dvb_si/tables/
eit.rs

1//! Event Information Table — ETSI EN 300 468 §5.2.4.
2//!
3//! EIT carries programme event metadata. Four variants distinguished by
4//! table_id:
5//! - `0x4E` — Present/Following for the actual TS
6//! - `0x4F` — Present/Following for another TS
7//! - `0x50..=0x5F` — Schedule sub-tables for the actual TS
8//! - `0x60..=0x6F` — Schedule sub-tables for another TS
9
10use crate::descriptors::DescriptorLoop;
11use crate::error::{Error, Result};
12use crate::tables::RunningStatus;
13use alloc::vec::Vec;
14use dvb_common::{Parse, Serialize};
15
16/// table_id for present/following on the actual TS.
17pub const TABLE_ID_PF_ACTUAL: u8 = 0x4E;
18/// table_id for present/following on other TSes.
19pub const TABLE_ID_PF_OTHER: u8 = 0x4F;
20/// First table_id in the schedule range for the actual TS.
21pub const TABLE_ID_SCHEDULE_ACTUAL_FIRST: u8 = 0x50;
22/// Last table_id in the schedule range for the actual TS (inclusive).
23pub const TABLE_ID_SCHEDULE_ACTUAL_LAST: u8 = 0x5F;
24/// First table_id in the schedule range for other TSes.
25pub const TABLE_ID_SCHEDULE_OTHER_FIRST: u8 = 0x60;
26/// Last table_id in the schedule range for other TSes (inclusive).
27pub const TABLE_ID_SCHEDULE_OTHER_LAST: u8 = 0x6F;
28/// Well-known PID on which EIT is carried.
29pub const PID: u16 = 0x0012;
30
31const MIN_HEADER_LEN: usize = 3;
32const EXTENSION_HEADER_LEN: usize = 5;
33/// Bytes after the extension header: transport_stream_id(2) + original_network_id(2) + segment_last_section_number(1)
34/// + last_table_id(1) = 6 bytes between the section header and the first event.
35const POST_EXTENSION_LEN: usize = 6;
36const CRC_LEN: usize = 4;
37const MIN_SECTION_LEN: usize = MIN_HEADER_LEN + EXTENSION_HEADER_LEN + POST_EXTENSION_LEN + CRC_LEN;
38const EVENT_HEADER_LEN: usize = 12;
39
40/// EIT variant distinguished by table_id range.
41#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord)]
42#[cfg_attr(feature = "serde", derive(serde::Serialize))]
43#[non_exhaustive]
44pub enum EitKind {
45    /// Present/Following, actual TS.
46    PresentFollowingActual,
47    /// Present/Following, other TS.
48    PresentFollowingOther,
49    /// Schedule, actual TS — table_id `0x50..=0x5F`.
50    ScheduleActual,
51    /// Schedule, other TS — table_id `0x60..=0x6F`.
52    ScheduleOther,
53}
54
55impl EitKind {
56    /// Classify a table_id byte into a kind, if recognised.
57    #[must_use]
58    pub fn from_table_id(table_id: u8) -> Option<Self> {
59        match table_id {
60            TABLE_ID_PF_ACTUAL => Some(Self::PresentFollowingActual),
61            TABLE_ID_PF_OTHER => Some(Self::PresentFollowingOther),
62            TABLE_ID_SCHEDULE_ACTUAL_FIRST..=TABLE_ID_SCHEDULE_ACTUAL_LAST => {
63                Some(Self::ScheduleActual)
64            }
65            TABLE_ID_SCHEDULE_OTHER_FIRST..=TABLE_ID_SCHEDULE_OTHER_LAST => {
66                Some(Self::ScheduleOther)
67            }
68            _ => None,
69        }
70    }
71}
72
73/// One event in the EIT.
74#[derive(Debug, Clone, PartialEq, Eq)]
75#[cfg_attr(feature = "serde", derive(serde::Serialize))]
76#[cfg_attr(feature = "yoke", derive(yoke::Yokeable))]
77pub struct EitEvent<'a> {
78    /// 16-bit event_id.
79    pub event_id: u16,
80    /// 40-bit start_time: 16-bit MJD followed by 24-bit BCD UTC (HHMMSS).
