Java ByteBuffer Copy copy2Buffer(byte[] src, int srcOff, int srcLen, ByteBuffer dst, int dstOff)

Description

copy Buffer

License

Open Source License

Declaration

public static void copy2Buffer(byte[] src, int srcOff, int srcLen, ByteBuffer dst, int dstOff) 

Method Source Code

//package com.java2s;
/*//  w ww  .ja v  a 2s. co  m
 * ByteBufferUtil.java - An utility for ByteBuffer.
 * 
 * Copyright (c) 2009-2015 PIAX development team
 * Copyright (c) 2006-2008 Osaka University
 * Copyright (c) 2004-2005 BBR Inc, Osaka University
 * 
 * Permission is hereby granted, free of charge, to any person obtaining 
 * a copy of this software and associated documentation files (the 
 * "Software"), to deal in the Software without restriction, including 
 * without limitation the rights to use, copy, modify, merge, publish, 
 * distribute, sublicense, and/or sell copies of the Software, and to 
 * permit persons to whom the Software is furnished to do so, subject to 
 * the following conditions:
 * 
 * The above copyright notice and this permission notice shall be 
 * included in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY 
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 * 
 * $Id: ByteBufferUtil.java 1176 2015-05-23 05:56:40Z teranisi $
 */

import java.nio.ByteBuffer;

public class Main {
    static final int DEFAULT_ENHANCE_SIZE = 256;

    public static void copy2Buffer(byte[] src, int srcOff, int srcLen, ByteBuffer dst, int dstOff) {
        dst.reset(); // position <- mark
        dst.position(dst.position() + dstOff);
        dst.put(src, srcOff, srcLen);
        dst.reset();
    }

    public static void reset(int offset, ByteBuffer b) {
        b.position(offset);
        b.mark(); // mark = position
    }

    public static ByteBuffer put(ByteBuffer bbuf, byte[] post) {
        ByteBuffer b = bbuf;
        int postLen = post.length;
        if (postLen == 0)
            return b;
        if (postLen > bbuf.remaining()) {
            // enhance the ByteBuffer
            int esize = DEFAULT_ENHANCE_SIZE + postLen - bbuf.remaining();
            b = enhance(bbuf, esize);
        }
        b.put(post);
        return b;
    }

    public static ByteBuffer put(ByteBuffer bbuf, ByteBuffer post) {
        ByteBuffer b = bbuf;
        int postLen = post.remaining();
        if (postLen == 0)
            return b;
        if (postLen > bbuf.remaining()) {
            // enhance the ByteBuffer
            int esize = DEFAULT_ENHANCE_SIZE + postLen - bbuf.remaining();
            b = enhance(bbuf, esize);
        }
        b.put(post);
        rewind(post);
        return b;
    }

    public static void mark(ByteBuffer b) {
        b.mark(); // mark = position
    }

    public static ByteBuffer enhance(int size, ByteBuffer bbuf) {
        ByteBuffer bbuf2 = ByteBuffer.wrap(new byte[bbuf.capacity() + size]);
        bbuf2.limit(bbuf.limit() + size);
        bbuf2.position(bbuf.position() + size);
        bbuf2.mark();
        bbuf2.put(bbuf);
        rewind(bbuf2);
        return bbuf2;
    }

    public static ByteBuffer enhance(ByteBuffer bbuf, int size) {
        byte[] b = new byte[bbuf.capacity() + size];
        System.arraycopy(bbuf.array(), 0, b, 0, bbuf.limit());
        ByteBuffer bbuf2 = ByteBuffer.wrap(b);
        bbuf2.limit(bbuf.limit() + size);
        // save current position and mark
        int pos = bbuf.position();
        bbuf.reset();
        int mark = bbuf.position();
        // restore to bbuf2
        bbuf2.position(mark);
        bbuf2.mark();
        bbuf2.position(pos);
        return bbuf2;
    }

    public static void rewind(ByteBuffer b) {
        b.reset(); // position = mark
    }
}

Related

1. copy(ByteBuffer src, ByteBuffer dst)
2. copy(ByteBuffer src, ByteBuffer dst, int length)
3. copy(ByteBuffer src, int srcStartindex, ByteBuffer dest, int destStartIndex, int length)
4. copy(ByteBuffer src, int startindex, int endindex)
5. copy(final ByteBuffer from, final ByteBuffer to)
6. copyBinary(final ByteBuffer orig)
7. copyBuffer(ByteBuffer dest, int pos1, ByteBuffer src, int len)
8. copyBufferToStream(OutputStream out, ByteBuffer in, int offset, int length)
9. copyByteBuffer(ByteBuffer buf)