/** -*- tab-width: 4 -*-
* This file is part of Erjang - A JVM-based Erlang VM
*
* Copyright (c) 2010 by Trifork
*
* 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.
**/
package erjang.m.zlib;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.Deflater;
import java.util.zip.DeflaterOutputStream;
import erjang.BIF;
import erjang.EBinary;
import erjang.ENative;
import erjang.EObject;
import erjang.ERT;
public class Native extends ENative {
@BIF
public static EBinary compress(EObject bin) {
EBinary b = bin.testBinary();
if (b == null) {
throw ERT.badarg(bin);
}
Deflater defl = new Deflater();
BARR bos = new BARR();
DeflaterOutputStream dos = new DeflaterOutputStream(bos, defl);
try {
b.writeTo(dos);
dos.close();
} catch (IOException e) {
throw new InternalError("should not happen");
}
return bos.asBinary();
}
static private class BARR extends ByteArrayOutputStream {
EBinary asBinary() {
return new EBinary(super.buf, 0, super.count);
}
}
}