Example usage for io.netty.buffer ByteBuf readBytes

Introduction

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

Prototype

public abstract ByteBuf readBytes(ByteBuffer dst);

Source Link

Document

Transfers this buffer's data to the specified destination starting at the current readerIndex until the destination's position reaches its limit, and increases the readerIndex by the number of the transferred bytes.

Usage

From source file:com.fjn.helper.frameworkex.netty.v4.echotest.EchoClientHandler.java

License:Apache License

@Override
protected void channelRead0(ChannelHandlerContext ctx, ByteBuf msg) throws Exception {
    System.out.println("Client received : " + ByteBufUtil.hexDump(msg.readBytes(msg.readableBytes())));
    msg.release();/*from   w ww  . j  av  a  2  s . c o m*/
}

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From source file:com.flowpowered.engine.network.codec.ChunkDataCodec.java

License:MIT License

@Override
public ChunkDataMessage decode(ByteBuf buffer) throws IOException {
    final byte info = buffer.readByte();
    final boolean unload = (info & ISUNLOAD) == ISUNLOAD;
    final int x = buffer.readInt();
    final int y = buffer.readInt();
    final int z = buffer.readInt();
    if (unload) {
        return new ChunkDataMessage(x, y, z);
    } else {/*w  w  w.  j av a2 s  .  co m*/
        int uncompressedSize = INTIAL_DATA_SIZE;
        final byte[] uncompressedData = new byte[uncompressedSize];
        final byte[] compressedData = new byte[buffer.readInt()];
        buffer.readBytes(compressedData);
        Inflater inflater = new Inflater();
        inflater.setInput(compressedData);
        try {
            inflater.inflate(uncompressedData);
        } catch (DataFormatException e) {
            throw new IOException("Error while reading chunk (" + x + "," + y + "," + z + ")!", e);
        }
        inflater.end();

        final int[] blocks = new int[Chunk.BLOCKS.VOLUME];

        int index = 0;
        for (int i = 0; i < blocks.length; ++i) {
            blocks[i] = uncompressedData[index++] | (uncompressedData[index++] << 8)
                    | (uncompressedData[index++] << 16) | (uncompressedData[index++] << 24);
        }

        if (index != uncompressedData.length) {
            throw new IllegalStateException(
                    "Incorrect parse size - actual:" + index + " expected: " + uncompressedData.length);
        }

        return new ChunkDataMessage(x, y, z, blocks);
    }
}

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From source file:com.flowpowered.network.pipeline.MessageDecoder.java

License:MIT License

@Override
protected void decode(ChannelHandlerContext ctx, ByteBuf buf, List<Object> out) throws Exception {
    Protocol protocol = messageHandler.getSession().getProtocol();
    Codec<?> codec;/*from  ww  w  . j  a  v  a  2s  . co  m*/
    try {
        codec = protocol.readHeader(buf);
    } catch (UnknownPacketException e) {
        // We want to catch this and read the length if possible
        int length = e.getLength();
        if (length != -1 && length != 0) {
            buf.readBytes(length);
        }
        throw e;
    }

    if (codec == null) {
        throw new UnsupportedOperationException("Protocol#readHeader cannot return null!");
    }
    Message decoded = codec.decode(buf);
    out.add(decoded);
}

---

From source file:com.flowpowered.network.pipeline.MessageProcessorDecoder.java

License:MIT License

@Override
protected void decode(ChannelHandlerContext ctx, ByteBuf buf, List<Object> frames) throws Exception {
    MessageProcessor processor = getProcessor();
    if (processor == null) {
        frames.add(buf.readBytes(buf.readableBytes()));
        return;//w w w.  j  a  va  2s  .  c  om
    }
    // Eventually, we will run out of bytes and a ReplayableError will be called
    ByteBuf liveBuffer = ctx.alloc().buffer();
    liveBuffer = processor.processInbound(ctx, buf, liveBuffer);
    frames.add(liveBuffer);
}

---

From source file:com.flowpowered.network.pipeline.MessageProcessorDecoderTest.java

License:MIT License

@Test
public void test() throws Exception {
    // Preprocessor basically is split into two parts
    // Part 1 is just a direct copy
    // Part 2 negates all bytes before copying
    final AtomicReference<MessageProcessor> processor = new AtomicReference<>();
    MessageProcessorDecoder processorDecoder = new MessageProcessorDecoder(null) {
        @Override/* w w w  . j  a  v a  2  s.  c  o  m*/
        protected MessageProcessor getProcessor() {
            return processor.get();
        }
    };

    // Set up a fake ChannelHandlerContext
    FakeChannelHandlerContext fake = ChannelHandlerContextFaker.setup();
    AtomicReference<ByteBuf> ref = new AtomicReference<>();
    fake.setReference(ref);
    LinkedList<byte[]> outputList = new LinkedList<>();

