fuchsia_fatfs/
util.rs

1// Copyright 2020 The Fuchsia Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5use chrono::offset::TimeZone;
6use chrono::Local;
7use fatfs::{DateTime, FatfsError};
8use std::io::{self, ErrorKind};
9use zx::Status;
10
11/// Returns the equivalent of the given DOS time as ns past the unix epoch.
12pub fn dos_to_unix_time(dos_time: DateTime) -> u64 {
13    let datetime = chrono::DateTime::<Local>::from(dos_time);
14    datetime.timestamp_nanos_opt().unwrap() as u64
15}
16
17/// Returns the given unix timestamp in ns as a FAT-compatible DateTime.
18pub fn unix_to_dos_time(timestamp: u64) -> DateTime {
19    DateTime::from(Local.timestamp_nanos(timestamp as i64))
20}
21
22pub fn fatfs_error_to_status(error: io::Error) -> Status {
23    match error.kind() {
24        ErrorKind::AddrInUse => Status::ADDRESS_IN_USE,
25        ErrorKind::AddrNotAvailable => Status::UNAVAILABLE,
26        ErrorKind::AlreadyExists => Status::ALREADY_EXISTS,
27        ErrorKind::BrokenPipe => Status::PEER_CLOSED,
28        ErrorKind::ConnectionAborted => Status::CONNECTION_ABORTED,
29        ErrorKind::ConnectionRefused => Status::CONNECTION_REFUSED,
30        ErrorKind::ConnectionReset => Status::CONNECTION_RESET,
31        ErrorKind::Interrupted => Status::INTERRUPTED_RETRY,
32        ErrorKind::InvalidData => Status::IO_INVALID,
33        ErrorKind::InvalidInput => Status::INVALID_ARGS,
34        ErrorKind::NotConnected => Status::NOT_CONNECTED,
35        ErrorKind::NotFound => Status::NOT_FOUND,
36        ErrorKind::PermissionDenied => Status::ACCESS_DENIED,
37        ErrorKind::TimedOut => Status::TIMED_OUT,
38        ErrorKind::UnexpectedEof => Status::BUFFER_TOO_SMALL,
39        ErrorKind::WouldBlock => Status::BAD_STATE,
40        ErrorKind::WriteZero => Status::NO_SPACE,
41        ErrorKind::Other => {
42            error
43                .into_inner()
44                .and_then(|b| b.downcast::<FatfsError>().ok())
45                .map(|b| {
46                    match *b {
47                        // errors caused in boot_sector.rs
48                        FatfsError::UnknownVersion => Status::NOT_SUPPORTED,
49                        FatfsError::InvalidBootSectorSig => Status::NOT_SUPPORTED,
50                        FatfsError::VolumeTooSmall => Status::NO_SPACE,
51                        // errors caused in dir.rs:
52                        FatfsError::IsDirectory => Status::NOT_FILE,
53                        FatfsError::NotDirectory => Status::NOT_DIR,
54                        FatfsError::DirectoryNotEmpty => Status::NOT_EMPTY,
55                        FatfsError::FileNameTooLong => Status::BAD_PATH,
56                        FatfsError::FileNameEmpty => Status::BAD_PATH,
57                        FatfsError::FileNameBadCharacter => Status::BAD_PATH,
58                        // errors caused in fs.rs
59                        FatfsError::TooManySectors => Status::OUT_OF_RANGE,
60                        // errors caused in table.rs
61                        FatfsError::NoSpace => Status::NO_SPACE,
62                        // Other errors (which come from boot_sector.rs and fs.rs) indicate
63                        // that the filesystem is corrupted or invalid in some way.
64                        // We don't enumerate them here, because there's a lot of them.
65                        _ => Status::INVALID_ARGS,
66                    }
67                })
68                .unwrap_or(Status::IO)
69        }
70        _ => Status::IO,
71    }
72}
73
74#[cfg(test)]
75mod tests {
76    use super::*;
77    use fatfs::{Date, Time};
78
79    fn dos_datetime(
80        year: u16,
81        month: u16,
82        day: u16,
83        hour: u16,
84        min: u16,
85        sec: u16,
86        millis: u16,
87    ) -> DateTime {
88        DateTime { date: Date { year, month, day }, time: Time { hour, min, sec, millis } }
89    }
90
91    const NS_PER_MS: u64 = 1_000_000;
92
93    fn ms_to_ns(ts: u64) -> u64 {
94        ts * NS_PER_MS
95    }
96
97    #[fuchsia::test]
98    fn test_dos_to_unix_time() {
99        let earliest_time = dos_datetime(1980, 1, 1, 0, 0, 0, 0);
100        assert_eq!(dos_to_unix_time(earliest_time), ms_to_ns(315532800000));
101
102        let latest_time = dos_datetime(2107, 12, 31, 23, 59, 59, 999);
103        assert_eq!(dos_to_unix_time(latest_time), ms_to_ns(4354819199999));
104
105        let time = dos_datetime(2038, 1, 19, 3, 14, 7, 0);
106        assert_eq!(dos_to_unix_time(time), ms_to_ns(2147483647000));
107    }
108
109    #[fuchsia::test]
110    fn test_unix_to_dos_time() {
111        let earliest_time = dos_datetime(1980, 1, 1, 0, 0, 0, 0);
112        assert_eq!(earliest_time, unix_to_dos_time(ms_to_ns(315532800000)));
113
114        let latest_time = dos_datetime(2107, 12, 31, 23, 59, 59, 999);
115        assert_eq!(latest_time, unix_to_dos_time(ms_to_ns(4354819199999)));
116
117        let time = dos_datetime(2038, 1, 19, 3, 14, 7, 0);
118        assert_eq!(time, unix_to_dos_time(ms_to_ns(2147483647000)));
119    }
120}
fuchsia_fatfs/util.rs

fuchsia_fatfs/
util.rs
