--- /dev/null
+/**
+ * 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();
+ }
+}