com.codename1.io.tar.TarUtils Maven / Gradle / Ivy
/**
* 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.
*
*/
/**
* The original source has been modified by Paul Williams.
*/
package com.codename1.io.tar;
import java.io.IOException;
import com.codename1.io.FileSystemStorage;
/**
* @author Kamran
*
*/
public class TarUtils {
/**
* Determines the tar file size of the given folder/file path
*
* @param path
* @return
* @throws IOException
*/
public static long calculateTarSize(String path) throws IOException {
return tarSize( path ) + TarConstants.EOF_BLOCK;
}
private static long tarSize(String path) throws IOException {
long size = 0;
FileSystemStorage fileSystem = FileSystemStorage.getInstance();
if (fileSystem.isDirectory(path)) {
String[] subFiles = fileSystem.listFiles(path);
if (subFiles != null && subFiles.length > 0) {
for (String file : subFiles) {
if (fileSystem.isDirectory(file)) {
size += tarSize( file );
} else {
size += entrySize( fileSystem.getLength(file) );
}
}
} else {
// Empty folder header
return TarConstants.HEADER_BLOCK;
}
} else {
return entrySize( fileSystem.getLength(path) );
}
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;
}
}