2018-05-10 21:00:59 +08:00
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#[cfg(feature = "alloc")]
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use core::{slice, iter};
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2018-05-10 07:00:24 +08:00
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use io::prelude::*;
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use io;
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use io::{ErrorKind, SeekFrom};
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2017-10-06 22:42:29 +08:00
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2017-11-08 21:05:14 +08:00
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use fs::{FileSystemRef, DiskSlice};
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2017-10-07 20:56:50 +08:00
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use file::File;
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2018-05-10 21:00:59 +08:00
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use dir_entry::{DirEntry, DirEntryData, DirFileEntryData, DirLfnEntryData, FileAttributes, ShortName, DIR_ENTRY_SIZE};
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2017-09-23 02:50:41 +08:00
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2018-05-10 21:00:59 +08:00
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#[cfg(feature = "alloc")]
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use dir_entry::{LFN_PART_LEN, LFN_ENTRY_LAST_FLAG};
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#[cfg(all(not(feature = "std"), feature = "alloc"))]
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2018-05-10 07:00:24 +08:00
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use alloc::Vec;
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2017-10-06 22:07:11 +08:00
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#[derive(Clone)]
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2017-10-07 21:00:27 +08:00
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pub(crate) enum DirRawStream<'a, 'b: 'a> {
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2017-10-07 20:56:50 +08:00
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File(File<'a, 'b>),
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Root(DiskSlice<'a, 'b>),
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2017-09-27 20:05:58 +08:00
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}
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2017-10-09 20:59:52 +08:00
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impl <'a, 'b> DirRawStream<'a, 'b> {
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2017-10-21 21:51:19 +08:00
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pub(crate) fn abs_pos(&self) -> Option<u64> {
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2017-10-09 20:59:52 +08:00
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match self {
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2017-10-21 21:51:19 +08:00
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&DirRawStream::File(ref file) => file.abs_pos(),
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&DirRawStream::Root(ref slice) => Some(slice.abs_pos()),
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2017-10-09 20:59:52 +08:00
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}
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}
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2017-10-27 20:12:53 +08:00
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pub(crate) fn first_cluster(&self) -> Option<u32> {
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match self {
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&DirRawStream::File(ref file) => file.first_cluster(),
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&DirRawStream::Root(_) => None,
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}
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}
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2017-10-09 20:59:52 +08:00
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}
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2017-10-07 21:00:27 +08:00
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impl <'a, 'b> Read for DirRawStream<'a, 'b> {
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2017-09-27 20:05:58 +08:00
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fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
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match self {
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2017-10-07 21:00:27 +08:00
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&mut DirRawStream::File(ref mut file) => file.read(buf),
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&mut DirRawStream::Root(ref mut raw) => raw.read(buf),
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2017-09-27 20:05:58 +08:00
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}
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}
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}
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2017-10-15 21:56:01 +08:00
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impl <'a, 'b> Write for DirRawStream<'a, 'b> {
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fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
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match self {
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&mut DirRawStream::File(ref mut file) => file.write(buf),
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&mut DirRawStream::Root(ref mut raw) => raw.write(buf),
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}
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}
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fn flush(&mut self) -> io::Result<()> {
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match self {
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&mut DirRawStream::File(ref mut file) => file.flush(),
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&mut DirRawStream::Root(ref mut raw) => raw.flush(),
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}
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}
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}
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2017-10-07 21:00:27 +08:00
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impl <'a, 'b> Seek for DirRawStream<'a, 'b> {
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2017-09-27 20:05:58 +08:00
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fn seek(&mut self, pos: SeekFrom) -> io::Result<u64> {
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match self {
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2017-10-07 21:00:27 +08:00
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&mut DirRawStream::File(ref mut file) => file.seek(pos),
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&mut DirRawStream::Root(ref mut raw) => raw.seek(pos),
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2017-09-27 20:05:58 +08:00
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}
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}
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}
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2017-11-08 23:03:08 +08:00
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fn split_path<'c>(path: &'c str) -> (&'c str, Option<&'c str>) {
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2017-11-08 23:47:12 +08:00
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// remove trailing slash and split into 2 components - top-most parent and rest
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2017-11-08 23:03:08 +08:00
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let mut path_split = path.trim_matches('/').splitn(2, "/");
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2017-11-08 23:47:12 +08:00
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let comp = path_split.next().unwrap(); // SAFE: splitn always returns at least one element
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2017-11-08 23:03:08 +08:00
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let rest_opt = path_split.next();
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(comp, rest_opt)
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}
