cleanup: removed stream compression
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iNPUTmice
parent
5acd471880
commit
9d52f62767
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@ -1,54 +0,0 @@
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package eu.siacs.conversations.utils.zlib;
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import java.io.IOException;
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import java.io.InputStream;
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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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* ZLibInputStream is a zlib and input stream compatible version of an
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* InflaterInputStream. This class solves the incompatibility between
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* {@link InputStream#available()} and {@link InflaterInputStream#available()}.
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*/
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public class ZLibInputStream extends InflaterInputStream {
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/**
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* Construct a ZLibInputStream, reading data from the underlying stream.
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*
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* @param is
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* The {@code InputStream} to read data from.
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* @throws IOException
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* If an {@code IOException} occurs.
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*/
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public ZLibInputStream(InputStream is) throws IOException {
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super(is, new Inflater(), 512);
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}
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/**
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* Provide a more InputStream compatible version of available. A return
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* value of 1 means that it is likly to read one byte without blocking, 0
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* 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
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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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* This is one of the funny code blocks. InflaterInputStream.available
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* violates the contract of 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
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* google guys for mixing a sun bug with a xml reader that can't handle
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* it....
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*
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* Anyway, this simple if breaks suns distorted reality, but helps to
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* 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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@ -1,95 +0,0 @@
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package eu.siacs.conversations.utils.zlib;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.security.NoSuchAlgorithmException;
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import java.util.zip.Deflater;
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import java.util.zip.DeflaterOutputStream;
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/**
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* <p>
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* Android 2.2 includes Java7 FLUSH_SYNC option, which will be used by this
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* Implementation, preferable via reflection. The @hide was remove in API level
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* 19. This class might thus go away in the future.
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* </p>
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* <p>
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* Please use {@link ZLibOutputStream#SUPPORTED} to check for flush
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* compatibility.
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* </p>
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*/
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public class ZLibOutputStream extends DeflaterOutputStream {
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/**
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* The reflection based flush method.
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*/
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private final static Method method;
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/**
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* SUPPORTED is true if a flush compatible method exists.
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*/
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public final static boolean SUPPORTED;
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/**
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* Static block to initialize {@link #SUPPORTED} and {@link #method}.
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*/
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static {
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Method m = null;
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try {
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m = Deflater.class.getMethod("deflate", byte[].class, int.class,
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int.class, int.class);
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} catch (SecurityException e) {
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} catch (NoSuchMethodException e) {
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}
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method = m;
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SUPPORTED = (method != null);
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}
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/**
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* Create a new ZLib compatible output stream wrapping the given low level
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* stream. ZLib compatiblity means we will send a zlib header.
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*
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* @param os
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* OutputStream The underlying stream.
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* @throws IOException
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* In case of a lowlevel transfer problem.
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* @throws NoSuchAlgorithmException
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* In case of a {@link Deflater} error.
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*/
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public ZLibOutputStream(OutputStream os) throws IOException,
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NoSuchAlgorithmException {
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super(os, new Deflater(Deflater.BEST_COMPRESSION));
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}
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/**
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* Flush the given stream, preferring Java7 FLUSH_SYNC if available.
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*
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* @throws IOException
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* In case of a lowlevel exception.
