path: root/Build/source/utils/lzma-utils/src/liblzmadec/main.c

/******************************************************************************

    LZMA decoder library with a zlib like API

    Copyright (C) 1999-2005 Igor Pavlov (http://7-zip.org/)
    Copyright (C) 2005 Lasse Collin <lasse.collin@tukaani.org>
    Based on zlib.h and bzlib.h. FIXME

    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.

******************************************************************************/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

/* FIXME DEBUG */
#include <stdio.h>

#include <stdlib.h>
#include <inttypes.h>
#include <string.h>
#include <assert.h>
#include "lzmadec.h"
#include "private.h"

#ifndef UINT64_MAX
#define UINT64_MAX (~(uint64_t)0)
#endif

/* Cleaner way to refer to strm->state */
#define STATE ((lzmadec_state*)(strm->state))

static void *lzmadec_alloc (void *opaque, size_t nmemb, size_t size);
static void lzmadec_free (void *opaque, void *addr);
static int_fast8_t lzmadec_internal_init (lzmadec_stream *strm);
static inline int_fast8_t lzmadec_decode_main (
		lzmadec_stream *strm,
		const int_fast8_t finish_decoding);
static int_fast8_t lzmadec_header_properties (
		uint_fast8_t *pb,
		uint_fast8_t *lp,
		uint_fast8_t *lc,
		const uint8_t c);
static int_fast8_t lzmadec_header_dictionary (
		uint_fast32_t *size,
		const uint8_t *buffer);
static void lzmadec_header_uncompressed (
		uint_fast64_t *size,
		int_fast8_t *is_streamed,
		const uint8_t *buffer);


/******************
  extern functions
 ******************/

/* This function doesn't do much but it's here to be as close to zlib
   as possible. See lzmadec_internal_init for actual initialization. */
extern int_fast8_t
lzmadec_init (lzmadec_stream *strm)
{
	/* Set the functions */
	if (strm->lzma_alloc == NULL)
		strm->lzma_alloc = lzmadec_alloc;
	if (strm->lzma_free == NULL)
		strm->lzma_free = lzmadec_free;
	strm->total_in = 0;
	strm->total_out = 0;

	/* Allocate memory for internal state structure */
	strm->state = (lzmadec_state*)((strm->lzma_alloc)(strm->opaque, 1,
			sizeof (lzmadec_state)));
	if (strm->state == NULL)
		return LZMADEC_MEM_ERROR;
	/* We will allocate memory and put the pointers in probs and
	   dictionary later. Before that, make it clear that they contain
	   no valid pointer yet. */
	STATE->probs = NULL;
	STATE->dictionary = NULL;

	/* Mark that the decoding engine is not yet initialized. */
	STATE->status = LZMADEC_STATUS_UNINITIALIZED;

	/* Initialize the internal data if there is enough input available */
	if (strm->avail_in >= LZMA_MINIMUM_COMPRESSED_FILE_SIZE) {
		return (lzmadec_internal_init (strm));
	}

	return LZMADEC_OK;
}

extern int_fast8_t
lzmadec_decode (lzmadec_stream *strm, const int_fast8_t finish_decoding)
{
	switch (STATE->status) {
		case LZMADEC_STATUS_UNINITIALIZED:
			if (strm->avail_in < LZMA_MINIMUM_COMPRESSED_FILE_SIZE)
				return LZMADEC_BUF_ERROR;
			if (lzmadec_internal_init (strm) != LZMADEC_OK)
				return LZMADEC_HEADER_ERROR;
			/* Fall through */
		case LZMADEC_STATUS_RUNNING:
			/* */
			if (strm->total_out < STATE->uncompressed_size)
				break;
			if (strm->total_out > STATE->uncompressed_size)
				return LZMADEC_DATA_ERROR;
			STATE->status = LZMADEC_STATUS_STREAM_END;
			/* Fall through */
		case LZMADEC_STATUS_FINISHING:
			/* Sanity check */
			if (!finish_decoding)
				return LZMADEC_SEQUENCE_ERROR;
			if (strm->total_out > STATE->uncompressed_size)
				return LZMADEC_DATA_ERROR;
			if (strm->total_out <  STATE->uncompressed_size)
				break;
			/* Fall through */
		case LZMADEC_STATUS_STREAM_END:
			return LZMADEC_STREAM_END;
		case LZMADEC_STATUS_ERROR:
		default:
			return LZMADEC_SEQUENCE_ERROR;
	}
	/* Let's decode! */
	return (lzmadec_decode_main(strm, finish_decoding));
}

