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Add LFN support and rename some functions.

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This commit is contained in:
Rafał Harabień 2017-09-24 22:12:38 +02:00
parent 2158c712e1
commit 840290f754
10 changed files with 172 additions and 52 deletions
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12
README.md
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@ -4,9 +4,17 @@ Rust FAT
Introduction
------------
FAT filesystem library implemented in Rust.
FAT filesystem read-only library implemented in Rust.
Supports filesystem versions: FAT12, FAT16, FAT32. Library is read-only at this point but write support is planned. LFN (Long File Name) is not supported yet.
Features:
* FAT12, FAT16, FAT32 filesystem versions,
* read directory,
* read file,
* LFN (Long File Names).
Planned features:
* write support,
* no_std environment support.
License
-------

2
examples/cat.rs
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@ -13,7 +13,7 @@ fn main() {
let buf_rdr = BufReader::new(file);
let mut fs = FatFileSystem::new(Box::new(buf_rdr)).unwrap();
let mut root_dir = fs.root_dir();
let mut file = root_dir.get_file(&env::args().nth(1).unwrap()).unwrap();
let mut file = root_dir.open_file(&env::args().nth(1).unwrap()).unwrap();
let mut buf = vec![];
file.read_to_end(&mut buf).unwrap();
print!("{}", str::from_utf8(&buf).unwrap());

2
examples/ls.rs
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@ -30,7 +30,7 @@ fn main() {
let mut dir = match env::args().nth(1) {
None => root_dir,
Some(ref path) if path == "." => root_dir,
Some(ref path) => root_dir.get_dir(&path).unwrap(),
Some(ref path) => root_dir.open_dir(&path).unwrap(),
};
let entries = dir.list().unwrap();
for e in entries {

BIN
resources/fat12.img
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resources/fat16.img
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resources/fat32.img
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7
scripts/create-test-img.sh
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@ -7,15 +7,18 @@ create_test_img() {
local blkcount=$2
local fatSize=$3
dd if=/dev/zero of="$name" bs=1024 count=$blkcount
mkfs.vfat -s 1 -F $fatSize "$name"
mkfs.vfat -s 1 -F $fatSize -n "Test!" -i 12345678 "$name"
mkdir -p mnt
sudo mount -o loop "$name" mnt -o rw,uid=$USER,gid=$USER
for i in {1..1000}; do
echo "Rust is cool!" >>"mnt/long.txt"
done
echo "Rust is cool!" >>"mnt/short.txt"
mkdir -p mnt/very/long/path
mkdir -p "mnt/very/long/path"
echo "Rust is cool!" >>"mnt/very/long/path/test.txt"
mkdir -p "mnt/very-long-dir-name"
echo "Rust is cool!" >>"mnt/very-long-dir-name/very-long-file-name.txt"
sudo umount mnt
}

