FileManager.cpp
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FileManager.cpp
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	/*
	* Copyright (C) 2011-2012 Me and My Shadow
	*
	* This file is part of Me and My Shadow.
	*
	* Me and My Shadow 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.
	*
	* Me and My Shadow 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 Me and My Shadow. If not, see <http://www.gnu.org/licenses/>.
	*/

	#include <stdio.h>
	#include <iostream>
	#include <string>
	#include <vector>
	#include "config.h"
	#include "FileManager.h"
	#include "Functions.h"
	#include "Settings.h"
	#include <SDL.h>
	#include <SDL_syswm.h>
	#include <archive.h>
	#include <archive_entry.h>

	using namespace std;

	#ifdef WIN32
	#include <windows.h>
	#include <shlobj.h>
	#include <shlwapi.h>
	#include <shellapi.h>
	#include <direct.h>
	#pragma comment(lib,"shell32.lib")
	#pragma comment(lib,"shlwapi.lib")
	#else
	#include <strings.h>
	#include <sys/stat.h>
	#include <sys/types.h>
	#include <unistd.h>
	#include <dirent.h>
	#endif

	//Included for the downloadFile method.
	#include <curl/curl.h>

	//Under Windows there's just one userpath.
	#ifdef WIN32
	string userPath,dataPath,appPath,exeName;
	#define TO_UTF8(SRC, DEST) WideCharToMultiByte(CP_UTF8, 0, SRC, -1, DEST, sizeof(DEST), NULL, NULL)
	#define TO_UTF16(SRC, DEST) MultiByteToWideChar(CP_UTF8, 0, SRC, -1, DEST, sizeof(DEST)/sizeof(DEST[0]))
	#else
	//But on other platforms we make a difference between the userPath (config files) and the userDataPath (data files).
	//Finally there's the path for cache data userCachePath.
	string userPath,userDataPath,userCachePath,dataPath,appPath,exeName;
	#endif

	bool configurePaths() {
	//Get the appPath and the exeName.
	{
	char s[4096];
	int i,m;
	#ifdef WIN32
	wchar_t ws[4096];
	m = GetModuleFileNameW(NULL, ws, sizeof(ws) / sizeof(ws[0]));
	ws[m] = 0;
	TO_UTF8(ws, s);
	m = strlen(s);
	#elif defined(ANDROID)
	//FIXME: Oops. There are no any executable files in Android.
	strcpy(s,"./meandmyshadow");
	m=strlen(s);
	#else
	m=readlink("/proc/self/exe",s,sizeof(s));
	#endif
	s[m]=0;
	for(i=m-1;i>=0&&i<4096;i--){
	if(s[i]=='/'\|\|s[i]=='\\'){
	s[i]=0;
	break;
	}
	}
	appPath=s;
	exeName=s+i+1;
	}

	//TODO: Check if the userpath is empty before setting userPath???
	//Check if the userPath is empty.
	if(getUserPath().empty()){
	#ifdef WIN32
	//Get the userPath.
	char s[4096];
	wchar_t ws[4096];
	SHGetSpecialFolderPathW(NULL,ws,CSIDL_PERSONAL,1);
	TO_UTF8(ws, s);
	userPath=s;
	userPath+="\\My Games\\meandmyshadow\\";
	#elif defined(ANDROID)
	//FIXME: These paths are relative to SDL Android data path.
	userPath="./";
	userDataPath="./";
	userCachePath="./";
	#else
	//Temp variable that is used to prevent NULL assignement.
	char* env;

	//First get the $XDG_CONFIG_HOME env var.
	env=getenv("XDG_CONFIG_HOME");
	//If it's null set userPath to $HOME/.config/.
	if(env!=NULL){
	userPath=env;
	}else{
	userPath=getenv("HOME");
	userPath+="/.config";
	}
	//And add meandmyshadow to it.
	userPath+="/meandmyshadow/";

	//Now get the $XDG_DATA_HOME env var.
	env=getenv("XDG_DATA_HOME");
	//If it's null set userDataPath to $HOME/.local/share.

