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diff --git a/extern/draco/draco/src/draco/compression/entropy/symbol_encoding.h b/extern/draco/draco/src/draco/compression/entropy/symbol_encoding.h
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+// Copyright 2016 The Draco Authors.
+//
+// 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.
+//
+#ifndef DRACO_COMPRESSION_ENTROPY_SYMBOL_ENCODING_H_
+#define DRACO_COMPRESSION_ENTROPY_SYMBOL_ENCODING_H_
+
+#include "draco/compression/config/compression_shared.h"
+#include "draco/core/encoder_buffer.h"
+#include "draco/core/options.h"
+
+namespace draco {
+
+// Encodes an array of symbols using an entropy coding. This function
+// automatically decides whether to encode the symbol values using bit
+// length tags (see EncodeTaggedSymbols), or whether to encode them directly
+// (see EncodeRawSymbols). The symbols can be grouped into separate components
+// that can be used for better compression. |options| is an optional parameter
+// that allows more direct control over various stages of the symbol encoding
+// (see below for functions that are used to set valid options).
+// Returns false on error.
+bool EncodeSymbols(const uint32_t *symbols, int num_values, int num_components,
+                   const Options *options, EncoderBuffer *target_buffer);
+
+// Sets an option that forces symbol encoder to use the specified encoding
+// method.
+void SetSymbolEncodingMethod(Options *options, SymbolCodingMethod method);
+
+// Sets the desired compression level for symbol encoding in range <0, 10> where
+// 0 is the worst but fastest compression and 10 is the best but slowest
+// compression. If the option is not set, default value of 7 is used.
+// Returns false if an invalid level has been set.
+bool SetSymbolEncodingCompressionLevel(Options *options, int compression_level);
+
+}  // namespace draco
+
+#endif  // DRACO_COMPRESSION_ENTROPY_SYMBOL_ENCODING_H_