Struct OutputBuffers

pub struct OutputBuffers { /* private fields */ }

CoreVM output buffers (service counterpart).

The service uses this struct to collect output from the guest.

The builder counterpart.

Implementations

impl OutputBuffers

pub fn pre_allocate(&mut self, i: OutputStream, len: usize) -> &mut [u8]

Pre-allocate len bytes in output buffer i.

Returns the mutable slice that references the pre-allocated space.

pub fn export_segments<F, E>(&mut self, export: F) -> Result<(), E>

where F: FnMut(&[u8; 4104]) -> Result<(), E>,

Export all buffers as segments.

Normally export should simply call export_slice.

Use Self::segment_count_after to ensure that max. no. of exported segments is not surpassed.

pub fn stream_len(&self) -> [u32; 4]

Returns the size of each stream.

pub fn segment_count(&self) -> usize

Returns the no. of segments the buffers would require on export.

pub fn segment_count_after(&self, i: OutputStream, len: usize) -> Option<usize>

Returns the no. of segments the buffers will require on export after len bytes is appended to buffer i.

pub fn total_len(&self) -> usize

Returns the total length of the buffers.

Equals the no. of bytes the buffers will require on export.

Trait Implementations

impl Debug for OutputBuffers

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

Formats the value using the given formatter.

impl Default for OutputBuffers

fn default() -> OutputBuffers

Returns the “default value” for a type.