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120 lines
2.7 KiB
120 lines
2.7 KiB
/*
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* Extract RAR archives
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*
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* Copyright (C) 2005-2006 trog@uncon.org
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*
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* This code is based on the work of Alexander L. Roshal (C)
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*
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* The unRAR sources may be used in any software to handle RAR
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* archives without limitations free of charge, but cannot be used
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* to re-create the RAR compression algorithm, which is proprietary.
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* Distribution of modified unRAR sources in separate form or as a
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* part of other software is permitted, provided that it is clearly
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* stated in the documentation and source comments that the code may
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* not be used to develop a RAR (WinRAR) compatible archiver.
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*
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*/
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#ifndef UNRAR_PPM_H
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#define UNRAR_PPM_H 1
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#define N1 4
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#define N2 4
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#define N3 4
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#define N4 26
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#define N_INDEXES 38
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typedef struct rar_mem_blk_tag
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{
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struct rar_mem_blk_tag *next, *prev;
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uint16_t stamp, nu;
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} rar_mem_blk_t;
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struct rar_node
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{
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struct rar_node *next;
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};
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typedef struct sub_allocator_tag
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{
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uint8_t *ptext, *units_start, *heap_end, *fake_units_start;
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uint8_t *heap_start, *lo_unit, *hi_unit;
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long sub_allocator_size;
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struct rar_node free_list[N_INDEXES];
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int16_t indx2units[N_INDEXES], units2indx[128], glue_count;
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} sub_allocator_t;
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typedef struct range_coder_tag
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{
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unsigned int low, code, range;
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unsigned int low_count, high_count, scale;
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}range_coder_t;
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struct ppm_context;
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struct see2_context_tag
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{
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uint16_t summ;
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uint8_t shift, count;
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};
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#ifndef HAVE_ATTRIB_PACKED
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#define __attribute__(x)
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#endif
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#ifdef HAVE_PRAGMA_PACK
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#pragma pack(1)
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#endif
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#ifdef HAVE_PRAGMA_PACK_HPPA
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#pragma pack 1
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#endif
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struct state_tag
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{
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struct ppm_context *successor;
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uint8_t symbol;
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uint8_t freq;
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} __attribute__((packed));
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struct freq_data_tag
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{
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struct state_tag *stats;
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uint16_t summ_freq;
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} __attribute__((packed));
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struct ppm_context {
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struct ppm_context *suffix;
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union {
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struct freq_data_tag u;
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struct state_tag one_state;
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} con_ut;
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uint16_t num_stats;
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} __attribute__((packed));
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#ifdef HAVE_PRAGMA_PACK
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#pragma pack()
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#endif
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#ifdef HAVE_PRAGMA_PACK_HPPA
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#pragma pack
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#endif
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typedef struct ppm_data_tag
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{
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struct state_tag *found_state;
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struct ppm_context *min_context, *max_context;
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struct see2_context_tag see2cont[25][16], dummy_sse2cont;
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int num_masked;
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sub_allocator_t sub_alloc;
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range_coder_t coder;
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int init_esc, order_fall, max_order, run_length, init_rl;
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uint8_t char_mask[256], ns2indx[256], ns2bsindx[256], hb2flag[256];
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uint16_t bin_summ[128][64];
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uint8_t esc_count, prev_success, hi_bits_flag;
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} ppm_data_t;
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void ppm_cleanup(ppm_data_t *ppm_data);
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int ppm_decode_init(ppm_data_t *ppm_data, int fd, struct unpack_data_tag *unpack_data, int *EscChar);
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int ppm_decode_char(ppm_data_t *ppm_data, int fd, struct unpack_data_tag *unpack_data);
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void ppm_constructor(ppm_data_t *ppm_data);
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void ppm_destructor(ppm_data_t *ppm_data);
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#endif
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