Dépôt officiel du code source de l'ERP OpenConcerto

/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

 *

 * Copyright 2011 OpenConcerto, by ILM Informatique. All rights reserved.

 *

 * The contents of this file are subject to the terms of the GNU General Public License Version 3

 * only ("GPL"). You may not use this file except in compliance with the License. You can obtain a

 * copy of the License at http://www.gnu.org/licenses/gpl-3.0.html See the License for the specific

 * language governing permissions and limitations under the License.

 *

 * When distributing the software, include this License Header Notice in each file.

 */

 package org.openconcerto.utils;

import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.nio.ByteBuffer;

import java.util.Enumeration;

import java.util.Set;

import java.util.zip.CRC32;

import java.util.zip.DeflaterOutputStream;

import java.util.zip.InflaterInputStream;

import java.util.zip.ZipEntry;

import java.util.zip.ZipException;

import java.util.zip.ZipOutputStream;

/**

 * Permet d'écrire dans un fichier zip.

 *

 * @author ILM Informatique

 * @see org.openconcerto.utils.Unzip

 */

public class Zip {

    static public byte[] deflate(final String s) throws IOException {

        return deflate(s.getBytes(StringUtils.UTF8));

    }

    static public byte[] deflate(final byte[] b) throws IOException {

        final ByteArrayOutputStream bOut = new ByteArrayOutputStream();

        final DeflaterOutputStream out = new DeflaterOutputStream(bOut);

        out.write(b);

        out.close();

        return bOut.toByteArray();

    }

    static public ByteBuffer deflateToBuffer(final String s) throws IOException {

        return ByteBuffer.wrap(deflate(s));

    }

    static public String inflateToString(final ByteBuffer payload) throws IOException {

        return inflateToString(payload, payload.remaining());

    }

    static public String inflateToString(final ByteBuffer payload, final int length) throws IOException {

        final byte[] b = new byte[length];

        payload.get(b);

        return inflateToString(b);

    }

    static public String inflateToString(final byte[] b) throws IOException {

        return new String(inflate(b), StringUtils.UTF8);

    }

    static public byte[] inflate(final byte[] b) throws IOException {

        final InflaterInputStream in = new InflaterInputStream(new ByteArrayInputStream(b));

        final ByteArrayOutputStream out = new ByteArrayOutputStream();

        StreamUtils.copy(in, out);

        out.close();

        return out.toByteArray();

    }

    /**

     * Copie de from dans to seulement les entrées dont le nom n'est pas dans

     * <code>excludedEntries</code>.

     *

     * @param from le zip source.

     * @param excludedEntries les noms des entrées à exclure.

     * @param to le zip de destination, s'il existe déjà les entrées de from seront ajoutées aux

     *        existantes.

     * @return le fichier zip dest.

     * @throws ZipException

     * @throws IOException

     */

    static public Zip createFrom(File from, File to, Set<String> excludedEntries) throws ZipException, IOException {

        Unzip unz = new Unzip(from);

        Zip res = new Zip(to);

        final Enumeration<? extends ZipEntry> en = unz.entries();

        while (en.hasMoreElements()) {

            final ZipEntry entry = en.nextElement();

            if (!excludedEntries.contains(entry.getName())) {

                res.zip(entry.getName(), unz.getInputStream(entry));

            }

        }

        unz.close();

        return res;

    }

    /**

     * Efface les entrées spécifées de src. Si dest existe, il sera ecrasé.

     *

     * @param src le zip source.

     * @param entriesName les noms des entrées à effacer.

     * @param dest le zip de destination.

     * @throws ZipException

     * @throws IOException

     */

    static public void delete(File src, Set<String> entriesName, File dest) throws ZipException, IOException {

        if (dest.exists())

            dest.delete();

        createFrom(src, dest, entriesName).close();

    }

    // *** Instance

    private final OutputStream outstream;

    private ZipOutputStream zos;

    // is an entry open, ie addEntry() has been called but closeEntry() not yet

    private boolean entryOpen;

    /**

     * Construit un fichier zip. ATTN Le fichier passé sera écrasé lors de la première écriture.

