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spacepackets/src/time.rs

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//! CCSDS Time Code Formats according to [CCSDS 301.0-B-4](https://public.ccsds.org/Pubs/301x0b4e1.pdf)
use crate::{ByteConversionError, SizeMissmatch};
use chrono::{DateTime, LocalResult, TimeZone, Utc};
use core::fmt::{Display, Formatter};
#[allow(unused_imports)]
#[cfg(not(feature = "std"))]
use num_traits::float::FloatCore;
#[cfg(feature = "std")]
use std::error::Error;
#[cfg(feature = "std")]
use std::time::{SystemTime, SystemTimeError};
use crate::time::cds::LengthOfDaySegment;
#[cfg(feature = "serde")]
use serde::{Deserialize, Serialize};
pub const DAYS_CCSDS_TO_UNIX: i32 = -4383;
pub const SECONDS_PER_DAY: u32 = 86400;
#[derive(Debug, PartialEq, Eq, Copy, Clone)]
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
pub enum CcsdsTimeCodes {
CucCcsdsEpoch = 0b001,
CucAgencyEpoch = 0b010,
Cds = 0b100,
Ccs = 0b101,
AgencyDefined = 0b110,
}
impl TryFrom<u8> for CcsdsTimeCodes {
type Error = ();
fn try_from(value: u8) -> Result<Self, Self::Error> {
match value {
x if x == CcsdsTimeCodes::CucCcsdsEpoch as u8 => Ok(CcsdsTimeCodes::CucCcsdsEpoch),
x if x == CcsdsTimeCodes::CucAgencyEpoch as u8 => Ok(CcsdsTimeCodes::CucAgencyEpoch),
x if x == CcsdsTimeCodes::Cds as u8 => Ok(CcsdsTimeCodes::Cds),
x if x == CcsdsTimeCodes::Ccs as u8 => Ok(CcsdsTimeCodes::Ccs),
x if x == CcsdsTimeCodes::AgencyDefined as u8 => Ok(CcsdsTimeCodes::AgencyDefined),
_ => Err(()),
}
}
}
/// Retrieve the CCSDS time code from the p-field. If no valid time code identifier is found, the
/// value of the raw time code identification field is returned.
pub fn ccsds_time_code_from_p_field(pfield: u8) -> Result<CcsdsTimeCodes, u8> {
let raw_bits = (pfield >> 4) & 0b111;
CcsdsTimeCodes::try_from(raw_bits).map_err(|_| raw_bits)
}
#[derive(Debug, PartialEq, Eq, Copy, Clone)]
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
pub enum CdsError {
/// CCSDS days value exceeds maximum allowed size or is negative
InvalidCcsdsDays(i64),
/// There are distinct constructors depending on the days field width detected in the preamble
/// field. This error will be returned if there is a missmatch.
InvalidCtorForDaysOfLenInPreamble(LengthOfDaySegment),
}
impl Display for CdsError {
fn fmt(&self, f: &mut Formatter<'_>) -> core::fmt::Result {
match self {
CdsError::InvalidCcsdsDays(days) => {
write!(f, "invalid ccsds days {}", days)
}
CdsError::InvalidCtorForDaysOfLenInPreamble(length_of_day) => {
write!(
f,
"wrong constructor for length of day {:?} detected in preamble",
length_of_day
)
}
}
}
}
#[cfg(feature = "std")]
impl Error for CdsError {}
#[derive(Debug, PartialEq, Eq, Copy, Clone)]
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
pub enum TimestampError {
/// Contains tuple where first value is the expected time code and the second
/// value is the found raw value
InvalidTimeCode(CcsdsTimeCodes, u8),
ByteConversionError(ByteConversionError),
CdsError(CdsError),
CustomEpochNotSupported,
}
impl From<CdsError> for TimestampError {
fn from(v: CdsError) -> Self {
TimestampError::CdsError(v)
}
}
#[cfg(feature = "std")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "std")))]
#[derive(Debug, Clone)]
pub enum StdTimestampError {
SystemTimeError(SystemTimeError),
TimestampError(TimestampError),
}
#[cfg(feature = "std")]
impl From<TimestampError> for StdTimestampError {
fn from(v: TimestampError) -> Self {
Self::TimestampError(v)
}
}
#[cfg(feature = "std")]
impl From<SystemTimeError> for StdTimestampError {
fn from(v: SystemTimeError) -> Self {
Self::SystemTimeError(v)
}
}
impl Display for TimestampError {
fn fmt(&self, f: &mut Formatter<'_>) -> core::fmt::Result {
match self {
TimestampError::InvalidTimeCode(time_code, raw_val) => {
write!(
f,
"invalid raw time code value {} for time code {:?}",
raw_val, time_code
)
}
TimestampError::CdsError(e) => {
write!(f, "cds error {}", e)
}
TimestampError::ByteConversionError(e) => {
write!(f, "byte conversion error {}", e)
}
TimestampError::CustomEpochNotSupported => {
write!(f, "custom epochs are not supported")
}
}
}
}
#[cfg(feature = "std")]
impl Error for TimestampError {
fn source(&self) -> Option<&(dyn Error + 'static)> {
match self {
TimestampError::ByteConversionError(e) => Some(e),
TimestampError::CdsError(e) => Some(e),
_ => None,
}
}
}
#[cfg(feature = "std")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "std")))]
pub fn seconds_since_epoch() -> f64 {
SystemTime::now()
.duration_since(SystemTime::UNIX_EPOCH)
.expect("System time generation failed")
.as_secs_f64()
}
/// Convert UNIX days to CCSDS days
///
/// - CCSDS epoch: 1958 January 1
/// - UNIX Epoch: 1970 January 1
pub const fn unix_to_ccsds_days(unix_days: i64) -> i64 {
unix_days - DAYS_CCSDS_TO_UNIX as i64
}
/// Convert CCSDS days to UNIX days
///
/// - CCSDS epoch: 1958 January 1
/// - UNIX Epoch: 1970 January 1
pub const fn ccsds_to_unix_days(ccsds_days: i64) -> i64 {
ccsds_days + DAYS_CCSDS_TO_UNIX as i64
}
#[cfg(feature = "std")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "std")))]
pub fn ms_of_day_using_sysclock() -> u32 {
ms_of_day(seconds_since_epoch())
}
pub fn ms_of_day(seconds_since_epoch: f64) -> u32 {
let fraction_ms = seconds_since_epoch - seconds_since_epoch.floor();
let ms_of_day: u32 = (((seconds_since_epoch.floor() as u32 % SECONDS_PER_DAY) * 1000) as f64
+ fraction_ms)
.floor() as u32;
ms_of_day
}
pub trait TimeWriter {
/// Generic function to convert write a timestamp into a raw buffer.
