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      1 /*
      2  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
      3  *
      4  *  Use of this source code is governed by a BSD-style license
      5  *  that can be found in the LICENSE file in the root of the source
      6  *  tree. An additional intellectual property rights grant can be found
      7  *  in the file PATENTS.  All contributing project authors may
      8  *  be found in the AUTHORS file in the root of the source tree.
      9  */
     10 
     11 #include <assert.h>
     12 
     13 #include "webrtc/base/arraysize.h"
     14 #include "webrtc/base/pathutils.h"
     15 #include "webrtc/base/fileutils.h"
     16 #include "webrtc/base/stringutils.h"
     17 #include "webrtc/base/stream.h"
     18 
     19 #if defined(WEBRTC_WIN)
     20 #include "webrtc/base/win32filesystem.h"
     21 #else
     22 #include "webrtc/base/unixfilesystem.h"
     23 #endif
     24 
     25 #if !defined(WEBRTC_WIN)
     26 #define MAX_PATH 260
     27 #endif
     28 
     29 namespace rtc {
     30 
     31 //////////////////////////
     32 // Directory Iterator   //
     33 //////////////////////////
     34 
     35 // A DirectoryIterator is created with a given directory. It originally points
     36 // to the first file in the directory, and can be advanecd with Next(). This
     37 // allows you to get information about each file.
     38 
     39   // Constructor
     40 DirectoryIterator::DirectoryIterator()
     41 #ifdef WEBRTC_WIN
     42     : handle_(INVALID_HANDLE_VALUE) {
     43 #else
     44     : dir_(NULL), dirent_(NULL) {
     45 #endif
     46 }
     47 
     48   // Destructor
     49 DirectoryIterator::~DirectoryIterator() {
     50 #if defined(WEBRTC_WIN)
     51   if (handle_ != INVALID_HANDLE_VALUE)
     52     ::FindClose(handle_);
     53 #else
     54   if (dir_)
     55     closedir(dir_);
     56 #endif
     57 }
     58 
     59   // Starts traversing a directory.
     60   // dir is the directory to traverse
     61   // returns true if the directory exists and is valid
     62 bool DirectoryIterator::Iterate(const Pathname &dir) {
     63   directory_ = dir.pathname();
     64 #if defined(WEBRTC_WIN)
     65   if (handle_ != INVALID_HANDLE_VALUE)
     66     ::FindClose(handle_);
     67   std::string d = dir.pathname() + '*';
     68   handle_ = ::FindFirstFile(ToUtf16(d).c_str(), &data_);
     69   if (handle_ == INVALID_HANDLE_VALUE)
     70     return false;
     71 #else
     72   if (dir_ != NULL)
     73     closedir(dir_);
     74   dir_ = ::opendir(directory_.c_str());
     75   if (dir_ == NULL)
     76     return false;
     77   dirent_ = readdir(dir_);
     78   if (dirent_ == NULL)
     79     return false;
     80 
     81   if (::stat(std::string(directory_ + Name()).c_str(), &stat_) != 0)
     82     return false;
     83 #endif
     84   return true;
     85 }
     86 
     87   // Advances to the next file
     88   // returns true if there were more files in the directory.
     89 bool DirectoryIterator::Next() {
     90 #if defined(WEBRTC_WIN)
     91   return ::FindNextFile(handle_, &data_) == TRUE;
     92 #else
     93   dirent_ = ::readdir(dir_);
     94   if (dirent_ == NULL)
     95     return false;
     96 
     97   return ::stat(std::string(directory_ + Name()).c_str(), &stat_) == 0;
     98 #endif
     99 }
    100 
    101   // returns true if the file currently pointed to is a directory
    102 bool DirectoryIterator::IsDirectory() const {
    103 #if defined(WEBRTC_WIN)
    104   return (data_.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != FALSE;
    105 #else
    106   return S_ISDIR(stat_.st_mode);
    107 #endif
    108 }
    109 
    110   // returns the name of the file currently pointed to
    111 std::string DirectoryIterator::Name() const {
    112 #if defined(WEBRTC_WIN)
    113   return ToUtf8(data_.cFileName);
    114 #else
    115   assert(dirent_ != NULL);
    116   return dirent_->d_name;
    117 #endif
    118 }
    119 
    120   // returns the size of the file currently pointed to
    121 size_t DirectoryIterator::FileSize() const {
    122 #if !defined(WEBRTC_WIN)
    123   return stat_.st_size;
    124 #else
    125   return data_.nFileSizeLow;
    126 #endif
    127 }
    128 
    129 bool DirectoryIterator::OlderThan(int seconds) const {
    130   time_t file_modify_time;
    131 #if defined(WEBRTC_WIN)
    132   FileTimeToUnixTime(data_.ftLastWriteTime, &file_modify_time);
    133 #else
    134   file_modify_time = stat_.st_mtime;
    135 #endif
    136   return TimeDiff(time(NULL), file_modify_time) >= seconds;
    137 }
    138 
    139 FilesystemInterface* Filesystem::default_filesystem_ = NULL;
    140 
    141 FilesystemInterface *Filesystem::EnsureDefaultFilesystem() {
    142   if (!default_filesystem_) {
    143 #if defined(WEBRTC_WIN)
    144     default_filesystem_ = new Win32Filesystem();
    145 #else
    146     default_filesystem_ = new UnixFilesystem();
    147 #endif
    148   }
    149   return default_filesystem_;
    150 }
    151 
    152 DirectoryIterator* FilesystemInterface::IterateDirectory() {
    153   return new DirectoryIterator();
    154 }
    155 
    156 bool FilesystemInterface::CopyFolder(const Pathname &old_path,
    157                                      const Pathname &new_path) {
    158   bool success = true;
    159   VERIFY(IsFolder(old_path));
    160   Pathname new_dir;
    161   new_dir.SetFolder(new_path.pathname());
    162   Pathname old_dir;
    163   old_dir.SetFolder(old_path.pathname());
    164   if (!CreateFolder(new_dir))
    165     return false;
    166   DirectoryIterator *di = IterateDirectory();
    167   if (!di)
    168     return false;
    169   if (di->Iterate(old_dir.pathname())) {
    170     do {
    171       if (di->Name() == "." || di->Name() == "..")
