Simulates an actual directory on disk with in-memory storage. More...

#include "virtualFileMountRamdisk.h"

Inheritance diagram for VirtualFileMountRamdisk:

Public Member Functions
virtual bool	atomic_compare_and_exchange_contents (const Filename &file, std::string &orig_contents, const std::string &old_contents, const std::string &new_contents)
	See Filename::atomic_compare_and_exchange_contents(). More...

virtual bool	atomic_read_contents (const Filename &file, std::string &contents) const
	See Filename::atomic_read_contents(). More...

virtual bool	copy_file (const Filename &orig_filename, const Filename &new_filename)
	Attempts to copy the contents of the indicated file to the indicated file. More...

virtual bool	create_file (const Filename &file)
	Attempts to create the indicated file within the mount, if it does not already exist. More...

virtual bool	delete_file (const Filename &file)
	Attempts to delete the indicated file or directory within the mount. More...

virtual TypeHandle	force_init_type ()

virtual std::streamsize	get_file_size (const Filename &file, std::istream *stream) const
	Returns the current size on disk (or wherever it is) of the already-open file. More...

virtual std::streamsize	get_file_size (const Filename &file) const
	Returns the current size on disk (or wherever it is) of the file before it has been opened. More...

virtual time_t	get_timestamp (const Filename &file) const
	Returns a time_t value that represents the time the file was last modified, to within whatever precision the operating system records this information (on a Windows95 system, for instance, this may only be accurate to within 2 seconds). More...

virtual TypeHandle	get_type () const

virtual bool	has_file (const Filename &file) const
	Returns true if the indicated file exists within the mount system. More...

virtual bool	is_directory (const Filename &file) const
	Returns true if the indicated file exists within the mount system and is a directory. More...

virtual bool	is_regular_file (const Filename &file) const
	Returns true if the indicated file exists within the mount system and is a regular file. More...

virtual bool	is_writable (const Filename &file) const
	Returns true if the named file or directory may be written to, false otherwise. More...

virtual bool	make_directory (const Filename &file)
	Attempts to create the indicated file within the mount, if it does not already exist. More...

virtual std::ostream *	open_append_file (const Filename &file)
	Works like open_write_file(), but the file is opened in append mode. More...

virtual std::iostream *	open_read_append_file (const Filename &file)
	Works like open_read_write_file(), but the file is opened in append mode. More...

virtual std::istream *	open_read_file (const Filename &file) const
	Opens the file for reading, if it exists. More...

virtual std::iostream *	open_read_write_file (const Filename &file, bool truncate)
	Opens the file for writing. More...

virtual std::ostream *	open_write_file (const Filename &file, bool truncate)
	Opens the file for writing. More...

virtual void	output (std::ostream &out) const

virtual bool	rename_file (const Filename &orig_filename, const Filename &new_filename)
	Attempts to rename the contents of the indicated file to the indicated file. More...

virtual bool	scan_directory (vector_string &contents, const Filename &dir) const
	Fills the given vector up with the list of filenames that are local to this directory, if the filename is a directory. More...

Public Member Functions inherited from VirtualFileMount
virtual void	close_read_file (std::istream *stream) const
	Closes a file opened by a previous call to open_read_file(). More...

virtual void	close_read_write_file (std::iostream *stream)
	Closes a file opened by a previous call to open_read_write_file(). More...

virtual void	close_write_file (std::ostream *stream)
	Closes a file opened by a previous call to open_write_file(). More...

VirtualFileSystem *	get_file_system () const
	Returns the file system this mount object is attached to. More...

int	get_mount_flags () const
	Returns the set of flags passed by the user to the VirtualFileSystem::mount() command. More...

const Filename &	get_mount_point () const
	Returns the name of the directory within the virtual file system that this mount object is attached to. More...

virtual bool	get_system_info (const Filename &file, SubfileInfo &info)
	Populates the SubfileInfo structure with the data representing where the file actually resides on disk, if this is knowable. More...

virtual PointerTo< VirtualFile >	make_virtual_file (const Filename &local_filename, const Filename &original_filename, bool implicit_pz_file, int open_flags)
	Constructs and returns a new VirtualFile instance that corresponds to the indicated filename within this mount point. More...

