Example usage for java.nio ByteBuffer wrap

Introduction

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

Prototype

public static ByteBuffer wrap(byte[] array, int start, int len) 

Source Link

Document

Creates a new byte buffer by wrapping the given byte array.

Usage

From source file:Main.java

public static void main(String[] argv) throws Exception {

    byte[] bytes = new byte[10];
    ByteBuffer buf = ByteBuffer.wrap(bytes, 0, 4);

    System.out.println(Arrays.toString(buf.array()));
    System.out.println(buf.toString());
}

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From source file:Main.java

public static byte[] subByte(byte[] bytes, int index, int count) {
    byte[] substr = new byte[count];
    ByteBuffer.wrap(bytes, index, count).get(substr);
    return substr;
}

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From source file:Main.java

public static int toInt(byte[] bytes) {
    bb = ByteBuffer.wrap(bytes, 0, bytes.length);
    bb.order(ByteOrder.LITTLE_ENDIAN);
    return bb.getInt();
}

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From source file:Main.java

public static float toFloat(byte[] bytes) {
    bb = ByteBuffer.wrap(bytes, 0, bytes.length);
    bb.order(ByteOrder.LITTLE_ENDIAN);
    return bb.getFloat();
}

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From source file:Main.java

public static int toUnsignedShort(byte[] bytes) {
    bb = ByteBuffer.wrap(bytes, 0, bytes.length);
    bb.order(ByteOrder.LITTLE_ENDIAN);
    return bb.getShort() & 0xffff;
}

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From source file:Main.java

public static long bytearray2long(byte[] b) {
    //TODO optimize with creating a new ByteBuffer object

    ByteBuffer buf = ByteBuffer.wrap(b, 0, 8);
    return buf.getLong();
}

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From source file:Main.java

public static long Uint64FromBuffer(byte[] buffer, int offset) {
    ByteBuffer bb = ByteBuffer.wrap(buffer, offset, 8);
    bb.order(ByteOrder.BIG_ENDIAN);
    long result = bb.getLong();
    return result;
}

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From source file:Main.java

public static List<ByteBuffer> mergeAdjacentBuffers(List<ByteBuffer> paramList) {
    ArrayList localArrayList = new ArrayList(paramList.size());
    Iterator localIterator = paramList.iterator();
    while (localIterator.hasNext()) {
        ByteBuffer localByteBuffer1 = (ByteBuffer) localIterator.next();
        int i = -1 + localArrayList.size();
        if ((i >= 0) && (localByteBuffer1.hasArray()) && (((ByteBuffer) localArrayList.get(i)).hasArray())
                && (localByteBuffer1.array() == ((ByteBuffer) localArrayList.get(i)).array())
                && (((ByteBuffer) localArrayList.get(i)).arrayOffset()
                        + ((ByteBuffer) localArrayList.get(i)).limit() == localByteBuffer1.arrayOffset())) {
            ByteBuffer localByteBuffer3 = (ByteBuffer) localArrayList.remove(i);
            localArrayList.add(ByteBuffer.wrap(localByteBuffer1.array(), localByteBuffer3.arrayOffset(),
                    localByteBuffer3.limit() + localByteBuffer1.limit()).slice());
        } else if ((i >= 0) && ((localByteBuffer1 instanceof MappedByteBuffer))
                && ((localArrayList.get(i) instanceof MappedByteBuffer))
                && (((ByteBuffer) localArrayList.get(i))
                        .limit() == ((ByteBuffer) localArrayList.get(i)).capacity()
                                - localByteBuffer1.capacity())) {
            ByteBuffer localByteBuffer2 = (ByteBuffer) localArrayList.get(i);
            localByteBuffer2.limit(localByteBuffer1.limit() + localByteBuffer2.limit());
        } else {/*from w w  w  .  j  a  v  a  2  s  .  c  om*/
            localByteBuffer1.reset();
            localArrayList.add(localByteBuffer1);
        }
    }
    return localArrayList;
}

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From source file:StreamUtil.java

private static CharBuffer decodeHelper(byte[] byteArray, int numberOfBytes, java.nio.charset.Charset charset)
        throws IOException {
    CharsetDecoder decoder = charset.newDecoder();
    CharBuffer charBuffer = null;
    try {// w w  w. j  a  v  a2s  . c  o  m
        charBuffer = decoder.decode(ByteBuffer.wrap(byteArray, 0, numberOfBytes));
    } catch (MalformedInputException ex) {
        charBuffer = null;
    }
    return charBuffer;

}

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From source file:Main.java

public static List<ByteBuffer> mergeAdjacentBuffers(List<ByteBuffer> samples) {
    ArrayList<ByteBuffer> nuSamples = new ArrayList<ByteBuffer>(samples.size());
    for (ByteBuffer buffer : samples) {
        int lastIndex = nuSamples.size() - 1;
        if (lastIndex >= 0 && buffer.hasArray() && nuSamples.get(lastIndex).hasArray()
                && buffer.array() == nuSamples.get(lastIndex).array() && nuSamples.get(lastIndex).arrayOffset()
                        + nuSamples.get(lastIndex).limit() == buffer.arrayOffset()) {
            ByteBuffer oldBuffer = nuSamples.remove(lastIndex);
            ByteBuffer nu = ByteBuffer
                    .wrap(buffer.array(), oldBuffer.arrayOffset(), oldBuffer.limit() + buffer.limit()).slice();
            // We need to slice here since wrap([], offset, length) just sets position and not the arrayOffset.
            nuSamples.add(nu);//from   ww  w.java 2  s. c o  m
        } else if (lastIndex >= 0 && buffer instanceof MappedByteBuffer
                && nuSamples.get(lastIndex) instanceof MappedByteBuffer && nuSamples.get(lastIndex)
                        .limit() == nuSamples.get(lastIndex).capacity() - buffer.capacity()) {
            // This can go wrong - but will it?
            ByteBuffer oldBuffer = nuSamples.get(lastIndex);
            oldBuffer.limit(buffer.limit() + oldBuffer.limit());
        } else {
            buffer.reset();
            nuSamples.add(buffer);
        }
    }
    return nuSamples;
}

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