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diff --git a/modules/woff2/src/woff2_out.h b/modules/woff2/src/woff2_out.h
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+++ b/modules/woff2/src/woff2_out.h
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+// Copyright 2016 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.
+//
+// Output buffer for WOFF2 decompression.
+
+// Copyright 2016 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.
+//
+// Output buffer for WOFF2 decompression.
+
+#ifndef WOFF2_WOFF2_OUT_H_
+#define WOFF2_WOFF2_OUT_H_
+
+#include <algorithm>
+#include <cstring>
+#include <memory>
+#include <string>
+#include "./port.h"
+
+namespace woff2 {
+
+// Suggested max size for output.
+const size_t kDefaultMaxSize = 30 * 1024 * 1024;
+
+using std::string;
+
+
+/**
+ * Output interface for the woff2 decoding.
+ *
+ * Writes to arbitrary offsets are supported to facilitate updating offset
+ * table and checksums after tables are ready. Reading the current size is
+ * supported so a 'loca' table can be built up while writing glyphs.
+ *
+ * By default limits size to kDefaultMaxSize.
+ */
+class WOFF2Out {
+ public:
+  virtual ~WOFF2Out(void) {}
+
+  // Append n bytes of data from buf.
+  // Return true if all written, false otherwise.
+  virtual bool Write(const void *buf, size_t n) = 0;
+
+  // Write n bytes of data from buf at offset.
+  // Return true if all written, false otherwise.
+  virtual bool Write(const void *buf, size_t offset, size_t n) = 0;
+
+  virtual size_t Size() = 0;
+};
+
+/**
+ * Expanding memory block for woff2 out. By default limited to kDefaultMaxSize.
+ */
+class WOFF2StringOut : public WOFF2Out {
+ public:
+  // Create a writer that writes its data to buf.
+  // buf->size() will grow to at most max_size
+  // buf may be sized (e.g. using EstimateWOFF2FinalSize) or empty.
+  explicit WOFF2StringOut(string* buf);
+
+  bool Write(const void *buf, size_t n) override;
+  bool Write(const void *buf, size_t offset, size_t n) override;
+  size_t Size() override { return offset_; }
+  size_t MaxSize() { return max_size_; }
+  void SetMaxSize(size_t max_size);
+ private:
+  string* buf_;
+  size_t max_size_;
+  size_t offset_;
+};
+
+/**
+ * Fixed memory block for woff2 out.
+ */
+class WOFF2MemoryOut : public WOFF2Out {
+ public:
+  // Create a writer that writes its data to buf.
+  WOFF2MemoryOut(uint8_t* buf, size_t buf_size);
+
+  bool Write(const void *buf, size_t n) override;
+  bool Write(const void *buf, size_t offset, size_t n) override;
+  size_t Size() override { return offset_; }
+ private:
+  uint8_t* buf_;
+  size_t buf_size_;
+  size_t offset_;
+};
+
+} // namespace woff2
+
+#endif  // WOFF2_WOFF2_OUT_H_