Example usage for java.nio ByteBuffer allocate

Introduction

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

Prototype

public static ByteBuffer allocate(int capacity) 

Source Link

Document

Creates a byte buffer based on a newly allocated byte array.

Usage

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

@Test
public void test_tempRead() {
    ByteBuffer buffer = ByteBuffer.allocate(1024);

    buffer.put("Hello World".getBytes());
    buffer.flip();//from w ww .j a  v a 2 s  .  c om
    staging.writeTempReadBytes(buffer);
    Assert.assertTrue(staging.hasTempReadBytes());

    buffer.clear();
    staging.readTempReadBytes(buffer);
    Assert.assertEquals("Hello World",
            new String(ArrayUtils.subarray(buffer.array(), 0, "Hello World".getBytes().length)));
    staging.resetTempReadBytes();

    Assert.assertFalse(staging.hasTempReadBytes());
}

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From source file:Main.java

public static String completeJweFromSIM(String jweSIM) {
    // android.os.Debug.waitForDebugger();

    try {//w  ww  .  j a  v a2s  .  co m
        if (jweSIM != null && jweSIM.length() > 0) {
            String parts[] = jweSIM.split("\\.");
            ;
            if (parts != null && parts.length == 5) {
                // retrieve hmac key
                byte hmac_key[] = Base64.decode(parts[4], Base64.URL_SAFE);
                if (hmac_key != null && hmac_key.length == 16) {
                    // init hash instance
                    Mac hmac = Mac.getInstance("HmacSHA256", "SC");
                    hmac.init(new SecretKeySpec(hmac_key, "HmacSHA256"));

                    byte[] aad = parts[0].getBytes();
                    long al = aad.length * 8;
                    byte[] iv_key = decodeB64(parts[2]);
                    byte[] cryptedBytes = decodeB64(parts[3]);

                    // build data to hash
                    byte[] hmacData = new byte[aad.length + iv_key.length + cryptedBytes.length + 8];
                    int offset = 0;
                    System.arraycopy(aad, offset, hmacData, 0, aad.length);
                    offset += aad.length;
                    System.arraycopy(iv_key, 0, hmacData, offset, iv_key.length);
                    offset += iv_key.length;
                    System.arraycopy(cryptedBytes, 0, hmacData, offset, cryptedBytes.length);
                    offset += cryptedBytes.length;
                    ByteBuffer buffer = ByteBuffer.allocate(8);
                    buffer.putLong(al);
                    System.arraycopy(buffer.array(), 0, hmacData, offset, 8);

                    // compute hac value
                    byte[] hmacValue = hmac.doFinal(hmacData);
                    // authentication tag
                    byte[] auth_tag = Arrays.copyOf(hmacValue, 16);
                    String auth_tag64 = encodeB64(auth_tag);

                    // A.2.7. Complete Representation
                    String finalString = parts[0] + "." + parts[1] + "." + parts[2] + "." + parts[3] + "."
                            + auth_tag64;

                    //                  // just for verification
                    //                  byte jwt64 [] = decryptJWE(finalString, RsaKeyTim.privRsaKey);
                    //                  if(jwt64!=null) {
                    //                     String jws = new String(jwt64);
                    //                     Log.d("completeJweFromSIM", "jws verify Key TIM :"+verifyJWS(jws,RsaKeyTim.pubRsaKey));
                    //                  }

                    return finalString;
                }
            }
            // 
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

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From source file:com.alibaba.otter.shared.common.utils.ByteUtils.java

public static int bytes2int(byte[] b) {
    ByteBuffer buf = ByteBuffer.allocate(4);
    buf.put(b);/*www  .j ava 2  s  .c  o m*/
    buf.flip();
    return buf.getInt();
}

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From source file:me.whitmarbut.mfa.TOTP.java

private byte[] getHmac(int timestamp, byte[] key) throws NoSuchAlgorithmException, InvalidKeyException {
    SecretKeySpec key_spec = new SecretKeySpec(key, "HmacSHA1");
    Mac mac = Mac.getInstance("HmacSHA1");
    mac.init(key_spec);/*from   w  w  w.  j a  v  a  2s . c  o m*/
    byte[] bin_timestamp = ByteBuffer.allocate(4).putInt(timestamp).array();

