src/filesys.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "filesys.h"
  21 #include "util/string.h"
  22 #include <iostream>
  23 #include <cstdio>
  24 #include <cstring>
  25 #include <cerrno>
  26 #include <fstream>
  27 #include "log.h"
  28 #include "config.h"
  29 #include "porting.h"
  30
  31 namespace fs
  32 {
  33
  34 #ifdef _WIN32 // WINDOWS
  35
  36 #define _WIN32_WINNT 0x0501
  37 #include <windows.h>
  38 #include <shlwapi.h>
  39
  40 std::vector<DirListNode> GetDirListing(const std::string &pathstring)
  41 {
  42         std::vector<DirListNode> listing;
  43
  44         WIN32_FIND_DATA FindFileData;
  45         HANDLE hFind = INVALID_HANDLE_VALUE;
  46         DWORD dwError;
  47
  48         std::string dirSpec = pathstring + "\\*";
  49
  50         // Find the first file in the directory.
  51         hFind = FindFirstFile(dirSpec.c_str(), &FindFileData);
  52
  53         if (hFind == INVALID_HANDLE_VALUE) {
  54                 dwError = GetLastError();
  55                 if (dwError != ERROR_FILE_NOT_FOUND && dwError != ERROR_PATH_NOT_FOUND) {
  56                         errorstream << "GetDirListing: FindFirstFile error."
  57                                         << " Error is " << dwError << std::endl;
  58                 }
  59         } else {
  60                 // NOTE:
  61                 // Be very sure to not include '..' in the results, it will
  62                 // result in an epic failure when deleting stuff.
  63
  64                 DirListNode node;
  65                 node.name = FindFileData.cFileName;
  66                 node.dir = FindFileData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY;
  67                 if (node.name != "." && node.name != "..")
  68                         listing.push_back(node);
  69
  70                 // List all the other files in the directory.
  71                 while (FindNextFile(hFind, &FindFileData) != 0) {
  72                         DirListNode node;
  73                         node.name = FindFileData.cFileName;
  74                         node.dir = FindFileData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY;
  75                         if(node.name != "." && node.name != "..")
  76                                 listing.push_back(node);
  77                 }
  78
  79                 dwError = GetLastError();
  80                 FindClose(hFind);
  81                 if (dwError != ERROR_NO_MORE_FILES) {
  82                         errorstream << "GetDirListing: FindNextFile error."
  83                                         << " Error is " << dwError << std::endl;
  84                         listing.clear();
  85                         return listing;
  86                 }
  87         }
  88         return listing;
  89 }
  90
  91 bool CreateDir(const std::string &path)
  92 {
  93         bool r = CreateDirectory(path.c_str(), NULL);
  94         if(r == true)
  95                 return true;
  96         if(GetLastError() == ERROR_ALREADY_EXISTS)
  97                 return true;
  98         return false;
  99 }
 100
 101 bool PathExists(const std::string &path)
 102 {
 103         return (GetFileAttributes(path.c_str()) != INVALID_FILE_ATTRIBUTES);
 104 }
 105
 106 bool IsPathAbsolute(const std::string &path)
 107 {
 108         return !PathIsRelative(path.c_str());
 109 }
 110
 111 bool IsDir(const std::string &path)
 112 {
 113         DWORD attr = GetFileAttributes(path.c_str());
 114         return (attr != INVALID_FILE_ATTRIBUTES &&
 115                         (attr & FILE_ATTRIBUTE_DIRECTORY));
 116 }
 117
 118 bool IsDirDelimiter(char c)
 119 {
 120         return c == '/' || c == '\\';
 121 }
 122
 123 bool RecursiveDelete(const std::string &path)
 124 {
 125         infostream << "Recursively deleting \"" << path << "\"" << std::endl;
 126         if (!IsDir(path)) {
 127                 infostream << "RecursiveDelete: Deleting file  " << path << std::endl;
 128                 if (!DeleteFile(path.c_str())) {
