use bstr::BString;use crate::{time::Sign, Time};/// Serialization with standard `git` formatimpl Time { /// Serialize this instance into memory, similar to what [`write_to()`][Self::write_to()] would do with arbitrary `Write` implementations. pub fn to_bstring(&self) -> BString { let mut buf = Vec::with_capacity(64); self.write_to(&mut buf).expect("write to memory cannot fail"); buf.into() } /// 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 std::io::Write) -> std::io::Result<()> { let mut itoa = itoa::Buffer::new(); out.write_all(itoa.format(self.seconds_since_unix_epoch).as_bytes())?; out.write_all(b" ")?; 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 bstr::BString;
use crate::{time::Sign, Time};
/// Serialization with standard `git` format
impl Time {
/// Serialize this instance into memory, similar to what [`write_to()`][Self::write_to()] would do with arbitrary `Write` implementations.
pub fn to_bstring(&self) -> BString {
let mut buf = Vec::with_capacity(64);
self.write_to(&mut buf).expect("write to memory cannot fail");
buf.into()
}
/// 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 std::io::Write) -> std::io::Result<()> {
let mut itoa = itoa::Buffer::new();
out.write_all(itoa.format(self.seconds_since_unix_epoch).as_bytes())?;
out.write_all(b" ")?;
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*/
}
}