    ByteBuffer bbuff = ByteBuffer.allocate(8);
    bbuff.putInt(0); //Left pad 4 bytes to make a 64 bit int
    bbuff.putInt(timestamp);

    return mac.doFinal(bbuff.array());
}

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From source file:backtype.storm.messaging.TaskMessage.java

public ByteBuffer serialize() {
    ByteBuffer bb = ByteBuffer.allocate(_message.length + 4);
    bb.putShort((short) _task);
    bb.putShort(remoteTuple);/*w  w  w .j  av a2  s. co m*/
    bb.put(_message);
    return bb;
}

---

From source file:com.talis.storage.s3.S3ObjectFactoryTest.java

@Before
public void setup() {
    bucketname = UUID.randomUUID().toString();
    factory = new S3ObjectFactory(bucketname);
    buffer = ByteBuffer.allocate(1024);
    buffer.put(entity);//from   w  w w  .j a  v a2  s .c  o m
}

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From source file:net.darkmist.alib.io.BufferUtil.java

/**
 * Allocate a buffer and fill it from a channel. The returned
 * buffer will be rewound to the begining.
 * @return Buffer containing size bytes from the channel.
 * @throws IOException if the channel read does.
 * @throws EOFException if a end of stream is encountered
 *    before the full size is read./*from w ww. ja v a2s .  com*/
 */
public static ByteBuffer allocateAndReadAll(int size, ReadableByteChannel channel) throws IOException {
    ByteBuffer buf = ByteBuffer.allocate(size);
    int justRead;
    int totalRead = 0;

    // FIXME, this will be a tight loop if the channel is non-blocking...
    while (totalRead < size) {
        logger.debug("reading totalRead={}", totalRead);
        if ((justRead = channel.read(buf)) < 0)
            throw new EOFException("Unexpected end of stream after reading " + totalRead + " bytes");
        totalRead += justRead;
    }
    buf.rewind();
    return buf;
}

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From source file:ru.jts_dev.common.tcp.ProtocolByteArrayLengthHeaderSerializer.java

@Override
protected void writeHeader(OutputStream outputStream, int length) throws IOException {
    ByteBuffer lengthPart = ByteBuffer.allocate(this.headerSize).order(LITTLE_ENDIAN);
    length += headerSize; // Protocol thing, length represent header size + data size
    switch (this.headerSize) {
    case HEADER_SIZE_INT:
        lengthPart.putInt(length);/*ww  w . java2s.c o m*/
        break;
    case HEADER_SIZE_UNSIGNED_BYTE:
        if (length > 0xff) {
            throw new IllegalArgumentException(
                    "Length header:" + headerSize + " too short to accommodate message length:" + length);
        }
        lengthPart.put((byte) length);
        break;
    case HEADER_SIZE_UNSIGNED_SHORT:
        if (length > 0xffff) {
            throw new IllegalArgumentException(
                    "Length header:" + headerSize + " too short to accommodate message length:" + length);
        }
        lengthPart.putShort((short) length);
        break;
    default:
        throw new IllegalArgumentException("Bad header size:" + headerSize);
    }
    outputStream.write(lengthPart.array());
}

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From source file:Main.java

public static byte[] makeFontBitmap(String font, String code, int size, float[] arrayOfPos) {
    Canvas c = new Canvas();
    Paint p = new Paint();
    float density = context.getResources().getDisplayMetrics().density;
    //        Log.v(TAG, String.format("makeFontBitmap called(Java): font=%s code=%s density=%f", font, code, density));
    p.setTextSize((float) size * density);
    p.setAntiAlias(true);/*from   ww w  .ja v  a  2s.  c  o  m*/

