Improve backup & wipe exclusion handling

Rename twrpDU.* to exclude.*
Remove global variable for du and replace with partition specific
variables.
Use separate exclusion lists for backups and wiping.
Clean up some includes
Fix some parenthesis in twrp.cpp that I messed up.

Note: twrpTarMain command line utility compiles but probably does
not work correctly yet due to not properly setting part_settings

Change-Id: Idec9c3e6a8782ba53f3420fa79ba33394f4f85fb

exclude.cpp

@@ -0,0 +1,108 @@
+/*
+		Copyright 2013 to 2016 TeamWin
+		This file is part of TWRP/TeamWin Recovery Project.
+
+		TWRP is free software: you can redistribute it and/or modify
+		it under the terms of the GNU General Public License as published by
+		the Free Software Foundation, either version 3 of the License, or
+		(at your option) any later version.
+
+		TWRP is distributed in the hope that it will be useful,
+		but WITHOUT ANY WARRANTY; without even the implied warranty of
+		MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+		GNU General Public License for more details.
+
+		You should have received a copy of the GNU General Public License
+		along with TWRP.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+extern "C" {
+	#include "libtar/libtar.h"
+}
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <dirent.h>
+#include <errno.h>
+#include <string>
+#include <vector>
+#include "exclude.hpp"
+#include "twrp-functions.hpp"
+#include "gui/gui.hpp"
+#include "twcommon.h"
+
+using namespace std;
+
+extern bool datamedia;
+
+TWExclude::TWExclude() {
+	add_relative_dir(".");
+	add_relative_dir("..");
+	add_relative_dir("lost+found");
+}
+
+void TWExclude::add_relative_dir(const string& dir) {
+	relativedir.push_back(dir);
+}
+
+void TWExclude::clear_relative_dir(string dir) {
+	vector<string>::iterator iter = relativedir.begin();
+	while (iter != relativedir.end()) {
+		if (*iter == dir)
+			iter = relativedir.erase(iter);
+		else
+			iter++;
+	}
+}
+
+void TWExclude::add_absolute_dir(const string& dir) {
+	absolutedir.push_back(TWFunc::Remove_Trailing_Slashes(dir));
+}
+
+uint64_t TWExclude::Get_Folder_Size(const string& Path) {
+	DIR* d;
+	struct dirent* de;
+	struct stat st;
+	uint64_t dusize = 0;
+	string FullPath;
+
+	d = opendir(Path.c_str());
+	if (d == NULL) {
+		gui_msg(Msg(msg::kError, "error_opening_strerr=Error opening: '{1}' ({2})")(Path)(strerror(errno)));
+		return 0;
+	}
+
+	while ((de = readdir(d)) != NULL) {
+		FullPath = Path + "/";
+		FullPath += de->d_name;
+		if (lstat(FullPath.c_str(), &st)) {
+			gui_msg(Msg(msg::kError, "error_opening_strerr=Error opening: '{1}' ({2})")(FullPath)(strerror(errno)));
+			LOGINFO("Real error: Unable to stat '%s'\n", FullPath.c_str());
+			continue;
+		}
+		if ((st.st_mode & S_IFDIR) && !check_skip_dirs(FullPath) && de->d_type != DT_SOCK) {
+			dusize += Get_Folder_Size(FullPath);
+		} else if (st.st_mode & S_IFREG) {
+			dusize += (uint64_t)(st.st_size);
+		}
+	}
+	closedir(d);
+	return dusize;
+}
+
+bool TWExclude::check_relative_skip_dirs(const string& dir) {
+	return std::find(relativedir.begin(), relativedir.end(), dir) != relativedir.end();
+}
+
+bool TWExclude::check_absolute_skip_dirs(const string& path) {
+	return std::find(absolutedir.begin(), absolutedir.end(), path) != absolutedir.end();
+}
+
+bool TWExclude::check_skip_dirs(const string& path) {
+	string normalized = TWFunc::Remove_Trailing_Slashes(path);
+	size_t slashIdx = normalized.find_last_of('/');
+	if(slashIdx != std::string::npos && slashIdx+1 < normalized.size()) {
+		if(check_relative_skip_dirs(normalized.substr(slashIdx+1)))
+			return true;
+	}
+	return check_absolute_skip_dirs(normalized);
+}