Inheritance diagram for VFS:

Collaboration diagram for VFS:

Public Member Functions
	VFS (size_t cacheSize)

virtual Status	Mount (const VfsPath &mountPoint, const OsPath &path, size_t flags, size_t priority)
	mount a directory into the VFS. More...

virtual Status	GetFileInfo (const VfsPath &pathname, CFileInfo *pfileInfo) const
	Retrieve information about a file (similar to POSIX stat). More...

virtual Status	GetFilePriority (const VfsPath &pathname, size_t *ppriority) const
	Retrieve mount priority for a file. More...

virtual Status	GetDirectoryEntries (const VfsPath &path, CFileInfos fileInfos, DirectoryNames subdirectoryNames) const
	Retrieve lists of all files and subdirectories in a directory. More...

virtual Status	CreateFile (const VfsPath &pathname, const shared_ptr< u8 > &fileContents, size_t size)
	Create a file with the given contents. More...

virtual Status	ReplaceFile (const VfsPath &pathname, const shared_ptr< u8 > &fileContents, size_t size)
	Replace a file with the given contents. More...

virtual Status	LoadFile (const VfsPath &pathname, shared_ptr< u8 > &fileContents, size_t &size)
	Read an entire file into memory. More...

virtual std::wstring	TextRepresentation () const

virtual Status	GetRealPath (const VfsPath &pathname, OsPath &realPathname)
	retrieve the real (POSIX) pathname underlying a VFS file. More...

virtual Status	GetDirectoryRealPath (const VfsPath &pathname, OsPath &realPathname)
	retrieve the real (POSIX) pathname underlying a VFS directory. More...

virtual Status	GetVirtualPath (const OsPath &realPathname, VfsPath &pathname)
	retrieve the VFS pathname that corresponds to a real file. More...

virtual Status	RemoveFile (const VfsPath &pathname)
	remove file from the virtual directory listing and evict its data from the cache. More...

virtual Status	RepopulateDirectory (const VfsPath &path)
	request the directory be re-populated when it is next accessed. More...

virtual void	Clear ()
	empty the contents of the filesystem. More...

Public Member Functions inherited from IVFS
virtual	~IVFS ()

Private Member Functions
Status	FindRealPathR (const OsPath &realPath, const VfsDirectory &directory, const VfsPath &curPath, VfsPath &path)

Private Attributes
size_t	m_cacheSize

FileCache	m_fileCache

PITrace	m_trace

VfsDirectory	m_rootDirectory

Constructor & Destructor Documentation

VFS::VFS ( size_t cacheSize )

inline

Member Function Documentation

virtual void VFS::Clear ( )

inlinevirtual

empty the contents of the filesystem.

this is typically only necessary when changing the set of mounted directories, e.g. when switching mods. NB: open files are not affected.

Implements IVFS.

virtual Status VFS::CreateFile	(	const VfsPath &	pathname,
		const shared_ptr< u8 > &	fileContents,
		size_t	size
	)

inlinevirtual

Create a file with the given contents.

Parameters

pathname
fileContents
size	[bytes] of the contents, will match that of the file.

Returns: Status.

rationale: disallowing partial writes simplifies file cache coherency (we need only invalidate cached data when closing a newly written file).

Implements IVFS.

Status VFS::FindRealPathR	(	const OsPath &	realPath,
		const VfsDirectory &	directory,
		const VfsPath &	curPath,
		VfsPath &	path
	)

inlineprivate

virtual Status VFS::GetDirectoryEntries	(	const VfsPath &	path,
		CFileInfos *	fileInfos,
		DirectoryNames *	subdirectoryNames
	)		const

inlinevirtual

Retrieve lists of all files and subdirectories in a directory.

Returns: Status.

Rationale:

this interface avoids having to lock the directory while an iterator is extant.
we cannot efficiently provide routines for returning files and subdirectories separately due to the underlying POSIX interface.

