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      1 /*
      2  * libjingle
      3  * Copyright 2004--2006, Google Inc.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are met:
      7  *
      8  *  1. Redistributions of source code must retain the above copyright notice,
      9  *     this list of conditions and the following disclaimer.
     10  *  2. Redistributions in binary form must reproduce the above copyright notice,
     11  *     this list of conditions and the following disclaimer in the documentation
     12  *     and/or other materials provided with the distribution.
     13  *  3. The name of the author may not be used to endorse or promote products
     14  *     derived from this software without specific prior written permission.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
     17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     18  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
     19  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     20  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #include <cassert>
     29 
     30 #ifdef WIN32
     31 #include "talk/base/win32.h"
     32 #endif
     33 
     34 #include "talk/base/pathutils.h"
     35 #include "talk/base/fileutils.h"
     36 #include "talk/base/stringutils.h"
     37 #include "talk/base/stream.h"
     38 
     39 #ifdef WIN32
     40 #include "talk/base/win32filesystem.h"
     41 #else
     42 #include "talk/base/unixfilesystem.h"
     43 #endif
     44 
     45 #ifndef WIN32
     46 #define MAX_PATH 260
     47 #endif
     48 
     49 namespace talk_base {
     50 
     51 //////////////////////////
     52 // Directory Iterator   //
     53 //////////////////////////
     54 
     55 // A DirectoryIterator is created with a given directory. It originally points
     56 // to the first file in the directory, and can be advanecd with Next(). This
     57 // allows you to get information about each file.
     58 
     59   // Constructor
     60 DirectoryIterator::DirectoryIterator()
     61 #ifdef _WIN32
     62     : handle_(INVALID_HANDLE_VALUE) {
     63 #else
     64     : dir_(NULL), dirent_(NULL) {
     65 #endif
     66 }
     67 
     68   // Destructor
     69 DirectoryIterator::~DirectoryIterator() {
     70 #ifdef WIN32
     71   if (handle_ != INVALID_HANDLE_VALUE)
     72     ::FindClose(handle_);
     73 #else
     74   if (dir_)
     75     closedir(dir_);
     76 #endif
     77 }
     78 
     79   // Starts traversing a directory.
     80   // dir is the directory to traverse
     81   // returns true if the directory exists and is valid
     82 bool DirectoryIterator::Iterate(const Pathname &dir) {
     83   directory_ = dir.pathname();
     84 #ifdef WIN32
     85   if (handle_ != INVALID_HANDLE_VALUE)
     86     ::FindClose(handle_);
     87   std::string d = dir.pathname() + '*';
     88   handle_ = ::FindFirstFile(ToUtf16(d).c_str(), &data_);
     89   if (handle_ == INVALID_HANDLE_VALUE)
     90     return false;
     91 #else
     92   if (dir_ != NULL)
     93     closedir(dir_);
     94   dir_ = ::opendir(directory_.c_str());
     95   if (dir_ == NULL)
     96     return false;
     97   dirent_ = readdir(dir_);
     98   if (dirent_ == NULL)
     99     return false;
    100 
    101   if (::stat(std::string(directory_ + Name()).c_str(), &stat_) != 0)
    102     return false;
    103 #endif
    104   return true;
    105 }
    106 
    107   // Advances to the next file
    108   // returns true if there were more files in the directory.
    109 bool DirectoryIterator::Next() {
    110 #ifdef WIN32
    111   return ::FindNextFile(handle_, &data_) == TRUE;
    112 #else
    113   dirent_ = ::readdir(dir_);
    114   if (dirent_ == NULL)
    115     return false;
    116 
    117   return ::stat(std::string(directory_ + Name()).c_str(), &stat_) == 0;
    118 #endif
    119 }
    120 
    121   // returns true if the file currently pointed to is a directory
    122 bool DirectoryIterator::IsDirectory() const {
    123 #ifdef WIN32
    124   return (data_.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) != FALSE;
    125 #else
    126   return S_ISDIR(stat_.st_mode);
    127 #endif
    128 }
    129 
    130   // returns the name of the file currently pointed to
    131 std::string DirectoryIterator::Name() const {
    132 #ifdef WIN32
    133   return ToUtf8(data_.cFileName);
    134 #else
    135   assert(dirent_ != NULL);
    136   return dirent_->d_name;
    137 #endif
    138 }
    139 
    140   // returns the size of the file currently pointed to
    141 size_t DirectoryIterator::FileSize() const {
    142 #ifndef WIN32
    143   return stat_.st_size;
    144 #else
    145   return data_.nFileSizeLow;
    146 #endif
    147 }
    148 
    149   // returns the last modified time of this file
    150 time_t DirectoryIterator::FileModifyTime() const {
    151 #ifdef WIN32
    152   time_t val;
    153   FileTimeToUnixTime(data_.ftLastWriteTime, &val);
    154   return val;
    155 #else
    156   return stat_.st_mtime;
    157 #endif
    158 }
    159 
    160 FilesystemInterface* Filesystem::default_filesystem_ = NULL;
    161 
    162 FilesystemInterface *Filesystem::EnsureDefaultFilesystem() {
    163   if (!default_filesystem_) {
    164 #ifdef WIN32
    165     default_filesystem_ = new Win32Filesystem();
    166 #else
    167     default_filesystem_ = new UnixFilesystem();
    168 #endif
    169   }
    170   return default_filesystem_;
    171 }
    172 
    173 bool FilesystemInterface::CopyFolder(const Pathname &old_path,
    174                                      const Pathname &new_path) {
    175   bool success = true;
    176   VERIFY(IsFolder(old_path));
    177   Pathname new_dir;
    178   new_dir.SetFolder(new_path.pathname());
    179   Pathname old_dir;
    180   old_dir.SetFolder(old_path.pathname());
    181   if (!CreateFolder(new_dir))
    182     return false;
    183   DirectoryIterator *di = IterateDirectory();
    184   if (!di)
    185     return false;
    186   if (di->Iterate(old_dir.pathname())) {
    187     do {
    188       if (di->Name() == "." || di->Name() == "..")
