ra8_rar5.h

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#pragma once
 
#include <stddef.h>
#include <stdint.h>
 
#include "ra8_err.h"
#include "ra8_rar.h"
 
#ifdef __cplusplus
extern "C" {
#endif

typedef enum : uint16_t {
  k_ra8_rar5_nc            = 306U, 
  k_ra8_rar5_dc            = 64U,  
  k_ra8_rar5_ldc           = 16U,  
  k_ra8_rar5_rc            = 44U,  
  k_ra8_rar5_bc            = 20U,  
  k_ra8_rar5_huff_total    = 430U, 
  k_ra8_rar5_max_filters   = 16U,  
  k_ra8_rar5_refill_bytes  = 512U, 
  k_ra8_rar5_delta_scratch = 512U, 
  k_ra8_rar5_old_dist      = 4U,   
} ra8_rar5_dims_t;

typedef struct {
  uint32_t len[16];            
  uint32_t pos[16];            
  uint16_t num[k_ra8_rar5_nc]; 
  uint16_t max;                
} ra8_rar5_dtab_t;

typedef struct {
  uint64_t start;    
  uint32_t len;      
  uint8_t  type;     
  uint8_t  channels; 
} ra8_rar5_filter_t;

typedef enum : uint8_t {
  k_ra8_rar5_filter_delta = 0U, 
  k_ra8_rar5_filter_e8    = 1U, 
  k_ra8_rar5_filter_e8e9  = 2U, 
  k_ra8_rar5_filter_arm   = 3U, 
} ra8_rar5_filter_kind_t;

typedef struct ra8_rar5_state {
  ra8_rar5_dtab_t bd;  
  ra8_rar5_dtab_t ld;  
  ra8_rar5_dtab_t dd;  
  ra8_rar5_dtab_t ldd; 
  ra8_rar5_dtab_t rd;  
 
  const ra8_rar_t* rar;                             
  uint64_t         base;                            
  uint64_t         packlen;                         
  uint64_t         fetched;                         
  uint64_t         consumed;                        
  uint64_t         acc;                             
  uint32_t         nbits;                           
  uint8_t          refill[k_ra8_rar5_refill_bytes]; 
  uint32_t         refill_len;                      
  uint32_t         refill_pos;                      
  bool             overrun;                         
 
  uint64_t old_dist[k_ra8_rar5_old_dist]; 
  uint32_t last_length;                   
  bool     tables_ready;                  
 
  ra8_rar5_filter_t filters[k_ra8_rar5_max_filters]; 
  uint16_t          filter_count;                    
  uint8_t           delta[k_ra8_rar5_delta_scratch]; 
} ra8_rar5_state_t;

[[nodiscard]] ra8_err_t ra8_rar5_decompress(const ra8_rar_t*  rar,
                                            uint64_t          data_off,
                                            uint64_t          pack_size,
                                            uint8_t*          out,
                                            size_t            out_cap,
                                            uint64_t          unp_size,
                                            ra8_rar5_state_t* st,
                                            size_t*           got);
 
#ifdef __cplusplus
}
#endif