	if(env!=NULL){
	userDataPath=env;
	}else{
	userDataPath=getenv("HOME");
	userDataPath+="/.local/share";
	}
	//And add meandmyshadow to it.
	userDataPath+="/meandmyshadow/";

	//Now get the $XDG_CACHE_HOME env var.
	env=getenv("XDG_CACHE_HOME");
	//If it's null set userCachePath to $HOME/.cache.
	if(env!=NULL){
	userCachePath=env;
	}else{
	userCachePath=getenv("HOME");
	userCachePath+="/.cache";
	}
	//And add meandmyshadow to it.
	userCachePath+="/meandmyshadow/";

	//Set env null.
	env=NULL;
	#endif

	//Print the userPath.
	cout<<"User preferences will be fetched from: "<<userPath<<endl;
	#ifndef WIN32
	//In case of a non-Windows computer show the user data path.
	cout<<"User data will be fetched from: "<<userDataPath<<endl;
	#endif
	}

	#ifdef WIN32
	//Create the userPath folder and other subfolders.
	createDirectory(userPath.c_str());
	createDirectory((userPath+"levels").c_str());
	createDirectory((userPath+"levelpacks").c_str());
	createDirectory((userPath+"themes").c_str());
	createDirectory((userPath+"music").c_str());
	//The progress folder and subfolders.
	createDirectory((userPath+"progress").c_str());
	createDirectory((userPath+"progress\\main").c_str());
	createDirectory((userPath+"progress\\addon").c_str());
	createDirectory((userPath+"progress\\custom").c_str());
	createDirectory((userPath+"tmp").c_str());
	createDirectory((userPath+"images").c_str());
	//The records folder for recordings.
	createDirectory((userPath+"records").c_str());
	createDirectory((userPath+"records\\autosave").c_str());
	//And the custom folder inside the userpath.
	createDirectory((userPath+"custom").c_str());
	createDirectory((userPath+"custom\\levels").c_str());
	createDirectory((userPath+"custom\\levelpacks").c_str());
	#else
	//Create the userPath.
	createDirectory(userPath.c_str());
	createDirectory(userDataPath.c_str());
	createDirectory(userCachePath.c_str());
	//Also create other folders in the userpath.
	createDirectory((userDataPath+"/levels").c_str());
	createDirectory((userDataPath+"/levelpacks").c_str());
	createDirectory((userDataPath+"/themes").c_str());
	createDirectory((userDataPath+"/music").c_str());
	//The progress folder and subfolders.
	createDirectory((userDataPath+"/progress").c_str());
	createDirectory((userDataPath+"/progress/main").c_str());
	createDirectory((userDataPath+"/progress/addon").c_str());
	createDirectory((userDataPath+"/progress/custom").c_str());
	createDirectory((userCachePath+"/tmp").c_str());
	createDirectory((userCachePath+"/images").c_str());
	//The records folder for recordings.
	createDirectory((userDataPath+"/records").c_str());
	createDirectory((userDataPath+"/records/autosave").c_str());
	//And the custom folder inside the userpath.
	createDirectory((userDataPath+"/custom").c_str());
	createDirectory((userDataPath+"/custom/levels").c_str());
	createDirectory((userDataPath+"/custom/levelpacks").c_str());
	#endif