/// Returns the number of written bytes on success.
fn write_to_bytes(&self, bytes: &mut [u8]) -> Result<usize, TimestampError>;
}
pub trait TimeReader {
fn from_bytes(buf: &[u8]) -> Result<Self, TimestampError>
where
Self: Sized;
}
/// Trait for generic CCSDS time providers.
pub trait CcsdsTimeProvider {
fn len_as_bytes(&self) -> usize;
/// Returns the pfield of the time provider. The pfield can have one or two bytes depending
/// on the extension bit (first bit). The time provider should returns a tuple where the first
/// entry denotes the length of the pfield and the second entry is the value of the pfield
/// in big endian format.
fn p_field(&self) -> (usize, [u8; 2]);
fn ccdsd_time_code(&self) -> CcsdsTimeCodes;
fn unix_seconds(&self) -> i64;
fn date_time(&self) -> Option<DateTime<Utc>>;
}
/// Module to generate or read CDS timestamps as specified in
/// [CCSDS 301.0-B-4](https://public.ccsds.org/Pubs/301x0b4e1.pdf) section 3.3 .
///
/// The core data structure to do this is the [cds::TimeProvider] struct.
pub mod cds {
use super::*;
use crate::private::Sealed;
use core::fmt::Debug;
const CDS_SHORT_P_FIELD: u8 = (CcsdsTimeCodes::Cds as u8) << 4;
pub const MIN_CDS_FIELD_LEN: usize = 7;
/// Generic trait implemented by token structs to specify the length of day field at type
/// level. This trait is only meant to be implemented in this crate and therefore sealed.
pub trait ProvidesDaysLength: Sealed {
type FieldType: Copy + Clone + TryFrom<i32>;
}
/// Type level token to be used as a generic parameter to [TimeProvider].
#[derive(Debug, PartialEq, Eq, Default)]
pub struct DaysLen16Bits {}
impl Sealed for DaysLen16Bits {}
impl ProvidesDaysLength for DaysLen16Bits {
type FieldType = u16;
}
/// Type level token to be used as a generic parameter to [TimeProvider].
#[derive(Debug, PartialEq, Eq, Default)]
pub struct DaysLen24Bits {}
impl Sealed for DaysLen24Bits {}
impl ProvidesDaysLength for DaysLen24Bits {
type FieldType = u32;
}
#[derive(Debug, PartialEq, Eq, Copy, Clone)]
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
pub enum LengthOfDaySegment {
Short16Bits = 0,
Long24Bits = 1,
}
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
pub enum SubmillisPrecision {
Absent,
Microseconds(u16),
Picoseconds(u32),
Reserved,
}
pub fn length_of_day_segment_from_pfield(pfield: u8) -> LengthOfDaySegment {
if (pfield >> 2) & 0b1 == 1 {
return LengthOfDaySegment::Long24Bits;
}
LengthOfDaySegment::Short16Bits
}
pub fn precision_from_pfield(pfield: u8) -> SubmillisPrecision {
match pfield & 0b11 {
0b01 => SubmillisPrecision::Microseconds(0),
0b10 => SubmillisPrecision::Picoseconds(0),
0b00 => SubmillisPrecision::Absent,
0b11 => SubmillisPrecision::Reserved,
_ => panic!("pfield to SubmillisPrecision failed"),
}
}
/// This object is the abstraction for the CCSDS Day Segmented Time Code (CDS).
///
/// It has the capability to generate and read timestamps as specified in the CCSDS 301.0-B-4
/// section 3.3 . The width of the days field is configured at compile time via the generic
/// [ProvidesDaysLength] trait which is implemented by [DaysLen16Bits] and [DaysLen24Bits].
///
/// Custom epochs are not supported yet.
/// Furthermore, the preamble field (p-field) is explicitly conveyed.
/// That means it will always be present when writing the time stamp to a raw buffer, and it
/// must be present when reading a CDS timestamp from a raw buffer.