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2017-10-21 22:25:04 +08:00
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/// FAT directory
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2017-10-06 22:07:11 +08:00
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#[derive(Clone)]
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2017-10-07 20:56:50 +08:00
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pub struct Dir<'a, 'b: 'a> {
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2017-10-21 21:51:19 +08:00
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stream: DirRawStream<'a, 'b>,
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2017-10-07 20:56:50 +08:00
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fs: FileSystemRef<'a, 'b>,
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2017-09-24 01:42:09 +08:00
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}
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2017-10-07 20:56:50 +08:00
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impl <'a, 'b> Dir<'a, 'b> {
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2017-10-25 23:20:27 +08:00
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2017-10-21 21:51:19 +08:00
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pub(crate) fn new(stream: DirRawStream<'a, 'b>, fs: FileSystemRef<'a, 'b>) -> Dir<'a, 'b> {
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Dir { stream, fs }
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2017-09-24 01:42:09 +08:00
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}
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2017-10-25 23:20:27 +08:00
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2017-10-21 22:25:04 +08:00
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/// Creates directory entries iterator
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2017-10-07 20:56:50 +08:00
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pub fn iter(&self) -> DirIter<'a, 'b> {
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DirIter {
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2017-10-21 21:51:19 +08:00
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stream: self.stream.clone(),
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2017-10-06 22:07:11 +08:00
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fs: self.fs.clone(),
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2017-10-07 08:16:34 +08:00
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err: false,
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2017-10-06 22:07:11 +08:00
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}
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}
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2017-10-25 23:20:27 +08:00
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2017-10-07 20:56:50 +08:00
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fn find_entry(&mut self, name: &str) -> io::Result<DirEntry<'a, 'b>> {
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2017-10-06 22:07:11 +08:00
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for r in self.iter() {
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let e = r?;
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2017-11-08 23:47:12 +08:00
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// compare name ignoring case
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2017-10-06 22:07:11 +08:00
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if e.file_name().eq_ignore_ascii_case(name) {
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return Ok(e);
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}
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}
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Err(io::Error::new(ErrorKind::NotFound, "file not found"))
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2017-09-24 08:10:59 +08:00
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}
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2017-10-25 23:20:27 +08:00
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2017-10-21 22:25:04 +08:00
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/// Opens existing directory
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2017-10-07 20:56:50 +08:00
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pub fn open_dir(&mut self, path: &str) -> io::Result<Dir<'a, 'b>> {
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2017-11-08 23:03:08 +08:00
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let (name, rest_opt) = split_path(path);
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2017-10-06 22:07:11 +08:00
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let e = self.find_entry(name)?;
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match rest_opt {
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Some(rest) => e.to_dir().open_dir(rest),
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None => Ok(e.to_dir())
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}
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}
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2017-10-25 23:20:27 +08:00
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2017-10-21 22:25:04 +08:00
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/// Opens existing file.
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2017-10-07 20:56:50 +08:00
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pub fn open_file(&mut self, path: &str) -> io::Result<File<'a, 'b>> {
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2017-11-08 23:03:08 +08:00
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let (name, rest_opt) = split_path(path);
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2017-10-06 22:07:11 +08:00
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let e = self.find_entry(name)?;
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match rest_opt {
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Some(rest) => e.to_dir().open_file(rest),
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None => Ok(e.to_file())
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}
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}
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2017-10-25 23:20:27 +08:00
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2017-11-09 03:40:36 +08:00
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/// Creates new file or opens existing without truncating.
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2017-10-21 21:35:26 +08:00
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pub fn create_file(&mut self, path: &str) -> io::Result<File<'a, 'b>> {
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2017-11-08 23:03:08 +08:00
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let (name, rest_opt) = split_path(path);
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2017-10-21 21:35:26 +08:00
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let r = self.find_entry(name);
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match rest_opt {
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Some(rest) => r?.to_dir().create_file(rest),
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None => {
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match r {
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2017-11-07 08:06:52 +08:00
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Err(ref err) if err.kind() == ErrorKind::NotFound =>
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Ok(self.create_entry(name, FileAttributes::from_bits_truncate(0), None)?.to_file()),
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Err(err) => Err(err),
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Ok(e) => Ok(e.to_file()),
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2017-10-21 21:35:26 +08:00
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}
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}
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}
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}
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2017-10-25 23:20:27 +08:00
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2017-10-27 20:12:53 +08:00
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/// Creates new directory or opens existing.
