// :mode=c++:
/*
decode.h - c++ wrapper 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_DECODE_H
#define BASE64_DECODE_H

#define BUFFERSIZE 4096

#include <iostream>

namespace base64 {
extern "C" {
#include <minizinc/_thirdparty/b64/cdecode.h>
}

struct decoder {
  base64_decodestate _state;
  int _buffersize;

  decoder(int buffersize_in = BUFFERSIZE) : _buffersize(buffersize_in) {}

  int decode(char value_in) { return base64_decode_value(value_in); }

  int decode(const char* code_in, const int length_in, char* plaintext_out) {
    return base64_decode_block(code_in, length_in, plaintext_out, &_state);
  }

  void decode(std::istream& istream_in, std::ostream& ostream_in) {
    base64_init_decodestate(&_state);
    //
    const int N = _buffersize;
    char* code = new char[N];
    char* plaintext = new char[N];
    int codelength;
    int plainlength;

    do {
      istream_in.read((char*)code, N);
      codelength = istream_in.gcount();
      plainlength = decode(code, codelength, plaintext);
      ostream_in.write((const char*)plaintext, plainlength);
    } while (istream_in.good() && codelength > 0);
    //
    base64_init_decodestate(&_state);

    delete[] code;
    delete[] plaintext;
  }
};

}  // namespace base64

#endif  // BASE64_DECODE_H