 129                         errorstream << "RecursiveDelete: Failed to delete file "
 130                                         << path << std::endl;
 131                         return false;
 132                 }
 133                 return true;
 134         }
 135         infostream << "RecursiveDelete: Deleting content of directory "
 136                         << path << std::endl;
 137         std::vector<DirListNode> content = GetDirListing(path);
 138         for (const DirListNode &n: content) {
 139                 std::string fullpath = path + DIR_DELIM + n.name;
 140                 if (!RecursiveDelete(fullpath)) {
 141                         errorstream << "RecursiveDelete: Failed to recurse to "
 142                                         << fullpath << std::endl;
 143                         return false;
 144                 }
 145         }
 146         infostream << "RecursiveDelete: Deleting directory " << path << std::endl;
 147         if (!RemoveDirectory(path.c_str())) {
 148                 errorstream << "Failed to recursively delete directory "
 149                                 << path << std::endl;
 150                 return false;
 151         }
 152         return true;
 153 }
 154
 155 bool DeleteSingleFileOrEmptyDirectory(const std::string &path)
 156 {
 157         DWORD attr = GetFileAttributes(path.c_str());
 158         bool is_directory = (attr != INVALID_FILE_ATTRIBUTES &&
 159                         (attr & FILE_ATTRIBUTE_DIRECTORY));
 160         if(!is_directory)
 161         {
 162                 bool did = DeleteFile(path.c_str());
 163                 return did;
 164         }
 165         else
 166         {
 167                 bool did = RemoveDirectory(path.c_str());
 168                 return did;
 169         }
 170 }
 171
 172 std::string TempPath()
 173 {
 174         DWORD bufsize = GetTempPath(0, NULL);
 175         if(bufsize == 0){
 176                 errorstream<<"GetTempPath failed, error = "<<GetLastError()<<std::endl;
 177                 return "";
 178         }
 179         std::vector<char> buf(bufsize);
 180         DWORD len = GetTempPath(bufsize, &buf[0]);
 181         if(len == 0 || len > bufsize){
 182                 errorstream<<"GetTempPath failed, error = "<<GetLastError()<<std::endl;
 183                 return "";
 184         }
 185         return std::string(buf.begin(), buf.begin() + len);
 186 }
 187
 188 #else // POSIX
 189
 190 #include <sys/types.h>
 191 #include <dirent.h>
 192 #include <sys/stat.h>
 193 #include <sys/wait.h>
 194 #include <unistd.h>
 195
 196 std::vector<DirListNode> GetDirListing(const std::string &pathstring)
 197 {
 198         std::vector<DirListNode> listing;
 199
 200         DIR *dp;
 201         struct dirent *dirp;
 202         if((dp = opendir(pathstring.c_str())) == NULL) {
 203                 //infostream<<"Error("<<errno<<") opening "<<pathstring<<std::endl;
 204                 return listing;
 205         }
 206
 207         while ((dirp = readdir(dp)) != NULL) {
 208                 // NOTE:
 209                 // Be very sure to not include '..' in the results, it will
 210                 // result in an epic failure when deleting stuff.
 211                 if(strcmp(dirp->d_name, ".") == 0 || strcmp(dirp->d_name, "..") == 0)
 212                         continue;
 213
 214                 DirListNode node;
 215                 node.name = dirp->d_name;
 216
 217                 int isdir = -1; // -1 means unknown
 218
 219                 /*
 220                         POSIX doesn't define d_type member of struct dirent and
 221                         certain filesystems on glibc/Linux will only return
 222                         DT_UNKNOWN for the d_type member.
 223
 224                         Also we don't know whether symlinks are directories or not.
 225                 */
 226 #ifdef _DIRENT_HAVE_D_TYPE
 227                 if(dirp->d_type != DT_UNKNOWN && dirp->d_type != DT_LNK)
 228                         isdir = (dirp->d_type == DT_DIR);