81    /// Private — use [`start_time`](Self::start_time) for decoded access.
82    pub(crate) start_time_raw: [u8; 5],
83    /// 24-bit BCD duration HHMMSS.
84    /// Private — use [`duration`](Self::duration) for decoded access.
85    pub(crate) duration_raw: [u8; 3],
86    /// 3-bit running_status (EN 300 468 Table 6).
87    pub running_status: RunningStatus,
88    /// free_CA_mode flag.
89    pub free_ca_mode: bool,
90    /// Descriptor loop for this event. Serializes as the typed descriptor
91    /// sequence; `.raw()` yields the wire bytes.
92    pub descriptors: DescriptorLoop<'a>,
93}
94
95/// Event Information Table.
96#[derive(Debug, Clone, PartialEq, Eq)]
97#[cfg_attr(feature = "serde", derive(serde::Serialize))]
98#[cfg_attr(feature = "yoke", derive(yoke::Yokeable))]
99pub struct EitSection<'a> {
100    /// Variant based on table_id.
101    pub kind: EitKind,
102    /// Raw table_id byte as parsed (for schedule sub-tables, identifies the slot).
103    pub table_id: u8,
104    /// service_id the events belong to (table_id_extension).
105    pub service_id: u16,
106    /// 5-bit version_number.
107    pub version_number: u8,
108    /// current_next_indicator bit.
109    pub current_next_indicator: bool,
110    /// section_number.
111    pub section_number: u8,
112    /// last_section_number.
113    pub last_section_number: u8,
114    /// transport_stream_id the events are carried on.
115    pub transport_stream_id: u16,
116    /// original_network_id.
117    pub original_network_id: u16,
118    /// segment_last_section_number.
119    pub segment_last_section_number: u8,
120    /// last_table_id (for schedule sub-table grouping).
121    pub last_table_id: u8,
122    /// Events in wire order.
123    pub events: Vec<EitEvent<'a>>,
124}
125
126impl<'a> Parse<'a> for EitSection<'a> {
127    type Error = crate::error::Error;
128    fn parse(bytes: &'a [u8]) -> Result<Self> {
129        let min_len = MIN_HEADER_LEN + EXTENSION_HEADER_LEN + POST_EXTENSION_LEN + CRC_LEN;
130        if bytes.len() < min_len {
131            return Err(Error::BufferTooShort {
132                need: min_len,
133                have: bytes.len(),
134                what: "EitSection",
135            });
136        }
137
138        let table_id = bytes[0];
139        let kind = EitKind::from_table_id(table_id).ok_or(Error::UnexpectedTableId {
140            table_id,
141            what: "EitSection",
142            expected: &[
143                TABLE_ID_PF_ACTUAL,
144                TABLE_ID_PF_OTHER,
145                TABLE_ID_SCHEDULE_ACTUAL_FIRST,
146                TABLE_ID_SCHEDULE_OTHER_FIRST,
147            ],
148        })?;
149
150        let section_length = ((bytes[1] & 0x0F) as u16) << 8 | bytes[2] as u16;
151        let total = super::check_section_length(
152            bytes.len(),
153            MIN_HEADER_LEN,
154            section_length as usize,
155            MIN_SECTION_LEN,
156        )?;
157
158        let service_id = u16::from_be_bytes([bytes[3], bytes[4]]);
159        let version_number = (bytes[5] >> 1) & 0x1F;
160        let current_next_indicator = (bytes[5] & 0x01) != 0;
161        let section_number = bytes[6];
162        let last_section_number = bytes[7];
163
164        let transport_stream_id = u16::from_be_bytes([bytes[8], bytes[9]]);
165        let original_network_id = u16::from_be_bytes([bytes[10], bytes[11]]);
166        let segment_last_section_number = bytes[12];
167        let last_table_id = bytes[13];
168
169        let events_start = MIN_HEADER_LEN + EXTENSION_HEADER_LEN + POST_EXTENSION_LEN;
170        let events_end = total - CRC_LEN;
171        let mut events = Vec::new();
172        let mut pos = events_start;
173        while pos + EVENT_HEADER_LEN <= events_end {
174            let event_id = u16::from_be_bytes([bytes[pos], bytes[pos + 1]]);
175            let start_time_raw = [
176                bytes[pos + 2],
177                bytes[pos + 3],