     *

     * @param f le fichier dans lequel sauver, peut ne pas exister.

     * @throws FileNotFoundException if f cannot be written to.

     */

    public Zip(File f) throws FileNotFoundException {

        this(new FileOutputStream(f));

    }

    /**

     * Construit un fichier zip.

     *

     * @param out un stream dans lequel écrire.

     */

    public Zip(OutputStream out) {

        this.outstream = out;

        this.zos = null;

        this.entryOpen = false;

    }

    public synchronized void close() throws IOException {

        if (this.zos != null) {

            // ferme aussi le FileOutputStream

            this.zos.close();

        }

    }

    // *** Ecriture

    private synchronized ZipOutputStream getOutStream() {

        if (this.zos == null) {

            this.zos = new ZipOutputStream(this.outstream);

        }

        return this.zos;

    }

    /**

     * Ajoute newFile dans ce fichier. Il sera enregistré dans le zip directement à la racine.

     *

     * @param newFile le fichier à ajouter.

     * @throws IOException si le fichier ne peut etre zippé.

     */

    public void zip(File newFile) throws IOException {

        // on ne garde que la derniere partie du chemin

        this.zip(newFile.getName(), new BufferedInputStream(new FileInputStream(newFile)));

    }

    /**

     * Zippe le contenu de <code>in</code>.

     *

     * @param name le nom de l'entrée.

     * @param in l'ajout.

     * @throws IOException si in ne peut etre zippé.

     */

    public synchronized void zip(String name, InputStream in) throws IOException {

        this.putNextEntry(name);

        byte b[] = new byte[512];

        int len = 0;

        while ((len = in.read(b)) != -1) {

            this.getOutStream().write(b, 0, len);

        }

        this.closeEntry();

    }

    public void zip(String name, byte[] in, final boolean compressed) throws IOException {

        // don't make #zip(String, InputStream) call this method, it would require to read the

        // entire stream into memory

        if (compressed)

            this.zip(name, new ByteArrayInputStream(in));

        else

            this.zipNonCompressed(name, in);

    }

    /**

     * Zip the passed array with the {@link ZipEntry#STORED} method. This method takes care of the

     * CRC and size.

     *

     * @param name the entry name.

     * @param in what to zip.

     * @throws IOException if an error occurs.

     */

    public synchronized void zipNonCompressed(String name, byte[] in) throws IOException {

        final ZipEntry entry = new ZipEntry(name);

        entry.setMethod(ZipEntry.STORED);

        final CRC32 crc = new CRC32();

        crc.update(in);

        entry.setCrc(crc.getValue());

        entry.setSize(in.length);

        this.putNextEntry(entry);

        this.getOutStream().write(in);

        this.closeEntry();

    }

    /**

     * Adds a new entry to this zip file. ATTN you must close the returned stream before you can add

     * to this zip again.

     *

     * @param name the name of the entry.

     * @return a stream to write to the entry.

     * @throws IOException if a pb occurs.

     */

    public synchronized OutputStream createEntry(String name) throws IOException {

        this.putNextEntry(name);

        return new BufferedOutputStream(this.getOutStream()) {

            public void close() throws IOException {

                this.flush();

                Zip.this.closeEntry();

            }

        };

    }

    private final synchronized void putNextEntry(String name) throws IOException, FileNotFoundException {

        this.putNextEntry(new ZipEntry(name));

    }

    private final synchronized void putNextEntry(ZipEntry entry) throws IOException, FileNotFoundException {

        if (this.entryOpen)

            throw new IllegalStateException("previous entry not closed");

        this.entryOpen = true;

        this.getOutStream().putNextEntry(entry);

    }

    protected final synchronized void closeEntry() throws IOException {

        this.getOutStream().closeEntry();

        this.entryOpen = false;

    }

}