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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, out: &mut dyn std::io::Write) -> std::io::Result<()> {
let mut itoa = itoa::Buffer::new();
out.write_all(itoa.format(self.seconds).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: u32 = 60 * 60;
let offset = self.offset.unsigned_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 write it using [`Time::write_to()`].
pub fn size(&self) -> usize {
(if self.seconds >= 1_000_000_000_000_000_000 {
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} else if self.seconds >= 100_000_000_000_000_000 {
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} else if self.seconds >= 10_000_000_000_000_000 {
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} else if self.seconds >= 1_000_000_000_000_000 {
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} else if self.seconds >= 100_000_000_000_000 {
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} else if self.seconds >= 10_000_000_000_000 {
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} else if self.seconds >= 1_000_000_000_000 {
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} else if self.seconds >= 100_000_000_000 {
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} else if self.seconds >= 10_000_000_000 {
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} else if self.seconds >= 1_000_000_000 {
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} else if self.seconds >= 100_000_000 {
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} else if self.seconds >= 10_000_000 {
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} else if self.seconds >= 1_000_000 {
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} else if self.seconds >= 100_000 {
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} else if self.seconds >= 10_000 {
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} else if self.seconds >= 1_000 {
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} else if self.seconds >= 100 {
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} else if self.seconds >= 10 {
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} else if self.seconds >= 0 {
1
// from here, it's sign + num-digits characters
} else if self.seconds >= -10 {
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} else if self.seconds >= -100 {
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} else if self.seconds >= -1_000 {
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} else if self.seconds >= -10_000 {
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} else if self.seconds >= -100_000 {
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} else if self.seconds >= -1_000_000 {
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} else if self.seconds >= -10_000_000 {
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} else if self.seconds >= -100_000_000 {
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} else if self.seconds >= -1_000_000_000 {
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} else if self.seconds >= -10_000_000_000 {
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} else if self.seconds >= -100_000_000_000 {
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} else if self.seconds >= -1_000_000_000_000 {
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} else if self.seconds >= -10_000_000_000_000 {
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} else if self.seconds >= -100_000_000_000_000 {
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} else if self.seconds >= -1_000_000_000_000_000 {
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} else if self.seconds >= -10_000_000_000_000_000 {
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} else if self.seconds >= -100_000_000_000_000_000 {
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} else if self.seconds >= -1_000_000_000_000_000_000 {
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} else {
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}) + 2 /*space + offset sign*/ + 2 /*offset hours*/ + 2 /*offset minutes*/
}
}
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