///
/// # Example
///
/// ```
/// use spacepackets::time::cds::{TimeProvider, DaysLen16Bits};
/// use spacepackets::time::{TimeWriter, CcsdsTimeCodes, TimeReader, CcsdsTimeProvider};
///
/// let timestamp_now = TimeProvider::from_now_with_u16_days().unwrap();
/// let mut raw_stamp = [0; 7];
/// {
/// let written = timestamp_now.write_to_bytes(&mut raw_stamp).unwrap();
/// assert_eq!((raw_stamp[0] >> 4) & 0b111, CcsdsTimeCodes::Cds as u8);
/// assert_eq!(written, 7);
/// }
/// {
/// let read_result = TimeProvider::<DaysLen16Bits>::from_bytes(&raw_stamp);
/// assert!(read_result.is_ok());
/// let stamp_deserialized = read_result.unwrap();
/// assert_eq!(stamp_deserialized.len_as_bytes(), 7);
/// }
/// ```
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
pub struct TimeProvider<DaysLen: ProvidesDaysLength = DaysLen16Bits> {
pfield: u8,
ccsds_days: DaysLen::FieldType,
ms_of_day: u32,
submillis_precision: Option<SubmillisPrecision>,
unix_seconds: i64,
}
#[cfg(feature = "std")]
struct ConversionFromNow {
ccsds_days: i32,
ms_of_day: u64,
unix_days_seconds: u64,
submillis_prec: Option<SubmillisPrecision>,
}
#[cfg(feature = "std")]
impl ConversionFromNow {
fn new() -> Result<Self, SystemTimeError> {
Self::new_generic(None)
}
fn new_with_submillis_us_prec() -> Result<Self, SystemTimeError> {
Self::new_generic(Some(SubmillisPrecision::Microseconds(0)))
}
fn new_with_submillis_ps_prec() -> Result<Self, SystemTimeError> {
Self::new_generic(Some(SubmillisPrecision::Picoseconds(0)))
}
fn new_generic(mut prec: Option<SubmillisPrecision>) -> Result<Self, SystemTimeError> {
let now = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH)?;
let epoch = now.as_secs();
let secs_of_day = epoch % SECONDS_PER_DAY as u64;
let unix_days_seconds = epoch - secs_of_day;
if let Some(submilli_prec) = prec {
match submilli_prec {
SubmillisPrecision::Microseconds(_) => {
prec = Some(SubmillisPrecision::Microseconds(
(now.subsec_micros() % 1000) as u16,
));
}
SubmillisPrecision::Picoseconds(_) => {
prec = Some(SubmillisPrecision::Picoseconds(
(now.subsec_nanos() * 1000) as u32,
));
}
_ => (),
}
}
Ok(Self {
ms_of_day: secs_of_day * 1000 + now.subsec_millis() as u64,
ccsds_days: unix_to_ccsds_days((unix_days_seconds / SECONDS_PER_DAY as u64) as i64)
as i32,
unix_days_seconds,
submillis_prec: prec,
})
}
}
impl<ProvidesDaysLen: ProvidesDaysLength> TimeProvider<ProvidesDaysLen> {
pub fn set_submillis_precision(&mut self, prec: SubmillisPrecision) {
self.pfield &= !(0b11);
if let SubmillisPrecision::Absent = prec {
self.submillis_precision = None;
return;
}
self.submillis_precision = Some(prec);
match prec {
SubmillisPrecision::Microseconds(_) => {
self.pfield |= 0b01;
}
SubmillisPrecision::Picoseconds(_) => {
self.pfield |= 0b10;
}
_ => (),
}
}
pub fn clear_submillis_precision(&mut self) {
self.pfield &= !(0b11);
self.submillis_precision = None;
}
pub fn ccsds_days(&self) -> ProvidesDaysLen::FieldType {
self.ccsds_days
}
pub fn submillis_precision(&self) -> Option<SubmillisPrecision> {
self.submillis_precision
}
pub fn ms_of_day(&self) -> u32 {
self.ms_of_day
}
fn generic_raw_read_checks(
buf: &[u8],
days_len: LengthOfDaySegment,
) -> Result<SubmillisPrecision, TimestampError> {
if buf.len() < MIN_CDS_FIELD_LEN {
return Err(TimestampError::ByteConversionError(
ByteConversionError::FromSliceTooSmall(SizeMissmatch {
expected: MIN_CDS_FIELD_LEN,
found: buf.len(),
}),
));
}
let pfield = buf[0];
match CcsdsTimeCodes::try_from(pfield >> 4 & 0b111) {
Ok(cds_type) => match cds_type {
CcsdsTimeCodes::Cds => (),
_ => {
return Err(TimestampError::InvalidTimeCode(
CcsdsTimeCodes::Cds,
cds_type as u8,
))
}
},
_ => {
return Err(TimestampError::InvalidTimeCode(
CcsdsTimeCodes::Cds,
pfield >> 4 & 0b111,
))
}
};
if ((pfield >> 3) & 0b1) == 1 {
return Err(TimestampError::CustomEpochNotSupported);
}
let days_len_from_pfield = length_of_day_segment_from_pfield(pfield);
if days_len_from_pfield != days_len {
return Err(
CdsError::InvalidCtorForDaysOfLenInPreamble(days_len_from_pfield).into(),
);
}
let stamp_len = Self::calc_stamp_len(pfield);
if buf.len() < stamp_len {
return Err(TimestampError::ByteConversionError(
ByteConversionError::FromSliceTooSmall(SizeMissmatch {
expected: stamp_len,
found: buf.len(),
}),
));
}
Ok(precision_from_pfield(pfield))
}
fn calc_stamp_len(pfield: u8) -> usize {
let mut init_len = 7;
if length_of_day_segment_from_pfield(pfield) == LengthOfDaySegment::Long24Bits {
init_len += 1
}
match pfield & 0b11 {
0b01 => {
init_len += 2;
}
0b10 => {
init_len += 4;
}
_ => (),
}
init_len
}
fn setup(&mut self, unix_days_seconds: i64, ms_of_day: u64) {
self.calc_unix_seconds(unix_days_seconds, ms_of_day);
}
fn calc_unix_seconds(&mut self, unix_days_seconds: i64, ms_of_day: u64) {
self.unix_seconds = unix_days_seconds;
let seconds_of_day = (ms_of_day / 1000) as i64;
if self.unix_seconds < 0 {
self.unix_seconds -= seconds_of_day;
} else {
self.unix_seconds += seconds_of_day;
}
}
fn calc_date_time(&self, ms_since_last_second: u32) -> Option<DateTime<Utc>> {
assert!(ms_since_last_second < 1000, "Invalid MS since last second");
let ns_since_last_sec = ms_since_last_second * 1e6 as u32;
if let LocalResult::Single(val) =
Utc.timestamp_opt(self.unix_seconds, ns_since_last_sec)
{
return Some(val);
}
None
}
fn length_check(&self, buf: &[u8], len_as_bytes: usize) -> Result<(), TimestampError> {
if buf.len() < len_as_bytes {
return Err(TimestampError::ByteConversionError(
ByteConversionError::ToSliceTooSmall(SizeMissmatch {
expected: len_as_bytes,
found: buf.len(),
}),
));
}
Ok(())
}
fn generic_new(
days_len: LengthOfDaySegment,
ccsds_days: ProvidesDaysLen::FieldType,
ms_of_day: u32,
) -> Result<Self, CdsError>
where
i64: From<ProvidesDaysLen::FieldType>,
{
let mut provider = Self {
pfield: Self::generate_p_field(days_len, None),
ccsds_days,
ms_of_day,
unix_seconds: 0,
submillis_precision: None,
};
let unix_days_seconds = ccsds_to_unix_days(ccsds_days.into()) * SECONDS_PER_DAY as i64;
provider.setup(unix_days_seconds, ms_of_day.into());
Ok(provider)
}
#[cfg(feature = "std")]
fn generic_from_now(
days_len: LengthOfDaySegment,
conversion_from_now: ConversionFromNow,
) -> Result<Self, StdTimestampError>
where
<ProvidesDaysLen::FieldType as TryFrom<i32>>::Error: Debug,
{
let ccsds_days: ProvidesDaysLen::FieldType =
conversion_from_now.ccsds_days.try_into().map_err(|_| {
StdTimestampError::TimestampError(
CdsError::InvalidCcsdsDays(conversion_from_now.ccsds_days.into()).into(),
)
})?;
let mut provider = Self {
pfield: Self::generate_p_field(days_len, conversion_from_now.submillis_prec),
ccsds_days,
ms_of_day: conversion_from_now.ms_of_day as u32,
unix_seconds: 0,
submillis_precision: conversion_from_now.submillis_prec,
};
provider.setup(
conversion_from_now.unix_days_seconds as i64,
conversion_from_now.ms_of_day,
);
Ok(provider)
}
#[cfg(feature = "std")]
fn generic_conversion_from_now(&self) -> Result<ConversionFromNow, SystemTimeError> {
Ok(match self.submillis_precision {
None => ConversionFromNow::new()?,
Some(prec) => match prec {
SubmillisPrecision::Microseconds(_) => {
ConversionFromNow::new_with_submillis_us_prec()?
