GPOS_TYPE_PAIR_ADJUSTMENT, ParsePairAdjustment},
   {GPOS_TYPE_CURSIVE_ATTACHMENT, ParseCursiveAttachment},
   {GPOS_TYPE_MARK_TO_BASE_ATTACHMENT, ParseMarkToBaseAttachment},
   {GPOS_TYPE_MARK_TO_LIGATURE_ATTACHMENT, ParseMarkToLigatureAttachment},
   {GPOS_TYPE_MARK_TO_MARK_ATTACHMENT, ParseMarkToMarkAttachment},
   {GPOS_TYPE_CONTEXT_POSITIONING, ParseContextPositioning},
   {GPOS_TYPE_CHAINED_CONTEXT_POSITIONING, ParseChainedContextPositioning},
   {GPOS_TYPE_EXTENSION_POSITIONING, ParseExtensionPositioning}
 };
 
-// TODO(bashi): Port Chromium's arraysize macro and use it instead of sizeof().
 const ots::LookupSubtableParser kGposLookupSubtableParser = {
-  sizeof(kGposTypeParsers) / sizeof(kGposTypeParsers[0]),
+  arraysize(kGposTypeParsers),
   GPOS_TYPE_EXTENSION_POSITIONING, kGposTypeParsers
 };
 
 // Shared Tables: ValueRecord, Anchor Table, and MarkArray
 
 bool ParseValueRecord(ots::Buffer* subtable, const uint8_t *data,
                       const size_t length, const uint16_t value_format) {
   // Check existence of adjustment fields.
   for (unsigned i = 0; i < 4; ++i) {
     if ((value_format >> i) & 0x1) {
@@ skipping 717 matching lines @@
 
   return true;
 }
 
 void ots_gpos_free(OpenTypeFile *file) {
   delete file->gpos;
 }
 
 }  // namespace ots