Enum FdWriteSource 

pub(crate) enum FdWriteSource<'a, M: MemorySize> {
    Iovs {
        iovs: WasmPtr<__wasi_ciovec_t<M>, M>,
        iovs_len: M::Offset,
    },
    Buffer(Cow<'a, [u8]>),
}

Variants

Iovs

Fields

iovs: WasmPtr<__wasi_ciovec_t<M>, M>

iovs_len: M::Offset

Buffer(Cow<'a, [u8]>)

Implementations

impl<'a, M: MemorySize> FdWriteSource<'a, M>

pub(crate) fn coalesce( &self, memory: &MemoryView<'_>, max_len: usize, ) -> Result<Cow<'a, [u8]>, Errno>

pub(crate) fn coalesce_from( &self, memory: &MemoryView<'_>, skip: usize, limit: usize, ) -> Result<Cow<'a, [u8]>, Errno>

Gathers at most limit bytes starting skip bytes into the iovecs, treating them as one stream. Unlike Self::coalesce this never sizes an allocation by a guest-declared length, so a caller can walk a large writev in bounded steps instead of refusing it.