Method encode

native/cpp/CommonCpp/Tools/Base64.cpp:90–116

namespace comm {

std::string Base64::encode(const std::vector<uint8_t> &data) {
  const auto size = data.size();
  const auto remainder = size % 3;
  const auto baseLength = size - remainder;

  // three bytes are encoded by 4 base64 chars
  std::string encoded;
  encoded.reserve(4 * ceil(size / 3));

  for (std::size_t i = 0; i < baseLength; i += 3) {
    const auto b64_chars = encode_triplet(data[i], data[i + 1], data[i + 2]);
    std::copy(begin(b64_chars), end(b64_chars), back_inserter(encoded));
  }

  if (remainder == 1) {
    const auto b64_chars = encode_triplet(data.back(), 0x00, 0x00);
    encoded.push_back(b64_chars[0]);
    encoded.push_back(b64_chars[1]);
    encoded.append("==");
  } else if (remainder == 2) {
    auto it = data.end() - 2;
    const auto b64_chars = encode_triplet(*it, *(it + 1), 0x00);
    std::copy_n(begin(b64_chars), 3, back_inserter(encoded));
    encoded.push_back('=');
  }
  return encoded;
}

std::vector<uint8_t> Base64::decode(const std::string_view base64String) {
  if (base64String.size() == 0) {