extern int_fast8_t
lzmadec_end (lzmadec_stream *strm)
{
	(strm->lzma_free)(strm->opaque, STATE->dictionary);
	STATE->dictionary = NULL;
	(strm->lzma_free)(strm->opaque, STATE->probs);
	STATE->probs = NULL;
	(strm->lzma_free)(strm->opaque, strm->state);
	strm->state = NULL;
	return LZMADEC_OK;
}

extern int_fast8_t
lzmadec_buffer_info (lzmadec_info *info, const uint8_t *buffer,
	const size_t len)
{
	/* LZMA header is 13 bytes long. */
	if (len < 13)
		return LZMADEC_BUF_ERROR;
	if (lzmadec_header_properties (&info->pb, &info->lp, &info->lc,
			buffer[0]) != LZMADEC_OK)
		return LZMADEC_HEADER_ERROR;
	if (LZMADEC_OK != lzmadec_header_dictionary (
			&info->dictionary_size, buffer + 1))
		return LZMADEC_HEADER_ERROR;
	lzmadec_header_uncompressed (&info->uncompressed_size,
			&info->is_streamed, buffer + 5);
	return LZMADEC_OK;
}


/*******************
  Memory allocation
 *******************/

/* Default function for allocating memory */
static void *
lzmadec_alloc (void *opaque,
	size_t nmemb, size_t size)
{
	return (malloc (nmemb * size)); /* No need to zero the memory. */
}

/* Default function for freeing memory */
static void
lzmadec_free (void *opaque, void *addr)
{
	free (addr);
}


/****************
  Header parsing
 ****************/

/* Parse the properties byte */
static int_fast8_t
lzmadec_header_properties (
	uint_fast8_t *pb, uint_fast8_t *lp, uint_fast8_t *lc, const uint8_t c)
{
	/* pb, lp and lc are encoded into a single byte. */
	if (c > (9 * 5 * 5))
		return LZMADEC_HEADER_ERROR;
	*pb = c / (9 * 5);        /* 0 <= pb <= 4 */
	*lp = (c % (9 * 5)) / 9;  /* 0 <= lp <= 4 */
	*lc = c % 9;              /* 0 <= lc <= 8 */
	assert (*pb < 5 && *lp < 5 && *lc < 9);
	return LZMADEC_OK;
}

/* Parse the dictionary size (4 bytes, little endian) */
static int_fast8_t
lzmadec_header_dictionary (uint_fast32_t *size, const uint8_t *buffer)
{
	uint_fast32_t i;
	*size = 0;
	for (i = 0; i < 4; i++)
		*size += (uint_fast32_t)(*buffer++) << (i * 8);
	/* The dictionary size is limited to 256 MiB (checked from
	   LZMA SDK 4.30) */
	if (*size > (1 << 28))
		return LZMADEC_HEADER_ERROR;
	return LZMADEC_OK;
}

/* Parse the uncompressed size field (8 bytes, little endian) */
static void
lzmadec_header_uncompressed (uint_fast64_t *size, int_fast8_t *is_streamed,
	const uint8_t *buffer)
{
	/* Streamed files have all 64 bits set in the size field.
	   We don't know the uncompressed size beforehand. */
	*is_streamed = 1; /* Assume streamed. */
	*size = 0;
	uint_fast32_t i;
	for (i = 0; i < 8; i++) {
		*size += (uint_fast64_t)buffer[i] << (i * 8);
		if (buffer[i] != 255)
			*is_streamed = 0;
	}
	assert ((*is_streamed == 1 && *size == UINT64_MAX)
			|| (*is_streamed == 0 && *size < UINT64_MAX));
}

/* Because the LZMA decoder cannot be initialized in practice by
   lzmadec_decode_init(), lzmadec_internal_init()
   is run when lzmadec_decompress() is called the first time.
   lzmadec_decompress() provides the FIXME FIXME FIXME
   is because initialization needs to know how much to allocate memory.
   This function reads the first 18 (LZMA_MINIMUM_COMPRESSED_FILE_SIZE)
   bytes of an LZMA stream, parses it, allocates the required memory and
   initializes the internal variables to a good values. 18 bytes is also
   the size of the smallest possible LZMA encoded stream. */
static int_fast8_t
lzmadec_internal_init (lzmadec_stream *strm)
{
	uint_fast32_t i;
	uint32_t num_probs;

	/* Make sure we have been called sanely */
	if (STATE->probs != NULL || STATE->dictionary != NULL
			|| STATE->status != LZMADEC_STATUS_UNINITIALIZED)
		return LZMADEC_SEQUENCE_ERROR;

	/* Check that we have enough input */
	if (strm->avail_in < LZMA_MINIMUM_COMPRESSED_FILE_SIZE)
		return LZMADEC_BUF_ERROR;

	/* Parse the header (13 bytes) */
	/* - Properties (the first byte) */
	if (lzmadec_header_properties (&STATE->pb, &STATE->lp, &STATE->lc,
			*strm->next_in) != LZMADEC_OK)
		return LZMADEC_HEADER_ERROR;

	strm->next_in++;
	strm->avail_in--;
	/* - Calculate these right away: */
	STATE->pos_state_mask = (1 << STATE->pb) - 1;
	STATE->literal_pos_mask = (1 << STATE->lp) - 1;
	/* - Dictionary size */
	lzmadec_header_dictionary (&STATE->dictionary_size, strm->next_in);
	strm->next_in += 4;
	strm->avail_in -= 4;
	/* - Uncompressed size */
	lzmadec_header_uncompressed (&STATE->uncompressed_size,
			&STATE->streamed, strm->next_in);
	strm->next_in += 8;
	strm->avail_in -= 8;

	/* Allocate memory for internal data */
	const size_t lzmadec_num_probs = (LZMA_BASE_SIZE
			+ (LZMA_LIT_SIZE << (STATE->lc + STATE->lp)));
	STATE->probs = (CProb *)((strm->lzma_alloc)(strm->opaque, 1,
			lzmadec_num_probs * sizeof(CProb)));
	if (STATE->probs == NULL)
		return LZMADEC_MEM_ERROR;

	/* When dictionary_size == 0, it must be set to 1. */
	if (STATE->dictionary_size == 0)
		STATE->dictionary_size = 1;
	/* Allocate dictionary */
	STATE->dictionary = (unsigned char*)((strm->lzma_alloc)(
			strm->opaque, 1, STATE->dictionary_size));
	if (STATE->dictionary == NULL) {
		/* First free() the memory allocated for internal data */
		(strm->lzma_free)(strm->opaque, STATE->probs);
		return LZMADEC_MEM_ERROR;
	}

	/* Initialize the internal data */
	num_probs = LZMA_BASE_SIZE
			+ ((CProb)LZMA_LIT_SIZE << (STATE->lc + STATE->lp));
	for (i = 0; i < num_probs; i++)
		STATE->probs[i] = 1024; /* LZMA_BIT_MODEL_TOTAL >> 1; */

	/* Read the first five bytes of data and initialize STATE->code */
	STATE->code = 0;
	for (i = 0; i < 5; i++)
		STATE->code = (STATE->code << 8) | (uint32_t)(*strm->next_in++);
	strm->avail_in -= 5;

	/* Zero the buffer[] */
	memset (STATE->buffer, 0,
			LZMA_IN_BUFFER_SIZE + LZMA_REQUIRED_IN_BUFFER_SIZE);

	/* Set the initial static values */
	STATE->rep0 = 1;
	STATE->rep1 = 1;
	STATE->rep2 = 1;
	STATE->rep3 = 1;
	STATE->state = 0;
	strm->total_out = 0;
	STATE->distance_limit = 0;
	STATE->dictionary_position = 0;
	STATE->dictionary[STATE->dictionary_size - 1] = 0;
	STATE->buffer_size = 0;
	STATE->buffer_position = STATE->buffer;
	STATE->len = 0;
	STATE->range = 0xFFFFFFFF;

	/* Mark that initialization has been done */
	STATE->status = LZMADEC_STATUS_RUNNING;

	return LZMADEC_OK;
}


/*********************
  LZMA decoder engine
 *********************/

/* Have a nice day! */

#define RC_NORMALIZE \
		if (range < LZMA_TOP_VALUE) { \
			range <<= 8; \
			code = (code << 8) | *buffer++; \
		}

#define IfBit0(p) \
		RC_NORMALIZE; \
		bound = (range >> LZMA_NUM_BIT_MODEL_TOTAL_BITS) * *(p); \
		if (code < bound)

#define UpdateBit0(p) \
		range = bound; \
		*(p) += (LZMA_BIT_MODEL_TOTAL - *(p)) >> LZMA_NUM_MOVE_BITS;

#define UpdateBit1(p) \
		range -= bound; \
		code -= bound; \
		*(p) -= (*(p)) >> LZMA_NUM_MOVE_BITS;

#define RC_GET_BIT2(p, mi, A0, A1) \
		IfBit0(p) { \
			UpdateBit0(p); \
			mi <<= 1; \
			A0; \
		} else { \
			UpdateBit1(p); \
			mi = (mi + mi) + 1; \
			A1; \
		}

#define RC_GET_BIT(p, mi) RC_GET_BIT2(p, mi, ; , ;)

#define RangeDecoderBitTreeDecode(probs, numLevels, res) \
		{ \
			int i = numLevels; \
			res = 1; \
			do { \
				CProb *p = probs + res; \
				RC_GET_BIT(p, res) \
			} while(--i != 0); \
			res -= (1 << numLevels); \
		}

static inline int_fast8_t
lzmadec_decode_main (lzmadec_stream *strm, const int_fast8_t finish_decoding)
{
	/* Split the *strm structure to separate _local_ variables.
	   This improves readability a little. The major reason to do
	   this is performance; at least with GCC 3.4.4 this makes
	   the code about 30% faster! */
	/* strm-> */
	unsigned char *next_out = strm->next_out;
	unsigned char *next_in = strm->next_in;
	size_t avail_in = strm->avail_in;
	uint64_t total_out = strm->total_out;
	/* strm->state-> */
	const int_fast8_t lc = STATE->lc;
	const uint32_t pos_state_mask = STATE->pos_state_mask;
	const uint32_t literal_pos_mask = STATE->literal_pos_mask;
	const uint32_t dictionary_size = STATE->dictionary_size;
	unsigned char *dictionary = STATE->dictionary;
/*	int_fast8_t streamed;*/ /* boolean */
	CProb *p = STATE->probs;
 	uint32_t range = STATE->range;
 	uint32_t code = STATE->code;
	uint32_t dictionary_position = STATE->dictionary_position;
	uint32_t distance_limit = STATE->distance_limit;
	uint32_t rep0 = STATE->rep0;
	uint32_t rep1 = STATE->rep1;
	uint32_t rep2 = STATE->rep2;
	uint32_t rep3 = STATE->rep3;
	int state = STATE->state;
	int len = STATE->len;
	unsigned char *buffer_start = STATE->buffer;
	size_t buffer_size = STATE->buffer_size;
	/* Other variable initializations */
	int_fast8_t i; /* Temporary variable for loop indexing */
	unsigned char *next_out_end = next_out + strm->avail_out;
	unsigned char *buffer = STATE->buffer_position;

	/* This should have been verified in lzmadec_decode() already: */
	assert (STATE->uncompressed_size > total_out);
	/* With non-streamed LZMA stream the output has to be limited. */
	if (STATE->uncompressed_size - total_out < strm->avail_out) {
		next_out_end = next_out + (STATE->uncompressed_size - total_out);
	}

	/* The main loop */
	while (1) {
assert (len >= 0);
assert (state >= 0);
		/* Copy uncompressed data to next_out: */
		{
			unsigned char *foo = next_out;
			while (len != 0 && next_out != next_out_end) {
				uint32_t pos = dictionary_position - rep0;
				if (pos >= dictionary_size)
					pos += dictionary_size;
				*next_out++ = dictionary[dictionary_position] = dictionary[pos];
				if (++dictionary_position == dictionary_size)
					dictionary_position = 0;
				len--;
			}
			total_out += next_out - foo;
		}

		/* Fill the internal input buffer: */
		{
			size_t avail_buf;
			/* Check for overflow (invalid input) */
			if (buffer > buffer_start + LZMA_IN_BUFFER_SIZE)
				return LZMADEC_DATA_ERROR;
			/* Calculate how much data is unread in the buffer: */
			avail_buf = buffer_size - (buffer - buffer_start);

			/* Copy more data to the buffer if needed: */
			if (avail_buf < LZMA_REQUIRED_IN_BUFFER_SIZE) {
				const size_t copy_size = MIN (avail_in,
						LZMA_IN_BUFFER_SIZE - avail_buf);
				if (avail_buf > 0)
					memmove (buffer_start, buffer, avail_buf);
				memcpy (buffer_start + avail_buf,
						next_in, copy_size);
				buffer = buffer_start;
				next_in += copy_size;
				avail_in -= copy_size;
				buffer_size = avail_buf + copy_size;
			}
		}

