Add file read methods.

This commit is contained in:
Rafał Harabień 2017-09-22 22:27:39 +02:00
parent c5ab2f94d5
commit 91ba151398
6 changed files with 208 additions and 77 deletions

93
Cargo.lock generated
View File

@ -3,6 +3,7 @@ name = "rust-fat"
version = "0.1.0" version = "0.1.0"
dependencies = [ dependencies = [
"byteorder 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)", "byteorder 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
"chrono 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
] ]
[[package]] [[package]]
@ -10,5 +11,97 @@ name = "byteorder"
version = "1.1.0" version = "1.1.0"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "chrono"
version = "0.4.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"num 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
"time 0.1.38 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "kernel32-sys"
version = "0.2.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
"winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "libc"
version = "0.2.31"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "num"
version = "0.1.40"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"num-integer 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
"num-iter 0.1.34 (registry+https://github.com/rust-lang/crates.io-index)",
"num-traits 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "num-integer"
version = "0.1.35"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"num-traits 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "num-iter"
version = "0.1.34"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"num-integer 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
"num-traits 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "num-traits"
version = "0.1.40"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "redox_syscall"
version = "0.1.31"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "time"
version = "0.1.38"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
"libc 0.2.31 (registry+https://github.com/rust-lang/crates.io-index)",
"redox_syscall 0.1.31 (registry+https://github.com/rust-lang/crates.io-index)",
"winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
name = "winapi"
version = "0.2.8"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "winapi-build"
version = "0.1.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
[metadata] [metadata]
"checksum byteorder 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ff81738b726f5d099632ceaffe7fb65b90212e8dce59d518729e7e8634032d3d" "checksum byteorder 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ff81738b726f5d099632ceaffe7fb65b90212e8dce59d518729e7e8634032d3d"
"checksum chrono 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7c20ebe0b2b08b0aeddba49c609fe7957ba2e33449882cb186a180bc60682fa9"
"checksum kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7507624b29483431c0ba2d82aece8ca6cdba9382bff4ddd0f7490560c056098d"
"checksum libc 0.2.31 (registry+https://github.com/rust-lang/crates.io-index)" = "d1419b2939a0bc44b77feb34661583c7546b532b192feab36249ab584b86856c"
"checksum num 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)" = "a311b77ebdc5dd4cf6449d81e4135d9f0e3b153839ac90e648a8ef538f923525"
"checksum num-integer 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)" = "d1452e8b06e448a07f0e6ebb0bb1d92b8890eea63288c0b627331d53514d0fba"
"checksum num-iter 0.1.34 (registry+https://github.com/rust-lang/crates.io-index)" = "7485fcc84f85b4ecd0ea527b14189281cf27d60e583ae65ebc9c088b13dffe01"
"checksum num-traits 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)" = "99843c856d68d8b4313b03a17e33c4bb42ae8f6610ea81b28abe076ac721b9b0"
"checksum redox_syscall 0.1.31 (registry+https://github.com/rust-lang/crates.io-index)" = "8dde11f18c108289bef24469638a04dce49da56084f2d50618b226e47eb04509"
"checksum time 0.1.38 (registry+https://github.com/rust-lang/crates.io-index)" = "d5d788d3aa77bc0ef3e9621256885555368b47bd495c13dd2e7413c89f845520"
"checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
"checksum winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"

View File

@ -5,3 +5,4 @@ authors = ["Rafał Harabień <rafalh1992@o2.pl>"]
[dependencies] [dependencies]
byteorder = "1" byteorder = "1"
chrono = "0.4"