}
SubmillisPrecision::Picoseconds(_) => {
ConversionFromNow::new_with_submillis_ps_prec()?
}
_ => ConversionFromNow::new()?,
},
})
}
fn generate_p_field(
day_seg_len: LengthOfDaySegment,
submillis_prec: Option<SubmillisPrecision>,
) -> u8 {
let mut pfield = CDS_SHORT_P_FIELD | ((day_seg_len as u8) << 2);
if let Some(submillis_prec) = submillis_prec {
match submillis_prec {
SubmillisPrecision::Microseconds(_) => pfield |= 0b01,
SubmillisPrecision::Picoseconds(_) => pfield |= 0b10,
SubmillisPrecision::Reserved => pfield |= 0b11,
_ => (),
}
}
pfield
}
#[cfg(feature = "std")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "std")))]
pub fn update_from_now(&mut self) -> Result<(), StdTimestampError>
where
<ProvidesDaysLen::FieldType as TryFrom<i32>>::Error: Debug,
{
let conversion_from_now = self.generic_conversion_from_now()?;
let ccsds_days: ProvidesDaysLen::FieldType =
conversion_from_now.ccsds_days.try_into().map_err(|_| {
StdTimestampError::TimestampError(
CdsError::InvalidCcsdsDays(conversion_from_now.ccsds_days as i64).into(),
)
})?;
self.ccsds_days = ccsds_days;
self.ms_of_day = conversion_from_now.ms_of_day as u32;
self.setup(
conversion_from_now.unix_days_seconds as i64,
conversion_from_now.ms_of_day,
);
Ok(())
}
}
impl TimeProvider<DaysLen24Bits> {
/// Generate a new timestamp provider with the days field width set to 24 bits
pub fn new_with_u24_days(ccsds_days: u32, ms_of_day: u32) -> Result<Self, CdsError> {
if ccsds_days > 2_u32.pow(24) {
return Err(CdsError::InvalidCcsdsDays(ccsds_days.into()));
}
Self::generic_new(LengthOfDaySegment::Long24Bits, ccsds_days, ms_of_day)
}
/// Generate a time stamp from the current time using the system clock.
#[cfg(feature = "std")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "std")))]
pub fn from_now_with_u24_days() -> Result<Self, StdTimestampError> {
let conversion_from_now = ConversionFromNow::new()?;
Self::generic_from_now(LengthOfDaySegment::Long24Bits, conversion_from_now)
}
/// Like [Self::from_now_with_u24_days] but with microsecond sub-millisecond precision.
#[cfg(feature = "std")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "std")))]
pub fn from_now_with_u24_days_and_us_prec() -> Result<Self, StdTimestampError> {
let conversion_from_now = ConversionFromNow::new_with_submillis_us_prec()?;
Self::generic_from_now(LengthOfDaySegment::Long24Bits, conversion_from_now)
}
/// Like [Self::from_now_with_u24_days] but with picoseconds sub-millisecond precision.
#[cfg(feature = "std")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "std")))]
pub fn from_now_with_u24_days_ps_submillis_prec() -> Result<Self, StdTimestampError> {
let conversion_from_now = ConversionFromNow::new_with_submillis_ps_prec()?;
Self::generic_from_now(LengthOfDaySegment::Long24Bits, conversion_from_now)
}
fn from_bytes_24_bit_days(buf: &[u8]) -> Result<Self, TimestampError> {
let submillis_precision =
Self::generic_raw_read_checks(buf, LengthOfDaySegment::Long24Bits)?;
let mut temp_buf: [u8; 4] = [0; 4];
temp_buf[1..4].copy_from_slice(&buf[1..4]);
let cccsds_days: u32 = u32::from_be_bytes(temp_buf);
let ms_of_day: u32 = u32::from_be_bytes(buf[4..8].try_into().unwrap());
let mut provider = Self::new_with_u24_days(cccsds_days, ms_of_day)?;
match submillis_precision {
SubmillisPrecision::Microseconds(_) => {
provider.set_submillis_precision(SubmillisPrecision::Microseconds(
u16::from_be_bytes(buf[8..10].try_into().unwrap()),
))
}
SubmillisPrecision::Picoseconds(_) => {
provider.set_submillis_precision(SubmillisPrecision::Picoseconds(
u32::from_be_bytes(buf[8..12].try_into().unwrap()),
))
}
_ => (),
}
Ok(provider)
}
}
impl TimeProvider<DaysLen16Bits> {
/// Generate a new timestamp provider with the days field width set to 16 bits
pub fn new_with_u16_days(ccsds_days: u16, ms_of_day: u32) -> Self {
// This should never fail, type system ensures CCSDS can not be negative or too large
Self::generic_new(LengthOfDaySegment::Short16Bits, ccsds_days, ms_of_day).unwrap()
}
/// Generate a time stamp from the current time using the system clock.
