Method read

crates/wasmtime/src/runtime/memory.rs:354–368

Safely reads memory contents at the given offset into a buffer. The entire buffer will be filled. If `offset + buffer.len()` exceed the current memory capacity, then the buffer is left untouched and a [`MemoryAccessError`] is returned. # Errors This function will return an [`OutOfMemory`][crate::OutOfMemory] error when memory allocation fails. See the `OutOfMemory` type's documentation for det

(
        &self,
        store: impl AsContext,
        offset: usize,
        buffer: &mut [u8],
    )

    ///
    /// Panics if this memory doesn't belong to `store`.
    pub fn read(
        &self,
        store: impl AsContext,
        offset: usize,
        buffer: &mut [u8],
    ) -> Result<(), MemoryAccessError> {
        let store = store.as_context();
        let slice = self
            .data(&store)
            .get(offset..)
            .and_then(|s| s.get(..buffer.len()))
            .ok_or(MemoryAccessError { _private: () })?;
        buffer.copy_from_slice(slice);
        Ok(())
    }

    /// Safely writes contents of a buffer to this memory at the given offset.
    ///