ra8_fs_utf_internal.h

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#pragma once
 
#include <stdint.h>
 
#include "ra8_attributes.h"
#include "ra8_err.h"

typedef enum : uint32_t {
  k_utf_ascii_max     = 0x7FU,     
  k_utf_cont_mask     = 0xC0U,     
  k_utf_cont_tag      = 0x80U,     
  k_utf_cont_payload  = 0x3FU,     
  k_utf_cont_shift    = 6U,        
  k_utf_lead2_mask    = 0xE0U,     
  k_utf_lead2_tag     = 0xC0U,     
  k_utf_lead2_payload = 0x1FU,     
  k_utf_lead3_mask    = 0xF0U,     
  k_utf_lead3_tag     = 0xE0U,     
  k_utf_lead3_payload = 0x0FU,     
  k_utf_lead4_mask    = 0xF8U,     
  k_utf_lead4_tag     = 0xF0U,     
  k_utf_lead4_payload = 0x07U,     
  k_utf_len_1         = 1U,        
  k_utf_len_2         = 2U,        
  k_utf_len_3         = 3U,        
  k_utf_len_4         = 4U,        
  k_utf_min_2byte     = 0x80U,     
  k_utf_min_3byte     = 0x800U,    
  k_utf_min_4byte     = 0x10000U,  
  k_utf_sur_hi_first  = 0xD800U,   
  k_utf_sur_lo_first  = 0xDC00U,   
  k_utf_sur_last      = 0xDFFFU,   
  k_utf_sur_shift     = 10U,       
  k_utf_sur_mask      = 0x3FFU,    
  k_utf_unit_max      = 0xFFFFU,   
  k_utf_code_max      = 0x10FFFFU, 
  k_utf_byte_mask     = 0xFFU,     
  k_utf_byte_shift    = 8U,        
  k_utf8_max_per_unit = 3U,        
} ra8_fs_utf_t;

RA8_PRIV
ra8_err_t priv_utf8_to_utf16(const char* in, uint16_t* out, uint32_t cap, uint32_t* out_units);

RA8_PRIV
ra8_err_t priv_utf16_to_utf8(const uint16_t* in, uint32_t units, char* out, uint32_t cap);

RA8_PRIV
uint8_t priv_utf16_ieq(const uint16_t* a, uint32_t an, const uint16_t* b, uint32_t bn);

RA8_PRIV
uint8_t priv_utf16_all_ascii(const uint16_t* in, uint32_t units);