Struct hdfs_native::file::FileReader

pub struct FileReader { /* private fields */ }

Implementations

impl FileReader

pub fn file_length(&self) -> usize

pub async fn read(&mut self, len: usize) -> Result<Bytes>

Read up to len bytes into a new Bytes object, advancing the internal position in the file. An empty Bytes object will be returned if the end of the file has been reached.

pub async fn read_buf(&mut self, buf: &mut [u8]) -> Result<usize>

Read up to buf.len() bytes into the provided slice, advancing the internal position in the file. Returns the number of bytes that were read, or 0 if the end of the file has been reached.

pub async fn read_range(&self, offset: usize, len: usize) -> Result<Bytes>

Read up to len bytes starting at offset into a new Bytes object. The returned buffer could be smaller than len if offset + len extends beyond the end of the file.

pub async fn read_range_buf(&self, buf: &mut [u8], offset: usize) -> Result<()>

Read file data into an existing buffer. Buffer will be extended by the length of the file.