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pub fn create_dir(&mut self, path: &str) -> io::Result<Dir<'a, 'b>> {
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2017-11-08 23:03:08 +08:00
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let (name, rest_opt) = split_path(path);
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2017-10-27 20:12:53 +08:00
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let r = self.find_entry(name);
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match rest_opt {
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Some(rest) => r?.to_dir().create_dir(rest),
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None => {
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match r {
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2017-11-07 08:06:52 +08:00
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Err(ref err) if err.kind() == ErrorKind::NotFound => {
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2017-11-08 23:47:12 +08:00
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// alloc cluster for directory data
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2017-10-27 20:12:53 +08:00
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let cluster = self.fs.alloc_cluster(None)?;
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2017-11-08 23:47:12 +08:00
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// create entry in parent directory
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2017-10-27 20:12:53 +08:00
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let entry = self.create_entry(name, FileAttributes::DIRECTORY, Some(cluster))?;
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let mut dir = entry.to_dir();
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2017-11-08 23:47:12 +08:00
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// create special entries "." and ".."
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2017-10-27 20:12:53 +08:00
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dir.create_entry(".", FileAttributes::DIRECTORY, entry.first_cluster())?;
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dir.create_entry("..", FileAttributes::DIRECTORY, self.stream.first_cluster())?;
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Ok(dir)
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},
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2017-11-07 08:06:52 +08:00
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Err(err) => Err(err),
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2017-10-27 20:12:53 +08:00
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Ok(e) => Ok(e.to_dir()),
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}
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}
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}
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}
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2017-10-16 04:42:26 +08:00
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fn is_empty(&mut self) -> io::Result<bool> {
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2017-11-08 23:47:12 +08:00
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// check if directory contains no files
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2017-10-16 04:42:26 +08:00
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for r in self.iter() {
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let e = r?;
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let name = e.file_name();
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2017-11-08 23:47:12 +08:00
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// ignore special entries "." and ".."
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2017-10-16 04:42:26 +08:00
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if name != "." && name != ".." {
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return Ok(false);
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}
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}
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Ok(true)
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}
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2017-10-25 23:20:27 +08:00
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2017-10-21 22:25:04 +08:00
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/// Removes existing file or directory.
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///
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/// Make sure there is no reference to this file (no File instance) or filesystem corruption
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/// can happen.
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2017-10-16 04:42:26 +08:00
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pub fn remove(&mut self, path: &str) -> io::Result<()> {
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2017-11-08 23:03:08 +08:00
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let (name, rest_opt) = split_path(path);
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2017-10-16 04:42:26 +08:00
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let e = self.find_entry(name)?;
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match rest_opt {
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Some(rest) => e.to_dir().remove(rest),
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None => {
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trace!("removing {}", path);
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2017-11-08 23:47:12 +08:00
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// in case of directory check if it is empty
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2017-10-16 04:42:26 +08:00
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if e.is_dir() && !e.to_dir().is_empty()? {
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return Err(io::Error::new(ErrorKind::NotFound, "removing non-empty directory is denied"));
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}
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2017-11-08 23:47:12 +08:00
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// free directory data
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2017-10-16 04:42:26 +08:00
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match e.first_cluster() {
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Some(n) => self.fs.cluster_iter(n).free()?,
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_ => {},
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}
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2017-11-08 23:47:12 +08:00
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// free long and short name entries
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2017-10-21 21:51:19 +08:00
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let mut stream = self.stream.clone();
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2017-10-16 04:42:26 +08:00
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stream.seek(SeekFrom::Start(e.offset_range.0 as u64))?;
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let num = (e.offset_range.1 - e.offset_range.0) as usize / DIR_ENTRY_SIZE as usize;
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for _ in 0..num {
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let mut data = DirEntryData::deserialize(&mut stream)?;
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trace!("removing dir entry {:?}", data);
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2017-11-08 08:23:00 +08:00
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data.set_free();
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2017-10-16 04:42:26 +08:00
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stream.seek(SeekFrom::Current(-(DIR_ENTRY_SIZE as i64)))?;
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data.serialize(&mut stream)?;
