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diff --git a/src/liblzma/simple/simple_private.h b/src/liblzma/simple/simple_private.h
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+++ b/src/liblzma/simple/simple_private.h
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+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       simple_private.h
+/// \brief      Private definitions for so called simple filters
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef LZMA_SIMPLE_PRIVATE_H
+#define LZMA_SIMPLE_PRIVATE_H
+
+#include "simple_coder.h"
+
+
+typedef struct {
+	/// Next filter in the chain
+	lzma_next_coder next;
+
+	/// True if the next coder in the chain has returned LZMA_STREAM_END.
+	bool end_was_reached;
+
+	/// True if filter() should encode the data; false to decode.
+	/// Currently all simple filters use the same function for encoding
+	/// and decoding, because the difference between encoders and decoders
+	/// is very small.
+	bool is_encoder;
+
+	/// Pointer to filter-specific function, which does
+	/// the actual filtering.
+	size_t (*filter)(void *simple, uint32_t now_pos,
+			bool is_encoder, uint8_t *buffer, size_t size);
+
+	/// Pointer to filter-specific data, or NULL if filter doesn't need
+	/// any extra data.
+	void *simple;
+
+	/// The lowest 32 bits of the current position in the data. Most
+	/// filters need this to do conversions between absolute and relative
+	/// addresses.
+	uint32_t now_pos;
+
+	/// Size of the memory allocated for the buffer.
+	size_t allocated;
+
+	/// Flushing position in the temporary buffer. buffer[pos] is the
+	/// next byte to be copied to out[].
+	size_t pos;
+
+	/// buffer[filtered] is the first unfiltered byte. When pos is smaller
+	/// than filtered, there is unflushed filtered data in the buffer.
+	size_t filtered;
+
+	/// Total number of bytes (both filtered and unfiltered) currently
+	/// in the temporary buffer.
+	size_t size;
+
+	/// Temporary buffer
+	uint8_t buffer[];
+} lzma_simple_coder;
+
+
+extern lzma_ret lzma_simple_coder_init(lzma_next_coder *next,
+		const lzma_allocator *allocator,
+		const lzma_filter_info *filters,
+		size_t (*filter)(void *simple, uint32_t now_pos,
+			bool is_encoder, uint8_t *buffer, size_t size),
+		size_t simple_size, size_t unfiltered_max,
+		uint32_t alignment, bool is_encoder);
+
+#endif