#[cfg(feature = "std")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "std")))]
pub fn from_now_with_u16_days() -> Result<Self, StdTimestampError> {
let conversion_from_now = ConversionFromNow::new()?;
Self::generic_from_now(LengthOfDaySegment::Short16Bits, conversion_from_now)
}
/// Like [Self::from_now_with_u16_days] but with microsecond sub-millisecond precision.
#[cfg(feature = "std")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "std")))]
pub fn from_now_with_u16_days_and_us_prec() -> Result<Self, StdTimestampError> {
let conversion_from_now = ConversionFromNow::new_with_submillis_us_prec()?;
Self::generic_from_now(LengthOfDaySegment::Short16Bits, conversion_from_now)
}
/// Like [Self::from_now_with_u16_days] but with picosecond sub-millisecond precision.
#[cfg(feature = "std")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "std")))]
pub fn from_now_with_u16_days_and_ps_prec() -> Result<Self, StdTimestampError> {
let conversion_from_now = ConversionFromNow::new_with_submillis_ps_prec()?;
Self::generic_from_now(LengthOfDaySegment::Short16Bits, conversion_from_now)
}
fn from_bytes_16_bit_days(buf: &[u8]) -> Result<Self, TimestampError> {
let submillis_precision =
Self::generic_raw_read_checks(buf, LengthOfDaySegment::Short16Bits)?;
let ccsds_days: u16 = u16::from_be_bytes(buf[1..3].try_into().unwrap());
let ms_of_day: u32 = u32::from_be_bytes(buf[3..7].try_into().unwrap());
let mut provider = Self::new_with_u16_days(ccsds_days, ms_of_day);
provider.pfield = buf[0];
match submillis_precision {
SubmillisPrecision::Microseconds(_) => {
provider.set_submillis_precision(SubmillisPrecision::Microseconds(
u16::from_be_bytes(buf[7..9].try_into().unwrap()),
))
}
SubmillisPrecision::Picoseconds(_) => {
provider.set_submillis_precision(SubmillisPrecision::Picoseconds(
u32::from_be_bytes(buf[7..11].try_into().unwrap()),
))
}
_ => (),
}
Ok(provider)
}
}
impl<ProvidesDaysLen: ProvidesDaysLength> CcsdsTimeProvider for TimeProvider<ProvidesDaysLen> {
fn len_as_bytes(&self) -> usize {
Self::calc_stamp_len(self.pfield)
}
fn p_field(&self) -> (usize, [u8; 2]) {
(1, [self.pfield, 0])
}
fn ccdsd_time_code(&self) -> CcsdsTimeCodes {
CcsdsTimeCodes::Cds
}
fn unix_seconds(&self) -> i64 {
self.unix_seconds
}
fn date_time(&self) -> Option<DateTime<Utc>> {
self.calc_date_time(self.ms_of_day % 1000)
}
}
impl TimeReader for TimeProvider<DaysLen16Bits> {
fn from_bytes(buf: &[u8]) -> Result<Self, TimestampError> {
Self::from_bytes_16_bit_days(buf)
}
}
impl TimeReader for TimeProvider<DaysLen24Bits> {
fn from_bytes(buf: &[u8]) -> Result<Self, TimestampError> {
Self::from_bytes_24_bit_days(buf)
}
}
impl TimeWriter for TimeProvider<DaysLen16Bits> {
fn write_to_bytes(&self, buf: &mut [u8]) -> Result<usize, TimestampError> {
self.length_check(buf, self.len_as_bytes())?;
buf[0] = self.pfield;
buf[1..3].copy_from_slice(self.ccsds_days.to_be_bytes().as_slice());
buf[3..7].copy_from_slice(self.ms_of_day.to_be_bytes().as_slice());
if let Some(submillis_prec) = self.submillis_precision {
match submillis_prec {
SubmillisPrecision::Microseconds(ms) => {
buf[7..9].copy_from_slice(ms.to_be_bytes().as_slice());
}
SubmillisPrecision::Picoseconds(ps) => {
buf[7..11].copy_from_slice(ps.to_be_bytes().as_slice());
}
_ => (),
}
}
Ok(self.len_as_bytes())
}
}
impl TimeWriter for TimeProvider<DaysLen24Bits> {
fn write_to_bytes(&self, buf: &mut [u8]) -> Result<usize, TimestampError> {
self.length_check(buf, self.len_as_bytes())?;
buf[0] = self.pfield;
let be_days = self.ccsds_days.to_be_bytes();
buf[1..4].copy_from_slice(&be_days[1..4]);
buf[4..8].copy_from_slice(self.ms_of_day.to_be_bytes().as_slice());
if let Some(submillis_prec) = self.submillis_precision {
match submillis_prec {
SubmillisPrecision::Microseconds(ms) => {
buf[8..10].copy_from_slice(ms.to_be_bytes().as_slice());
}
SubmillisPrecision::Picoseconds(ps) => {
buf[8..12].copy_from_slice(ps.to_be_bytes().as_slice());
}
_ => (),
}
}
Ok(self.len_as_bytes())
}
}
}
/// Module to generate the ASCII timecodes specified in
/// [CCSDS 301.0-B-4](https://public.ccsds.org/Pubs/301x0b4e1.pdf) section 3.5 .
/// See [chrono::DateTime::format] for a usage example of the generated
/// [chrono::format::DelayedFormat] structs.
pub mod ascii {
#[cfg(feature = "alloc")]
use chrono::format::{DelayedFormat, StrftimeItems};
use chrono::{DateTime, Utc};
/// Tuple of format string and formatted size for time code A.
///
/// Format: YYYY-MM-DDThh:mm:ss.ddd
///
/// Three digits are used for the decimal fraction
pub const FMT_STR_CODE_A_WITH_SIZE: (&str, usize) = ("%FT%T%.3f", 23);
/// Tuple of format string and formatted size for time code A.
///
/// Format: YYYY-MM-DDThh:mm:ss.dddZ
///
/// Three digits are used for the decimal fraction and a terminator is added at the end.
pub const FMT_STR_CODE_A_TERMINATED_WITH_SIZE: (&str, usize) = ("%FT%T%.3fZ", 24);
/// Tuple of format string and formatted size for time code A.
