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diff --git a/third_party/jpeg-xl/lib/jxl/jpeg/dec_jpeg_data_writer.h b/third_party/jpeg-xl/lib/jxl/jpeg/dec_jpeg_data_writer.h
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+++ b/third_party/jpeg-xl/lib/jxl/jpeg/dec_jpeg_data_writer.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.
+
+// Functions for writing a JPEGData object into a jpeg byte stream.
+
+#ifndef LIB_JXL_JPEG_DEC_JPEG_DATA_WRITER_H_
+#define LIB_JXL_JPEG_DEC_JPEG_DATA_WRITER_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include <functional>
+
+#include "lib/jxl/jpeg/dec_jpeg_serialization_state.h"
+#include "lib/jxl/jpeg/jpeg_data.h"
+
+namespace jxl {
+namespace jpeg {
+
+// Function type used to write len bytes into buf. Returns the number of bytes
+// written.
+using JPEGOutput = std::function<size_t(const uint8_t* buf, size_t len)>;
+
+Status WriteJpeg(const JPEGData& jpg, const JPEGOutput& out);
+
+// Same as WriteJpeg, but instead of writing to the output, collects statistics
+// about the bit-stream into `ss`.
+Status ProcessJpeg(const JPEGData& jpg, SerializationState* ss);
+
+}  // namespace jpeg
+}  // namespace jxl
+
+#endif  // LIB_JXL_JPEG_DEC_JPEG_DATA_WRITER_H_