Example usage for io.netty.buffer ByteBuf readRetainedSlice

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.AtrackFrameDecoder.java

License:Apache License

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

    if (buf.readableBytes() >= 2) {

        if (buf.getUnsignedShort(buf.readerIndex()) == 0xfe02) {

            if (buf.readableBytes() >= KEEPALIVE_LENGTH) {
                return buf.readRetainedSlice(KEEPALIVE_LENGTH);
            }// ww w. j  av  a  2s  .c o  m

        } else if (buf.getUnsignedShort(buf.readerIndex()) == 0x4050
                && buf.getByte(buf.readerIndex() + 2) != ',') {

            if (buf.readableBytes() > 6) {
                int length = buf.getUnsignedShort(buf.readerIndex() + 4) + 4 + 2;
                if (buf.readableBytes() >= length) {
                    return buf.readRetainedSlice(length);
                }
            }

        } else {

            int lengthStart = buf.indexOf(buf.readerIndex() + 3, buf.writerIndex(), (byte) ',') + 1;
            if (lengthStart > 0) {
                int lengthEnd = buf.indexOf(lengthStart, buf.writerIndex(), (byte) ',');
                if (lengthEnd > 0) {
                    int length = lengthEnd + Integer.parseInt(
                            buf.toString(lengthStart, lengthEnd - lengthStart, StandardCharsets.US_ASCII));
                    if (buf.readableBytes() > length && buf.getByte(buf.readerIndex() + length) == '\n') {
                        length += 1;
                    }
                    if (buf.readableBytes() >= length) {
                        return buf.readRetainedSlice(length);
                    }
                }
            } else {
                int endIndex = BufferUtil.indexOf("\r\n", buf);
                if (endIndex > 0) {
                    return buf.readRetainedSlice(endIndex - buf.readerIndex() + 2);
                }
            }

        }

    }

    return null;
}

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

License:Apache License

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

    // Check minimum length
    if (buf.readableBytes() < 12) {
        return null;
    }//from ww  w. j  a  va 2s .com

    int length;
    switch (buf.getUnsignedByte(buf.readerIndex())) {
    case AutoFonProtocolDecoder.MSG_LOGIN:
        length = 12;
        break;
    case AutoFonProtocolDecoder.MSG_LOCATION:
        length = 78;
        break;
    case AutoFonProtocolDecoder.MSG_HISTORY:
        length = 257;
        break;
    case AutoFonProtocolDecoder.MSG_45_LOGIN:
        length = 19;
        break;
    case AutoFonProtocolDecoder.MSG_45_LOCATION:
        length = 34;
        break;
    default:
        length = 0;
        break;
    }

    // Check length and return buffer
    if (length != 0 && buf.readableBytes() >= length) {
        return buf.readRetainedSlice(length);
    }

    return null;
}

---

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

License:Apache License

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

    if (header && buf.readableBytes() >= HANDSHAKE_LENGTH) {
        buf.skipBytes(HANDSHAKE_LENGTH);
        header = false;// w  w w  . j  a  v  a  2 s  .  co m
    }

    int end = 8; // IMEI

    while (buf.readableBytes() >= end + 2 + 1 + 1 + 1) {
        end += buf.getUnsignedShortLE(buf.readerIndex() + end) + 2;

        if (buf.readableBytes() > end && checksum(buf, end) == buf.getByte(buf.readerIndex() + end)) {
            return buf.readRetainedSlice(end + 1);
        }
    }

    return null;
}

---

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

License:Apache License

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

    if (buf.readableBytes() < MESSAGE_MINIMUM_LENGTH) {
        return null;
    }//from w  ww .  j  ava2  s.  c om

    int length = 0;
    int type = buf.getUnsignedByte(4);
    switch (type) {
    case CellocatorProtocolDecoder.MSG_CLIENT_STATUS:
        length = 70;
        break;
    case CellocatorProtocolDecoder.MSG_CLIENT_PROGRAMMING:
        length = 31;
        break;
    case CellocatorProtocolDecoder.MSG_CLIENT_SERIAL_LOG:
        length = 70;
        break;
    case CellocatorProtocolDecoder.MSG_CLIENT_SERIAL:
        if (buf.readableBytes() >= 19) {
            length = 19 + buf.getUnsignedShortLE(16);
        }
        break;
    case CellocatorProtocolDecoder.MSG_CLIENT_MODULAR:
        length = 15 + buf.getUnsignedByte(13);
        break;
    default:
        break;
    }