Implements IVFS.

virtual Status VFS::GetDirectoryRealPath	(	const VfsPath &	pathname,
		OsPath &	realPathname
	)

inlinevirtual

retrieve the real (POSIX) pathname underlying a VFS directory.

this is useful for passing paths to external libraries.

Implements IVFS.

virtual Status VFS::GetFileInfo	(	const VfsPath &	pathname,
		CFileInfo *	pfileInfo
	)		const

inlinevirtual

Retrieve information about a file (similar to POSIX stat).

Parameters

pathname
pfileInfo	receives information about the file. Passing NULL suppresses warnings if the file doesn't exist.

Returns: Status.

Implements IVFS.

virtual Status VFS::GetFilePriority	(	const VfsPath &	pathname,
		size_t *	ppriority
	)		const

inlinevirtual

Retrieve mount priority for a file.

Parameters

pathname
ppriority	receives priority value, if the file can be found.

Returns: Status.

Implements IVFS.

virtual Status VFS::GetRealPath	(	const VfsPath &	pathname,
		OsPath &	realPathname
	)

inlinevirtual

retrieve the real (POSIX) pathname underlying a VFS file.

this is useful for passing paths to external libraries.

Implements IVFS.

virtual Status VFS::GetVirtualPath	(	const OsPath &	realPathname,
		VfsPath &	pathname
	)

inlinevirtual

retrieve the VFS pathname that corresponds to a real file.

this is useful for reacting to file change notifications.

the current implementation requires time proportional to the number of directories; this could be accelerated by only checking directories below a mount point with a matching real path.

Implements IVFS.

virtual Status VFS::LoadFile	(	const VfsPath &	pathname,
		shared_ptr< u8 > &	fileContents,
		size_t &	size
	)

inlinevirtual

Read an entire file into memory.

Parameters

pathname
fileContents	receives a smart pointer to the contents. CAVEAT: this will be taken from the file cache if the VFS was created with cacheSize != 0 and size < cacheSize. There is no provision for Copy-on-Write, which means that such buffers must not be modified (this is enforced via mprotect).
size	receives the size [bytes] of the file contents.

Returns: Status.

Implements IVFS.

virtual Status VFS::Mount	(	const VfsPath &	mountPoint,
		const OsPath &	path,
		size_t	flags,
		size_t	priority
	)

inlinevirtual

mount a directory into the VFS.

Parameters

mountPoint	(will be created if it does not already exist)
path	real directory path
flags
priority

Returns: Status.

if files are encountered that already exist in the VFS (sub)directories, the most recent / highest priority/precedence version is preferred.

if files with archive extensions are seen, their contents are added as well.

Implements IVFS.

virtual Status VFS::RemoveFile ( const VfsPath & pathname )

inlinevirtual

remove file from the virtual directory listing and evict its data from the cache.

Implements IVFS.

virtual Status VFS::ReplaceFile	(	const VfsPath &	pathname,
		const shared_ptr< u8 > &	fileContents,
		size_t	size
	)

inlinevirtual

Replace a file with the given contents.

See also: CreateFile

Used to replace a file if it is already present (even if the file is not in the attached vfs directory). Calls CreateFile if the file doesn't yet exist.

Implements IVFS.

virtual Status VFS::RepopulateDirectory ( const VfsPath & path )

inlinevirtual

request the directory be re-populated when it is next accessed.

useful for synchronizing with the underlying filesystem after files have been created or their metadata changed.

Implements IVFS.

virtual std::wstring VFS::TextRepresentation ( ) const

inlinevirtual

Returns: a string representation of all files and directories.

Implements IVFS.

Member Data Documentation

size_t VFS::m_cacheSize

private

FileCache VFS::m_fileCache

private

VfsDirectory VFS::m_rootDirectory

mutableprivate

PITrace VFS::m_trace

private

The documentation for this class was generated from the following file:

/var/svn/checkout/source/lib/file/vfs/vfs.cpp

Public Member Functions

Private Member Functions

Private Attributes

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation