560 lines
18 KiB
Rust
560 lines
18 KiB
Rust
//! CCSDS Time Code Formats according to [CCSDS 301.0-B-4](https://public.ccsds.org/Pubs/301x0b4e1.pdf)
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use crate::{ByteConversionError, SizeMissmatch};
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use chrono::{DateTime, LocalResult, TimeZone, Utc};
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use core::cmp::Ordering;
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use core::fmt::{Display, Formatter};
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use core::ops::{Add, AddAssign};
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use core::time::Duration;
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#[allow(unused_imports)]
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#[cfg(not(feature = "std"))]
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use num_traits::float::FloatCore;
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#[cfg(feature = "serde")]
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use serde::{Deserialize, Serialize};
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#[cfg(feature = "std")]
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use std::error::Error;
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#[cfg(feature = "std")]
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use std::time::{SystemTime, SystemTimeError};
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pub mod ascii;
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pub mod cds;
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pub mod cuc;
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pub const DAYS_CCSDS_TO_UNIX: i32 = -4383;
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pub const SECONDS_PER_DAY: u32 = 86400;
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pub const MS_PER_DAY: u32 = SECONDS_PER_DAY * 1000;
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#[derive(Debug, PartialEq, Eq, Copy, Clone)]
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#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
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pub enum CcsdsTimeCodes {
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CucCcsdsEpoch = 0b001,
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CucAgencyEpoch = 0b010,
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Cds = 0b100,
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Ccs = 0b101,
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AgencyDefined = 0b110,
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}
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impl TryFrom<u8> for CcsdsTimeCodes {
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type Error = ();
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fn try_from(value: u8) -> Result<Self, Self::Error> {
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match value {
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x if x == CcsdsTimeCodes::CucCcsdsEpoch as u8 => Ok(CcsdsTimeCodes::CucCcsdsEpoch),
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x if x == CcsdsTimeCodes::CucAgencyEpoch as u8 => Ok(CcsdsTimeCodes::CucAgencyEpoch),
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x if x == CcsdsTimeCodes::Cds as u8 => Ok(CcsdsTimeCodes::Cds),
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x if x == CcsdsTimeCodes::Ccs as u8 => Ok(CcsdsTimeCodes::Ccs),
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x if x == CcsdsTimeCodes::AgencyDefined as u8 => Ok(CcsdsTimeCodes::AgencyDefined),
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_ => Err(()),
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}
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}
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}
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/// Retrieve the CCSDS time code from the p-field. If no valid time code identifier is found, the
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/// value of the raw time code identification field is returned.
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pub fn ccsds_time_code_from_p_field(pfield: u8) -> Result<CcsdsTimeCodes, u8> {
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let raw_bits = (pfield >> 4) & 0b111;
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CcsdsTimeCodes::try_from(raw_bits).map_err(|_| raw_bits)
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}
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#[derive(Debug, PartialEq, Eq, Copy, Clone)]
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#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
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#[non_exhaustive]
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pub enum TimestampError {
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/// Contains tuple where first value is the expected time code and the second
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/// value is the found raw value
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InvalidTimeCode(CcsdsTimeCodes, u8),
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ByteConversionError(ByteConversionError),
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CdsError(cds::CdsError),
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CucError(cuc::CucError),
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DateBeforeCcsdsEpoch(DateTime<Utc>),
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CustomEpochNotSupported,
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}
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impl From<cds::CdsError> for TimestampError {
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fn from(e: cds::CdsError) -> Self {
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TimestampError::CdsError(e)
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}
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}
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impl From<cuc::CucError> for TimestampError {
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fn from(e: cuc::CucError) -> Self {
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TimestampError::CucError(e)
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}
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}
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#[cfg(feature = "std")]
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#[cfg_attr(doc_cfg, doc(cfg(feature = "std")))]
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#[derive(Debug, Clone)]
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pub enum StdTimestampError {
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SystemTimeError(SystemTimeError),
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TimestampError(TimestampError),
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}
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#[cfg(feature = "std")]
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impl From<TimestampError> for StdTimestampError {
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fn from(v: TimestampError) -> Self {
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Self::TimestampError(v)
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}
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}
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#[cfg(feature = "std")]
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impl From<SystemTimeError> for StdTimestampError {
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fn from(v: SystemTimeError) -> Self {
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Self::SystemTimeError(v)
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}
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}
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impl Display for TimestampError {
