Robin Mueller
79791a75bd
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1120 lines
42 KiB
Rust
1120 lines
42 KiB
Rust
//! Module to generate or read CCSDS Unsegmented (CUC) timestamps as specified in
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//! [CCSDS 301.0-B-4](https://public.ccsds.org/Pubs/301x0b4e1.pdf) section 3.2 .
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//!
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//! The core data structure to do this is the [TimeProviderCcsdsEpoch] struct.
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use super::*;
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use chrono::Datelike;
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use core::fmt::Debug;
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use core::ops::{Add, AddAssign};
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use core::time::Duration;
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const MIN_CUC_LEN: usize = 2;
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/// Base value for the preamble field for a time field parser to determine the time field type.
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pub const P_FIELD_BASE: u8 = (CcsdsTimeCodes::CucCcsdsEpoch as u8) << 4;
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/// Maximum length if the preamble field is not extended.
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pub const MAX_CUC_LEN_SMALL_PREAMBLE: usize = 8;
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#[derive(Copy, Clone, PartialEq, Eq, Debug)]
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#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
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pub enum FractionalResolution {
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/// No fractional part, only second resolution
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Seconds = 0,
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/// 256 fractional parts, resulting in 1/255 ~= 4 ms fractional resolution
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FourMs = 1,
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/// 65535 fractional parts, resulting in 1/65535 ~= 15 us fractional resolution
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FifteenUs = 2,
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/// 16777215 fractional parts, resulting in 1/16777215 ~= 60 ns fractional resolution
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SixtyNs = 3,
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}
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impl TryFrom<u8> for FractionalResolution {
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type Error = ();
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fn try_from(v: u8) -> Result<Self, Self::Error> {
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match v {
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0 => Ok(FractionalResolution::Seconds),
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1 => Ok(FractionalResolution::FourMs),
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2 => Ok(FractionalResolution::FifteenUs),
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3 => Ok(FractionalResolution::SixtyNs),
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_ => Err(()),
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}
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}
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}
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/// Please note that this function will panic if the fractional value is not smaller than
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/// the maximum number of fractions allowed for the particular resolution.
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/// (e.g. passing 270 when the resolution only allows 255 values).
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#[inline]
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pub fn convert_fractional_part_to_ns(fractional_part: FractionalPart) -> u64 {
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let div = fractional_res_to_div(fractional_part.0);
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assert!(fractional_part.1 < div);
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10_u64.pow(9) * fractional_part.1 as u64 / div as u64
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}
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#[inline(always)]
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pub const fn fractional_res_to_div(res: FractionalResolution) -> u32 {
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2_u32.pow(8 * res as u32) - 1
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}
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/// Calculate the fractional part for a given resolution and subsecond nanoseconds.
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/// Please note that this function will panic if the passed nanoseconds exceeds 1 second
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/// as a nanosecond (10 to the power of 9). Furthermore, it will return [None] if the
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/// given resolution is [FractionalResolution::Seconds].
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pub fn fractional_part_from_subsec_ns(
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res: FractionalResolution,
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ns: u64,
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) -> Option<FractionalPart> {
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if res == FractionalResolution::Seconds {
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return None;
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}
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let sec_as_ns = 10_u64.pow(9);
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if ns > sec_as_ns {
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panic!("passed nanosecond value larger than 1 second");
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}
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let resolution = fractional_res_to_div(res) as u64;
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// Use integer division because this can reduce code size of really small systems.
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// First determine the nanoseconds for the smallest segment given the resolution.
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// Then divide by that to find out the fractional part. For the calculation of the smallest
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// fraction, we perform a ceiling division. This is because if we would use the default
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// flooring division, we would divide by a smaller value, thereby allowing the calculation to
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// invalid fractional parts which are too large. For the division of the nanoseconds by the
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// smallest fraction, a flooring division is correct.
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// The multiplication with 100000 is necessary to avoid precision loss during integer division.
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// TODO: Floating point division might actually be faster option, but requires additional
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// code on small embedded systems..
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let fractional_part = ns * 100000 / ((sec_as_ns * 100000 + resolution) / resolution);
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// Floating point division.
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//let fractional_part = (ns as f64 / ((sec_as_ns as f64) / resolution as f64)).floor() as u32;
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Some(FractionalPart(res, fractional_part as u32))
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}
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#[derive(Copy, Clone, PartialEq, Eq, Debug)]
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#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
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pub enum CucError {
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InvalidCounterWidth(u8),
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InvalidFractionResolution(FractionalResolution),
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/// Invalid counter supplied.
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InvalidCounter(u8, u64),
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InvalidFractions(FractionalResolution, u64),
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}
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impl Display for CucError {
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fn fmt(&self, f: &mut Formatter<'_>) -> core::fmt::Result {
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match self {
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CucError::InvalidCounterWidth(w) => {
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write!(f, "invalid cuc counter byte width {w}")
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}
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CucError::InvalidFractionResolution(w) => {
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write!(f, "invalid cuc fractional part byte width {w:?}")
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}
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CucError::InvalidCounter(w, c) => {
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write!(f, "invalid cuc counter {c} for width {w}")
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}
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CucError::InvalidFractions(w, c) => {
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write!(f, "invalid cuc fractional part {c} for width {w:?}")
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}
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}
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}
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}
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#[cfg(feature = "std")]
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impl Error for CucError {}
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#[derive(Copy, Clone, PartialEq, Eq, Debug)]
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#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
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pub struct WidthCounterPair(u8, u32);
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#[derive(Copy, Clone, PartialEq, Eq, Debug)]
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#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
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pub struct FractionalPart(FractionalResolution, u32);
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/// This object is the abstraction for the CCSDS Unsegmented Time Code (CUC) using the CCSDS epoch
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/// and a small preamble field.
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///
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/// It has the capability to generate and read timestamps as specified in the CCSDS 301.0-B-4
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/// section 3.2 . The preamble field only has one byte, which allows a time code representation
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/// through the year 2094. The time is represented as a simple binary counter starting from the
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/// fixed CCSDS epoch (1958-01-01T00:00:00+00:00). It is possible to provide subsecond accuracy
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/// using the fractional field with various available [resolutions][FractionalResolution].
