M-Labs/rust-fatfs
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Use references instead of Rc for shared state.

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This commit is contained in:
Rafał Harabień 2017-09-27 14:05:58 +02:00
parent 840290f754
commit 4feeb3eead
7 changed files with 134 additions and 107 deletions
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4
examples/cat.rs
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@ -10,8 +10,8 @@ use rfat::FatFileSystem;
fn main() {
let file = File::open("resources/fat32.img").unwrap();
let buf_rdr = BufReader::new(file);
let mut fs = FatFileSystem::new(Box::new(buf_rdr)).unwrap();
let mut buf_rdr = BufReader::new(file);
let fs = FatFileSystem::new(&mut buf_rdr).unwrap();
let mut root_dir = fs.root_dir();
let mut file = root_dir.open_file(&env::args().nth(1).unwrap()).unwrap();
let mut buf = vec![];

4
examples/ls.rs
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@ -24,8 +24,8 @@ fn format_file_size(size: u64) -> String {
fn main() {
let file = File::open("resources/fat32.img").unwrap();
let buf_rdr = BufReader::new(file);
let mut fs = FatFileSystem::new(Box::new(buf_rdr)).unwrap();
let mut buf_rdr = BufReader::new(file);
let fs = FatFileSystem::new(&mut buf_rdr).unwrap();
let mut root_dir = fs.root_dir();
let mut dir = match env::args().nth(1) {
None => root_dir,

75
src/dir.rs
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@ -7,9 +7,34 @@ use std::str;
use byteorder::{LittleEndian, ReadBytesExt};
use chrono::{DateTime, Date, TimeZone, Local};
use fs::{FatSharedStateRef, ReadSeek};
use fs::{FatSharedStateRef, FatSlice};
use file::FatFile;
pub(crate) enum FatDirReader<'a, 'b: 'a> {
File(FatFile<'a, 'b>),
Root(FatSlice<'a, 'b>),
}
impl <'a, 'b> Read for FatDirReader<'a, 'b> {
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
match self {
&mut FatDirReader::File(ref mut file) => file.read(buf),
&mut FatDirReader::Root(ref mut raw) => raw.read(buf),
}
}
}
impl <'a, 'b> Seek for FatDirReader<'a, 'b> {
fn seek(&mut self, pos: SeekFrom) -> io::Result<u64> {
match self {
&mut FatDirReader::File(ref mut file) => file.seek(pos),
&mut FatDirReader::Root(ref mut raw) => raw.seek(pos),
}
}
}
bitflags! {
#[derive(Default)]
pub struct FatFileAttributes: u8 {
@ -61,13 +86,13 @@ enum FatDirEntryData {
}
#[derive(Clone)]
pub struct FatDirEntry {
pub struct FatDirEntry<'a, 'b: 'a> {
data: FatDirFileEntryData,
lfn: Vec<u16>,
state: FatSharedStateRef,
state: FatSharedStateRef<'a, 'b>,
}
impl FatDirEntry {
impl <'a, 'b> FatDirEntry<'a, 'b> {
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();
@ -98,19 +123,19 @@ impl FatDirEntry {
((self.data.first_cluster_hi as u32) << 16) | self.data.first_cluster_lo as u32
}
pub fn to_file(&self) -> FatFile {
pub fn to_file(&self) -> FatFile<'a, 'b> {
if self.is_dir() {
panic!("This is a directory");
}
FatFile::new(self.first_cluster(), Some(self.data.size), self.state.clone())
FatFile::new(self.first_cluster(), Some(self.data.size), self.state)