    if (length > 0 && buf.readableBytes() >= length) {
        return buf.readRetainedSlice(length);
    }

    return null;
}

---

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

License:Apache License

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

    if (buf.readableBytes() < 10) {
        return null;
    }//  w w  w  .  j  av a  2  s.co  m

    int headerLength = buf.getUnsignedByte(buf.readerIndex() + 3);
    int frameLength = buf.getUnsignedShortLE(buf.readerIndex() + 5);

    int length = headerLength + frameLength + (frameLength > 0 ? 2 : 0);

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

    return null;
}

---

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

License:Apache License

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

    buf.readerIndex(buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) 'E'));

    int endIndex = buf.indexOf(buf.readerIndex() + 1, buf.writerIndex(), (byte) 'E');
    if (endIndex > 0) {
        return buf.readRetainedSlice(endIndex - buf.readerIndex());
    } else {/*w  w w  .j  a v  a2 s .  c  om*/
        return buf.readRetainedSlice(buf.readableBytes()); // assume full frame
    }
}

---

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

License:Apache License

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

    if (buf.readableBytes() < MESSAGE_MINIMUM_LENGTH) {
        return null;
    }/*from   www .  j av a  2s.  co m*/

    int length = buf.getUnsignedShortLE(buf.readerIndex() + 1) & 0x7fff;
    if (buf.readableBytes() >= (length + MESSAGE_MINIMUM_LENGTH)) {
        return buf.readRetainedSlice(length + MESSAGE_MINIMUM_LENGTH);
    }

    return null;
}

---

From source file:org.traccar.protocol.Gl200FrameDecoder.java

License:Apache License

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

    if (buf.readableBytes() < MINIMUM_LENGTH) {
        return null;
    }//from w w w. jav  a  2s.com

    if (isBinary(buf)) {

        int length;
        switch (buf.toString(buf.readerIndex(), 4, StandardCharsets.US_ASCII)) {
        case "+ACK":
            length = buf.getUnsignedByte(buf.readerIndex() + 6);
            break;
        case "+INF":
        case "+BNF":
            length = buf.getUnsignedShort(buf.readerIndex() + 7);
            break;
        case "+HBD":
            length = buf.getUnsignedByte(buf.readerIndex() + 5);
            break;
        case "+CRD":
        case "+BRD":
            length = buf.getUnsignedShort(buf.readerIndex() + 6);
            break;
        default:
            length = buf.getUnsignedShort(buf.readerIndex() + 9);
            break;
        }

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

    } else {

        int endIndex = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) '$');
        if (endIndex < 0) {
            endIndex = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) 0);
        }
        if (endIndex > 0) {
            ByteBuf frame = buf.readRetainedSlice(endIndex - buf.readerIndex());
            buf.readByte(); // delimiter
            return frame;
        }

    }

    return null;
}

---

From source file:org.traccar.protocol.Gps056FrameDecoder.java

License:Apache License

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

    if (buf.readableBytes() >= MESSAGE_HEADER) {
        int length = Integer.parseInt(buf.toString(2, 2, StandardCharsets.US_ASCII)) + 5;
        if (buf.readableBytes() >= length) {
            ByteBuf frame = buf.readRetainedSlice(length);
            while (buf.isReadable() && buf.getUnsignedByte(buf.readerIndex()) != '$') {
                buf.readByte();/*from   w  ww .  j  av a  2  s  . c  o m*/
            }
            return frame;
        }
    }

    return null;
}

---

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

License:Apache License

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

    int indexEnd = BufferUtil.indexOf("\r\n", buf);
    if (indexEnd != -1) {
        int indexTilde = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) '~');
        if (indexTilde != -1 && indexTilde < indexEnd) {
            int length = buf.getUnsignedShortLE(indexTilde + 1);
            indexEnd = BufferUtil.indexOf("\r\n", buf, indexTilde + 2 + length, buf.writerIndex());
            if (indexEnd == -1) {
                return null;
            }//from www  . jav  a2 s .com
        }
        ByteBuf frame = buf.readRetainedSlice(indexEnd - buf.readerIndex());
        buf.skipBytes(2);
        return frame;
    }
    return null;
}

---

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