178                bytes[pos + 4],
179                bytes[pos + 5],
180                bytes[pos + 6],
181            ];
182            let duration_raw = [bytes[pos + 7], bytes[pos + 8], bytes[pos + 9]];
183            let status_and_len_hi = bytes[pos + 10];
184            let running_status = RunningStatus::from_u8((status_and_len_hi >> 5) & 0x07);
185            let free_ca_mode = (status_and_len_hi & 0x10) != 0;
186            let descriptors_loop_length =
187                (((status_and_len_hi & 0x0F) as usize) << 8) | bytes[pos + 11] as usize;
188            let desc_start = pos + EVENT_HEADER_LEN;
189            let desc_end = desc_start + descriptors_loop_length;
190            if desc_end > events_end {
191                return Err(Error::SectionLengthOverflow {
192                    declared: descriptors_loop_length,
193                    available: events_end.saturating_sub(desc_start),
194                });
195            }
196            events.push(EitEvent {
197                event_id,
198                start_time_raw,
199                duration_raw,
200                running_status,
201                free_ca_mode,
202                descriptors: DescriptorLoop::new(&bytes[desc_start..desc_end]),
203            });
204            pos = desc_end;
205        }
206
207        if pos != events_end {
208            return Err(Error::BufferTooShort {
209                need: events_end - pos,
210                have: 0,
211                what: "EitSection trailing event bytes",
212            });
213        }
214
215        Ok(EitSection {
216            kind,
217            table_id,
218            service_id,
219            version_number,
220            current_next_indicator,
221            section_number,
222            last_section_number,
223            transport_stream_id,
224            original_network_id,
225            segment_last_section_number,
226            last_table_id,
227            events,
228        })
229    }
230}
231
232impl Serialize for EitSection<'_> {
233    type Error = crate::error::Error;
234    fn serialized_len(&self) -> usize {
235        let ev_bytes: usize = self
236            .events
237            .iter()
238            .map(|e| EVENT_HEADER_LEN + e.descriptors.len())
239            .sum();
240        MIN_HEADER_LEN + EXTENSION_HEADER_LEN + POST_EXTENSION_LEN + ev_bytes + CRC_LEN
241    }
242
243    fn serialize_into(&self, buf: &mut [u8]) -> Result<usize> {
244        let len = self.serialized_len();
245        if buf.len() < len {
246            return Err(Error::OutputBufferTooSmall {
247                need: len,
248                have: buf.len(),
249            });
250        }
251        let section_length_usize = len - MIN_HEADER_LEN;
252        if section_length_usize > 0x0FFF {
253            return Err(Error::SectionLengthOverflow {
254                declared: section_length_usize,
255                available: 0x0FFF,
256            });
257        }
258        let section_length: u16 = section_length_usize as u16;
259        buf[0] = self.table_id;
260        buf[1] = super::SECTION_B1_FLAGS_DVB | ((section_length >> 8) as u8 & 0x0F);
261        buf[2] = (section_length & 0xFF) as u8;
262        buf[3..5].copy_from_slice(&self.service_id.to_be_bytes());
263        buf[5] = 0xC0 | ((self.version_number & 0x1F) << 1) | u8::from(self.current_next_indicator);
264        buf[6] = self.section_number;
265        buf[7] = self.last_section_number;
266        buf[8..10].copy_from_slice(&self.transport_stream_id.to_be_bytes());
267        buf[10..12].copy_from_slice(&self.original_network_id.to_be_bytes());
268        buf[12] = self.segment_last_section_number;
269        buf[13] = self.last_table_id;
270
271        let mut pos = MIN_HEADER_LEN + EXTENSION_HEADER_LEN + POST_EXTENSION_LEN;
272        for ev in &self.events {
273            buf[pos..pos + 2].copy_from_slice(&ev.event_id.to_be_bytes());
274            buf[pos + 2..pos + 7].copy_from_slice(&ev.start_time_raw);