    Random r = new Random();

    // Get some random bytes for data
    byte[] input = new byte[LENGTH];
    r.nextBytes(input);

    boolean breakOccured = false;
    int position = 0;

    for (int i = 0; i < input.length;) {
        // Simulate real data read
        int burstSize = r.nextInt(512);
        // With a 1/10 chance of having an extra-large burst
        if (r.nextInt(10) == 0) {
            burstSize *= 10;
        }

        // Final burst needs to be clamped
        if (i + burstSize > input.length) {
            burstSize = input.length - i;
        }

        // And we can't negate in the middle of a burst
        if (i + burstSize > BREAK && !breakOccured) {
            burstSize = BREAK - i;
        }

        // Write info to a new ByteBuf
        final ByteBuf buf = Unpooled.buffer(burstSize);
        buf.writeBytes(input, i, burstSize);
        i += burstSize;

        // Fake a read
        processorDecoder.channelRead(fake, buf);

        final ByteBuf returned = ref.get();

        while (returned != null) {
            int packetSize = r.nextInt(128) + 1;
            if (r.nextInt(10) == 0) {
                packetSize *= 20;
            }

            if (packetSize > returned.readableBytes()) {
                packetSize = returned.readableBytes();
            }
            if (position + packetSize > BREAK && !breakOccured) {
                packetSize = BREAK - position;
            }
            if (position + packetSize > LENGTH) {
                packetSize = LENGTH - position;
            }

            if (packetSize == 0) {
                break;
            }

            byte[] array = new byte[packetSize];

            returned.readBytes(array);
            position += packetSize;

            if (position == BREAK) {
                processor.set(new NegatingProcessor(512));
                breakOccured = true;
            }
            outputList.add(array);
        }
    }

    // Get the output data and combine into one array
    byte[] output = new byte[LENGTH];
    int i = 0;
    for (byte[] array : outputList) {
        for (int j = 0; j < array.length; j++) {
            output[i++] = array[j];
        }
    }

    for (i = 0; i < input.length; i++) {
        byte expected = i < BREAK ? input[i] : (byte) ~input[i];
        if (output[i] != expected) {
            for (int j = Math.max(0, i - 10); j <= i + 10; j++) {
                System.out.println(j + ") " + Integer.toBinaryString(j < BREAK ? input[j] : (byte) ~input[j])
                        + " " + Integer.toBinaryString(output[j]));
            }
        }

        if (i < BREAK) {
            assertTrue("Input/Output mismatch at position " + i + ". Expected " + input[i] + " but got "
                    + output[i] + ". Break is: " + BREAK, output[i] == input[i]);
        } else {
            assertTrue(
                    "Input/Output mismatch at position " + i + ", after the processor change. Expected "
                            + (byte) ~input[i] + " but got " + output[i] + ". Break is: " + BREAK,
                    output[i] == (byte) ~input[i]);
        }
    }
}

---

From source file:com.flowpowered.network.pipeline.MessageProcessorEncoder.java

License:MIT License

@Override
protected void encode(ChannelHandlerContext ctx, final ByteBuf buf, List<Object> out) throws Exception {
    final MessageProcessor processor = getProcessor();
    if (processor == null) {
        out.add(buf.readBytes(buf.readableBytes()));
        return;// w  ww.jav  a 2  s . c om
    }
    ByteBuf toAdd = ctx.alloc().buffer();
    toAdd = processor.processOutbound(ctx, buf, toAdd);
    out.add(toAdd);
}

---

From source file:com.flowpowered.network.util.ByteBufUtils.java

License:MIT License

/**
 * Reads an UTF8 string from a byte buffer.
 *
 * @param buf The byte buffer to read from
 * @return The read string//from w  w w  .jav a2  s  . co m
 * @throws java.io.IOException If the reading fails
 */
public static String readUTF8(ByteBuf buf) throws IOException {
    // Read the string's length
    final int len = readVarInt(buf);
    final byte[] bytes = new byte[len];
    buf.readBytes(bytes);
    return new String(bytes, StandardCharsets.UTF_8);
}

---

From source file:com.flowpowered.networking.pipeline.MessageDecoder.java

License:MIT License

@Override
protected void decode(ChannelHandlerContext ctx, ByteBuf buf, List<Object> out) throws Exception {
    Protocol protocol = messageHandler.getSession().getProtocol();
    Codec<?> codec = null;/*from  www  .j  a  va2 s  .  c  om*/
    try {
        codec = protocol.readHeader(buf);
    } catch (UnknownPacketException e) {
        // We want to catch this and read the length if possible
        int length = e.getLength();
        if (length != -1 && length != 0) {
            buf.readBytes(length);
        }
        throw e;
    }

    if (codec == null) {
        throw new UnsupportedOperationException("Protocol#readHeader cannot return null!");
    }
    Message decoded = codec.decode(buf);
    ctx.fireChannelRead(decoded);
}

