| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.trevni; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.nio.ByteBuffer; |
| import java.util.zip.Deflater; |
| import java.util.zip.DeflaterOutputStream; |
| import java.util.zip.Inflater; |
| import java.util.zip.InflaterOutputStream; |
| |
| /** Implements DEFLATE (RFC1951) compression and decompression. */ |
| class DeflateCodec extends Codec { |
| private ByteArrayOutputStream outputBuffer; |
| private Deflater deflater; |
| private Inflater inflater; |
| |
| @Override |
| ByteBuffer compress(ByteBuffer data) throws IOException { |
| ByteArrayOutputStream baos = getOutputBuffer(data.remaining()); |
| writeAndClose(data, new DeflaterOutputStream(baos, getDeflater())); |
| return ByteBuffer.wrap(baos.toByteArray()); |
| } |
| |
| @Override |
| ByteBuffer decompress(ByteBuffer data) throws IOException { |
| ByteArrayOutputStream baos = getOutputBuffer(data.remaining()); |
| writeAndClose(data, new InflaterOutputStream(baos, getInflater())); |
| return ByteBuffer.wrap(baos.toByteArray()); |
| } |
| |
| private void writeAndClose(ByteBuffer data, OutputStream out) |
| throws IOException { |
| out.write(data.array(), data.position(), data.remaining()); |
| out.close(); |
| } |
| |
| private Inflater getInflater() { |
| if (null == inflater) |
| inflater = new Inflater(true); |
| inflater.reset(); |
| return inflater; |
| } |
| |
| private Deflater getDeflater() { |
| if (null == deflater) |
| deflater = new Deflater(Deflater.DEFAULT_COMPRESSION, true); |
| deflater.reset(); |
| return deflater; |
| } |
| |
| private ByteArrayOutputStream getOutputBuffer(int suggestedLength) { |
| if (null == outputBuffer) |
| outputBuffer = new ByteArrayOutputStream(suggestedLength); |
| outputBuffer.reset(); |
| return outputBuffer; |
| } |
| |
| } |