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Common: Make recursive FileUtil functions take a maximum recursion

Browse source 
Fixes #1115.

Also improves the performances of DiskArchive’s directory
implementation a lot, simply by not going through the entire tree
instead of just listing the first level files.

Thanks to JayRoxFox for rebasing this on current master!
This commit is contained in:
Emmanuel Gil Peyrot 2015-09-06 07:59:04 +01:00
parent 51ee2d2eb1
commit 8ab6f26c09
4 changed files with 43 additions and 30 deletions
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11
src/citra_qt/game_list.cpp
View file

@ -118,19 +118,20 @@ void GameList::LoadInterfaceLayout()
item_model->sort(header->sortIndicatorSection(), header->sortIndicatorOrder());
}
void GameListWorker::AddFstEntriesToGameList(const std::string& dir_path, bool deep_scan)
void GameListWorker::AddFstEntriesToGameList(const std::string& dir_path, unsigned int recursion)
{
const auto callback = [&](unsigned* num_entries_out,
const std::string& directory,
const std::string& virtual_name) -> bool {
const std::string& virtual_name,
unsigned int recursion) -> bool {
std::string physical_name = directory + DIR_SEP + virtual_name;
if (stop_processing)
return false; // Breaks the callback loop.
if (deep_scan && FileUtil::IsDirectory(physical_name)) {
AddFstEntriesToGameList(physical_name, true);
if (recursion > 0 && FileUtil::IsDirectory(physical_name)) {
AddFstEntriesToGameList(physical_name, recursion - 1);
} else {
std::string filename_filename, filename_extension;
Common::SplitPath(physical_name, nullptr, &filename_filename, &filename_extension);
@ -169,7 +170,7 @@ void GameListWorker::AddFstEntriesToGameList(const std::string& dir_path, bool d
void GameListWorker::run()
{
stop_processing = false;
AddFstEntriesToGameList(dir_path.toStdString(), deep_scan);
AddFstEntriesToGameList(dir_path.toStdString(), deep_scan ? 256 : 0);
emit Finished();
}

2
src/citra_qt/game_list_p.h
View file

@ -212,5 +212,5 @@ private:
bool deep_scan;
std::atomic_bool stop_processing;
void AddFstEntriesToGameList(const std::string& dir_path, bool deep_scan);
void AddFstEntriesToGameList(const std::string& dir_path, unsigned int recursion = 0);
};

