std::string uri::decode(const std::experimental::string_view input) {
std::string res;
res.reserve(input.size());
for (auto it = input.cbegin(), e = input.cend(); it not_eq e; ++it) {
if (*it == '%') {
if (++it >= e) return decode_error(std::move(res));
const uint8_t nibble1 = (*it);
if (++it >= e) return decode_error(std::move(res));
const uint8_t nibble2 = (*it);
res += static_cast<char>(from_hex(nibble1, nibble2));
} else {
if (is_reserved(*it) or is_unreserved(*it))
res += *it;
else
return decode_error(std::move(res));
}
}
return res;
}
