--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/srcanaapps/depexplorer/com.nokia.s60tools.appdep/src/com/nokia/s60tools/appdep/util/SISFileUtils.java	Sat Jan 09 10:04:11 2010 +0530
@@ -0,0 +1,83 @@
+/*
+* Copyright (c) 2007 Nokia Corporation and/or its subsidiary(-ies). 
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description:
+*
+*/
+ 
+package com.nokia.s60tools.appdep.util;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.RandomAccessFile;
+
+/**
+ * SIS file handling utilities needed by SIS file analysis feature.
+ */
+public class SISFileUtils {
+
+	// 
+	// Constants
+	//
+	private static final int BYTES_TO_READ_OFFSET = 0;
+	private static final int BYTES_TO_READ = 4;
+	private static final String FILE_MODE_READ = "r"; //$NON-NLS-1$
+	/**
+	 * If the first four bytes of the file are 7A1A2010, it is a valid supported SIS file.
+	 */
+	private static final byte [] FIRST_BYTES = new byte[]{0x07A,0x01A, 0x020, 0x010};
+
+	/**
+	 * Checks if file is valid/supported SIS file.
+	 * If the first four bytes of the file are 7A1A2010, it is a valid 
+	 * and supported SIS file.
+	 * @param fileName Absolute path name pointing to SIS file.
+	 * @return <code>true</code> if it was valid 9.x SIS file, otherwise <code>false</code>.
+	 */
+	public static boolean isValid_9x_SISFile(String fileName) {
+		
+		File file = new File(fileName);
+		if(!file.exists()){
+			return false;
+		}
+		try {
+			RandomAccessFile randFile = new RandomAccessFile(file, FILE_MODE_READ);
+			byte [] b = new byte[BYTES_TO_READ];
+			int off = BYTES_TO_READ_OFFSET;
+			int len = BYTES_TO_READ;
+			int read = randFile.read(b, off, len);
+			
+			if(read != BYTES_TO_READ){
+				return false;
+			}
+			boolean match = true;
+			for (int i = 0; i < b.length; i++) {
+				if(b[i] != FIRST_BYTES[i]){
+					match = false;
+				}
+			}
+			return match;
+		} catch (FileNotFoundException e) {
+			//Should newer occur, because files was selected from file list
+			e.printStackTrace();
+			return false;
+		} catch (IOException e) {
+			//Should newer occur, because files was selected from file list			
+			e.printStackTrace();
+			return false;
+		}
+		
+	}
+
+}