utility to dump POIFS into filesystem

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@690259 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/poi/poifs/dev/POIFSDump.java

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+/* ====================================================================
+   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.poi.poifs.dev;
+
+import org.apache.poi.poifs.filesystem.*;
+
+import java.io.FileInputStream;
+import java.io.File;
+import java.io.IOException;
+import java.io.FileOutputStream;
+import java.util.Iterator;
+
+/**
+ *
+ * Dump internal structure of a OLE2 file into file system
+ *
+ * @author Yegor Kozlov
+ */
+public class POIFSDump {
+
+    public static void main(String[] args) throws Exception {
+        for (int i = 0; i < args.length; i++) {
+            System.out.println("Dumping " + args[i]);
+            FileInputStream is = new FileInputStream(args[i]);
+            POIFSFileSystem fs = new POIFSFileSystem(is);
+            is.close();
+
+            DirectoryEntry root = fs.getRoot();
+            File file = new File(root.getName());
+            file.mkdir();
+
+            dump(root, file);
+        }
+   }
+
+
+    public static void dump(DirectoryEntry root, File parent) throws IOException {
+        for(Iterator it = root.getEntries(); it.hasNext();){
+            Entry entry = (Entry)it.next();
+            if(entry instanceof DocumentNode){
+                DocumentNode node = (DocumentNode)entry;
+                DocumentInputStream is = new DocumentInputStream(node);
+                byte[] bytes = new byte[node.getSize()];
+                is.read(bytes);
+                is.close();
+
+                FileOutputStream out = new FileOutputStream(new File(parent, node.getName().trim()));
+                out.write(bytes);
+                out.close();
+            } else if (entry instanceof DirectoryEntry){
+                DirectoryEntry dir = (DirectoryEntry)entry;
+                File file = new File(parent, entry.getName());
+                file.mkdir();
+                dump(dir, file);
+            } else {
+                System.err.println("Skipping unsupported POIFS entry: " + entry);
+            }
+        }
+    }
+}