---

From source file:com.flowpowered.networking.pipeline.MessageProcessorDecoderTest.java

License:MIT License

@Test
public void test() throws Exception {
    // Preprocessor basically is split into two parts
    // Part 1 is just a direct copy
    // Part 2 negates all bytes before copying
    final AtomicReference<MessageProcessor> processor = new AtomicReference<>();
    MessageProcessorDecoder processorDecoder = new MessageProcessorDecoder(null) {
        @Override//from  ww w  . java 2 s .  c om
        protected MessageProcessor getProcessor() {
            return processor.get();
        }
    };

    // Set up a fake ChannelHandlerContext
    FakeChannelHandlerContext fake = ChannelHandlerContextFaker.setup();
    AtomicReference<ByteBuf> ref = new AtomicReference<>();
    fake.setReference(ref);
    LinkedList<byte[]> outputList = new LinkedList<byte[]>();

    Random r = new Random();

    // Get some random bytes for data
    byte[] input = new byte[LENGTH];
    r.nextBytes(input);

    boolean breakOccured = false;
    int position = 0;

    for (int i = 0; i < input.length;) {
        // Simulate real data read
        int burstSize = r.nextInt(512);
        // With a 1/10 chance of having an extra-large burst
        if (r.nextInt(10) == 0) {
            burstSize *= 10;
        }

        // Final burst needs to be clamped
        if (i + burstSize > input.length) {
            burstSize = input.length - i;
        }

        // And we can't negate in the middle of a burst
        if (i + burstSize > BREAK && !breakOccured) {
            burstSize = BREAK - i;
        }

        // Write info to a new ByteBuf
        final ByteBuf buf = Unpooled.buffer(burstSize);
        buf.retain();
        buf.writeBytes(input, i, burstSize);
        i += burstSize;

        // Fake a read
        processorDecoder.channelRead(fake, buf);

        final ByteBuf returned = ref.get();

        while (returned != null && true) {
            int packetSize = r.nextInt(128) + 1;
            if (r.nextInt(10) == 0) {
                packetSize *= 20;
            }

            if (packetSize > returned.readableBytes()) {
                packetSize = returned.readableBytes();
            }
            if (position + packetSize > BREAK && !breakOccured) {
                packetSize = BREAK - position;
            }
            if (position + packetSize > LENGTH) {
                packetSize = LENGTH - position;
            }

            if (packetSize == 0) {
                break;
            }

            byte[] array = new byte[packetSize];

            returned.readBytes(array);
            position += packetSize;

            if (position == BREAK) {
                processor.set(new NegatingProcessor(512));
                breakOccured = true;
            }
            outputList.add(array);
        }
    }

    // Get the output data and combine into one array
    byte[] output = new byte[LENGTH];
    int i = 0;
    for (byte[] array : outputList) {
        for (int j = 0; j < array.length; j++) {
            output[i++] = array[j];
        }
    }

    for (i = 0; i < input.length; i++) {
        byte expected = i < BREAK ? input[i] : (byte) ~input[i];
        if (output[i] != expected) {
            for (int j = Math.max(0, i - 10); j <= i + 10; j++) {
                System.out.println(j + ") " + Integer.toBinaryString(j < BREAK ? input[j] : (byte) ~input[j])
                        + " " + Integer.toBinaryString(output[j]));
            }
        }

        if (i < BREAK) {
            assertTrue("Input/Output mismatch at position " + i + ". Expected " + input[i] + " but got "
                    + output[i] + ". Break is: " + BREAK, output[i] == input[i]);
        } else {
            assertTrue(
                    "Input/Output mismatch at position " + i + ", after the processor change. Expected "
                            + (byte) ~input[i] + " but got " + output[i] + ". Break is: " + BREAK,
                    output[i] == (byte) ~input[i]);
        }
    }
}

---

From source file:com.foilen.smalltools.net.commander.channel.CommanderDecoder.java

License:Open Source License

@Override
protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {

    logger.debug("Trying to decode a message. Readable bytes {}", in.readableBytes());

    // classNameSize:int
    int len = in.readInt();

    // className:String
    String className = in.readBytes(len).toString(CharsetTools.UTF_8);

    // jsonContentSize:int
    len = in.readInt();/*from w  w w  .  ja  v  a2 s  .  co  m*/

    // jsonContent:String
    String jsonContent = in.readBytes(len).toString(CharsetTools.UTF_8);

    // Add the JSON runnable to the list
    logger.debug("Decoding class {} with json {}", className, jsonContent);

    out.add(JsonTools.readFromString(jsonContent, Class.forName(className)));
    logger.debug("Completely got a {}", className);
}

---

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