    189         continue;
    190       Pathname source;
    191       Pathname dest;
    192       source.SetFolder(old_dir.pathname());
    193       dest.SetFolder(new_path.pathname());
    194       source.SetFilename(di->Name());
    195       dest.SetFilename(di->Name());
    196       if (!CopyFileOrFolder(source, dest))
    197         success = false;
    198     } while (di->Next());
    199   }
    200   delete di;
    201   return success;
    202 }
    203 
    204 bool FilesystemInterface::DeleteFolderContents(const Pathname &folder) {
    205   bool success = true;
    206   VERIFY(IsFolder(folder));
    207   DirectoryIterator *di = IterateDirectory();
    208   if (!di)
    209     return false;
    210   if (di->Iterate(folder)) {
    211     do {
    212       if (di->Name() == "." || di->Name() == "..")
    213         continue;
    214       Pathname subdir;
    215       subdir.SetFolder(folder.pathname());
    216       if (di->IsDirectory()) {
    217         subdir.AppendFolder(di->Name());
    218         if (!DeleteFolderAndContents(subdir)) {
    219           success = false;
    220         }
    221       } else {
    222         subdir.SetFilename(di->Name());
    223         if (!DeleteFile(subdir)) {
    224           success = false;
    225         }
    226       }
    227     } while (di->Next());
    228   }
    229   delete di;
    230   return success;
    231 }
    232 
    233 bool FilesystemInterface::CleanAppTempFolder() {
    234   Pathname path;
    235   if (!GetAppTempFolder(&path))
    236     return false;
    237   if (IsAbsent(path))
    238     return true;
    239   if (!IsTemporaryPath(path)) {
    240     ASSERT(false);
    241     return false;
    242   }
    243   return DeleteFolderContents(path);
    244 }
    245 
    246 Pathname Filesystem::GetCurrentDirectory() {
    247   return EnsureDefaultFilesystem()->GetCurrentDirectory();
    248 }
    249 
    250 bool CreateUniqueFile(Pathname& path, bool create_empty) {
    251   LOG(LS_INFO) << "Path " << path.pathname() << std::endl;
    252   // If no folder is supplied, use the temporary folder
    253   if (path.folder().empty()) {
    254     Pathname temporary_path;
    255     if (!Filesystem::GetTemporaryFolder(temporary_path, true, NULL)) {
    256       printf("Get temp failed\n");
    257       return false;
    258     }
    259     path.SetFolder(temporary_path.pathname());
    260   }
    261 
    262   // If no filename is supplied, use a temporary name
    263   if (path.filename().empty()) {
    264     std::string folder(path.folder());
    265     std::string filename = Filesystem::TempFilename(folder, "gt");
    266     path.SetPathname(filename);
    267     if (!create_empty) {
    268       Filesystem::DeleteFile(path.pathname());
    269     }
    270     return true;
    271   }
    272 
    273   // Otherwise, create a unique name based on the given filename
    274   // foo.txt -> foo-N.txt
    275   const std::string basename = path.basename();
    276   const size_t MAX_VERSION = 100;
    277   size_t version = 0;
    278   while (version < MAX_VERSION) {
    279     std::string pathname = path.pathname();
    280 
    281     if (!Filesystem::IsFile(pathname)) {
    282       if (create_empty) {
    283         FileStream* fs = Filesystem::OpenFile(pathname, "w");
    284         delete fs;
    285       }
    286       return true;
    287     }
    288     version += 1;
    289     char version_base[MAX_PATH];
    290     sprintfn(version_base, ARRAY_SIZE(version_base), "%s-%u",
    291              basename.c_str(), version);
    292     path.SetBasename(version_base);
    293   }
    294   return true;
    295 }
    296 
    297 }  // namespace talk_base
    298