use const instead of struct field

CHANGELOG.md

@@ -8,6 +8,16 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 # [unreleased]
 
+## Added
+
+- `EcssEnumerationExt` trait which implements `Debug`, `Copy`, `Clone`,
+  `PartialEq` and `Eq` in addition to `EcssEnumeration`
+
+## Changed
+
+- `EcssEnumeration` trait: Rename `write_to_bytes`
+  to `write_to_be_bytes`
+
 # [v0.2.0] 13.09.2022
 
 ## Added

Cargo.toml

@@ -36,3 +36,7 @@ version = "1.0.1"
 default = ["std"]
 std = ["chrono/std", "chrono/clock", "alloc"]
 alloc = ["postcard/alloc"]
+
+[package.metadata.docs.rs]
+all-features = true
+rustdoc-args = ["--cfg", "doc_cfg"]

src/ecss.rs

@@ -1,6 +1,7 @@
 //! Common definitions and helpers required to create PUS TMTC packets according to
 //! [ECSS-E-ST-70-41C](https://ecss.nl/standard/ecss-e-st-70-41c-space-engineering-telemetry-and-telecommand-packet-utilization-15-april-2016/)
 use crate::{ByteConversionError, CcsdsPacket, SizeMissmatch};
+use core::fmt::Debug;
 use core::mem::size_of;
 use crc::{Crc, CRC_16_IBM_3740};
 use serde::{Deserialize, Serialize};
@@ -158,7 +159,7 @@ macro_rules! sp_header_impls {
 pub(crate) use ccsds_impl;
 pub(crate) use sp_header_impls;
 
-/// Generic trait for ECSS enumeration which consist of a PFC field denoting their length
+/// Generic trait for ECSS enumeration which consist of a PFC field denoting their bit length
 /// and an unsigned value. The trait makes no assumptions about the actual type of the unsigned
 /// value and only requires implementors to implement a function which writes the enumeration into
 /// a raw byte format.
@@ -168,10 +169,12 @@ pub trait EcssEnumeration {
     fn byte_width(&self) -> usize {
         (self.pfc() / 8) as usize
     }
-    fn write_to_bytes(&self, buf: &mut [u8]) -> Result<(), ByteConversionError>;
+    fn write_to_be_bytes(&self, buf: &mut [u8]) -> Result<(), ByteConversionError>;
 }
 
-trait ToBeBytes {
+pub trait EcssEnumerationExt: EcssEnumeration + Debug + Copy + Clone + PartialEq + Eq {}
+
+pub trait ToBeBytes {
     type ByteArray: AsRef<[u8]>;
     fn to_be_bytes(&self) -> Self::ByteArray;
 }
@@ -208,6 +211,7 @@ impl ToBeBytes for u64 {
     }
 }
 
+#[derive(Debug, Copy, Clone, Eq, PartialEq)]
 pub struct GenericEcssEnumWrapper<TYPE> {
     val: TYPE,
 }
@@ -227,7 +231,7 @@ impl<TYPE: ToBeBytes> EcssEnumeration for GenericEcssEnumWrapper<TYPE> {
         size_of::<TYPE>() as u8 * 8_u8
     }
 
-    fn write_to_bytes(&self, buf: &mut [u8]) -> Result<(), ByteConversionError> {
+    fn write_to_be_bytes(&self, buf: &mut [u8]) -> Result<(), ByteConversionError> {
         if buf.len() < self.byte_width() as usize {
             return Err(ByteConversionError::ToSliceTooSmall(SizeMissmatch {
                 found: buf.len(),
@@ -239,6 +243,11 @@ impl<TYPE: ToBeBytes> EcssEnumeration for GenericEcssEnumWrapper<TYPE> {
     }
 }
 
