Method GetCharacterRef

3rdparty/tinyxml2/tinyxml2.cpp:470–556

const char* XMLUtil::GetCharacterRef(const char* p, char* value, int* length)
{
    // Assume an entity, and pull it out.
    *length = 0;

    static const uint32_t MAX_CODE_POINT = 0x10FFFF;

    if (*(p + 1) == '#' && *(p + 2)) {
        uint32_t ucs = 0;
        ptrdiff_t delta = 0;
        uint32_t mult = 1;
        static const char SEMICOLON = ';';

        bool hex = false;
        uint32_t radix = 10;
        const char* q = 0;
        char terminator = '#';

        if (*(p + 2) == 'x') {
            // Hexadecimal.
            hex = true;
            radix = 16;
            terminator = 'x';

            q = p + 3;
        }
        else {
            // Decimal.
            q = p + 2;
        }
        if (!(*q)) {
            return 0;
        }

        q = strchr(q, SEMICOLON);
        if (!q) {
            return 0;
        }
        TIXMLASSERT(*q == SEMICOLON);

        delta = q - p;
        --q;

        while (*q != terminator) {
            uint32_t digit = 0;

            if (*q >= '0' && *q <= '9') {
                digit = *q - '0';
            }
            else if (hex && (*q >= 'a' && *q <= 'f')) {
                digit = *q - 'a' + 10;
            }
            else if (hex && (*q >= 'A' && *q <= 'F')) {
                digit = *q - 'A' + 10;
            }
            else {
                return 0;
            }