static int MatchBaseName(int type, const char* name, int nameSz,
                         const char* base, int baseSz)
{
    if (base == NULL || baseSz <= 0 || name == NULL || nameSz <= 0 ||
            name[0] == '.' || nameSz < baseSz ||
            (type != ASN_RFC822_TYPE && type != ASN_DNS_TYPE))
        return 0;

    /* If an email type, handle special cases where the base is only
     * a domain, or is an email address itself. */
    if (type == ASN_RFC822_TYPE) {
        const char* p = NULL;
        int count = 0;

        if (base[0] != '.') {
            p = base;
            count = 0;

            /* find the '@' in the base */
            while (*p != '@' && count < baseSz) {
                count++;
                p++;
            }

            /* No '@' in base, reset p to NULL */
            if (count >= baseSz)
                p = NULL;
        }

        if (p == NULL) {
            /* Base isn't an email address, it is a domain name,
             * wind the name forward one character past its '@'. */
            p = name;
            count = 0;
            while (*p != '@' && count < baseSz) {
                count++;
                p++;
            }

            if (count < baseSz && *p == '@') {
                name = p + 1;
                nameSz -= count + 1;
            }
        }
    }

    if ((type == ASN_DNS_TYPE || type == ASN_RFC822_TYPE) && base[0] == '.') {
        int szAdjust = nameSz - baseSz;
        name += szAdjust;
        nameSz -= szAdjust;
    }

    while (nameSz > 0) {
        if (XTOLOWER((unsigned char)*name++) !=
                                               XTOLOWER((unsigned char)*base++))
            return 0;
        nameSz--;
    }

    return 1;
}
static int MatchBaseName(int type, const char* name, int nameSz,
                         const char* base, int baseSz)
{
    if (base == NULL || baseSz <= 0 || name == NULL || nameSz <= 0 ||
            name[0] == '.' || nameSz < baseSz ||
            (type != ASN_RFC822_TYPE && type != ASN_DNS_TYPE))
        return 0;

     
    if (type == ASN_RFC822_TYPE) {
        const char* p = NULL;
        int count = 0;

        if (base[0] != '.') {
            p = base;
            count = 0;

             
            while (*p != '@' && count < baseSz) {
                count++;
                p++;
            }

             
            if (count >= baseSz)
                p = NULL;
        }

        if (p == NULL) {
             
            p = name;
            count = 0;
            while (*p != '@' && count < baseSz) {
                count++;
                p++;
            }

            if (count < baseSz && *p == '@') {
                name = p + 1;
                nameSz -= count + 1;
            }
        }
    }

    if ((type == ASN_DNS_TYPE || type == ASN_RFC822_TYPE) && base[0] == '.') {
        int szAdjust = nameSz - baseSz;
        name += szAdjust;
        nameSz -= szAdjust;
    }

    while (nameSz > 0) {
        if (XTOLOWER((unsigned char)*name++) !=
                                               XTOLOWER((unsigned char)*base++))
            return 0;
        nameSz--;
    }

    return 1;
}