+impl<TYPE: Debug + Copy + Clone + PartialEq + Eq + ToBeBytes> EcssEnumerationExt
+    for GenericEcssEnumWrapper<TYPE>
+{
+}
+
 pub type EcssEnumU8 = GenericEcssEnumWrapper<u8>;
 pub type EcssEnumU16 = GenericEcssEnumWrapper<u16>;
 pub type EcssEnumU32 = GenericEcssEnumWrapper<u32>;
@@ -254,7 +263,7 @@ mod tests {
         let mut buf = [0, 0, 0];
         let my_enum = EcssEnumU8::new(1);
         my_enum
-            .write_to_bytes(&mut buf[1..2])
+            .write_to_be_bytes(&mut buf[1..2])
             .expect("To byte conversion of u8 failed");
         assert_eq!(buf[1], 1);
     }
@@ -264,7 +273,7 @@ mod tests {
         let mut buf = [0, 0, 0];
         let my_enum = EcssEnumU16::new(0x1f2f);
         my_enum
-            .write_to_bytes(&mut buf[1..3])
+            .write_to_be_bytes(&mut buf[1..3])
             .expect("To byte conversion of u8 failed");
         assert_eq!(buf[1], 0x1f);
         assert_eq!(buf[2], 0x2f);
@@ -274,7 +283,7 @@ mod tests {
     fn test_slice_u16_too_small() {
         let mut buf = [0];
         let my_enum = EcssEnumU16::new(0x1f2f);
-        let res = my_enum.write_to_bytes(&mut buf[0..1]);
+        let res = my_enum.write_to_be_bytes(&mut buf[0..1]);
         assert!(res.is_err());
         let error = res.unwrap_err();
         match error {
@@ -293,7 +302,7 @@ mod tests {
         let mut buf = [0, 0, 0, 0, 0];
         let my_enum = EcssEnumU32::new(0x1f2f3f4f);
         my_enum
-            .write_to_bytes(&mut buf[1..5])
+            .write_to_be_bytes(&mut buf[1..5])
             .expect("To byte conversion of u8 failed");
         assert_eq!(buf[1], 0x1f);
         assert_eq!(buf[2], 0x2f);
@@ -305,7 +314,7 @@ mod tests {
     fn test_slice_u32_too_small() {
         let mut buf = [0, 0, 0, 0, 0];
         let my_enum = EcssEnumU32::new(0x1f2f3f4f);
-        let res = my_enum.write_to_bytes(&mut buf[0..3]);
+        let res = my_enum.write_to_be_bytes(&mut buf[0..3]);
         assert!(res.is_err());
         let error = res.unwrap_err();
         match error {

src/lib.rs

@@ -65,11 +65,12 @@ pub struct SizeMissmatch {
     pub found: usize,
     pub expected: usize,
 }
+
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
 pub enum ByteConversionError {
-    /// The passed slice is too small. Returns the found and expected minimum size
+    /// The passed slice is too small. Returns the passed slice length and expected minimum size
     ToSliceTooSmall(SizeMissmatch),
-    /// The provider buffer it soo small. Returns the found and expected minimum size
+    /// The provider buffer is too small. Returns the passed slice length and expected minimum size
     FromSliceTooSmall(SizeMissmatch),
     /// The [zerocopy] library failed to write to bytes
     ZeroCopyToError,
@@ -136,7 +137,7 @@ impl PacketId {
             sec_header_flag,
             apid: 0,
         };
-        pid.set_apid(apid).then(|| pid)
+        pid.set_apid(apid).then_some(pid)
     }
 
     /// Set a new Application Process ID (APID). If the passed number is invalid, the APID will
@@ -182,7 +183,7 @@ impl PacketSequenceCtrl {
             seq_flags,
             seq_count: 0,
         };
-        psc.set_seq_count(seq_count).then(|| psc)
+        psc.set_seq_count(seq_count).then_some(psc)
     }
     pub fn raw(&self) -> u16 {
         ((self.seq_flags as u16) << 14) | self.seq_count

src/tc.rs

@@ -370,6 +370,7 @@ impl<'slice> PusTc<'slice> {
     }
 
     #[cfg(feature = "alloc")]
+    #[cfg_attr(doc_cfg, doc(cfg(feature = "alloc")))]
     pub fn append_to_vec(&self, vec: &mut Vec<u8>) -> Result<usize, PusError> {
         let sph_zc = crate::zc::SpHeader::from(self.sp_header);
         let mut appended_len = PUS_TC_MIN_LEN_WITHOUT_APP_DATA;

src/time.rs

@@ -1,6 +1,6 @@
 //! 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, TimeZone, Utc};
+use chrono::{DateTime, LocalResult, TimeZone, Utc};
 
 #[allow(unused_imports)]
 #[cfg(not(feature = "std"))]
@@ -23,6 +23,8 @@ pub enum CcsdsTimeCodes {
     Ccs = 0b101,
 }
 
+const CDS_SHORT_P_FIELD: u8 = (CcsdsTimeCodes::Cds as u8) << 4;
+
 impl TryFrom<u8> for CcsdsTimeCodes {
     type Error = ();
 