 229 #endif /* _DIRENT_HAVE_D_TYPE */
 230
 231                 /*
 232                         Was d_type DT_UNKNOWN, DT_LNK or nonexistent?
 233                         If so, try stat().
 234                 */
 235                 if(isdir == -1) {
 236                         struct stat statbuf{};
 237                         if (stat((pathstring + "/" + node.name).c_str(), &statbuf))
 238                                 continue;
 239                         isdir = ((statbuf.st_mode & S_IFDIR) == S_IFDIR);
 240                 }
 241                 node.dir = isdir;
 242                 listing.push_back(node);
 243         }
 244         closedir(dp);
 245
 246         return listing;
 247 }
 248
 249 bool CreateDir(const std::string &path)
 250 {
 251         int r = mkdir(path.c_str(), S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH);
 252         if (r == 0) {
 253                 return true;
 254         }
 255
 256         // If already exists, return true
 257         if (errno == EEXIST)
 258                 return true;
 259         return false;
 260
 261 }
 262
 263 bool PathExists(const std::string &path)
 264 {
 265         struct stat st{};
 266         return (stat(path.c_str(),&st) == 0);
 267 }
 268
 269 bool IsPathAbsolute(const std::string &path)
 270 {
 271         return path[0] == '/';
 272 }
 273
 274 bool IsDir(const std::string &path)
 275 {
 276         struct stat statbuf{};
 277         if(stat(path.c_str(), &statbuf))
 278                 return false; // Actually error; but certainly not a directory
 279         return ((statbuf.st_mode & S_IFDIR) == S_IFDIR);
 280 }
 281
 282 bool IsDirDelimiter(char c)
 283 {
 284         return c == '/';
 285 }
 286
 287 bool RecursiveDelete(const std::string &path)
 288 {
 289         /*
 290                 Execute the 'rm' command directly, by fork() and execve()
 291         */
 292
 293         infostream<<"Removing \""<<path<<"\""<<std::endl;
 294
 295         pid_t child_pid = fork();
 296
 297         if(child_pid == 0)
 298         {
 299                 // Child
 300                 const char *argv[4] = {
 301 #ifdef __ANDROID__
 302                         "/system/bin/rm",
 303 #else
 304                         "/bin/rm",
 305 #endif
 306                         "-rf",
 307                         path.c_str(),
 308                         NULL
 309                 };
 310
 311                 verbosestream<<"Executing '"<<argv[0]<<"' '"<<argv[1]<<"' '"
 312                                 <<argv[2]<<"'"<<std::endl;
 313
 314                 execv(argv[0], const_cast<char**>(argv));
 315
 316                 // Execv shouldn't return. Failed.
 317                 _exit(1);
 318         }
 319         else
 320         {
 321                 // Parent
 322                 int child_status;
 323                 pid_t tpid;
 324                 do{
 325                         tpid = wait(&child_status);
 326                 }while(tpid != child_pid);
 327                 return (child_status == 0);
 328         }
 329 }
 330
 331 bool DeleteSingleFileOrEmptyDirectory(const std::string &path)
 332 {
 333         if (IsDir(path)) {
 334                 bool did = (rmdir(path.c_str()) == 0);
 335                 if (!did)
 336                         errorstream << "rmdir errno: " << errno << ": " << strerror(errno)
 337                                         << std::endl;
 338                 return did;
 339         }
 340
 341         bool did = (unlink(path.c_str()) == 0);
 342         if (!did)
 343                 errorstream << "unlink errno: " << errno << ": " << strerror(errno)
 344                                 << std::endl;
 345         return did;
 346 }
 347
 348 std::string TempPath()
 349 {
 350         /*
 351                 Should the environment variables TMPDIR, TMP and TEMP
 352                 and the macro P_tmpdir (if defined by stdio.h) be checked
 353                 before falling back on /tmp?
 354
 355                 Probably not, because this function is intended to be
 356                 compatible with lua's os.tmpname which under the default
 357                 configuration hardcodes mkstemp("/tmp/lua_XXXXXX").