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}
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Ok(())
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}
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}
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}
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2017-10-25 23:20:27 +08:00
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2017-10-21 21:35:26 +08:00
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fn find_free_entries(&mut self, num_entries: usize) -> io::Result<DirRawStream<'a, 'b>> {
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2017-10-21 21:51:19 +08:00
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let mut stream = self.stream.clone();
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2017-10-21 21:35:26 +08:00
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let mut first_free = 0;
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let mut num_free = 0;
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let mut i = 0;
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loop {
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2017-10-27 21:03:54 +08:00
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let raw_entry = DirEntryData::deserialize(&mut stream)?;
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if raw_entry.is_end() {
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2017-11-08 23:47:12 +08:00
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// first unused entry - all remaining space can be used
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2017-10-27 21:03:54 +08:00
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if num_free == 0 {
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first_free = i;
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}
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stream.seek(io::SeekFrom::Start(first_free as u64 * DIR_ENTRY_SIZE))?;
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return Ok(stream);
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} else if raw_entry.is_free() {
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2017-11-08 23:47:12 +08:00
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// free entry - calculate number of free entries in a row
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2017-10-21 21:35:26 +08:00
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if num_free == 0 {
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first_free = i;
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}
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num_free += 1;
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if num_free == num_entries {
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2017-11-08 23:47:12 +08:00
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// enough space for new file
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2017-10-21 21:35:26 +08:00
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stream.seek(io::SeekFrom::Start(first_free as u64 * DIR_ENTRY_SIZE))?;
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return Ok(stream);
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}
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} else {
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2017-11-08 23:47:12 +08:00
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// used entry - start counting from 0
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2017-10-21 21:35:26 +08:00
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num_free = 0;
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}
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i += 1;
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}
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}
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2017-10-25 23:20:27 +08:00
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2018-05-10 21:00:59 +08:00
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#[cfg(feature = "alloc")]
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fn create_lfn_entries(&mut self, name: &str, short_name: &[u8]) -> io::Result<(DirRawStream<'a, 'b>, u64)> {
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// get short name checksum
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2017-11-08 23:03:08 +08:00
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let lfn_chsum = lfn_checksum(&short_name);
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2018-05-10 21:00:59 +08:00
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// convert long name to UTF-16
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2017-11-08 23:03:08 +08:00
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let lfn_utf16 = name.encode_utf16().collect::<Vec<u16>>();
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let lfn_iter = LfnEntriesGenerator::new(&lfn_utf16, lfn_chsum);
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2017-11-08 23:47:12 +08:00
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// find space for new entries
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2017-11-08 23:03:08 +08:00
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let num_entries = lfn_iter.len() + 1; // multiple lfn entries + one file entry
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2017-10-21 21:35:26 +08:00
|
|
|
let mut stream = self.find_free_entries(num_entries)?;
|
|
|
|
let start_pos = stream.seek(io::SeekFrom::Current(0))?;
|
2017-11-08 23:47:12 +08:00
|
|
|
// write LFN entries first
|
2017-11-08 23:03:08 +08:00
|
|
|
for lfn_entry in lfn_iter {
|
2017-10-21 21:35:26 +08:00
|
|
|
lfn_entry.serialize(&mut stream)?;
|
|
|
|
}
|
2018-05-10 21:00:59 +08:00
|
|
|
Ok((stream, start_pos))
|
|
|
|
}
|
|
|
|
#[cfg(not(feature = "alloc"))]
|
|
|
|
fn create_lfn_entries(&mut self, _name: &str, _short_name: &[u8]) -> io::Result<(DirRawStream<'a, 'b>, u64)> {
|
|
|
|
let mut stream = self.find_free_entries(1)?;
|
|
|
|
let start_pos = stream.seek(io::SeekFrom::Current(0))?;
|
|
|
|
Ok((stream, start_pos))
|
|
|
|
}
|
|
|
|
|
|
|
|
fn create_entry(&mut self, name: &str, attrs: FileAttributes, first_cluster: Option<u32>) -> io::Result<DirEntry<'a, 'b>> {
|
|
|
|
trace!("create_entry {}", name);
|
|
|
|
// check if name doesn't contain unsupported characters
|
|
|
|
validate_long_name(name)?;
|
|
|
|
// generate short name
|
|
|
|
let short_name = generate_short_name(name);
|
|
|
|
// generate long entries
|
|
|
|
let (mut stream, start_pos) = self.create_lfn_entries(&name, &short_name)?;
|
2017-11-08 23:47:12 +08:00
|
|
|
// create and write short name entry
|
2017-11-08 08:23:00 +08:00
|
|
|
let mut raw_entry = DirFileEntryData::new(short_name, attrs);
|
2017-11-09 02:41:05 +08:00
|
|
|
raw_entry.set_first_cluster(first_cluster, self.fs.fat_type());
|
2017-11-08 07:18:31 +08:00
|
|
|
raw_entry.reset_created();
|
2017-11-08 08:23:00 +08:00
|
|
|
raw_entry.reset_accessed();
|
|
|
|
raw_entry.reset_modified();
|
2017-10-21 21:35:26 +08:00
|
|
|
raw_entry.serialize(&mut stream)?;
|
|
|
|
let end_pos = stream.seek(io::SeekFrom::Current(0))?;
|
2017-10-21 21:51:19 +08:00
|
|
|
let abs_pos = stream.abs_pos().map(|p| p - DIR_ENTRY_SIZE);
|
2017-11-08 23:47:12 +08:00
|
|
|
// return new logical entry descriptor
|
2018-05-10 21:00:59 +08:00
|
|
|
let short_name = ShortName::new(raw_entry.name());
|
2017-10-21 21:35:26 +08:00
|
|
|
return Ok(DirEntry {
|
|
|
|
data: raw_entry,
|
2018-05-10 21:00:59 +08:00
|
|
|
short_name,
|
|
|
|
#[cfg(feature = "alloc")]
|
2017-10-21 21:35:26 +08:00
|
|
|
lfn: Vec::new(),
|
|
|
|
fs: self.fs,
|
2017-11-08 23:47:12 +08:00
|
|
|
entry_pos: abs_pos.unwrap(), // SAFE: abs_pos is absent only for empty file
|
2017-10-21 21:35:26 +08:00
|
|
|
offset_range: (start_pos, end_pos),
|
|
|
|
});
|
|
|
|
}
|
2017-10-06 22:07:11 +08:00
|
|
|
}
|
|
|
|
|
2017-10-21 22:25:04 +08:00
|
|
|
/// Directory entries iterator.
