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..].first_chunk::<2>().unwrap());
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..].first_chunk::<2>().unwrap());
165        let original_network_id = u16::from_be_bytes(*bytes[10..].first_chunk::<2>().unwrap());
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 (b2, _) = bytes[pos..]
175                .split_first_chunk::<2>()
176                .ok_or(Error::BufferTooShort {
177                    need: pos + 2,
178                    have: events_end,
179                    what: "EitSection event_id",
180                })?;
181            let event_id = u16::from_be_bytes(*b2);
182            let start_time_raw = [
183                bytes[pos + 2],
184                bytes[pos + 3],
185                bytes[pos + 4],
186                bytes[pos + 5],
187                bytes[pos + 6],
188            ];
189            let duration_raw = [bytes[pos + 7], bytes[pos + 8], bytes[pos + 9]];
190            let status_and_len_hi = bytes[pos + 10];
191            let running_status = RunningStatus::from_u8((status_and_len_hi >> 5) & 0x07);
192            let free_ca_mode = (status_and_len_hi & 0x10) != 0;
193            let descriptors_loop_length =
194                (((status_and_len_hi & 0x0F) as usize) << 8) | bytes[pos + 11] as usize;
195            let desc_start = pos + EVENT_HEADER_LEN;
196            let desc_end = desc_start + descriptors_loop_length;
197            if desc_end > events_end {
198                return Err(Error::SectionLengthOverflow {
199                    declared: descriptors_loop_length,
200                    available: events_end.saturating_sub(desc_start),
201                });
202            }
203            events.push(EitEvent {
204                event_id,
205                start_time_raw,
206                duration_raw,
207                running_status,
208                free_ca_mode,
209                descriptors: DescriptorLoop::new(&bytes[desc_start..desc_end]),
210            });
211            pos = desc_end;
212        }
213
214        if pos != events_end {
215            return Err(Error::BufferTooShort {
216                need: events_end - pos,
217                have: 0,
218                what: "EitSection trailing event bytes",
219            });
220        }
221
222        Ok(EitSection {
223            kind,
224            table_id,
225            service_id,
226            version_number,
227            current_next_indicator,
228            section_number,
229            last_section_number,
230            transport_stream_id,
231            original_network_id,
232            segment_last_section_number,
233            last_table_id,
234            events,
235        })
236    }
237}
238
239impl Serialize for EitSection<'_> {
240    type Error = crate::error::Error;
241    fn serialized_len(&self) -> usize {
242        let ev_bytes: usize = self
243            .events
244            .iter()
245            .map(|e| EVENT_HEADER_LEN + e.descriptors.len())
246            .sum();
247        MIN_HEADER_LEN + EXTENSION_HEADER_LEN + POST_EXTENSION_LEN + ev_bytes + CRC_LEN
248    }
249
250    fn serialize_into(&self, buf: &mut [u8]) -> Result<usize> {
251        let len = self.serialized_len();
252        if buf.len() < len {
253            return Err(Error::OutputBufferTooSmall {
254                need: len,
255                have: buf.len(),
256            });
257        }
258        let section_length_usize = len - MIN_HEADER_LEN;
259        if section_length_usize > 0x0FFF {
260            return Err(Error::SectionLengthOverflow {
261                declared: section_length_usize,
262                available: 0x0FFF,
263            });
264        }
265        let section_length: u16 = section_length_usize as u16;
266        buf[0] = self.table_id;
267        buf[1] = super::SECTION_B1_FLAGS_DVB | ((section_length >> 8) as u8 & 0x0F);
268        buf[2] = (section_length & 0xFF) as u8;
269        buf[3..5].copy_from_slice(&self.service_id.to_be_bytes());
270        buf[5] = 0xC0 | ((self.version_number & 0x1F) << 1) | u8::from(self.current_next_indicator);
271        buf[6] = self.section_number;
272        buf[7] = self.last_section_number;
