Adding jtar

[gigi.git] / lib / jtar / org / kamranzafar / jtar / TarUtils.java

diff --git a/lib/jtar/org/kamranzafar/jtar/TarUtils.java b/lib/jtar/org/kamranzafar/jtar/TarUtils.java
new file mode 100644 (file)
index 0000000..8dccc37
--- /dev/null
+++ b/lib/jtar/org/kamranzafar/jtar/TarUtils.java
@@ -0,0 +1,96 @@
+/**
+ * Copyright 2012 Kamran Zafar 
+ * 
+ * Licensed 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.kamranzafar.jtar;
+
+import java.io.File;
+
+/**
+ * @author Kamran
+ * 
+ */
+public class TarUtils {
+       /**
+        * Determines the tar file size of the given folder/file path
+        * 
+        * @param path
+        * @return
+        */
+       public static long calculateTarSize(File path) {
+               return tarSize(path) + TarConstants.EOF_BLOCK;
+       }
+
+       private static long tarSize(File dir) {
+               long size = 0;
+
+               if (dir.isFile()) {
+                       return entrySize(dir.length());
+               } else {
+                       File[] subFiles = dir.listFiles();
+
+                       if (subFiles != null && subFiles.length > 0) {
+                               for (File file : subFiles) {
+                                       if (file.isFile()) {
+                                               size += entrySize(file.length());
+                                       } else {
+                                               size += tarSize(file);
+                                       }
+                               }
+                       } else {
+                               // Empty folder header
+                               return TarConstants.HEADER_BLOCK;
+                       }
+               }
+
+               return size;
+       }
+
+       private static long entrySize(long fileSize) {
+               long size = 0;
+               size += TarConstants.HEADER_BLOCK; // Header
+               size += fileSize; // File size
+
+               long extra = size % TarConstants.DATA_BLOCK;
+
+               if (extra > 0) {
+                       size += (TarConstants.DATA_BLOCK - extra); // pad
+               }
+
+               return size;
+       }
+
+       public static String trim(String s, char c) {
+               StringBuffer tmp = new StringBuffer(s);
+               for (int i = 0; i < tmp.length(); i++) {
+                       if (tmp.charAt(i) != c) {
+                               break;
+                       } else {
+                               tmp.deleteCharAt(i);
+                       }
+               }
+
+               for (int i = tmp.length() - 1; i >= 0; i--) {
+                       if (tmp.charAt(i) != c) {
+                               break;
+                       } else {
+                               tmp.deleteCharAt(i);
+                       }
+               }
+
+               return tmp.toString();
+       }
+}