Method read_exact

crates/tinywasm/src/store/memory/mod.rs:129–145

Reads exactly `dst.len()` bytes starting at `addr`.

(&self, addr: usize, dst: &mut [u8])

    /// Reads exactly `dst.len()` bytes starting at `addr`.
    fn read_exact(&self, addr: usize, dst: &mut [u8]) -> Option<()> {
        let end = addr.checked_add(dst.len())?;
        if end > self.len() {
            return None;
        }

        let mut offset = 0;
        while offset < dst.len() {
            let read = self.read(addr + offset, &mut dst[offset..]);
            if read == 0 {
                return None;
            }
            offset += read;
        }

        Some(())
    }

    /// Reads `len` bytes starting at `addr` into a newly allocated buffer.
    fn read_vec(&self, addr: usize, len: usize) -> Option<Vec<u8>> {