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diff --git a/third_party/jpeg-xl/lib/jxl/jpeg/enc_jpeg_data_reader.h b/third_party/jpeg-xl/lib/jxl/jpeg/enc_jpeg_data_reader.h
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+++ b/third_party/jpeg-xl/lib/jxl/jpeg/enc_jpeg_data_reader.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 reading a jpeg byte stream into a JPEGData object.
+
+#ifndef LIB_JXL_JPEG_ENC_JPEG_DATA_READER_H_
+#define LIB_JXL_JPEG_ENC_JPEG_DATA_READER_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "lib/jxl/jpeg/jpeg_data.h"
+
+namespace jxl {
+namespace jpeg {
+
+enum class JpegReadMode {
+  kReadHeader,  // only basic headers
+  kReadTables,  // headers and tables (quant, Huffman, ...)
+  kReadAll,     // everything
+};
+
+// Parses the JPEG stream contained in data[*pos ... len) and fills in *jpg with
+// the parsed information.
+// If mode is kReadHeader, it fills in only the image dimensions in *jpg.
+// Returns false if the data is not valid JPEG, or if it contains an unsupported
+// JPEG feature.
+bool ReadJpeg(const uint8_t* data, const size_t len, JpegReadMode mode,
+              JPEGData* jpg);
+
+}  // namespace jpeg
+}  // namespace jxl
+
+#endif  // LIB_JXL_JPEG_ENC_JPEG_DATA_READER_H_