|
2017-10-06 22:07:11 +08:00
|
|
|
#[derive(Clone)]
|
2017-10-07 20:56:50 +08:00
|
|
|
pub struct DirIter<'a, 'b: 'a> {
|
2017-10-21 21:51:19 +08:00
|
|
|
stream: DirRawStream<'a, 'b>,
|
2017-10-07 20:56:50 +08:00
|
|
|
fs: FileSystemRef<'a, 'b>,
|
2017-10-07 08:16:34 +08:00
|
|
|
err: bool,
|
2017-10-06 22:07:11 +08:00
|
|
|
}
|
|
|
|
|
2017-10-07 20:56:50 +08:00
|
|
|
impl <'a, 'b> DirIter<'a, 'b> {
|
2017-10-16 04:42:26 +08:00
|
|
|
fn read_dir_entry(&mut self) -> io::Result<Option<DirEntry<'a, 'b>>> {
|
2018-05-10 21:00:59 +08:00
|
|
|
#[cfg(feature = "alloc")]
|
2017-10-16 04:42:26 +08:00
|
|
|
let mut lfn_buf = LongNameBuilder::new();
|
2017-10-21 21:51:19 +08:00
|
|
|
let mut offset = self.stream.seek(SeekFrom::Current(0))?;
|
2017-10-16 04:42:26 +08:00
|
|
|
let mut begin_offset = offset;
|
|
|
|
loop {
|
2017-10-27 21:03:54 +08:00
|
|
|
let raw_entry = DirEntryData::deserialize(&mut self.stream)?;
|
2017-10-16 04:42:26 +08:00
|
|
|
offset += DIR_ENTRY_SIZE;
|
|
|
|
match raw_entry {
|
|
|
|
DirEntryData::File(data) => {
|
|
|
|
// Check if this is end of dif
|
|
|
|
if data.is_end() {
|
|
|
|
return Ok(None);
|
|
|
|
}
|
|
|
|
// Check if this is deleted or volume ID entry
|
2017-11-08 23:03:08 +08:00
|
|
|
if data.is_free() || data.is_volume() {
|
2018-05-10 21:00:59 +08:00
|
|
|
#[cfg(feature = "alloc")]
|
2017-10-16 04:42:26 +08:00
|
|
|
lfn_buf.clear();
|
|
|
|
begin_offset = offset;
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
// Get entry position on volume
|
2017-11-08 23:47:12 +08:00
|
|
|
let abs_pos = self.stream.abs_pos().map(|p| p - DIR_ENTRY_SIZE);
|
2017-10-16 04:42:26 +08:00
|
|
|
// Check if LFN checksum is valid
|
2018-05-10 21:00:59 +08:00
|
|
|
#[cfg(feature = "alloc")]
|
2017-11-08 23:03:08 +08:00
|
|
|
lfn_buf.validate_chksum(data.name());
|
2018-05-10 21:00:59 +08:00
|
|
|
// Return directory entry
|
|
|
|
let short_name = ShortName::new(data.name());
|
2017-10-16 04:42:26 +08:00
|
|
|
return Ok(Some(DirEntry {
|
|
|
|
data,
|
2018-05-10 21:00:59 +08:00
|
|
|
short_name,
|
|
|
|
#[cfg(feature = "alloc")]
|
2017-10-16 04:42:26 +08:00
|
|
|
lfn: lfn_buf.to_vec(),
|
|
|
|
fs: self.fs,
|
2017-11-08 23:47:12 +08:00
|
|
|
entry_pos: abs_pos.unwrap(), // SAFE: abs_pos is empty only for empty file
|
2017-10-16 04:42:26 +08:00
|
|
|
offset_range: (begin_offset, offset),
|
|
|
|
}));
|
|
|
|
},
|
|
|
|
DirEntryData::Lfn(data) => {
|
|
|
|
// Check if this is deleted entry
|
2017-10-21 21:51:19 +08:00
|
|
|
if data.is_free() {
|
2018-05-10 21:00:59 +08:00
|
|
|
#[cfg(feature = "alloc")]
|
2017-10-16 04:42:26 +08:00
|
|
|
lfn_buf.clear();
|
|
|
|
begin_offset = offset;
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
// Append to LFN buffer
|
2018-05-10 21:00:59 +08:00
|
|
|
#[cfg(feature = "alloc")]
|
2017-10-16 04:42:26 +08:00
|
|
|
lfn_buf.process(&data);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
impl <'a, 'b> Iterator for DirIter<'a, 'b> {
|
|
|
|
type Item = io::Result<DirEntry<'a, 'b>>;
|
|
|
|
|
|
|
|
fn next(&mut self) -> Option<Self::Item> {
|
|
|
|
if self.err {
|
|
|
|
return None;
|
|
|
|
}
|
|
|
|
let r = self.read_dir_entry();
|
|
|
|
match r {
|
|
|
|
Ok(Some(e)) => Some(Ok(e)),
|
|
|
|
Ok(None) => None,
|
|
|
|
Err(err) => {
|
|
|
|
self.err = true;
|
|
|
|
Some(Err(err))
|
|
|
|
},
|
2017-09-25 04:12:38 +08:00
|
|
|
}
|
2017-09-24 01:42:09 +08:00
|
|
|
}
|
2017-09-23 02:50:41 +08:00
|
|
|
}
|
2017-09-24 08:24:42 +08:00
|
|
|
|
2017-11-08 23:03:08 +08:00
|
|
|
fn copy_short_name_part(dst: &mut [u8], src: &str) {
|
|
|
|
let mut j = 0;
|
|
|
|
for c in src.chars() {
|
|
|
|
if j == dst.len() { break; }
|
|
|
|
// replace characters allowed in long name but disallowed in short
|
|
|
|
let c2 = match c {
|
|
|
|
'.' | ' ' | '+' | ',' | ';' | '=' | '[' | ']' => '?',
|
|
|
|
_ if c < '\u{80}' => c,
|
|
|
|
_ => '?',
|
|
|
|
};
|
|
|
|
// short name is always uppercase
|
|
|
|
