public void retrieveTotalBytes(File sourceFile)
		{
			ZipInputStream zis;
			try {
				zis = new ZipInputStream(new FileInputStream(sourceFile));
				ZipEntry ze = zis.getNextEntry();
				
				while(ze != null)
				{
					if(!ze.isDirectory())
					{
						totalBytes += ze.getSize();
					}
					ze = zis.getNextEntry();
				}
				zis.closeEntry();
				zis.close();
			} catch (FileNotFoundException e) {
				e.printStackTrace();
			} catch (IOException e) {
				e.printStackTrace();
			}
			
		}