    172         continue;
    173       Pathname source;
    174       Pathname dest;
    175       source.SetFolder(old_dir.pathname());
    176       dest.SetFolder(new_path.pathname());
    177       source.SetFilename(di->Name());
    178       dest.SetFilename(di->Name());
    179       if (!CopyFileOrFolder(source, dest))
    180         success = false;
    181     } while (di->Next());
    182   }
    183   delete di;
    184   return success;
    185 }
    186 
    187 bool FilesystemInterface::DeleteFolderContents(const Pathname &folder) {
    188   bool success = true;
    189   VERIFY(IsFolder(folder));
    190   DirectoryIterator *di = IterateDirectory();
    191   if (!di)
    192     return false;
    193   if (di->Iterate(folder)) {
    194     do {
    195       if (di->Name() == "." || di->Name() == "..")
    196         continue;
    197       Pathname subdir;
    198       subdir.SetFolder(folder.pathname());
    199       if (di->IsDirectory()) {
    200         subdir.AppendFolder(di->Name());
    201         if (!DeleteFolderAndContents(subdir)) {
    202           success = false;
    203         }
    204       } else {
    205         subdir.SetFilename(di->Name());
    206         if (!DeleteFile(subdir)) {
    207           success = false;
    208         }
    209       }
    210     } while (di->Next());
    211   }
    212   delete di;
    213   return success;
    214 }
    215 
    216 bool FilesystemInterface::DeleteFolderAndContents(const Pathname& folder) {
    217   return DeleteFolderContents(folder) && DeleteEmptyFolder(folder);
    218 }
    219 
    220 bool FilesystemInterface::CleanAppTempFolder() {
    221   Pathname path;
    222   if (!GetAppTempFolder(&path))
    223     return false;
    224   if (IsAbsent(path))
    225     return true;
    226   if (!IsTemporaryPath(path)) {
    227     ASSERT(false);
    228     return false;
    229   }
    230   return DeleteFolderContents(path);
    231 }
    232 
    233 Pathname Filesystem::GetCurrentDirectory() {
    234   return EnsureDefaultFilesystem()->GetCurrentDirectory();
    235 }
    236 
    237 bool CreateUniqueFile(Pathname& path, bool create_empty) {
    238   LOG(LS_INFO) << "Path " << path.pathname() << std::endl;
    239   // If no folder is supplied, use the temporary folder
    240   if (path.folder().empty()) {
    241     Pathname temporary_path;
    242     if (!Filesystem::GetTemporaryFolder(temporary_path, true, NULL)) {
    243       printf("Get temp failed\n");
    244       return false;
    245     }
    246     path.SetFolder(temporary_path.pathname());
    247   }
    248 
    249   // If no filename is supplied, use a temporary name
    250   if (path.filename().empty()) {
    251     std::string folder(path.folder());
    252     std::string filename = Filesystem::TempFilename(folder, "gt");
    253     path.SetPathname(filename);
    254     if (!create_empty) {
    255       Filesystem::DeleteFile(path.pathname());
    256     }
    257     return true;
    258   }
    259 
    260   // Otherwise, create a unique name based on the given filename
    261   // foo.txt -> foo-N.txt
    262   const std::string basename = path.basename();
    263   const size_t MAX_VERSION = 100;
    264   size_t version = 0;
    265   while (version < MAX_VERSION) {
    266     std::string pathname = path.pathname();
    267 
    268     if (!Filesystem::IsFile(pathname)) {
    269       if (create_empty) {
    270         FileStream* fs = Filesystem::OpenFile(pathname, "w");
    271         delete fs;
    272       }
    273       return true;
    274     }
    275     version += 1;
    276     char version_base[MAX_PATH];
    277     sprintfn(version_base, arraysize(version_base), "%s-%u", basename.c_str(),
    278              version);
    279     path.SetBasename(version_base);
    280   }
    281   return true;
    282 }
    283 
    284 }  // namespace rtc
    285