48
src/common/file_util.cpp
View file

@ -434,7 +434,7 @@ bool CreateEmptyFile(const std::string &filename)
}
bool ForeachDirectoryEntry(unsigned* num_entries_out, const std::string &directory, DirectoryEntryCallable callback)
bool ForeachDirectoryEntry(unsigned* num_entries_out, const std::string &directory, DirectoryEntryCallable callback, unsigned int recursion)
{
LOG_TRACE(Common_Filesystem, "directory %s", directory.c_str());
@ -472,7 +472,7 @@ bool ForeachDirectoryEntry(unsigned* num_entries_out, const std::string &directo
continue;
unsigned ret_entries = 0;
if (!callback(&ret_entries, directory, virtual_name)) {
if (!callback(&ret_entries, directory, virtual_name, recursion)) {
callback_error = true;
break;
}
@ -486,30 +486,34 @@ bool ForeachDirectoryEntry(unsigned* num_entries_out, const std::string &directo
closedir(dirp);
#endif
if (!callback_error) {
// num_entries_out is allowed to be specified nullptr, in which case we shouldn't try to set it
if (num_entries_out != nullptr)
*num_entries_out = found_entries;
return true;
} else {
if (callback_error)
return false;
}
// num_entries_out is allowed to be specified nullptr, in which case we shouldn't try to set it
if (num_entries_out != nullptr)
*num_entries_out = found_entries;
return true;
}
unsigned ScanDirectoryTree(const std::string &directory, FSTEntry& parent_entry)
unsigned ScanDirectoryTree(const std::string &directory, FSTEntry& parent_entry, unsigned int recursion)
{
const auto callback = [&parent_entry](unsigned* num_entries_out,
const std::string& directory,
const std::string& virtual_name) -> bool {
const std::string& virtual_name,
unsigned int recursion) -> bool {
FSTEntry entry;
entry.virtualName = virtual_name;
entry.physicalName = directory + DIR_SEP + virtual_name;
if (IsDirectory(entry.physicalName)) {
entry.isDirectory = true;
// is a directory, lets go inside
entry.size = ScanDirectoryTree(entry.physicalName, entry);
*num_entries_out += (int)entry.size;
// is a directory, lets go inside if we didn't recurse to often
if (recursion > 0) {
entry.size = ScanDirectoryTree(entry.physicalName, entry, recursion - 1);
*num_entries_out += (int)entry.size;
} else {
entry.size = 0;
}
} else { // is a file
entry.isDirectory = false;
entry.size = GetSize(entry.physicalName);
@ -522,23 +526,27 @@ unsigned ScanDirectoryTree(const std::string &directory, FSTEntry& parent_entry)
};
unsigned num_entries;
return ForeachDirectoryEntry(&num_entries, directory, callback) ? num_entries : 0;
return ForeachDirectoryEntry(&num_entries, directory, callback, recursion) ? num_entries : 0;
}
bool DeleteDirRecursively(const std::string &directory)
bool DeleteDirRecursively(const std::string &directory, unsigned int recursion)
{
const static auto callback = [](unsigned* num_entries_out,
const std::string& directory,
const std::string& virtual_name) -> bool {
const std::string& virtual_name,
unsigned int recursion) -> bool {
std::string new_path = directory + DIR_SEP_CHR + virtual_name;
if (IsDirectory(new_path))
return DeleteDirRecursively(new_path);
if (IsDirectory(new_path)) {
if (recursion == 0)
return false;
return DeleteDirRecursively(new_path, recursion - 1);
}
return Delete(new_path);
};
if (!ForeachDirectoryEntry(nullptr, directory, callback))
if (!ForeachDirectoryEntry(nullptr, directory, callback, recursion))
return false;
// Delete the outermost directory

12
src/common/file_util.h
View file

@ -105,11 +105,13 @@ bool CreateEmptyFile(const std::string &filename);
* @param num_entries_out to be assigned by the callable with the number of iterated directory entries, never null
* @param directory the path to the enclosing directory
* @param virtual_name the entry name, without any preceding directory info
* @param recursion Number of children directory to read before giving up
* @return whether handling the entry succeeded
*/
using DirectoryEntryCallable = std::function<bool(unsigned* num_entries_out,
const std::string& directory,
const std::string& virtual_name)>;
const std::string& virtual_name,
unsigned int recursion)>;
/**
* Scans a directory, calling the callback for each file/directory contained within.
@ -117,20 +119,22 @@ using DirectoryEntryCallable = std::function<bool(unsigned* num_entries_out,
* @param num_entries_out assigned by the function with the number of iterated directory entries, can be null
* @param directory the directory to scan
* @param callback The callback which will be called for each entry
* @param recursion Number of children directories to read before giving up
* @return whether scanning the directory succeeded
*/
bool ForeachDirectoryEntry(unsigned* num_entries_out, const std::string &directory, DirectoryEntryCallable callback);
bool ForeachDirectoryEntry(unsigned* num_entries_out, const std::string &directory, DirectoryEntryCallable callback, unsigned int recursion = 0);
/**
* Scans the directory tree, storing the results.
* @param directory the parent directory to start scanning from
* @param parent_entry FSTEntry where the filesystem tree results will be stored.
* @param recursion Number of children directories to read before giving up.
* @return the total number of files/directories found
*/
unsigned ScanDirectoryTree(const std::string &directory, FSTEntry& parent_entry);
unsigned ScanDirectoryTree(const std::string &directory, FSTEntry& parent_entry, unsigned int recursion = 0);
// deletes the given directory and anything under it. Returns true on success.
bool DeleteDirRecursively(const std::string &directory);
bool DeleteDirRecursively(const std::string &directory, unsigned int recursion = 256);
// Returns the current directory
std::string GetCurrentDir();