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.MeitrackFrameDecoder.java

License:Apache License

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

    if (buf.readableBytes() < 10) {
        return null;
    }/*from  w  w  w . j a  v a  2  s. com*/

    int index = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) ',');
    if (index != -1) {
        int length = index - buf.readerIndex() + Integer.parseInt(
                buf.toString(buf.readerIndex() + 3, index - buf.readerIndex() - 3, StandardCharsets.US_ASCII));
        if (buf.readableBytes() >= length) {
            return buf.readRetainedSlice(length);
        }
    }

    return null;
}

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

License:Apache License

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

    // Check minimum length
    if (buf.readableBytes() < MESSAGE_HEADER) {
        return null;
    }//from w  w w .j  a  v  a 2s .  c om

    // Check for preamble
    boolean hasPreamble = false;
    if (buf.getUnsignedIntLE(buf.readerIndex()) == PREAMBLE) {
        hasPreamble = true;
    }

    // Check length and return buffer
    int length = buf.getUnsignedShortLE(buf.readerIndex() + 6);
    if (buf.readableBytes() >= length) {
        if (hasPreamble) {
            buf.readUnsignedIntLE();
            length -= 4;
        }
        return buf.readRetainedSlice(length);
    }

    return null;
}

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

License:Apache License

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

    if (buf.getByte(buf.readerIndex()) == 0x7F) {
        return buf.readRetainedSlice(1); // keep alive
    }/*from   w ww  .j  a  v  a  2s. c  om*/

    if (ctx != null && flexDataSize == 0) {
        NavisProtocolDecoder protocolDecoder = BasePipelineFactory.getHandler(ctx.pipeline(),
                NavisProtocolDecoder.class);
        if (protocolDecoder != null) {
            flexDataSize = protocolDecoder.getFlexDataSize();
        }
    }

    if (flexDataSize > 0) {

        if (buf.readableBytes() > FLEX_HEADER_LENGTH) {
            int length = 0;
            String type = buf.toString(buf.readerIndex(), 2, StandardCharsets.US_ASCII);
            switch (type) {
            // FLEX 1.0
            case "~A":
                length = flexDataSize * buf.getByte(buf.readerIndex() + FLEX_HEADER_LENGTH) + 1 + 1;
                break;
            case "~T":
                length = flexDataSize + 4 + 1;
                break;
            case "~C":
                length = flexDataSize + 1;
                break;
            // FLEX 2.0 (Extra packages)
            case "~E":
                length++;
                for (int i = 0; i < buf.getByte(buf.readerIndex() + FLEX_HEADER_LENGTH); i++) {
                    if (buf.readableBytes() > FLEX_HEADER_LENGTH + length + 1) {
                        length += buf.getUnsignedShort(length + FLEX_HEADER_LENGTH) + 2;
                    } else {
                        return null;
                    }
                }
                length++;
                break;
            case "~X":
                length = buf.getUnsignedShortLE(buf.readerIndex() + FLEX_HEADER_LENGTH) + 4 + 1;
                break;
            default:
                return null;
            }

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

    } else {

        if (buf.readableBytes() < NTCB_HEADER_LENGTH) {
            return null;
        }

        int length = NTCB_HEADER_LENGTH + buf.getUnsignedShortLE(buf.readerIndex() + NTCB_LENGTH_OFFSET);
        if (buf.readableBytes() >= length) {
            return buf.readRetainedSlice(length);
        }

    }

    return null;
}

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

License:Apache License

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

    if (buf.readableBytes() < 4 + 2) {
        return null;
    }/*from   w ww .j  av  a2  s . c om*/

    int length;
    if (buf.getUnsignedByte(buf.readerIndex()) == 0) {
        length = 2 + buf.getUnsignedShort(buf.readerIndex());
    } else {
        length = 4 + 2 + buf.getUnsignedShort(buf.readerIndex() + 4) + 2;
    }

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

    return null;
}

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

License:Apache License

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

    int length = 6;

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

        int type = buf.getUnsignedByte(buf.readerIndex() + 2) & 0x0f;

        if (type == OrionProtocolDecoder.MSG_USERLOG && buf.readableBytes() >= length + 5) {

            int index = buf.readerIndex() + 3;
            int count = buf.getUnsignedByte(index) & 0x0f;
            index += 5;/* www  .j  a v a  2 s.  c  o m*/
            length += 5;

            for (int i = 0; i < count; i++) {
                if (buf.readableBytes() < length) {
                    return null;
                }
                int logLength = buf.getUnsignedByte(index + 1);
                index += logLength;
                length += logLength;
            }

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

        } else if (type == OrionProtocolDecoder.MSG_SYSLOG && buf.readableBytes() >= length + 12) {

            length += buf.getUnsignedShortLE(buf.readerIndex() + 8);
            if (buf.readableBytes() >= length) {
                return buf.readRetainedSlice(length);
            }

        }
    }

    return null;
}

From source file:org.traccar.protocol.Pt502FrameDecoder.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  ava2 s.com*/

    if (buf.getUnsignedByte(buf.readerIndex()) == 0xbf
            && buf.toString(buf.readerIndex() + BINARY_HEADER, 4, StandardCharsets.US_ASCII).equals("$PHD")) {

        int length = buf.getUnsignedShortLE(buf.readerIndex() + 3);
        if (buf.readableBytes() >= length) {
            buf.skipBytes(BINARY_HEADER);
            ByteBuf result = buf.readRetainedSlice(length - BINARY_HEADER - 2);
            buf.skipBytes(2); // line break
            return result;
        }

    } else {

        if (buf.getUnsignedByte(buf.readerIndex()) == 0xbf) {
            buf.skipBytes(BINARY_HEADER);
        }

        int index = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) '\r');
        if (index < 0) {
            index = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) '\n');
        }

        if (index > 0) {
            ByteBuf result = buf.readRetainedSlice(index - buf.readerIndex());
            while (buf.isReadable()
                    && (buf.getByte(buf.readerIndex()) == '\r' || buf.getByte(buf.readerIndex()) == '\n')) {
                buf.skipBytes(1);
            }
            return result;
        }

    }

    return null;
}

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

License:Apache License

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

    int length = 4 + buf.getIntLE(buf.readerIndex());
    if (buf.readableBytes() >= length) {
        return buf.readRetainedSlice(length);
    } else {//from  w w w . j  a v  a 2 s .c o  m
        return null;
    }
}

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

License:Apache License

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

    int length = messageLength(buf);

    if (buf.readableBytes() >= length) {
        return buf.readRetainedSlice(length);
    }/* ww  w. j a va 2s  .co  m*/

    return null;
}

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

License:Apache License

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

    int beginIndex = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) 0x02);
    if (beginIndex >= 0) {
        int endIndex = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) 0x03);
        if (endIndex >= 0) {
            buf.readerIndex(beginIndex + 1);
            ByteBuf frame = buf.readRetainedSlice(endIndex - beginIndex - 1);
            buf.readerIndex(endIndex + 1);
            buf.skipBytes(2); // end line
            return frame;
        }//from w  w w.  j a  v  a2  s.c  om
    }

    return null;
}

From source file:org.traccar.protocol.Stl060FrameDecoder.java

License:Apache License

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

    ByteBuf result = (ByteBuf) super.decode(ctx, buf);

    if (result != null) {

        int index = result.indexOf(result.readerIndex(), result.writerIndex(), (byte) '$');
        if (index == -1) {
            return result;
        } else {/*from   w ww .j  a  v a2  s . c  o m*/
            result.skipBytes(index);
            return result.readRetainedSlice(result.readableBytes());
        }

    }

    return null;
}