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/*
* 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.tomcat.spdy;
import java.io.IOException;
import java.util.zip.DataFormatException;
import java.util.zip.Deflater;
import java.util.zip.Inflater;
import org.apache.tomcat.spdy.SpdyConnection.CompressSupport;
/**
* Java6 Deflater with the workaround from tomcat http filters.
*/
class CompressDeflater6 implements CompressSupport {
public static final long DICT_ID = 3751956914L;
// Make sure to use the latest from net/spdy/spdy_framer.cc, not from spec
private static final String SPDY_DICT_S =
"optionsgetheadpostputdeletetraceacceptaccept-charsetaccept-encodingaccept-"
+ "languageauthorizationexpectfromhostif-modified-sinceif-matchif-none-matchi"
+ "f-rangeif-unmodifiedsincemax-forwardsproxy-authorizationrangerefererteuser"
+ "-agent10010120020120220320420520630030130230330430530630740040140240340440"
+ "5406407408409410411412413414415416417500501502503504505accept-rangesageeta"
+ "glocationproxy-authenticatepublicretry-afterservervarywarningwww-authentic"
+ "ateallowcontent-basecontent-encodingcache-controlconnectiondatetrailertran"
+ "sfer-encodingupgradeviawarningcontent-languagecontent-lengthcontent-locati"
+ "oncontent-md5content-rangecontent-typeetagexpireslast-modifiedset-cookieMo"
+ "ndayTuesdayWednesdayThursdayFridaySaturdaySundayJanFebMarAprMayJunJulAugSe"
+ "pOctNovDecchunkedtext/htmlimage/pngimage/jpgimage/gifapplication/xmlapplic"
+ "ation/xhtmltext/plainpublicmax-agecharset=iso-8859-1utf-8gzipdeflateHTTP/1"
+ ".1statusversionurl ";
private static final byte[] SPDY_DICT = SPDY_DICT_S.getBytes();
// C code uses this - not in the spec
static {
SPDY_DICT[SPDY_DICT.length - 1] = (byte) 0;
}
private Deflater zipOut;
private Inflater zipIn;
private byte[] decompressBuffer;
private int decMax;
private byte[] compressBuffer;
public CompressDeflater6() {
}
public static CompressDeflater6 get() {
// TODO: code to plug in v7-specific. It is marginally faster.
return new CompressDeflater6();
}
public void recycle() {
// TODO
}
public void init() {
if (zipOut != null) {
return;
}
try {
// false is important - otherwise 'bad method'
zipOut = new Deflater(Deflater.DEFAULT_COMPRESSION, false);
zipOut.setDictionary(SPDY_DICT);
zipIn = new Inflater();
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public synchronized void compress(SpdyFrame frame, int start)
throws IOException {
init();
if (compressBuffer == null) {
compressBuffer = new byte[frame.data.length];
}
// last byte for flush ?
zipOut.setInput(frame.data, start, frame.endData - start - 1);
int coff = start;
zipOut.setLevel(Deflater.DEFAULT_COMPRESSION);
while (true) {
int rd = zipOut.deflate(compressBuffer, coff, compressBuffer.length - coff);
if (rd == 0) {
// needsInput needs to be called - we're done with this frame ?
zipOut.setInput(frame.data, frame.endData - 1, 1);
zipOut.setLevel(Deflater.BEST_SPEED);
while (true) {
rd = zipOut.deflate(compressBuffer, coff, compressBuffer.length - coff);
coff += rd;
if (rd == 0) {
break;
}
byte[] b = new byte[compressBuffer.length * 2];
System.arraycopy(compressBuffer, 0, b, 0, coff);
compressBuffer = b;
}
zipOut.setLevel(Deflater.DEFAULT_COMPRESSION);
break;
}
coff += rd;
}
byte[] tmp = frame.data;
frame.data = compressBuffer;
compressBuffer = tmp;
frame.endData = coff;
}
@Override
public synchronized void decompress(SpdyFrame frame, int start)
throws IOException {
// stream id ( 4 ) + unused ( 2 )
// nvCount is compressed in impl - spec is different
init();
if (decompressBuffer == null) {
decompressBuffer = new byte[frame.data.length];
}
// will read from dec buffer to frame.data
decMax = frame.endData;
int off = start;
zipIn.setInput(frame.data, start, decMax - start);
while (true) {
int rd;
try {
rd = zipIn.inflate(decompressBuffer, off, decompressBuffer.length - off);
if (rd == 0 && zipIn.needsDictionary()) {
zipIn.setDictionary(SPDY_DICT);
continue;
}
} catch (DataFormatException e) {
throw new IOException(e);
}
if (rd == 0) {
break;
}
if (rd == -1) {
break;
}
off += rd;
byte[] b = new byte[decompressBuffer.length * 2];
System.arraycopy(decompressBuffer, 0, b, 0, off);
decompressBuffer = b;
}
byte[] tmpBuf = decompressBuffer;
decompressBuffer = frame.data;
frame.data = tmpBuf;
frame.off = start;
frame.endData = off;
}
}
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