let upper = c2.to_uppercase().next().unwrap(); // SAFE: uppercase must return at least one character
|
|
|
|
let byte = upper as u8; // SAFE: upper is in range 0x20-0x7F
|
|
|
|
dst[j] = byte;
|
|
|
|
j += 1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
fn generate_short_name(name: &str) -> [u8;11] {
|
|
|
|
// padded by ' '
|
|
|
|
let mut short_name = [0x20u8; 11];
|
|
|
|
// find extension after last dot
|
|
|
|
match name.rfind('.') {
|
|
|
|
Some(index) => {
|
|
|
|
// extension found - copy parts before and after dot
|
|
|
|
copy_short_name_part(&mut short_name[0..8], &name[..index]);
|
|
|
|
copy_short_name_part(&mut short_name[8..11], &name[index+1..]);
|
|
|
|
},
|
|
|
|
None => {
|
|
|
|
// no extension - copy name and leave extension empty
|
|
|
|
copy_short_name_part(&mut short_name[0..8], &name);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
// FIXME: make sure short name is unique...
|
|
|
|
short_name
|
|
|
|
}
|
|
|
|
|
|
|
|
fn validate_long_name(name: &str) -> io::Result<()> {
|
|
|
|
if name.len() == 0 {
|
|
|
|
return Err(io::Error::new(ErrorKind::InvalidInput, "filename cannot be empty"));
|
|
|
|
}
|
|
|
|
if name.len() > 255 {
|
|
|
|
return Err(io::Error::new(ErrorKind::InvalidInput, "filename is too long"));
|
|
|
|
}
|
|
|
|
for c in name.chars() {
|
|
|
|
match c {
|
|
|
|
'a'...'z' | 'A'...'Z' | '0'...'9' | '\u{80}'...'\u{FFFF}' |
|
|
|
|
'$' | '%' | '\'' | '-' | '_' | '@' | '~' | '`' | '!' | '(' | ')' | '{' | '}' |
|
|
|
|
'.' | ' ' | '+' | ',' | ';' | '=' | '[' | ']' => {},
|
|
|
|
_ => return Err(io::Error::new(ErrorKind::InvalidInput, "invalid character in filename")),
|
|
|
|
}
|
|
|
|
}
|
|
|
|
Ok(())
|
2017-10-14 21:24:03 +08:00
|
|
|
}
|
|
|
|
|
2018-05-10 21:00:59 +08:00
|
|
|
#[cfg(feature = "alloc")]
|
2017-10-14 21:24:03 +08:00
|
|
|
fn lfn_checksum(short_name: &[u8]) -> u8 {
|
|
|
|
let mut chksum = 0u8;
|
|
|
|
for i in 0..11 {
|
|
|
|
chksum = (((chksum & 1) << 7) as u16 + (chksum >> 1) as u16 + short_name[i] as u16) as u8;
|
|
|
|
}
|
|
|
|
chksum
|
|
|
|
}
|
|
|
|
|
2018-05-10 21:00:59 +08:00
|
|
|
#[cfg(feature = "alloc")]
|
2017-11-08 23:03:08 +08:00
|
|
|
struct LongNameBuilder {
|
|
|
|
buf: Vec<u16>,
|
|
|
|
chksum: u8,
|
|
|
|
index: u8,
|
|
|
|
}
|
|
|
|
|
2018-05-10 21:00:59 +08:00
|
|
|
#[cfg(feature = "alloc")]
|
2017-10-14 21:24:03 +08:00
|
|
|
impl LongNameBuilder {
|
|
|
|
fn new() -> LongNameBuilder {
|
|
|
|
LongNameBuilder {
|
|
|
|
buf: Vec::<u16>::new(),
|
|
|
|
chksum: 0,
|
|
|
|
index: 0,
|
|
|
|
}
|
|
|
|
}
|
2017-10-25 23:20:27 +08:00
|
|
|
|
2017-10-14 21:24:03 +08:00
|
|
|
fn clear(&mut self) {
|
|
|
|
self.buf.clear();
|
|
|
|
self.index = 0;
|
|
|
|
}
|
2017-10-25 23:20:27 +08:00
|
|
|
|
2017-10-14 21:24:03 +08:00
|
|
|
fn to_vec(mut self) -> Vec<u16> {
|
|
|
|
if self.index == 1 {
|
|
|
|
self.truncate();
|
|
|
|
self.buf
|
|
|
|
} else {
|
2017-10-15 06:55:19 +08:00
|
|
|
warn!("unfinished LFN sequence {}", self.index);
|
2017-10-14 21:24:03 +08:00
|
|
|
Vec::<u16>::new()
|
|
|
|
}
|
|
|
|
}
|
2017-10-25 23:20:27 +08:00
|
|
|
|
2017-10-14 21:24:03 +08:00
|
|
|
fn truncate(&mut self) {
|
|
|
|
// Truncate 0 and 0xFFFF characters from LFN buffer
|
|
|
|
let mut lfn_len = self.buf.len();
|
|
|
|
loop {
|
|
|
|
if lfn_len == 0 {
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
match self.buf[lfn_len-1] {
|
|
|
|
0xFFFF | 0 => lfn_len -= 1,
|
|
|
|
_ => break,
|
|
|
|
}
|
|
|
|
}
|
|
|
|
self.buf.truncate(lfn_len);
|
|
|
|
}
|
2017-10-25 23:20:27 +08:00
|
|
|
|
2017-10-14 21:24:03 +08:00
|
|
|
fn process(&mut self, data: &DirLfnEntryData) {
|
2017-11-08 23:03:08 +08:00
|
|
|
let is_last = (data.order() & LFN_ENTRY_LAST_FLAG) != 0;
|
|
|
|
let index = data.order() & 0x1F;
|
2017-10-14 21:24:03 +08:00
|
|
|
if index == 0 {
|
|
|
|
// Corrupted entry
|
2017-11-08 23:03:08 +08:00
|
|
|
warn!("currupted lfn entry! {:x}", data.order());
|
2017-10-14 21:24:03 +08:00
|
|
|
