Add woff2 to src/third_party

third_party/woff2/src/woff2_enc.h

+// Copyright 2014 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Library for converting WOFF2 format font files to their TTF versions.
+
+#ifndef WOFF2_WOFF2_ENC_H_
+#define WOFF2_WOFF2_ENC_H_
+
+#include <stddef.h>
+#include <inttypes.h>
+#include <string>
+
+using std::string;
+
+
+namespace woff2 {
+
+// Returns an upper bound on the size of the compressed file.
+size_t MaxWOFF2CompressedSize(const uint8_t* data, size_t length);
+size_t MaxWOFF2CompressedSize(const uint8_t* data, size_t length,
+                              const string& extended_metadata);
+
+// Compresses the font into the target buffer. *result_length should be at least
+// the value returned by MaxWOFF2CompressedSize(), upon return, it is set to the
+// actual compressed size. Returns true on successful compression.
+bool ConvertTTFToWOFF2(const uint8_t *data, size_t length,
+                       uint8_t *result, size_t *result_length);
+
+bool ConvertTTFToWOFF2(const uint8_t *data, size_t length,
+                       uint8_t *result, size_t *result_length,
+                       const string& extended_metadata);
+
+} // namespace woff2
+
+#endif  // WOFF2_WOFF2_ENC_H_