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diff --git a/src/liblzma/common/index.h b/src/liblzma/common/index.h
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+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       index.h
+/// \brief      Handling of Index
+//
+//  Copyright (C) 2008 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_INDEX_H
+#define LZMA_INDEX_H
+
+#include "common.h"
+
+
+/// Maximum encoded value of Total Size.
+#define TOTAL_SIZE_ENCODED_MAX (LZMA_VLI_VALUE_MAX / 4 - 1)
+
+/// Convert the real Total Size value to a value that is stored to the Index.
+#define total_size_encode(size) ((size) / 4 - 1)
+
+/// Convert the encoded Total Size value from Index to the real Total Size.
+#define total_size_decode(size) (((size) + 1) * 4)
+
+
+/// Get the size of the Index Padding field. This is needed by Index encoder
+/// and decoder, but applications should have no use for this.
+extern uint32_t lzma_index_padding_size(const lzma_index *i);
+
+
+static inline lzma_vli
+index_size_unpadded(lzma_vli count, lzma_vli index_list_size)
+{
+	// Index Indicator + Number of Records + List of Records + CRC32
+	return 1 + lzma_vli_size(count) + index_list_size + 4;
+}
+
+
+static inline lzma_vli
+index_size(lzma_vli count, lzma_vli index_list_size)
+{
+	// Round up to a mulitiple of four.
+	return (index_size_unpadded(count, index_list_size) + 3)
+			& ~LZMA_VLI_C(3);
+}
+
+
+static inline lzma_vli
+index_stream_size(
+		lzma_vli total_size, lzma_vli count, lzma_vli index_list_size)
+{
+	return LZMA_STREAM_HEADER_SIZE + total_size
+			+ index_size(count, index_list_size)
+			+ LZMA_STREAM_HEADER_SIZE;
+}
+
+#endif