问题描述

这是修补的类，有点像每晚构建的，需要对其进行测试。该JGZipOutputStream班可以在这里找到： 创建使用jzlib gzip文件

可以在http://www.jcraft.com/jzlib/中找到JZlib

您可以通过在引导程序路径（-Xbootclasspath/a:）中添加一个小jar 或对tomcat本身进行解压缩/ jar进行修补。

额外的好处是java impl。实际上比本地代码快。

/*
 *  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.coyote.http11.filters;

import java.io.IOException;
import java.io.OutputStream;
import java.util.zip.GZIPOutputStream;

import org.apache.coyote.OutputBuffer;
import org.apache.coyote.Response;
import org.apache.coyote.http11.OutputFilter;
import org.apache.tomcat.util.buf.ByteChunk;

import bestsss.util.JGZipOutputStream;

import com.jcraft.jzlib.JZlib;

/**
 * Gzip output filter.
 * 
 * @author Remy Maucherat
 */
public class GzipOutputFilter implements OutputFilter {


    /**
     * Logger.
     */
    protected static org.apache.juli.logging.Log log =
        org.apache.juli.logging.LogFactory.getLog(GzipOutputFilter.class);


    // ----------------------------------------------------- Instance Variables


    /**
     * Next buffer in the pipeline.
     */
    protected OutputBuffer buffer;


    /**
     * Compression output stream.
     */
    protected OutputStream compressionStream = null;


    /**
     * Fake internal output stream.
     */
    protected OutputStream fakeOutputStream = new FakeOutputStream();


    // --------------------------------------------------- OutputBuffer Methods


    /**
     * Write some bytes.
     * 
     * @return number of bytes written by the filter
     */
    @Override
    public int doWrite(ByteChunk chunk, Response res)
        throws IOException {
        if (compressionStream == null) {
            compressionStream = new JGZipOutputStream(fakeOutputStream, new byte[Math.min(32768, Math.max(2048, Integer.highestOneBit(chunk.getLength()-1)<<1))]);
        }
        compressionStream.write(chunk.getBytes(), chunk.getStart(), 
                                chunk.getLength());
        return chunk.getLength();
    }


    @Override
    public long getBytesWritten() {
        return buffer.getBytesWritten();
    }


    // --------------------------------------------------- OutputFilter Methods

    /**
     * Added to allow flushing to happen for the gzip'ed outputstream
     */
    public void flush() {
        if (compressionStream != null) {
            try {
                if (log.isDebugEnabled()) {
                    log.debug("Flushing the compression stream!");
                }
                compressionStream.flush();
            } catch (IOException e) {
                if (log.isDebugEnabled()) {
                    log.debug("Ignored exception while flushing gzip filter", e);
                }
            }
        }
    }

    /**
     * Some filters need additional parameters from the response. All the 
     * necessary reading can occur in that method, as this method is called
     * after the response header processing is complete.
     */
    @Override
    public void setResponse(Response response) {
        // NOOP: No need for parameters from response in this filter
    }


    /**
     * Set the next buffer in the filter pipeline.
     */
    @Override
    public void setBuffer(OutputBuffer buffer) {
        this.buffer = buffer;
    }


    /**
     * End the current request. It is acceptable to write extra bytes using
     * buffer.doWrite during the execution of this method.
     */
    @Override
    public long end()
        throws IOException {
        if (compressionStream == null) {
            compressionStream = new JGZipOutputStream(fakeOutputStream, new byte[128]);
        }        
        compressionStream.close();
        return ((OutputFilter) buffer).end();
    }


    /**
     * Make the filter ready to process the next request.
     */
    @Override
    public void recycle() {
        // Set compression stream to null
        compressionStream = null;
    }


    // ------------------------------------------- FakeOutputStream Inner Class


    protected class FakeOutputStream
        extends OutputStream {
        protected ByteChunk outputChunk = new ByteChunk();
        protected byte[] singleByteBuffer = new byte[1];
        @Override
        public void write(int b)
            throws IOException {
            // Shouldn't get used for good performance, but is needed for 
            // compatibility with Sun JDK 1.4.0
            singleByteBuffer[0] = (byte) (b & 0xff);
            outputChunk.setBytes(singleByteBuffer, 0, 1);
            buffer.doWrite(outputChunk, null);
        }
        @Override
        public void write(byte[] b, int off, int len)
            throws IOException {
            outputChunk.setBytes(b, off, len);
            buffer.doWrite(outputChunk, null);
        }
        @Override
        public void flush() throws IOException {/*NOOP*/}
        @Override
        public void close() throws IOException {/*NOOP*/}
    }


}

解决方法

 SIGSEGV (0xb) at pc=0xb6a72295,pid=19470,tid=241171312

 JRE version: 6.0_29-b11  Java VM: Java HotSpot(TM) Server VM (20.4-b02 mixed mode linux-x86 )

 Problematic frame:  C  [libzip.so+0x5295]  double+0x45

 If you would like to submit a bug report,please visit:    http://java.sun.com/webapps/bugreport/crash.jsp  The crash happened outside the Java Virtual Machine in native code.  See problematic frame for where to report the bug.