	//Get the dataPath by trying multiple relative locations.
	{
	FILE *f;
	string s;
	while(true){
	//try existing one
	if(!dataPath.empty()){
	s=dataPath+"font/knewave.ttf";
	if((f=fopen(s.c_str(),"rb"))!=NULL){
	fclose(f);
	break;
	}
	}
	//try "./"
	dataPath="./data/";
	s=dataPath+"font/knewave.ttf";
	if((f=fopen(s.c_str(),"rb"))!=NULL){
	fclose(f);
	break;
	}
	//try "../"
	dataPath="../data/";
	s=dataPath+"font/knewave.ttf";
	if((f=fopen(s.c_str(),"rb"))!=NULL){
	fclose(f);
	break;
	}
	//try App.Path
	dataPath=getAppPath()+"/data/";
	s=dataPath+"font/knewave.ttf";
	if((f=fopen(s.c_str(),"rb"))!=NULL){
	fclose(f);
	break;
	}
	//try App.Path+"/../"
	dataPath=getAppPath()+"/../data/";
	s=dataPath+"font/knewave.ttf";
	if((f=fopen(s.c_str(),"rb"))!=NULL){
	fclose(f);
	break;
	}
	//try DATA_PATH
	#ifdef DATA_PATH
	dataPath=DATA_PATH;
	std::cout << "trying: " << dataPath << std::endl;
	s=dataPath+"font/knewave.ttf";
	if((f=fopen(s.c_str(),"rb"))!=NULL){
	fclose(f);
	break;
	}
	#endif
	#ifdef __APPLE__
	// TODO:
	/*extern std::string get_data_path();
	dataPath = get_data_path();
	dataPath=get_data_path();
	s=dataPath+"font/knewave.ttf";
	if((f=fopen(s.c_str(),"rb"))!=NULL){
	fclose(f);
	break;
	}
	*/
	#endif
	SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Error! Faild to find game data!",
	"The game data files could not be found!", NULL);
	//error: can't find file
	return false;
	}
	//Print the dataPath.
	cout<<"Data files will be fetched from: "<<dataPath<<endl;
	}
	return true;
	}

	std::vector<std::string> enumAllFiles(std::string path,const char* extension,bool containsPath){
	vector<string> v;
	#ifdef WIN32
	string s1;
	WIN32_FIND_DATAW f;
	if(!path.empty()){
	char c=path[path.size()-1];
	if(c!='/'&&c!='\\') path+="\\";
	}
	s1=path;
	if(extension!=NULL && *extension){
	s1+="*.";
	s1+=extension;
	}else{
	s1+="*";
	}
	wchar_t ws[4096];
	TO_UTF16(s1.c_str(), ws);
	HANDLE h=FindFirstFileW(ws,&f);
	if(h==NULL\|\|h==INVALID_HANDLE_VALUE) return v;
	do{
	if(!(f.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)){
	char s[1024];
	TO_UTF8(f.cFileName, s);
	if(containsPath){
	v.push_back(path+s);
	}else{
	v.push_back(s);
	}
	}
	}while(FindNextFileW(h,&f));
	FindClose(h);
	return v;
	#else
	int len=0;
	if(extension!=NULL && *extension) len=strlen(extension);
	if(!path.empty()){
	char c=path[path.size()-1];
	if(c!='/'&&c!='\\') path+="/";
	}
	DIR *pDir;
	struct dirent *pDirent;
	pDir=opendir(path.c_str());
	if(pDir==NULL) return v;
	while((pDirent=readdir(pDir))!=NULL){
	if(pDirent->d_name[0]=='.'){
	if(pDirent->d_name[1]==0\|\|
	(pDirent->d_name[1]=='.'&&pDirent->d_name[2]==0)) continue;
	}
	string s1=path+pDirent->d_name;
	struct stat S_stat;
	lstat(s1.c_str(),&S_stat);
	if(!S_ISDIR(S_stat.st_mode)){
	if(len>0){
	if((int)s1.size()<len+1) continue;
	if(s1[s1.size()-len-1]!='.') continue;
	if(strcasecmp(&s1[s1.size()-len],extension)) continue;
	}

	if(containsPath){
	v.push_back(s1);
	}else{
	v.push_back(string(pDirent->d_name));
	}
	}
	}
	closedir(pDir);
	return v;
	#endif
	}