std::istream *	open_read_file (const Filename &file, bool do_uncompress) const
	Opens the file for reading. More...

std::ostream *	open_write_file (const Filename &file, bool do_compress, bool truncate)
	Opens the file for writing. More...

virtual bool	read_file (const Filename &file, bool do_uncompress, vector_uchar &result) const
	Fills up the indicated pvector with the contents of the file, if it is a regular file. More...

virtual void	write (std::ostream &out) const

virtual bool	write_file (const Filename &file, bool do_compress, const unsigned char *data, size_t data_size)
	Writes the indicated data to the file, if it is a writable file. More...

Public Member Functions inherited from TypedReferenceCount
	TypedReferenceCount (const TypedReferenceCount &copy)

void	operator= (const TypedReferenceCount &copy)

Public Member Functions inherited from TypedObject
	TypedObject (const TypedObject &copy)=default

TypedObject *	as_typed_object ()
	Returns the object, upcast (if necessary) to a TypedObject pointer. More...

const TypedObject *	as_typed_object () const
	Returns the object, upcast (if necessary) to a TypedObject pointer. More...

int	get_best_parent_from_Set (const std::set< int > &) const

int	get_type_index () const
	Returns the internal index number associated with this object's TypeHandle, a unique number for each different type. More...

bool	is_exact_type (TypeHandle handle) const
	Returns true if the current object is the indicated type exactly. More...

bool	is_of_type (TypeHandle handle) const
	Returns true if the current object is or derives from the indicated type. More...

TypedObject &	operator= (const TypedObject &copy)=default

Public Member Functions inherited from ReferenceCount
int	get_ref_count () const

WeakReferenceList *	get_weak_list () const
	Returns the WeakReferenceList associated with this ReferenceCount object. More...

bool	has_weak_list () const
	Returns true if this particular ReferenceCount object has a WeakReferenceList created, false otherwise. More...

void	local_object ()
	This function should be called, once, immediately after creating a new instance of some ReferenceCount-derived object on the stack. More...

void	ref () const
	Explicitly increments the reference count. More...

bool	ref_if_nonzero () const
	Atomically increases the reference count of this object if it is not zero. More...

bool	test_ref_count_integrity () const
	Does some easy checks to make sure that the reference count isn't completely bogus. More...

bool	test_ref_count_nonzero () const
	Does some easy checks to make sure that the reference count isn't zero, or completely bogus. More...

virtual bool	unref () const
	Explicitly decrements the reference count. More...

WeakReferenceList *	weak_ref ()
	Adds the indicated PointerToVoid as a weak reference to this object. More...

void	weak_unref ()
	Removes the indicated PointerToVoid as a weak reference to this object. More...

Static Public Member Functions
static TypeHandle	get_class_type ()

static void	init_type ()

Static Public Member Functions inherited from VirtualFileMount
static TypeHandle	get_class_type ()

static void	init_type ()

Static Public Member Functions inherited from TypedReferenceCount
static TypeHandle	get_class_type ()

static void	init_type ()

Static Public Member Functions inherited from TypedObject
static TypeHandle	get_class_type ()

static void	init_type ()
	This function is declared non-inline to work around a compiler bug in g++ 2.96. More...

Static Public Member Functions inherited from ReferenceCount
static TypeHandle	get_class_type ()

static void	init_type ()

Additional Inherited Members
Public Attributes inherited from TypedObject
	get_type

Public Attributes inherited from ReferenceCount
	get_ref_count
	Returns the current reference count. More...

Detailed Description

Simulates an actual directory on disk with in-memory storage.

This is useful mainly for performing high level functions that expect disk I/O without actually writing files to disk. Naturally, there are significant limits to the size of the files that may be written with this system; and "files" written here are not automatically persistent between sessions.

Definition at line 30 of file virtualFileMountRamdisk.h.

