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;
}
}