//! Disposable first/last sector reads and out-of-capacity refusal.

use super::*;

pub fn run(boot: &BootData,
    allocator: &mut memory::FrameAllocator) -> Result<(), &'static str> {
    let mut disk = virtio_ro_turkfs::RoDisk::open(
        boot, allocator, "TURKOS/OS/K1505-GET")?;
    let last_lba = disk.capacity().checked_sub(1).ok_or("k1505-empty-disk")?;
    if disk.capacity() != 2048 { return Err("k1505-disk-capacity"); }
    disk.reject_outside_without_publish()?;
    let mut first = [0xa5u8; 512];
    let mut last = [0xa5u8; 512];
    disk.read(0, &mut first)?;
    disk.read(last_lba, &mut last)?;
    if first.iter().any(|&byte| byte != 0)
        || last.iter().any(|&byte| byte != 0) {
        return Err("k1505-read-data");
    }
    disk.close(allocator)?;
    write_line("TURKOS/OS/K1505-GEOMETRY: FIRST=0 LAST=2047 OUTSIDE=REJECTED GETS=2 DATA=ZERO OWNERS=0 FRAMES=RETURNED");
    Ok(())
}