    Rect textBounds = new Rect();
    p.getTextBounds(code, 0, code.length(), textBounds);
    //        Log.v(TAG, String.format("makeFontBitmap textBounds: %d,%d,%d,%d", textBounds.left, textBounds.top, textBounds.right, textBounds.bottom));

    Rect textBoundsAxA = new Rect();
    String axa = String.format("A%sA", code);
    p.getTextBounds(axa, 0, axa.length(), textBoundsAxA);
    Rect textBoundsAA = new Rect();
    String aa = "AA";
    p.getTextBounds(aa, 0, aa.length(), textBoundsAA);

    // cache.distDelta = Vec2(0, 0);
    arrayOfPos[0] = textBounds.left;
    arrayOfPos[1] = textBounds.top;

    // cache.srcWidth = Vec2(16, 16);
    arrayOfPos[2] = textBounds.width();
    arrayOfPos[3] = textBounds.height();

    // cache.step = 16;
    //      arrayOfPos[4] = textBounds.width() + 1;
    arrayOfPos[4] = textBoundsAxA.width() - textBoundsAA.width();

    if (textBounds.width() == 0 || textBounds.height() == 0) {
        Log.v(TAG, "makeFontBitmap: empty");
        return null;
    }

    Bitmap b = Bitmap.createBitmap(textBounds.width(), textBounds.height(), Bitmap.Config.ARGB_8888);
    c.setBitmap(b);

    Rect r = new Rect(0, 0, textBounds.width(), textBounds.height());
    //      p.setColor(Color.RED);
    p.setARGB(0, 0, 0, 0);
    c.drawRect(r, p);
    p.setARGB(255, 255, 255, 255);

    //        Log.v(TAG, "makeFontBitmap: drawText");
    c.drawText(code, -textBounds.left, -textBounds.top, p);
    //        Log.v(TAG, String.format("makeFontBitmap: w=%.2f h=%.2f", arrayOfPos[2], arrayOfPos[3]));

    ByteBuffer buf = ByteBuffer.allocate(textBounds.width() * textBounds.height() * 4);
    //        Log.v(TAG, String.format("makeFontBitmap: b.getRowBytes() %d", b.getRowBytes()));
    buf.position(0);
    b.copyPixelsToBuffer(buf);
    //        Log.v(TAG, String.format("makeFontBitmap results: capacity=%d", buf.capacity()));

    return buf.array();
}

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From source file:biz.karms.sinkit.ejb.util.CIDRUtils.java

public static ImmutablePair<String, String> getStartEndAddresses(final String cidr)
        throws UnknownHostException {
    //TODO: This is silly. Refactor CIDRUtils so as to accept actual IPs as well as subnets.
    //TODO: Validate the thing before processing. Guava?
    final String fixedCIDR;
    if (!cidr.contains("/")) {
        //IPv6? Hmmm...
        if (cidr.contains(":")) {
            fixedCIDR = cidr + "/128";
        } else {//www  . j a va 2  s .  c  o m
            fixedCIDR = cidr + "/32";
        }
    } else {
        fixedCIDR = cidr;
    }
    final int index = fixedCIDR.indexOf("/");
    final InetAddress inetAddress = InetAddress.getByName(fixedCIDR.substring(0, index));
    final int prefixLength = Integer.parseInt(fixedCIDR.substring(index + 1));

    final ByteBuffer maskBuffer;
    if (inetAddress.getAddress().length == 4) {
        maskBuffer = ByteBuffer.allocate(4).putInt(-1);
    } else {
        maskBuffer = ByteBuffer.allocate(16).putLong(-1L).putLong(-1L);
    }

    final BigInteger mask = (new BigInteger(1, maskBuffer.array())).not().shiftRight(prefixLength);
    final ByteBuffer buffer = ByteBuffer.wrap(inetAddress.getAddress());
    final BigInteger ipVal = new BigInteger(1, buffer.array());
    final BigInteger startIp = ipVal.and(mask);
    final BigInteger endIp = startIp.add(mask.not());

    return new ImmutablePair<>(String.format("%040d", startIp), String.format("%040d", endIp));
}

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