ftpiiu_plugin/source/IOAbstraction.cpp
2024-03-08 17:34:11 +01:00

198 lines
4.6 KiB
C++

#include "IOAbstraction.h"
#include <algorithm>
#include <map>
#include <memory>
#include <sys/dirent.h>
#include <vector>
class VirtualDirectory
{
public:
VirtualDirectory (const std::vector<std::string> &directories)
{
mDirectories.push_back (".");
mDirectories.push_back ("..");
mDirectories.insert (mDirectories.end (), directories.begin (), directories.end ());
mCurIterator = mDirectories.begin ();
}
[[nodiscard]] DIR *getAsDir () const
{
return (DIR *)this;
}
struct dirent *readdir ()
{
if (mCurIterator == mDirectories.end ())
{
return nullptr;
}
mDir = {};
snprintf (mDir.d_name, sizeof (mDir.d_name), "%s", mCurIterator->c_str ());
mCurIterator++;
return &mDir;
}
private:
std::vector<std::string> mDirectories;
struct dirent mDir = {};
std::vector<std::string>::iterator mCurIterator{};
};
std::vector<std::unique_ptr<VirtualDirectory>> sOpenVirtualDirectories;
std::mutex sOpenVirtualDirectoriesMutex;
std::map<std::string, std::vector<std::string>> sVirtualDirs;
template <typename Container, typename Predicate>
typename std::enable_if<std::is_same<Container, std::vector<typename Container::value_type>>::value,
bool>::type
remove_first_if (Container &container, Predicate pred)
{
auto it = container.begin ();
while (it != container.end ())
{
if (pred (*it))
{
container.erase (it);
return true;
}
++it;
}
return false;
}
template <typename Container, typename Predicate>
bool remove_locked_first_if (std::mutex &mutex, Container &container, Predicate pred)
{
std::lock_guard<std::mutex> lock (mutex);
return remove_first_if (container, pred);
}
static DIR *getVirtualDir (const std::vector<std::string> &subDirectories)
{
auto virtDir = std::make_unique<VirtualDirectory> (subDirectories);
auto *result = virtDir->getAsDir ();
std::lock_guard lock (sOpenVirtualDirectoriesMutex);
sOpenVirtualDirectories.push_back (std::move (virtDir));
return result;
}
std::string IOAbstraction::convertPath (std::string_view inPath)
{
#ifdef __WIIU__
if (!inPath.starts_with ('/') || inPath.find (':') != std::string::npos)
{
return std::string (inPath);
}
std::string path = std::string (inPath);
size_t secondSlashPos = path.find ('/', 1);
if (secondSlashPos != std::string::npos)
{
// Extract the substring between the first and second slashes
std::string prefix = path.substr (1, secondSlashPos - 1);
std::string suffix = path.substr (secondSlashPos);
// Concatenate the modified prefix and suffix
path = prefix + ":" + suffix;
}
else
{
path = std::string (inPath.substr (1)) + ":/";
}
return path;
#else
return std::string (inPath);
#endif
}
int IOAbstraction::closedir (DIR *dirp)
{
{
std::lock_guard lock (sOpenVirtualDirectoriesMutex);
if (remove_locked_first_if (sOpenVirtualDirectoriesMutex,
sOpenVirtualDirectories,
[dirp] (auto &cur) { return cur->getAsDir () == dirp; }))
{
return 0;
}
}
return ::closedir (dirp);
}
DIR *IOAbstraction::opendir (const char *dirname)
{
auto convertedPath = convertPath (dirname);
if (sVirtualDirs.count (convertedPath) > 0)
{
return getVirtualDir (sVirtualDirs[convertedPath]);
}
return ::opendir (convertedPath.c_str ());
}
FILE *IOAbstraction::fopen (const char *_name, const char *_type)
{
return std::fopen (convertPath (_name).c_str (), _type);
}
int IOAbstraction::fseek (FILE *f, long pos, int origin)
{
return std::fseek (f, pos, origin);
}
size_t IOAbstraction::fread (void *buffer, size_t _size, size_t _n, FILE *f)
{
return std::fread (buffer, _size, _n, f);
}
size_t IOAbstraction::fwrite (const void *buffer, size_t _size, size_t _n, FILE *f)
{
return std::fwrite (buffer, _size, _n, f);
}
struct dirent *IOAbstraction::readdir (DIR *dirp)
{
{
std::lock_guard lock (sOpenVirtualDirectoriesMutex);
auto itr = std::find_if (sOpenVirtualDirectories.begin (),
sOpenVirtualDirectories.end (),
[dirp] (auto &cur) { return cur->getAsDir () == dirp; });
if (itr != sOpenVirtualDirectories.end ())
{
return (*itr)->readdir ();
}
}
return ::readdir (dirp);
}
int IOAbstraction::stat (const char *path, struct stat *sbuf)
{
auto convertedPath = convertPath (path);
auto r = ::stat (convertedPath.c_str (), sbuf);
if (r < 0)
{
if (sVirtualDirs.contains (convertedPath))
{
*sbuf = {};
// TODO: init other values?
sbuf->st_mode = _IFDIR;
return 0;
}
}
return r;
}
int IOAbstraction::lstat (const char *path, struct stat *buf)
{
return IOAbstraction::stat (path, buf);
}
void IOAbstraction::addVirtualPath (const std::string &virtualPath,
const std::vector<std::string> &subDirectories)
{
sVirtualDirs.insert (std::make_pair (virtualPath, subDirectories));
}