Example usage for io.netty.buffer ByteBuf readRetainedSlice

List of usage examples for io.netty.buffer ByteBuf readRetainedSlice

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Introduction

In this page you can find the example usage for io.netty.buffer ByteBuf readRetainedSlice.

Prototype

public abstract ByteBuf readRetainedSlice(int length);

Source Link

Document

Returns a new retained slice of this buffer's sub-region starting at the current readerIndex and increases the readerIndex by the size of the new slice (= length ).

Usage

From source file:org.traccar.protocol.WondexFrameDecoder.java

License:Apache License

@Override
protected Object decode(ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {

    if (buf.readableBytes() < KEEP_ALIVE_LENGTH) {
        return null;
    }// w ww.  jav  a 2s  .  c  o m

    if (buf.getUnsignedByte(buf.readerIndex()) == 0xD0) {

        // Send response
        ByteBuf frame = buf.readRetainedSlice(KEEP_ALIVE_LENGTH);
        if (channel != null) {
            frame.retain();
            channel.writeAndFlush(new NetworkMessage(frame, channel.remoteAddress()));
        }
        return frame;

    } else {

        int index = BufferUtil.indexOf("\r\n", buf);
        if (index != -1) {
            ByteBuf frame = buf.readRetainedSlice(index - buf.readerIndex());
            buf.skipBytes(2);
            return frame;
        }

    }

    return null;
}

From source file:org.traccar.protocol.XexunFrameDecoder.java

License:Apache License

@Override
protected Object decode(ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {

    if (buf.readableBytes() < 80) {
        return null;
    }/*from   w  w  w.ja v a  2 s . c om*/

    int beginIndex = BufferUtil.indexOf("GPRMC", buf);
    if (beginIndex == -1) {
        beginIndex = BufferUtil.indexOf("GNRMC", buf);
        if (beginIndex == -1) {
            return null;
        }
    }

    int identifierIndex = BufferUtil.indexOf("imei:", buf, beginIndex, buf.writerIndex());
    if (identifierIndex == -1) {
        return null;
    }

    int endIndex = buf.indexOf(identifierIndex, buf.writerIndex(), (byte) ',');
    if (endIndex == -1) {
        return null;
    }

    buf.skipBytes(beginIndex - buf.readerIndex());

    return buf.readRetainedSlice(endIndex - beginIndex + 1);
}