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diff --git a/third_party/jpeg-xl/lib/jxl/jpeg/enc_jpeg_data.h b/third_party/jpeg-xl/lib/jxl/jpeg/enc_jpeg_data.h
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index 0000000000..806128c465
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+++ b/third_party/jpeg-xl/lib/jxl/jpeg/enc_jpeg_data.h
@@ -0,0 +1,31 @@
+// 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_JPEG_ENC_JPEG_DATA_H_
+#define LIB_JXL_JPEG_ENC_JPEG_DATA_H_
+
+#include "lib/jxl/base/padded_bytes.h"
+#include "lib/jxl/codec_in_out.h"
+#include "lib/jxl/enc_params.h"
+#include "lib/jxl/jpeg/jpeg_data.h"
+
+namespace jxl {
+namespace jpeg {
+Status EncodeJPEGData(JPEGData& jpeg_data, PaddedBytes* bytes,
+                      const CompressParams& cparams);
+
+Status SetColorEncodingFromJpegData(const jpeg::JPEGData& jpg,
+                                    ColorEncoding* color_encoding);
+
+/**
+ * Decodes bytes containing JPEG codestream into a CodecInOut as coefficients
+ * only, for lossless JPEG transcoding.
+ */
+Status DecodeImageJPG(Span<const uint8_t> bytes, CodecInOut* io);
+
+}  // namespace jpeg
+}  // namespace jxl
+
+#endif  // LIB_JXL_JPEG_ENC_JPEG_DATA_H_