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fn fmt(&self, f: &mut Formatter<'_>) -> core::fmt::Result {
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match self {
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TimestampError::InvalidTimeCode(time_code, raw_val) => {
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write!(
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f,
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"invalid raw time code value {raw_val} for time code {time_code:?}"
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)
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}
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TimestampError::CdsError(e) => {
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write!(f, "cds error {e}")
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}
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TimestampError::CucError(e) => {
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write!(f, "cuc error {e}")
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}
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TimestampError::ByteConversionError(e) => {
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write!(f, "byte conversion error {e}")
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}
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TimestampError::DateBeforeCcsdsEpoch(e) => {
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write!(f, "datetime with date before ccsds epoch: {e}")
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}
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TimestampError::CustomEpochNotSupported => {
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write!(f, "custom epochs are not supported")
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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 TimestampError {
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fn source(&self) -> Option<&(dyn Error + 'static)> {
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match self {
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TimestampError::ByteConversionError(e) => Some(e),
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TimestampError::CdsError(e) => Some(e),
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TimestampError::CucError(e) => Some(e),
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_ => None,
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}
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}
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}
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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 seconds_since_epoch() -> f64 {
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SystemTime::now()
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.duration_since(SystemTime::UNIX_EPOCH)
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.expect("System time generation failed")
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.as_secs_f64()
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}
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/// Convert UNIX days to CCSDS days
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///
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/// - CCSDS epoch: 1958-01-01T00:00:00+00:00
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/// - UNIX Epoch: 1970-01-01T00:00:00+00:00
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pub const fn unix_to_ccsds_days(unix_days: i64) -> i64 {
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unix_days - DAYS_CCSDS_TO_UNIX as i64
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}
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/// Convert CCSDS days to UNIX days
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///
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/// - CCSDS epoch: 1958-01-01T00:00:00+00:00
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/// - UNIX Epoch: 1970-01-01T00:00:00+00:00
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pub const fn ccsds_to_unix_days(ccsds_days: i64) -> i64 {
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ccsds_days + DAYS_CCSDS_TO_UNIX as i64
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}
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/// Similar to [unix_to_ccsds_days] but converts the epoch instead, which is the number of elpased
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/// seconds since the CCSDS and UNIX epoch times.
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pub const fn unix_epoch_to_ccsds_epoch(unix_epoch: i64) -> i64 {
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unix_epoch - (DAYS_CCSDS_TO_UNIX as i64 * SECONDS_PER_DAY as i64)
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}
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pub const fn ccsds_epoch_to_unix_epoch(ccsds_epoch: i64) -> i64 {
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ccsds_epoch + (DAYS_CCSDS_TO_UNIX as i64 * SECONDS_PER_DAY as i64)
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}
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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 ms_of_day_using_sysclock() -> u32 {
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ms_of_day(seconds_since_epoch())
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}
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pub fn ms_of_day(seconds_since_epoch: f64) -> u32 {
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let fraction_ms = seconds_since_epoch - seconds_since_epoch.floor();
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let ms_of_day: u32 = (((seconds_since_epoch.floor() as u32 % SECONDS_PER_DAY) * 1000) as f64
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+ fraction_ms)
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.floor() as u32;
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ms_of_day
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}
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pub trait TimeWriter {
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/// Generic function to convert write a timestamp into a raw buffer.
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/// Returns the number of written bytes on success.
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fn write_to_bytes(&self, bytes: &mut [u8]) -> Result<usize, TimestampError>;
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}
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pub trait TimeReader {
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fn from_bytes(buf: &[u8]) -> Result<Self, TimestampError>
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where
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Self: Sized;
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}
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/// Trait for generic CCSDS time providers.
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///
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/// The UNIX helper methods and the [Self::date_time] method are not strictly necessary but extremely
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/// practical because they are a very common and simple exchange format for time information.
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pub trait CcsdsTimeProvider {
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fn len_as_bytes(&self) -> usize;
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/// Returns the pfield of the time provider. The pfield can have one or two bytes depending
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/// on the extension bit (first bit). The time provider should returns a tuple where the first
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/// entry denotes the length of the pfield and the second entry is the value of the pfield
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/// in big endian format.