275            buf[pos + 7..pos + 10].copy_from_slice(&ev.duration_raw);
276            let dll = ev.descriptors.len() as u16;
277            buf[pos + 10] = (ev.running_status.to_u8() << 5)
278                | (u8::from(ev.free_ca_mode) << 4)
279                | ((dll >> 8) as u8 & 0x0F);
280            buf[pos + 11] = (dll & 0xFF) as u8;
281            let desc_start = pos + EVENT_HEADER_LEN;
282            buf[desc_start..desc_start + ev.descriptors.len()]
283                .copy_from_slice(ev.descriptors.raw());
284            pos = desc_start + ev.descriptors.len();
285        }
286
287        let crc_pos = len - CRC_LEN;
288        let crc = dvb_common::crc32_mpeg2::compute(&buf[..crc_pos]);
289        buf[crc_pos..len].copy_from_slice(&crc.to_be_bytes());
290        Ok(len)
291    }
292}
293impl<'a> crate::traits::TableDef<'a> for EitSection<'a> {
294    const TABLE_ID_RANGES: &'static [(u8, u8)] =
295        &[(TABLE_ID_PF_ACTUAL, TABLE_ID_SCHEDULE_OTHER_LAST)];
296    const NAME: &'static str = "EVENT_INFORMATION";
297}
298
299impl<'a> EitEvent<'a> {
300    /// Decode the 40-bit `start_time` (16-bit MJD + 24-bit BCD UTC) to a plain
301    /// date-time struct.
302    ///
303    /// Returns `None` if the date/time fields are out of range. MJD→calendar
304    /// conversion per ETSI EN 300 468 Annex C. Available without the `chrono`
305    /// feature.
306    #[must_use]
307    pub fn start_time(&self) -> Option<dvb_common::time::MjdBcdDateTime> {
308        dvb_common::time::decode_mjd_bcd(self.start_time_raw)
309    }
310
311    /// Set the event start time, encoding it into the 40-bit `start_time` field.
312    ///
313    /// # Errors
314    /// [`ValueOutOfRange`](crate::Error::ValueOutOfRange) if the date is
315    /// outside the representable 16-bit MJD range.
316    pub fn set_start_time_decoded(
317        &mut self,
318        dt: dvb_common::time::MjdBcdDateTime,
319    ) -> crate::Result<()> {
320        self.start_time_raw =
321            dvb_common::time::encode_mjd_bcd(dt).ok_or(crate::Error::ValueOutOfRange {
322                field: "EitEvent::start_time",
323                reason: "date not representable in 16-bit MJD",
324            })?;
325        Ok(())
326    }
327
328    /// Decode the 24-bit BCD `duration` (HHMMSS) to a [`core::time::Duration`].
329    ///
330    /// Returns `None` if the BCD nibbles are out of range. Available without the
331    /// `chrono` feature — a duration is a plain elapsed-seconds value.
332    #[must_use]
333    pub fn duration(&self) -> Option<core::time::Duration> {
334        dvb_common::time::decode_bcd_duration(self.duration_raw)
335    }
336
337    /// Set the event duration, encoding it into the 24-bit BCD `duration` field.
338    ///
339    /// # Errors
340    /// [`ValueOutOfRange`](crate::Error::ValueOutOfRange) if the duration
341    /// is 100 hours or longer (the `HH` field holds only two BCD digits).
342    pub fn set_duration(&mut self, duration: core::time::Duration) -> crate::Result<()> {
343        self.duration_raw = dvb_common::time::encode_bcd_duration(duration).ok_or(
344            crate::Error::ValueOutOfRange {
345                field: "EitEvent::duration",
346                reason: "duration must be < 100 hours",
347            },
348        )?;
349        Ok(())
350    }
351
352    /// Raw 5-byte start_time field (for serialization and round-trip).
353    #[must_use]
354    pub fn start_time_raw(&self) -> [u8; 5] {
355        self.start_time_raw
356    }
357
358    /// Raw 3-byte duration field (for serialization and round-trip).
359    #[must_use]
360    pub fn duration_raw(&self) -> [u8; 3] {
361        self.duration_raw
362    }
363
364    /// Construct an `EitEvent` from raw wire fields.
365    ///
366    /// This is the stable public constructor — the `start_time_raw` and
367    /// `duration_raw` fields are `pub(crate)` for in-crate parse/serialize
368    /// only.
