Example usage for java.nio ByteBuffer position

Introduction

In this page you can find the example usage for java.nio ByteBuffer position.

Prototype

public final int position() 

Source Link

Document

Returns the position of this buffer.

Usage

From source file:edu.umn.cs.spatialHadoop.core.ZCurvePartitioner.java

@Override
public void write(DataOutput out) throws IOException {
    mbr.write(out);//w  w w  .j a va  2  s.  com
    out.writeInt(zSplits.length);
    ByteBuffer bbuffer = ByteBuffer.allocate(zSplits.length * 8);
    for (long zSplit : zSplits)
        bbuffer.putLong(zSplit);
    if (bbuffer.hasRemaining())
        throw new RuntimeException("Did not calculate buffer size correctly");
    out.write(bbuffer.array(), bbuffer.arrayOffset(), bbuffer.position());
}

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From source file:client.MultiplexingClient.java

/**
 * Creates a new packet with a size chosen randomly between
 * MIN_SIZE and MAX_SIZE. //from  w  w w. j a  va  2s  .  com
 */
private ByteBuffer generateNextPacket() {
    // Generate a random size between 
    int size = MIN_SIZE + r.nextInt(maxPcktSize - MIN_SIZE);
    ByteBuffer buffer = ByteBuffer.allocate(size);
    buffer.put(SimpleProtocolDecoder.STX);
    for (int i = 0; i < size - 2; i++) {
        buffer.put((byte) ('0' + (i % 10)));
    }
    buffer.put(SimpleProtocolDecoder.ETX);
    buffer.limit(buffer.position());
    buffer.flip();
    return buffer;
}

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From source file:com.kylinolap.common.hll.HyperLogLogPlusCounter.java

public void readRegisters(ByteBuffer in) throws IOException {
    byte scheme = in.get();
    if ((scheme & COMPRESSION_FLAG) > 0) {
        scheme ^= COMPRESSION_FLAG;/*from   www .j a v a2 s.  c o  m*/
        int compressedLen = BytesUtil.readVInt(in);
        int end = in.position() + compressedLen;
        byte[] decompressed = DEFAULT_COMPRESSOR.decompress(in, in.position(), compressedLen);
        in.position(end);
        in = ByteBuffer.wrap(decompressed);
    }

    if (scheme == 0) { // map scheme
        clear();
        int size = BytesUtil.readVInt(in);
        if (size > m)
            throw new IllegalArgumentException(
                    "register size (" + size + ") cannot be larger than m (" + m + ")");
        int indexLen = getRegisterIndexSize();
        for (int i = 0; i < size; i++) {
            int key = BytesUtil.readUnsigned(in, indexLen);
            registers[key] = in.get();
        }
    } else { // array scheme
        for (int i = 0; i < m; i++) {
            registers[i] = in.get();
        }
    }
}

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From source file:com.l2jfree.gameserver.network.L2Client.java

@Override
public boolean decrypt(ByteBuffer buf, int size) {
    getCrypt().decrypt(buf.array(), buf.position(), size);
    return true;/*from   w ww  .  j  a  v a  2  s .  c om*/
}

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From source file:com.intel.chimera.cipher.Openssl.java

/**
 * Finishes a multiple-part operation. The data is encrypted or decrypted,
 * depending on how this cipher was initialized.
 * <p/>/*from  w w w . jav  a2 s .  com*/
 *
 * The result is stored in the output buffer. Upon return, the output buffer's
 * position will have advanced by n, where n is the value returned by this
 * method; the output buffer's limit will not have changed.
 * <p/>
 *
 * If <code>output.remaining()</code> bytes are insufficient to hold the result,
 * a <code>ShortBufferException</code> is thrown.
 * <p/>
 *
 * Upon finishing, this method resets this cipher object to the state it was
 * in when previously initialized. That is, the object is available to encrypt
 * or decrypt more data.
 * <p/>
 *
 * If any exception is thrown, this cipher object need to be reset before it
 * can be used again.
 *
 * @param output the output ByteBuffer
 * @return int number of bytes stored in <code>output</code>
 * @throws ShortBufferException
 * @throws IllegalBlockSizeException
 * @throws BadPaddingException
 */
public int doFinal(ByteBuffer output)
        throws ShortBufferException, IllegalBlockSizeException, BadPaddingException {
    checkState();
    Utils.checkArgument(output.isDirect(), "Direct buffer is required.");
    int len = OpensslNative.doFinal(context, output, output.position(), output.remaining());
    output.position(output.position() + len);
    return len;
}

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From source file:com.l2jfree.gameserver.network.L2Client.java

@Override
public boolean encrypt(final ByteBuffer buf, final int size) {
    getCrypt().encrypt(buf.array(), buf.position(), size);
    buf.position(buf.position() + size);
    return true;// www  .  j  a  va2 s.c  om
}

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From source file:org.wso2.carbon.inbound.endpoint.protocol.http2.http2Encoder.java

@Override
public int write(ByteBuffer src) throws IOException {
    while (src.hasRemaining()) {
        byte[] b;
        b = new byte[src.remaining()];
        src.get(b);//from   ww w.  j a  v a  2 s  .c  o  m

        if (src.hasRemaining())
            encoder.writeData(chContext, streamId, Unpooled.wrappedBuffer(b), 0, false, promise);
        else {
            encoder.writeData(chContext, streamId, Unpooled.wrappedBuffer(b), 0, true, promise);
            isComplete = true;
        }

