Filesystem: Abstract handling of directory files (#3455)

* Rename SceKernelIovec to OrbisKernelIovec

Fixes the naming scheme to match the rest of the project.

* Type fixups

Noticed this while working on the actual thing this PR is about.

* More type fixups

* Update file_system.cpp

* Abstract directory handling

* Clang

* Directory fstat

* Fix dirent loading logic

* PfsDirectory size

Seemed to be hardcoded when I ran tests, so I've hardcoded it here.
Also fixed up the reclen-aligning logic based on hardware observations.

* GetDents cleanup

Bring back the bytes < 512 error return from before, as that's still something that can be checked for out here.
I've also swapped the file type stuff to run from a switch case, so that the check for invalid file type can be used as the default case

* Support reading directories

* getdents

For PfsDirectory, getdents behaves like read does on normal directories. Since dirents are stored internally with a different struct, this means getdents has to convert the dirents before returning data.
For NormalDirectory, getdents is identical to read, so it can just call read and set the basep output.

* Directory readv

* Directory preadv

Since the file mutex is locked before these calls, messing with dirents_index like this shouldn't cause any weird side effects.

* return ORBIS_OK instead of 0

to better align with our coding standards.

* Directory lseek

* Un-modify CMakePresets.json

I keep this modified locally for Linux, but accidentally pushed it.

* Clang

* Fix mac compile

* Potential windows compile fix?

* Filename fix

* Fix normal directory d_reclen

* Comment cleanup

* Remove unnecessary dirent conversion logic

On real hardware, the records are still returned with the same reclen, despite the change in structure.

* PfsDirectory dirents_index fixes

Some weird stuff happens once you reach eof on directories.
Thankfully, PfsDirectories are rather tame in this regard.

* Change comment

* Rewrite normal directory reads

The logic for these seems to behave like a normal file, so instead of tracking a dirents_index, keep an internal buffer representing the file contents, and copy that to output buffers as needed.

* Update pfs_directory.cpp

* Clang

* Fix normal dirents

When rewriting the code, I forgot to account for the increased reclen value for the last dirent in the buffer.

* PfsDirectory::lseek fixes

Based on some additional tests, it seems like lseek unconditionally returns dirents_index, not the actual file position.
Also fixed some bugs with the logic for calculating the proper offset when games do wonky things, and fixed a potential area where games could crash.

* Downgrade stat and fstat log to debug

These functions can get pretty spammy.

* PfsDirectory: Properly track if end of file is reached

Using the metric `dirents_index < directory_content_size` fails when `directory_content_size` is larger than the actual directory size we report.
Since, from what I can tell, PfsDirectories shouldn't ever report more than 0x10000 bytes for size, this change is necessary.

* Revert "PfsDirectory: Properly track if end of file is reached"

I need to do some hardware tests to see if all this excess logic is actually necessary.

* Fix PfsDirectory directory_size

Turns out, if your game has over 1000 files in a folder, it will actually cause the size to increase.

* Update copyright date

* Move devices and directories into file_sys

I've also updated the copyright dates on all these files.

* C++ style type casts

* Remove unnecessary memset

* Use a vector for the data buffer

Simplifies logic for freeing the buffer, based on review suggestions.

* Fix potential oob array access

* Change type casts in Create function

* Clang

* std::memcpy instead of memcpy

* NormalDirectory::lseek cleanup

* Create constants for directory alignment values.

* Use const wherever possible

* Includes cleanup

CMakeLists.txt

@@ -747,22 +747,28 @@ set(CORE src/core/aerolib/stubs.cpp
          src/core/aerolib/aerolib.h
          src/core/address_space.cpp
          src/core/address_space.h
-         src/core/devices/base_device.cpp
-         src/core/devices/base_device.h
-         src/core/devices/ioccom.h
-         src/core/devices/logger.cpp
-         src/core/devices/logger.h
-         src/core/devices/nop_device.h
-         src/core/devices/console_device.cpp
-         src/core/devices/console_device.h
-         src/core/devices/deci_tty6_device.cpp
-         src/core/devices/deci_tty6_device.h
-         src/core/devices/random_device.cpp
-         src/core/devices/random_device.h
-         src/core/devices/urandom_device.cpp
-         src/core/devices/urandom_device.h
-         src/core/devices/srandom_device.cpp
-         src/core/devices/srandom_device.h
+         src/core/file_sys/devices/base_device.cpp
+         src/core/file_sys/devices/base_device.h
+         src/core/file_sys/devices/ioccom.h
+         src/core/file_sys/devices/logger.cpp
+         src/core/file_sys/devices/logger.h
+         src/core/file_sys/devices/nop_device.h
+         src/core/file_sys/devices/console_device.cpp
+         src/core/file_sys/devices/console_device.h
+         src/core/file_sys/devices/deci_tty6_device.cpp
+         src/core/file_sys/devices/deci_tty6_device.h
+         src/core/file_sys/devices/random_device.cpp
+         src/core/file_sys/devices/random_device.h
+         src/core/file_sys/devices/urandom_device.cpp
+         src/core/file_sys/devices/urandom_device.h
+         src/core/file_sys/devices/srandom_device.cpp
+         src/core/file_sys/devices/srandom_device.h
+         src/core/file_sys/directories/base_directory.cpp
+         src/core/file_sys/directories/base_directory.h
+         src/core/file_sys/directories/normal_directory.cpp
+         src/core/file_sys/directories/normal_directory.h
+         src/core/file_sys/directories/pfs_directory.cpp
+         src/core/file_sys/directories/pfs_directory.h
          src/core/file_format/pfs.h
          src/core/file_format/psf.cpp
          src/core/file_format/psf.h