113
src/dir.rs
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@ -2,7 +2,7 @@ use std::ascii::AsciiExt;
use std::fmt;
use std::io::prelude::*;
use std::io;
use std::io::{ErrorKind, SeekFrom};
use std::io::{Cursor, ErrorKind, SeekFrom};
use std::str;
use byteorder::{LittleEndian, ReadBytesExt};
use chrono::{DateTime, Date, TimeZone, Local};
@ -11,6 +11,7 @@ use fs::{FatSharedStateRef, ReadSeek};
use file::FatFile;
bitflags! {
#[derive(Default)]
pub struct FatFileAttributes: u8 {
const READ_ONLY = 0x01;
const HIDDEN = 0x02;
@ -24,8 +25,8 @@ bitflags! {
}
#[allow(dead_code)]
#[derive(Clone, Copy, Debug)]
pub struct FatDirEntryData {
#[derive(Clone, Debug, Default)]
struct FatDirFileEntryData {
name: [u8; 11],
attrs: FatFileAttributes,
reserved_0: u8,
@ -40,19 +41,47 @@ pub struct FatDirEntryData {
size: u32,
}
#[allow(dead_code)]
#[derive(Clone, Debug, Default)]
struct FatDirLfnEntryData {
order: u8,
name_0: [u16; 5],
attrs: FatFileAttributes,
entry_type: u8,
checksum: u8,
name_1: [u16; 6],
reserved_0: u16,
name_2: [u16; 2],
}
#[derive(Clone, Debug)]
enum FatDirEntryData {
File(FatDirFileEntryData),
Lfn(FatDirLfnEntryData),
}
#[derive(Clone)]
pub struct FatDirEntry {
data: FatDirEntryData,
data: FatDirFileEntryData,
lfn: Vec<u16>,
state: FatSharedStateRef,
}
impl FatDirEntry {
pub fn file_name(&self) -> String {
pub fn short_file_name(&self) -> String {
let name = str::from_utf8(&self.data.name[0..8]).unwrap().trim_right();
let ext = str::from_utf8(&self.data.name[8..11]).unwrap().trim_right();
if ext == "" { name.to_string() } else { format!("{}.{}", name, ext) }
}
pub fn file_name(&self) -> String {
if self.lfn.len() > 0 {
String::from_utf16(&self.lfn).unwrap()
} else {
self.short_file_name()
}
}
pub fn attributes(&self) -> FatFileAttributes {
self.data.attrs
}
@ -141,7 +170,21 @@ impl FatDir {
let mut name = [0; 11];
self.rdr.read(&mut name)?;
let attrs = FatFileAttributes::from_bits(self.rdr.read_u8()?).expect("invalid attributes");
Ok(FatDirEntryData {
if attrs == FatFileAttributes::LFN {
let mut data = FatDirLfnEntryData {
attrs, ..Default::default()
};
let mut cur = Cursor::new(&name);
data.order = cur.read_u8()?;
cur.read_u16_into::<LittleEndian>(&mut data.name_0)?;
data.entry_type = self.rdr.read_u8()?;
data.checksum = self.rdr.read_u8()?;
self.rdr.read_u16_into::<LittleEndian>(&mut data.name_1)?;
data.reserved_0 = self.rdr.read_u16::<LittleEndian>()?;
self.rdr.read_u16_into::<LittleEndian>(&mut data.name_2)?;
Ok(FatDirEntryData::Lfn(data))
} else {
let data = FatDirFileEntryData {
name,
attrs,
reserved_0: self.rdr.read_u8()?,
@ -154,7 +197,9 @@ impl FatDir {
modify_date: self.rdr.read_u16::<LittleEndian>()?,
first_cluster_lo: self.rdr.read_u16::<LittleEndian>()?,
size: self.rdr.read_u32::<LittleEndian>()?,
})
};
Ok(FatDirEntryData::File(data))
}
}
fn split_path<'a>(path: &'a str) -> (&'a str, Option<&'a str>) {
@ -174,20 +219,20 @@ impl FatDir {
Err(io::Error::new(ErrorKind::NotFound, "file not found"))
}
pub fn get_dir(&mut self, path: &str) -> io::Result<FatDir> {
pub fn open_dir(&mut self, path: &str) -> io::Result<FatDir> {
let (name, rest_opt) = Self::split_path(path);
let e = self.find_entry(name)?;
match rest_opt {
Some(rest) => e.to_dir().get_dir(rest),
Some(rest) => e.to_dir().open_dir(rest),
None => Ok(e.to_dir())
}
}
pub fn get_file(&mut self, path: &str) -> io::Result<FatFile> {
pub fn open_file(&mut self, path: &str) -> io::Result<FatFile> {
let (name, rest_opt) = Self::split_path(path);
let e = self.find_entry(name)?;
match rest_opt {
Some(rest) => e.to_dir().get_file(rest),
Some(rest) => e.to_dir().open_file(rest),
None => Ok(e.to_file())
}
}
@ -197,25 +242,61 @@ impl Iterator for FatDir {
type Item = io::Result<FatDirEntry>;
fn next(&mut self) -> Option<io::Result<FatDirEntry>> {
let mut lfn_buf = Vec::<u16>::new();
loop {
let res = self.read_dir_entry_data();
let data = match res {
Ok(data) => data,
Err(err) => return Some(Err(err)),
};
match data {
FatDirEntryData::File(data) => {
// Check if this is end of dif
if data.name[0] == 0 {
return None; // end of dir
return None;
}
if data.name[0] == 0xE5 {
continue; // deleted
// Check if this is deleted or volume ID entry
if data.name[0] == 0xE5 || data.attrs.contains(FatFileAttributes::VOLUME_ID) {
lfn_buf.clear();
continue;
}
if data.attrs == FatFileAttributes::LFN {
continue; // FIXME: support LFN
// Truncate 0 and 0xFFFF characters from LFN buffer
let mut lfn_len = lfn_buf.len();
loop {
if lfn_len == 0 {
break;
}
match lfn_buf[lfn_len-1] {
0xFFFF | 0 => lfn_len -= 1,
_ => break,
}
}
lfn_buf.truncate(lfn_len);
return Some(Ok(FatDirEntry {
data,
lfn: lfn_buf,
state: self.state.clone(),
}));
},
FatDirEntryData::Lfn(data) => {
// Check if this is deleted entry
if data.order == 0xE5 {
lfn_buf.clear();
continue;
}
const LFN_PART_LEN: usize = 13;
let index = (data.order & 0x1F) - 1;
let pos = LFN_PART_LEN * index as usize;
// resize LFN buffer to have enough space for entire name
if lfn_buf.len() < pos + LFN_PART_LEN {
lfn_buf.resize(pos + LFN_PART_LEN, 0);
}
// copy name parts into LFN buffer
lfn_buf[pos+0..pos+5].clone_from_slice(&data.name_0);
lfn_buf[pos+5..pos+11].clone_from_slice(&data.name_1);
lfn_buf[pos+11..pos+13].clone_from_slice(&data.name_2);
}
};
}
}
}

6
src/fs.rs
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@ -154,15 +154,15 @@ impl FatFileSystem {
})
}
pub fn get_type(&self) -> FatType {
pub fn fat_type(&self) -> FatType {
self.state.borrow().fat_type
}
pub fn get_volume_id(&self) -> u32 {
pub fn volume_id(&self) -> u32 {
self.state.borrow().boot.bpb.volume_id
}
pub fn get_volume_label(&self) -> String {
pub fn volume_label(&self) -> String {
str::from_utf8(&self.state.borrow().boot.bpb.volume_label).unwrap().trim_right().to_string()
}

42
tests/integration-test.rs
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@ -5,7 +5,7 @@ use std::io::{BufReader, SeekFrom};
use std::io::prelude::*;
use std::str;
use rfat::FatFileSystem;
use rfat::{FatFileSystem, FatType};
const TEST_TEXT: &'static str = "Rust is cool!\n";
const FAT12_IMG: &'static str = "resources/fat12.img";
@ -21,8 +21,10 @@ fn open_fs(filename: &str) -> FatFileSystem {
fn test_root_dir(mut fs: FatFileSystem) {
let mut root_dir = fs.root_dir();
let entries = root_dir.list().unwrap();
let short_names = entries.iter().map(|e| e.short_file_name()).collect::<Vec<String>>();
assert_eq!(short_names, ["LONG.TXT", "SHORT.TXT", "VERY", "VERY-L~1"]);
let names = entries.iter().map(|e| e.file_name()).collect::<Vec<String>>();
assert_eq!(names, ["LONG.TXT", "SHORT.TXT", "VERY"]);
assert_eq!(names, ["long.txt", "short.txt", "very", "very-long-dir-name"]);
// Try read again
let entries = root_dir.list().unwrap();
let names2 = entries.iter().map(|e| e.file_name()).collect::<Vec<String>>();
@ -46,7 +48,7 @@ fn test_root_dir_fat32() {
fn test_read_seek_short_file(mut fs: FatFileSystem) {
let mut root_dir = fs.root_dir();
let mut short_file = root_dir.get_file("short.txt").unwrap();
let mut short_file = root_dir.open_file("short.txt").unwrap();
let mut buf = Vec::new();
short_file.read_to_end(&mut buf).unwrap();
assert_eq!(str::from_utf8(&buf).unwrap(), TEST_TEXT);
@ -74,7 +76,7 @@ fn test_read_seek_short_file_fat32() {
fn test_read_long_file(mut fs: FatFileSystem) {
let mut root_dir = fs.root_dir();
let mut long_file = root_dir.get_file("long.txt").unwrap();
let mut long_file = root_dir.open_file("long.txt").unwrap();
let mut buf = Vec::new();
long_file.read_to_end(&mut buf).unwrap();
assert_eq!(str::from_utf8(&buf).unwrap(), TEST_TEXT.repeat(1000));
@ -103,10 +105,10 @@ fn test_read_long_file_fat32() {
fn test_get_dir_by_path(mut fs: FatFileSystem) {
let mut root_dir = fs.root_dir();
let mut dir = root_dir.get_dir("very/long/path/").unwrap();
let mut dir = root_dir.open_dir("very/long/path/").unwrap();
let entries = dir.list().unwrap();
let names = entries.iter().map(|e| e.file_name()).collect::<Vec<String>>();
assert_eq!(names, [".", "..", "TEST.TXT"]);
assert_eq!(names, [".", "..", "test.txt"]);
}
#[test]
@ -126,7 +128,12 @@ fn test_get_dir_by_path_fat32() {
fn test_get_file_by_path(mut fs: FatFileSystem) {
let mut root_dir = fs.root_dir();
let mut file = root_dir.get_file("very/long/path/test.txt").unwrap();
let mut file = root_dir.open_file("very/long/path/test.txt").unwrap();
let mut buf = Vec::new();
file.read_to_end(&mut buf).unwrap();
assert_eq!(str::from_utf8(&buf).unwrap(), TEST_TEXT);
let mut file = root_dir.open_file("very-long-dir-name/very-long-file-name.txt").unwrap();
let mut buf = Vec::new();
file.read_to_end(&mut buf).unwrap();
assert_eq!(str::from_utf8(&buf).unwrap(), TEST_TEXT);
@ -146,3 +153,24 @@ fn test_get_file_by_path_fat16() {
fn test_get_file_by_path_fat32() {
test_get_file_by_path(open_fs(FAT32_IMG))
}
fn test_volume_metadata(fs: FatFileSystem, fat_type: FatType) {
assert_eq!(fs.volume_id(), 0x12345678);
assert_eq!(fs.volume_label(), "Test!");
assert_eq!(fs.fat_type(), fat_type);
}
#[test]
fn test_volume_metadata_fat12() {
test_volume_metadata(open_fs(FAT12_IMG), FatType::Fat12)
}
#[test]
fn test_volume_metadata_fat16() {
test_volume_metadata(open_fs(FAT16_IMG), FatType::Fat16)
}
#[test]
fn test_volume_metadata_fat32() {
test_volume_metadata(open_fs(FAT32_IMG), FatType::Fat32)
}