/*
  *  Extract RAR archives
  *
  *  Copyright (C) 2005 trog@uncon.org
  *
  *  This code is based on the work of Alexander L. Roshal
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
  *  the Free Software Foundation; either version 2 of the License, or
  *  (at your option) any later version.
  *
  *  This program 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 General Public License for more details.
  *
  *  You should have received a copy of the GNU General Public License
  *  along with this program; if not, write to the Free Software

  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  *  MA 02110-1301, USA.

  */
 

 #ifndef UNRAR_PPM_H
 #define UNRAR_PPM_H 1
 

 #include "cltypes.h"

 
 #define N1 4
 #define N2 4
 #define N3 4
 #define N4 26
 #define N_INDEXES 38
 
 typedef struct rar_mem_blk_tag
 {
 	uint16_t stamp, nu;
 	struct rar_mem_blk_tag *next, *prev;
 } rar_mem_blk_t;
 
 struct rar_node
 {
 	struct rar_node *next;
 };
 
 typedef struct sub_allocator_tag
 {
 	long sub_allocator_size;
 	int16_t indx2units[N_INDEXES], units2indx[128], glue_count;
 	uint8_t *heap_start, *lo_unit, *hi_unit;
 	struct rar_node free_list[N_INDEXES];
 	
 	uint8_t *ptext, *units_start, *heap_end, *fake_units_start;
 } sub_allocator_t;
 
 typedef struct range_coder_tag
 {
 	unsigned int low, code, range;
 	unsigned int low_count, high_count, scale;
 }range_coder_t;
 
 struct ppm_context;
 
 struct see2_context_tag
 {
 	uint16_t summ;
 	uint8_t shift, count;
 };
 
 struct state_tag
 {
 	uint8_t symbol;
 	uint8_t freq;
 	struct ppm_context *successor;
 };
 
 struct freq_data_tag
 {
 	uint16_t summ_freq;
 	struct state_tag *stats;
 };
 
 struct ppm_context {
 	uint16_t num_stats;
 	union {
 		struct freq_data_tag u;
 		struct state_tag one_state;
 	} con_ut;
 	struct ppm_context *suffix;
 };
 
 typedef struct ppm_data_tag
 {
 	sub_allocator_t sub_alloc;
 	range_coder_t coder;
 	int num_masked, init_esc, order_fall, max_order, run_length, init_rl;
 	struct ppm_context *min_context, *max_context;
 	struct state_tag *found_state;
 	uint8_t char_mask[256], ns2indx[256], ns2bsindx[256], hb2flag[256];
 	uint8_t esc_count, prev_success, hi_bits_flag;
 	struct see2_context_tag see2cont[25][16], dummy_sse2cont;
 	uint16_t bin_summ[128][64];
 } ppm_data_t;
 
 int ppm_decode_init(ppm_data_t *ppm_data, int fd, struct unpack_data_tag *unpack_data, int *EscChar);
 int ppm_decode_char(ppm_data_t *ppm_data, int fd, struct unpack_data_tag *unpack_data);
 void ppm_constructor(ppm_data_t *ppm_data);
 void ppm_destructor(ppm_data_t *ppm_data);
 
 #endif