unarch_tar_internal.h

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

typedef enum : uint16_t {
  k_ra8_tar_off_name       = 0U,   
  k_ra8_tar_len_name       = 100U, 
  k_ra8_tar_off_size       = 124U, 
  k_ra8_tar_len_size       = 12U,  
  k_ra8_tar_off_chksum     = 148U, 
  k_ra8_tar_len_chksum     = 8U,   
  k_ra8_tar_off_type       = 156U, 
  k_ra8_tar_off_magic      = 257U, 
  k_ra8_tar_len_magic      = 5U,   
  k_ra8_tar_off_magic_term = 262U, 
  k_ra8_tar_off_prefix     = 345U, 
  k_ra8_tar_len_prefix     = 155U, 
} ra8_tar_layout_t;

typedef enum : uint8_t {
  k_ra8_tar_type_file     = 0U, 
  k_ra8_tar_type_dir      = 1U, 
  k_ra8_tar_type_pax      = 2U, 
  k_ra8_tar_type_meta     = 3U, 
  k_ra8_tar_type_longname = 4U, 
  k_ra8_tar_type_other    = 5U, 
} ra8_tar_type_t;

RA8_PRIV [[nodiscard]] ra8_err_t
priv_unarch_tar_num(const uint8_t* field, size_t len, uint64_t* out);

RA8_PRIV [[nodiscard]] bool priv_unarch_tar_block_zero(const uint8_t* block);

RA8_PRIV [[nodiscard]] bool priv_unarch_tar_checksum_ok(const uint8_t* block);

RA8_PRIV [[nodiscard]] bool priv_unarch_tar_magic_ok(const uint8_t* block);

RA8_PRIV [[nodiscard]] ra8_tar_type_t priv_unarch_tar_classify(uint8_t typeflag);

RA8_PRIV [[nodiscard]] ra8_err_t priv_unarch_tar_pax_parse(const uint8_t* data,
                                                           size_t         len,
                                                           char*          name_buf,
                                                           uint16_t       name_cap,
                                                           uint16_t*      name_len,
                                                           bool*          have_path,
                                                           uint64_t*      size_ovr,
                                                           bool*          have_size);
 
#ifdef __cplusplus
}
#endif