Struct memfs::MemFile

pub struct MemFile { /* private fields */ }

The struct that represents a file in memory that is backed by MappedPages

Implementations

impl MemFile

pub fn create(name: String, parent: &DirRef) -> Result<FileRef, &'static str>

Allocates writable memory space for the given contents and creates a new file containing that content in the given parent directory.

pub fn from_mapped_pages( mapped_pages: MappedPages, name: String, len: usize, parent: &DirRef ) -> Result<FileRef, &'static str>

Creates a new MemFile in the given parent directory with the contents of the given mapped_pages.

Trait Implementations

impl ByteReader for MemFile

fn read_at( &mut self, buffer: &mut [u8], offset: usize ) -> Result<usize, IoError>

Reads bytes of data from this reader into the given buffer.

impl ByteWriter for MemFile

fn write_at(&mut self, buffer: &[u8], offset: usize) -> Result<usize, IoError>

Writes bytes of data from the given buffer to this writer.

fn flush(&mut self) -> Result<(), IoError>

Flushes this writer’s output stream, ensuring all contents in intermediate buffers are fully written out.

impl File for MemFile

fn as_mapping(&self) -> Result<&MappedPages, &'static str>

Returns a view of this file as an immutable memory-mapped region.

impl FsNode for MemFile

fn get_name(&self) -> String

Returns the string name of the node

fn get_parent_dir(&self) -> Option<DirRef>

Returns the parent directory of the current node.

fn set_parent_dir(&mut self, new_parent: WeakDirRef)

Sets this node’s parent directory. This is useful for ensuring correctness when inserting or removing files or directories from their parent directory.

fn get_absolute_path(&self) -> String

Recursively gets the absolute pathname as a String

impl KnownLength for MemFile

fn len(&self) -> usize

Returns the length (size in bytes) of this I/O stream or device.