Trait MessageData 

pub trait MessageData: Sized + Debug {
    // Required methods
    fn copy_from_user(
        data: &mut dyn InputBuffer,
        limit: usize,
    ) -> Result<Self, Errno>;
    fn ptr(&self) -> Result<*const u8, Errno>;
    fn with_bytes<O, F: FnMut(&[u8]) -> Result<O, Errno>>(
        &self,
        f: F,
    ) -> Result<O, Errno>;
    fn len(&self) -> usize;
    fn split_off(&mut self, index: usize) -> Option<Self>;
    fn copy_to_user(&self, data: &mut dyn OutputBuffer) -> Result<usize, Errno>;
    fn clone_at_most(&self, limit: usize) -> Self;
    fn truncate(&mut self, limit: usize);
}

Stores an arbitrary sequence of bytes.

Required Methods

fn copy_from_user( data: &mut dyn InputBuffer, limit: usize, ) -> Result<Self, Errno>

Copies data from user memory into a new MessageData object.

fn ptr(&self) -> Result<*const u8, Errno>

Returns a pointer to this data.

fn with_bytes<O, F: FnMut(&[u8]) -> Result<O, Errno>>( &self, f: F, ) -> Result<O, Errno>

Calls the provided function with this data’s bytes.

fn len(&self) -> usize

Returns the number of bytes in the message.

fn split_off(&mut self, index: usize) -> Option<Self>

Splits the message data at index.

After this call returns, at most at bytes will be stored in this MessageData, and any remaining bytes will be moved to the returned MessageData.

fn copy_to_user(&self, data: &mut dyn OutputBuffer) -> Result<usize, Errno>

Copies the message out to the output buffer.

Returns the number of bytes that were read into the buffer.

fn clone_at_most(&self, limit: usize) -> Self

Clones this data up to a limit.

fn truncate(&mut self, limit: usize)

Truncates this data to the specified limit.

Does nothing if the limit is larger than the data’s size.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl MessageData for Arc<VmsplicePayload>

fn copy_from_user( _data: &mut dyn InputBuffer, _limit: usize, ) -> Result<Self, Errno>

fn ptr(&self) -> Result<*const u8, Errno>

fn with_bytes<O, F: FnMut(&[u8]) -> Result<O, Errno>>( &self, f: F, ) -> Result<O, Errno>

fn len(&self) -> usize

fn split_off(&mut self, limit: usize) -> Option<Self>

fn truncate(&mut self, limit: usize)

fn clone_at_most(&self, limit: usize) -> Self

fn copy_to_user(&self, data: &mut dyn OutputBuffer) -> Result<usize, Errno>

impl MessageData for Vec<u8>

fn copy_from_user( data: &mut dyn InputBuffer, limit: usize, ) -> Result<Self, Errno>

fn ptr(&self) -> Result<*const u8, Errno>

fn with_bytes<O, F: FnMut(&[u8]) -> Result<O, Errno>>( &self, f: F, ) -> Result<O, Errno>

fn len(&self) -> usize

fn split_off(&mut self, index: usize) -> Option<Self>

fn copy_to_user(&self, data: &mut dyn OutputBuffer) -> Result<usize, Errno>

fn clone_at_most(&self, limit: usize) -> Self

fn truncate(&mut self, limit: usize)

Implementors

impl MessageData for PipeMessageData