}
pub fn to_dir(&self) -> FatDir {
pub fn to_dir(&self) -> FatDir<'a, 'b> {
if !self.is_dir() {
panic!("This is a file");
}
let file = FatFile::new(self.first_cluster(), None, self.state.clone());
FatDir::new(Box::new(file), self.state.clone())
let file = FatFile::new(self.first_cluster(), None, self.state);
FatDir::new(FatDirReader::File(file), self.state)
}
pub fn len(&self) -> u64 {
@ -136,28 +161,28 @@ impl FatDirEntry {
fn convert_date_time(dos_date: u16, dos_time: u16) -> DateTime<Local> {
let (hour, min, sec) = (dos_time >> 11, (dos_time >> 5) & 0x3F, (dos_time & 0x1F) * 2);
Self::convert_date(dos_date).and_hms(hour as u32, min as u32, sec as u32)
FatDirEntry::convert_date(dos_date).and_hms(hour as u32, min as u32, sec as u32)
}
}
impl fmt::Debug for FatDirEntry {
impl <'a, 'b> fmt::Debug for FatDirEntry<'a, 'b> {
fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
self.data.fmt(f)
}
}
pub struct FatDir {
rdr: Box<ReadSeek>,
state: FatSharedStateRef,
pub struct FatDir<'a, 'b: 'a> {
rdr: FatDirReader<'a, 'b>,
state: FatSharedStateRef<'a, 'b>,
}
impl FatDir {
impl <'a, 'b> FatDir<'a, 'b> {
pub(crate) fn new(rdr: Box<ReadSeek>, state: FatSharedStateRef) -> FatDir {
pub(crate) fn new(rdr: FatDirReader<'a, 'b>, state: FatSharedStateRef<'a, 'b>) -> FatDir<'a, 'b> {
FatDir { rdr, state }
}
pub fn list(&mut self) -> io::Result<Vec<FatDirEntry>> {
pub fn list(&mut self) -> io::Result<Vec<FatDirEntry<'a, 'b>>> {
self.rewind();
Ok(self.map(|x| x.unwrap()).collect())
}
@ -202,15 +227,15 @@ impl FatDir {
}
}
fn split_path<'a>(path: &'a str) -> (&'a str, Option<&'a str>) {
fn split_path<'c>(path: &'c str) -> (&'c str, Option<&'c str>) {
let mut path_split = path.trim_matches('/').splitn(2, "/");
let comp = path_split.next().unwrap();
let rest_opt = path_split.next();
(comp, rest_opt)
}
fn find_entry(&mut self, name: &str) -> io::Result<FatDirEntry> {
let entries: Vec<FatDirEntry> = self.list()?;
fn find_entry(&mut self, name: &str) -> io::Result<FatDirEntry<'a, 'b>> {
let entries: Vec<FatDirEntry<'a, 'b>> = self.list()?;
for e in entries {
if e.file_name().eq_ignore_ascii_case(name) {
return Ok(e);
@ -219,7 +244,7 @@ impl FatDir {
Err(io::Error::new(ErrorKind::NotFound, "file not found"))
}
pub fn open_dir(&mut self, path: &str) -> io::Result<FatDir> {
pub fn open_dir(&mut self, path: &str) -> io::Result<FatDir<'a, 'b>> {
let (name, rest_opt) = Self::split_path(path);
let e = self.find_entry(name)?;
match rest_opt {
@ -228,7 +253,7 @@ impl FatDir {
}
}
pub fn open_file(&mut self, path: &str) -> io::Result<FatFile> {
pub fn open_file(&mut self, path: &str) -> io::Result<FatFile<'a, 'b>> {
let (name, rest_opt) = Self::split_path(path);
let e = self.find_entry(name)?;
match rest_opt {
@ -238,10 +263,10 @@ impl FatDir {
}
}
impl Iterator for FatDir {
type Item = io::Result<FatDirEntry>;
impl <'a, 'b> Iterator for FatDir<'a, 'b> {
type Item = io::Result<FatDirEntry<'a, 'b>>;
fn next(&mut self) -> Option<io::Result<FatDirEntry>> {
