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:eu.pursuit.core.ScopeID.java

public byte[] toByteArray() {
    ByteBuffer buffer = ByteBuffer.allocate(getLength());
    fill(buffer);
    return buffer.array();
}

From source file:jext2.SymlinkInode.java

@NotThreadSafe(useLock = true)
private void writeSlowSymlink(String link, int size) throws JExt2Exception, NoSpaceLeftOnDevice, FileTooLarge {
    ByteBuffer buf = ByteBuffer.allocate(Ext2fsDataTypes.getStringByteLength(link));
    Ext2fsDataTypes.putString(buf, link, buf.capacity(), 0);
    buf.rewind();/*from   ww w.  ja va  2 s.  com*/
    writeData(buf, 0);
}

From source file:fr.ortolang.diffusion.security.authentication.TOTPHelper.java

private static int generateTOTP(String secret, long time) {
    Base32 codec = new Base32();
    byte[] decodedKey = codec.decode(secret);
    byte[] msg = ByteBuffer.allocate(8).putLong(time).array();
    byte[] hash = hmacSha(decodedKey, msg);
    int offset = hash[hash.length - 1] & 0xf;
    int binary = ((hash[offset] & 0x7f) << 24) | ((hash[offset + 1] & 0xff) << 16)
            | ((hash[offset + 2] & 0xff) << 8) | (hash[offset + 3] & 0xff);
    return binary % 1000000;
}

From source file:com.byteatebit.nbecho.NbEchoService.java

public NbEchoService(INbContext nbContext, SocketChannel socket) {
    super(nbContext, socket);
    this.readDelimitedMessageTask = ReadDelimitedMessageTask.Builder.builder().withDelimiter(MESSAGE_DELIMITER)
            .withByteBuffer(ByteBuffer.allocate(2048)).build();
    this.writeMessageTask = WriteMessageTask.Builder.builder().withByteBuffer(ByteBuffer.allocate(2048))
            .build();//w w  w  . ja v a 2  s. c o m
}

From source file:Main.java

public static byte[] aesIGEencrypt(byte[] tmpAESiv, byte[] tmpAesKey, byte[] data) {
    try {//  ww w.  j a  v  a 2  s  . co  m

        ByteBuffer out = ByteBuffer.allocate(data.length);

        byte[] ivp = Arrays.copyOfRange(tmpAESiv, 0, tmpAESiv.length / 2);
        byte[] iv2p = Arrays.copyOfRange(tmpAESiv, tmpAESiv.length / 2, tmpAESiv.length);

        int len = data.length / AES_BLOCK_SIZE;

        byte[] xorInput = null;
        byte[] xorOutput = null;

        SecretKeySpec keySpec = null;
        keySpec = new SecretKeySpec(tmpAesKey, "AES");
        Cipher cipher = null;
        cipher = Cipher.getInstance("AES/ECB/NoPadding");
        cipher.init(Cipher.ENCRYPT_MODE, keySpec);

        byte[] input = null;
        byte[] output = null;

        for (int i = 0; i < len; i++) {

            input = Arrays.copyOfRange(data, i * AES_BLOCK_SIZE, (i + 1) * AES_BLOCK_SIZE);
            xorInput = xor(input, ivp);
            output = cipher.doFinal(xorInput);
            xorOutput = xor(output, iv2p);
            out.put(xorOutput);

            ivp = xorOutput;
            iv2p = input;
        }
        return out.array();
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    } catch (NoSuchPaddingException e) {
        e.printStackTrace();
    } catch (IllegalBlockSizeException e) {
        e.printStackTrace();
    } catch (BadPaddingException e) {
        e.printStackTrace();
    } catch (InvalidKeyException e) {
        e.printStackTrace();
    }
    return null;
}

From source file:Main.java

public final static ByteBuffer borrowByteBufferVeryLarge() {
    if (byteBuffersPoolVeryLarge.isEmpty()) {
        return ByteBuffer.allocate(MAX_LINE_BYTES_VERY_LARGE);
    } else {//from w w  w.  j a va  2 s .  c om
        return byteBuffersPoolVeryLarge.remove(0);
    }
}

