lamexfat 0.1.0

// SPDX-License-Identifier: MIT OR Apache-2.0
//! Borrowed filesystem path newtype.

/// A path within the volume, as raw bytes. Components are `/`-separated; empty
/// components and `.` are ignored by the resolver, so `/boot//vmlinuz` and
/// `/boot/vmlinuz` resolve identically. `lamexfat` does not own paths.
#[derive(Copy, Clone, Debug)]
pub struct Path<'a>(&'a [u8]);

impl<'a> Path<'a> {
    /// Wrap a byte slice as a path.
    pub fn new(bytes: &'a [u8]) -> Self {
        Path(bytes)
    }

    /// The raw bytes.
    pub fn as_bytes(&self) -> &'a [u8] {
        self.0
    }

    /// Iterate non-empty, non-`.` path components in order.
    pub(crate) fn components(&self) -> impl Iterator<Item = &'a [u8]> {
        self.0
            .split(|&b| b == b'/')
            .filter(|c| !c.is_empty() && *c != b".")
    }
}

#[cfg(test)]
mod tests {
    extern crate alloc;
    use alloc::vec::Vec;

    use super::*;

    #[test]
    fn splits_and_filters() {
        let p = Path::new(b"/boot//kernel/./vmlinuz");
        let comps: Vec<&[u8]> = p.components().collect();
        assert_eq!(comps, [&b"boot"[..], &b"kernel"[..], &b"vmlinuz"[..]]);
    }

    #[test]
    fn root_has_no_components() {
        assert_eq!(Path::new(b"/").components().count(), 0);
        assert_eq!(Path::new(b"").components().count(), 0);
    }
}