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:android.framework.util.jar.Manifest.java

private static void writeEntry(OutputStream os, Attributes.Name name, String value, CharsetEncoder encoder,
        ByteBuffer bBuf) throws IOException {
    String nameString = name.getName();
    os.write(nameString.getBytes(Charsets.US_ASCII));
    os.write(VALUE_SEPARATOR);/* ww w .  j  ava2  s . co  m*/

    encoder.reset();
    bBuf.clear().limit(LINE_LENGTH_LIMIT - nameString.length() - 2);

    CharBuffer cBuf = CharBuffer.wrap(value);

    while (true) {
        CoderResult r = encoder.encode(cBuf, bBuf, true);
        if (CoderResult.UNDERFLOW == r) {
            r = encoder.flush(bBuf);
        }
        os.write(bBuf.array(), bBuf.arrayOffset(), bBuf.position());
        os.write(LINE_SEPARATOR);
        if (CoderResult.UNDERFLOW == r) {
            break;
        }
        os.write(' ');
        bBuf.clear().limit(LINE_LENGTH_LIMIT - 1);
    }
}

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From source file:de.csdev.ebus.command.EBusCommandUtils.java

/**
 * Build an escaped telegram part for a slave answer
 *
 * @param slaveData/*from   w w w. j a  va  2 s  .  c  o  m*/
 * @return
 * @throws EBusTypeException
 */
public static ByteBuffer buildPartSlave(byte[] slaveData) throws EBusTypeException {

    ByteBuffer buf = ByteBuffer.allocate(50);

    buf.put(EBusConsts.ACK_OK); // ACK

    // if payload available
    if (slaveData != null && slaveData.length > 0) {
        buf.put((byte) slaveData.length); // NN - Length

        // add the escaped bytes
        for (byte b : slaveData) {
            buf.put(escapeSymbol(b));
        }

        // calculate crc
        byte crc8 = EBusUtils.crc8(buf.array(), buf.position());

        // add the crc, maybe escaped
        buf.put(escapeSymbol(crc8));
    } else {
        // only set len = 0
        buf.put((byte) 0x00); // NN - Length
    }

    // set limit and reset position
    buf.limit(buf.position());
    buf.position(0);

    return buf;
}

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From source file:com.fujitsu.dc.test.jersey.bar.BarInstallTestUtils.java

/**
 * bar?.//from w w  w  .j a  v  a 2  s. co  m
 * @param barFile bar?
 * @return ??bar
 */
public static byte[] readBarFile(File barFile) {
    InputStream is = ClassLoader.getSystemResourceAsStream(barFile.getPath());
    ByteBuffer buff = ByteBuffer.allocate(READ_BUFFER_SIZE);
    log.debug(String.valueOf(buff.capacity()));
    try {
        byte[] bbuf = new byte[SIZE_KB];
        int size;
        while ((size = is.read(bbuf)) != -1) {
            buff.put(bbuf, 0, size);
        }
    } catch (IOException e) {
        throw new RuntimeException("failed to load bar file:" + barFile.getPath(), e);
    } finally {
        try {
            is.close();
        } catch (IOException e) {
            throw new RuntimeException("failed to close bar file:" + barFile.getPath(), e);
        }
    }
    int size = buff.position();
    buff.flip();
    byte[] retv = new byte[size];
    buff.get(retv, 0, size);
    return retv;
}

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From source file:com.linkedin.databus.core.DbusEventV2.java

public static int serializeEvent(DbusEventKey key, ByteBuffer buf, DbusEventInfo dbusEventInfo) {
    // Serialize a DbusEventV2 that has exact same contents as a DbusEventV1.
    final int start = buf.position();
    buf.put(DbusEventFactory.DBUS_EVENT_V2);
    buf.putInt(MAGIC);//  ww  w . j a v  a 2 s .co  m
    buf.putInt(0); // Header len placeholder
    buf.putInt(0); // Header crc placeholder
    buf.putInt(0); // Body CRC placeholder
    buf.putInt(0); // total length placeholder

    short attributes = 0;
    attributes = setOpCode(dbusEventInfo.getOpCode(), attributes, dbusEventInfo.getSrcId());
    attributes = setKeyType(key, attributes);
    if (dbusEventInfo.isEnableTracing()) {
        attributes |= FLAG_TRACE_ON;
    }

    if (dbusEventInfo.isReplicated()) {
        attributes |= FLAG_IS_REPLICATED;
    }

