Struct DataReader

pub struct DataReader { /* private fields */ }

Manages the reading of static file data using memory-mapped files.

Holds file and mmap descriptors of the data and offsets files of a static_file.

Implementations

impl DataReader

pub fn new(path: impl AsRef<Path>) -> Result<Self, NippyJarError>

Reads the respective data and offsets file and returns DataReader.

pub fn offset(&self, index: usize) -> Result<u64, NippyJarError>

Returns the offset for the requested data index

pub fn reverse_offset(&self, index: usize) -> Result<u64, NippyJarError>

Returns the offset for the requested data index starting from the end

pub fn offsets_count(&self) -> Result<usize, NippyJarError>

Returns total number of offsets in the file. The size of one offset is determined by the file itself.

pub const fn offset_size(&self) -> u8

Returns number of bytes that represent one offset.

pub fn data(&self, range: Range<usize>) -> &[u8]

Returns the underlying data as a slice of bytes for the provided range.

pub fn size(&self) -> usize

Returns total size of data

Trait Implementations

impl Debug for DataReader

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 48 bytes