It's undefined behavior to pass a null pointer to std::fread and
std::fwrite, even if the length passed in is zero, so we must perform
the precondition checking ourselves.
A common case where this can occur is when passing in the data of an
empty std::vector and size, as an empty vector will typically have a
null internal buffer.
While we're at it, we can move the implementation out of line and add
debug checks against passing in nullptr to std::fread and std::fwrite.
On Windows, network shares use paths like \\server\share\file which were
being broken by FileUtil::SanitizePath() removing double slashes.
Changed the code in SanitizePath to permit a double-backslash if it
occurs at the start of a filepath (on Windows only).
* IOFile: Make the move constructor and move assignment operator noexcept
Certain parts of the standard library try to determine whether or not a
transfer operation should either be a copy or a move. The prevalent notion
of move constructors/assignment operators is that they should not throw,
they simply move an already existing resource somewhere else.
This is typically done with 'std::move_if_noexcept'. Like the name says,
if a type's move constructor is noexcept, then the functions retrieves an
r-value reference (for move semantics), or an l-value (for copy semantics)
if it is not noexcept.
As IOFile deletes the copy constructor and copy assignment operators,
using IOFile with certain parts of the standard library can fail in
unexcepted ways (especially when used with various container
implementations). This prevents that.
* fix various instances of -1 being assigned to unsigned types
* do not assign in conditional statements
* File/IOFile: Check _tfopen_s properly
* common/file_util.cpp: address review comments
Co-authored-by: Lioncash <mathew1800@gmail.com>
Co-authored-by: Shawn Hoffman <godisgovernment@gmail.com>
Co-authored-by: Sepalani <sepalani@hotmail.fr>
nullptr was being returned in the error case, which, at a glance may
seem perfectly OK... until you realize that std::string has the
invariant that it may not be constructed from a null pointer. This
means that if this error case was ever hit, then the application would
most likely crash from a thrown exception in std::string's constructor.
Instead, we can change the function to return an optional value,
indicating if a failure occurred.
Makes the parameter ordering consistent, and also makes the filename
parameter a std::string. A std::string would be constructed anyways with
the previous code, as IOFile's only constructor with a filepath is one
taking a std::string.
We can also make WriteStringToFile's string parameter utilize a
std::string_view for the string, making use of our previous changes to
IOFile.
We can just leverage std::unique_ptr to automatically close these for us
in error cases instead of jumping to the end of the function to call
fclose on them.
Instead of using an unsigned int as a parameter and expecting a user to
always pass in the correct values, we can just convert the enum into an
enum class and use that type as the parameter type instead, which makes
the interface more type safe.
We also get rid of the bookkeeping "NUM_" element in the enum by just
using an unordered map. This function is generally low-frequency in
terms of calls (and I'd hope so, considering otherwise would mean we're
slamming the disk with IO all the time) so I'd consider this acceptable
in this case.
* Add VfsFile and VfsDirectory classes
* Finish abstract Vfs classes
* Implement RealVfsFile (computer fs backend)
* Finish RealVfsFile and RealVfsDirectory
* Finished OffsetVfsFile
* More changes
* Fix import paths
* Major refactor
* Remove double const
* Use experimental/filesystem or filesystem depending on compiler
* Port partition_filesystem
* More changes
* More Overhaul
* FSP_SRV fixes
* Fixes and testing
* Try to get filesystem to compile
* Filesystem on linux
* Remove std::filesystem and document/test
* Compile fixes
* Missing include
* Bug fixes
* Fixes
* Rename v_file and v_dir
* clang-format fix
* Rename NGLOG_* to LOG_*
* Most review changes
* Fix TODO
* Guess 'main' to be Directory by filename
Without this, it's possible to get compilation failures in the (rare) scenario where
a container is used to store a bunch of live IOFile instances, as they may be using
std::move_if_noexcept under the hood. Given these definitely don't throw exceptions
this is also not incorrect to add either.