self.clear();
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
if is_last {
|
|
|
|
// last entry is actually first entry in stream
|
|
|
|
self.index = index;
|
2017-11-08 23:03:08 +08:00
|
|
|
self.chksum = data.checksum();
|
2017-10-14 21:24:03 +08:00
|
|
|
self.buf.resize(index as usize * LFN_PART_LEN, 0);
|
2017-11-08 23:03:08 +08:00
|
|
|
} else if self.index == 0 || index != self.index - 1 || data.checksum() != self.chksum {
|
2017-10-14 21:24:03 +08:00
|
|
|
// Corrupted entry
|
2017-11-08 23:03:08 +08:00
|
|
|
warn!("currupted lfn entry! {:x} {:x} {:x} {:x}", data.order(), self.index, data.checksum(), self.chksum);
|
2017-10-14 21:24:03 +08:00
|
|
|
self.clear();
|
|
|
|
return;
|
|
|
|
} else {
|
|
|
|
// Decrement LFN index only for non-last entries
|
|
|
|
self.index -= 1;
|
|
|
|
}
|
|
|
|
let pos = LFN_PART_LEN * (index - 1) as usize;
|
|
|
|
// copy name parts into LFN buffer
|
2017-11-08 21:05:14 +08:00
|
|
|
data.copy_name_to_slice(&mut self.buf[pos..pos+13]);
|
2017-10-14 21:24:03 +08:00
|
|
|
}
|
2017-10-25 23:20:27 +08:00
|
|
|
|
2017-10-14 21:24:03 +08:00
|
|
|
fn validate_chksum(&mut self, short_name: &[u8]) {
|
|
|
|
let chksum = lfn_checksum(short_name);
|
|
|
|
if chksum != self.chksum {
|
2017-10-15 06:55:19 +08:00
|
|
|
warn!("checksum mismatch {:x} {:x} {:?}", chksum, self.chksum, short_name);
|
2017-10-14 21:24:03 +08:00
|
|
|
self.clear();
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
2017-11-08 23:03:08 +08:00
|
|
|
|
2018-05-10 21:00:59 +08:00
|
|
|
#[cfg(feature = "alloc")]
|
2017-11-08 23:03:08 +08:00
|
|
|
struct LfnEntriesGenerator<'a> {
|
|
|
|
name_parts_iter: iter::Rev<slice::Chunks<'a, u16>>,
|
|
|
|
checksum: u8,
|
|
|
|
index: usize,
|
|
|
|
num: usize,
|
|
|
|
ended: bool,
|
|
|
|
}
|
|
|
|
|
2018-05-10 21:00:59 +08:00
|
|
|
#[cfg(feature = "alloc")]
|
2017-11-08 23:03:08 +08:00
|
|
|
impl<'a> LfnEntriesGenerator<'a> {
|
|
|
|
fn new(name_utf16: &'a [u16], checksum: u8) -> Self {
|
|
|
|
let num_entries = (name_utf16.len() + LFN_PART_LEN - 1) / LFN_PART_LEN;
|
2017-11-08 23:47:12 +08:00
|
|
|
// create generator using reverse iterator over chunks - first chunk can be shorter
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2017-11-08 23:03:08 +08:00
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LfnEntriesGenerator {
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checksum,
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name_parts_iter: name_utf16.chunks(LFN_PART_LEN).rev(),
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index: 0,
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num: num_entries,
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ended: false,
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}
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}
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}
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2018-05-10 21:00:59 +08:00
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#[cfg(feature = "alloc")]
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2017-11-08 23:03:08 +08:00
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impl<'a> Iterator for LfnEntriesGenerator<'a> {
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type Item = DirLfnEntryData;
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fn next(&mut self) -> Option<Self::Item> {
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if self.ended {
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return None;
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}
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2017-11-08 23:47:12 +08:00
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// get next part from reverse iterator
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2017-11-08 23:03:08 +08:00
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match self.name_parts_iter.next() {