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///
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/// Having a preamble field of one byte limits the width of the counter
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/// type (generally seconds) to 4 bytes and the width of the fractions type to 3 bytes. This limits
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/// the maximum time stamp size to [MAX_CUC_LEN_SMALL_PREAMBLE] (8 bytes).
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///
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/// # Example
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///
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/// ```
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/// use spacepackets::time::cuc::{FractionalResolution, TimeProviderCcsdsEpoch};
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/// use spacepackets::time::{TimeWriter, CcsdsTimeCodes, TimeReader, CcsdsTimeProvider};
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///
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/// // Highest fractional resolution
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/// let timestamp_now = TimeProviderCcsdsEpoch::from_now(FractionalResolution::SixtyNs).expect("creating cuc stamp failed");
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/// let mut raw_stamp = [0; 16];
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/// {
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/// let written = timestamp_now.write_to_bytes(&mut raw_stamp).expect("writing timestamp failed");
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/// assert_eq!((raw_stamp[0] >> 4) & 0b111, CcsdsTimeCodes::CucCcsdsEpoch as u8);
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/// // 1 byte preamble + 4 byte counter + 3 byte fractional part
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/// assert_eq!(written, 8);
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/// }
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/// {
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/// let read_result = TimeProviderCcsdsEpoch::from_bytes(&raw_stamp);
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/// assert!(read_result.is_ok());
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/// let stamp_deserialized = read_result.unwrap();
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/// assert_eq!(stamp_deserialized, timestamp_now);
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/// }
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/// ```
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#[derive(Copy, Clone, PartialEq, Eq, Debug)]
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#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
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pub struct TimeProviderCcsdsEpoch {
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pfield: u8,
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counter: WidthCounterPair,
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fractions: Option<FractionalPart>,
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}
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#[inline]
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pub fn pfield_len(pfield: u8) -> usize {
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if ((pfield >> 7) & 0b1) == 1 {
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return 2;
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}
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1
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}
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impl TimeProviderCcsdsEpoch {
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/// Create a time provider with a four byte counter and no fractional part.
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pub fn new(counter: u32) -> Self {
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// These values are definitely valid, so it is okay to unwrap here.
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Self::new_generic(WidthCounterPair(4, counter), None).unwrap()
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}
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/// Like [TimeProviderCcsdsEpoch::new] but allow to supply a fractional part as well.
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pub fn new_with_fractions(counter: u32, fractions: FractionalPart) -> Result<Self, CucError> {
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Self::new_generic(WidthCounterPair(4, counter), Some(fractions))
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}
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/// Fractions with a resolution of ~ 4 ms
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pub fn new_with_coarse_fractions(counter: u32, subsec_fractions: u8) -> Self {
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// These values are definitely valid, so it is okay to unwrap here.
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Self::new_generic(
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WidthCounterPair(4, counter),
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Some(FractionalPart(
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FractionalResolution::FourMs,
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subsec_fractions as u32,
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)),
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)
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.unwrap()
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}
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/// Fractions with a resolution of ~ 16 us
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pub fn new_with_medium_fractions(counter: u32, subsec_fractions: u16) -> Self {
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// These values are definitely valid, so it is okay to unwrap here.
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Self::new_generic(
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WidthCounterPair(4, counter),
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Some(FractionalPart(
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FractionalResolution::FifteenUs,
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subsec_fractions as u32,
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)),
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)
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.unwrap()
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}
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/// Fractions with a resolution of ~ 60 ns. The fractional part value is limited by the
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/// 24 bits of the fractional field, so this function will fail with
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/// [CucError::InvalidFractions] if the fractional value exceeds the value.
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pub fn new_with_fine_fractions(counter: u32, subsec_fractions: u32) -> Result<Self, CucError> {
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Self::new_generic(
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WidthCounterPair(4, counter),
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Some(FractionalPart(
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FractionalResolution::SixtyNs,
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subsec_fractions,
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)),
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)
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}
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/// This function will return the current time as a CUC timestamp.
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/// The counter width will always be set to 4 bytes because the normal CCSDS epoch will overflow
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/// when using less than that.
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#[cfg(feature = "std")]
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#[cfg_attr(doc_cfg, doc(cfg(feature = "std")))]
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pub fn from_now(fraction_resolution: FractionalResolution) -> Result<Self, StdTimestampError> {
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let now = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH)?;
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let ccsds_epoch = unix_epoch_to_ccsds_epoch(now.as_secs() as i64);
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if fraction_resolution == FractionalResolution::Seconds {
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return Ok(Self::new(ccsds_epoch as u32));
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}
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let fractions =
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fractional_part_from_subsec_ns(fraction_resolution, now.subsec_nanos() as u64);
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Self::new_with_fractions(ccsds_epoch as u32, fractions.unwrap())
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.map_err(|e| StdTimestampError::Timestamp(e.into()))
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}
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/// Updates the current time stamp from the current time. The fractional field width remains
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/// the same and will be updated accordingly.
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#[cfg(feature = "std")]
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#[cfg_attr(doc_cfg, doc(cfg(feature = "std")))]
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pub fn update_from_now(&mut self) -> Result<(), StdTimestampError> {
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let now = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH)?;
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self.counter.1 = unix_epoch_to_ccsds_epoch(now.as_secs() as i64) as u32;
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if self.fractions.is_some() {
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self.fractions = fractional_part_from_subsec_ns(
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self.fractions.unwrap().0,
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now.subsec_nanos() as u64,
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);
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}
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Ok(())
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}
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pub fn from_date_time(
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dt: &DateTime<Utc>,
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res: FractionalResolution,
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) -> Result<Self, TimestampError> {
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// Year before CCSDS epoch is invalid.
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if dt.year() < 1958 {
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return Err(TimestampError::DateBeforeCcsdsEpoch(*dt));
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}
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Self::new_generic(
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WidthCounterPair(4, dt.timestamp() as u32),
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fractional_part_from_subsec_ns(res, dt.timestamp_subsec_nanos() as u64),
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)
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.map_err(|e| e.into())
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}
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pub fn from_unix_stamp(
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unix_stamp: &UnixTimestamp,
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res: FractionalResolution,
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) -> Result<Self, TimestampError> {
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let ccsds_epoch = unix_epoch_to_ccsds_epoch(unix_stamp.unix_seconds);
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// Negative CCSDS epoch is invalid.