From source file:Main.java

public static String largeFileSha1(File file) {
    InputStream inputStream = null;
    try {//from  w  ww .j a  v  a 2 s .  c o  m
        MessageDigest gsha1 = MessageDigest.getInstance("SHA1");
        MessageDigest sha1 = MessageDigest.getInstance("SHA1");
        inputStream = new BufferedInputStream(new FileInputStream(file));
        byte[] buffer = new byte[1024];
        int nRead = 0;
        int block = 0;
        int count = 0;
        final int BLOCK_SIZE = 4 * 1024 * 1024;
        while ((nRead = inputStream.read(buffer)) != -1) {
            count += nRead;
            sha1.update(buffer, 0, nRead);
            if (BLOCK_SIZE == count) {
                gsha1.update(sha1.digest());
                sha1 = MessageDigest.getInstance("SHA1");
                block++;
                count = 0;
            }
        }
        if (count != 0) {
            gsha1.update(sha1.digest());
            block++;
        }
        byte[] digest = gsha1.digest();

        byte[] blockBytes = ByteBuffer.allocate(4).order(ByteOrder.LITTLE_ENDIAN).putInt(block).array();

        byte[] result = ByteBuffer.allocate(4 + digest.length).put(blockBytes, 0, blockBytes.length)
                .put(digest, 0, digest.length).array();

        return Base64.encodeToString(result, Base64.URL_SAFE | Base64.NO_WRAP);
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        if (inputStream != null) {
            try {
                inputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    return null;
}

From source file:com.byteatebit.nbserver.simple.SimpleNbServerTestTcpService.java

public SimpleNbServerTestTcpService(INbContext nbContext, SocketChannel socket) {
    super(nbContext, socket);
    this.readDelimitedMessageTask = ReadDelimitedMessageTask.Builder.builder().withDelimiter(MESSAGE_DELIMITER)
            .withByteBuffer(ByteBuffer.allocate(2048)).build();
    this.writeMessageTask = WriteMessageTask.Builder.builder().withByteBuffer(ByteBuffer.allocate(2048))
            .build();/*  w  ww  . j a v  a  2 s. c o  m*/
}

From source file:FindInt.java

public int seek() throws IOException {
    int num = -1;

    try (SeekableByteChannel fc = Files.newByteChannel(file)) {

        ByteBuffer buf = ByteBuffer.allocate(8);

        //Get the offset into the file.
        fc.read(buf);/*  www  .  j ava2 s  .  c  o  m*/
        long offset = buf.getLong(0);

        //Seek to the offset location.
        fc.position(offset);
        buf.rewind();

        //Read the 'secret' value.
        fc.read(buf);
        num = buf.getInt(0);
    } catch (IOException x) {
        System.err.println(x);
    }
    return num;
}

From source file:com.spotify.heroic.metric.datastax.schema.legacy.MapSerializer.java

@Override
public ByteBuffer serialize(final Map<A, B> value) throws IOException {
    final List<Pair<ByteBuffer, ByteBuffer>> buffers = new ArrayList<>();

    short size = 0;

    for (final Map.Entry<A, B> e : value.entrySet()) {
        final ByteBuffer key = a.serialize(e.getKey());
        final ByteBuffer val = b.serialize(e.getValue());

        size += key.limit() + val.limit();

        buffers.add(Pair.of(key, val));
    }/*from  ww w. ja va2s  .com*/

    final ByteBuffer buffer = ByteBuffer.allocate(4 + 8 * value.size() + size);
    buffer.putShort((short) buffers.size());

    for (final Pair<ByteBuffer, ByteBuffer> p : buffers) {
        buffer.putShort((short) p.getLeft().remaining());
        buffer.put(p.getLeft());
        buffer.putShort((short) p.getRight().remaining());
        buffer.put(p.getRight());
    }

    buffer.flip();
    return buffer;
}