Fix bug #45437 - Detect encrypted word documents, and throw an EncryptedDocumentException instead of a OOM

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@678539 13f79535-47bb-0310-9956-ffa450edef68

src/documentation/content/xdocs/changes.xml

@@ -37,6 +37,7 @@
 
 		<!-- Don't forget to update status.xml too! -->
         <release version="3.1.1-alpha1" date="2008-??-??">
+           <action dev="POI-DEVELOPERS" type="fix">45437 - Detect encrypted word documents, and throw an EncryptedDocumentException instead of a OOM</action>
            <action dev="POI-DEVELOPERS" type="add">45404 - New class, hssf.usermodel.HSSFDataFormatter, for formatting numbers and dates in the same way that Excel does</action>
            <action dev="POI-DEVELOPERS" type="fix">45414 - Don't add too many UncalcedRecords to sheets with charts in them</action>
            <action dev="POI-DEVELOPERS" type="fix">45398 - Support detecting date formats containing "am/pm" as date times</action>

src/documentation/content/xdocs/status.xml

@@ -34,6 +34,7 @@
 	<!-- Don't forget to update changes.xml too! -->
     <changes>
         <release version="3.1.1-alpha1" date="2008-??-??">
+           <action dev="POI-DEVELOPERS" type="fix">45437 - Detect encrypted word documents, and throw an EncryptedDocumentException instead of a OOM</action>
            <action dev="POI-DEVELOPERS" type="add">45404 - New class, hssf.usermodel.HSSFDataFormatter, for formatting numbers and dates in the same way that Excel does</action>
            <action dev="POI-DEVELOPERS" type="fix">45414 - Don't add too many UncalcedRecords to sheets with charts in them</action>
            <action dev="POI-DEVELOPERS" type="fix">45398 - Support detecting date formats containing "am/pm" as date times</action>

src/java/org/apache/poi/EncryptedDocumentException.java

@@ -0,0 +1,24 @@
+/* ====================================================================
+   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;
+
+public class EncryptedDocumentException extends IllegalStateException
+{
+	public EncryptedDocumentException(String s) {
+		super(s);
+	}
+}

src/scratchpad/src/org/apache/poi/hslf/exceptions/EncryptedPowerPointFileException.java

@@ -1,4 +1,3 @@
-
 /* ====================================================================
    Licensed to the Apache Software Foundation (ASF) under one or more
    contributor license agreements.  See the NOTICE file distributed with
@@ -15,19 +14,15 @@
    See the License for the specific language governing permissions and
    limitations under the License.
 ==================================================================== */
-        
-
-
 package org.apache.poi.hslf.exceptions;
 
+import org.apache.poi.EncryptedDocumentException;
+
 /**
  * This exception is thrown when we try to open a PowerPoint file, and
  *  discover that it is encrypted
- *
- * @author Nick Burch
  */
-
-public class EncryptedPowerPointFileException extends IllegalStateException
+public class EncryptedPowerPointFileException extends EncryptedDocumentException
 {
 	public EncryptedPowerPointFileException(String s) {
 		super(s);

src/scratchpad/src/org/apache/poi/hwpf/HWPFDocument.java

@@ -28,6 +28,7 @@ import java.io.ByteArrayInputStream;
 
 import java.util.Iterator;
 
+import org.apache.poi.EncryptedDocumentException;
 import org.apache.poi.POIDocument;
 import org.apache.poi.poifs.filesystem.DirectoryNode;
 import org.apache.poi.poifs.filesystem.POIFSFileSystem;
@@ -174,9 +175,13 @@ public class HWPFDocument extends POIDocument
     
     directory.createDocumentInputStream("WordDocument").read(_mainStream);
 
-    // use the fib to determine the name of the table stream.
+    // Create our FIB, and check for the doc being encrypted
     _fib = new FileInformationBlock(_mainStream);
+    if(_fib.isFEncrypted()) {
+    	throw new EncryptedDocumentException("Cannot process encrypted word files!");
+    }
 
+    // use the fib to determine the name of the table stream.
     String name = "0Table";
     if (_fib.isFWhichTblStm())
     {

src/scratchpad/testcases/org/apache/poi/hwpf/usermodel/TestProblems.java

@@ -22,6 +22,7 @@ import java.io.FileOutputStream;
 
 import junit.framework.TestCase;
 
+import org.apache.poi.EncryptedDocumentException;
 import org.apache.poi.hwpf.HWPFDocument;
 import org.apache.poi.hwpf.model.StyleSheet;
 
@@ -138,4 +139,18 @@ public class TestProblems extends TestCase {
 		
 		assertEquals(newLength, totalLength - deletedLength);
 	}
+	
+	/**
+	 * With an encrypted file, we should give a suitable
+	 *  exception, and not OOM
+	 */
+	public void testEncryptedFile() throws Exception {
+		try {
+			new HWPFDocument(new FileInputStream(
+    			new File(dirname, "PasswordProtected.doc")));
+			fail();
+		} catch(EncryptedDocumentException e) {
+			// Good
+		}
+	}
 }