///
/// Format: YYYY-DDDThh:mm:ss.ddd
///
/// Three digits are used for the decimal fraction
pub const FMT_STR_CODE_B_WITH_SIZE: (&str, usize) = ("%Y-%jT%T%.3f", 21);
/// Tuple of format string and formatted size for time code A.
///
/// Format: YYYY-DDDThh:mm:ss.dddZ
///
/// Three digits are used for the decimal fraction and a terminator is added at the end.
pub const FMT_STR_CODE_B_TERMINATED_WITH_SIZE: (&str, usize) = ("%Y-%jT%T%.3fZ", 22);
/// Generates a time code formatter using the [FMT_STR_CODE_A_WITH_SIZE] format.
#[cfg(feature = "alloc")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "alloc")))]
pub fn generate_time_code_a(date: &DateTime<Utc>) -> DelayedFormat<StrftimeItems<'static>> {
date.format(FMT_STR_CODE_A_WITH_SIZE.0)
}
/// Generates a time code formatter using the [FMT_STR_CODE_A_TERMINATED_WITH_SIZE] format.
#[cfg(feature = "alloc")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "alloc")))]
pub fn generate_time_code_a_terminated(
date: &DateTime<Utc>,
) -> DelayedFormat<StrftimeItems<'static>> {
date.format(FMT_STR_CODE_A_TERMINATED_WITH_SIZE.0)
}
/// Generates a time code formatter using the [FMT_STR_CODE_B_WITH_SIZE] format.
#[cfg(feature = "alloc")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "alloc")))]
pub fn generate_time_code_b(date: &DateTime<Utc>) -> DelayedFormat<StrftimeItems<'static>> {
date.format(FMT_STR_CODE_B_WITH_SIZE.0)
}
/// Generates a time code formatter using the [FMT_STR_CODE_B_TERMINATED_WITH_SIZE] format.
#[cfg(feature = "alloc")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "alloc")))]
pub fn generate_time_code_b_terminated(
date: &DateTime<Utc>,
) -> DelayedFormat<StrftimeItems<'static>> {
date.format(FMT_STR_CODE_B_TERMINATED_WITH_SIZE.0)
}
}
#[cfg(all(test, feature = "std"))]
mod tests {
use super::cds::TimeProvider;
use super::*;
use crate::time::cds::{DaysLen16Bits, DaysLen24Bits, SubmillisPrecision};
use crate::time::TimestampError::{ByteConversionError, InvalidTimeCode};
use crate::ByteConversionError::{FromSliceTooSmall, ToSliceTooSmall};
use alloc::format;
use chrono::{Datelike, Timelike};
#[cfg(feature = "serde")]
use postcard::{from_bytes, to_allocvec};
#[test]
fn test_ascii_timestamp_a_unterminated() {
let date = Utc::now();
let stamp_formatter = ascii::generate_time_code_a(&date);
let stamp = format!("{}", stamp_formatter);
let t_sep = stamp.find("T");
assert!(t_sep.is_some());
assert_eq!(t_sep.unwrap(), 10);
assert_eq!(stamp.len(), ascii::FMT_STR_CODE_A_WITH_SIZE.1);
}
#[test]
fn test_ascii_timestamp_a_terminated() {
let date = Utc::now();
let stamp_formatter = ascii::generate_time_code_a_terminated(&date);
let stamp = format!("{}", stamp_formatter);
let t_sep = stamp.find("T");
assert!(t_sep.is_some());
assert_eq!(t_sep.unwrap(), 10);
let z_terminator = stamp.find("Z");
assert!(z_terminator.is_some());
assert_eq!(
z_terminator.unwrap(),
ascii::FMT_STR_CODE_A_TERMINATED_WITH_SIZE.1 - 1
);
assert_eq!(stamp.len(), ascii::FMT_STR_CODE_A_TERMINATED_WITH_SIZE.1);
}
#[test]
fn test_ascii_timestamp_b_unterminated() {
let date = Utc::now();
let stamp_formatter = ascii::generate_time_code_b(&date);
let stamp = format!("{}", stamp_formatter);
let t_sep = stamp.find("T");
assert!(t_sep.is_some());
assert_eq!(t_sep.unwrap(), 8);
assert_eq!(stamp.len(), ascii::FMT_STR_CODE_B_WITH_SIZE.1);
}
#[test]
fn test_ascii_timestamp_b_terminated() {
let date = Utc::now();
let stamp_formatter = ascii::generate_time_code_b_terminated(&date);
let stamp = format!("{}", stamp_formatter);
let t_sep = stamp.find("T");
assert!(t_sep.is_some());
assert_eq!(t_sep.unwrap(), 8);
let z_terminator = stamp.find("Z");
assert!(z_terminator.is_some());
assert_eq!(
z_terminator.unwrap(),
ascii::FMT_STR_CODE_B_TERMINATED_WITH_SIZE.1 - 1
);
assert_eq!(stamp.len(), ascii::FMT_STR_CODE_B_TERMINATED_WITH_SIZE.1);
}
#[test]
fn test_days_conversion() {
assert_eq!(unix_to_ccsds_days(DAYS_CCSDS_TO_UNIX.into()), 0);
assert_eq!(ccsds_to_unix_days(0), DAYS_CCSDS_TO_UNIX.into());
}
#[test]
fn test_get_current_time() {
let sec_floats = seconds_since_epoch();
assert!(sec_floats > 0.0);
}
#[test]
fn test_time_stamp_zero_args() {
let time_stamper = TimeProvider::new_with_u16_days(0, 0);
assert_eq!(
time_stamper.unix_seconds(),
(DAYS_CCSDS_TO_UNIX * SECONDS_PER_DAY as i32) as i64
);
assert_eq!(time_stamper.submillis_precision(), None);
assert_eq!(time_stamper.ccdsd_time_code(), CcsdsTimeCodes::Cds);
assert_eq!(
time_stamper.p_field(),
(1, [(CcsdsTimeCodes::Cds as u8) << 4, 0])
);
let date_time = time_stamper.date_time().unwrap();
assert_eq!(date_time.year(), 1958);
assert_eq!(date_time.month(), 1);
assert_eq!(date_time.day(), 1);
assert_eq!(date_time.hour(), 0);
assert_eq!(date_time.minute(), 0);
assert_eq!(date_time.second(), 0);
}
#[test]
fn test_time_stamp_unix_epoch() {