View File

@ -1,11 +1,11 @@
use std::fs::File;
use std::io::prelude::*; use std::io::prelude::*;
use std::io::BufReader;
use std::io; use std::io;
use std::str; use std::str;
use std::io::{Error, ErrorKind, SeekFrom};
use byteorder::{LittleEndian, ReadBytesExt}; use byteorder::{LittleEndian, ReadBytesExt};
use fs::{FatFileSystem, FatType}; use fs::FatFileSystem;
use file::FatFile;
use std::io::Cursor;
use chrono::{DateTime, Date, TimeZone, Local};
#[derive(Debug, PartialEq)] #[derive(Debug, PartialEq)]
#[allow(dead_code)] #[allow(dead_code)]
@ -24,50 +24,74 @@ pub struct FatDirEntry {
name: [u8; 11], name: [u8; 11],
attrs: u8, attrs: u8,
reserved_0: u8, reserved_0: u8,
creation_time_0: u8, create_time_0: u8,
creation_time_1: u16, create_time_1: u16,
creation_date: u16, create_date: u16,
access_date: u16, access_date: u16,
first_cluster_hi: u16, first_cluster_hi: u16,
mod_time: u16, modify_time: u16,
mod_date: u16, modify_date: u16,
first_cluster_lo: u16, first_cluster_lo: u16,
size: u32, size: u32,
} }
pub struct FatDir { fn convert_date(dos_date: u16) -> Date<Local> {
cluster: u32, let (year, month, day) = ((dos_date >> 9) + 1980, (dos_date >> 5) & 0xF, dos_date & 0x1F);
Local.ymd(year as i32, month as u32, day as u32)
} }
impl FatDir { fn convert_date_time(dos_date: u16, dos_time: u16) -> DateTime<Local> {
pub fn new(cluster: u32) -> FatDir { let (hour, min, sec) = (dos_time >> 11, (dos_time >> 5) & 0x3F, (dos_time & 0x1F) * 2);
FatDir { convert_date(dos_date).and_hms(hour as u32, min as u32, sec as u32)
cluster: cluster, }
}
impl FatDirEntry {
pub fn get_name(&self) -> String {
return str::from_utf8(&self.name).unwrap().trim_right().to_string();
}
pub fn get_cluster(&self) -> u32 {
((self.first_cluster_hi as u32) << 16) | self.first_cluster_lo as u32
}
pub fn get_file<T: Read+Seek>(&self, fs: &FatFileSystem<T>) -> FatFile {
FatFile::new(fs.sector_from_cluster(self.get_cluster()), self.size)
}
pub fn get_size(&self) -> u32 {
self.size
}
pub fn get_create_time(&self) -> DateTime<Local> {
convert_date_time(self.create_date, self.create_time_1)
}
pub fn get_access_date(&self) -> Date<Local> {
convert_date(self.access_date)
}
pub fn get_modify_time(&self) -> DateTime<Local> {
convert_date_time(self.modify_date, self.modify_time)
} }
} }
trait DirEntry {
fn get_name(&self) -> str;
}
trait ReadDir {
fn read_dir(&mut self, dir: &FatDir) -> io::Result<Vec<FatDirEntry>>;
}
impl<T: Read+Seek> FatFileSystem<T> { impl<T: Read+Seek> FatFileSystem<T> {
pub fn read_dir(&mut self, dir: FatDir) -> io::Result<Vec<FatDirEntry>> { pub fn read_dir(&mut self, dir: &mut FatFile) -> io::Result<Vec<FatDirEntry>> {
let mut cur = Cursor::new(vec![0; 512]);
self.read(dir, cur.get_mut())?;
let mut entries = Vec::new(); let mut entries = Vec::new();
loop { loop {
let entry = read_dir_entry(&mut self.rdr)?; let entry = read_dir_entry(&mut cur)?;
if entry.name[0] == 0 { if entry.name[0] == 0 {
break; // end of dir break; // end of dir
} }
if entry.name[0] == 0xE5 { if entry.name[0] == 0xE5 {
continue; // deleted continue; // deleted
} }
let name_str = str::from_utf8(&entry.name).unwrap().trim_right(); entries.push(entry);
println!("name {} size {} cluster {}", name_str, entry.size, entry.first_cluster_lo);
} }
Ok(entries) Ok(entries)
} }
@ -80,41 +104,14 @@ fn read_dir_entry(rdr: &mut Read) -> io::Result<FatDirEntry> {
name: name, name: name,
attrs: rdr.read_u8()?, attrs: rdr.read_u8()?,
reserved_0: rdr.read_u8()?, reserved_0: rdr.read_u8()?,
creation_time_0: rdr.read_u8()?, create_time_0: rdr.read_u8()?,
creation_time_1: rdr.read_u16::<LittleEndian>()?, create_time_1: rdr.read_u16::<LittleEndian>()?,
creation_date: rdr.read_u16::<LittleEndian>()?, create_date: rdr.read_u16::<LittleEndian>()?,
access_date: rdr.read_u16::<LittleEndian>()?, access_date: rdr.read_u16::<LittleEndian>()?,
first_cluster_hi: rdr.read_u16::<LittleEndian>()?, first_cluster_hi: rdr.read_u16::<LittleEndian>()?,
mod_time: rdr.read_u16::<LittleEndian>()?, modify_time: rdr.read_u16::<LittleEndian>()?,
mod_date: rdr.read_u16::<LittleEndian>()?, modify_date: rdr.read_u16::<LittleEndian>()?,
first_cluster_lo: rdr.read_u16::<LittleEndian>()?, first_cluster_lo: rdr.read_u16::<LittleEndian>()?,
size: rdr.read_u32::<LittleEndian>()?, size: rdr.read_u32::<LittleEndian>()?,
}) })
} }
// impl FatDir {
// pub fn new(rdr: &mut Read) -> io::Result<FatDir> {
// let dir = FatDir {
// entries: Vec::new(),
// };
// read_dir_entry(rdr)?;
// Ok(dir)
// }
//
// pub fn print(&mut self) -> io::Result<()> {
// //let pos = self.rdr.seek(SeekFrom::Current(0))?;
// //println!("Reading dir at {}", pos);
// loop {
// let entry = self.read_dir_entry()?;
// if entry.name[0] == 0 {
// break; // end of dir
// }
// if entry.name[0] == 0xE5 {
// continue; // deleted
// }
// let name_str = str::from_utf8(&entry.name).unwrap().trim_right();
// println!("name {} size {} cluster {}", name_str, entry.size, entry.first_cluster_lo);
// }
// Ok(())
// }
// }