 358         */
 359
 360 #ifdef __ANDROID__
 361         return porting::path_cache;
 362 #else
 363         return DIR_DELIM "tmp";
 364 #endif
 365 }
 366
 367 #endif
 368
 369 void GetRecursiveDirs(std::vector<std::string> &dirs, const std::string &dir)
 370 {
 371         static const std::set<char> chars_to_ignore = { '_', '.' };
 372         if (dir.empty() || !IsDir(dir))
 373                 return;
 374         dirs.push_back(dir);
 375         fs::GetRecursiveSubPaths(dir, dirs, false, chars_to_ignore);
 376 }
 377
 378 std::vector<std::string> GetRecursiveDirs(const std::string &dir)
 379 {
 380         std::vector<std::string> result;
 381         GetRecursiveDirs(result, dir);
 382         return result;
 383 }
 384
 385 void GetRecursiveSubPaths(const std::string &path,
 386                   std::vector<std::string> &dst,
 387                   bool list_files,
 388                   const std::set<char> &ignore)
 389 {
 390         std::vector<DirListNode> content = GetDirListing(path);
 391         for (const auto &n : content) {
 392                 std::string fullpath = path + DIR_DELIM + n.name;
 393                 if (ignore.count(n.name[0]))
 394                         continue;
 395                 if (list_files || n.dir)
 396                         dst.push_back(fullpath);
 397                 if (n.dir)
 398                         GetRecursiveSubPaths(fullpath, dst, list_files, ignore);
 399         }
 400 }
 401
 402 bool RecursiveDeleteContent(const std::string &path)
 403 {
 404         infostream<<"Removing content of \""<<path<<"\""<<std::endl;
 405         std::vector<DirListNode> list = GetDirListing(path);
 406         for (const DirListNode &dln : list) {
 407                 if(trim(dln.name) == "." || trim(dln.name) == "..")
 408                         continue;
 409                 std::string childpath = path + DIR_DELIM + dln.name;
 410                 bool r = RecursiveDelete(childpath);
 411                 if(!r) {
 412                         errorstream << "Removing \"" << childpath << "\" failed" << std::endl;
 413                         return false;
 414                 }
 415         }
 416         return true;
 417 }
 418
 419 bool CreateAllDirs(const std::string &path)
 420 {
 421
 422         std::vector<std::string> tocreate;
 423         std::string basepath = path;
 424         while(!PathExists(basepath))
 425         {
 426                 tocreate.push_back(basepath);
 427                 basepath = RemoveLastPathComponent(basepath);
 428                 if(basepath.empty())
 429                         break;
 430         }
 431         for(int i=tocreate.size()-1;i>=0;i--)
 432                 if(!CreateDir(tocreate[i]))
 433                         return false;
 434         return true;
 435 }
 436
 437 bool CopyFileContents(const std::string &source, const std::string &target)
 438 {
 439         FILE *sourcefile = fopen(source.c_str(), "rb");
 440         if(sourcefile == NULL){
 441                 errorstream<<source<<": can't open for reading: "
 442                         <<strerror(errno)<<std::endl;
 443                 return false;
 444         }
 445
 446         FILE *targetfile = fopen(target.c_str(), "wb");
 447         if(targetfile == NULL){
 448                 errorstream<<target<<": can't open for writing: "
 449                         <<strerror(errno)<<std::endl;
 450                 fclose(sourcefile);
 451                 return false;
 452         }
 453
 454         size_t total = 0;
 455         bool retval = true;
 456         bool done = false;
 457         char readbuffer[BUFSIZ];
 458         while(!done){
 459                 size_t readbytes = fread(readbuffer, 1,
 460                                 sizeof(readbuffer), sourcefile);
 461                 total += readbytes;
 462                 if(ferror(sourcefile)){
 463                         errorstream<<source<<": IO error: "
 464                                 <<strerror(errno)<<std::endl;
 465                         retval = false;
 466                         done = true;
 467                 }
 468                 if(readbytes > 0){
 469                         fwrite(readbuffer, 1, readbytes, targetfile);
 470                 }
 471                 if(feof(sourcefile) || ferror(sourcefile)){
 472                         // flush destination file to catch write errors
 473                         // (e.g. disk full)
 474                         fflush(targetfile);
 475                         done = true;
 476                 }
 477                 if(ferror(targetfile)){
 478                         errorstream<<target<<": IO error: "
 479                                         <<strerror(errno)<<std::endl;
 480                         retval = false;