---------------  T H R E A D  ---------------

Current thread (0x1044dc00):  JavaThread "catalina-exec-177" daemon [_thread_in_native,id=21423,stack(0x0e5af000,0x0e600000)]

siginfo:si_signo=SIGSEGV: si_errno=0,si_code=2 (SEGV_ACCERR),si_addr=0x10dfc000

Registers: EAX=0x10d00018,EBX=0xb6a7dabc,ECX=0x000fbfe6,EDX=0x00000000 ESP=0x0e5febf0,EBP=0x0e5fec18,ESI=0x0eadc098,EDI=0x10458800 EIP=0xb6a72295,EFLAGS=0x00010246,CR2=0x10dfc000

Top of Stack: (sp=0x0e5febf0) 0x0e5febf0:   b7869118 00000000 0ef2e648 b6a71216 0x0e5fec00:   13d1f690 10c492b0 0000bfe1 b6a7dabc 0x0e5fec10: 10458800 0ef2e648 0e5fec48 b6a7134d 0x0e5fec20:   10458800 00000004 0e5fec48 b77b727c 0x0e5fec30:   00000007 3d4af570 ffffffff b6a7dabc 0x0e5fec40:   31fe9ad0 1044dd20 0e5feca8 b6a6f585 0x0e5fec50:   0ef2e648 00000004 00000002 00000000 0x0e5fec60:   10b59810 3d5cff58 00000002 00004114

Instructions: (pc=0xb6a72295) 0xb6a72275:   05 01 00 00 0f 86 79 03 00 00 83 fa 02 76 41 8b 0xb6a72285:   57 40 8b 4f 50 8b 47 30 8b 77 38 d3 e2 8b 4f 64 0xb6a72295:   0f b6 44 01 02 31 c2 8b 47 4c 21 c2 8b 47 2c 89 0xb6a722a5:   57 40 21 c1 8b 47 3c 0f b7 04 50 89 45 f0 66 89

Register to memory mapping:

EAX=0x10d00018 is an unknown value EBX=0xb6a7dabc: <offset 0x10abc> in /usr/local/jdk1.6.0_29/jre/lib/i386/libzip.so at 0xb6a6d000 ECX=0x000fbfe6 is an unknown value EDX=0x00000000 is an unknown value ESP=0x0e5febf0 is pointing into the stack for thread: 0x1044dc00 EBP=0x0e5fec18 is pointing into the stack for thread: 0x1044dc00 ESI=0x0eadc098 is an unknown value EDI=0x10458800 is an unknown value


Stack: [0x0e5af000,0x0e600000],sp=0x0e5febf0,free space=318k Native frames: (J=compiled Java code,j=interpreted,Vv=VM code,C=native code) C  [libzip.so+0x5295]  double+0x45 C  [libzip.so+0x434d]  double+0x10d C  [libzip.so+0x2585]  Java_java_util_zip_Deflater_deflateBytes+0x355 J  java.util.zip.Deflater.deflateBytes(J[BII)I

Java frames: (J=compiled Java code,Vv=VM code) J  java.util.zip.Deflater.deflateBytes(J[BII)I J  java.util.zip.GZIPOutputStream.finish()V J  org.apache.coyote.http11.Http11NioProcessor.actionInternal(Lorg/apache/coyote/ActionCode;Ljava/lang/Object;)V J  org.apache.coyote.http11.AbstractHttp11Processor.action(Lorg/apache/coyote/ActionCode;Ljava/lang/Object;)V J  org.apache.catalina.connector.Response.finishResponse()V J  org.apache.catalina.connector.CoyoteAdapter.service(Lorg/apache/coyote/Request;Lorg/apache/coyote/Response;)V J  org.apache.coyote.http11.Http11NioProcessor.process(Lorg/apache/tomcat/util/net/NioChannel;)Lorg/apache/tomcat/util/net/AbstractEndpoint$Handler$SocketState; J  org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run()V J  java.util.concurrent.ThreadPoolExecutor$Worker.run()V j  java.lang.Thread.run()V+11 v  ~StubRoutines::call_stub