text: /*
  cdecode.h - c header for a base64 decoding algorithm
  
  This is part of the libb64 project, and has been placed in the public domain.
  For details, see http://sourceforge.net/projects/libb64
  */
  
  #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(char 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 */
  