    DbusEventPart metadata = dbusEventInfo.getMetadata();
    if (shouldEncodePayloadPart(dbusEventInfo)) {
        attributes |= FLAG_HAS_PAYLOAD_PART;
    }
    if (metadata != null) {
        attributes |= FLAG_HAS_PAYLOAD_METADATA_PART;
    }
    buf.putShort(attributes);
    buf.putLong(dbusEventInfo.getTimeStampInNanos());
    buf.putInt(dbusEventInfo.getSrcId());
    buf.putShort(dbusEventInfo.getpPartitionId());
    buf.putLong(dbusEventInfo.getSequenceId());

    // Fixed part of header is done. Now for the variable header part
    setKey(buf, key);
    final int hdrEndPos = buf.position();

    if (metadata != null) {
        metadata.encode(buf);
    }

    if ((attributes & FLAG_HAS_PAYLOAD_PART) != 0) {
        ByteBuffer bb = dbusEventInfo.getValueByteBuffer();
        if (bb == null) {
            // Special case to encode when there is no data.
            bb = ByteBuffer.allocate(1).order(buf.order());
            bb.limit(0);
        }
        DbusEventPart valuePart = new DbusEventPart(SchemaDigestType.MD5, dbusEventInfo.getSchemaId(),
                dbusEventInfo.getPayloadSchemaVersion(), bb);
        valuePart.encode(buf);
    }
    final int end = buf.position();
    buf.putInt(start + HeaderLenOffset, hdrEndPos - start);
    buf.putInt(start + TotalLenOffset, end - start);

    long bodyCrc = ByteBufferCRC32.getChecksum(buf, hdrEndPos, end - hdrEndPos);
    Utils.putUnsignedInt(buf, start + BodyCrcOffset, bodyCrc);
    // Header CRC
    if (dbusEventInfo.isAutocommit()) {
        // Do the body CRC first, since that is included in the header CRC
        long hdrCrc = ByteBufferCRC32.getChecksum(buf, start + BodyCrcOffset,
                hdrEndPos - start - BodyCrcOffset);
        Utils.putUnsignedInt(buf, start + HeaderCrcOffset, hdrCrc);
    }
    return buf.position() - start;
}

---

From source file:com.healthmarketscience.jackcess.impl.OleUtil.java

private static byte[] writePackageHeader(OleBlob.Builder oleBuilder, long contentLen) {

    byte[] prettyNameBytes = getZeroTermStrBytes(oleBuilder.getPrettyName());
    String className = oleBuilder.getClassName();
    String typeName = oleBuilder.getTypeName();
    if (className == null) {
        className = typeName;//from  w  w  w.  j a v  a  2  s  . co m
    } else if (typeName == null) {
        typeName = className;
    }
    byte[] classNameBytes = getZeroTermStrBytes(className);
    byte[] typeNameBytes = getZeroTermStrBytes(typeName);

    int packageHeaderLen = 20 + prettyNameBytes.length + classNameBytes.length;

    int oleHeaderLen = 24 + typeNameBytes.length;

    byte[] headerBytes = new byte[packageHeaderLen + oleHeaderLen];

    ByteBuffer bb = PageChannel.wrap(headerBytes);

    // write outer package header
    bb.putShort((short) PACKAGE_SIGNATURE);
    bb.putShort((short) packageHeaderLen);
    bb.putInt(PACKAGE_OBJECT_TYPE);
    bb.putShort((short) prettyNameBytes.length);
    bb.putShort((short) classNameBytes.length);
    int prettyNameOff = bb.position() + 8;
    bb.putShort((short) prettyNameOff);
    bb.putShort((short) (prettyNameOff + prettyNameBytes.length));
    bb.putInt(-1);
    bb.put(prettyNameBytes);
    bb.put(classNameBytes);

    // put ole header
    bb.putInt(OLE_VERSION);
    bb.putInt(OLE_FORMAT);
    bb.putInt(typeNameBytes.length);
    bb.put(typeNameBytes);
    bb.putLong(0L);
    bb.putInt((int) contentLen);

    return headerBytes;
}

---

From source file:de.csdev.ebus.command.EBusCommandUtils.java

/**
 * Build a complete telegram for master/slave, master/master and broadcasts
 *
 * @param source//  ww w .j a  va2 s  . c  o  m
 * @param target
 * @param command
 * @param masterData
 * @param slaveData
 * @return
 * @throws EBusTypeException
 */
public static ByteBuffer buildCompleteTelegram(byte source, byte target, byte[] command, byte[] masterData,
        byte[] slaveData) throws EBusTypeException {

    boolean isMastereMaster = EBusUtils.isMasterAddress(target);
    boolean isBroadcast = target == EBusConsts.BROADCAST_ADDRESS;
    boolean isMasterSlave = !isMastereMaster && !isBroadcast;

    ByteBuffer buf = ByteBuffer.allocate(50);
    buf.put(buildPartMasterTelegram(source, target, command, masterData));

