Example usage for java.nio ByteBuffer allocateDirect

Introduction

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

Prototype

public static ByteBuffer allocateDirect(int capacity)

Source Link

Document

Creates a direct byte buffer based on a newly allocated memory block.

Usage

From source file:Main.java

public static ByteBuffer fromStream(InputStream stream) throws IOException {
    ByteArrayOutputStream outStream = new ByteArrayOutputStream(BUFFER_SIZE);

    byte[] buffer = BUFFER_REF.getAndSet(null);
    if (buffer == null) {
        buffer = new byte[BUFFER_SIZE];
    }// w w w.j av a 2 s .  c  o m

    int n = -1;
    while ((n = stream.read(buffer)) >= 0) {
        outStream.write(buffer, 0, n);
    }

    BUFFER_REF.set(buffer);

    byte[] bytes = outStream.toByteArray();

    // Some resource decoders require a direct byte buffer. Prefer allocateDirect() over wrap()
    return (ByteBuffer) ByteBuffer.allocateDirect(bytes.length).put(bytes).position(0);
}

From source file:Main.java

public static ByteBuffer createByteBuffer(final int size) {
    final ByteBuffer buf = ByteBuffer.allocateDirect(size).order(ByteOrder.nativeOrder());
    buf.clear();/*w w w  .  j a v a 2  s  . c  o  m*/
    return buf;
}

From source file:Main.java

/**
 * Allocates a direct float buffer, and populates it with the float array data.
 */// w  w  w .j av  a2  s  . c  om
public static FloatBuffer createFloatBuffer(float[] coords) {
    // Allocate a direct ByteBuffer, using 4 bytes per float, and copy coords into it.
    ByteBuffer bb = ByteBuffer.allocateDirect(coords.length * SIZEOF_FLOAT);
    bb.order(ByteOrder.nativeOrder());
    FloatBuffer fb = bb.asFloatBuffer();
    fb.put(coords);
    fb.position(0);
    return fb;
}

From source file:Main.java

public static ByteBuffer newByteBuffer(int numElements) {
    ByteBuffer bb = ByteBuffer.allocateDirect(numElements);
    bb.order(ByteOrder.nativeOrder());
    return bb;/*w  ww  .jav a  2s.co m*/
}

From source file:Main.java

public static boolean fileCopy(File srcFile, File dstFile) {
    int length = 1048891;
    FileChannel inC = null;/*from ww w.j  a v  a  2s.  c o  m*/
    FileChannel outC = null;
    try {
        FileInputStream in = new FileInputStream(srcFile);
        FileOutputStream out = new FileOutputStream(dstFile);
        inC = in.getChannel();
        outC = out.getChannel();
        ByteBuffer b = null;
        while (inC.position() < inC.size()) {
            if ((inC.size() - inC.position()) < length) {
                length = (int) (inC.size() - inC.position());
            } else {
                length = 1048891;
            }
            b = ByteBuffer.allocateDirect(length);
            inC.read(b);
            b.flip();
            outC.write(b);
            outC.force(false);
        }

        return true;
    } catch (IOException e) {
        e.printStackTrace();
        return false;
    } finally {
        try {
            if (inC != null && inC.isOpen()) {
                inC.close();
            }
            if (outC != null && outC.isOpen()) {
                outC.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

From source file:com.arrow.acn.client.utils.MD5Util.java

public static byte[] calcMD5Checksum(Path path) throws NoSuchAlgorithmException, IOException {
    MessageDigest md = MessageDigest.getInstance("MD5");
    try (SeekableByteChannel sbc = Files.newByteChannel(path)) {
        ByteBuffer buf = ByteBuffer.allocateDirect(BUFFER_SIZE);
        while (sbc.read(buf) > 0) {
            buf.flip();/*from  ww  w.  j a v a  2s.co m*/
            md.update(buf);
            buf.clear();
        }
    }
    return md.digest();
}

From source file:Main.java

static private void ensureSize(int n) {
    if (buffer.capacity() < n) {
        buffer = ByteBuffer.allocateDirect(n).order(ByteOrder.nativeOrder());
        bufferInt = buffer.asIntBuffer();
        bufferFloat = buffer.asFloatBuffer();
    }//  ww w  .  j  a va 2s. co  m
}

From source file:Main.java

public static IntBuffer createIntBuffer(final int size) {
    final IntBuffer buf = ByteBuffer.allocateDirect(SIZEOF_FLOAT * size).order(ByteOrder.nativeOrder())
            .asIntBuffer();//  w w  w .j av  a2 s  .c o m
    buf.clear();
    return buf;
}

From source file:Main.java

/**android methods*/

//Only for Android
public static IntBuffer makeFloatBuffer(int[] array) {
    final int integerSize = Integer.SIZE / 8;
    ByteBuffer byteBuffer = ByteBuffer.allocateDirect(array.length * integerSize);
    byteBuffer.order(ByteOrder.nativeOrder());
    IntBuffer intBuffer = byteBuffer.asIntBuffer();
    intBuffer.put(array);/*from w  w w  . ja va 2  s  .  c o  m*/
    intBuffer.position(0);
    return intBuffer;
}

From source file:Main.java

public static FloatBuffer makeFloatBuffer(float[] array) {
    final int floatSize = Float.SIZE / 8;
    ByteBuffer byteBuffer = ByteBuffer.allocateDirect(array.length * floatSize);
    byteBuffer.order(ByteOrder.nativeOrder());
    FloatBuffer floatBuffer = byteBuffer.asFloatBuffer();
    floatBuffer.put(array);/*from  w  w w .  j  a  v a 2 s. c  o  m*/
    floatBuffer.position(0);
    return floatBuffer;
}