68 lines
1.4 KiB
Rust
68 lines
1.4 KiB
Rust
//! File utilities.
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use crate::{err::*, machdr};
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use std::{fs, path::Path, io::{SeekFrom, prelude::*}};
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/// Confirms that the path `p` is a folder.
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pub fn validate_folder_path(p: &str) -> ResultS<()>
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{
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let at = fs::metadata(p)?;
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if at.is_dir() {
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Ok(())
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} else {
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Err(err_msg("not a directory"))
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}
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}
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/// Opens the file at `path` and skips past any macintosh headers.
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pub fn open_mac<P: AsRef<Path>>(path: P) -> ResultS<fs::File>
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{
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let mut fp = fs::File::open(path)?;
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machdr::skip_mac_header(&mut fp);
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Ok(fp)
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}
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impl<T> Drop for SeekBackToStart<T>
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where T: Seek
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{
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fn drop(&mut self) {if self.fl {let _ = self.seek(SeekFrom::Start(0));}}
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}
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impl<T> std::ops::Deref for SeekBackToStart<T>
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where T: Seek
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{
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type Target = T;
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fn deref(&self) -> &Self::Target {&self.sc}
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}
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impl<T> std::ops::DerefMut for SeekBackToStart<T>
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where T: Seek
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{
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fn deref_mut(&mut self) -> &mut Self::Target {&mut self.sc}
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}
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impl<T> SeekBackToStart<T>
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where T: Seek
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{
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/// Creates a new `SeekBackToStart` object.
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pub fn new(sc: T) -> Self {Self{sc, fl: true}}
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/// Sets the seek-back flag.
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pub fn set_seek(&mut self, fl: bool) {self.fl = fl;}
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/// Returns the seek-back flag.
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pub fn get_seek(&self) -> bool {self.fl}
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}
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/// Seeks back to the starting position of the inner object when losing scope,
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/// unless a flag is set.
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pub struct SeekBackToStart<T: Seek> {
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sc: T,
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fl: bool,
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}
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// EOF
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