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if ccsds_epoch < 0 {
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return Err(TimestampError::DateBeforeCcsdsEpoch(
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unix_stamp.as_date_time().unwrap(),
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));
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}
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if ccsds_epoch > u32::MAX as i64 {
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return Err(CucError::InvalidCounter(4, ccsds_epoch as u64).into());
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}
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let mut fractions = None;
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if let Some(subsec_millis) = unix_stamp.subsecond_millis {
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fractions = fractional_part_from_subsec_ns(res, subsec_millis as u64 * 10_u64.pow(6));
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}
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Self::new_generic(WidthCounterPair(4, ccsds_epoch as u32), fractions).map_err(|e| e.into())
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}
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pub fn new_u16_counter(counter: u16) -> Self {
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// These values are definitely valid, so it is okay to unwrap here.
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Self::new_generic(WidthCounterPair(2, counter as u32), None).unwrap()
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}
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pub fn width_counter_pair(&self) -> WidthCounterPair {
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self.counter
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}
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pub fn width_fractions_pair(&self) -> Option<FractionalPart> {
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self.fractions
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}
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pub fn set_fractions(&mut self, fractions: FractionalPart) -> Result<(), CucError> {
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Self::verify_fractions_width(fractions.0)?;
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Self::verify_fractions_value(fractions)?;
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self.fractions = Some(fractions);
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self.update_p_field_fractions();
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Ok(())
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}
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/// Set a fractional resolution. Please note that this function will reset the fractional value
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/// to 0 if the resolution changes.
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pub fn set_fractional_resolution(&mut self, res: FractionalResolution) {
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if res == FractionalResolution::Seconds {
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self.fractions = None;
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}
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let mut update_fractions = true;
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if let Some(existing_fractions) = self.fractions {
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if existing_fractions.0 == res {
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update_fractions = false;
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}
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};
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if update_fractions {
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self.fractions = Some(FractionalPart(res, 0));
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}
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}
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pub fn new_generic(
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counter: WidthCounterPair,
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fractions: Option<FractionalPart>,
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) -> Result<Self, CucError> {
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Self::verify_counter_width(counter.0)?;
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if counter.1 > (2u64.pow(counter.0 as u32 * 8) - 1) as u32 {
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return Err(CucError::InvalidCounter(counter.0, counter.1 as u64));
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}
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if let Some(fractions) = fractions {
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Self::verify_fractions_width(fractions.0)?;
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Self::verify_fractions_value(fractions)?;
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}
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Ok(Self {
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pfield: Self::build_p_field(counter.0, fractions.map(|v| v.0)),
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counter,
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fractions,
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})
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}
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fn build_p_field(counter_width: u8, fractions_width: Option<FractionalResolution>) -> u8 {
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let mut pfield = P_FIELD_BASE;
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if !(1..=4).contains(&counter_width) {
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// Okay to panic here, this function is private and all input values should
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// have been sanitized
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panic!("invalid counter width {} for cuc timestamp", counter_width);
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}
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pfield |= (counter_width - 1) << 2;
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if let Some(fractions_width) = fractions_width {
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if !(1..=3).contains(&(fractions_width as u8)) {
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// Okay to panic here, this function is private and all input values should
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// have been sanitized
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panic!(
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"invalid fractions width {:?} for cuc timestamp",
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fractions_width
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);
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}
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pfield |= fractions_width as u8;
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}
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pfield
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}
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fn update_p_field_fractions(&mut self) {
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self.pfield &= !(0b11);
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if let Some(fractions) = self.fractions {
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self.pfield |= fractions.0 as u8;
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}
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}
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#[inline]
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pub fn len_cntr_from_pfield(pfield: u8) -> u8 {
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((pfield >> 2) & 0b11) + 1
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}
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#[inline]
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pub fn len_fractions_from_pfield(pfield: u8) -> u8 {
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pfield & 0b11
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}
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#[inline]
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fn unix_seconds(&self) -> i64 {
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ccsds_epoch_to_unix_epoch(self.counter.1 as i64)
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}
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/// This returns the length of the individual components of the CUC timestamp in addition
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/// to the total size.
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///
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/// This function will return a tuple where the first value is the byte width of the
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/// counter, the second value is the byte width of the fractional part, and the third
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/// components is the total size.
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pub fn len_components_and_total_from_pfield(pfield: u8) -> (u8, u8, usize) {
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let base_len: usize = 1;
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let cntr_len = Self::len_cntr_from_pfield(pfield);
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let fractions_len = Self::len_fractions_from_pfield(pfield);
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(
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cntr_len,
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fractions_len,
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base_len + cntr_len as usize + fractions_len as usize,
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)
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}
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pub fn len_packed_from_pfield(pfield: u8) -> usize {
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let mut base_len: usize = 1;
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base_len += Self::len_cntr_from_pfield(pfield) as usize;
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base_len += Self::len_fractions_from_pfield(pfield) as usize;
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base_len
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}
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/// Verifies the raw width parameter.
