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Rapidoid Commons

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/*-
 * #%L
 * rapidoid-commons
 * %%
 * Copyright (C) 2014 - 2018 Nikolche Mihajlovski and contributors
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */

package org.rapidoid.util;

import org.rapidoid.RapidoidThing;
import org.rapidoid.annotation.Authors;
import org.rapidoid.annotation.Since;

import java.nio.ByteBuffer;


@Authors("Nikolche Mihajlovski")
@Since("2.0.0")
public class Bufs extends RapidoidThing {

	public static ByteBuffer expand(ByteBuffer buf, int newSize) {
		ByteBuffer buf2 = ByteBuffer.allocate(newSize);

		ByteBuffer buff = buf.duplicate();
		buff.rewind();
		buff.limit(buff.capacity());

		buf2.put(buff);

		return buf2;
	}

	public static ByteBuffer expand(ByteBuffer buf) {
		int cap = buf.capacity();

		if (cap <= 1000) {
			cap *= 10;
		} else if (cap <= 10000) {
			cap *= 5;
		} else {
			cap *= 2;
		}

		return expand(buf, cap);
	}

	public static String buf2str(ByteBuffer buf) {
		return new String(buf2bytes(buf));
	}

	public static byte[] buf2bytes(ByteBuffer buf) {
		ByteBuffer buf2 = buf.duplicate();

		buf2.rewind();
		buf2.limit(buf2.capacity());

		byte[] bytes = new byte[buf2.capacity()];
		buf2.get(bytes);

		return bytes;
	}

	public static int[] buf2ubytes(ByteBuffer buf) {
		byte[] bytes = buf2bytes(buf);
		int[] ubytes = new int[bytes.length];

		for (int i = 0; i < bytes.length; i++) {
			ubytes[i] = Msc.ubyte(bytes[i]);
		}

		return ubytes;
	}

	public static ByteBuffer buf(String s) {
		byte[] bytes = s.getBytes();

		ByteBuffer buf = ByteBuffer.allocateDirect(bytes.length);
		buf.put(bytes);
		buf.rewind();

		return buf;
	}

}