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:io.mycat.util.ByteBufferUtil.java

public static ByteBuffer readBytes(ByteBuffer bb, int length) {
    ByteBuffer copy = bb.duplicate();
    copy.limit(copy.position() + length);
    bb.position(bb.position() + length);
    return copy;/*w w w .  j a  v a  2 s  . c om*/
}

From source file:com.palantir.atlasdb.keyvalue.cassandra.CassandraKeyValueServices.java

public static byte[] getBytesFromByteBuffer(ByteBuffer buffer) {
    // Be careful *NOT* to perform anything that will modify the buffer's position or limit
    byte[] bytes = new byte[buffer.limit() - buffer.position()];
    if (buffer.hasArray()) {
        System.arraycopy(buffer.array(), buffer.position(), bytes, 0, bytes.length);
    } else {// w ww  .j av  a  2  s.  c  o m
        buffer.duplicate().get(bytes, buffer.position(), bytes.length);
    }
    return bytes;
}

From source file:com.glaf.core.util.BinaryUtils.java

/**
 * Returns a copy of all the bytes from the given <code>ByteBuffer</code>,
 * from the beginning to the buffer's limit; or null if the input is null.
 * <p>/*from www  .j  a v a  2s.c  om*/
 * The internal states of the given byte buffer will be restored when this
 * method completes execution.
 * <p>
 * When handling <code>ByteBuffer</code> from user's input, it's typical to
 * call the {@link #copyBytesFrom(ByteBuffer)} instead of
 * {@link #copyAllBytesFrom(ByteBuffer)} so as to account for the position
 * of the input <code>ByteBuffer</code>. The opposite is typically true,
 * however, when handling <code>ByteBuffer</code> from withint the
 * unmarshallers of the low-level clients.
 */
public static byte[] copyAllBytesFrom(ByteBuffer bb) {
    if (bb == null)
        return null;
    if (bb.hasArray())
        return Arrays.copyOf(bb.array(), bb.limit());
    bb.mark();
    // the default ByteBuffer#mark() and reset() won't work, as the
    // rewind would discard the mark position
    final int marked = bb.position();
    try {
        byte[] dst = new byte[bb.rewind().remaining()];
        bb.get(dst);
        return dst;
    } finally {
        bb.position(marked);
    }
}

From source file:com.icloud.framework.core.util.FBUtilities.java

public static ByteBuffer readByteArray(DataInput in) throws IOException {
    int length = in.readInt();
    if (length < 0) {
        throw new IOException("Corrupt (negative) value length encountered");
    }//  ww w . j  av  a 2s  . com

    ByteBuffer bb = ByteBuffer.allocate(length);
    if (length > 0) {
        in.readFully(bb.array(), bb.position(), bb.remaining());
    }
    return bb;
}

From source file:de.dfki.kiara.jsonrpc.JsonRpcMessage.java

private static JsonNode readFromBuffer(JsonRpcProtocol protocol, ByteBuffer data) throws IOException {
    byte[] array;
    int arrayOffset;
    int arrayLength;
    int oldPos = data.position();
    if (data.hasArray()) {
        array = data.array();/*  ww w. j  a  v a 2 s.  c  o  m*/
        arrayOffset = data.arrayOffset();
        arrayLength = data.remaining();
    } else {
        array = new byte[data.remaining()];
        data.get(array);
        arrayOffset = 0;
        arrayLength = array.length;
    }
    data.position(oldPos);

    JsonNode node;
    try (JsonParser parser = protocol.getObjectReader().getFactory().createParser(array, arrayOffset,
            arrayLength)) {
        node = parser.readValueAsTree();
    }
    return node;
}

From source file:com.icloud.framework.core.util.FBUtilities.java

public static void writeByteArray(ByteBuffer bytes, DataOutput out) throws IOException {
    out.writeInt(bytes.remaining());//from w  w w . j  a v a2 s .com
    out.write(bytes.array(), bytes.position() + bytes.arrayOffset(), bytes.remaining());
}

From source file:topoos.APIAccess.mime.HttpMultipart.java

/**
 * Encode.//w w w  . ja  v  a  2  s.co  m
 *
 * @param charset the charset
 * @param string the string
 * @return the byte array buffer
 */
private static ByteArrayBuffer encode(final Charset charset, final String string) {
    ByteBuffer encoded = charset.encode(CharBuffer.wrap(string));
    ByteArrayBuffer bab = new ByteArrayBuffer(encoded.remaining());
    bab.append(encoded.array(), encoded.position(), encoded.remaining());
    return bab;
}

From source file:io.mycat.util.ByteBufferUtil.java

/**
 * ByteBuffer adaptation of org.apache.commons.lang3.ArrayUtils.lastIndexOf method
 *
 * @param buffer the array to traverse for looking for the object, may be <code>null</code>
 * @param valueToFind the value to find//www.ja  v  a  2  s  .com
 * @param startIndex the start index (i.e. BB position) to travers backwards from
 * @return the last index (i.e. BB position) of the value within the array
 * [between buffer.position() and buffer.limit()]; <code>-1</code> if not found.
 */
public static int lastIndexOf(ByteBuffer buffer, byte valueToFind, int startIndex) {
    assert buffer != null;

    if (startIndex < buffer.position()) {
        return -1;
    } else if (startIndex >= buffer.limit()) {
        startIndex = buffer.limit() - 1;
    }

    for (int i = startIndex; i >= buffer.position(); i--) {
        if (valueToFind == buffer.get(i)) {
            return i;
        }
    }

    return -1;
}

From source file:com.l2jfree.security.NewCipher.java

/**
 * Calculates and embeds a packet's checksum.<BR>
 * Buffer's position will not be changed. <BR>
 * <BR>//from w  w w.ja v  a 2s. c om
 * It is assumed that the packet's body starts at current position.
 * 
 * @param buf byte buffer
 * @param size packet's body size
 */
public static void appendChecksum(ByteBuffer buf, final int size) {
    appendChecksum(buf, buf.position(), size, false);
}

From source file:com.l2jfree.security.NewCipher.java

/**
 * Verifies a packet's checksum. <BR>
 * <BR>/*from  www. ja v  a 2  s .  com*/
 * It is assumed that the packet's body starts at current position.
 * 
 * @param buf byte buffer
 * @param size packet's body size
 * @return whether packet integrity is OK or not
 */
public static boolean verifyChecksum(ByteBuffer buf, final int size) {
    return verifyChecksum(buf, buf.position(), size, false);
}