Java Convert via ByteBuffer toAsciiBytes(String s)

Description

to Ascii Bytes

License

Open Source License

Declaration

public static ByteBuffer toAsciiBytes(String s) 

Method Source Code

//package com.java2s;
/*// ww w  . j  a  v  a  2  s.  c  o m
 * ***** BEGIN LICENSE BLOCK *****
 * Zimbra Collaboration Suite Server
 * Copyright (C) 2007, 2009, 2010, 2011, 2013, 2014, 2016 Synacor, Inc.
 *
 * This program is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software Foundation,
 * version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License along with this program.
 * If not, see <https://www.gnu.org/licenses/>.
 * ***** END LICENSE BLOCK *****
 */

import java.nio.ByteBuffer;

public class Main {
    public static final int INITIAL_CAPACITY = 32;

    public static ByteBuffer toAsciiBytes(String s) {
        return put(ByteBuffer.allocate(s.length()), s);
    }

    public static ByteBuffer put(ByteBuffer bb, String s) {
        bb = expand(bb, s.length());
        for (int i = 0; i < s.length(); i++) {
            bb.put(i, (byte) s.charAt(i));
        }
        return bb;
    }

    /**
     * Ensure that specified buffer has at least enough capacity to accommodate 'minSize' additional bytes, but not more
     * than 'maxSize' additional bytes. If 'maxSize' is 0, then there is no limit.
     *
     * @param bb the ByteBuffer to expand, or null to create a new one
     * @param minSize minimum additional capacity for resulting byte buffer
     * @param maxSize maximum additional capacity, or -1 for no maximum
     * @return the resulting, possible expanded, ByteBuffer
     */
    public static ByteBuffer expand(ByteBuffer bb, int minSize, int maxSize) {
        if (maxSize != -1 && maxSize < minSize) {
            throw new IllegalArgumentException("maxSize < minSize");
        }
        if (bb == null) {
            int size = Math.max(minSize, INITIAL_CAPACITY);
            if (maxSize != -1 && size > maxSize)
                size = maxSize;
            return ByteBuffer.allocate(size);
        }
        if (bb.remaining() >= minSize)
            return bb;
        int capacity = Math.max((bb.capacity() * 3) / 2 + 1, bb.position() + minSize);
        if (maxSize != -1) {
            capacity = Math.max(capacity, bb.position() + maxSize);
        }
        ByteBuffer tmp = ByteBuffer.allocate(capacity);
        bb.flip();
        return tmp.put(bb);
    }

    public static ByteBuffer expand(ByteBuffer bb, int minSize) {
        return expand(bb, minSize, -1);
    }
}

Related

1. toArray(final byte[] byteArray, final int sizeLimit)
2. toArray(int value)
3. toArray(IntBuffer src, int[] dst, int offset)
4. toArray(long length)
5. toASCII(String str)
6. toASCIIString(URI u)
7. toAttributeValue(Object value)
8. toBigDecimal(byte[] bytes, int scale)
9. toBigInteger(byte[] bytes)