	std::vector<std::string> enumAllDirs(std::string path,bool containsPath){
	vector<string> v;
	#ifdef WIN32
	string s1;
	WIN32_FIND_DATAW f;
	if(!path.empty()){
	char c=path[path.size()-1];
	if(c!='/'&&c!='\\') path+="\\";
	}
	s1=path+"*";
	wchar_t ws[4096];
	TO_UTF16(s1.c_str(), ws);
	HANDLE h = FindFirstFileW(ws, &f);
	if(h==NULL\|\|h==INVALID_HANDLE_VALUE) return v;
	do{
	// skip '.' and '..' and hidden folders
	if(f.cFileName[0]=='.'){
	/*if(f.cFileName[1]==0\|\|
	(f.cFileName[1]=='.'&&f.cFileName[2]==0))*/ continue;
	}
	if(f.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY){
	char s[1024];
	TO_UTF8(f.cFileName, s);
	if (containsPath){
	v.push_back(path+s);
	}else{
	v.push_back(s);
	}
	}
	}while(FindNextFileW(h,&f));
	FindClose(h);
	return v;
	#else
	if(!path.empty()){
	char c=path[path.size()-1];
	if(c!='/'&&c!='\\') path+="/";
	}
	DIR *pDir;
	struct dirent *pDirent;
	pDir=opendir(path.c_str());
	if(pDir==NULL) return v;
	while((pDirent=readdir(pDir))!=NULL){
	if(pDirent->d_name[0]=='.'){
	if(pDirent->d_name[1]==0\|\|
	(pDirent->d_name[1]=='.'&&pDirent->d_name[2]==0)) continue;
	}
	string s1=path+pDirent->d_name;
	struct stat S_stat;
	lstat(s1.c_str(),&S_stat);
	if(S_ISDIR(S_stat.st_mode)){
	//Skip hidden folders.
	s1=string(pDirent->d_name);
	if(s1.find('.')==0) continue;

	//Add result to vector.
	if(containsPath){
	v.push_back(path+pDirent->d_name);
	}else{
	v.push_back(s1);
	}
	}
	}
	closedir(pDir);
	return v;
	#endif
	}

	std::string processFileName(const std::string& s){
	string prefix=dataPath;

	//FIXME: Do we still need those last three?
	//REMARK: maybe 'return prefix+s;' is not needed (?)
	// it causes some bugs such as can't save level progress
	if(s.compare(0,6,"%DATA%")==0){
	if(s.size()>6 && (s[6]=='/' \|\| s[6]=='\\')){
	return dataPath+s.substr(7);
	}else{
	return dataPath+s.substr(6);
	}
	}else if(s.compare(0,6,"%USER%")==0){
	if(s.size()>6 && (s[6]=='/' \|\| s[6]=='\\')){
	return getUserPath(USER_DATA)+s.substr(7);
	}else{
	return getUserPath(USER_DATA)+s.substr(6);
	}
	}else if(s.compare(0,9,"%LVLPACK%")==0){
	if(s.size()>9 && (s[9]=='/' \|\| s[9]=='\\')){
	return prefix+"levelpacks/"+s.substr(10);
	}else{
	return prefix+"levelpacks/"+s.substr(9);
	}
	}else if(s.compare(0,5,"%LVL%")==0){
	if(s.size()>5 && (s[5]=='/' \|\| s[5]=='\\')){
	return prefix+"levels/"+s.substr(6);
	}else{
	return prefix+"levels/"+s.substr(5);
	}
	}else if(s.compare(0,8,"%THEMES%")==0){
	if(s.size()>8 && (s[8]=='/' \|\| s[8]=='\\')){
	return prefix+"themes/"+s.substr(9);
	}else{
	return prefix+"themes/"+s.substr(8);
	}
	}else if(s.size()>0 && (s[0]=='/' \|\| s[0]=='\\')){
	return s;
	#ifdef WIN32
	// Another fix for Windows :(
	}else if(s.size()>1 && (s[1]==':')){
	return s;
	#endif
	}else{
	#if defined(ANDROID)
	//REMARK: maybe 'return prefix+s;' is not needed (?)
	// it causes some bugs such as can't save level progress in Android.
	return s;
	#else
	return prefix+s;
	#endif
	}
	}

	std::string compressFileName(const std::string& s){
	//FIXME: Do we need the other ones from processFileName?

