1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
use core::mem;
use core::mem::transmute;
use alloc::rc::Rc;
use super::clusters::SectorRef;
use super::entry::with_context;
use super::entry::{ClusterEntry, TouchOption};
use super::file::File;
use crate::error::Error;
use crate::region::data::entry_type::{EntryType, RawEntryType};
use crate::region::data::entryset::primary::{DateTime, FileDirectory};
use crate::region::data::entryset::secondary::{Filename, Secondary, StreamExtension};
use crate::region::data::entryset::RawEntry;
use crate::upcase_table::UpcaseTable;
#[derive(Clone, Default)]
pub struct EntrySet {
pub name: heapless::String<255>,
pub file_directory: FileDirectory,
pub stream_extension: Secondary<StreamExtension>,
pub(crate) sector_ref: SectorRef,
pub(crate) entry_index: usize,
}
pub struct Directory<IO> {
pub(crate) entry: ClusterEntry<IO>,
pub(crate) upcase_table: Rc<UpcaseTable>,
}
pub enum FileOrDirectory<IO> {
File(File<IO>),
Directory(Directory<IO>),
}
#[deasync::deasync]
impl<E, IO: crate::io::IO<Error = E>> Directory<IO> {
pub async fn walk<H>(&mut self, mut walk_fn: H) -> Result<bool, Error<E>>
where
H: FnMut(&EntrySet, bool) -> bool,
{
let mut name = heapless::String::<255>::new();
let mut file_directory = FileDirectory::default();
let mut stream_extension = Secondary::<StreamExtension>::default();
let mut sector_ref = self.entry.sector_ref;
let mut name_length: u8 = 0;
let mut secondary_remain: u8 = 0;
let mut sector = self.entry.io.read(sector_ref.id()).await?;
let (mut entryset_sector_ref, mut entry_index) = (self.entry.sector_ref, 0);
loop {
let f = |block| unsafe { transmute::<&[u8; 512], &[RawEntry; 16]>(block) }.iter();
for (index, entry) in sector.iter().map(f).flatten().enumerate() {
let entry_type = RawEntryType::new(entry[0]);
if entry_type.is_end_of_directory() {
return Ok(true);
}
match entry_type.entry_type() {
Ok(EntryType::FileDirectory) => {
file_directory = unsafe { mem::transmute(*entry) };
(entryset_sector_ref, entry_index) = (sector_ref, index);
secondary_remain = file_directory.secondary_count;
}
Ok(EntryType::StreamExtension) => {
stream_extension = unsafe { mem::transmute(*entry) };
secondary_remain -= 1;
name_length = stream_extension.custom_defined.name_length;
}
Ok(EntryType::Filename) => {
let entry: &Filename = unsafe { mem::transmute(entry) };
for ch in entry.filename {
let ch = unsafe { char::from_u32_unchecked(ch.to_ne() as u32) };
name.push(ch).ok();
}
secondary_remain -= 1;
}
_ => continue,
}
if secondary_remain > 0 {
continue;
}
name.truncate(name_length as usize);
let entry_set = EntrySet {
name: name.clone(),
file_directory,
stream_extension: stream_extension.clone(),
sector_ref: entryset_sector_ref,
entry_index,
};
if walk_fn(&entry_set, entry_type.in_use()) {
return Ok(false);
}
name.truncate(0);
}
sector_ref = self.entry.next(sector_ref).await?;
sector = self.entry.io.read(sector_ref.id()).await?;
}
}
pub async fn find<H>(&mut self, find_fn: H) -> Result<Option<EntrySet>, Error<E>>
where
H: Fn(&EntrySet, bool) -> bool,
{
let mut found: Option<EntrySet> = None;
self.walk(|entry_set, in_use| -> bool {
if find_fn(entry_set, in_use) {
found = Some(entry_set.clone());
return true;
}
false
})
.await?;
Ok(found)
}
pub async fn touch(&mut self, datetime: DateTime, option: TouchOption) -> Result<(), Error<E>> {
self.entry.touch(datetime, option).await?;
self.entry.io.flush().await
}
pub async fn open(&mut self, name: &str) -> Result<FileOrDirectory<IO>, Error<E>> {
let upcase_table = self.upcase_table.clone();
let future = self.find(|entry_set, in_use| -> bool {
in_use && upcase_table.equals(name, entry_set.name.as_str())
});
let entry_set = future.await?.ok_or(Error::NoSuchFileOrDirectory)?;
let stream_extension = &entry_set.stream_extension;
let cluster_id = stream_extension.first_cluster.to_ne();
let sector_ref = self.entry.sector_ref.new(cluster_id.into(), 0);
if !with_context!(self.entry.context).add_entry(sector_ref.cluster_id) {
return Err(Error::AlreadyOpen);
}
let entry = ClusterEntry {
io: self.entry.io.clone(),
context: self.entry.context.clone(),
fat_info: self.entry.fat_info,
meta: entry_set.sector_ref,
entry_index: entry_set.entry_index,
sector_ref,
sector_size_shift: self.entry.sector_size_shift,
last_cluster_id: 0.into(),
length: stream_extension.custom_defined.valid_data_length.to_ne(),
capacity: stream_extension.data_length.to_ne(),
closed: false,
};
if entry_set.file_directory.file_attributes().directory() > 0 {
Ok(FileOrDirectory::Directory(Directory {
entry,
upcase_table: self.upcase_table.clone(),
}))
} else {
Ok(FileOrDirectory::File(File {
entry,
sector_ref,
offset: 0,
}))
}
}
pub async fn close(self) -> Result<(), Error<E>> {
self.entry.close().await
}
}