Struct asuran::repository::backend::common::segment::SegmentDataPart

pub struct SegmentDataPart<T> { /* fields omitted */ }

A view over the data portion of a segment.

Implementations

impl<T: Read + Write + Seek> SegmentDataPart<T>

pub fn new(handle: T, size_limit: u64) -> Result<Self>

Will attempt to open the given handle as a SegmentDataPart

Errors

• Will propagate any IO errors
• Will return Err(BackendError::SegmentError) if the segment has a header and it fails validation

pub fn write_header(&mut self) -> Result<bool>

If the segment has non-zero length, will do nothing and return Ok(false).

Otherwise, will write the header to the segment file.

Errors

Will return Err if any underlying I/O errors occur

pub fn read_header(&mut self) -> Result<Header>

Will attempt to read the header from the segment

Errors

• Will return Err(BackendError::Unknown) if deserializing the header fails
• Will propagate any I/O errors that occur

pub fn size(&mut self) -> Result<u64>

Returns the current size of the segment file

Errors

Will propagate any I/O errors that occur

pub fn free_bytes(&mut self) -> Result<u64>

Returns the number of free bytes remaining in this segment

pub fn read_chunk(&mut self, header: SegmentHeaderEntry) -> Result<Chunk>

pub fn write_chunk(&mut self, chunk: Chunk) -> Result<SegmentHeaderEntry>