369    #[allow(clippy::too_many_arguments)]
370    #[must_use]
371    pub fn new(
372        event_id: u16,
373        start_time_raw: [u8; 5],
374        duration_raw: [u8; 3],
375        running_status: RunningStatus,
376        free_ca_mode: bool,
377        descriptors: DescriptorLoop<'a>,
378    ) -> Self {
379        Self {
380            event_id,
381            start_time_raw,
382            duration_raw,
383            running_status,
384            free_ca_mode,
385            descriptors,
386        }
387    }
388}
389
390#[cfg(feature = "chrono")]
391impl EitEvent<'_> {
392    /// Decode `start_time_raw` (16-bit MJD + 24-bit BCD UTC) to a UTC datetime.
393    ///
394    /// Returns `None` if the date/time fields are out of range. MJD→calendar
395    /// conversion per ETSI EN 300 468 Annex C.
396    #[must_use]
397    pub fn start_time_chrono(&self) -> Option<chrono::DateTime<chrono::Utc>> {
398        dvb_common::time::decode_mjd_bcd_utc(self.start_time_raw)
399    }
400
401    /// Set the event start time, encoding it into the 40-bit `start_time` field.
402    ///
403    /// # Errors
404    /// [`ValueOutOfRange`](crate::Error::ValueOutOfRange) if the date is
405    /// outside the representable 16-bit MJD range.
406    pub fn set_start_time(
407        &mut self,
408        start_time: chrono::DateTime<chrono::Utc>,
409    ) -> crate::Result<()> {
410        self.start_time_raw = dvb_common::time::encode_mjd_bcd_utc(start_time).ok_or(
411            crate::Error::ValueOutOfRange {
412                field: "EitEvent::start_time",
413                reason: "date not representable in 16-bit MJD",
414            },
415        )?;
416        Ok(())
417    }
418}
419
420#[cfg(test)]
421mod tests {
422    use super::*;
423
424    type TestEvent = (u16, [u8; 5], [u8; 3], u8, bool, Vec<u8>);
425
426    fn build_eit(
427        table_id: u8,
428        service_id: u16,
429        version: u8,
430        tsid: u16,
431        onid: u16,
432        events: &[TestEvent],
433    ) -> Vec<u8> {
434        let ev_bytes: usize = events
435            .iter()
436            .map(|(_, _, _, _, _, d)| EVENT_HEADER_LEN + d.len())
437            .sum();
438        let section_length: u16 =
439            (EXTENSION_HEADER_LEN + POST_EXTENSION_LEN + ev_bytes + CRC_LEN) as u16;
440        let mut v = Vec::new();
441        v.push(table_id);
442        v.push(super::super::SECTION_B1_FLAGS_DVB | ((section_length >> 8) as u8 & 0x0F));
443        v.push((section_length & 0xFF) as u8);
444        v.extend_from_slice(&service_id.to_be_bytes());
445        v.push(0xC0 | ((version & 0x1F) << 1) | 0x01);
446        v.push(0);
447        v.push(0);
448        v.extend_from_slice(&tsid.to_be_bytes());
449        v.extend_from_slice(&onid.to_be_bytes());
450        v.push(0);
451        v.push(table_id);
452        for (eid, start, dur, rs, fca, desc) in events {
453            v.extend_from_slice(&eid.to_be_bytes());
454            v.extend_from_slice(start);
455            v.extend_from_slice(dur);
456            let dll = desc.len() as u16;
457            v.push(((*rs & 0x07) << 5) | (u8::from(*fca) << 4) | ((dll >> 8) as u8 & 0x0F));
458            v.push((dll & 0xFF) as u8);
459            v.extend_from_slice(desc);
460        }
461        v.extend_from_slice(&[0, 0, 0, 0]);
462        v
463    }
464
465    #[test]
466    fn parse_pf_actual_and_other_map_to_correct_kind() {
467        for (tid, expected) in [
468            (TABLE_ID_PF_ACTUAL, EitKind::PresentFollowingActual),
469            (TABLE_ID_PF_OTHER, EitKind::PresentFollowingOther),
470        ] {
471            let bytes = build_eit(tid, 1, 0, 0x20, 0x30, &[]);
472            assert_eq!(EitSection::parse(&bytes).unwrap().kind, expected);
473        }
474    }
475
476    #[test]
477    fn schedule_tables_0x50_through_0x5f_all_decode_as_schedule_actual() {
478        for tid in TABLE_ID_SCHEDULE_ACTUAL_FIRST..=TABLE_ID_SCHEDULE_ACTUAL_LAST {
479            let bytes = build_eit(tid, 1, 0, 0x20, 0x30, &[]);
480            assert_eq!(
