public WsFrameBase(WsSession wsSession, Transformation transformation) {
inputBuffer = new byte[Constants.DEFAULT_BUFFER_SIZE];
messageBufferBinary = ByteBuffer.allocate(wsSession.getMaxBinaryMessageBufferSize());
messageBufferText = CharBuffer.allocate(wsSession.getMaxTextMessageBufferSize());
this.wsSession = wsSession;
Transformation finalTransformation;
if (isMasked()) {
finalTransformation = new UnmaskTransformation();
} else {
finalTransformation = new NoopTransformation();
}
if (transformation == null) {
this.transformation = finalTransformation;
} else {
transformation.setNext(finalTransformation);
this.transformation = transformation;
}
}
/**
* @return <code>true</code> if sufficient data was present to process all of the initial header
*/
private boolean processInitialHeader() throws IOException {
// Need at least two bytes of data to do this
if (writePos - readPos < 2) {
return false;
}
int b = inputBuffer[readPos++];
fin = (b & 0x80) > 0;
rsv = (b & 0x70) >>> 4;
opCode = (byte) (b & 0x0F);
if (!transformation.validateRsv(rsv, opCode)) {
throw new WsIOException(
new CloseReason(
CloseCodes.PROTOCOL_ERROR,
sm.getString("wsFrame.wrongRsv", Integer.valueOf(rsv), Integer.valueOf(opCode))));
}
if (Util.isControl(opCode)) {
if (!fin) {
throw new WsIOException(
new CloseReason(CloseCodes.PROTOCOL_ERROR, sm.getString("wsFrame.controlFragmented")));
}
if (opCode != Constants.OPCODE_PING
&& opCode != Constants.OPCODE_PONG
&& opCode != Constants.OPCODE_CLOSE) {
throw new WsIOException(
new CloseReason(
CloseCodes.PROTOCOL_ERROR,
sm.getString("wsFrame.invalidOpCode", Integer.valueOf(opCode))));
}
} else {
if (continuationExpected) {
if (!Util.isContinuation(opCode)) {
throw new WsIOException(
new CloseReason(CloseCodes.PROTOCOL_ERROR, sm.getString("wsFrame.noContinuation")));
}
} else {
try {
if (opCode == Constants.OPCODE_BINARY) {
// New binary message
textMessage = false;
int size = wsSession.getMaxBinaryMessageBufferSize();
if (size != messageBufferBinary.capacity()) {
messageBufferBinary = ByteBuffer.allocate(size);
}
binaryMsgHandler = wsSession.getBinaryMessageHandler();
textMsgHandler = null;
} else if (opCode == Constants.OPCODE_TEXT) {
// New text message
textMessage = true;
int size = wsSession.getMaxTextMessageBufferSize();
if (size != messageBufferText.capacity()) {
messageBufferText = CharBuffer.allocate(size);
}
binaryMsgHandler = null;
textMsgHandler = wsSession.getTextMessageHandler();
} else {
throw new WsIOException(
new CloseReason(
CloseCodes.PROTOCOL_ERROR,
sm.getString("wsFrame.invalidOpCode", Integer.valueOf(opCode))));
}
} catch (IllegalStateException ise) {
// Thrown if the session is already closed
throw new WsIOException(
new CloseReason(CloseCodes.PROTOCOL_ERROR, sm.getString("wsFrame.sessionClosed")));
}
}
continuationExpected = !fin;
}
b = inputBuffer[readPos++];
// Client data must be masked
if ((b & 0x80) == 0 && isMasked()) {
throw new WsIOException(
new CloseReason(CloseCodes.PROTOCOL_ERROR, sm.getString("wsFrame.notMasked")));
}
payloadLength = b & 0x7F;
state = State.PARTIAL_HEADER;
return true;
}