Member Function Documentation

◆ atomic_compare_and_exchange_contents()

bool VirtualFileMountRamdisk::atomic_compare_and_exchange_contents	(	const Filename &	file,
		std::string &	orig_contents,
		const std::string &	old_contents,
		const std::string &	new_contents
	)

virtual

See Filename::atomic_compare_and_exchange_contents().

Reimplemented from VirtualFileMount.

Definition at line 398 of file virtualFileMountRamdisk.cxx.

◆ atomic_read_contents()

bool VirtualFileMountRamdisk::atomic_read_contents	(	const Filename &	file,
		std::string &	contents
	)		const

virtual

See Filename::atomic_read_contents().

Reimplemented from VirtualFileMount.

Definition at line 425 of file virtualFileMountRamdisk.cxx.

◆ copy_file()

bool VirtualFileMountRamdisk::copy_file	(	const Filename &	orig_filename,
		const Filename &	new_filename
	)

virtual

Attempts to copy the contents of the indicated file to the indicated file.

Both filenames will be within the mount. Returns true on success, false on failure. If this returns false, the copy will be performed by explicit read-and-write operations.

Reimplemented from VirtualFileMount.

Definition at line 134 of file virtualFileMountRamdisk.cxx.

◆ create_file()

bool VirtualFileMountRamdisk::create_file ( const Filename & file )

virtual

Attempts to create the indicated file within the mount, if it does not already exist.

Returns true on success (or if the file already exists), or false if it cannot be created.

Reimplemented from VirtualFileMount.

Definition at line 52 of file virtualFileMountRamdisk.cxx.

◆ delete_file()

bool VirtualFileMountRamdisk::delete_file ( const Filename & file )

virtual

Attempts to delete the indicated file or directory within the mount.

This can remove a single file or an empty directory. It will not remove a nonempty directory. Returns true on success, false on failure.

Reimplemented from VirtualFileMount.

Definition at line 65 of file virtualFileMountRamdisk.cxx.

◆ get_file_size() [1/2]

std::streamsize VirtualFileMountRamdisk::get_file_size	(	const Filename &	file,
		std::istream *	stream
	)		const

virtual

Returns the current size on disk (or wherever it is) of the already-open file.

Pass in the stream that was returned by open_read_file(); some implementations may require this stream to determine the size.

Implements VirtualFileMount.

Definition at line 321 of file virtualFileMountRamdisk.cxx.

◆ get_file_size() [2/2]

std::streamsize VirtualFileMountRamdisk::get_file_size ( const Filename & file ) const

virtual

Returns the current size on disk (or wherever it is) of the file before it has been opened.

Implements VirtualFileMount.

Definition at line 338 of file virtualFileMountRamdisk.cxx.

◆ get_timestamp()

time_t VirtualFileMountRamdisk::get_timestamp ( const Filename & file ) const

virtual

Returns a time_t value that represents the time the file was last modified, to within whatever precision the operating system records this information (on a Windows95 system, for instance, this may only be accurate to within 2 seconds).

If the timestamp cannot be determined, either because it is not supported by the operating system or because there is some error (such as file not found), returns 0.

Implements VirtualFileMount.

Definition at line 361 of file virtualFileMountRamdisk.cxx.

◆ has_file()

bool VirtualFileMountRamdisk::has_file ( const Filename & file ) const

virtual

Returns true if the indicated file exists within the mount system.

Implements VirtualFileMount.

Definition at line 39 of file virtualFileMountRamdisk.cxx.

Referenced by is_writable().

◆ is_directory()

bool VirtualFileMountRamdisk::is_directory ( const Filename & file ) const

virtual

Returns true if the indicated file exists within the mount system and is a directory.

Implements VirtualFileMount.

Definition at line 180 of file virtualFileMountRamdisk.cxx.

◆ is_regular_file()

bool VirtualFileMountRamdisk::is_regular_file ( const Filename & file ) const

virtual

Returns true if the indicated file exists within the mount system and is a regular file.

Implements VirtualFileMount.

Definition at line 192 of file virtualFileMountRamdisk.cxx.

◆ is_writable()

bool VirtualFileMountRamdisk::is_writable ( const Filename & file ) const

virtual

Returns true if the named file or directory may be written to, false otherwise.