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fn p_field(&self) -> (usize, [u8; 2]);
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fn ccdsd_time_code(&self) -> CcsdsTimeCodes;
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fn unix_seconds(&self) -> i64;
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fn subsecond_millis(&self) -> Option<u16>;
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fn unix_stamp(&self) -> UnixTimestamp {
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UnixTimestamp {
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unix_seconds: self.unix_seconds(),
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subsecond_millis: self.subsecond_millis(),
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}
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}
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fn date_time(&self) -> Option<DateTime<Utc>>;
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}
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/// UNIX timestamp: Elapsed seconds since 1970-01-01T00:00:00+00:00.
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///
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/// Also can optionally include subsecond millisecond for greater accuracy. Please note that a
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/// subsecond millisecond value of 0 gets converted to [None].
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#[derive(Default, Debug, Copy, Clone, PartialEq, Eq)]
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#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
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pub struct UnixTimestamp {
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pub unix_seconds: i64,
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subsecond_millis: Option<u16>,
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}
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impl UnixTimestamp {
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/// Returns none if the subsecond millisecond value is larger than 999. 0 is converted to
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/// a [None] value.
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pub fn new(unix_seconds: i64, subsec_millis: u16) -> Option<Self> {
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if subsec_millis > 999 {
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return None;
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}
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Some(Self::const_new(unix_seconds, subsec_millis))
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}
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/// Like [Self::new] but const. Panics if the subsecond value is larger than 999.
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pub const fn const_new(unix_seconds: i64, subsec_millis: u16) -> Self {
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if subsec_millis > 999 {
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panic!("subsec milliseconds exceeds 999");
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}
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let subsecond_millis = if subsec_millis == 0 {
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None
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} else {
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Some(subsec_millis)
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};
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Self {
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unix_seconds,
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subsecond_millis,
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}
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}
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pub fn new_only_seconds(unix_seconds: i64) -> Self {
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Self {
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unix_seconds,
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subsecond_millis: None,
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}
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}
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pub fn subsecond_millis(&self) -> Option<u16> {
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self.subsecond_millis
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}
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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() -> Result<Self, SystemTimeError> {
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let now = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH)?;
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let epoch = now.as_secs();
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Ok(UnixTimestamp {
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unix_seconds: epoch as i64,
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subsecond_millis: Some(now.subsec_millis() as u16),
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})
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}
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#[inline]
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pub fn unix_seconds_f64(&self) -> f64 {
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let mut secs = self.unix_seconds as f64;
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if let Some(subsec_millis) = self.subsecond_millis {
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secs += subsec_millis as f64 / 1000.0;
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}
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secs
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}
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pub fn as_date_time(&self) -> LocalResult<DateTime<Utc>> {
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Utc.timestamp_opt(
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self.unix_seconds,
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self.subsecond_millis.unwrap_or(0) as u32 * 10_u32.pow(6),
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)
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}
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}
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impl From<DateTime<Utc>> for UnixTimestamp {
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fn from(value: DateTime<Utc>) -> Self {
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Self {
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unix_seconds: value.timestamp(),
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subsecond_millis: Some(value.timestamp_subsec_millis() as u16),
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}
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}
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}
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impl PartialOrd for UnixTimestamp {
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fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
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if self == other {
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return Some(Ordering::Equal);
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}
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match self.unix_seconds.cmp(&other.unix_seconds) {
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Ordering::Less => return Some(Ordering::Less),
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Ordering::Greater => return Some(Ordering::Greater),
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_ => (),
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}
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match self
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.subsecond_millis()
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.unwrap_or(0)
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.cmp(&other.subsecond_millis().unwrap_or(0))
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{
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Ordering::Less => {
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return if self.unix_seconds < 0 {
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Some(Ordering::Greater)
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} else {
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Some(Ordering::Less)
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}
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}
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Ordering::Greater => {
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return if self.unix_seconds < 0 {
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Some(Ordering::Less)
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} else {
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Some(Ordering::Greater)
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}
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}
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Ordering::Equal => (),
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}
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Some(Ordering::Equal)
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}
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}
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impl Ord for UnixTimestamp {
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fn cmp(&self, other: &Self) -> Ordering {
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PartialOrd::partial_cmp(self, other).unwrap()
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}
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}
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fn get_new_stamp_after_addition(
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current_stamp: &UnixTimestamp,
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duration: Duration,
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) -> UnixTimestamp {
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let mut new_subsec_millis =
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current_stamp.subsecond_millis().unwrap_or(0) + duration.subsec_millis() as u16;
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let mut new_unix_seconds = current_stamp.unix_seconds;
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let mut increment_seconds = |value: u32| {
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if new_unix_seconds < 0 {
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new_unix_seconds = new_unix_seconds
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.checked_sub(value.into())
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.expect("new unix seconds would exceed i64::MIN");
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} else {
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new_unix_seconds = new_unix_seconds
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.checked_add(value.into())
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.expect("new unix seconds would exceed i64::MAX");
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}
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};
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if new_subsec_millis >= 1000 {
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new_subsec_millis -= 1000;
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increment_seconds(1);
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}
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increment_seconds(
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duration
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.as_secs()
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.try_into()
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.expect("duration seconds exceeds u32::MAX"),
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);
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UnixTimestamp::const_new(new_unix_seconds, new_subsec_millis)
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}
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/// Please note that this operation will panic on the following conditions:
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///
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/// - Unix seconds after subtraction for stamps before the unix epoch exceeds [i64::MIN].