481                EitSection::parse(&bytes).unwrap().kind,
482                EitKind::ScheduleActual
483            );
484        }
485    }
486
487    #[test]
488    fn schedule_tables_0x60_through_0x6f_all_decode_as_schedule_other() {
489        for tid in TABLE_ID_SCHEDULE_OTHER_FIRST..=TABLE_ID_SCHEDULE_OTHER_LAST {
490            let bytes = build_eit(tid, 1, 0, 0x20, 0x30, &[]);
491            assert_eq!(
492                EitSection::parse(&bytes).unwrap().kind,
493                EitKind::ScheduleOther
494            );
495        }
496    }
497
498    #[test]
499    fn event_loop_with_descriptor_bytes_preserved() {
500        let desc = vec![0x4D, 0x05, 0x01, 0x02, 0x03, 0x04, 0x05];
501        let bytes = build_eit(
502            TABLE_ID_PF_ACTUAL,
503            1,
504            0,
505            0x20,
506            0x30,
507            &[(
508                42,
509                [0xDF, 0xA1, 0x12, 0x34, 0x56],
510                [0x00, 0x30, 0x00],
511                4,
512                false,
513                desc.clone(),
514            )],
515        );
516        let eit = EitSection::parse(&bytes).unwrap();
517        assert_eq!(eit.events.len(), 1);
518        assert_eq!(eit.events[0].event_id, 42);
519        assert_eq!(eit.events[0].descriptors.raw(), &desc[..]);
520    }
521
522    #[test]
523    fn running_status_extracted() {
524        let bytes = build_eit(
525            TABLE_ID_PF_ACTUAL,
526            1,
527            0,
528            0x20,
529            0x30,
530            &[(1, [0; 5], [0; 3], 2, false, vec![])],
531        );
532        assert_eq!(
533            EitSection::parse(&bytes).unwrap().events[0].running_status,
534            RunningStatus::StartsInAFewSeconds
535        );
536    }
537
538    #[test]
539    fn free_ca_mode_flag_extracted() {
540        let bytes = build_eit(
541            TABLE_ID_PF_ACTUAL,
542            1,
543            0,
544            0x20,
545            0x30,
546            &[(1, [0; 5], [0; 3], 0, true, vec![])],
547        );
548        assert!(EitSection::parse(&bytes).unwrap().events[0].free_ca_mode);
549    }
550
551    #[test]
552    fn serialize_round_trip_preserves_all_events() {
553        let desc1: [u8; 2] = [0x54, 0x00];
554        let eit = EitSection {
555            kind: EitKind::PresentFollowingActual,
556            table_id: TABLE_ID_PF_ACTUAL,
557            service_id: 0x0100,
558            version_number: 3,
559            current_next_indicator: true,
560            section_number: 0,
561            last_section_number: 0,
562            transport_stream_id: 0x1234,
563            original_network_id: 0x0020,
564            segment_last_section_number: 0,
565            last_table_id: TABLE_ID_PF_ACTUAL,
566            events: vec![
567                EitEvent::new(
568                    1,
569                    [0xDF, 0xA1, 0x12, 0x34, 0x56],
570                    [0x00, 0x30, 0x00],
571                    RunningStatus::Running,
572                    false,
573                    DescriptorLoop::new(&desc1),
574                ),
575                EitEvent::new(
576                    2,
577                    [0xDF, 0xA1, 0x13, 0x00, 0x00],
578                    [0x01, 0x00, 0x00],
579                    RunningStatus::NotRunning,
580                    true,
581                    DescriptorLoop::new(&[]),
582                ),
583            ],
584        };
585        let mut buf = vec![0u8; eit.serialized_len()];
586        eit.serialize_into(&mut buf).unwrap();
587        let re = EitSection::parse(&buf).unwrap();
588        assert_eq!(eit, re);
589    }
590
591    #[test]
592    fn zero_events_is_valid() {
593        let bytes = build_eit(TABLE_ID_PF_ACTUAL, 1, 0, 0x20, 0x30, &[]);
594        let eit = EitSection::parse(&bytes).unwrap();
595        assert_eq!(eit.events.len(), 0);
596    }
597
598    #[test]
599    #[cfg(feature = "chrono")]
600    fn event_start_time_decodes_to_utc_datetime() {
601        // MJD 59945 is 2023-01-01 per ETSI EN 300 468 Annex C; BCD time 12:34:56.