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fn verify_counter_width(width: u8) -> Result<(), CucError> {
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if width == 0 || width > 4 {
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return Err(CucError::InvalidCounterWidth(width));
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}
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Ok(())
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}
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fn verify_fractions_width(width: FractionalResolution) -> Result<(), CucError> {
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if width as u8 > 3 {
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return Err(CucError::InvalidFractionResolution(width));
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}
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Ok(())
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}
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fn verify_fractions_value(val: FractionalPart) -> Result<(), CucError> {
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if val.1 > 2u32.pow((val.0 as u32) * 8) - 1 {
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return Err(CucError::InvalidFractions(val.0, val.1 as u64));
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}
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Ok(())
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}
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}
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|
|
impl TimeReader for TimeProviderCcsdsEpoch {
|
|
fn from_bytes(buf: &[u8]) -> Result<Self, TimestampError>
|
|
where
|
|
Self: Sized,
|
|
{
|
|
if buf.len() < MIN_CUC_LEN {
|
|
return Err(TimestampError::ByteConversion(
|
|
ByteConversionError::FromSliceTooSmall(SizeMissmatch {
|
|
expected: MIN_CUC_LEN,
|
|
found: buf.len(),
|
|
}),
|
|
));
|
|
}
|
|
match ccsds_time_code_from_p_field(buf[0]) {
|
|
Ok(code) => {
|
|
if code != CcsdsTimeCodes::CucCcsdsEpoch {
|
|
return Err(TimestampError::InvalidTimeCode(
|
|
CcsdsTimeCodes::CucCcsdsEpoch,
|
|
code as u8,
|
|
));
|
|
}
|
|
}
|
|
Err(raw) => {
|
|
return Err(TimestampError::InvalidTimeCode(
|
|
CcsdsTimeCodes::CucCcsdsEpoch,
|
|
raw,
|
|
))
|
|
}
|
|
}
|
|
let (cntr_len, fractions_len, total_len) =
|
|
Self::len_components_and_total_from_pfield(buf[0]);
|
|
if buf.len() < total_len {
|
|
return Err(TimestampError::ByteConversion(
|
|
ByteConversionError::FromSliceTooSmall(SizeMissmatch {
|
|
expected: total_len,
|
|
found: buf.len(),
|
|
}),
|
|
));
|
|
}
|
|
let mut current_idx = 1;
|
|
let counter = match cntr_len {
|
|
1 => buf[current_idx] as u32,
|
|
2 => u16::from_be_bytes(buf[current_idx..current_idx + 2].try_into().unwrap()) as u32,
|
|
3 => {
|
|
let mut tmp_buf: [u8; 4] = [0; 4];
|
|
tmp_buf[1..4].copy_from_slice(&buf[current_idx..current_idx + 3]);
|
|
u32::from_be_bytes(tmp_buf)
|
|
}
|
|
4 => u32::from_be_bytes(buf[current_idx..current_idx + 4].try_into().unwrap()),
|
|
_ => panic!("unreachable match arm"),
|
|
};
|
|
current_idx += cntr_len as usize;
|
|
let mut fractions = None;
|
|
if fractions_len > 0 {
|
|
match fractions_len {
|
|
1 => {
|
|
fractions = Some(FractionalPart(
|
|
fractions_len.try_into().unwrap(),
|
|
buf[current_idx] as u32,
|
|
))
|
|
}
|
|
2 => {
|
|
fractions = Some(FractionalPart(
|
|
fractions_len.try_into().unwrap(),
|
|
u16::from_be_bytes(buf[current_idx..current_idx + 2].try_into().unwrap())
|
|
as u32,
|
|
))
|
|
}
|
|
3 => {
|
|
let mut tmp_buf: [u8; 4] = [0; 4];
|
|
tmp_buf[1..4].copy_from_slice(&buf[current_idx..current_idx + 3]);
|
|
fractions = Some(FractionalPart(
|
|
fractions_len.try_into().unwrap(),
|
|
u32::from_be_bytes(tmp_buf),
|
|
))
|
|
}
|
|
_ => panic!("unreachable match arm"),
|
|
}
|
|
}
|
|
let provider = Self::new_generic(WidthCounterPair(cntr_len, counter), fractions)?;
|
|
Ok(provider)
|
|
}
|
|
}
|
|
|
|
impl TimeWriter for TimeProviderCcsdsEpoch {
|
|
fn write_to_bytes(&self, bytes: &mut [u8]) -> Result<usize, TimestampError> {
|
|
// Cross check the sizes of the counters against byte widths in the ctor
|
|
if bytes.len() < self.len_as_bytes() {
|
|
return Err(TimestampError::ByteConversion(
|
|
ByteConversionError::ToSliceTooSmall(SizeMissmatch {
|
|
found: bytes.len(),
|
|
expected: self.len_as_bytes(),
|
|
}),
|
|
));
|
|
}
|
|
bytes[0] = self.pfield;
|
|
let mut current_idx: usize = 1;
|
|
match self.counter.0 {
|
|
1 => {
|
|
bytes[current_idx] = self.counter.1 as u8;
|
|
}
|
|
2 => {
|
|
bytes[current_idx..current_idx + 2]
|
|
.copy_from_slice(&(self.counter.1 as u16).to_be_bytes());
|
|
}
|
|
3 => {
|
|
bytes[current_idx..current_idx + 3]
|
|
.copy_from_slice(&self.counter.1.to_be_bytes()[1..4]);
|
|
}
|
|
4 => {
|
|
bytes[current_idx..current_idx + 4].copy_from_slice(&self.counter.1.to_be_bytes());
|
|
}
|
|
// Should never happen
|
|
_ => panic!("invalid counter width value"),
|
|
}
|
|
current_idx += self.counter.0 as usize;
|
|
if let Some(fractions) = self.fractions {
|
|
match fractions.0 {
|
|
FractionalResolution::FourMs => bytes[current_idx] = fractions.1 as u8,
|
|
FractionalResolution::FifteenUs => bytes[current_idx..current_idx + 2]
|
|
.copy_from_slice(&(fractions.1 as u16).to_be_bytes()),
|
|
FractionalResolution::SixtyNs => bytes[current_idx..current_idx + 3]
|
|
.copy_from_slice(&fractions.1.to_be_bytes()[1..4]),
|
|
// Should also never happen
|
|
_ => panic!("invalid fractions value"),
|
|
}
|
|
current_idx += fractions.0 as usize;
|
|
}
|
|
Ok(current_idx)
|
|
}
|
|
}
|
|
|
|
impl CcsdsTimeProvider for TimeProviderCcsdsEpoch {
|
|
fn len_as_bytes(&self) -> usize {
|
|
Self::len_packed_from_pfield(self.pfield)
|
|
}
|
|
|
|
fn p_field(&self) -> (usize, [u8; 2]) {
|
|
(1, [self.pfield, 0])
|
|
}
|
|
|
|
fn ccdsd_time_code(&self) -> CcsdsTimeCodes {
|
|
CcsdsTimeCodes::CucCcsdsEpoch
|
|
}
|
|
|
|
fn unix_seconds(&self) -> i64 {
|
|
self.unix_seconds()
|
|
}
|
|
|
|
fn subsecond_millis(&self) -> Option<u16> {
|
|
if let Some(fractions) = self.fractions {
|
|
if fractions.0 == FractionalResolution::Seconds {
|
|
return None;
|
|
}
|
|
// Rounding down here is the correct approach.
