/** * Helper function that checks whether or not the data could be a SIP message. It is a very basic * check but if it doesn't go through it definitely is not a SIP message. * * @param data * @return */ public static boolean couldBeSipMessage(final Buffer data) throws IOException { final byte a = data.getByte(0); final byte b = data.getByte(1); final byte c = data.getByte(2); return a == 'S' && b == 'I' && c == 'P' || // response a == 'I' && b == 'N' && c == 'V' || // INVITE a == 'A' && b == 'C' && c == 'K' || // ACK a == 'B' && b == 'Y' && c == 'E' || // BYE a == 'O' && b == 'P' && c == 'T' || // OPTIONS a == 'C' && b == 'A' && c == 'N' || // CANCEL a == 'M' && b == 'E' && c == 'S' || // MESSAGE a == 'R' && b == 'E' && c == 'G' || // REGISTER a == 'I' && b == 'N' && c == 'F' || // INFO a == 'P' && b == 'R' && c == 'A' || // PRACK a == 'S' && b == 'U' && c == 'B' || // SUBSCRIBE a == 'N' && b == 'O' && c == 'T' || // NOTIFY a == 'U' && b == 'P' && c == 'D' || // UPDATE a == 'R' && b == 'E' && c == 'F' || // REFER a == 'P' && b == 'U' && c == 'B'; // PUBLISH }
/** * Convenience method for determining whether the method of this message is an ACK or not. Hence, * this is NOT to the method to determine whether this is an ACK Request or not! * * @return true if the method of this message is a ACK, false otherwise. * @throws SipParseException in case the method could not be parsed out of the underlying buffer. */ default boolean isAck() throws SipParseException { final Buffer m = getMethod(); try { return m.getByte(0) == 'A' && m.getByte(1) == 'C' && m.getByte(2) == 'K'; } catch (final IOException e) { throw new SipParseException( 0, UNABLE_TO_PARSE_OUT_THE_METHOD_DUE_TO_UNDERLYING_IO_EXCEPTION, e); } }
/** * Convenience method for determining whether the method of this message is a OPTIONS or not. * Hence, this is NOT to the method to determine whether this is an OPTIONS Request or not! * * @return true if the method of this message is a OPTIONS, false otherwise. * @throws SipParseException in case the method could not be parsed out of the underlying buffer. */ default boolean isOptions() throws SipParseException { final Buffer m = getMethod(); try { return m.getByte(0) == 'O' && m.getByte(1) == 'P' && m.getByte(2) == 'T' && m.getByte(3) == 'I' && m.getByte(4) == 'O' && m.getByte(5) == 'N' && m.getByte(6) == 'S'; } catch (final IOException e) { throw new SipParseException( 0, UNABLE_TO_PARSE_OUT_THE_METHOD_DUE_TO_UNDERLYING_IO_EXCEPTION, e); } }