cleanup: removed stream compression

This commit is contained in:
iNPUTmice 2014-12-09 14:14:15 +01:00
parent 5acd471880
commit 9d52f62767
3 changed files with 0 additions and 205 deletions

View file

@ -1,54 +0,0 @@
package eu.siacs.conversations.utils.zlib;
import java.io.IOException;
import java.io.InputStream;
import java.util.zip.Inflater;
import java.util.zip.InflaterInputStream;
/**
* ZLibInputStream is a zlib and input stream compatible version of an
* InflaterInputStream. This class solves the incompatibility between
* {@link InputStream#available()} and {@link InflaterInputStream#available()}.
*/
public class ZLibInputStream extends InflaterInputStream {
/**
* Construct a ZLibInputStream, reading data from the underlying stream.
*
* @param is
* The {@code InputStream} to read data from.
* @throws IOException
* If an {@code IOException} occurs.
*/
public ZLibInputStream(InputStream is) throws IOException {
super(is, new Inflater(), 512);
}
/**
* Provide a more InputStream compatible version of available. A return
* value of 1 means that it is likly to read one byte without blocking, 0
* means that the system is known to block for more input.
*
* @return 0 if no data is available, 1 otherwise
* @throws IOException
*/
@Override
public int available() throws IOException {
/*
* This is one of the funny code blocks. InflaterInputStream.available
* violates the contract of InputStream.available, which breaks kXML2.
*
* I'm not sure who's to blame, oracle/sun for a broken api or the
* google guys for mixing a sun bug with a xml reader that can't handle
* it....
*
* Anyway, this simple if breaks suns distorted reality, but helps to
* use the api as intended.
*/
if (inf.needsInput()) {
return 0;
}
return super.available();
}
}

View file

@ -1,95 +0,0 @@
package eu.siacs.conversations.utils.zlib;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.security.NoSuchAlgorithmException;
import java.util.zip.Deflater;
import java.util.zip.DeflaterOutputStream;
/**
* <p>
* Android 2.2 includes Java7 FLUSH_SYNC option, which will be used by this
* Implementation, preferable via reflection. The @hide was remove in API level
* 19. This class might thus go away in the future.
* </p>
* <p>
* Please use {@link ZLibOutputStream#SUPPORTED} to check for flush
* compatibility.
* </p>
*/
public class ZLibOutputStream extends DeflaterOutputStream {
/**
* The reflection based flush method.
*/
private final static Method method;
/**
* SUPPORTED is true if a flush compatible method exists.
*/
public final static boolean SUPPORTED;
/**
* Static block to initialize {@link #SUPPORTED} and {@link #method}.
*/
static {
Method m = null;
try {
m = Deflater.class.getMethod("deflate", byte[].class, int.class,
int.class, int.class);
} catch (SecurityException e) {
} catch (NoSuchMethodException e) {
}
method = m;
SUPPORTED = (method != null);
}
/**
* Create a new ZLib compatible output stream wrapping the given low level
* stream. ZLib compatiblity means we will send a zlib header.
*
* @param os
* OutputStream The underlying stream.
* @throws IOException
* In case of a lowlevel transfer problem.
* @throws NoSuchAlgorithmException
* In case of a {@link Deflater} error.
*/
public ZLibOutputStream(OutputStream os) throws IOException,
NoSuchAlgorithmException {
super(os, new Deflater(Deflater.BEST_COMPRESSION));
}
/**
* Flush the given stream, preferring Java7 FLUSH_SYNC if available.
*
* @throws IOException
* In case of a lowlevel exception.
*/
@Override
public void flush() throws IOException {
if (!SUPPORTED) {
super.flush();
return;
}
try {
int count = 0;
do {
count = (Integer) method.invoke(def, buf, 0, buf.length, 3);
if (count > 0) {
out.write(buf, 0, count);
}
} while (count > 0);
} catch (IllegalArgumentException e) {
throw new IOException("Can't flush");
} catch (IllegalAccessException e) {
throw new IOException("Can't flush");
} catch (InvocationTargetException e) {
throw new IOException("Can't flush");
}
super.flush();
}
}