|
|
return Some((convert_fractional_part_to_ns(fractions) / 10_u32.pow(6) as u64) as u16);
|
|
}
|
|
None
|
|
}
|
|
|
|
fn date_time(&self) -> Option<DateTime<Utc>> {
|
|
let unix_seconds = self.unix_seconds();
|
|
let ns = if let Some(fractional_part) = self.fractions {
|
|
convert_fractional_part_to_ns(fractional_part)
|
|
} else {
|
|
0
|
|
};
|
|
if let LocalResult::Single(res) = Utc.timestamp_opt(unix_seconds, ns as u32) {
|
|
return Some(res);
|
|
}
|
|
None
|
|
}
|
|
}
|
|
|
|
fn get_provider_values_after_duration_addition(
|
|
provider: &TimeProviderCcsdsEpoch,
|
|
duration: Duration,
|
|
) -> (u32, Option<FractionalPart>) {
|
|
let mut new_counter = provider.counter.1;
|
|
let subsec_nanos = duration.subsec_nanos();
|
|
let mut increment_counter = |amount: u32| {
|
|
let mut sum: u64 = 0;
|
|
let mut counter_inc_handler = |max_val: u64| {
|
|
sum = new_counter as u64 + amount as u64;
|
|
if sum >= max_val {
|
|
new_counter = (sum % max_val) as u32;
|
|
return;
|
|
}
|
|
new_counter = sum as u32;
|
|
};
|
|
match provider.counter.0 {
|
|
1 => counter_inc_handler(u8::MAX as u64),
|
|
2 => counter_inc_handler(u16::MAX as u64),
|
|
3 => counter_inc_handler((2_u32.pow(24) - 1) as u64),
|
|
4 => counter_inc_handler(u32::MAX as u64),
|
|
_ => {
|
|
// Should never happen
|
|
panic!("invalid counter width")
|
|
}
|
|
}
|
|
};
|
|
let fractional_part = if let Some(fractional_part) = &provider.fractions {
|
|
let fractional_increment =
|
|
fractional_part_from_subsec_ns(fractional_part.0, subsec_nanos as u64).unwrap();
|
|
let mut increment_fractions = |resolution| {
|
|
let mut new_fractions = fractional_part.1 + fractional_increment.1;
|
|
let max_fractions = fractional_res_to_div(resolution);
|
|
if new_fractions > max_fractions {
|
|
increment_counter(1);
|
|
new_fractions -= max_fractions;
|
|
}
|
|
Some(FractionalPart(resolution, new_fractions))
|
|
};
|
|
match fractional_increment.0 {
|
|
FractionalResolution::Seconds => None,
|
|
_ => increment_fractions(fractional_increment.0),
|
|
}
|
|
} else {
|
|
None
|
|
};
|
|
increment_counter(duration.as_secs() as u32);
|
|
(new_counter, fractional_part)
|
|
}
|
|
|
|
impl AddAssign<Duration> for TimeProviderCcsdsEpoch {
|
|
fn add_assign(&mut self, duration: Duration) {
|
|
let (new_counter, new_fractional_part) =
|
|
get_provider_values_after_duration_addition(self, duration);
|
|
self.counter.1 = new_counter;
|
|
if self.fractions.is_some() {
|
|
self.fractions = new_fractional_part;
|
|
}
|
|
}
|
|
}
|
|
|
|
impl Add<Duration> for TimeProviderCcsdsEpoch {
|
|
type Output = Self;
|
|
|
|
fn add(self, duration: Duration) -> Self::Output {
|
|
let (new_counter, new_fractional_part) =
|
|
get_provider_values_after_duration_addition(&self, duration);
|
|
if let Some(fractional_part) = new_fractional_part {
|
|
// The generated fractional part should always be valid, so its okay to unwrap here.
|
|
return Self::new_with_fractions(new_counter, fractional_part).unwrap();
|
|
}
|
|
Self::new(new_counter)
|
|
}
|
|
}
|
|
|
|
impl Add<Duration> for &TimeProviderCcsdsEpoch {
|
|
type Output = TimeProviderCcsdsEpoch;
|
|
|
|
fn add(self, duration: Duration) -> Self::Output {
|
|
let (new_counter, new_fractional_part) =
|
|
get_provider_values_after_duration_addition(self, duration);
|
|
if let Some(fractional_part) = new_fractional_part {
|
|
// The generated fractional part should always be valid, so its okay to unwrap here.
|
|
return Self::Output::new_with_fractions(new_counter, fractional_part).unwrap();
|
|
}
|
|
Self::Output::new(new_counter)
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
use chrono::{Datelike, Timelike};
|
|
#[allow(unused_imports)]
|
|
use std::println;
|
|
|
|
#[test]
|
|
fn test_basic_zero_epoch() {
|
|
let zero_cuc = TimeProviderCcsdsEpoch::new(0);
|
|
assert_eq!(zero_cuc.len_as_bytes(), 5);
|
|
assert_eq!(zero_cuc.ccdsd_time_code(), CcsdsTimeCodes::CucCcsdsEpoch);
|
|
let counter = zero_cuc.width_counter_pair();
|
|
assert_eq!(counter.0, 4);
|
|
assert_eq!(counter.1, 0);
|
|
let fractions = zero_cuc.width_fractions_pair();
|
|
assert!(fractions.is_none());
|
|
let dt = zero_cuc.date_time();
|
|
assert!(dt.is_some());
|
|
let dt = dt.unwrap();
|
|
assert_eq!(dt.year(), 1958);
|
|
assert_eq!(dt.month(), 1);
|
|
assert_eq!(dt.day(), 1);
|
|
assert_eq!(dt.hour(), 0);
|
|
assert_eq!(dt.minute(), 0);
|
|
assert_eq!(dt.second(), 0);
|
|
}
|
|
|
|
#[test]
|
|
fn test_write_no_fractions() {
|
|
let mut buf: [u8; 16] = [0; 16];
|
|
