Struct FileArenaWriter 

pub struct FileArenaWriter { /* private fields */ }

A writer for appending data to an anonymous temp file.

Data is written sequentially during the write phase. The file can then be passed to FileArena for random reads via pread.

Implementations

impl FileArenaWriter

pub fn new() -> Result<Self>

Creates a new writer backed by an anonymous temp file.

pub fn push(&mut self, data: impl AsRef<[u8]>) -> Result<(usize, usize)>

Appends data to the file and returns (offset, len).

For empty input, returns (0, 0) without writing anything.

pub fn len(&self) -> usize

Returns the current cursor position (total bytes written).

pub fn is_empty(&self) -> bool

Returns true if no data has been written.

pub fn finish(self) -> Result<Option<File>>

Flushes the writer and returns the underlying file.

Returns None if no data was written (empty arena).