Function DecodeThreeChars

tensorflow/core/lib/strings/base64.cc:61–73

}

Status DecodeThreeChars(const char* codes, char* result) {
  const uint32 packed = (Convert(codes[0]) << 18) | (Convert(codes[1]) << 12) |
                        (Convert(codes[2]) << 6) | (Convert(codes[3]));
  // Convert() return value has upper 25 bits set if input is invalid.
  // Therefore `packed` has high bits set iff at least one of code is invalid.
  if (TF_PREDICT_FALSE((packed & 0xFF000000) != 0)) {
    return errors::InvalidArgument("Invalid character found in base64.");
  }
  result[0] = static_cast<char>(packed >> 16);
  result[1] = static_cast<char>(packed >> 8);
  result[2] = static_cast<char>(packed);
  return Status::OK();
}
}  // namespace

Status Base64Decode(StringPiece data, string* decoded) {