bool to_currency(Currency& currency, std::string const& code)
{
if (code.empty () || !code.compare (systemCurrencyCode()))
{
currency = beast::zero;
return true;
}
static const int CURRENCY_CODE_LENGTH = 3;
if (code.size () == CURRENCY_CODE_LENGTH)
{
Blob codeBlob (CURRENCY_CODE_LENGTH);
std::transform (code.begin (), code.end (), codeBlob.begin (),
[](auto c)
{
return ::toupper(static_cast<unsigned char>(c));
});
Serializer s;
s.addZeros (96 / 8);
s.addRaw (codeBlob);
s.addZeros (16 / 8);
s.addZeros (24 / 8);
s.get160 (currency, 0);
return true;
}
if (40 == code.size ())
return currency.SetHex (code);
return false;
}
std::string to_string(Currency const& currency)
{
static Currency const sIsoBits ("FFFFFFFFFFFFFFFFFFFFFFFF000000FFFFFFFFFF");
// Characters we are willing to allow in the ASCII representation of a
// three-letter currency code.
static std::string const allowed_characters =
"abcdefghijklmnopqrstuvwxyz"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"0123456789"
"<>(){}[]|?!@#$%^&*";
if (currency == zero)
return systemCurrencyCode();
if (currency == vbcCurrency())
return systemCurrencyCodeVBC();
if (currency == noCurrency())
return "1";
if ((currency & sIsoBits).isZero ())
{
// The offset of the 3 character ISO code in the currency descriptor
int const isoOffset = 12;
std::string const iso(
currency.data () + isoOffset,
currency.data () + isoOffset + 3);
// Specifying the system currency code using ISO-style representation
// is not allowed.
if ((iso != systemCurrencyCode()) && (iso != systemCurrencyCodeVBC()) &&
(iso.find_first_not_of (allowed_characters) == std::string::npos))
{
return iso;
}
}
return strHex (currency.begin (), currency.size ());
}