Function IsHex

extern/nfd/nfd_portal.cpp:945–947

Returns true if ch is in [0-9A-Za-z], false otherwise.

// Returns true if ch is in [0-9A-Za-z], false otherwise.
bool IsHex(char ch) {
    return ('0' <= ch && ch <= '9') || ('A' <= ch && ch <= 'F') || ('a' <= ch && ch <= 'f');
}

// Returns the hexadecimal value contained in the char.  Precondition: IsHex(ch)
char ParseHexUnchecked(char ch) {