Struct io::ByteReaderWriterWrapper

pub struct ByteReaderWriterWrapper<RW: BlockReader + BlockWriter>(_);

A wrapper struct that implements a byte-wise reader and writer atop a block-based reader and writer.

This ideally should be realized via automatic trait implementations, in which all types that implement BlockReader + BlockWriter also implement ByteReader + ByteWriter, but we cannot do that because Rust currently does not support specialization.

Example

Use the From implementation around a BlockReader + BlockWriter instance, such as:

// Assume `storage_dev` implements `BlockReader + BlockWriter`
let mut reader_writer = ByteReaderWriterWrapper::from(storage_dev); 
let bytes_read = reader_writer.read_at(...);
let bytes_written = reader_writer.write_at(...);

Trait Implementations

impl<RW> BlockIo for ByteReaderWriterWrapper<RW>where
    RW: BlockReader + BlockWriter,

fn block_size(&self) -> usize

Returns the size in bytes of a single block (i.e., sector), the minimum granularity of I/O transfers.

impl<RW> BlockReader for ByteReaderWriterWrapper<RW>where
    RW: BlockReader + BlockWriter,

fn read_blocks(
    &mut self,
    buffer: &mut [u8],
    block_offset: usize
) -> Result<usize, IoError>

Reads blocks of data from this reader into the given buffer.

impl<RW> BlockWriter for ByteReaderWriterWrapper<RW>where
    RW: BlockReader + BlockWriter,

fn write_blocks(
    &mut self,
    buffer: &[u8],
    block_offset: usize
) -> Result<usize, IoError>

Writes blocks of data from the given buffer to this writer.

fn flush(&mut self) -> Result<(), IoError>

Flushes this entire writer’s output stream, ensuring all contents in intermediate buffers are fully written out.

impl<RW> ByteReader for ByteReaderWriterWrapper<RW>where
    RW: BlockReader + BlockWriter,

fn read_at(&mut self, buffer: &mut [u8], offset: usize) -> Result<usize, IoError>

Reads bytes of data from this reader into the given buffer.

impl<RW> ByteWriter for ByteReaderWriterWrapper<RW>where
    RW: BlockReader + BlockWriter,

fn write_at(&mut self, buffer: &[u8], offset: usize) -> Result<usize, IoError>

Writes bytes of data from the given buffer to this writer.

fn flush(&mut self) -> Result<(), IoError>

Flushes this writer’s output stream, ensuring all contents in intermediate buffers are fully written out.

impl<RW> From<RW> for ByteReaderWriterWrapper<RW>where
    RW: BlockReader + BlockWriter,

fn from(block_reader_writer: RW) -> Self

Converts to this type from the input type.

impl<RW> KnownLength for ByteReaderWriterWrapper<RW>where
    RW: KnownLength + BlockReader + BlockWriter,

fn len(&self) -> usize

Returns the length (size in bytes) of this I/O stream or device.