let zero_cuc = TimeProviderCcsdsEpoch::new_generic(WidthCounterPair(4, 0x20102030), None);
|
|
assert!(zero_cuc.is_ok());
|
|
let zero_cuc = zero_cuc.unwrap();
|
|
let res = zero_cuc.write_to_bytes(&mut buf);
|
|
assert!(res.is_ok());
|
|
assert!(zero_cuc.subsecond_millis().is_none());
|
|
assert_eq!(zero_cuc.len_as_bytes(), 5);
|
|
assert_eq!(pfield_len(buf[0]), 1);
|
|
let written = res.unwrap();
|
|
assert_eq!(written, 5);
|
|
assert_eq!((buf[0] >> 7) & 0b1, 0);
|
|
let time_code = ccsds_time_code_from_p_field(buf[0]);
|
|
assert!(time_code.is_ok());
|
|
assert_eq!(time_code.unwrap(), CcsdsTimeCodes::CucCcsdsEpoch);
|
|
assert_eq!((buf[0] >> 2) & 0b11, 0b11);
|
|
assert_eq!(buf[0] & 0b11, 0);
|
|
let raw_counter = u32::from_be_bytes(buf[1..5].try_into().unwrap());
|
|
assert_eq!(raw_counter, 0x20102030);
|
|
assert_eq!(buf[5], 0);
|
|
}
|
|
|
|
#[test]
|
|
fn test_datetime_now() {
|
|
let now = Utc::now();
|
|
let cuc_now = TimeProviderCcsdsEpoch::from_now(FractionalResolution::SixtyNs);
|
|
assert!(cuc_now.is_ok());
|
|
let cuc_now = cuc_now.unwrap();
|
|
let dt_opt = cuc_now.date_time();
|
|
assert!(dt_opt.is_some());
|
|
let dt = dt_opt.unwrap();
|
|
let diff = dt - now;
|
|
assert!(diff.num_milliseconds() < 1000);
|
|
println!("datetime from cuc: {}", dt);
|
|
println!("datetime now: {}", now);
|
|
}
|
|
|
|
#[test]
|
|
fn test_read_no_fractions() {
|
|
let mut buf: [u8; 16] = [0; 16];
|
|
let zero_cuc =
|
|
TimeProviderCcsdsEpoch::new_generic(WidthCounterPair(4, 0x20102030), None).unwrap();
|
|
zero_cuc.write_to_bytes(&mut buf).unwrap();
|
|
let cuc_read_back =
|
|
TimeProviderCcsdsEpoch::from_bytes(&buf).expect("reading cuc timestamp failed");
|
|
assert_eq!(cuc_read_back, zero_cuc);
|
|
assert_eq!(cuc_read_back.width_counter_pair().1, 0x20102030);
|
|
assert_eq!(cuc_read_back.width_fractions_pair(), None);
|
|
}
|
|
|
|
#[test]
|
|
fn invalid_read_len() {
|
|
let mut buf: [u8; 16] = [0; 16];
|
|
for i in 0..2 {
|
|
let res = TimeProviderCcsdsEpoch::from_bytes(&buf[0..i]);
|
|
assert!(res.is_err());
|
|
let err = res.unwrap_err();
|
|
if let TimestampError::ByteConversion(ByteConversionError::FromSliceTooSmall(e)) = err {
|
|
assert_eq!(e.found, i);
|
|
assert_eq!(e.expected, 2);
|
|
}
|
|
}
|
|
let large_stamp = TimeProviderCcsdsEpoch::new_with_fine_fractions(22, 300).unwrap();
|
|
large_stamp.write_to_bytes(&mut buf).unwrap();
|
|
for i in 2..large_stamp.len_as_bytes() - 1 {
|
|
let res = TimeProviderCcsdsEpoch::from_bytes(&buf[0..i]);
|
|
assert!(res.is_err());
|
|
let err = res.unwrap_err();
|
|
if let TimestampError::ByteConversion(ByteConversionError::FromSliceTooSmall(e)) = err {
|
|
assert_eq!(e.found, i);
|
|
assert_eq!(e.expected, large_stamp.len_as_bytes());
|
|
}
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
fn write_and_read_tiny_stamp() {
|
|
let mut buf = [0; 2];
|
|
let cuc = TimeProviderCcsdsEpoch::new_generic(WidthCounterPair(1, 200), None);
|
|
assert!(cuc.is_ok());
|
|
let cuc = cuc.unwrap();
|
|
assert_eq!(cuc.len_as_bytes(), 2);
|
|
let res = cuc.write_to_bytes(&mut buf);
|
|
assert!(res.is_ok());
|
|
let written = res.unwrap();
|
|
assert_eq!(written, 2);
|
|
assert_eq!(buf[1], 200);
|
|
let cuc_read_back = TimeProviderCcsdsEpoch::from_bytes(&buf);
|
|
assert!(cuc_read_back.is_ok());
|
|
let cuc_read_back = cuc_read_back.unwrap();
|
|
assert_eq!(cuc_read_back, cuc);
|
|
}
|
|
|
|
#[test]
|
|
fn write_slightly_larger_stamp() {
|
|
let mut buf = [0; 4];
|
|
let cuc = TimeProviderCcsdsEpoch::new_generic(WidthCounterPair(2, 40000), None);
|
|
assert!(cuc.is_ok());
|
|
let cuc = cuc.unwrap();
|
|
assert_eq!(cuc.len_as_bytes(), 3);
|
|
let res = cuc.write_to_bytes(&mut buf);
|
|
assert!(res.is_ok());
|
|
let written = res.unwrap();
|
|
assert_eq!(written, 3);
|
|
assert_eq!(u16::from_be_bytes(buf[1..3].try_into().unwrap()), 40000);
|
|
let cuc_read_back = TimeProviderCcsdsEpoch::from_bytes(&buf);
|
|
assert!(cuc_read_back.is_ok());
|
|
let cuc_read_back = cuc_read_back.unwrap();
|
|
assert_eq!(cuc_read_back, cuc);
|
|
}
|
|
|
|
#[test]
|
|
fn invalid_buf_len_for_read() {}
|
|
#[test]
|
|
fn write_read_three_byte_cntr_stamp() {
|
|
let mut buf = [0; 4];
|
|
let cuc = TimeProviderCcsdsEpoch::new_generic(WidthCounterPair(3, 2_u32.pow(24) - 2), None);
|
|
assert!(cuc.is_ok());
|
|
let cuc = cuc.unwrap();
|
|
assert_eq!(cuc.len_as_bytes(), 4);
|
|
let res = cuc.write_to_bytes(&mut buf);
|
|
assert!(res.is_ok());
|
|
let written = res.unwrap();
|
|
assert_eq!(written, 4);
|
|
let mut temp_buf = [0; 4];
|
|