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/// - Unix seconds after addition exceeds [i64::MAX].
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/// - Seconds from duration to add exceeds [u32::MAX].
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impl AddAssign<Duration> for UnixTimestamp {
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fn add_assign(&mut self, duration: Duration) {
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*self = get_new_stamp_after_addition(self, duration);
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}
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}
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/// Please note that this operation will panic for the following conditions:
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///
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/// - Unix seconds after subtraction for stamps before the unix epoch exceeds [i64::MIN].
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/// - Unix seconds after addition exceeds [i64::MAX].
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/// - Unix seconds exceeds [u32::MAX].
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impl Add<Duration> for UnixTimestamp {
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type Output = Self;
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fn add(self, duration: Duration) -> Self::Output {
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get_new_stamp_after_addition(&self, duration)
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}
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}
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impl Add<Duration> for &UnixTimestamp {
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type Output = UnixTimestamp;
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fn add(self, duration: Duration) -> Self::Output {
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get_new_stamp_after_addition(self, duration)
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}
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}
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#[cfg(all(test, feature = "std"))]
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mod tests {
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use super::*;
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#[test]
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fn test_days_conversion() {
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assert_eq!(unix_to_ccsds_days(DAYS_CCSDS_TO_UNIX.into()), 0);
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assert_eq!(ccsds_to_unix_days(0), DAYS_CCSDS_TO_UNIX.into());
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}
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#[test]
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fn test_get_current_time() {
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let sec_floats = seconds_since_epoch();
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assert!(sec_floats > 0.0);
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}
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#[test]
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fn test_ccsds_epoch() {
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let now = SystemTime::now()
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.duration_since(SystemTime::UNIX_EPOCH)
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.unwrap();
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let unix_epoch = now.as_secs();
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let ccsds_epoch = unix_epoch_to_ccsds_epoch(now.as_secs() as i64) as u64;
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assert!(ccsds_epoch > unix_epoch);
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assert_eq!((ccsds_epoch - unix_epoch) % SECONDS_PER_DAY as u64, 0);
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let days_diff = (ccsds_epoch - unix_epoch) / SECONDS_PER_DAY as u64;
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assert_eq!(days_diff, -DAYS_CCSDS_TO_UNIX as u64);
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}
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#[test]
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fn basic_unix_stamp_test() {
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let stamp = UnixTimestamp::new_only_seconds(-200);