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Some(ref name_part) => {
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let lfn_index = self.num - self.index;
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let mut order = lfn_index as u8;
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if self.index == 0 {
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2017-11-08 23:47:12 +08:00
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// this is last name part (written as first)
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2017-11-08 23:03:08 +08:00
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order |= LFN_ENTRY_LAST_FLAG;
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}
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debug_assert!(order > 0);
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2017-11-08 23:47:12 +08:00
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// name is padded with ' '
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2017-11-08 23:03:08 +08:00
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let mut lfn_part = [0xFFFFu16; LFN_PART_LEN];
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lfn_part[..name_part.len()].copy_from_slice(&name_part);
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if name_part.len() < LFN_PART_LEN {
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2017-11-08 23:47:12 +08:00
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// name is only zero-terminated if its length is not multiplicity of LFN_PART_LEN
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2017-11-08 23:03:08 +08:00
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lfn_part[name_part.len()] = 0;
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}
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2017-11-08 23:47:12 +08:00
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// create and return new LFN entry
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2017-11-08 23:03:08 +08:00
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let mut lfn_entry = DirLfnEntryData::new(order, self.checksum);
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lfn_entry.copy_name_from_slice(&lfn_part);
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self.index += 1;
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Some(lfn_entry)
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},
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None => {
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2017-11-08 23:47:12 +08:00
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// end of name
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2017-11-08 23:03:08 +08:00
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self.ended = true;
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None
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}
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}
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}
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fn size_hint(&self) -> (usize, Option<usize>) {
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self.name_parts_iter.size_hint()
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}
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}
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2017-11-08 23:47:12 +08:00
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// name_parts_iter is ExactSizeIterator so size_hint returns one limit
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2018-05-10 21:00:59 +08:00
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#[cfg(feature = "alloc")]
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2017-11-08 23:03:08 +08:00
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impl<'a> ExactSizeIterator for LfnEntriesGenerator<'a> {}
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