Reimplemented from VirtualFileMount.

Definition at line 204 of file virtualFileMountRamdisk.cxx.

References has_file().

◆ make_directory()

bool VirtualFileMountRamdisk::make_directory ( const Filename & file )

virtual

Attempts to create the indicated file within the mount, if it does not already exist.

Returns true on success, or false if it cannot be created. If the directory already existed prior to this call, may return either true or false.

Reimplemented from VirtualFileMount.

Definition at line 168 of file virtualFileMountRamdisk.cxx.

◆ open_append_file()

ostream * VirtualFileMountRamdisk::open_append_file ( const Filename & file )

virtual

Works like open_write_file(), but the file is opened in append mode.

Like open_write_file, the returned pointer should eventually be passed to close_write_file().

Reimplemented from VirtualFileMount.

Definition at line 261 of file virtualFileMountRamdisk.cxx.

◆ open_read_append_file()

iostream * VirtualFileMountRamdisk::open_read_append_file ( const Filename & file )

virtual

Works like open_read_write_file(), but the file is opened in append mode.

Like open_read_write_file, the returned pointer should eventually be passed to close_read_write_file().

Reimplemented from VirtualFileMount.

Definition at line 303 of file virtualFileMountRamdisk.cxx.

◆ open_read_file()

istream * VirtualFileMountRamdisk::open_read_file ( const Filename & file ) const

virtual

Opens the file for reading, if it exists.

Returns a newly allocated istream on success (which you should eventually delete when you are done reading). Returns NULL on failure.

Implements VirtualFileMount.

Definition at line 214 of file virtualFileMountRamdisk.cxx.

◆ open_read_write_file()

iostream * VirtualFileMountRamdisk::open_read_write_file	(	const Filename &	file,
		bool	truncate
	)

virtual

Opens the file for writing.

Returns a newly allocated iostream on success (which you should eventually delete when you are done writing). Returns NULL on failure.

Reimplemented from VirtualFileMount.

Definition at line 278 of file virtualFileMountRamdisk.cxx.

◆ open_write_file()

ostream * VirtualFileMountRamdisk::open_write_file	(	const Filename &	file,
		bool	truncate
	)

virtual

Opens the file for writing.

Returns a newly allocated ostream on success (which you should eventually delete when you are done writing). Returns NULL on failure.

Reimplemented from VirtualFileMount.

Definition at line 232 of file virtualFileMountRamdisk.cxx.

◆ rename_file()

bool VirtualFileMountRamdisk::rename_file	(	const Filename &	orig_filename,
		const Filename &	new_filename
	)

virtual

Attempts to rename the contents of the indicated file to the indicated file.

Both filenames will be within the mount. Returns true on success, false on failure. If this returns false, this will be attempted again with a copy-and-delete operation.

Reimplemented from VirtualFileMount.

Definition at line 79 of file virtualFileMountRamdisk.cxx.

◆ scan_directory()

bool VirtualFileMountRamdisk::scan_directory	(	vector_string &	contents,
		const Filename &	dir
	)		const

virtual

Fills the given vector up with the list of filenames that are local to this directory, if the filename is a directory.

Returns true if successful, or false if the file is not a directory or cannot be read.

Implements VirtualFileMount.

Definition at line 379 of file virtualFileMountRamdisk.cxx.

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

panda/src/express/virtualFileMountRamdisk.h
panda/src/express/virtualFileMountRamdisk.cxx

Public Member Functions

Static Public Member Functions

Additional Inherited Members

Detailed Description

Member Function Documentation

◆ atomic_compare_and_exchange_contents()

◆ atomic_read_contents()

◆ copy_file()

◆ create_file()

◆ delete_file()

◆ get_file_size() [1/2]

◆ get_file_size() [2/2]

◆ get_timestamp()

◆ has_file()

◆ is_directory()

◆ is_regular_file()

◆ is_writable()

◆ make_directory()

◆ open_append_file()

◆ open_read_append_file()

◆ open_read_file()

◆ open_read_write_file()

◆ open_write_file()

◆ rename_file()

◆ scan_directory()