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///////////////////////////////////////////////////////////////////////////////
//
/// \file lzma_encoder_private.h
/// \brief Private definitions for LZMA encoder
//
// Copyright (C) 1999-2006 Igor Pavlov
// 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_LZMA_ENCODER_PRIVATE_H
#define LZMA_LZMA_ENCODER_PRIVATE_H
#include "lz_encoder.h"
#include "range_encoder.h"
#include "lzma_common.h"
#include "lzma_encoder.h"
// Macro to compare if the first two bytes in two buffers differ. This is
// needed in lzma_lzma_optimum_*() to test if the match is at least
// MATCH_LEN_MIN bytes. Unaligned access gives tiny gain so there's no
// reason to not use it when it is supported.
#ifdef HAVE_FAST_UNALIGNED_ACCESS
# define not_equal_16(a, b) \
(*(const uint16_t *)(a) != *(const uint16_t *)(b))
#else
# define not_equal_16(a, b) \
((a)[0] != (b)[0] || (a)[1] != (b)[1])
#endif
// Optimal - Number of entries in the optimum array.
#define OPTS (1 << 12)
typedef struct {
probability choice;
probability choice2;
probability low[POS_STATES_MAX][LEN_LOW_SYMBOLS];
probability mid[POS_STATES_MAX][LEN_MID_SYMBOLS];
probability high[LEN_HIGH_SYMBOLS];
uint32_t prices[POS_STATES_MAX][LEN_SYMBOLS];
uint32_t table_size;
uint32_t counters[POS_STATES_MAX];
} lzma_length_encoder;
typedef struct {
lzma_lzma_state state;
bool prev_1_is_literal;
bool prev_2;
uint32_t pos_prev_2;
uint32_t back_prev_2;
uint32_t price;
uint32_t pos_prev; // pos_next;
uint32_t back_prev;
uint32_t backs[REP_DISTANCES];
} lzma_optimal;
struct lzma_coder_s {
/// Range encoder
lzma_range_encoder rc;
/// State
lzma_lzma_state state;
/// The four most recent match distances
uint32_t reps[REP_DISTANCES];
/// Array of match candidates
lzma_match matches[MATCH_LEN_MAX + 1];
/// Number of match candidates in matches[]
uint32_t matches_count;
/// Varibale to hold the length of the longest match between calls
/// to lzma_lzma_optimum_*().
uint32_t longest_match_length;
/// True if using getoptimumfast
bool fast_mode;
/// True if the encoder has been initialized by encoding the first
/// byte as a literal.
bool is_initialized;
/// True if the range encoder has been flushed, but not all bytes
/// have been written to the output buffer yet.
bool is_flushed;
uint32_t pos_mask; ///< (1 << pos_bits) - 1
uint32_t literal_context_bits;
uint32_t literal_pos_mask;
// These are the same as in lzma_decoder.c. See comments there.
probability literal[LITERAL_CODERS_MAX][LITERAL_CODER_SIZE];
probability is_match[STATES][POS_STATES_MAX];
probability is_rep[STATES];
probability is_rep0[STATES];
probability is_rep1[STATES];
probability is_rep2[STATES];
probability is_rep0_long[STATES][POS_STATES_MAX];
probability pos_slot[LEN_TO_POS_STATES][POS_SLOTS];
probability pos_special[FULL_DISTANCES - END_POS_MODEL_INDEX];
probability pos_align[ALIGN_TABLE_SIZE];
// These are the same as in lzma_decoder.c except that the encoders
// include also price tables.
lzma_length_encoder match_len_encoder;
lzma_length_encoder rep_len_encoder;
// Price tables
uint32_t pos_slot_prices[LEN_TO_POS_STATES][POS_SLOTS];
uint32_t distances_prices[LEN_TO_POS_STATES][FULL_DISTANCES];
uint32_t dist_table_size;
uint32_t match_price_count;
uint32_t align_prices[ALIGN_TABLE_SIZE];
uint32_t align_price_count;
// Optimal
uint32_t opts_end_index;
uint32_t opts_current_index;
lzma_optimal opts[OPTS];
};
extern void lzma_lzma_optimum_fast(
lzma_coder *restrict coder, lzma_mf *restrict mf,
uint32_t *restrict back_res, uint32_t *restrict len_res);
extern void lzma_lzma_optimum_normal(lzma_coder *restrict coder,
lzma_mf *restrict mf, uint32_t *restrict back_res,
uint32_t *restrict len_res, uint32_t position);
#endif
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