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diff --git a/lzma/lzma/lzma_decoder.h b/lzma/lzma/lzma_decoder.h
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+++ b/lzma/lzma/lzma_decoder.h
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+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       lzma_decoder.h
+/// \brief      LZMA decoder API
+///
+//  Authors:    Igor Pavlov
+//              Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef LZMA_LZMA_DECODER_H
+#define LZMA_LZMA_DECODER_H
+
+#include "common.h"
+
+
+/// Allocates and initializes LZMA decoder
+extern lzma_ret lzma_lzma_decoder_init(lzma_next_coder *next,
+		const lzma_allocator *allocator,
+		const lzma_filter_info *filters);
+
+extern uint64_t lzma_lzma_decoder_memusage(const void *options);
+
+extern lzma_ret lzma_lzma_props_decode(
+		void **options, const lzma_allocator *allocator,
+		const uint8_t *props, size_t props_size);
+
+
+/// \brief      Decodes the LZMA Properties byte (lc/lp/pb)
+///
+/// \return     true if error occurred, false on success
+///
+extern bool lzma_lzma_lclppb_decode(
+		lzma_options_lzma *options, uint8_t byte);
+
+
+#ifdef LZMA_LZ_DECODER_H
+/// Allocate and setup function pointers only. This is used by LZMA1 and
+/// LZMA2 decoders.
+extern lzma_ret lzma_lzma_decoder_create(
+		lzma_lz_decoder *lz, const lzma_allocator *allocator,
+		const void *opt, lzma_lz_options *lz_options);
+
+/// Gets memory usage without validating lc/lp/pb. This is used by LZMA2
+/// decoder, because raw LZMA2 decoding doesn't need lc/lp/pb.
+extern uint64_t lzma_lzma_decoder_memusage_nocheck(const void *options);
+
+#endif
+
+#endif