602        let mjd: u16 = 59945;
603        let ev = EitEvent::new(
604            1,
605            [(mjd >> 8) as u8, (mjd & 0xFF) as u8, 0x12, 0x34, 0x56],
606            [0, 0, 0],
607            RunningStatus::Undefined,
608            false,
609            DescriptorLoop::new(&[]),
610        );
611        let dt = ev.start_time_chrono().unwrap();
612        use chrono::Datelike;
613        assert_eq!(dt.year(), 2023);
614        assert_eq!(dt.month(), 1);
615        assert_eq!(dt.day(), 1);
616        use chrono::Timelike;
617        assert_eq!(dt.hour(), 12);
618        assert_eq!(dt.minute(), 34);
619        assert_eq!(dt.second(), 56);
620    }
621
622    #[test]
623    fn event_start_time_decodes_without_chrono() {
624        let mjd: u16 = 59945;
625        let ev = EitEvent::new(
626            1,
627            [(mjd >> 8) as u8, (mjd & 0xFF) as u8, 0x12, 0x34, 0x56],
628            [0, 0, 0],
629            RunningStatus::Undefined,
630            false,
631            DescriptorLoop::new(&[]),
632        );
633        let dt = ev.start_time().unwrap();
634        // MJD 59945 = 2023-01-01 per Annex C
635        assert_eq!(dt.year, 2023);
636        assert_eq!(dt.month, 1);
637        assert_eq!(dt.day, 1);
638        assert_eq!(dt.hour, 12);
639        assert_eq!(dt.minute, 34);
640        assert_eq!(dt.second, 56);
641    }
642
643    #[test]
644    fn parse_rejects_wrong_tag() {
645        let bytes = build_eit(0x00, 1, 0, 0x20, 0x30, &[]);
646        let err = EitSection::parse(&bytes).unwrap_err();
647        assert!(matches!(
648            err,
649            Error::UnexpectedTableId { table_id: 0x00, .. }
650        ));
651    }
652
653    #[test]
654    fn parse_rejects_truncated_header() {
655        let bytes = [0x4Eu8, 0xF0, 0x00];
656        let err = EitSection::parse(&bytes).unwrap_err();
657        assert!(matches!(
658            err,
659            Error::BufferTooShort {
660                need: 18,
661                have: 3,
662                ..
663            }
664        ));
665    }
666
667    #[test]
668    fn parse_rejects_event_descriptor_loop_overflow() {
669        let section_length: u16 =
670            (EXTENSION_HEADER_LEN + POST_EXTENSION_LEN + EVENT_HEADER_LEN + CRC_LEN) as u16;
671        let mut v = Vec::new();
672        v.push(TABLE_ID_PF_ACTUAL);
673        v.push(super::super::SECTION_B1_FLAGS_DVB | ((section_length >> 8) as u8 & 0x0F));
674        v.push((section_length & 0xFF) as u8);
675        v.extend_from_slice(&1u16.to_be_bytes());
676        v.push(0xC1);
677        v.push(0);
678        v.push(0);
679        v.extend_from_slice(&0x0020u16.to_be_bytes());
680        v.extend_from_slice(&0x0030u16.to_be_bytes());
681        v.push(0);
682        v.push(TABLE_ID_PF_ACTUAL);
683        v.extend_from_slice(&1u16.to_be_bytes());
684        v.extend_from_slice(&[0u8; 5]);
685        v.extend_from_slice(&[0u8; 3]);
686        v.push(0x00);
687        v.push(0x0A);
688        v.extend_from_slice(&[0u8; 4]);
689        // descriptor_loop_length=10 but events_end is at the CRC start:
690        // the declared 10 bytes overflow past the CRC boundary.