fn next(&mut self) -> Option<io::Result<FatDirEntry<'a, 'b>>> {
let mut lfn_buf = Vec::<u16>::new();
loop {
let res = self.read_dir_entry_data();

12
src/file.rs
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@ -6,16 +6,16 @@ use std::io;
use fs::FatSharedStateRef;
pub struct FatFile {
pub struct FatFile<'a, 'b: 'a> {
first_cluster: u32,
size: Option<u32>,
offset: u32,
current_cluster: Option<u32>,
state: FatSharedStateRef,
state: FatSharedStateRef<'a, 'b>,
}
impl FatFile {
pub(crate) fn new(first_cluster: u32, size: Option<u32>, state: FatSharedStateRef) -> FatFile {
impl <'a, 'b> FatFile<'a, 'b> {
pub(crate) fn new(first_cluster: u32, size: Option<u32>, state: FatSharedStateRef<'a, 'b>) -> Self {
FatFile {
first_cluster, size, state,
current_cluster: Some(first_cluster),
@ -24,7 +24,7 @@ impl FatFile {
}
}
impl Read for FatFile {
impl <'a, 'b> Read for FatFile<'a, 'b> {
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
let mut buf_offset: usize = 0;
let cluster_size = self.state.borrow().get_cluster_size();
@ -55,7 +55,7 @@ impl Read for FatFile {
}
}
impl Seek for FatFile {
impl <'a, 'b> Seek for FatFile<'a, 'b> {
fn seek(&mut self, pos: SeekFrom) -> io::Result<u64> {
let new_offset = match pos {
SeekFrom::Current(x) => self.offset as i64 + x,

84
src/fs.rs
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@ -1,15 +1,13 @@
use std::cell::RefCell;
use core::cell::RefCell;
use std::cmp;
use std::io::prelude::*;
use std::io::{Error, ErrorKind};
use std::io::SeekFrom;
use std::io::{Error, ErrorKind, SeekFrom};
use std::io;
use std::str;
use std::rc::Rc;
use byteorder::{LittleEndian, ReadBytesExt};
use file::FatFile;
use dir::FatDir;
use dir::{FatDirReader, FatDir};
use table::{FatTable, FatTable12, FatTable16, FatTable32};
// FAT implementation based on:
@ -24,17 +22,17 @@ pub enum FatType {
pub trait ReadSeek: Read + Seek {}
impl<T> ReadSeek for T where T: Read + Seek {}
pub(crate) struct FatSharedState {
pub rdr: Box<ReadSeek>,
pub fat_type: FatType,
pub boot: FatBootRecord,
pub first_fat_sector: u32,
pub first_data_sector: u32,
pub root_dir_sectors: u32,
pub table: Box<FatTable>,
pub(crate) struct FatSharedState<'a> {
pub(crate) rdr: &'a mut ReadSeek,
pub(crate) fat_type: FatType,
pub(crate) boot: FatBootRecord,
pub(crate) first_fat_sector: u32,
pub(crate) first_data_sector: u32,
pub(crate) root_dir_sectors: u32,
pub(crate) table: Box<FatTable>,
}
impl FatSharedState {
impl <'a> FatSharedState<'a> {
pub(crate) fn offset_from_sector(&self, sector: u32) -> u64 {
(sector as u64) * self.boot.bpb.bytes_per_sector as u64
}
@ -52,12 +50,6 @@ impl FatSharedState {
}
}
pub(crate) type FatSharedStateRef = Rc<RefCell<FatSharedState>>;
pub struct FatFileSystem {
pub(crate) state: FatSharedStateRef,
}
#[allow(dead_code)]
#[derive(Default, Debug, Clone)]
pub(crate) struct FatBiosParameterBlock {
@ -111,12 +103,19 @@ impl Default for FatBootRecord {
}
}
impl FatFileSystem {
pub(crate) type FatSharedStateCell<'a> = RefCell<FatSharedState<'a>>;
