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use std::os::unix::io::AsRawFd;
use std::os::unix::io::RawFd;

/// Slice of the file
/// This works only on raw fd
#[derive(Default, Debug, Clone)]
pub struct AsyncFileSlice {
    fd: RawFd,
    position: u64,
    len: u64,
}

impl AsyncFileSlice {
    pub fn new(fd: RawFd, position: u64, len: u64) -> Self {
        Self { fd, position, len }
    }

    pub fn position(&self) -> u64 {
        self.position
    }

    pub fn len(&self) -> u64 {
        self.len
    }

    pub fn is_empty(&self) -> bool {
        self.len == 0
    }

    pub fn fd(&self) -> RawFd {
        self.fd
    }
}

impl AsRawFd for AsyncFileSlice {
    fn as_raw_fd(&self) -> RawFd {
        self.fd
    }
}