 481                         done = true;
 482                 }
 483         }
 484         infostream<<"copied "<<total<<" bytes from "
 485                 <<source<<" to "<<target<<std::endl;
 486         fclose(sourcefile);
 487         fclose(targetfile);
 488         return retval;
 489 }
 490
 491 bool CopyDir(const std::string &source, const std::string &target)
 492 {
 493         if(PathExists(source)){
 494                 if(!PathExists(target)){
 495                         fs::CreateAllDirs(target);
 496                 }
 497                 bool retval = true;
 498                 std::vector<DirListNode> content = fs::GetDirListing(source);
 499
 500                 for (const auto &dln : content) {
 501                         std::string sourcechild = source + DIR_DELIM + dln.name;
 502                         std::string targetchild = target + DIR_DELIM + dln.name;
 503                         if(dln.dir){
 504                                 if(!fs::CopyDir(sourcechild, targetchild)){
 505                                         retval = false;
 506                                 }
 507                         }
 508                         else {
 509                                 if(!fs::CopyFileContents(sourcechild, targetchild)){
 510                                         retval = false;
 511                                 }
 512                         }
 513                 }
 514                 return retval;
 515         }
 516
 517         return false;
 518 }
 519
 520 bool PathStartsWith(const std::string &path, const std::string &prefix)
 521 {
 522         size_t pathsize = path.size();
 523         size_t pathpos = 0;
 524         size_t prefixsize = prefix.size();
 525         size_t prefixpos = 0;
 526         for(;;){
 527                 bool delim1 = pathpos == pathsize
 528                         || IsDirDelimiter(path[pathpos]);
 529                 bool delim2 = prefixpos == prefixsize
 530                         || IsDirDelimiter(prefix[prefixpos]);
 531
 532                 if(delim1 != delim2)
 533                         return false;
 534
 535                 if(delim1){
 536                         while(pathpos < pathsize &&
 537                                         IsDirDelimiter(path[pathpos]))
 538                                 ++pathpos;
 539                         while(prefixpos < prefixsize &&
 540                                         IsDirDelimiter(prefix[prefixpos]))
 541                                 ++prefixpos;
 542                         if(prefixpos == prefixsize)
 543                                 return true;
 544                         if(pathpos == pathsize)
 545                                 return false;
 546                 }
 547                 else{
 548                         size_t len = 0;
 549                         do{
 550                                 char pathchar = path[pathpos+len];
 551                                 char prefixchar = prefix[prefixpos+len];
 552                                 if(FILESYS_CASE_INSENSITIVE){
 553                                         pathchar = tolower(pathchar);
 554                                         prefixchar = tolower(prefixchar);
 555                                 }
 556                                 if(pathchar != prefixchar)
 557                                         return false;
 558                                 ++len;
 559                         } while(pathpos+len < pathsize
 560                                         && !IsDirDelimiter(path[pathpos+len])
 561                                         && prefixpos+len < prefixsize
 562                                         && !IsDirDelimiter(
 563                                                 prefix[prefixpos+len]));
 564                         pathpos += len;
 565                         prefixpos += len;
 566                 }
 567         }
 568 }
 569
 570 std::string RemoveLastPathComponent(const std::string &path,
 571                 std::string *removed, int count)
 572 {
 573         if(removed)
 574                 *removed = "";
 575
 576         size_t remaining = path.size();
 577
 578         for(int i = 0; i < count; ++i){
 579                 // strip a dir delimiter
 580                 while(remaining != 0 && IsDirDelimiter(path[remaining-1]))
 581                         remaining--;
 582                 // strip a path component
 583                 size_t component_end = remaining;
 584                 while(remaining != 0 && !IsDirDelimiter(path[remaining-1]))
 585                         remaining--;
 586                 size_t component_start = remaining;
 587                 // strip a dir delimiter