pub(crate) type FatSharedStateRef<'a, 'b: 'a> = &'a RefCell<FatSharedState<'b>>;
pub struct FatFileSystem<'a> {
pub(crate) state: FatSharedStateCell<'a>,
}
impl <'a> FatFileSystem<'a> {
pub fn new<T: ReadSeek + 'static>(mut rdr: Box<T>) -> io::Result<FatFileSystem> {
pub fn new<T: ReadSeek>(mut rdr: &'a mut T) -> io::Result<FatFileSystem<'a>> {
let boot = Self::read_boot_record(&mut *rdr)?;
if boot.boot_sig != [0x55, 0xAA] {
return Err(Error::new(ErrorKind::Other, "invalid signature"));
return Err(Error::new(ErrorKind::Other, "invBox::newalid signature"));
}
let total_sectors = if boot.bpb.total_sectors_16 == 0 { boot.bpb.total_sectors_32 } else { boot.bpb.total_sectors_16 as u32 };
@ -132,9 +131,9 @@ impl FatFileSystem {
rdr.seek(SeekFrom::Start(fat_offset as u64))?;
let table_size_bytes = table_size * boot.bpb.bytes_per_sector as u32;
let table: Box<FatTable> = match fat_type {
FatType::Fat12 => Box::new(FatTable12::read(&mut rdr, table_size_bytes as usize)?),
FatType::Fat16 => Box::new(FatTable16::read(&mut rdr, table_size_bytes as usize)?),
FatType::Fat32 => Box::new(FatTable32::read(&mut rdr, table_size_bytes as usize)?),
FatType::Fat12 => Box::new(FatTable12::read(rdr, table_size_bytes as usize)?),
FatType::Fat16 => Box::new(FatTable16::read(rdr, table_size_bytes as usize)?),
FatType::Fat32 => Box::new(FatTable32::read(rdr, table_size_bytes as usize)?),
_ => panic!("TODO: exfat")
};
@ -148,9 +147,8 @@ impl FatFileSystem {
table,
};
let state_rc = Rc::new(RefCell::new(state));
Ok(FatFileSystem {
state: state_rc,
state: RefCell::new(state),
})
}
@ -166,14 +164,16 @@ impl FatFileSystem {
str::from_utf8(&self.state.borrow().boot.bpb.volume_label).unwrap().trim_right().to_string()
}
pub fn root_dir(&mut self) -> FatDir {
let state = self.state.borrow();
let root_rdr: Box<ReadSeek> = match state.fat_type {
FatType::Fat12 | FatType::Fat16 => Box::new(FatSlice::from_sectors(
state.first_data_sector - state.root_dir_sectors, state.root_dir_sectors, self.state.clone())),
_ => Box::new(FatFile::new(state.boot.bpb.root_cluster, None, self.state.clone())) // FIXME
pub fn root_dir<'b>(&'b self) -> FatDir<'b, 'a> {
let root_rdr = {
let state = self.state.borrow();
match state.fat_type {
FatType::Fat12 | FatType::Fat16 => FatDirReader::Root(FatSlice::from_sectors(
state.first_data_sector - state.root_dir_sectors, state.root_dir_sectors, &self.state)),
_ => FatDirReader::File(FatFile::new(state.boot.bpb.root_cluster, None, &self.state)),
}
};
FatDir::new(root_rdr, self.state.clone())
FatDir::new(root_rdr, &self.state)
}
fn read_bpb(rdr: &mut Read) -> io::Result<FatBiosParameterBlock> {
@ -248,25 +248,25 @@ impl FatFileSystem {
}
}
struct FatSlice {
pub(crate) struct FatSlice<'a, 'b: 'a> {
begin: u64,
size: u64,
offset: u64,
state: FatSharedStateRef,
state: FatSharedStateRef<'a, 'b>,
}
impl FatSlice {
pub(crate) fn new(begin: u64, size: u64, state: FatSharedStateRef) -> FatSlice {
impl <'a, 'b> FatSlice<'a, 'b> {