	//Check if the data path is at the start.
	size_t pos=s.find(getDataPath());
	if(pos!=string::npos){
	pos+=getDataPath().size();
	return "%DATA%/"+s.substr(pos);
	}
	pos=s.find(getUserPath(USER_DATA));
	if(pos!=string::npos){
	pos+=getUserPath(USER_DATA).size();
	return "%USER%/"+s.substr(pos);
	}

	return s;
	}

	std::string fileNameFromPath(const std::string &path, const bool webURL){
	std::string filename;
	size_t pos;
	#ifdef WIN32
	// NOTE: '/' in string should be '/' not '\/',
	// we don't need to escape it
	if(webURL){
	pos = path.find_last_of("/");
	}else{
	// NOTE: sometimes path separator in Windows can be '/',
	// so we must check botn '\' and '/'
	pos = path.find_last_of("\\/");
	}
	#else
	// NOTE: '/' in string should be '/' not '\/',
	// we don't need to escape it
	pos = path.find_last_of("/");
	#endif
	if(pos != std::string::npos)
	filename.assign(path.begin() + pos + 1, path.end());
	else
	filename=path;

	return filename;
	}

	std::string pathFromFileName(const std::string &filename){
	std::string path;
	// NOTE: '/' in string should be '/' not '\/',
	// we don't need to escape it
	#ifdef WIN32
	// NOTE: sometimes path separator in Windows can be '/',
	// so we must check botn '\' and '/'
	size_t pos = filename.find_last_of("\\/");
	#else
	size_t pos = filename.find_last_of("/");
	#endif
	if(pos != std::string::npos)
	path.assign(filename.begin(), filename.begin() + pos +1);
	else
	path=filename;

	return path;
	}

	bool downloadFile(const string &path, const string &destination) {
	string filename=fileNameFromPath(path,true);

	FILE* file = fopen((destination+filename).c_str(), "wb");
	bool status=downloadFile(path,file);
	fclose(file);

	//And return the status.
	return status;
	}

	bool downloadFile(const string &path, FILE* destination) {
	CURL* curl=curl_easy_init();

	// proxy test (test only)
	string internetProxy = getSettings()->getValue("internet-proxy");
	size_t pos = internetProxy.find_first_of(":");
	if(pos!=string::npos){
	curl_easy_setopt(curl,CURLOPT_PROXYPORT,atoi(internetProxy.substr(pos+1).c_str()));
	internetProxy = internetProxy.substr(0,pos);
	curl_easy_setopt(curl,CURLOPT_PROXY,internetProxy.c_str());
	}

	// NEW: append the path to addon_url if the path is relative
	std::string newPath;
	if (path.find("://") == string::npos) {
	newPath = getSettings()->getValue("addon_url");
	size_t p = newPath.find_last_of("\\/");
	if (p != string::npos) newPath = newPath.substr(0, p + 1);
	newPath += path;
	} else {
	newPath = path;
	}

	// debug
	#ifdef _DEBUG
	printf("Downloading %s\n", newPath.c_str());
	#endif

	curl_easy_setopt(curl, CURLOPT_URL, newPath.c_str());
	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, writeData);
	curl_easy_setopt(curl, CURLOPT_WRITEDATA, destination);
	curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
	curl_easy_setopt(curl, CURLOPT_MAXREDIRS, 8);
	CURLcode res = curl_easy_perform(curl);
	curl_easy_cleanup(curl);

	return (res==0);
	}

	size_t writeData(void ptr, size_t size, size_t nmemb, void stream){
	return fwrite(ptr, size, nmemb, (FILE *)stream);
	}


	bool extractFile(const string &fileName, const string &destination) {
	//Create the archive we're going to extract.
	archive* file;
	//Create the destination we're going to extract to.
	archive* dest;

	file=archive_read_new();
	dest=archive_write_disk_new();
	archive_write_disk_set_options(dest, ARCHIVE_EXTRACT_TIME);

	archive_read_support_format_zip(file);