temp_buf[1..4].copy_from_slice(&buf[1..4]);
|
|
assert_eq!(u32::from_be_bytes(temp_buf), 2_u32.pow(24) - 2);
|
|
let cuc_read_back = TimeProviderCcsdsEpoch::from_bytes(&buf);
|
|
assert!(cuc_read_back.is_ok());
|
|
let cuc_read_back = cuc_read_back.unwrap();
|
|
assert_eq!(cuc_read_back, cuc);
|
|
}
|
|
|
|
#[test]
|
|
fn test_write_invalid_buf() {
|
|
let mut buf: [u8; 16] = [0; 16];
|
|
let res = TimeProviderCcsdsEpoch::new_with_fine_fractions(0, 0);
|
|
let cuc = res.unwrap();
|
|
for i in 0..cuc.len_as_bytes() - 1 {
|
|
let err = cuc.write_to_bytes(&mut buf[0..i]);
|
|
assert!(err.is_err());
|
|
let err = err.unwrap_err();
|
|
if let TimestampError::ByteConversion(ByteConversionError::ToSliceTooSmall(e)) = err {
|
|
assert_eq!(e.expected, cuc.len_as_bytes());
|
|
assert_eq!(e.found, i);
|
|
} else {
|
|
panic!("unexpected error: {}", err);
|
|
}
|
|
}
|
|
}
|
|
#[test]
|
|
fn invalid_ccsds_stamp_type() {
|
|
let mut buf: [u8; 16] = [0; 16];
|
|
buf[0] |= (CcsdsTimeCodes::CucAgencyEpoch as u8) << 4;
|
|
let res = TimeProviderCcsdsEpoch::from_bytes(&buf);
|
|
assert!(res.is_err());
|
|
let err = res.unwrap_err();
|
|
if let TimestampError::InvalidTimeCode(code, raw) = err {
|
|
assert_eq!(code, CcsdsTimeCodes::CucCcsdsEpoch);
|
|
assert_eq!(raw, CcsdsTimeCodes::CucAgencyEpoch as u8);
|
|
} else {
|
|
panic!("unexpected error: {}", err);
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
fn test_write_with_coarse_fractions() {
|
|
let mut buf: [u8; 16] = [0; 16];
|
|
let cuc = TimeProviderCcsdsEpoch::new_with_coarse_fractions(0x30201060, 120);
|
|
assert!(cuc.fractions.is_some());
|
|
assert_eq!(cuc.fractions.unwrap().1, 120);
|
|
assert_eq!(cuc.fractions.unwrap().0, FractionalResolution::FourMs);
|
|
let res = cuc.write_to_bytes(&mut buf);
|
|
assert!(res.is_ok());
|
|
let written = res.unwrap();
|
|
assert_eq!(written, 6);
|
|
assert_eq!(buf[5], 120);
|
|
assert_eq!(buf[6], 0);
|
|
assert_eq!(
|
|
u32::from_be_bytes(buf[1..5].try_into().unwrap()),
|
|
0x30201060
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn test_read_with_coarse_fractions() {
|
|
let mut buf: [u8; 16] = [0; 16];
|
|
let cuc = TimeProviderCcsdsEpoch::new_with_coarse_fractions(0x30201060, 120);
|
|
let res = cuc.write_to_bytes(&mut buf);
|
|
assert!(res.is_ok());
|
|
let res = TimeProviderCcsdsEpoch::from_bytes(&buf);
|
|
assert!(res.is_ok());
|
|
let read_back = res.unwrap();
|
|
assert_eq!(read_back, cuc);
|
|
}
|
|
|
|
#[test]
|
|
fn test_write_with_medium_fractions() {
|
|
let mut buf: [u8; 16] = [0; 16];
|
|
let cuc = TimeProviderCcsdsEpoch::new_with_medium_fractions(0x30303030, 30000);
|
|
let res = cuc.write_to_bytes(&mut buf);
|
|
assert!(res.is_ok());
|
|
let written = res.unwrap();
|
|
assert_eq!(written, 7);
|
|
assert_eq!(u16::from_be_bytes(buf[5..7].try_into().unwrap()), 30000);
|
|
assert_eq!(buf[7], 0);
|
|
}
|
|
|
|
#[test]
|
|
fn test_read_with_medium_fractions() {
|
|
let mut buf: [u8; 16] = [0; 16];
|
|
let cuc = TimeProviderCcsdsEpoch::new_with_medium_fractions(0x30303030, 30000);
|
|
let res = cuc.write_to_bytes(&mut buf);
|
|
assert!(res.is_ok());
|
|
let res = TimeProviderCcsdsEpoch::from_bytes(&buf);
|
|
assert!(res.is_ok());
|
|
let cuc_read_back = res.unwrap();
|
|
assert_eq!(cuc_read_back, cuc);
|
|
}
|
|
|
|
#[test]
|
|
fn test_write_with_fine_fractions() {
|
|
let mut buf: [u8; 16] = [0; 16];
|
|
let cuc =
|
|
TimeProviderCcsdsEpoch::new_with_fine_fractions(0x30303030, u16::MAX as u32 + 60000);
|
|
assert!(cuc.is_ok());
|
|
let cuc = cuc.unwrap();
|
|
let res = cuc.write_to_bytes(&mut buf);
|
|
let written = res.unwrap();
|
|
assert_eq!(written, 8);
|
|
let mut dummy_buf: [u8; 4] = [0; 4];
|
|
dummy_buf[1..4].copy_from_slice(&buf[5..8]);
|
|
assert_eq!(u32::from_be_bytes(dummy_buf), u16::MAX as u32 + 60000);
|
|
assert_eq!(buf[8], 0);
|
|
}
|
|
|
|
#[test]
|
|
fn test_read_with_fine_fractions() {
|
|
let mut buf: [u8; 16] = [0; 16];
|
|
let cuc =
|
|
TimeProviderCcsdsEpoch::new_with_fine_fractions(0x30303030, u16::MAX as u32 + 60000);
|
|
assert!(cuc.is_ok());
|
|
let cuc = cuc.unwrap();
|
|
let res = cuc.write_to_bytes(&mut buf);
|
|
assert!(res.is_ok());
|
|
let res = TimeProviderCcsdsEpoch::from_bytes(&buf);
|
|
assert!(res.is_ok());
|
|
let cuc_read_back = res.unwrap();
|
|
assert_eq!(cuc_read_back, cuc);
|
|
}
|
|
|
|
#[test]
|
|
fn test_fractional_converter() {
|
|
let ns = convert_fractional_part_to_ns(FractionalPart(FractionalResolution::FourMs, 2));
|
|
// The formula for this is 2/255 * 10e9 = 7.843.137.
