Improve progress bar handling for backup / restore / image flash

The progress bar will now be updated during image backups, restores
and during image flashing (except for sparse images which will require
significant changes to libsparse, and except for mtd nand using

The progress bar will now be updated mid-file for file systems (tar) so
the user will see changes even during large file backup / restore.

Add a new progress tracking class to simplify handling of progress bar
updates. The class will only update the progress bar 5 times a second to
reduce the CPU load from updating the GUI frequently which does affect
backup times.

Change-Id: Iff382faef3df1f86604af336c1a8ce8993cd12c5
diff --git a/twrpTar.hpp b/twrpTar.hpp
index a486c41..8ef5020 100644
--- a/twrpTar.hpp
+++ b/twrpTar.hpp
@@ -1,5 +1,5 @@
-        Copyright 2012 bigbiff/Dees_Troy TeamWin
+        Copyright 2012 to 2016 bigbiff/Dees_Troy TeamWin
         This file is part of TWRP/TeamWin Recovery Project.
         TWRP is free software: you can redistribute it and/or modify
@@ -28,6 +28,7 @@
 #include <string>
 #include <vector>
 #include "twrpDU.hpp"
+#include "progresstracking.hpp"
 using namespace std;
@@ -45,8 +46,8 @@
 	virtual ~twrpTar();
-	int createTarFork(const unsigned long long *overall_size, const unsigned long long *other_backups_size, pid_t &fork_pid);
-	int extractTarFork(const unsigned long long *overall_size, unsigned long long *other_backups_size);
+	int createTarFork(ProgressTracking *progress, pid_t &fork_pid);
+	int extractTarFork(ProgressTracking *progress);
 	void setfn(string fn);
 	void setdir(string dir);
 	void setsize(unsigned long long backup_size);
@@ -87,6 +88,7 @@
 	unsigned long long Total_Backup_Size;
 	bool include_root_dir;
 	TAR *t;
+	tartype_t tar_type; // Only used in createTar() but variable must persist while the tar is open
 	int fd;
 	pid_t pigz_pid;
 	pid_t oaes_pid;