 588                 while(remaining != 0 && IsDirDelimiter(path[remaining-1]))
 589                         remaining--;
 590                 if(removed){
 591                         std::string component = path.substr(component_start,
 592                                         component_end - component_start);
 593                         if(i)
 594                                 *removed = component + DIR_DELIM + *removed;
 595                         else
 596                                 *removed = component;
 597                 }
 598         }
 599         return path.substr(0, remaining);
 600 }
 601
 602 std::string RemoveRelativePathComponents(std::string path)
 603 {
 604         size_t pos = path.size();
 605         size_t dotdot_count = 0;
 606         while (pos != 0) {
 607                 size_t component_with_delim_end = pos;
 608                 // skip a dir delimiter
 609                 while (pos != 0 && IsDirDelimiter(path[pos-1]))
 610                         pos--;
 611                 // strip a path component
 612                 size_t component_end = pos;
 613                 while (pos != 0 && !IsDirDelimiter(path[pos-1]))
 614                         pos--;
 615                 size_t component_start = pos;
 616
 617                 std::string component = path.substr(component_start,
 618                                 component_end - component_start);
 619                 bool remove_this_component = false;
 620                 if (component == ".") {
 621                         remove_this_component = true;
 622                 } else if (component == "..") {
 623                         remove_this_component = true;
 624                         dotdot_count += 1;
 625                 } else if (dotdot_count != 0) {
 626                         remove_this_component = true;
 627                         dotdot_count -= 1;
 628                 }
 629
 630                 if (remove_this_component) {
 631                         while (pos != 0 && IsDirDelimiter(path[pos-1]))
 632                                 pos--;
 633                         if (component_start == 0) {
 634                                 // We need to remove the delemiter too
 635                                 path = path.substr(component_with_delim_end, std::string::npos);
 636                         } else {
 637                                 path = path.substr(0, pos) + DIR_DELIM +
 638                                         path.substr(component_with_delim_end, std::string::npos);
 639                         }
 640                         if (pos > 0)
 641                                 pos++;
 642                 }
 643         }
 644
 645         if (dotdot_count > 0)
 646                 return "";
 647
 648         // remove trailing dir delimiters
 649         pos = path.size();
 650         while (pos != 0 && IsDirDelimiter(path[pos-1]))
 651                 pos--;
 652         return path.substr(0, pos);
 653 }
 654
 655 std::string AbsolutePath(const std::string &path)
 656 {
 657 #ifdef _WIN32
 658         char *abs_path = _fullpath(NULL, path.c_str(), MAX_PATH);
 659 #else
 660         char *abs_path = realpath(path.c_str(), NULL);
 661 #endif
 662         if (!abs_path) return "";
 663         std::string abs_path_str(abs_path);
 664         free(abs_path);
 665         return abs_path_str;
 666 }
 667
 668 const char *GetFilenameFromPath(const char *path)
 669 {
 670         const char *filename = strrchr(path, DIR_DELIM_CHAR);
 671         // Consistent with IsDirDelimiter this function handles '/' too
 672         if (DIR_DELIM_CHAR != '/') {
 673                 const char *tmp = strrchr(path, '/');
 674                 if (tmp && tmp > filename)
 675                         filename = tmp;
 676         }
 677         return filename ? filename + 1 : path;
 678 }
 679
 680 bool safeWriteToFile(const std::string &path, const std::string &content)
 681 {
 682         std::string tmp_file = path + ".~mt";
 683
 684         // Write to a tmp file
 685         std::ofstream os(tmp_file.c_str(), std::ios::binary);
 686         if (!os.good())
 687                 return false;
 688         os << content;
 689         os.flush();
 690         os.close();
 691         if (os.fail()) {
 692                 // Remove the temporary file because writing it failed and it's useless.
 693                 remove(tmp_file.c_str());
 694                 return false;
 695         }
 696
 697         bool rename_success = false;
 698
 699         // Move the finished temporary file over the real file
 700 #ifdef _WIN32
 701         // When creating the file, it can cause Windows Search indexer, virus scanners and other apps
 702         // to query the file. This can make the move file call below fail.
