Pack chunks : Array Insert Remove « Collections Data Structure « Java

1. Java
2. Collections Data Structure
3. Array Insert Remove

Pack chunks

       
/**
 * Vosao CMS. Simple CMS for Google App Engine.
 * 
 * Copyright (C) 2009-2010 Vosao development team.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * email: vosao.dev@gmail.com
 */

//package org.vosao.utils;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class ArrayUtil {

  public static List<byte[]> makeChunks(byte[] data, int chunkSize) {
    List<byte[]> result = new ArrayList<byte[]>();
    long n = data.length / chunkSize;
    int finalChunkSize = data.length % chunkSize;
    int i = 0;
    int start;
    int end;
    for (i = 0; i < n; i++) {
      start = i * chunkSize;
      end = start + chunkSize;
      result.add(Arrays.copyOfRange(data, start, end));
    }
    if (finalChunkSize > 0) {
      start = i * chunkSize;
      end = start + finalChunkSize;
      result.add(Arrays.copyOfRange(data, start, end));
    }
    return result;
  }
  
  public static byte[] packChunks(List<byte[]> data) {
    int size = 0;
    for (byte[] chunk : data) {
      size += chunk.length;
    }
    byte[] result = new byte[size];
    int start = 0;
    for (byte[] chunk : data) {
      System.arraycopy(chunk, 0, result, start, chunk.length);
      start += chunk.length;
    }
    return result;
  }
  
}

   
    
    
    
    
    
    
  

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