Method read

crates/vm/src/stdlib/_io.rs:299–310

Read k bytes from the object and return.

(&mut self, bytes: Option<usize>)

        //Read k bytes from the object and return.
        fn read(&mut self, bytes: Option<usize>) -> Option<Vec<u8>> {
            let pos = self.cursor.position().to_usize()?;
            let avail_slice = self.cursor.get_ref().get(pos..)?;
            // if we don't specify the number of bytes, or it's too big, give the whole rest of the slice
            let n = bytes.map_or_else(
                || avail_slice.len(),
                |n| core::cmp::min(n, avail_slice.len()),
            );
            let b = avail_slice[..n].to_vec();
            self.cursor.set_position((pos + n) as u64);
            Some(b)
        }

        const fn tell(&self) -> u64 {
            self.cursor.position()