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ZipTool.java

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package net.threebit.utils.sosc;

/*
        Copyright 2003 Shawn Deleurme
        Copyright 2003 Kevin O'Donnell

        This program is free software; you can redistribute it and/or modify
        it under the terms of the GNU General Public License as published by
        the Free Software Foundation; either version 2 of the License, or
        (at your option) any later version.

        This program is distributed in the hope that it will be useful,
        but WITHOUT ANY WARRANTY; without even the implied warranty of
        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        GNU General Public License for more details.

        You should have received a copy of the GNU General Public License
        along with this program; if not, write to the Free Software
        Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

import javax.xml.transform.*;
import javax.xml.transform.stream.*;
import java.sql.*;
import java.io.*;
import java.util.*;
import java.util.zip.*;
import java.util.logging.*;
import javax.servlet.http.*;
import javax.servlet.jsp.*;
import java.util.logging.*;

public class ZipTool {

        Logger logger = Logger.getLogger("net.threebit.utils.sosc");

        private ZipOutputStream zout;

        private CRC32 crc = new CRC32();

        private byte[] buffer = new byte[250 * 1024];

        private PipedOutputStream pipedOutputStream = new PipedOutputStream();

        private PipedInputStream pipedInputStream = null;

        private int compressionLevel = Deflater.NO_COMPRESSION;

        public ZipTool (int compressionLevel) throws IOException {
                this.compressionLevel = compressionLevel;
                pipedInputStream = new PipedInputStream(pipedOutputStream);
                zout = new ZipOutputStream(pipedOutputStream);
                zout.setLevel(compressionLevel);
        }

        public InputStream getInputStream() {
                return pipedInputStream;
        }

        public void close() throws IOException {
                zout.close();
        }

        public void addFile (InputStream fis1, String path) throws IOException {

                // make sure that only one file is added at a time.
                synchronized (zout) {

                        // the size of the file.
                        long size = 0;

                        // for buffer operations.
                        int len;

                        // the zip entry; contains CRC, name and size information.
                        ZipEntry entry;

                        // used to query information about the file
                        OutputStreamCounter counter = new OutputStreamCounter();

                        // need to calculate "counter", so we need to use a Deflater.
                        Deflater deflater = new Deflater(compressionLevel, true);

                        // need to calculate "counter", so we need to use a DeflaterOutputStream.
                        DeflaterOutputStream dout = new DeflaterOutputStream(counter, deflater);

                        // this is a temporary file that will be re-read the second time an input stream is needed.
                        File tempFile = File.createTempFile("ZipToolTempFile","zip");
                        FileOutputStream fout = new FileOutputStream(tempFile);

                        // calculate size, crc and counter
                        crc.reset();
                        while ((len = fis1.read(buffer)) >= 0)
                        {
                                size += len;
                                crc.update(buffer, 0, len);
                                dout.write(buffer, 0, len);
                                fout.write(buffer, 0, len);
                        }
                        fis1.close();
                        dout.close();
                        fout.close();

                        // create a new Zip entry.
                        entry = new ZipEntry(path);
                        entry.setSize(size);
                        entry.setCompressedSize(counter.getSize());
                        entry.setCrc(crc.getValue());

                        // re-read the file and write out the contents
                        FileInputStream fis2 = new FileInputStream(tempFile);
                        zout.putNextEntry(entry);
                        int size2 = 0;
                        while ((len = fis2.read(buffer)) >= 0) {
                                size2 += len;
                                zout.write(buffer, 0, len);
                        }
                        fis2.close();
                        zout.closeEntry();

                        tempFile.delete();
                        if (size != size2) { throw new RuntimeException("Assertion failure; size: " + size + " size2: " + size2); }
                }
        }

        static class OutputStreamCounter extends OutputStream
        {
                long count;

                public void write(int b)
                {
                        count++;
                }

                public void write(byte[] buffer)
                {
                        count += buffer.length;
                }

                public void write(byte[] buffer, int offset, int length)
                {
                        count += length;
                }

                public long getSize()
                {
                        return count;
                }
        }

}

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