pub(crate) fn new(begin: u64, size: u64, state: FatSharedStateRef<'a, 'b>) -> Self {
FatSlice { begin, size, state, offset: 0 }
}
pub(crate) fn from_sectors(first_sector: u32, sectors_count: u32, state: FatSharedStateRef) -> FatSlice {
pub(crate) fn from_sectors(first_sector: u32, sectors_count: u32, state: FatSharedStateRef<'a, 'b>) -> Self {
let bytes_per_sector = state.borrow().boot.bpb.bytes_per_sector as u64;
Self::new(first_sector as u64 * bytes_per_sector, sectors_count as u64 * bytes_per_sector, state)
}
}
impl Read for FatSlice {
impl <'a, 'b> Read for FatSlice<'a, 'b> {
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
let offset = self.begin + self.offset;
let read_size = cmp::min((self.size - self.offset) as usize, buf.len());
@ -278,7 +278,7 @@ impl Read for FatSlice {
}
}
impl Seek for FatSlice {
impl <'a, 'b> Seek for FatSlice<'a, 'b> {
fn seek(&mut self, pos: SeekFrom) -> io::Result<u64> {
let new_offset = match pos {
SeekFrom::Current(x) => self.offset as i64 + x,

1
src/lib.rs
View File

@ -3,6 +3,7 @@
extern crate byteorder;
extern crate chrono;
extern crate core;
#[macro_use]
extern crate bitflags;

61
tests/integration-test.rs
View File

@ -7,18 +7,19 @@ use std::str;
use rfat::{FatFileSystem, FatType};
const TEST_TEXT: &'static str = "Rust is cool!\n";
const FAT12_IMG: &'static str = "resources/fat12.img";
const FAT16_IMG: &'static str = "resources/fat16.img";
const FAT32_IMG: &'static str = "resources/fat32.img";
const TEST_TEXT: &str = "Rust is cool!\n";
const FAT12_IMG: &str = "resources/fat12.img";
const FAT16_IMG: &str = "resources/fat16.img";
const FAT32_IMG: &str = "resources/fat32.img";
fn open_fs(filename: &str) -> FatFileSystem {
fn call_with_fs(f: &Fn(FatFileSystem) -> (), filename: &str) {
let file = File::open(filename).unwrap();
let buf_rdr = BufReader::new(file);
FatFileSystem::new(Box::new(buf_rdr)).unwrap()
let mut buf_rdr = BufReader::new(file);
let fs = FatFileSystem::new(&mut buf_rdr).unwrap();
f(fs);
}
fn test_root_dir(mut fs: FatFileSystem) {
fn test_root_dir(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>>();
@ -33,20 +34,20 @@ fn test_root_dir(mut fs: FatFileSystem) {
#[test]
fn test_root_dir_fat12() {
test_root_dir(open_fs(FAT12_IMG));
call_with_fs(&test_root_dir, FAT12_IMG)
}
#[test]
fn test_root_dir_fat16() {
test_root_dir(open_fs(FAT16_IMG));
call_with_fs(&test_root_dir, FAT16_IMG)
}
#[test]
fn test_root_dir_fat32() {
test_root_dir(open_fs(FAT32_IMG));
call_with_fs(&test_root_dir, FAT32_IMG)
}
fn test_read_seek_short_file(mut fs: FatFileSystem) {
fn test_read_seek_short_file(fs: FatFileSystem) {
let mut root_dir = fs.root_dir();
let mut short_file = root_dir.open_file("short.txt").unwrap();
let mut buf = Vec::new();
@ -61,20 +62,20 @@ fn test_read_seek_short_file(mut fs: FatFileSystem) {
#[test]
fn test_read_seek_short_file_fat12() {
test_read_seek_short_file(open_fs(FAT12_IMG))
call_with_fs(&test_read_seek_short_file, FAT12_IMG)
}
#[test]
fn test_read_seek_short_file_fat16() {
