/*
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fm - File management class library
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Copyright (C) 2024 Ulrich Hilger
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package de.uhilger.fm;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.util.zip.Adler32;
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import java.util.zip.CheckedOutputStream;
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import java.util.zip.ZipEntry;
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import java.util.zip.ZipOutputStream;
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/**
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* Packen von Dateien
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*
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* @author Ulrich Hilger, 15. Januar 2024
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*/
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public class Deflator {
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/**
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* Einen Ordner packen.
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*
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* Als Ziel wird eine neue Datei mit Dateiendung '.zip' erzeugt, die so heisst wie der Ordner, der
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* gepackt werden soll. Die Datei mit dem gepackten Ordnerinhalt wird in dem Ordner angelegt, der
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* den zu packenden Ordner enthaelt.
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*
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* @param fName Name des zu packenden Ordners
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* @param relPath relativer Pfad zum Ordner, der gepackt werden soll
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* @return die Meldung mit dem Ergebnis. Wenn die Meldung nicht "ok" lautet wurde die ZIP-Datei
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* nicht erzeugt und die Meldung nennt den Grund.
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*/
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public String packFolder(String fName, String relPath, String base/*, HttpExchange e*/) {
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if (!relPath.startsWith(".")) {
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try {
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//String fName = getFileName(e);
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//logger.fine("fName: " + fName);
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if (fName.endsWith("/")) {
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File dir = new File(base, fName);
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if (dir.isDirectory()) {
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//logger.fine("absPath: " + dir.getAbsolutePath());
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File parentDir = dir.getParentFile();
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StringBuilder fname = new StringBuilder();
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fname.append(dir.getName());
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fname.append(".zip");
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File archiveFile = new File(parentDir, fname.toString());
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pack(dir.getAbsolutePath(), archiveFile.getAbsolutePath());
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return "ok";
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} else {
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return "kein Ordner";
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}
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} else {
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return "kein Ordner";
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}
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} catch (Exception ex) {
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String result = ex.getLocalizedMessage();
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//logger.log(Level.SEVERE, result, ex);
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return result;
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}
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} else {
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return "Falsche relative Pfadangabe";
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}
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}
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/**
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* pack the contents of a given folder into a new ZIP compressed archive
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*
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* @param folder absolute path and name of the folder to pack
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* @param archive absolute path and name of the archive to create from the given files
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* @throws Exception
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*/
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private boolean pack(String folder, String archive) throws Exception {
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File file = new File(archive);
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FileOutputStream fos = new FileOutputStream(file);
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CheckedOutputStream checksum = new CheckedOutputStream(fos, new Adler32());
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ZipOutputStream zos = new ZipOutputStream(checksum);
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pack(zos, folder, "");
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zos.flush();
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zos.finish();
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zos.close();
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fos.flush();
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fos.close();
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return true;
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}
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/**
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* go through the given file structure recursively
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*
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* @param zipFile the ZIP file to write to
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* @param srcDir the directory to pack during this cycle
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* @param subDir the subdirectory to append to names of file entries inside the archive
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* @throws IOException
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*/
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private void pack(ZipOutputStream zipFile, String srcDir, String subDir) throws IOException {
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File[] files = new File(srcDir).listFiles();
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for (int i = 0; i < files.length; i++) {
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if (files[i].isDirectory()) {
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pack(zipFile, files[i].getAbsolutePath(), subDir + File.separator + files[i].getName());
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} else {
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packFile(zipFile, subDir, files[i]);
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}
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}
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}
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/**
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* pack a given file
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*
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* @param zipFile the ZIP archive to pack to
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* @param dir the directory name to append to name of file entry inside archive
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* @param file the file to pack
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* @throws IOException
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*/
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private void packFile(ZipOutputStream zipFile, String dir, File file) throws IOException {
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FileInputStream fileinputstream = new FileInputStream(file);
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byte buf[] = new byte[fileinputstream.available()];
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fileinputstream.read(buf);
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String dirWithSlashes = dir.replace('\\', '/');
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//System.out.println("zipping " + dirWithSlashes + "/" + file.getName());
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ZipEntry ze = new ZipEntry(dirWithSlashes + "/" + file.getName());
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ze.setMethod(ZipEntry.DEFLATED);
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zipFile.putNextEntry(ze);
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zipFile.write(buf, 0, buf.length);
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zipFile.closeEntry();
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fileinputstream.close();
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}
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}
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