|
|
assert_eq!(ns, 7843137);
|
|
// This is the largest value we should be able to pass without this function panicking.
|
|
let ns = convert_fractional_part_to_ns(FractionalPart(
|
|
FractionalResolution::SixtyNs,
|
|
2_u32.pow(24) - 2,
|
|
));
|
|
assert_eq!(ns, 999999940);
|
|
}
|
|
|
|
#[test]
|
|
#[should_panic]
|
|
fn test_fractional_converter_invalid_input() {
|
|
convert_fractional_part_to_ns(FractionalPart(FractionalResolution::FourMs, 256));
|
|
}
|
|
|
|
#[test]
|
|
#[should_panic]
|
|
fn test_fractional_converter_invalid_input_2() {
|
|
convert_fractional_part_to_ns(FractionalPart(
|
|
FractionalResolution::SixtyNs,
|
|
2_u32.pow(32) - 1,
|
|
));
|
|
}
|
|
|
|
#[test]
|
|
fn fractional_part_formula() {
|
|
let fractional_part =
|
|
fractional_part_from_subsec_ns(FractionalResolution::FourMs, 7843138).unwrap();
|
|
assert_eq!(fractional_part.1, 2);
|
|
}
|
|
|
|
#[test]
|
|
fn fractional_part_formula_2() {
|
|
let fractional_part =
|
|
fractional_part_from_subsec_ns(FractionalResolution::FourMs, 12000000).unwrap();
|
|
assert_eq!(fractional_part.1, 3);
|
|
}
|
|
|
|
#[test]
|
|
fn fractional_part_formula_3() {
|
|
let one_fraction_with_width_two_in_ns =
|
|
10_u64.pow(9) as f64 / (2_u32.pow(8 * 2) - 1) as f64;
|
|
assert_eq!(one_fraction_with_width_two_in_ns.ceil(), 15260.0);
|
|
let hundred_fractions_and_some =
|
|
(100.0 * one_fraction_with_width_two_in_ns).floor() as u64 + 7000;
|
|
let fractional_part = fractional_part_from_subsec_ns(
|
|
FractionalResolution::FifteenUs,
|
|
hundred_fractions_and_some,
|
|
)
|
|
.unwrap();
|
|
assert_eq!(fractional_part.1, 100);
|
|
// Using exactly 101.0 can yield values which will later be rounded down to 100
|
|
let hundred_and_one_fractions =
|
|
(101.001 * one_fraction_with_width_two_in_ns).floor() as u64;
|
|
let fractional_part = fractional_part_from_subsec_ns(
|
|
FractionalResolution::FifteenUs,
|
|
hundred_and_one_fractions,
|
|
)
|
|
.unwrap();
|
|
assert_eq!(fractional_part.1, 101);
|
|
}
|
|
|
|
#[test]
|
|
fn update_fractions() {
|
|
let mut stamp = TimeProviderCcsdsEpoch::new(2000);
|
|
let res = stamp.set_fractions(FractionalPart(FractionalResolution::SixtyNs, 5000));
|
|
assert!(res.is_ok());
|
|
assert!(stamp.fractions.is_some());
|
|
let fractions = stamp.fractions.unwrap();
|
|
assert_eq!(fractions.0, FractionalResolution::SixtyNs);
|
|
assert_eq!(fractions.1, 5000);
|
|
}
|
|
|
|
#[test]
|
|
fn set_fract_resolution() {
|
|
let mut stamp = TimeProviderCcsdsEpoch::new(2000);
|
|
stamp.set_fractional_resolution(FractionalResolution::SixtyNs);
|
|
assert!(stamp.fractions.is_some());
|
|
let fractions = stamp.fractions.unwrap();
|
|
assert_eq!(fractions.0, FractionalResolution::SixtyNs);
|
|
assert_eq!(fractions.1, 0);
|
|
let res = stamp.update_from_now();
|
|
assert!(res.is_ok());
|
|
}
|
|
|
|
#[test]
|
|
fn assert_largest_fractions() {
|
|
let fractions =
|
|
fractional_part_from_subsec_ns(FractionalResolution::SixtyNs, 10u64.pow(9) - 1)
|
|
.unwrap();
|
|
// The value can not be larger than representable by 3 bytes
|
|
// Assert that the maximum resolution can be reached
|
|
assert_eq!(fractions.1, 2_u32.pow(3 * 8) - 2);
|
|
}
|
|
|
|
#[test]
|
|
fn add_duration_basic() {
|
|
let mut cuc_stamp = TimeProviderCcsdsEpoch::new(200);
|
|
cuc_stamp.set_fractional_resolution(FractionalResolution::FifteenUs);
|
|
let duration = Duration::from_millis(2500);
|
|
cuc_stamp += duration;
|
|
assert_eq!(cuc_stamp.width_counter_pair().1, 202);
|
|
let fractions = cuc_stamp.width_fractions_pair().unwrap().1;
|
|
let expected_val =
|
|
(0.5 * fractional_res_to_div(FractionalResolution::FifteenUs) as f64).floor() as u32;
|
|
assert_eq!(fractions, expected_val);
|
|
let cuc_stamp2 = cuc_stamp + Duration::from_millis(501);
|
|
// What I would roughly expect
|
|
assert_eq!(cuc_stamp2.counter.1, 203);
|
|
assert!(cuc_stamp2.fractions.unwrap().1 < 100);
|
|
assert!(cuc_stamp2.subsecond_millis().unwrap() <= 1);
|
|
}
|
|
|
|
#[test]
|
|
fn add_duration_overflow() {
|
|
let mut cuc_stamp =
|
|
TimeProviderCcsdsEpoch::new_generic(WidthCounterPair(1, 255), None).unwrap();
|
|
let duration = Duration::from_secs(10);
|
|
cuc_stamp += duration;
|
|
assert_eq!(cuc_stamp.counter.1, 10);
|
|
}
|
|
}
|