use std::convert::TryInto;

const GROUP_BY: usize = 16;
pub const fn out_size(in_size: usize) -> usize {
    in_size / 16
}

pub fn run(buf: &mut [u8]) {
    let n_raw = buf.len();
    let mut in_cursor = 0;
    let mut out_cursor = 0;

    while in_cursor + GROUP_BY <= n_raw {
        let a: &[u8; 16] = buf[in_cursor..in_cursor + 16].try_into().unwrap();

        let mut out = 0u8;

        if a[0] == 0x1E {
            out |= 0b10000000;
        }
        if a[2] == 0x1E {
            out |= 0b10000000 >> 1;
        }
        if a[4] == 0x1E {
            out |= 0b10000000 >> 2;
        }
        if a[6] == 0x1E {
            out |= 0b10000000 >> 3;
        }
        if a[8] == 0x1E {
            out |= 0b10000000 >> 4;
        }
        if a[10] == 0x1E {
            out |= 0b10000000 >> 5;
        }
        if a[12] == 0x1E {
            out |= 0b10000000 >> 6;
        }
        if a[14] == 0x1E {
            out |= 0b10000000 >> 7;
        }

        buf[out_cursor] = out;
        out_cursor += 1;
        in_cursor += GROUP_BY;
    }
}