Added Unzipper class for PDFAS configuration extraction

git-svn-id: https://svn.iaik.tugraz.at/svn/egiz/prj/current/12PDF-OVER-4.0@12546 3a0b52a2-8410-0410-bc02-ff6273a87459

1 files changed, 80 insertions, 0 deletions

diff --git a/trunk/pdf-over-gui/src/main/java/at/asit/pdfover/gui/Unzipper.java b/trunk/pdf-over-gui/src/main/java/at/asit/pdfover/gui/Unzipper.java
new file mode 100644
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+++ b/trunk/pdf-over-gui/src/main/java/at/asit/pdfover/gui/Unzipper.java
@@ -0,0 +1,80 @@
+/*
+ * Copyright 2012 by A-SIT, Secure Information Technology Center Austria
+ *
+ * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
+ * the European Commission - subsequent versions of the EUPL (the "Licence");
+ * You may not use this work except in compliance with the Licence.
+ * You may obtain a copy of the Licence at:
+ * http://joinup.ec.europa.eu/software/page/eupl
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the Licence is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the Licence for the specific language governing permissions and
+ * limitations under the Licence.
+ */
+package at.asit.pdfover.gui;
+
+// Imports
+import java.io.BufferedOutputStream;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.URL;
+import java.util.Enumeration;
+import java.util.zip.GZIPInputStream;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipFile;
+import java.util.zip.ZipInputStream;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * 
+ */
+public class Unzipper {
+	/**
+	 * SLF4J Logger instance
+	 **/
+	private static final Logger log = LoggerFactory.getLogger(Unzipper.class);
+
+	/**
+	 * Extracts Zip File input stream to target path 
+	 * @param is
+	 * @param targetPath
+	 * @throws IOException
+	 */
+	public static void unzip(InputStream is, String targetPath) throws IOException {
+		ZipInputStream zis = new ZipInputStream(is);
+		ZipEntry entry;
+		// while there are entries I process them
+		while ((entry = zis.getNextEntry()) != null) {
+			log.debug("entry: " + entry.getName() + ", "  //$NON-NLS-1$//$NON-NLS-2$
+					+ entry.getSize());
+			// consume all the data from this entry
+
+			if (entry.isDirectory()) {
+				log.debug("Extracting directory: " + entry.getName()); //$NON-NLS-1$
+				// This is not robust, just for demonstration purposes.
+				File nDir =new File(targetPath + "/" + entry.getName()); //$NON-NLS-1$
+				if(!nDir.exists()) {
+					if(!nDir.mkdir()) {
+						throw new IOException("Failed to create dir: " + entry.getName()); //$NON-NLS-1$
+					}
+				}
+				continue;
+			}
+			byte[] buffer = new byte[1024];
+			int len;
+			BufferedOutputStream out = new BufferedOutputStream(
+					new FileOutputStream(targetPath + "/" + entry.getName())); //$NON-NLS-1$
+			while ((len = zis.read(buffer)) >= 0)
+				out.write(buffer, 0, len);
+			
+			out.close();
+		}
+	}
+}