/****************************************************************************************************************************
  cdecoder.h - c source to a base64 decoding algorithm implementation

  For any WiFi shields, such as WiFiNINA W101, W102, W13x, or custom, such as ESP8266/ESP32-AT, Ethernet, etc

  WiFiWebServer is a library for the ESP32-based WiFi shields to run WebServer
  Forked and modified from ESP8266 https://github.com/esp8266/Arduino/releases
  Forked and modified from Arduino WiFiNINA library https://www.arduino.cc/en/Reference/WiFiNINA
  Built by Khoi Hoang https://github.com/khoih-prog/WiFiWebServer
  Licensed under MIT license

  Original author:
  @file       Esp8266WebServer.h
  @author     Ivan Grokhotkov
 *****************************************************************************************************************************/

#pragma once

// Reintroduce to prevent duplication compile error if other lib/core already has LIB64
// pragma once can't prevent that
#ifndef BASE64_CDECODE_H
#define BASE64_CDECODE_H

#define base64_decode_expected_len(n) ((n * 3) / 4)

#ifdef __cplusplus
extern "C" {
#endif

typedef enum
{
  step_a, step_b, step_c, step_d
} base64_decodestep;

typedef struct
{
  base64_decodestep step;
  char plainchar;
} base64_decodestate;

void base64_init_decodestate(base64_decodestate* state_in);

int base64_decode_value(int value_in);

int base64_decode_block(const char* code_in, const int length_in, char* plaintext_out, base64_decodestate* state_in);

int base64_decode_chars(const char* code_in, const int length_in, char* plaintext_out);

#ifdef __cplusplus
} // extern "C"
#endif

#endif /* BASE64_CDECODE_H */