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diff --git a/src/liblzma/api/lzma/metadata.h b/src/liblzma/api/lzma/metadata.h
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+/**
+ * \file        lzma/metadata.h
+ * \brief       Metadata handling
+ *
+ * \author      Copyright (C) 1999-2006 Igor Pavlov
+ * \author      Copyright (C) 2007 Lasse Collin
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ */
+
+#ifndef LZMA_H_INTERNAL
+#	error Never include this file directly. Use <lzma.h> instead.
+#endif
+
+
+/**
+ * \brief       Information stored into a Metadata Block
+ *
+ * This structure holds all the information that can be stored to
+ * a Metadata Block.
+ */
+typedef struct {
+	/**
+	 * \brief       Size of Header Metadata Block
+	 */
+	lzma_vli header_metadata_size;
+
+	/**
+	 * \brief       Total Size of the Stream
+	 */
+	lzma_vli total_size;
+
+	/**
+	 * \brief       Uncompressed Size of the Stream
+	 */
+	lzma_vli uncompressed_size;
+
+	/**
+	 * \brief       Index of the Blocks stored in the Stream
+	 */
+	lzma_index *index;
+
+	/**
+	 * \brief       Extra information
+	 */
+	lzma_extra *extra;
+
+} lzma_metadata;
+
+
+/**
+ * \brief       Calculate the encoded size of Metadata
+ *
+ * \return      Uncompressed size of the Metadata in encoded form. This value
+ *              may be passed to Block encoder as Uncompressed Size when using
+ *              Metadata filter. On error, zero is returned.
+ */
+extern lzma_vli lzma_metadata_size(const lzma_metadata *metadata);
+
+
+/**
+ * \brief       Initializes Metadata encoder
+ *
+ * \param       coder       Pointer to a pointer to hold Metadata encoder's
+ *                          internal state. Original value is ignored, thus
+ *                          you don't need to initialize the pointer.
+ * \param       allocator   Custom memory allocator; usually NULL.
+ * \param       metadata    Pointer to Metadata to encoded
+ *
+ * \return      - LZMA_OK: Initialization succeeded.
+ *              - LZMA_MEM_ERROR: Cannot allocate memory for *coder.
+ *
+ * The initialization function makes internal copy of the *metadata structure.
+ * However, the linked lists metadata->index and metadata->extra are NOT
+ * copied. Thus, the application may destroy *metadata after initialization
+ * if it likes, but not Index or Extra.
+ */
+extern lzma_ret lzma_metadata_encoder(lzma_stream *strm,
+		lzma_options_block *options, const lzma_metadata *metadata);
+
+
+/**
+ * \brief       Initializes Metadata decoder
+ *
+ * \param       want_extra    If this is true, Extra Records will be stored
+ *                            to metadata->extra. If this is false, Extra
+ *                            Records will be parsed but not stored anywhere,
+ *                            metadata->extra will be set to NULL.
+ */
+extern lzma_ret lzma_metadata_decoder(
+		lzma_stream *strm, lzma_options_block *options,
+		lzma_metadata *metadata, lzma_bool want_extra);