test_read_seek_short_file(open_fs(FAT16_IMG))
call_with_fs(&test_read_seek_short_file, FAT16_IMG)
}
#[test]
fn test_read_seek_short_file_fat32() {
test_read_seek_short_file(open_fs(FAT32_IMG))
call_with_fs(&test_read_seek_short_file, FAT32_IMG)
}
fn test_read_long_file(mut fs: FatFileSystem) {
fn test_read_long_file(fs: FatFileSystem) {
let mut root_dir = fs.root_dir();
let mut long_file = root_dir.open_file("long.txt").unwrap();
let mut buf = Vec::new();
@ -90,20 +91,20 @@ fn test_read_long_file(mut fs: FatFileSystem) {
#[test]
fn test_read_long_file_fat12() {
test_read_long_file(open_fs(FAT12_IMG))
call_with_fs(&test_read_long_file, FAT12_IMG)
}
#[test]
fn test_read_long_file_fat16() {
test_read_long_file(open_fs(FAT16_IMG))
call_with_fs(&test_read_long_file, FAT16_IMG)
}
#[test]
fn test_read_long_file_fat32() {
test_read_long_file(open_fs(FAT32_IMG))
call_with_fs(&test_read_long_file, FAT32_IMG)
}
fn test_get_dir_by_path(mut fs: FatFileSystem) {
fn test_get_dir_by_path(fs: FatFileSystem) {
let mut root_dir = fs.root_dir();
let mut dir = root_dir.open_dir("very/long/path/").unwrap();
let entries = dir.list().unwrap();
@ -113,20 +114,20 @@ fn test_get_dir_by_path(mut fs: FatFileSystem) {
#[test]
fn test_get_dir_by_path_fat12() {
test_get_dir_by_path(open_fs(FAT12_IMG))
call_with_fs(&test_get_dir_by_path, FAT12_IMG)
}
#[test]
fn test_get_dir_by_path_fat16() {
test_get_dir_by_path(open_fs(FAT16_IMG))
call_with_fs(&test_get_dir_by_path, FAT16_IMG)
}
#[test]
fn test_get_dir_by_path_fat32() {
test_get_dir_by_path(open_fs(FAT32_IMG))
call_with_fs(&test_get_dir_by_path, FAT32_IMG)
}
fn test_get_file_by_path(mut fs: FatFileSystem) {
fn test_get_file_by_path(fs: FatFileSystem) {
let mut root_dir = fs.root_dir();
let mut file = root_dir.open_file("very/long/path/test.txt").unwrap();
let mut buf = Vec::new();
@ -141,17 +142,17 @@ fn test_get_file_by_path(mut fs: FatFileSystem) {
#[test]
fn test_get_file_by_path_fat12() {
test_get_file_by_path(open_fs(FAT12_IMG))
call_with_fs(&test_get_file_by_path, FAT12_IMG)
}
#[test]
fn test_get_file_by_path_fat16() {
test_get_file_by_path(open_fs(FAT16_IMG))
call_with_fs(&test_get_file_by_path, FAT16_IMG)
}
#[test]
fn test_get_file_by_path_fat32() {
test_get_file_by_path(open_fs(FAT32_IMG))
call_with_fs(&test_get_file_by_path, FAT32_IMG)
}
fn test_volume_metadata(fs: FatFileSystem, fat_type: FatType) {
@ -162,15 +163,15 @@ fn test_volume_metadata(fs: FatFileSystem, fat_type: FatType) {
#[test]
fn test_volume_metadata_fat12() {
test_volume_metadata(open_fs(FAT12_IMG), FatType::Fat12)
call_with_fs(&|fs| test_volume_metadata(fs, FatType::Fat12), FAT12_IMG)
}
#[test]
fn test_volume_metadata_fat16() {
test_volume_metadata(open_fs(FAT16_IMG), FatType::Fat16)
call_with_fs(&|fs| test_volume_metadata(fs, FatType::Fat16), FAT16_IMG)
}
#[test]
fn test_volume_metadata_fat32() {
test_volume_metadata(open_fs(FAT32_IMG), FatType::Fat32)
call_with_fs(&|fs| test_volume_metadata(fs, FatType::Fat32), FAT32_IMG)
}