private synchronized int expelBuffer(long blockFor) throws IOException {
if (_buffer == null) return 0;
int result = flushBuffer();
_buffer.compact();
if (!_endp.isBlocking()) {
while (_buffer.space() == 0) {
boolean ready = _endp.blockWritable(blockFor);
if (!ready) throw new IOException("Write timeout");
result += flushBuffer();
_buffer.compact();
}
}
return result;
}
public synchronized void addFrame(byte flags, byte opcode, byte[] content, int offset, int length)
throws IOException {
// System.err.printf("<< %s %s
// %s\n",TypeUtil.toHexString(flags),TypeUtil.toHexString(opcode),length);
long blockFor = _endp.getMaxIdleTime();
if (_buffer == null)
_buffer = (_maskGen != null) ? _buffers.getBuffer() : _buffers.getDirectBuffer();
boolean last = WebSocketConnectionD06.isLastFrame(flags);
opcode = (byte) (((0xf & flags) << 4) + 0xf & opcode);
int space = (_maskGen != null) ? 14 : 10;
do {
opcode = _opsent ? WebSocketConnectionD06.OP_CONTINUATION : opcode;
_opsent = true;
int payload = length;
if (payload + space > _buffer.capacity()) {
// We must fragement, so clear FIN bit
opcode &= (byte) 0x7F; // Clear the FIN bit
payload = _buffer.capacity() - space;
} else if (last) opcode |= (byte) 0x80; // Set the FIN bit
// ensure there is space for header
if (_buffer.space() <= space) expelBuffer(blockFor);
// write mask
if ((_maskGen != null)) {
_maskGen.genMask(_mask);
_m = 0;
_buffer.put(_mask);
}
// write the opcode and length
if (payload > 0xffff) {
bufferPut(
new byte[] {
opcode,
(byte) 0x7f,
(byte) 0,
(byte) 0,
(byte) 0,
(byte) 0,
(byte) ((payload >> 24) & 0xff),
(byte) ((payload >> 16) & 0xff),
(byte) ((payload >> 8) & 0xff),
(byte) (payload & 0xff)
});
} else if (payload >= 0x7e) {
bufferPut(new byte[] {opcode, (byte) 0x7e, (byte) (payload >> 8), (byte) (payload & 0xff)});
} else {
bufferPut(opcode);
bufferPut((byte) payload);
}
// write payload
int remaining = payload;
while (remaining > 0) {
_buffer.compact();
int chunk = remaining < _buffer.space() ? remaining : _buffer.space();
if ((_maskGen != null)) {
for (int i = 0; i < chunk; i++) bufferPut(content[offset + (payload - remaining) + i]);
} else _buffer.put(content, offset + (payload - remaining), chunk);
remaining -= chunk;
if (_buffer.space() > 0) {
// Gently flush the data, issuing a non-blocking write
flushBuffer();
} else {
// Forcibly flush the data, issuing a blocking write
expelBuffer(blockFor);
if (remaining == 0) {
// Gently flush the data, issuing a non-blocking write
flushBuffer();
}
}
}
offset += payload;
length -= payload;
} while (length > 0);
_opsent = !last;
}