Example usage for java.nio ByteBuffer limit

Introduction

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

Prototype

public final int limit()

Source Link

Document

Returns the limit of this buffer.

Usage

From source file:io.alicorn.server.http.LoginEndpoint.java

public static String hash(char[] chars) {
    //Parse chars into bytes for hashing.
    CharBuffer charBuffer = CharBuffer.wrap(chars);
    ByteBuffer byteBuffer = charset.encode(charBuffer);
    byte[] bytes = Arrays.copyOfRange(byteBuffer.array(), byteBuffer.position(), byteBuffer.limit());

    //Clear temporary arrays of any data.
    Arrays.fill(charBuffer.array(), '\u0000');
    Arrays.fill(byteBuffer.array(), (byte) 0);

    //Generate the SHA-256 hash.
    String hash = hash(bytes);/*from  w  w w.  j  a v  a  2  s.c om*/

    //Clear remaining arrays of any data.
    Arrays.fill(bytes, (byte) 0);

    return hash;
}

From source file:com.icloud.framework.core.nio.ByteBufferUtil.java

public static ByteBuffer clone(ByteBuffer o) {
    assert o != null;

    if (o.remaining() == 0)
        return ByteBuffer.wrap(ArrayUtils.EMPTY_BYTE_ARRAY);

    ByteBuffer clone = ByteBuffer.allocate(o.remaining());

    if (o.isDirect()) {
        for (int i = o.position(); i < o.limit(); i++) {
            clone.put(o.get(i));//from   w  w  w. ja v a  2  s  . c o  m
        }
        clone.flip();
    } else {
        System.arraycopy(o.array(), o.arrayOffset() + o.position(), clone.array(), 0, o.remaining());
    }

    return clone;
}

From source file:de.csdev.ebus.utils.EBusUtils.java

/**
 * Convert a ByteBuffer to a byte array/*from  w w w  .  j a v  a 2  s . c o  m*/
 *
 * @param buffer
 * @return
 */
public static byte[] toByteArray(ByteBuffer buffer) {

    int size = 0;
    if (buffer.position() == 0) {
        size = buffer.limit();
    } else {
        size = buffer.position();
    }

    byte[] data = new byte[size];
    ((ByteBuffer) buffer.duplicate().clear()).get(data);
    return data;
}

From source file:Main.java

public static ReadableByteChannel asReadableByteChannel(final ByteBuffer buffer) {

    return new ReadableByteChannel() {

        private boolean open = true;

        public int read(ByteBuffer dst) throws IOException {
            if (open == false) {
                throw new ClosedChannelException();
            }/*  w ww.  j a  v a  2 s  .  co  m*/

            final int p = buffer.position();
            final int l = buffer.limit();
            final int r = dst.remaining();

            buffer.limit(p + r);

            dst.put(buffer);

            buffer.limit(l);

            return r;
        }

        public void close() throws IOException {
            open = false;
        }

        public boolean isOpen() {
            return open;
        }

    };
}

From source file:de.csdev.ebus.utils.EBusUtils.java

/**
 * Generates a string hex dump from a ByteBuffer
 *
 * @param data The source//from  w  w  w.  ja  v  a 2 s  .  c  om
 * @return The StringBuilder with hex dump
 */
static public StringBuilder toHexDumpString(ByteBuffer data) {

    int size = 0;
    if (data.position() == 0) {
        size = data.limit();
    } else {
        size = data.position();
    }

    StringBuilder sb = new StringBuilder();
    for (int i = 0; i < size; i++) {
        byte c = data.get(i);
        if (i > 0) {
            sb.append(' ');
        }
        sb.append(toHexDumpString(c));
    }
    return sb;
}

From source file:Main.java

/**
 * @return//w w  w  .ja v  a2s .c  om
 */
public static WritableByteChannel asWritableByteChannel(final ByteBuffer buffer) {
    return new WritableByteChannel() {

        private boolean open = true;

        public int write(ByteBuffer src) throws IOException {
            if (open == false) {
                throw new ClosedChannelException();
            }

            final int p = buffer.position();
            final int l = buffer.limit();
            final int r = src.remaining();

            buffer.limit(l + r);
            buffer.position(l);

            buffer.put(src);

            buffer.position(p);

            return r;
        }

        public void close() throws IOException {
            open = false;
        }

        public boolean isOpen() {
            return open;
        }

    };
}

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  w  w . j av a 2  s.c om
        buffer.duplicate().get(bytes, buffer.position(), bytes.length);
    }
    return bytes;
}

From source file:org.commoncrawl.service.queryserver.master.S3Helper.java

static int scanForGZIPHeader(ByteBuffer byteBuffer) throws IOException {

    LOG.info("*** SCANNING FOR GZIP MAGIC Bytes:" + Byte.toString((byte) StreamingArcFileReader.GZIP_MAGIC)
            + " " + Byte.toString((byte) (StreamingArcFileReader.GZIP_MAGIC >> 8)) + " BufferSize is:"
            + byteBuffer.limit() + " Remaining:" + byteBuffer.remaining());
    int limit = byteBuffer.limit();

    while (byteBuffer.position() + 2 < limit) {
        //LOG.info("Reading Byte At:"+ byteBuffer.position());
        int b = byteBuffer.get();
        //LOG.info("First Byte is:"+ b);
        if (b == (byte) (StreamingArcFileReader.GZIP_MAGIC)) {

            byteBuffer.mark();/*w  w  w .  ja v  a2 s . c  om*/

            byte b2 = byteBuffer.get();
            //LOG.info("Second Byte is:"+ b2);
            if (b2 == (byte) (StreamingArcFileReader.GZIP_MAGIC >> 8)) {

                byte b3 = byteBuffer.get();
                if (b3 == Deflater.DEFLATED) {
                    LOG.info("Found GZip Magic at:" + (byteBuffer.position() - 3));
                    return byteBuffer.position() - 3;
                }
            }
            byteBuffer.reset();
        }
    }
    LOG.error("Failed to Find GZIP Magic!!");
    //LOG.error(Arrays.toString(byteBuffer.array()));
    return -1;
}

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

public static String bytesToHex(ByteBuffer bytes) {
    StringBuilder sb = new StringBuilder();
    for (int i = bytes.position() + bytes.arrayOffset(); i < bytes.limit() + bytes.arrayOffset(); i++) {
        int bint = bytes.array()[i] & 0xff;
        if (bint <= 0xF)
            // toHexString does not 0 pad its results.
            sb.append("0");
        sb.append(Integer.toHexString(bint));
    }/*  ww  w . j  av a 2  s .  c o  m*/
    return sb.toString();
}

From source file:Main.java

public static ByteBuffer clone(final ByteBuffer buf) {
    if (buf == null) {
        return null;
    }//from   w  w w. j  a  va  2s. c o  m
    buf.rewind();

    final ByteBuffer copy;
    if (buf.isDirect()) {
        copy = createByteBuffer(buf.limit());
    } else {
        copy = createByteBufferOnHeap(buf.limit());
    }
    copy.put(buf);

    return copy;
}