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diff --git a/third_party/jpeg-xl/lib/jxl/dec_huffman.h b/third_party/jpeg-xl/lib/jxl/dec_huffman.h
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+++ b/third_party/jpeg-xl/lib/jxl/dec_huffman.h
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+// Copyright (c) the JPEG XL Project Authors. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#ifndef LIB_JXL_DEC_HUFFMAN_H_
+#define LIB_JXL_DEC_HUFFMAN_H_
+
+#include <memory>
+#include <vector>
+
+#include "lib/jxl/dec_bit_reader.h"
+#include "lib/jxl/huffman_table.h"
+
+namespace jxl {
+
+static constexpr size_t kHuffmanTableBits = 8u;
+
+struct HuffmanDecodingData {
+  // Decodes the Huffman code lengths from the bit-stream and fills in the
+  // pre-allocated table with the corresponding 2-level Huffman decoding table.
+  // Returns false if the Huffman code lengths can not de decoded.
+  bool ReadFromBitStream(size_t alphabet_size, BitReader* br);
+
+  uint16_t ReadSymbol(BitReader* br) const;
+
+  std::vector<HuffmanCode> table_;
+};
+
+}  // namespace jxl
+
+#endif  // LIB_JXL_DEC_HUFFMAN_H_