ra8_rar5_internal.h

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#pragma once
 
#include <stddef.h>
#include <stdint.h>
 
#include "ra8_attributes.h"
#include "ra8_err.h"
#include "ra8_rar5.h"
 
#ifdef __cplusplus
extern "C" {
#endif

typedef enum : uint32_t {
  k_r5_bf_mask     = 0xFFFEU, 
  k_r5_nibble_mask = 0x0FU,   
  k_r5_byte_mask   = 0xFFU,   
} r5_mask_t;

typedef enum : uint8_t {
  k_r5_byte_bits  = 8U,  
  k_r5_bf_bits    = 16U, 
  k_r5_maxbits    = 15U, 
  k_r5_len_escape = 15U, 
  k_r5_low3_mask  = 7U,  
  k_r5_acc_bits   = 64U, 
} r5_bits_t;

typedef enum : uint8_t {
  k_r5_bf_bitsize_mask = 0x07U, 
  k_r5_bf_bcount_shift = 3U,    
  k_r5_bf_bcount_mask  = 3U,    
  k_r5_bf_last         = 0x40U, 
  k_r5_bf_tables       = 0x80U, 
  k_r5_hdr_chk_seed    = 0x5AU, 
} r5_blockflag_t;

typedef enum : uint16_t {
  k_r5_sym_filter   = 256U, 
  k_r5_sym_replast  = 257U, 
  k_r5_sym_repdist0 = 258U, 
  k_r5_sym_lenbase  = 262U, 
} r5_mainsym_t;

typedef enum : uint8_t {
  k_r5_tbl_copy_long  = 17U, 
  k_r5_tbl_zero_short = 18U, 
  k_r5_tbl_zero_long  = 19U, 
  k_r5_run_long_bits  = 7U,  
  k_r5_run_long_add   = 11U, 
  k_r5_zeros_extra    = 2U,  
} r5_tblcode_t;

typedef enum : uint32_t {
  k_r5_dist_th1 = 0x100U,   
  k_r5_dist_th2 = 0x2000U,  
  k_r5_dist_th3 = 0x40000U, 
} r5_distth_t;

typedef enum : uint8_t {
  k_r5_ftype_bits = 3U, 
  k_r5_fchan_bits = 5U, 
} r5_filter_t;

typedef enum : uint8_t {
  k_r5_x86_call = 0xE8U, 
  k_r5_x86_jmp  = 0xE9U, 
  k_r5_x86_ilen = 5U,    
  k_r5_arm_bl   = 0xEBU, 
} r5_filterop_t;

typedef enum : uint32_t {
  k_r5_arm_off_mask = 0xFFFFFFU, 
} r5_armmask_t;

typedef enum : uint16_t {
  k_r5_max_pad_bits = 64U, 
} r5_pad_t;

typedef struct {
  uint64_t size;      
  uint32_t last_bits; 
  bool     tables;    
  bool     last;      
} r5_block_t;

RA8_PRIV uint32_t priv_rar5_get(ra8_rar5_state_t* st, uint32_t n);

RA8_PRIV uint32_t priv_rar5_decode_num(ra8_rar5_state_t* st, const ra8_rar5_dtab_t* d);

RA8_PRIV ra8_err_t priv_rar5_read_block_header(ra8_rar5_state_t* st, r5_block_t* b);

RA8_PRIV ra8_err_t priv_rar5_read_tables(ra8_rar5_state_t* st);

RA8_PRIV bool
priv_rar5_copy_match(uint8_t* out, size_t* out_pos, size_t unp, uint32_t length, uint64_t dist);

RA8_PRIV void
priv_rar5_filter_delta(ra8_rar5_state_t* st, uint8_t* d, uint32_t len, uint32_t channels);

RA8_PRIV uint32_t priv_rar5_fill_zeros(uint8_t* out, uint32_t start, uint32_t count, uint32_t max);

RA8_PRIV ra8_err_t priv_rar5_apply_run(ra8_rar5_state_t* st,
                                       uint8_t*          tbl,
                                       uint32_t*         idx,
                                       uint32_t          num);
 
#ifdef __cplusplus
}
#endif