		/* Decoder cannot continue if there is
		   - no output space available
		   - less data in the input buffer than a single decoder pass
		     could consume; decoding is still continued if the callee
		     has marked that all available input data has been given. */
		if ((next_out == next_out_end)
				|| (!finish_decoding
				&& buffer_size < LZMA_REQUIRED_IN_BUFFER_SIZE))
			break;

		assert (STATE->status != LZMADEC_STATUS_FINISHING);

		/* The rest of the main loop can at maximum
		   - read at maximum of LZMA_REQUIRED_IN_BUFFER_SIZE bytes
		     from the buffer[]
		   - write one byte to next_out. */
		{
			CProb *prob;
			uint32_t bound;
			int_fast32_t posState = (int_fast32_t)(total_out & pos_state_mask);
			prob = p + LZMA_IS_MATCH + (state << LZMA_NUM_POS_BITS_MAX) + posState;
			IfBit0(prob) {
				int_fast32_t symbol = 1;
				UpdateBit0(prob)
				prob = p + LZMA_LITERAL + (LZMA_LIT_SIZE *
					(((total_out & literal_pos_mask) << lc)
					+ ((dictionary_position != 0
					? dictionary[dictionary_position - 1]
					: dictionary[dictionary_size - 1])
					>> (8 - lc))));
				if (state >= LZMA_NUM_LIT_STATES) {
					int_fast32_t matchByte;
					uint32_t pos = dictionary_position - rep0;
					if (pos >= dictionary_size)
						pos += dictionary_size;
					matchByte = dictionary[pos];
					do {
						int_fast32_t bit;
						CProb *probLit;
						matchByte <<= 1;
						bit = (matchByte & 0x100);
						probLit = prob + 0x100 + bit + symbol;
						RC_GET_BIT2(probLit, symbol,
							if (bit != 0) break,
							if (bit == 0) break)
					} while (symbol < 0x100);
				}
				while (symbol < 0x100) {
					CProb *probLit = prob + symbol;
					RC_GET_BIT(probLit, symbol)
				}

				if (distance_limit < dictionary_size)
					distance_limit++;

				/* Eliminate? */
				*next_out++ = dictionary[dictionary_position]
						= (char)symbol;
				if (++dictionary_position == dictionary_size)
					dictionary_position = 0;
				total_out++;

				if (state < 4)
					state = 0;
				else if (state < 10)
					state -= 3;
				else
					state -= 6;

				continue;
			}

			UpdateBit1(prob);
			prob = p + LZMA_IS_REP + state;
			IfBit0(prob) {
				UpdateBit0(prob);
				rep3 = rep2;
				rep2 = rep1;
				rep1 = rep0;
				state = state < LZMA_NUM_LIT_STATES ? 0 : 3;
				prob = p + LZMA_LEN_CODER;
			} else {
				UpdateBit1(prob);
				prob = p + LZMA_IS_REP_G0 + state;
				IfBit0(prob) {
					UpdateBit0(prob);
					prob = p + LZMA_IS_REP0_LONG + (state
							<< LZMA_NUM_POS_BITS_MAX)
							+ posState;
					IfBit0(prob) {
						UpdateBit0(prob);
						if (distance_limit == 0)
							return LZMADEC_DATA_ERROR;
						if (distance_limit < dictionary_size)
							distance_limit++;
						state = state < LZMA_NUM_LIT_STATES ? 9 : 11;
						len++;
						continue;
					} else {
						UpdateBit1(prob);
					}
				} else {
					uint32_t distance;
					UpdateBit1(prob);
					prob = p + LZMA_IS_REP_G1 + state;
					IfBit0(prob) {
						UpdateBit0(prob);
						distance = rep1;
					} else {
						UpdateBit1(prob);
						prob = p + LZMA_IS_REP_G2 + state;
						IfBit0(prob) {
							UpdateBit0(prob);
							distance = rep2;
						} else {
							UpdateBit1(prob);
							distance = rep3;
							rep3 = rep2;
						}
						rep2 = rep1;
					}
					rep1 = rep0;
					rep0 = distance;
				}
				state = state < LZMA_NUM_LIT_STATES ? 8 : 11;
				prob = p + LZMA_REP_LEN_CODER;
			}

