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diff --git a/modules/woff2/src/variable_length.h b/modules/woff2/src/variable_length.h
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+/* Copyright 2015 Google Inc. All Rights Reserved.
+
+ Distributed under MIT license.
+ See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+/* Helper functions for woff2 variable length types: 255UInt16 and UIntBase128 */
+
+#ifndef WOFF2_VARIABLE_LENGTH_H_
+#define WOFF2_VARIABLE_LENGTH_H_
+
+#include <inttypes.h>
+#include <vector>
+#include "./buffer.h"
+
+namespace woff2 {
+
+size_t Size255UShort(uint16_t value);
+bool Read255UShort(Buffer* buf, unsigned int* value);
+void Write255UShort(std::vector<uint8_t>* out, int value);
+void Store255UShort(int val, size_t* offset, uint8_t* dst);
+
+size_t Base128Size(size_t n);
+bool ReadBase128(Buffer* buf, uint32_t* value);
+void StoreBase128(size_t len, size_t* offset, uint8_t* dst);
+
+} // namespace woff2
+
+#endif // WOFF2_VARIABLE_LENGTH_H_
+