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*/
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@Override
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public void flush() throws IOException {
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if (!SUPPORTED) {
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super.flush();
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return;
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}
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try {
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int count = 0;
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do {
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count = (Integer) method.invoke(def, buf, 0, buf.length, 3);
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if (count > 0) {
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out.write(buf, 0, count);
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}
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} while (count > 0);
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} catch (IllegalArgumentException e) {
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throw new IOException("Can't flush");
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} catch (IllegalAccessException e) {
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throw new IOException("Can't flush");
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} catch (InvocationTargetException e) {
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throw new IOException("Can't flush");
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}
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super.flush();
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}
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}
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@ -50,8 +50,6 @@ import eu.siacs.conversations.crypto.sasl.ScramSha1;
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import eu.siacs.conversations.entities.Account;
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import eu.siacs.conversations.services.XmppConnectionService;
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import eu.siacs.conversations.utils.DNSHelper;
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import eu.siacs.conversations.utils.zlib.ZLibInputStream;
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import eu.siacs.conversations.utils.zlib.ZLibOutputStream;
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import eu.siacs.conversations.xml.Element;
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import eu.siacs.conversations.xml.Tag;
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import eu.siacs.conversations.xml.TagWriter;
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@ -92,7 +90,6 @@ public class XmppConnection implements Runnable {
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private int smVersion = 3;
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private SparseArray<String> messageReceipts = new SparseArray<>();
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private boolean enabledCompression = false;
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private boolean enabledEncryption = false;
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private boolean enabledCarbons = false;
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@ -144,7 +141,6 @@ public class XmppConnection implements Runnable {
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protected void connect() {
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Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": connecting");
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enabledCompression = false;
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enabledEncryption = false;
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lastConnect = SystemClock.elapsedRealtime();
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lastPingSent = SystemClock.elapsedRealtime();
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@ -261,8 +257,6 @@ public class XmppConnection implements Runnable {
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processStreamFeatures(nextTag);
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} else if (nextTag.isStart("proceed")) {
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switchOverToTls(nextTag);
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} else if (nextTag.isStart("compressed")) {
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switchOverToZLib(nextTag);
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} else if (nextTag.isStart("success")) {
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final String challenge = tagReader.readElement(nextTag).getContent();
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try {
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@ -498,28 +492,6 @@ public class XmppConnection implements Runnable {
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}
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}
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private void sendCompressionZlib() throws IOException {
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Element compress = new Element("compress");
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compress.setAttribute("xmlns", "http://jabber.org/protocol/compress");
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compress.addChild("method").setContent("zlib");
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tagWriter.writeElement(compress);
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}
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private void switchOverToZLib(final Tag currentTag)
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throws XmlPullParserException, IOException,
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NoSuchAlgorithmException {
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tagReader.readTag(); // read tag close
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tagWriter.setOutputStream(new ZLibOutputStream(tagWriter
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.getOutputStream()));
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tagReader
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.setInputStream(new ZLibInputStream(tagReader.getInputStream()));
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sendStartStream();
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Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": compression enabled");
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enabledCompression = true;
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processStream(tagReader.readTag());
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}
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private void sendStartTLS() throws IOException {
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Tag startTLS = Tag.empty("starttls");
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startTLS.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-tls");
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@ -601,8 +573,6 @@ public class XmppConnection implements Runnable {
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this.streamFeatures = tagReader.readElement(currentTag);
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if (this.streamFeatures.hasChild("starttls") && !enabledEncryption) {
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sendStartTLS();
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} else if (compressionAvailable()) {
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sendCompressionZlib();
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} else if (this.streamFeatures.hasChild("register")
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&& account.isOptionSet(Account.OPTION_REGISTER)
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&& enabledEncryption) {
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@ -658,28 +628,6 @@ public class XmppConnection implements Runnable {
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}
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}
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private boolean compressionAvailable() {
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if (!this.streamFeatures.hasChild("compression",
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"http://jabber.org/features/compress"))
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return false;
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if (!ZLibOutputStream.SUPPORTED)
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return false;
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if (!account.isOptionSet(Account.OPTION_USECOMPRESSION))
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return false;
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Element compression = this.streamFeatures.findChild("compression",
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"http://jabber.org/features/compress");
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for (Element child : compression.getChildren()) {
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if (!"method".equals(child.getName()))
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continue;
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if ("zlib".equalsIgnoreCase(child.getContent())) {
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return true;
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}
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}
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return false;
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}
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private List<String> extractMechanisms(Element stream) {
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ArrayList<String> mechanisms = new ArrayList<>(stream
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.getChildren().size());
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return connection
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.findDiscoItemByFeature("http://jabber.org/protocol/bytestreams") != null;
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}
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public boolean compression() {
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return connection.enabledCompression;
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}
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}
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}
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