			{
				int_fast32_t numBits, offset;
				CProb *probLen = prob + LZMA_LEN_CHOICE;
				IfBit0(probLen) {
					UpdateBit0(probLen);
					probLen = prob + LZMA_LEN_LOW
							+ (posState
							<< LZMA_LEN_NUM_LOW_BITS);
					offset = 0;
					numBits = LZMA_LEN_NUM_LOW_BITS;
				} else {
					UpdateBit1(probLen);
					probLen = prob + LZMA_LEN_CHOICE2;
					IfBit0(probLen) {
						UpdateBit0(probLen);
						probLen = prob + LZMA_LEN_MID
							+ (posState
							<< LZMA_LEN_NUM_MID_BITS);
						offset = LZMA_LEN_NUM_LOW_SYMBOLS;
						numBits = LZMA_LEN_NUM_MID_BITS;
					} else {
						UpdateBit1(probLen);
						probLen = prob + LZMA_LEN_HIGH;
						offset = LZMA_LEN_NUM_LOW_SYMBOLS
							+ LZMA_LEN_NUM_MID_SYMBOLS;
						numBits = LZMA_LEN_NUM_HIGH_BITS;
					}
				}
				RangeDecoderBitTreeDecode(probLen, numBits, len);
				len += offset;
			}

			if (state < 4) {
				int_fast32_t posSlot;
				state += LZMA_NUM_LIT_STATES;
				prob = p + LZMA_POS_SLOT + (MIN (len,
						LZMA_NUM_LEN_TO_POS_STATES - 1)
						<< LZMA_NUM_POS_SLOT_BITS);
				RangeDecoderBitTreeDecode(prob, LZMA_NUM_POS_SLOT_BITS, posSlot);
				if (posSlot >= LZMA_START_POS_MODEL_INDEX) {
					int_fast32_t numDirectBits = ((posSlot >> 1) - 1);
					rep0 = (2 | ((uint32_t)posSlot & 1));
					if (posSlot < LZMA_END_POS_MODEL_INDEX) {
						rep0 <<= numDirectBits;
						prob = p + LZMA_SPEC_POS + rep0 - posSlot - 1;
					} else {
						numDirectBits -= LZMA_NUM_ALIGN_BITS;
						do {
							RC_NORMALIZE
							range >>= 1;
							rep0 <<= 1;
							if (code >= range) {
								code -= range;
								rep0 |= 1;
							}
						} while (--numDirectBits != 0);
						prob = p + LZMA_ALIGN;
						rep0 <<= LZMA_NUM_ALIGN_BITS;
						numDirectBits = LZMA_NUM_ALIGN_BITS;
					}
					{
						i = 1;
						int_fast32_t mi = 1;
						do {
							CProb *prob3 = prob + mi;
							RC_GET_BIT2(prob3, mi, ; , rep0 |= i);
							i <<= 1;
						} while(--numDirectBits != 0);
					}
				} else {
					rep0 = posSlot;
				}
				if (++rep0 == (uint32_t)(0)) {
					/* End of stream marker detected */
					STATE->status = LZMADEC_STATUS_STREAM_END;
					break;
				}
			}

			if (rep0 > distance_limit)
				return LZMADEC_DATA_ERROR;

			len += LZMA_MATCH_MIN_LEN;
			if (dictionary_size - distance_limit > (uint32_t)(len))
				distance_limit += len;
			else
				distance_limit = dictionary_size;
		}
	}
	RC_NORMALIZE;

	if (STATE->uncompressed_size < total_out) {
		STATE->status = LZMADEC_STATUS_ERROR;
		return LZMADEC_DATA_ERROR;
	}

	/* Store the saved values back to the lzmadec_stream structure. */
	strm->total_in += (strm->avail_in - avail_in);
	strm->total_out = total_out;
	strm->avail_in = avail_in;
	strm->avail_out -= (next_out - strm->next_out);
	strm->next_in = next_in;
	strm->next_out = next_out;
	STATE->range = range;
	STATE->code = code;
	STATE->rep0 = rep0;
	STATE->rep1 = rep1;
	STATE->rep2 = rep2;
	STATE->rep3 = rep3;
	STATE->state = state;
	STATE->len = len;
	STATE->dictionary_position = dictionary_position;
	STATE->distance_limit = distance_limit;
	STATE->buffer_size = buffer_size;
	STATE->buffer_position = buffer;

	if (STATE->status == LZMADEC_STATUS_STREAM_END
			|| STATE->uncompressed_size == total_out) {
		STATE->status = LZMADEC_STATUS_STREAM_END;
		if (len == 0)
			return LZMADEC_STREAM_END;
	}
	return LZMADEC_OK;
}