691        let err = EitSection::parse(&v).unwrap_err();
692        assert!(matches!(
693            err,
694            Error::SectionLengthOverflow { declared: 10, .. }
695        ));
696    }
697
698    #[test]
699    fn structured_fields_segment_and_last_table_id_preserved() {
700        let desc: [u8; 2] = [0x54, 0x00];
701        let bytes = build_eit(
702            TABLE_ID_SCHEDULE_ACTUAL_FIRST,
703            0x0100,
704            7,
705            0x0020,
706            0x0030,
707            &[(
708                42,
709                [0xDF, 0xA1, 0x12, 0x34, 0x56],
710                [0x00, 0x30, 0x00],
711                4,
712                false,
713                desc.to_vec(),
714            )],
715        );
716        let eit = EitSection::parse(&bytes).unwrap();
717        assert_eq!(eit.kind, EitKind::ScheduleActual);
718        assert_eq!(eit.table_id, TABLE_ID_SCHEDULE_ACTUAL_FIRST);
719        assert_eq!(eit.service_id, 0x0100);
720        assert_eq!(eit.version_number, 7);
721        assert!(eit.current_next_indicator);
722        assert_eq!(eit.section_number, 0);
723        assert_eq!(eit.last_section_number, 0);
724        assert_eq!(eit.transport_stream_id, 0x0020);
725        assert_eq!(eit.original_network_id, 0x0030);
726        assert_eq!(eit.segment_last_section_number, 0);
727        assert_eq!(eit.last_table_id, TABLE_ID_SCHEDULE_ACTUAL_FIRST);
728        assert_eq!(eit.events.len(), 1);
729        assert_eq!(eit.events[0].event_id, 42);
730        assert_eq!(eit.events[0].running_status, RunningStatus::Running);
731        assert!(!eit.events[0].free_ca_mode);
732        // 12-bit descriptor loop length decoded correctly: 2 bytes of desc.
733        assert_eq!(eit.events[0].descriptors.raw(), &desc[..]);
734    }
735
736    #[test]
737    fn parse_rejects_zero_section_length() {
738        let mut buf = vec![0u8; 64];
739        buf[0] = TABLE_ID_PF_ACTUAL;
740        buf[1] = 0xF0;
741        buf[2] = 0x00;
742        for b in &mut buf[3..] {
743            *b = 0xFF;
744        }
745        assert!(matches!(
746            EitSection::parse(&buf).unwrap_err(),
747            Error::SectionLengthOverflow { .. }
748        ));
749    }
750
751    #[test]
752    fn parse_rejects_trailing_slack_bytes() {
753        let section_length: u16 =
754            (EXTENSION_HEADER_LEN + POST_EXTENSION_LEN + EVENT_HEADER_LEN + 1 + CRC_LEN) as u16;
755        let mut v = Vec::new();
756        v.push(TABLE_ID_PF_ACTUAL);
757        v.push(super::super::SECTION_B1_FLAGS_DVB | ((section_length >> 8) as u8 & 0x0F));
758        v.push((section_length & 0xFF) as u8);
759        v.extend_from_slice(&1u16.to_be_bytes());
760        v.push(0xC1);
761        v.push(0);
762        v.push(0);
763        v.extend_from_slice(&0x0020u16.to_be_bytes());
764        v.extend_from_slice(&0x0030u16.to_be_bytes());
765        v.push(0);
766        v.push(TABLE_ID_PF_ACTUAL);
767        v.extend_from_slice(&1u16.to_be_bytes());
768        v.extend_from_slice(&[0u8; 5]);
769        v.extend_from_slice(&[0u8; 3]);
770        v.push(0x00);
771        v.push(0x00);
772        v.push(0xFF);
773        v.extend_from_slice(&[0u8; 4]);
774        let err = EitSection::parse(&v).unwrap_err();
775        assert!(matches!(
776            err,
777            Error::BufferTooShort {
778                what: "EitSection trailing event bytes",
779                ..
780            }
781        ));
782    }
783}
dvb_si/tables/eit.rs

dvb_si/tables/
eit.rs