	//Now read the archive.
	if(archive_read_open_filename(file,fileName.c_str(),10240)) {
	cerr<<"ERROR: An error occurred while reading archive "+fileName<<endl;
	return false;
	}

	//Now write every entry to disk.
	int status;
	archive_entry* entry=NULL;
	while(true) {
	status=archive_read_next_header(file,&entry);
	if(status==ARCHIVE_EOF){
	break;
	}
	if(status!=ARCHIVE_OK){
	cerr<<"ERROR: An error occurred while reading archive "+fileName<<endl;
	return false;
	}
	archive_entry_copy_pathname(entry,(destination+archive_entry_pathname(entry)).c_str());

	status=archive_write_header(dest,entry);
	if(status!=ARCHIVE_OK){
	cerr<<"ERROR: An error occurred while extracting archive "+fileName<<endl;
	return false;
	}else{
	copyData(file, dest);
	status=archive_write_finish_entry(dest);
	if(status!=ARCHIVE_OK){
	cerr<<"ERROR: An error occurred while extracting archive "+fileName<<endl;
	return false;
	}

	}
	}

	//Finally close the archive.
	archive_read_close(file);
	archive_read_free(file);
	return true;
	}

	bool dirExists(const char* dir){
	#if defined(WIN32)
	wchar_t ws[4096];
	TO_UTF16(dir, ws);
	DWORD attr=GetFileAttributesW(ws);
	if(attr==INVALID_FILE_ATTRIBUTES) return false;
	return (attr & FILE_ATTRIBUTE_DIRECTORY)!=0;
	#else
	struct stat sb;
	if(stat(dir,&sb) == 0 && S_ISDIR(sb.st_mode)){
	return true;
	}
	return false;
	#endif
	}

	bool createDirectory(const char* path){
	#ifdef WIN32
	wchar_t s0[4096],s1[4096],s[4096];

	GetCurrentDirectoryW(sizeof(s0)/sizeof(s0[0]),s0);
	TO_UTF16(path, s1);
	PathCombineW(s,s0,s1);

	for(unsigned int i=0;i<sizeof(s)/sizeof(s[0]);i++){
	if(s[i]=='\0') break;
	else if(s[i]=='/') s[i]='\\';
	}

	int ret = SHCreateDirectoryExW(NULL, s, NULL);
	switch(ret) {
	case ERROR_SUCCESS:
	case ERROR_FILE_EXISTS:
	case ERROR_ALREADY_EXISTS:
	return true;
	default:
	return false;
	}
	#else
	return mkdir(path,0777)==0;
	#endif
	}

	bool removeDirectory(const char *path){
	#ifdef WIN32
	SDL_SysWMinfo info = {};
	SDL_VERSION(&info.version);
	SDL_GetWindowWMInfo(sdlWindow, &info);

	wchar_t s0[4096], s1[4096], s[4096];

	GetCurrentDirectoryW(sizeof(s0) / sizeof(s0[0]), s0);
	TO_UTF16(path, s1);
	PathCombineW(s, s0, s1);

	for (unsigned int i = 0; i<sizeof(s) / sizeof(s[0]); i++){
	if (s[i] == '\0') {
	s[i + 1] = '\0';
	break;
	}
	else if (s[i] == '/') s[i] = '\\';
	}

	SHFILEOPSTRUCTW op = {
	info.info.win.window,
	FO_DELETE,
	s,
	NULL,
	FOF_NOCONFIRMATION \| FOF_NOERRORUI \| FOF_SILENT,
	FALSE,
	0,
	NULL,
	};
	int ret = SHFileOperationW(&op);
	return ret == 0 && op.fAnyOperationsAborted == FALSE;
	#else
	//Open the directory that needs to be removed.
	DIR* d=opendir(path);
	//Get the path length
	size_t path_len = strlen(path);
	//Boolean if the directory is emptied.
	//True: succes False: failure
	//Default is true because if the directory is empty it will never enter the while loop, but we still have success.
	bool r = true;

