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diff --git a/web/server/h2o/libh2o/deps/brotli/enc/compress_fragment_two_pass.h b/web/server/h2o/libh2o/deps/brotli/enc/compress_fragment_two_pass.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
+*/
+
+// Function for fast encoding of an input fragment, independently from the input
+// history. This function uses two-pass processing: in the first pass we save
+// the found backward matches and literal bytes into a buffer, and in the
+// second pass we emit them into the bit stream using prefix codes built based
+// on the actual command and literal byte histograms.
+
+#ifndef BROTLI_ENC_COMPRESS_FRAGMENT_TWO_PASS_H_
+#define BROTLI_ENC_COMPRESS_FRAGMENT_TWO_PASS_H_
+
+#include "./types.h"
+
+namespace brotli {
+
+static const size_t kCompressFragmentTwoPassBlockSize = 1 << 17;
+
+// Compresses "input" string to the "*storage" buffer as one or more complete
+// meta-blocks, and updates the "*storage_ix" bit position.
+//
+// If "is_last" is true, emits an additional empty last meta-block.
+//
+// REQUIRES: "input_size" is greater than zero, or "is_last" is true.
+// REQUIRES: "command_buf" and "literal_buf" point to at least
+//            kCompressFragmentTwoPassBlockSize long arrays.
+// REQUIRES: All elements in "table[0..table_size-1]" are initialized to zero.
+// REQUIRES: "table_size" is a power of two
+void BrotliCompressFragmentTwoPass(const uint8_t* input, size_t input_size,
+                                   bool is_last,
+                                   uint32_t* command_buf, uint8_t* literal_buf,
+                                   int* table, size_t table_size,
+                                   size_t* storage_ix, uint8_t* storage);
+
+}  // namespace brotli
+
+#endif  // BROTLI_ENC_COMPRESS_FRAGMENT_TWO_PASS_H_