View file

@ -50,8 +50,6 @@ import eu.siacs.conversations.crypto.sasl.ScramSha1;
import eu.siacs.conversations.entities.Account;
import eu.siacs.conversations.services.XmppConnectionService;
import eu.siacs.conversations.utils.DNSHelper;
import eu.siacs.conversations.utils.zlib.ZLibInputStream;
import eu.siacs.conversations.utils.zlib.ZLibOutputStream;
import eu.siacs.conversations.xml.Element;
import eu.siacs.conversations.xml.Tag;
import eu.siacs.conversations.xml.TagWriter;
@ -92,7 +90,6 @@ public class XmppConnection implements Runnable {
private int smVersion = 3;
private SparseArray<String> messageReceipts = new SparseArray<>();
private boolean enabledCompression = false;
private boolean enabledEncryption = false;
private boolean enabledCarbons = false;
@ -144,7 +141,6 @@ public class XmppConnection implements Runnable {
protected void connect() {
Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": connecting");
enabledCompression = false;
enabledEncryption = false;
lastConnect = SystemClock.elapsedRealtime();
lastPingSent = SystemClock.elapsedRealtime();
@ -261,8 +257,6 @@ public class XmppConnection implements Runnable {
processStreamFeatures(nextTag);
} else if (nextTag.isStart("proceed")) {
switchOverToTls(nextTag);
} else if (nextTag.isStart("compressed")) {
switchOverToZLib(nextTag);
} else if (nextTag.isStart("success")) {
final String challenge = tagReader.readElement(nextTag).getContent();
try {
@ -498,28 +492,6 @@ public class XmppConnection implements Runnable {
}
}
private void sendCompressionZlib() throws IOException {
Element compress = new Element("compress");
compress.setAttribute("xmlns", "http://jabber.org/protocol/compress");
compress.addChild("method").setContent("zlib");
tagWriter.writeElement(compress);
}
private void switchOverToZLib(final Tag currentTag)
throws XmlPullParserException, IOException,
NoSuchAlgorithmException {
tagReader.readTag(); // read tag close
tagWriter.setOutputStream(new ZLibOutputStream(tagWriter
.getOutputStream()));
tagReader
.setInputStream(new ZLibInputStream(tagReader.getInputStream()));
sendStartStream();
Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": compression enabled");
enabledCompression = true;
processStream(tagReader.readTag());
}
private void sendStartTLS() throws IOException {
Tag startTLS = Tag.empty("starttls");
startTLS.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-tls");
@ -601,8 +573,6 @@ public class XmppConnection implements Runnable {
this.streamFeatures = tagReader.readElement(currentTag);
if (this.streamFeatures.hasChild("starttls") && !enabledEncryption) {
sendStartTLS();
} else if (compressionAvailable()) {
sendCompressionZlib();
} else if (this.streamFeatures.hasChild("register")
&& account.isOptionSet(Account.OPTION_REGISTER)
&& enabledEncryption) {
@ -658,28 +628,6 @@ public class XmppConnection implements Runnable {
}
}
private boolean compressionAvailable() {
if (!this.streamFeatures.hasChild("compression",
"http://jabber.org/features/compress"))
return false;
if (!ZLibOutputStream.SUPPORTED)
return false;
if (!account.isOptionSet(Account.OPTION_USECOMPRESSION))
return false;
Element compression = this.streamFeatures.findChild("compression",
"http://jabber.org/features/compress");
for (Element child : compression.getChildren()) {
if (!"method".equals(child.getName()))
continue;
if ("zlib".equalsIgnoreCase(child.getContent())) {
return true;
}
}
return false;
}
private List<String> extractMechanisms(Element stream) {
ArrayList<String> mechanisms = new ArrayList<>(stream
.getChildren().size());
@ -1147,9 +1095,5 @@ public class XmppConnection implements Runnable {
return connection
.findDiscoItemByFeature("http://jabber.org/protocol/bytestreams") != null;
}
public boolean compression() {
return connection.enabledCompression;
}
}
}