Function EncodeBase64

lib/yamlcpp/src/binary.cpp:9–45

    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

std::string EncodeBase64(const unsigned char *data, std::size_t size) {
  const char PAD = '=';

  std::string ret;
  ret.resize(4 * size / 3 + 3);
  char *out = &ret[0];

  std::size_t chunks = size / 3;
  std::size_t remainder = size % 3;

  for (std::size_t i = 0; i < chunks; i++, data += 3) {
    *out++ = encoding[data[0] >> 2];
    *out++ = encoding[((data[0] & 0x3) << 4) | (data[1] >> 4)];
    *out++ = encoding[((data[1] & 0xf) << 2) | (data[2] >> 6)];
    *out++ = encoding[data[2] & 0x3f];
  }

  switch (remainder) {
    case 0:
      break;
    case 1:
      *out++ = encoding[data[0] >> 2];
      *out++ = encoding[((data[0] & 0x3) << 4)];
      *out++ = PAD;
      *out++ = PAD;
      break;
    case 2:
      *out++ = encoding[data[0] >> 2];
      *out++ = encoding[((data[0] & 0x3) << 4) | (data[1] >> 4)];
      *out++ = encoding[((data[1] & 0xf) << 2)];
      *out++ = PAD;
      break;
  }

  ret.resize(out - &ret[0]);
  return ret;
}

static const unsigned char decoding[] = {
    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,