let time_stamper = TimeProvider::new_with_u16_days((-DAYS_CCSDS_TO_UNIX) as u16, 0);
assert_eq!(time_stamper.unix_seconds(), 0);
assert_eq!(time_stamper.submillis_precision(), None);
let date_time = time_stamper.date_time().unwrap();
assert_eq!(date_time.year(), 1970);
assert_eq!(date_time.month(), 1);
assert_eq!(date_time.day(), 1);
assert_eq!(date_time.hour(), 0);
assert_eq!(date_time.minute(), 0);
assert_eq!(date_time.second(), 0);
}
#[test]
fn test_large_days_field_write() {
let time_stamper = TimeProvider::new_with_u24_days(0x108020, 0);
assert!(time_stamper.is_ok());
let time_stamper = time_stamper.unwrap();
assert_eq!(time_stamper.len_as_bytes(), 8);
let mut buf = [0; 16];
let written = time_stamper.write_to_bytes(&mut buf);
assert!(written.is_ok());
let written = written.unwrap();
assert_eq!(written, 8);
assert_eq!(buf[1], 0x10);
assert_eq!(buf[2], 0x80);
assert_eq!(buf[3], 0x20);
let ms = u32::from_be_bytes(buf[4..8].try_into().unwrap());
assert_eq!(ms, 0);
assert_eq!((buf[0] >> 2) & 0b1, 1);
}
#[test]
fn test_large_days_field_read() {
let time_stamper = TimeProvider::new_with_u24_days(0x108020, 0);
assert!(time_stamper.is_ok());
let time_stamper = time_stamper.unwrap();
let mut buf = [0; 16];
let written = time_stamper.write_to_bytes(&mut buf);
assert!(written.is_ok());
let provider = TimeProvider::<DaysLen24Bits>::from_bytes(&buf);
assert!(provider.is_ok());
let provider = provider.unwrap();
assert_eq!(provider.ccsds_days(), 0x108020);
assert_eq!(provider.ms_of_day(), 0);
}
#[test]
fn test_large_days_field_read_invalid_ctor() {
let time_stamper = TimeProvider::new_with_u24_days(0x108020, 0);
assert!(time_stamper.is_ok());
let time_stamper = time_stamper.unwrap();
let mut buf = [0; 16];
let written = time_stamper.write_to_bytes(&mut buf);
assert!(written.is_ok());
let faulty_ctor = TimeProvider::<DaysLen16Bits>::from_bytes(&buf);
assert!(faulty_ctor.is_err());
let error = faulty_ctor.unwrap_err();
if let TimestampError::CdsError(CdsError::InvalidCtorForDaysOfLenInPreamble(len_of_day)) =
error
{
assert_eq!(len_of_day, LengthOfDaySegment::Long24Bits);
} else {
panic!("Wrong error type");
}
}
#[test]
fn test_write() {
let mut buf = [0; 16];
let time_stamper_0 = TimeProvider::new_with_u16_days(0, 0);
let mut res = time_stamper_0.write_to_bytes(&mut buf);
assert!(res.is_ok());
assert_eq!(buf[0], (CcsdsTimeCodes::Cds as u8) << 4);
assert_eq!(
u16::from_be_bytes(buf[1..3].try_into().expect("Byte conversion failed")),
0
);
assert_eq!(
u32::from_be_bytes(buf[3..7].try_into().expect("Byte conversion failed")),
0
);
let time_stamper_1 = TimeProvider::new_with_u16_days(u16::MAX - 1, u32::MAX - 1);
res = time_stamper_1.write_to_bytes(&mut buf);
assert!(res.is_ok());
assert_eq!(buf[0], (CcsdsTimeCodes::Cds as u8) << 4);
assert_eq!(
u16::from_be_bytes(buf[1..3].try_into().expect("Byte conversion failed")),
u16::MAX - 1
);
assert_eq!(
u32::from_be_bytes(buf[3..7].try_into().expect("Byte conversion failed")),
u32::MAX - 1
);
}
#[test]
fn test_faulty_write_buf_too_small() {
let mut buf = [0; 7];
let time_stamper = TimeProvider::new_with_u16_days(u16::MAX - 1, u32::MAX - 1);
for i in 0..6 {
let res = time_stamper.write_to_bytes(&mut buf[0..i]);
assert!(res.is_err());
match res.unwrap_err() {
ByteConversionError(ToSliceTooSmall(missmatch)) => {
assert_eq!(missmatch.found, i);
assert_eq!(missmatch.expected, 7);
}
_ => panic!(
"{}",
format!("Invalid error {:?} detected", res.unwrap_err())
),
}
}
}
#[test]
fn test_faulty_read_buf_too_small() {
let buf = [0; 7];
for i in 0..6 {
let res = TimeProvider::<DaysLen16Bits>::from_bytes(&buf[0..i]);
assert!(res.is_err());
let err = res.unwrap_err();
match err {
ByteConversionError(e) => match e {
FromSliceTooSmall(missmatch) => {
assert_eq!(missmatch.found, i);
assert_eq!(missmatch.expected, 7);
}
_ => panic!("{}", format!("Invalid error {:?} detected", e)),
},
_ => {
panic!("Unexpected error {:?}", err);
}
}
}
}
#[test]
fn test_faulty_invalid_pfield() {
let mut buf = [0; 16];
let time_stamper_0 = TimeProvider::new_with_u16_days(0, 0);
let res = time_stamper_0.write_to_bytes(&mut buf);
assert!(res.is_ok());
buf[0] = 0;
let res = TimeProvider::<DaysLen16Bits>::from_bytes(&buf);
assert!(res.is_err());
let err = res.unwrap_err();
match err {
InvalidTimeCode(code, raw) => {
assert_eq!(code, CcsdsTimeCodes::Cds);
assert_eq!(raw, 0);
}
_ => {}
}
}
#[test]
fn test_reading() {
let mut buf = [0; 16];
let time_stamper = TimeProvider::new_with_u16_days(u16::MAX - 1, u32::MAX - 1);
let res = time_stamper.write_to_bytes(&mut buf);
assert!(res.is_ok());
assert_eq!(buf[0], (CcsdsTimeCodes::Cds as u8) << 4);
assert_eq!(
u16::from_be_bytes(buf[1..3].try_into().expect("Byte conversion failed")),
u16::MAX - 1
);
assert_eq!(
u32::from_be_bytes(buf[3..7].try_into().expect("Byte conversion failed")),
u32::MAX - 1