@@ -47,6 +49,7 @@ pub enum TimestampError {
 }
 
 #[cfg(feature = "std")]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "std")))]
 pub fn seconds_since_epoch() -> f64 {
     SystemTime::now()
         .duration_since(SystemTime::UNIX_EPOCH)
@@ -111,7 +114,6 @@ pub trait CcsdsTimeProvider {
 /// ```
 #[derive(Debug, Copy, Clone, Default)]
 pub struct CdsShortTimeProvider {
-    pfield: u8,
     ccsds_days: u16,
     ms_of_day: u32,
     unix_seconds: i64,
@@ -121,7 +123,6 @@ pub struct CdsShortTimeProvider {
 impl CdsShortTimeProvider {
     pub fn new(ccsds_days: u16, ms_of_day: u32) -> Self {
         let provider = Self {
-            pfield: (Cds as u8) << 4,
             ccsds_days,
             ms_of_day,
             unix_seconds: 0,
@@ -133,6 +134,7 @@ impl CdsShortTimeProvider {
     }
 
     #[cfg(feature = "std")]
+    #[cfg_attr(doc_cfg, doc(cfg(feature = "std")))]
     pub fn from_now() -> Result<Self, SystemTimeError> {
         let now = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH)?;
         let epoch = now.as_secs();
@@ -140,7 +142,6 @@ impl CdsShortTimeProvider {
         let unix_days_seconds = epoch - secs_of_day;
         let ms_of_day = secs_of_day * 1000 + now.subsec_millis() as u64;
         let provider = Self {
-            pfield: (Cds as u8) << 4,
             ccsds_days: unix_to_ccsds_days((unix_days_seconds / SECONDS_PER_DAY as u64) as i32)
                 as u16,
             ms_of_day: ms_of_day as u32,
@@ -151,6 +152,7 @@ impl CdsShortTimeProvider {
     }
 
     #[cfg(feature = "std")]
+    #[cfg_attr(doc_cfg, doc(cfg(feature = "std")))]
     pub fn update_from_now(&mut self) -> Result<(), SystemTimeError> {
         let now = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH)?;
         let epoch = now.as_secs();
@@ -168,6 +170,7 @@ impl CdsShortTimeProvider {
     }
 
     #[cfg(feature = "std")]
+    #[cfg_attr(doc_cfg, doc(cfg(feature = "std")))]
     pub fn ms_of_day_using_sysclock() -> u32 {
         Self::ms_of_day(seconds_since_epoch())
     }
@@ -193,7 +196,11 @@ impl CdsShortTimeProvider {
     fn calc_date_time(&mut self, ms_since_last_second: u32) {
         assert!(ms_since_last_second < 1000, "Invalid MS since last second");
         let ns_since_last_sec = ms_since_last_second * 1e6 as u32;
-        self.date_time = Some(Utc.timestamp(self.unix_seconds, ns_since_last_sec));
+        if let LocalResult::Single(val) = Utc.timestamp_opt(self.unix_seconds, ns_since_last_sec) {
+            self.date_time = Some(val);
+        } else {
+            self.date_time = None;
+        }
     }
 }
 
@@ -203,7 +210,7 @@ impl CcsdsTimeProvider for CdsShortTimeProvider {
     }
 
     fn p_field(&self) -> (usize, [u8; 2]) {
-        (1, [self.pfield, 0])
+        (1, [CDS_SHORT_P_FIELD, 0])
     }
 
     fn ccdsd_time_code(&self) -> CcsdsTimeCodes {
@@ -229,7 +236,7 @@ impl TimeWriter for CdsShortTimeProvider {
                 }),
             ));
         }
-        buf[0] = self.pfield;
+        buf[0] = CDS_SHORT_P_FIELD;
         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());
         Ok(())

src/tm.rs

@@ -352,6 +352,7 @@ impl<'slice> PusTm<'slice> {
 
     /// Append the raw PUS byte representation to a provided [alloc::vec::Vec]
     #[cfg(feature = "alloc")]
+    #[cfg_attr(doc_cfg, doc(cfg(feature = "alloc")))]
     pub fn append_to_vec(&self, vec: &mut Vec<u8>) -> Result<usize, PusError> {
         let sph_zc = crate::zc::SpHeader::from(self.sp_header);
         let mut appended_len =