use std::io; use crate::{Sign, Time, SPACE}; impl From<i32> for Sign { fn from(v: i32) -> Self { if v < 0 { Sign::Minus } else { Sign::Plus } }} impl Default for Time { fn default() -> Self { Time { seconds_since_unix_epoch: 0, offset_in_seconds: 0, sign: Sign::Plus, } }} impl Time { /// Create a new instance from seconds and offset. pub fn new(seconds_since_unix_epoch: u32, offset_in_seconds: i32) -> Self { Time { seconds_since_unix_epoch, offset_in_seconds, sign: offset_in_seconds.into(), } } /// Return the passed seconds since epoch since this signature was made. pub fn seconds(&self) -> u32 { self.seconds_since_unix_epoch } /// Serialize this instance to `out` in a format suitable for use in header fields of serialized git commits or tags. pub fn write_to(&self, mut out: impl io::Write) -> io::Result<()> { let mut itoa = itoa::Buffer::new(); out.write_all(itoa.format(self.seconds_since_unix_epoch).as_bytes())?; out.write_all(SPACE)?; out.write_all(match self.sign { Sign::Plus => b"+", Sign::Minus => b"-", })?; const ZERO: &[u8; 1] = b"0"; const SECONDS_PER_HOUR: i32 = 60 * 60; let offset = self.offset_in_seconds.abs(); let hours = offset / SECONDS_PER_HOUR; assert!(hours < 25, "offset is more than a day: {}", hours); let minutes = (offset - (hours * SECONDS_PER_HOUR)) / 60; if hours < 10 { out.write_all(ZERO)?; } out.write_all(itoa.format(hours).as_bytes())?; if minutes < 10 { out.write_all(ZERO)?; } out.write_all(itoa.format(minutes).as_bytes()).map(|_| ()) } /// Computes the number of bytes necessary to render this time pub fn size(&self) -> usize { // TODO: this is not year 2038 safe…but we also can't parse larger numbers (or represent them) anyway. It's a trap nonetheless // that can be fixed by increasing the size to usize. (if self.seconds_since_unix_epoch >= 1_000_000_000 { 10 } else if self.seconds_since_unix_epoch >= 100_000_000 { 9 } else if self.seconds_since_unix_epoch >= 10_000_000 { 8 } else if self.seconds_since_unix_epoch >= 1_000_000 { 7 } else if self.seconds_since_unix_epoch >= 100_000 { 6 } else if self.seconds_since_unix_epoch >= 10_000 { 5 } else if self.seconds_since_unix_epoch >= 1_000 { 4 } else if self.seconds_since_unix_epoch >= 100 { 3 } else if self.seconds_since_unix_epoch >= 10 { 2 } else { 1 }) + 2 /*space + sign*/ + 2 /*hours*/ + 2 /*minutes*/ }}
use std::io;
use crate::{Sign, Time, SPACE};
impl From<i32> for Sign {
fn from(v: i32) -> Self {
if v < 0 {
Sign::Minus
} else {
Sign::Plus
}
}
}
impl Default for Time {
fn default() -> Self {
Time {
seconds_since_unix_epoch: 0,
offset_in_seconds: 0,
sign: Sign::Plus,
}
}
}
impl Time {
/// Create a new instance from seconds and offset.
pub fn new(seconds_since_unix_epoch: u32, offset_in_seconds: i32) -> Self {
Time {
seconds_since_unix_epoch,
offset_in_seconds,
sign: offset_in_seconds.into(),
}
}
/// Return the passed seconds since epoch since this signature was made.
pub fn seconds(&self) -> u32 {
self.seconds_since_unix_epoch
}
/// Serialize this instance to `out` in a format suitable for use in header fields of serialized git commits or tags.
pub fn write_to(&self, mut out: impl io::Write) -> io::Result<()> {
let mut itoa = itoa::Buffer::new();
out.write_all(itoa.format(self.seconds_since_unix_epoch).as_bytes())?;
out.write_all(SPACE)?;
out.write_all(match self.sign {
Sign::Plus => b"+",
Sign::Minus => b"-",
})?;
const ZERO: &[u8; 1] = b"0";
const SECONDS_PER_HOUR: i32 = 60 * 60;
let offset = self.offset_in_seconds.abs();
let hours = offset / SECONDS_PER_HOUR;
assert!(hours < 25, "offset is more than a day: {}", hours);
let minutes = (offset - (hours * SECONDS_PER_HOUR)) / 60;
if hours < 10 {
out.write_all(ZERO)?;
}
out.write_all(itoa.format(hours).as_bytes())?;
if minutes < 10 {
out.write_all(ZERO)?;
}
out.write_all(itoa.format(minutes).as_bytes()).map(|_| ())
}
/// Computes the number of bytes necessary to render this time
pub fn size(&self) -> usize {
// TODO: this is not year 2038 safe…but we also can't parse larger numbers (or represent them) anyway. It's a trap nonetheless
// that can be fixed by increasing the size to usize.
(if self.seconds_since_unix_epoch >= 1_000_000_000 {
10
} else if self.seconds_since_unix_epoch >= 100_000_000 {
9
} else if self.seconds_since_unix_epoch >= 10_000_000 {
8
} else if self.seconds_since_unix_epoch >= 1_000_000 {
7
} else if self.seconds_since_unix_epoch >= 100_000 {
6
} else if self.seconds_since_unix_epoch >= 10_000 {
5
} else if self.seconds_since_unix_epoch >= 1_000 {
4
} else if self.seconds_since_unix_epoch >= 100 {
3
} else if self.seconds_since_unix_epoch >= 10 {
2
} else {
1
}) + 2 /*space + sign*/ + 2 /*hours*/ + 2 /*minutes*/
}
}