@Override
protected Object decode(ChannelHandlerContext ctx, Channel channel, ChannelBuffer buf)
throws Exception {
if (buf.readableBytes() < 10) {
return null;
}
int beginIndex = buf.indexOf(buf.readerIndex(), buf.writerIndex(), new StringFinder("$$"));
if (beginIndex == -1) {
return null;
} else if (beginIndex > buf.readerIndex()) {
buf.readerIndex(beginIndex);
}
int length;
int flagIndex = buf.indexOf(buf.readerIndex(), buf.writerIndex(), new StringFinder("AA"));
if (flagIndex != -1 && flagIndex - beginIndex == 6) {
length = Integer.parseInt(buf.toString(buf.readerIndex() + 2, 4, Charset.defaultCharset()));
} else {
length =
Integer.parseInt(buf.toString(buf.readerIndex() + 2, 2, Charset.defaultCharset()), 16);
}
if (length <= buf.readableBytes()) {
return buf.readBytes(length);
}
return null;
}
@Override
protected Object decode(ChannelHandlerContext ctx, Channel channel, ChannelBuffer buf)
throws Exception {
char marker = (char) buf.getByte(buf.readerIndex());
while (marker != '*' && marker != '$' && buf.readableBytes() > 0) {
buf.skipBytes(1);
if (buf.readableBytes() > 0) {
marker = (char) buf.getByte(buf.readerIndex());
}
}
if (marker == '*') {
// Return text message
int index = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) '#');
if (index != -1) {
return buf.readBytes(index + 1 - buf.readerIndex());
}
} else if (marker == '$' && buf.readableBytes() >= MESSAGE_LENGTH) {
// Return binary message
return buf.readBytes(MESSAGE_LENGTH);
}
return null;
}
private static String readString(ChannelBuffer buf) {
String result = null;
int index = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) 0);
if (index > buf.readerIndex()) {
result = buf.readBytes(index - buf.readerIndex()).toString(StandardCharsets.US_ASCII);
}
buf.readByte();
return result;
}
@Override
protected Object decode(ChannelHandlerContext ctx, Channel channel, ChannelBuffer buf)
throws Exception {
ChannelBuffer result = (ChannelBuffer) super.decode(ctx, channel, buf);
if (result != null) {
int index = result.indexOf(result.readerIndex(), result.writerIndex(), (byte) '$');
if (index == -1) {
return result;
} else {
result.skipBytes(index);
return result.readBytes(result.readableBytes());
}
}
return null;
}