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use crate::{
datetime::{self, DateTime},
ord::OrdIsValueOrd,
DecodeValue, EncodeValue, Error, ErrorKind, FixedTag, Header, Length, Reader, Result, Tag,
Writer,
};
use core::time::Duration;
#[cfg(feature = "std")]
use std::time::SystemTime;
pub const MAX_YEAR: u16 = 2049;
#[derive(Copy, Clone, Debug, Eq, PartialEq, PartialOrd, Ord)]
pub struct UtcTime(DateTime);
impl UtcTime {
pub const LENGTH: usize = 13;
pub fn from_date_time(datetime: DateTime) -> Result<Self> {
if datetime.year() <= MAX_YEAR {
Ok(Self(datetime))
} else {
Err(Self::TAG.value_error())
}
}
pub fn to_date_time(&self) -> DateTime {
self.0
}
pub fn from_unix_duration(unix_duration: Duration) -> Result<Self> {
DateTime::from_unix_duration(unix_duration)?.try_into()
}
pub fn to_unix_duration(&self) -> Duration {
self.0.unix_duration()
}
#[cfg(feature = "std")]
pub fn from_system_time(time: SystemTime) -> Result<Self> {
DateTime::try_from(time)
.map_err(|_| Self::TAG.value_error())?
.try_into()
}
#[cfg(feature = "std")]
pub fn to_system_time(&self) -> SystemTime {
self.0.to_system_time()
}
}
impl_any_conversions!(UtcTime);
impl<'a> DecodeValue<'a> for UtcTime {
fn decode_value<R: Reader<'a>>(reader: &mut R, header: Header) -> Result<Self> {
if Self::LENGTH != usize::try_from(header.length)? {
return Err(Self::TAG.value_error());
}
let mut bytes = [0u8; Self::LENGTH];
reader.read_into(&mut bytes)?;
match bytes {
[year1, year2, mon1, mon2, day1, day2, hour1, hour2, min1, min2, sec1, sec2, b'Z'] => {
let year = u16::from(datetime::decode_decimal(Self::TAG, year1, year2)?);
let month = datetime::decode_decimal(Self::TAG, mon1, mon2)?;
let day = datetime::decode_decimal(Self::TAG, day1, day2)?;
let hour = datetime::decode_decimal(Self::TAG, hour1, hour2)?;
let minute = datetime::decode_decimal(Self::TAG, min1, min2)?;
let second = datetime::decode_decimal(Self::TAG, sec1, sec2)?;
let year = if year >= 50 {
year.checked_add(1900)
} else {
year.checked_add(2000)
}
.ok_or(ErrorKind::DateTime)?;
DateTime::new(year, month, day, hour, minute, second)
.map_err(|_| Self::TAG.value_error())
.and_then(|dt| Self::from_unix_duration(dt.unix_duration()))
}
_ => Err(Self::TAG.value_error()),
}
}
}
impl EncodeValue for UtcTime {
fn value_len(&self) -> Result<Length> {
Self::LENGTH.try_into()
}
fn encode_value(&self, writer: &mut impl Writer) -> Result<()> {
let year = match self.0.year() {
y @ 1950..=1999 => y.checked_sub(1900),
y @ 2000..=2049 => y.checked_sub(2000),
_ => return Err(Self::TAG.value_error()),
}
.and_then(|y| u8::try_from(y).ok())
.ok_or(ErrorKind::DateTime)?;
datetime::encode_decimal(writer, Self::TAG, year)?;
datetime::encode_decimal(writer, Self::TAG, self.0.month())?;
datetime::encode_decimal(writer, Self::TAG, self.0.day())?;
datetime::encode_decimal(writer, Self::TAG, self.0.hour())?;
datetime::encode_decimal(writer, Self::TAG, self.0.minutes())?;
datetime::encode_decimal(writer, Self::TAG, self.0.seconds())?;
writer.write_byte(b'Z')
}
}
impl FixedTag for UtcTime {
const TAG: Tag = Tag::UtcTime;
}
impl OrdIsValueOrd for UtcTime {}
impl From<&UtcTime> for UtcTime {
fn from(value: &UtcTime) -> UtcTime {
*value
}
}
impl From<UtcTime> for DateTime {
fn from(utc_time: UtcTime) -> DateTime {
utc_time.0
}
}
impl From<&UtcTime> for DateTime {
fn from(utc_time: &UtcTime) -> DateTime {
utc_time.0
}
}
impl TryFrom<DateTime> for UtcTime {
type Error = Error;
fn try_from(datetime: DateTime) -> Result<Self> {
Self::from_date_time(datetime)
}
}
impl TryFrom<&DateTime> for UtcTime {
type Error = Error;
fn try_from(datetime: &DateTime) -> Result<Self> {
Self::from_date_time(*datetime)
}
}
#[cfg(feature = "std")]
impl From<UtcTime> for SystemTime {
fn from(utc_time: UtcTime) -> SystemTime {
utc_time.to_system_time()
}
}
#[cfg(feature = "arbitrary")]
impl<'a> arbitrary::Arbitrary<'a> for UtcTime {
fn arbitrary(u: &mut arbitrary::Unstructured<'a>) -> arbitrary::Result<Self> {
const MIN_YEAR: u16 = 1970;
const VALID_YEAR_COUNT: u16 = MAX_YEAR - MIN_YEAR + 1;
const AVERAGE_SECONDS_IN_YEAR: u64 = 31_556_952;
let datetime = DateTime::arbitrary(u)?;
let year = datetime.year();
let duration = datetime.unix_duration();
let valid_year = (year.saturating_sub(MIN_YEAR))
.rem_euclid(VALID_YEAR_COUNT)
.saturating_add(MIN_YEAR);
let year_to_remove = year.saturating_sub(valid_year);
let valid_duration = duration
- Duration::from_secs(
u64::from(year_to_remove).saturating_mul(AVERAGE_SECONDS_IN_YEAR),
);
Self::from_date_time(DateTime::from_unix_duration(valid_duration).expect("supported range"))
.map_err(|_| arbitrary::Error::IncorrectFormat)
}
fn size_hint(depth: usize) -> (usize, Option<usize>) {
DateTime::size_hint(depth)
}
}
#[cfg(test)]
mod tests {
use super::UtcTime;
use crate::{Decode, Encode, SliceWriter};
use hex_literal::hex;
#[test]
fn round_trip_vector() {
let example_bytes = hex!("17 0d 39 31 30 35 30 36 32 33 34 35 34 30 5a");
let utc_time = UtcTime::from_der(&example_bytes).unwrap();
assert_eq!(utc_time.to_unix_duration().as_secs(), 673573540);
let mut buf = [0u8; 128];
let mut encoder = SliceWriter::new(&mut buf);
utc_time.encode(&mut encoder).unwrap();
assert_eq!(example_bytes, encoder.finish().unwrap());
}
}