    // if used compute a complete telegram
    if (isMasterSlave && slaveData != null) {
        ByteBuffer slaveTelegramPart = buildPartSlave(slaveData);
        buf.put(slaveTelegramPart);

        buf.put(EBusConsts.ACK_OK);
        buf.put(EBusConsts.SYN);
    }

    if (isMastereMaster) {
        buf.put(EBusConsts.ACK_OK);
        buf.put(EBusConsts.SYN);
    }

    if (isBroadcast) {
        buf.put(EBusConsts.SYN);
    }

    // set limit and reset position
    buf.limit(buf.position());
    buf.position(0);

    return buf;
}

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From source file:net.phoenix.thrift.hello.SpringHelloService.java

@Override
public ByteBuffer testBinary(ByteBuffer name) throws TException {
    try {//from  w  ww  .j a  v a 2  s.co  m

        String result = new String(name.array(), name.position(), name.limit() - name.position(), "UTF-8");
        result = "Hello " + result;
        return ByteBuffer.wrap(result.getBytes("UTF-8"));
    } catch (UnsupportedEncodingException e) {
        throw new TException(e);
    }
}

---

From source file:com.openteach.diamond.network.waverider.network.Packet.java

/**
 * ??Packet, ??//from   w  w  w  . ja v  a  2s  .c o m
 * @param inputBuffer
 * @return
 * @throws IOException, InterruptedException
 */
public static Packet parse(BlockingQueue<ByteBuffer> inputBuffer, NetWorkEndPoint endPoint,
        SocketChannel channel) throws IOException, InterruptedException {
    // Buffer for packet header
    byte[] tmpBuf = new byte[NetWorkConstants.DEFAULT_NETWORK_BUFFER_SIZE];
    ByteBuffer header = ByteBuffer.allocate(Packet.getHeaderSize());
    ByteBuffer currentBuffer = null;
    int rest = 0;
    boolean isRemove = false;

    // ?
    while (true) {
        while ((currentBuffer = inputBuffer.peek()) == null) {
            if (!endPoint.notifyRead(channel)) {
                throw new IOException("Socket closed by other thread");
            }
            // ?
            //endPoint.waitMoreData(5);
            // FIXME 2ms
            //Thread.sleep(1);
            Thread.yield();
        }
        isRemove = false;
        rest = header.capacity() - header.position();
        if (currentBuffer.remaining() >= rest) {
            if (currentBuffer.remaining() == rest) {
                isRemove = true;
            }
            currentBuffer.get(tmpBuf, 0, rest);
            header.put(tmpBuf, 0, rest);
            if (isRemove) {
                inputBuffer.remove();
            }
            break;
        } else {
            header.put(currentBuffer);
            inputBuffer.remove();
        }
    }

    header.flip();

    // , ???

    // ?
    Integer size = header.getInt(Packet.getLengthPosition());
    // For test
    /*if(size < 0 || size > 100000) {
       logger.info("Error");
    }*/
    //logger.debug(new StringBuilder("Try to allocate ").append(size).append(" bytes memory"));
    ByteBuffer buffer = ByteBuffer.allocate(size);
    buffer.put(header);
    header.clear();

    // ?
    while (true) {
        while ((currentBuffer = inputBuffer.peek()) == null) {
            endPoint.notifyRead(channel);
            Thread.sleep(1000);
        }
        isRemove = false;
        rest = buffer.capacity() - buffer.position();
        if (currentBuffer.remaining() >= rest) {
            if (currentBuffer.remaining() == rest) {
                isRemove = true;
            }
            currentBuffer.get(tmpBuf, 0, rest);
            buffer.put(tmpBuf, 0, rest);
            if (isRemove) {
                inputBuffer.remove();
            }
            break;
        } else {
            buffer.put(currentBuffer);
            inputBuffer.remove();
        }
    }
    //buffer.position(0);
    buffer.flip();
    Packet packet = Packet.unmarshall(buffer);
    //logger.info("Parse one packet from network");
    //packet.dump();
    return packet;
}

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From source file:com.bennavetta.appsite.file.ResourceService.java

private void copy(ReadableByteChannel src, WritableByteChannel dest) throws IOException {
    ByteBuffer buffer = ByteBuffer.allocateDirect(bufferSize.get());
    while (src.read(buffer) != -1 || buffer.position() != 0) {
        buffer.flip();//from   w w w  .j  av a2 s  . c  o m
        dest.write(buffer);
        buffer.compact();
    }
}

---

From source file:com.github.neoio.net.message.staging.memory.MemoryMessageStaging.java

@Override
public void writePrimaryStaging(ByteBuffer buffer, int length) throws NetIOException {
    primaryStage.write(buffer.array(), buffer.position(), length);
    buffer.position(buffer.limit());/*from   w ww.j av a  2 s . co m*/
}

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