	//Check if the directory exists.
	if(d) {
	//Pointer to an entry of the directory.
	struct dirent* p;

	//Loop the entries of the directory that needs to be removed as long as there's no error.
	while(r && (p=readdir(d))) {

	/* Skip the names "." and ".." as we don't want to recurse on them. */
	if (!strcmp(p->d_name, ".") \|\| !strcmp(p->d_name, "..")) {
	//The filename is . or .. so we continue to the next entry.
	continue;
	} else {
	//r2 tells if the entry is deleted.
	//True: succes False: failure
	//Default is false.
	bool r2 = false;
	char* buf;
	size_t len;

	//Get the length of the path + the directory entry name.
	len = path_len + strlen(p->d_name) + 2;
	buf = (char*) malloc(len);

	if(buf) {
	struct stat statbuf;
	snprintf(buf, len, "%s/%s", path, p->d_name);

	if(!stat(buf, &statbuf)){
	//Check if the entry is a directory or a file.
	if (S_ISDIR(statbuf.st_mode)){
	//We call ourself(removeDirectory) recursively.
	//We return true on success.
	r2 = removeDirectory(buf);
	}else{
	//unlink() returns zero on succes so we set r2 to the unlink(buf)==0.
	r2 = unlink(buf)==0;
	}
	}
	//Free the buf.
	free(buf);
	}
	//We set r to r2 since r2 contains the status of the latest deletion.
	r = r2;
	}
	}
	//Close the directory.
	closedir(d);
	}

	//The while loop has ended, meaning we (tried) cleared the directory.
	//If r is true, meaning no errors we can delete the directory.
	if(r){
	//The return value of rmdir is 0 when it succeeded.
	r = rmdir(path)==0;
	}

	//Return the status.
	return r;
	#endif
	}

	bool renameDirectory(const char* oldPath,const char* newPath){
	return rename(oldPath,newPath)==0;
	}


	void copyData(archive* file, archive* dest) {
	int status;
	const void* buff;
	size_t size;
	#if ARCHIVE_VERSION_NUMBER < 3000000
	off_t offset;
	#else
	int64_t offset;
	#endif


	while(true) {
	status=archive_read_data_block(file, &buff, &size, &offset);
	if(status==ARCHIVE_EOF){
	return;
	}
	if(status!=ARCHIVE_OK){
	cerr<<"ERROR: An error occurred while writing data to disk."<<endl;
	return;
	}
	status=archive_write_data_block(dest, buff, size, offset);
	if(status!=ARCHIVE_OK) {
	cerr<<"ERROR: An error occurred while writing data to disk."<<endl;
	return;
	}
	}
	}

	bool copyFile(const char* source,const char* dest){
	//Open the source file.
	ifstream fin(source,fstream::binary);
	if(!fin)
	return false;

	//Open the dest file.
	ofstream fout(dest,fstream::trunc\|fstream::binary);
	if(!fout)
	return false;

	//Copy.
	fout<<fin.rdbuf();
	return true;
	}

	bool removeFile(const char* file){
	return remove(file)==0;
	}

	bool fileExists(const char* file){
	#ifdef WIN32
	wchar_t ws[4096];
	TO_UTF16(file, ws);
	bool ret=false;
	HANDLE h=CreateFileW(ws,0,FILE_SHARE_READ \| FILE_SHARE_WRITE \| FILE_SHARE_DELETE,NULL,OPEN_EXISTING,0,NULL);
	if(h!=INVALID_HANDLE_VALUE){
	ret=true;
	CloseHandle(h);
	}
	return ret;
	#else
	return (access(file,F_OK)==0);
	#endif
	}

	bool createFile(const char* file){
	//Open the file with write permission.
	FILE* f=fopen(file,"wb");

	//Check if there are no problems.
	if(f){
	//Close the file.
	fclose(f);
	return true;
	}else{
	return false;
	}
	}

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