    }

    return src.position();
}

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From source file:org.red5.stream.http.servlet.TransportSegmentFeeder.java

/**
 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
 *      response)//from  w  w w  .  j av  a 2  s . c  o m
 */
protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    log.debug("Segment feed requested");
    // get red5 context and segmenter
    if (service == null) {
        ApplicationContext appCtx = (ApplicationContext) getServletContext()
                .getAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE);
        service = (SegmenterService) appCtx.getBean("segmenter.service");
    }
    // get the requested stream / segment
    String servletPath = request.getServletPath();
    String streamName = servletPath.split("\\.")[0];
    log.debug("Stream name: {}", streamName);
    if (service.isAvailable(streamName)) {
        response.setContentType("video/MP2T");
        // data segment
        Segment segment = null;
        // setup buffers and output stream
        byte[] buf = new byte[188];
        ByteBuffer buffer = ByteBuffer.allocate(188);
        ServletOutputStream sos = response.getOutputStream();
        // loop segments
        while ((segment = service.getSegment(streamName)) != null) {
            do {
                buffer = segment.read(buffer);
                // log.trace("Limit - position: {}", (buffer.limit() - buffer.position()));
                if ((buffer.limit() - buffer.position()) == 188) {
                    buffer.get(buf);
                    // write down the output stream
                    sos.write(buf);
                } else {
                    log.info("Segment result has indicated a problem");
                    // verifies the currently requested stream segment
                    // number against the currently active segment
                    if (service.getSegment(streamName) == null) {
                        log.debug("Requested segment is no longer available");
                        break;
                    }
                }
                buffer.clear();
            } while (segment.hasMoreData());
            log.trace("Segment {} had no more data", segment.getIndex());
            // flush
            sos.flush();
            // segment had no more data
            segment.cleanupThreadLocal();
        }
        buffer.clear();
        buffer = null;
    } else {
        // let requester know that stream segment is not available
        response.sendError(404, "Requested segmented stream not found");
    }
}

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From source file:com.buaa.cfs.nfs3.WriteCtx.java

public void writeData(DataOutputStream fos) throws IOException {
    Preconditions.checkState(fos != null);

    ByteBuffer dataBuffer;
    try {/* w w  w .  j av  a  2s .  c o  m*/
        dataBuffer = getData();
    } catch (Exception e1) {
        LOG.error("Failed to get request data offset:" + offset + " count:" + count + " error:" + e1);
        throw new IOException("Can't get WriteCtx.data");
    }

    byte[] data = dataBuffer.array();
    int position = dataBuffer.position();
    int limit = dataBuffer.limit();
    Preconditions.checkState(limit - position == count);
    // Modified write has a valid original count
    if (position != 0) {
        if (limit != getOriginalCount()) {
            throw new IOException("Modified write has differnt original size." + "buff position:" + position
                    + " buff limit:" + limit + ". " + toString());
        }
    }

    // Now write data
    //        fos.write(data, position, count);
}

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From source file:net.kungfoo.grizzly.proxy.impl.ConnectingHandler.java

public void outputReady(final NHttpClientConnection conn, final ContentEncoder encoder) {
    System.out.println(conn + " [proxy->origin] output ready");

    HttpContext context = conn.getContext();
    ProxyProcessingInfo proxyTask = (ProxyProcessingInfo) context.getAttribute(ProxyProcessingInfo.ATTRIB);

    synchronized (proxyTask) {
        ConnState connState = proxyTask.getOriginState();
        if (connState != ConnState.REQUEST_SENT && connState != ConnState.REQUEST_BODY_STREAM) {
            throw new IllegalStateException("Illegal target connection state: " + connState);
        }/*from  w  w  w .j  av a 2s . co  m*/

        try {

            // TODO: propper handling of POST
            ByteBuffer src = proxyTask.getInBuffer();
            final int srcSize = src.limit();
            if (src.position() != 0) {
                System.out.println(conn + " [proxy->origin] buff not consumed yet");
                return;
            }
            ByteChunk chunk = new ByteChunk(srcSize);
            Request originalRequest = proxyTask.getOriginalRequest();
            int read;
            int encRead = 0;
            long bytesWritten = 0;
            while ((read = originalRequest.doRead(chunk)) != -1) {
                System.out.println(conn + " [proxy->origin] " + read + " bytes read");
                if (read > srcSize) {
                    src = ByteBuffer.wrap(chunk.getBytes(), chunk.getOffset(), read);
                } else {
                    src.put(chunk.getBytes(), chunk.getOffset(), read);
                }
                src.flip();
                encRead = encoder.write(src);
                bytesWritten += encRead;
                src.compact();
                chunk.reset();
                if (encRead == 0) {
                    System.out.println(conn + " [proxy->origin] encoder refused to consume more");
                    break;
                } else {
                    System.out.println(conn + " [proxy->origin] " + encRead + " consumed by encoder");
                }
            }
            System.out.println(conn + " [proxy->origin] " + bytesWritten + " bytes written");
            System.out.println(conn + " [proxy->origin] " + encoder);
            src.compact();

            if (src.position() == 0 && encRead != 0) {
                encoder.complete();
            }
            // Update connection state
            if (encoder.isCompleted()) {
                System.out.println(conn + " [proxy->origin] request body sent");
                proxyTask.setOriginState(ConnState.REQUEST_BODY_DONE);
            } else {
                proxyTask.setOriginState(ConnState.REQUEST_BODY_STREAM);
            }

        } catch (IOException ex) {
            shutdownConnection(conn);
        }
    }
}

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