Struct ErofsFilesystem 

pub struct ErofsFilesystem { /* private fields */ }

The filesystem implementation for an EROFS image.

Implementations

impl ErofsFilesystem

pub fn new(reader: Arc<dyn Reader>) -> Result<Self, ErofsError>

Creates a new filesystem instance for an EROFS image from a reader.

pub fn block_size(&self) -> u64

Returns the block size of the EROFS image.

pub fn node(&self, nid: u64) -> Result<Node, ErofsError>

Returns the node with the given nid.

pub fn root_node(&self) -> DirectoryNode

Returns the root node of the EROFS image.

pub fn read_file_range( &self, node: &FileNode, offset: u64, buf: &mut [u8], ) -> Result<usize, ErofsError>

Reads the data of the given file node into a buffer.

pub fn read_directory( &self, node: &DirectoryNode, entry_offset: usize, entries: &mut [DirectoryEntry], ) -> Result<usize, ErofsError>

Read a number of entries from a directory, starting at entry_offset. Will retrieve up to the number of entries in the directory or the size of the provided buffer, returning the number of entries filled in the buffer. If there are less filled entries then the number of entry slots provided in the buffer, there are no more entries in this directory. Entries are sorted lexicographically. Reads past the end of the number of entries will return zero entries filled.

TODO(https://fxbug.dev/479841115): It is possible for directories to omit their “.” entries in erofs, and in that case there is a flag marking it and we are expected to synthesize it. Parse that flag and implement it. TODO(https://fxbug.dev/479841115): This API is slightly awkward to hold. We should consider making it an iterator interface.

pub fn lookup( &self, dir: &DirectoryNode, name: &str, ) -> Result<Option<Node>, ErofsError>

Looks up a node by name in a directory.