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assert_eq!(stamp.unix_seconds, -200);
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assert!(stamp.subsecond_millis().is_none());
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let stamp = UnixTimestamp::new_only_seconds(250);
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assert_eq!(stamp.unix_seconds, 250);
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assert!(stamp.subsecond_millis().is_none());
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}
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#[test]
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fn basic_float_unix_stamp_test() {
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let stamp = UnixTimestamp::new(500, 600).unwrap();
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assert!(stamp.subsecond_millis.is_some());
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assert_eq!(stamp.unix_seconds, 500);
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let subsec_millis = stamp.subsecond_millis().unwrap();
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assert_eq!(subsec_millis, 600);
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assert!((500.6 - stamp.unix_seconds_f64()).abs() < 0.0001);
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}
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#[test]
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fn test_ord_larger() {
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let stamp0 = UnixTimestamp::new_only_seconds(5);
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let stamp1 = UnixTimestamp::new(5, 500).unwrap();
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let stamp2 = UnixTimestamp::new_only_seconds(6);
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assert!(stamp1 > stamp0);
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assert!(stamp2 > stamp0);
|
|
assert!(stamp2 > stamp1);
|
|
}
|
|
|
|
#[test]
|
|
fn test_ord_smaller() {
|
|
let stamp0 = UnixTimestamp::new_only_seconds(5);
|
|
let stamp1 = UnixTimestamp::new(5, 500).unwrap();
|
|
let stamp2 = UnixTimestamp::new_only_seconds(6);
|
|
assert!(stamp0 < stamp1);
|
|
assert!(stamp0 < stamp2);
|
|
assert!(stamp1 < stamp2);
|
|
}
|
|
|
|
#[test]
|
|
fn test_ord_larger_neg_numbers() {
|
|
let stamp0 = UnixTimestamp::new_only_seconds(-5);
|
|
let stamp1 = UnixTimestamp::new(-5, 500).unwrap();
|
|
let stamp2 = UnixTimestamp::new_only_seconds(-6);
|
|
assert!(stamp0 > stamp1);
|
|
assert!(stamp0 > stamp2);
|
|
assert!(stamp1 > stamp2);
|
|
assert!(stamp1 >= stamp2);
|
|
assert!(stamp0 >= stamp1);
|
|
}
|
|
|
|
#[test]
|
|
fn test_ord_smaller_neg_numbers() {
|
|
let stamp0 = UnixTimestamp::new_only_seconds(-5);
|
|
let stamp1 = UnixTimestamp::new(-5, 500).unwrap();
|
|
let stamp2 = UnixTimestamp::new_only_seconds(-6);
|
|
assert!(stamp2 < stamp1);
|
|
assert!(stamp2 < stamp0);
|
|
assert!(stamp1 < stamp0);
|
|
assert!(stamp1 <= stamp0);
|
|
assert!(stamp2 <= stamp1);
|
|
}
|
|
|
|
#[test]
|
|
fn test_eq() {
|
|
let stamp0 = UnixTimestamp::new(5, 0).unwrap();
|
|
let stamp1 = UnixTimestamp::new_only_seconds(5);
|
|
assert_eq!(stamp0, stamp1);
|
|
assert!(stamp0 <= stamp1);
|
|
assert!(stamp0 >= stamp1);
|
|
assert!(!(stamp0 < stamp1));
|
|
assert!(!(stamp0 > stamp1));
|
|
}
|
|
|
|
#[test]
|
|
fn test_addition() {
|
|
let mut stamp0 = UnixTimestamp::new_only_seconds(1);
|
|
stamp0 += Duration::from_secs(5);
|
|
assert_eq!(stamp0.unix_seconds, 6);
|
|
assert!(stamp0.subsecond_millis().is_none());
|
|
let stamp1 = stamp0 + Duration::from_millis(500);
|
|
assert_eq!(stamp1.unix_seconds, 6);
|
|
assert!(stamp1.subsecond_millis().is_some());
|
|
assert_eq!(stamp1.subsecond_millis().unwrap(), 500);
|
|
}
|
|
|
|
#[test]
|
|
fn test_addition_on_ref() {
|
|
let stamp0 = &UnixTimestamp::new(20, 500).unwrap();
|
|
let stamp1 = stamp0 + Duration::from_millis(2500);
|
|
assert_eq!(stamp1.unix_seconds, 23);
|
|
assert!(stamp1.subsecond_millis().is_none());
|
|
}
|
|
|
|
#[test]
|
|
fn test_addition_spillover() {
|
|
let mut stamp0 = UnixTimestamp::new(1, 900).unwrap();
|
|
stamp0 += Duration::from_millis(100);
|
|
assert_eq!(stamp0.unix_seconds, 2);
|
|
assert!(stamp0.subsecond_millis().is_none());
|
|
stamp0 += Duration::from_millis(1100);
|
|
assert_eq!(stamp0.unix_seconds, 3);
|
|
assert_eq!(stamp0.subsecond_millis().unwrap(), 100);
|
|
}
|
|
}
|