rufs 0.6.0

FUSE implementation of FreeBSD's UFSv2
Documentation 
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use super::*;
use crate::{err, InodeNum};

impl<R: Backend> Ufs<R> {
	/// Read the contents of a symbolic link.
	#[doc(alias = "readlink")]
	pub fn symlink_read(&mut self, inr: InodeNum) -> IoResult<Vec<u8>> {
		let ino = self.read_inode(inr)?;

		if ino.kind() != InodeType::Symlink {
			return Err(err!(EINVAL));
		}

		match &ino.data {
			InodeData::Shortlink(link) => {
				assert_eq!(ino.blocks, 0);
				let len = ino.size as usize;
				Ok(link[0..len].to_vec())
			}
			InodeData::Blocks { .. } => {
				// TODO: this has to be tested for other configurations, such as 4K/4K
				assert!(ino.blocks <= 8);

				let len = ino.size as usize;
				let mut buf = vec![0u8; self.superblock.bsize as usize];
				self.inode_read_block(inr, &ino, 0, &mut buf)?;
				buf.resize(len, 0u8);
				Ok(buf)
			}
		}
	}

	fn symlink_set(&mut self, inr: InodeNum, link: &OsStr) -> IoResult<()> {
		let mut ino = self.read_inode(inr)?;
		if ino.kind() != InodeType::Symlink {
			return Err(err!(EINVAL));
		}

		assert_eq!(ino.blocks, 0);

		let len = link.len();
		if len < UFS_SLLEN {
			let mut data = [0u8; UFS_SLLEN];
			data[0..len].copy_from_slice(link.as_bytes());
			ino.data = InodeData::Shortlink(data);
		} else {
			todo!("creating long symlinks");
		}
		ino.size = len as u64;
		self.write_inode(inr, &ino)?;
		Ok(())
	}

	pub fn symlink(
		&mut self,
		dinr: InodeNum,
		name: &OsStr,
		link: &OsStr,
		uid: u32,
		gid: u32,
	) -> IoResult<InodeAttr> {
		self.assert_rw()?;
		let attr = self.mknod(dinr, name, InodeType::Symlink, 0o777, uid, gid)?;
		self.symlink_set(attr.inr, link)?;
		Ok(attr)
	}
}