34
src/file.rs Normal file
View File

@ -0,0 +1,34 @@
use std::io::prelude::*;
use std::io;
use fs::FatFileSystem;
#[allow(dead_code)]
pub struct FatFile {
first_sector: u32,
size: u32,
offset: u32,
}
impl FatFile {
pub fn new(first_sector: u32, size: u32) -> FatFile {
FatFile { first_sector, size, offset: 0 }
}
}
impl<T: Read+Seek> FatFileSystem<T> {
pub fn file_from_cluster(&mut self, cluster: u32, size: u32) -> FatFile {
FatFile {
first_sector: self.sector_from_cluster(cluster),
size: size,
offset: 0,
}
}
pub fn read(&mut self, file: &mut FatFile, buf: &mut [u8]) -> io::Result<usize> {
self.seek_to_sector(file.first_sector as u64)?;
let size = self.rdr.read(buf)?;
file.offset += size as u32;
Ok(size)
}
}

View File

@ -1,11 +1,9 @@
use std::fs::File;
use std::io::prelude::*; use std::io::prelude::*;
use std::io::BufReader;
use std::io; use std::io;
use std::str; use std::str;
use std::io::{Error, ErrorKind, SeekFrom}; use std::io::{Error, ErrorKind, SeekFrom};
use byteorder::{LittleEndian, ReadBytesExt}; use byteorder::{LittleEndian, ReadBytesExt};
use dir::FatDir; use file::FatFile;
// FAT implementation based on: // FAT implementation based on:
// http://wiki.osdev.org/FAT // http://wiki.osdev.org/FAT
@ -16,11 +14,12 @@ pub enum FatType {
Fat12, Fat16, Fat32, ExFat Fat12, Fat16, Fat32, ExFat
} }
#[allow(dead_code)]
pub struct FatFileSystem<T: Read+Seek> { pub struct FatFileSystem<T: Read+Seek> {
pub(crate) rdr: T, pub(crate) rdr: T,
pub(crate) fat_type: FatType, pub(crate) fat_type: FatType,
pub(crate) boot: FatBootRecord, pub(crate) boot: FatBootRecord,
pub(crate) first_fat_sector: u32, first_fat_sector: u32,
pub(crate) first_data_sector: u32, pub(crate) first_data_sector: u32,
pub(crate) root_dir_sectors: u32, pub(crate) root_dir_sectors: u32,
} }
@ -198,12 +197,16 @@ impl<T: Read+Seek> FatFileSystem<T> {
((cluster - 2) * self.boot.bpb.sectors_per_cluster as u32) + self.first_data_sector ((cluster - 2) * self.boot.bpb.sectors_per_cluster as u32) + self.first_data_sector
} }
pub fn open_root_dir(&mut self) -> io::Result<FatDir> { pub(crate) fn get_root_dir_sector(&self) -> u32 {
let first_root_dir_sector = match self.fat_type { match self.fat_type {
FatType::Fat12 | FatType::Fat16 => self.first_data_sector - self.root_dir_sectors, FatType::Fat12 | FatType::Fat16 => self.first_data_sector - self.root_dir_sectors,
_ => self.sector_from_cluster(self.boot.bpb.root_cluster) _ => self.sector_from_cluster(self.boot.bpb.root_cluster)
}; }
self.seek_to_sector(first_root_dir_sector as u64)?; }
Ok(FatDir::new(0))
pub fn root_dir(&mut self) -> FatFile {
let first_root_dir_sector = self.get_root_dir_sector();
let root_dir_size = self.root_dir_sectors * self.boot.bpb.bytes_per_sector as u32;
FatFile::new(first_root_dir_sector, root_dir_size)
} }
} }

View File

@ -1,23 +1,26 @@
extern crate byteorder; extern crate byteorder;
extern crate chrono;
use std::fs::File; use std::fs::File;
use std::io::prelude::*;
use std::io::BufReader; use std::io::BufReader;
use std::io; use std::io;
use std::str; use std::str;
use std::io::{Error, ErrorKind, SeekFrom};
use byteorder::{LittleEndian, ReadBytesExt};
use fs::FatFileSystem; use fs::FatFileSystem;
mod fs; pub mod fs;
mod dir; pub mod dir;
pub mod file;
fn fat_test() -> io::Result<()> { fn fat_test() -> io::Result<()> {
let file = File::open("resources/floppy.img")?; let file = File::open("resources/floppy.img")?;
let mut buf_rdr = BufReader::new(file); let mut buf_rdr = BufReader::new(file);
let mut fs = FatFileSystem::new(&mut buf_rdr)?; let mut fs = FatFileSystem::new(&mut buf_rdr)?;
let root_dir = fs.open_root_dir()?; let mut root_dir = fs.root_dir();
fs.read_dir(root_dir)?; let entries = fs.read_dir(&mut root_dir)?;
for e in entries {
println!("{} - size {} - modified {}", e.get_name(), e.get_size(), e.get_modify_time());
//println!("name {} size {} cluster {}", name_str, entry.size, entry.first_cluster_lo);
}
Ok(()) Ok(())
} }