 703         // We retry up to 5 times, with a 1ms sleep between, before we consider the whole operation failed
 704         int number_attempts = 0;
 705         while (number_attempts < 5) {
 706                 rename_success = MoveFileEx(tmp_file.c_str(), path.c_str(),
 707                                 MOVEFILE_REPLACE_EXISTING | MOVEFILE_WRITE_THROUGH);
 708                 if (rename_success)
 709                         break;
 710                 sleep_ms(1);
 711                 ++number_attempts;
 712         }
 713 #else
 714         // On POSIX compliant systems rename() is specified to be able to swap the
 715         // file in place of the destination file, making this a truly error-proof
 716         // transaction.
 717         rename_success = rename(tmp_file.c_str(), path.c_str()) == 0;
 718 #endif
 719         if (!rename_success) {
 720                 warningstream << "Failed to write to file: " << path.c_str() << std::endl;
 721                 // Remove the temporary file because moving it over the target file
 722                 // failed.
 723                 remove(tmp_file.c_str());
 724                 return false;
 725         }
 726
 727         return true;
 728 }
 729
 730 bool extractZipFile(io::IFileSystem *fs, const char *filename, const std::string &destination)
 731 {
 732         if (!fs->addFileArchive(filename, false, false, io::EFAT_ZIP)) {
 733                 return false;
 734         }
 735
 736         sanity_check(fs->getFileArchiveCount() > 0);
 737
 738         /**********************************************************************/
 739         /* WARNING this is not threadsafe!!                                   */
 740         /**********************************************************************/
 741         io::IFileArchive* opened_zip = fs->getFileArchive(fs->getFileArchiveCount() - 1);
 742
 743         const io::IFileList* files_in_zip = opened_zip->getFileList();
 744
 745         unsigned int number_of_files = files_in_zip->getFileCount();
 746
 747         for (unsigned int i=0; i < number_of_files; i++) {
 748                 std::string fullpath = destination;
 749                 fullpath += DIR_DELIM;
 750                 fullpath += files_in_zip->getFullFileName(i).c_str();
 751                 std::string fullpath_dir = fs::RemoveLastPathComponent(fullpath);
 752
 753                 if (!files_in_zip->isDirectory(i)) {
 754                         if (!fs::PathExists(fullpath_dir) && !fs::CreateAllDirs(fullpath_dir)) {
 755                                 fs->removeFileArchive(fs->getFileArchiveCount()-1);
 756                                 return false;
 757                         }
 758
 759                         io::IReadFile* toread = opened_zip->createAndOpenFile(i);
 760
 761                         FILE *targetfile = fopen(fullpath.c_str(),"wb");
 762
 763                         if (targetfile == NULL) {
 764                                 fs->removeFileArchive(fs->getFileArchiveCount()-1);
 765                                 return false;
 766                         }
 767
 768                         char read_buffer[1024];
 769                         long total_read = 0;
 770
 771                         while (total_read < toread->getSize()) {
 772
 773                                 unsigned int bytes_read =
 774                                                 toread->read(read_buffer,sizeof(read_buffer));
 775                                 if ((bytes_read == 0 ) ||
 776                                         (fwrite(read_buffer, 1, bytes_read, targetfile) != bytes_read))
 777                                 {
 778                                         fclose(targetfile);
 779                                         fs->removeFileArchive(fs->getFileArchiveCount() - 1);
 780                                         return false;
 781                                 }
 782                                 total_read += bytes_read;
 783                         }
 784
 785                         fclose(targetfile);
 786                 }
 787
 788         }
 789
 790         fs->removeFileArchive(fs->getFileArchiveCount() - 1);
 791         return true;
 792 }
 793
 794 bool ReadFile(const std::string &path, std::string &out)
 795 {
 796         std::ifstream is(path, std::ios::binary | std::ios::ate);
 797         if (!is.good()) {
 798                 return false;
 799         }
 800
 801         auto size = is.tellg();
 802         out.resize(size);
 803         is.seekg(0);
 804         is.read(&out[0], size);
 805
 806         return true;
 807 }
 808
 809 bool Rename(const std::string &from, const std::string &to)
 810 {
 811         return rename(from.c_str(), to.c_str()) == 0;
 812 }
 813
 814 } // namespace fs
 815