private InetAddress parseIPv4Address(String host) throws UnknownHostException {
if (host == null) {
return null;
}
String[] quad = Tokenizer.parseTokens(host, '.');
if ((quad == null) || (quad.length != 4)) {
return null;
}
byte[] addr = new byte[4];
for (int i = 0; i < 4; i++) {
int part = 0;
if ((quad[i].length() == 0) || (quad[i].length() > 3)) {
return null;
}
for (int k = 0; k < quad[i].length(); k++) {
char c = quad[i].charAt(k);
/* No, Character.isDigit is not the same */
if ((c < '0') || (c > '9')) {
return null;
}
part = part * 10 + (c - '0');
}
if (part > 255) /* 300.1.2.3 is invalid =) */ {
return null;
}
addr[i] = (byte) part;
}
return InetAddress.getByAddress(host, addr);
}
public String[] readNameList() throws IOException {
return Tokenizer.parseTokens(readString(), ',');
}