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85af4a022d
Since we now require Android SDK 19 or higher, we can use the method directly.
110 lines
4.1 KiB
Java
110 lines
4.1 KiB
Java
/**
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*
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* Copyright 2013-2020 Florian Schmaus
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jivesoftware.smack.compression;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.util.zip.Deflater;
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import java.util.zip.DeflaterOutputStream;
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import java.util.zip.Inflater;
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import java.util.zip.InflaterInputStream;
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/**
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* This class provides XMPP "zlib" compression with the help of the Deflater class of the Java API.
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* Note that the method needed for compression with synchronous flush support is available since
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* Java7, so it will only work with Java7 or higher (hence it's name). On Android, the required
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* <code>deflate()</code> method is available on API 19 or higher.
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* <p>
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* See also:
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* <ul>
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* <li><a href="http://docs.oracle.com/javase/7/docs/api/java/util/zip/Deflater.html#deflate(byte[],%20int,%20int,%20int)">The required deflate() method (Java7)</a>
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* <li><a href="http://developer.android.com/reference/java/util/zip/Deflater.html#deflate(byte[],%20int,%20int,%20int)">The required deflate() method (Android)</a>
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* </ul>
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*
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* @author Florian Schmaus
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*/
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public class Java7ZlibInputOutputStream extends XMPPInputOutputStream {
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private static final int compressionLevel = Deflater.DEFAULT_COMPRESSION;
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public Java7ZlibInputOutputStream() {
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super("zlib");
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}
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@Override
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public boolean isSupported() {
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return true;
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}
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@Override
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public InputStream getInputStream(InputStream inputStream) {
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return new InflaterInputStream(inputStream, new Inflater(), 512) {
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/**
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* Provide a more InputStream compatible version. A return value of 1 means that it is likely to read one
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* byte without blocking, 0 means that the system is known to block for more input.
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*
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* @return 0 if no data is available, 1 otherwise
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* @throws IOException if an I/O error occurred.
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*/
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@Override
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public int available() throws IOException {
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/*
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* aSmack related remark (where KXmlParser is used):
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* This is one of the funny code blocks. InflaterInputStream.available violates the contract of
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* InputStream.available, which breaks kXML2.
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*
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* I'm not sure who's to blame, oracle/sun for a broken api or the google guys for mixing a sun bug with
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* a xml reader that can't handle it....
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*
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* Anyway, this simple if breaks suns distorted reality, but helps to use the api as intended.
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*/
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if (inf.needsInput()) {
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return 0;
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}
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return super.available();
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}
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};
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}
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@Override
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public OutputStream getOutputStream(OutputStream outputStream) {
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final int flushMethodInt;
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switch (flushMethod) {
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case SYNC_FLUSH:
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flushMethodInt = Deflater.SYNC_FLUSH;
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break;
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case FULL_FLUSH:
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flushMethodInt = Deflater.FULL_FLUSH;
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break;
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default:
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throw new AssertionError();
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}
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return new DeflaterOutputStream(outputStream, new Deflater(compressionLevel)) {
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@Override
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public void flush() throws IOException {
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int count;
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while ((count = def.deflate(buf, 0, buf.length, flushMethodInt)) > 0) {
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out.write(buf, 0, count);
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}
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super.flush();
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}
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};
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}
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}
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