Example usage for java.nio ByteBuffer position

Introduction

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

Prototype

public final int position()

Source Link

Document

Returns the position of this buffer.

Usage

From source file:com.linkedin.databus.core.DbusEventPart.java

/**
 * Decodes a bytebuffer and returns DbusEventPart. Preserves the ByteBuffer position.
 * @param buf//from   w w w.  jav  a  2  s.  c om
 * @return
 */
public static DbusEventPart decode(ByteBuffer buf) {
    int pos = buf.position();
    int dataLen = buf.getInt(pos);
    if (dataLen < 0) {
        throw new UnsupportedOperationException("Data length " + dataLen + " not supported");
    }
    short attributes = buf.getShort(pos + AttributesOffset);
    short schemaVersion = (short) (attributes >> VERSION_SHIFT);
    SchemaDigestType schemaDigestType = digestType(attributes);
    int digestLen = digestLen(schemaDigestType);
    byte[] digest = new byte[digestLen];
    for (int i = 0; i < digestLen; i++) {
        digest[i] = buf.get(pos + AttributesOffset + AttributesLen + i);
    }

    // NOTE - this will create a new ByteBuffer object pointing to the
    // same memory. So the position of this new BB is beginning of the data
    // and limit is set to the end of the data.
    ByteBuffer dataBuf = buf.asReadOnlyBuffer();
    dataBuf.position(pos + AttributesOffset + AttributesLen + digestLen);
    dataBuf.limit(dataBuf.position() + dataLen);

    return new DbusEventPart(schemaDigestType, digest, schemaVersion, dataBuf);
}

From source file:ch.cyberduck.core.http.DelayedHttpMultipartEntity.java

private static ByteArrayBuffer encode(final Charset charset, final String input) {
    final ByteBuffer encoded = charset.encode(CharBuffer.wrap(input));
    final ByteArrayBuffer bab = new ByteArrayBuffer(encoded.remaining());
    bab.append(encoded.array(), encoded.position(), encoded.remaining());
    return bab;//  w  w w.j a va2s.c o m
}

From source file:com.kotcrab.vis.editor.module.editor.AnalyticsModule.java

public static int truncateUtf8(String input, byte[] output) {
    ByteBuffer outBuf = ByteBuffer.wrap(output);
    CharBuffer inBuf = CharBuffer.wrap(input.toCharArray());

    Charset utf8 = Charset.forName("UTF-8");
    utf8.newEncoder().encode(inBuf, outBuf, true);
    return outBuf.position();
}

From source file:com.liveramp.commons.util.BytesUtils.java

public static String bytesToHexString(ByteBuffer b) {
    StringBuilder result = new StringBuilder();
    for (int i = 0; i < b.remaining(); ++i) {
        final int v = b.array()[b.arrayOffset() + b.position() + i] & 0xff;
        if (i > 0) {
            result.append(" ");
        }//from   ww  w.j  ava  2s. c  om
        if (v < 16) {
            result.append("0");
        }
        result.append(Integer.toString(v, 16));
    }
    return result.toString();
}

From source file:com.palantir.atlasdb.keyvalue.cassandra.CassandraKeyValueServices.java

static String convertCassandraByteBufferUUIDtoString(ByteBuffer uuid) {
    return new UUID(uuid.getLong(uuid.position()), uuid.getLong(uuid.position() + 8)).toString();
}

From source file:com.mcxiaoke.next.http.entity.mime.AbstractMultipartForm.java

private static ByteArrayBuffer encode(final Charset charset, final String string) {
    final ByteBuffer encoded = charset.encode(CharBuffer.wrap(string));
    final ByteArrayBuffer bab = new ByteArrayBuffer(encoded.remaining());
    bab.append(encoded.array(), encoded.position(), encoded.remaining());
    return bab;//w ww.  j ava  2s  . c om
}

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();
            }// www.  java 2s.  c  o 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

/**
 * Convert a ByteBuffer to a byte array//  ww  w  . j  a v a2 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

/**
 * Compute the sha-256 digest of data.//  w ww.j av  a  2 s .  c  o m
 * @param data The input byte buffer. This does not change the position.
 * @return The digest.
 */
public static byte[] digestSha256(ByteBuffer data) {
    MessageDigest sha256;
    try {
        sha256 = MessageDigest.getInstance("SHA-256");
    } catch (NoSuchAlgorithmException exception) {
        // Don't expect this to happen.
        throw new Error("MessageDigest: SHA-256 is not supported: " + exception.getMessage());
    }
    int savePosition = data.position();
    sha256.update(data);
    data.position(savePosition);
    return sha256.digest();
}

From source file:Main.java

/**
 * @return/*from   w  w  w.  j  a  v  a2 s .  c o m*/
 */
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;
        }

    };
}