);
let read_stamp: TimeProvider<DaysLen16Bits> =
TimeProvider::from_bytes(&buf).expect("Reading timestamp failed");
assert_eq!(read_stamp.ccsds_days(), u16::MAX - 1);
assert_eq!(read_stamp.ms_of_day(), u32::MAX - 1);
}
#[test]
fn test_time_now() {
let timestamp_now = TimeProvider::from_now_with_u16_days().unwrap();
let compare_stamp = Utc::now();
let dt = timestamp_now.date_time().unwrap();
if compare_stamp.year() > dt.year() {
assert_eq!(compare_stamp.year() - dt.year(), 1);
} else {
assert_eq!(dt.year(), compare_stamp.year());
}
generic_dt_property_equality_check(dt.month(), compare_stamp.month(), 1, 12);
assert_eq!(dt.day(), compare_stamp.day());
if compare_stamp.day() < dt.day() {
assert!(dt.day() >= 28);
assert_eq!(compare_stamp.day(), 1);
} else if compare_stamp.day() > dt.day() {
assert_eq!(compare_stamp.day() - dt.day(), 1);
} else {
assert_eq!(compare_stamp.day(), dt.day());
}
generic_dt_property_equality_check(dt.hour(), compare_stamp.hour(), 0, 23);
generic_dt_property_equality_check(dt.minute(), compare_stamp.minute(), 0, 59);
}
#[test]
fn test_submillis_precision_micros() {
let mut time_stamper = TimeProvider::new_with_u16_days(0, 0);
time_stamper.set_submillis_precision(SubmillisPrecision::Microseconds(500));
assert!(time_stamper.submillis_precision().is_some());
if let SubmillisPrecision::Microseconds(micros) =
time_stamper.submillis_precision().unwrap()
{
assert_eq!(micros, 500);
} else {
panic!("Submillis precision was not set properly");
}
let mut write_buf: [u8; 16] = [0; 16];
let written = time_stamper
.write_to_bytes(&mut write_buf)
.expect("Writing timestamp failed");
assert_eq!(written, 9);
let cross_check: u16 = 500;
assert_eq!(write_buf[7..9], cross_check.to_be_bytes());
}
#[test]
fn test_submillis_precision_picos() {
let mut time_stamper = TimeProvider::new_with_u16_days(0, 0);
time_stamper.set_submillis_precision(SubmillisPrecision::Picoseconds(5e8 as u32));
assert!(time_stamper.submillis_precision().is_some());
if let SubmillisPrecision::Picoseconds(ps) = time_stamper.submillis_precision().unwrap() {
assert_eq!(ps, 5e8 as u32);
} else {
panic!("Submillis precision was not set properly");
}
let mut write_buf: [u8; 16] = [0; 16];
let written = time_stamper
.write_to_bytes(&mut write_buf)
.expect("Writing timestamp failed");
assert_eq!(written, 11);
let cross_check: u32 = 5e8 as u32;
assert_eq!(write_buf[7..11], cross_check.to_be_bytes());
}
#[test]
fn read_stamp_with_ps_submillis_precision() {
let mut time_stamper = TimeProvider::new_with_u16_days(0, 0);
time_stamper.set_submillis_precision(SubmillisPrecision::Picoseconds(5e8 as u32));
let mut write_buf: [u8; 16] = [0; 16];
let written = time_stamper
.write_to_bytes(&mut write_buf)
.expect("Writing timestamp failed");
assert_eq!(written, 11);
let stamp_deserialized = TimeProvider::<DaysLen16Bits>::from_bytes(&write_buf);
assert!(stamp_deserialized.is_ok());
let stamp_deserialized = stamp_deserialized.unwrap();
assert_eq!(stamp_deserialized.len_as_bytes(), 11);
assert!(stamp_deserialized.submillis_precision().is_some());
let submillis_rec = stamp_deserialized.submillis_precision().unwrap();
if let SubmillisPrecision::Picoseconds(ps) = submillis_rec {
assert_eq!(ps, 5e8 as u32);
} else {
panic!("Wrong precision field detected");
}
}
#[test]
fn read_stamp_with_us_submillis_precision() {
let mut time_stamper = TimeProvider::new_with_u16_days(0, 0);
time_stamper.set_submillis_precision(SubmillisPrecision::Microseconds(500));
let mut write_buf: [u8; 16] = [0; 16];
let written = time_stamper
.write_to_bytes(&mut write_buf)
.expect("Writing timestamp failed");
assert_eq!(written, 9);
let stamp_deserialized = TimeProvider::<DaysLen16Bits>::from_bytes(&write_buf);
assert!(stamp_deserialized.is_ok());
let stamp_deserialized = stamp_deserialized.unwrap();
assert_eq!(stamp_deserialized.len_as_bytes(), 9);
assert!(stamp_deserialized.submillis_precision().is_some());
let submillis_rec = stamp_deserialized.submillis_precision().unwrap();
if let SubmillisPrecision::Microseconds(us) = submillis_rec {
assert_eq!(us, 500);
} else {
panic!("Wrong precision field detected");
}
}
#[test]
#[cfg(feature = "serde")]
fn test_serialization() {
let stamp_now = TimeProvider::from_now_with_u16_days().expect("Error retrieving time");
let val = to_allocvec(&stamp_now).expect("Serializing timestamp failed");
assert!(val.len() > 0);
let stamp_deser: TimeProvider = from_bytes(&val).expect("Stamp deserialization failed");
assert_eq!(stamp_deser, stamp_now);
}
fn generic_dt_property_equality_check(first: u32, second: u32, start: u32, end: u32) {
if second < first {
assert_eq!(second, start);
assert_eq!(first, end);
} else if second > first {
assert_eq!(second - first, 1);
} else {
assert_eq!(first, second);
}
}
}
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