C++ nsCSubstring::EndReading方法代码示例

bool
net_IsValidHostName(const nsCSubstring &host)
{
    const char *end = host.EndReading();
    // Use explicit whitelists to select which characters we are
    // willing to send to lower-level DNS logic. This is more
    // self-documenting, and can also be slightly faster than the
    // blacklist approach, since DNS names are the common case, and
    // the commonest characters will tend to be near the start of
    // the list.

    // Whitelist for DNS names (RFC 1035) with extra characters added 
    // for pragmatic reasons "$+_"
    // see https://bugzilla.mozilla.org/show_bug.cgi?id=355181#c2
    if (net_FindCharNotInSet(host.BeginReading(), end,
                             "abcdefghijklmnopqrstuvwxyz"
                             ".-0123456789"
                             "ABCDEFGHIJKLMNOPQRSTUVWXYZ$+_") == end)
        return true;

    // Might be a valid IPv6 link-local address containing a percent sign
    nsCAutoString strhost(host);
    PRNetAddr addr;
    return PR_StringToNetAddr(strhost.get(), &addr) == PR_SUCCESS;
}

bool
nsHttpNegotiateAuth::MatchesBaseURI(const nsCSubstring &matchScheme,
                                    const nsCSubstring &matchHost,
                                    PRInt32             matchPort,
                                    const char         *baseStart,
                                    const char         *baseEnd)
{
    // check if scheme://host:port matches baseURI

    // parse the base URI
    const char *hostStart, *schemeEnd = strstr(baseStart, "://");
    if (schemeEnd) {
        // the given scheme must match the parsed scheme exactly
        if (!matchScheme.Equals(Substring(baseStart, schemeEnd)))
            return false;
        hostStart = schemeEnd + 3;
    }
    else
        hostStart = baseStart;

    // XXX this does not work for IPv6-literals
    const char *hostEnd = strchr(hostStart, ':');
    if (hostEnd && hostEnd < baseEnd) {
        // the given port must match the parsed port exactly
        int port = atoi(hostEnd + 1);
        if (matchPort != (PRInt32) port)
            return false;
    }
    else
        hostEnd = baseEnd;


    // if we didn't parse out a host, then assume we got a match.
    if (hostStart == hostEnd)
        return true;

    PRUint32 hostLen = hostEnd - hostStart;

    // matchHost must either equal host or be a subdomain of host
    if (matchHost.Length() < hostLen)
        return false;

    const char *end = matchHost.EndReading();
    if (PL_strncasecmp(end - hostLen, hostStart, hostLen) == 0) {
        // if matchHost ends with host from the base URI, then make sure it is
        // either an exact match, or prefixed with a dot.  we don't want
        // "foobar.com" to match "bar.com"
        if (matchHost.Length() == hostLen ||
            *(end - hostLen) == '.' ||
            *(end - hostLen - 1) == '.')
            return true;
    }

    return false;
}

void ReverseString(const nsCSubstring& source, nsCSubstring& result)
{
  nsACString::const_iterator sourceBegin, sourceEnd;
  source.BeginReading(sourceBegin);
  source.EndReading(sourceEnd);

  result.SetLength(source.Length());
  nsACString::iterator destEnd;
  result.EndWriting(destEnd);

  while (sourceBegin != sourceEnd) {
    *(--destEnd) = *sourceBegin;
    ++sourceBegin;
  }
}

PRBool
IsValidHTTPToken(const nsCSubstring& aToken)
{
    if (aToken.IsEmpty()) {
        return PR_FALSE;
    }

    nsCSubstring::const_char_iterator iter, end;

    aToken.BeginReading(iter);
    aToken.EndReading(end);

    while (iter != end) {
        if (*iter <= 32 ||
                *iter >= 127 ||
                *iter == '(' ||
                *iter == ')' ||
                *iter == '<' ||
                *iter == '>' ||
                *iter == '@' ||
                *iter == ',' ||
                *iter == ';' ||
                *iter == ':' ||
                *iter == '\\' ||
                *iter == '\"' ||
                *iter == '/' ||
                *iter == '[' ||
                *iter == ']' ||
                *iter == '?' ||
                *iter == '=' ||
                *iter == '{' ||
                *iter == '}') {
            return PR_FALSE;
        }
        ++iter;
    }

    return PR_TRUE;
}