Example usage for io.netty.buffer ByteBuf getUnsignedMediumLE

Introduction

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

Prototype

public abstract int getUnsignedMediumLE(int index);

Source Link

Document

Gets an unsigned 24-bit medium integer at the specified absolute index in this buffer in Little Endian Byte Order.

Usage

From source file:org.traccar.protocol.At2000FrameDecoder.java

License:Apache License

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

    if (buf.readableBytes() < 5) {
        return null;
    }//from  ww  w. ja  va2  s.c  om

    int length;
    if (firstPacket) {
        firstPacket = false;
        length = buf.getUnsignedMediumLE(buf.readerIndex() + 2);
    } else {
        length = buf.getUnsignedMediumLE(buf.readerIndex() + 1);
    }

    length += BLOCK_LENGTH;
    if (length % BLOCK_LENGTH != 0) {
        length = (length / BLOCK_LENGTH + 1) * BLOCK_LENGTH;
    }

    if ((buf.readableBytes() >= length || buf.readableBytes() % ACK_LENGTH == 0)
            && (buf != currentBuffer || buf.readableBytes() > acknowledgedBytes)) {
        sendResponse(channel);
        currentBuffer = buf;
        acknowledgedBytes = buf.readableBytes();
    }

    if (buf.readableBytes() >= length) {
        return buf.readRetainedSlice(length);
    }

    return null;
}

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