273        buf[8..10].copy_from_slice(&self.transport_stream_id.to_be_bytes());
274        buf[10..12].copy_from_slice(&self.original_network_id.to_be_bytes());
275        buf[12] = self.segment_last_section_number;
276        buf[13] = self.last_table_id;
277
278        let mut pos = MIN_HEADER_LEN + EXTENSION_HEADER_LEN + POST_EXTENSION_LEN;
279        for ev in &self.events {
280            buf[pos..pos + 2].copy_from_slice(&ev.event_id.to_be_bytes());
281            buf[pos + 2..pos + 7].copy_from_slice(&ev.start_time_raw);
282            buf[pos + 7..pos + 10].copy_from_slice(&ev.duration_raw);
283            let dll = ev.descriptors.len() as u16;
284            buf[pos + 10] = (ev.running_status.to_u8() << 5)
285                | (u8::from(ev.free_ca_mode) << 4)
286                | ((dll >> 8) as u8 & 0x0F);
287            buf[pos + 11] = (dll & 0xFF) as u8;
288            let desc_start = pos + EVENT_HEADER_LEN;
289            buf[desc_start..desc_start + ev.descriptors.len()]
290                .copy_from_slice(ev.descriptors.raw());
291            pos = desc_start + ev.descriptors.len();
292        }
293
294        let crc_pos = len - CRC_LEN;
295        let crc = dvb_common::crc32_mpeg2::compute(&buf[..crc_pos]);
296        buf[crc_pos..len].copy_from_slice(&crc.to_be_bytes());
297        Ok(len)
298    }
299}
300impl<'a> crate::traits::TableDef<'a> for EitSection<'a> {
301    const TABLE_ID_RANGES: &'static [(u8, u8)] =
302        &[(TABLE_ID_PF_ACTUAL, TABLE_ID_SCHEDULE_OTHER_LAST)];
303    const NAME: &'static str = "EVENT_INFORMATION";
304}
305
306impl<'a> EitEvent<'a> {
307    /// Decode the 40-bit `start_time` (16-bit MJD + 24-bit BCD UTC) to a plain
308    /// date-time struct.
309    ///
310    /// Returns `None` if the date/time fields are out of range. MJD→calendar
311    /// conversion per ETSI EN 300 468 Annex C. Available without the `chrono`
312    /// feature.
313    #[must_use]
314    pub fn start_time(&self) -> Option<dvb_common::time::MjdBcdDateTime> {
315        dvb_common::time::decode_mjd_bcd(self.start_time_raw)
316    }
317
318    /// Set the event start time, encoding it into the 40-bit `start_time` field.
319    ///
320    /// # Errors
321    /// [`ValueOutOfRange`](crate::Error::ValueOutOfRange) if the date is
322    /// outside the representable 16-bit MJD range.
323    pub fn set_start_time_decoded(
324        &mut self,
325        dt: dvb_common::time::MjdBcdDateTime,
326    ) -> crate::Result<()> {
327        self.start_time_raw =
328            dvb_common::time::encode_mjd_bcd(dt).ok_or(crate::Error::ValueOutOfRange {
329                field: "EitEvent::start_time",
330                reason: "date not representable in 16-bit MJD",
331            })?;
332        Ok(())
333    }
334
335    /// Decode the 24-bit BCD `duration` (HHMMSS) to a [`core::time::Duration`].
336    ///
337    /// Returns `None` if the BCD nibbles are out of range. Available without the
338    /// `chrono` feature — a duration is a plain elapsed-seconds value.
339    #[must_use]
340    pub fn duration(&self) -> Option<core::time::Duration> {
341        dvb_common::time::decode_bcd_duration(self.duration_raw)
342    }
343
344    /// Set the event duration, encoding it into the 24-bit BCD `duration` field.
345    ///
346    /// # Errors
347    /// [`ValueOutOfRange`](crate::Error::ValueOutOfRange) if the duration
348    /// is 100 hours or longer (the `HH` field holds only two BCD digits).
349    pub fn set_duration(&mut self, duration: core::time::Duration) -> crate::Result<()> {
350        self.duration_raw = dvb_common::time::encode_bcd_duration(duration).ok_or(
351            crate::Error::ValueOutOfRange {
352                field: "EitEvent::duration",
353                reason: "duration must be < 100 hours",
354            },
355        )?;
356        Ok(())
357    }
358
359    /// Raw 5-byte start_time field (for serialization and round-trip).
360    #[must_use]
361    pub fn start_time_raw(&self) -> [u8; 5] {
362        self.start_time_raw
363    }
364
365    /// Raw 3-byte duration field (for serialization and round-trip).
366    #[must_use]
367    pub fn duration_raw(&self) -> [u8; 3] {
368        self.duration_raw
369    }
370
371    /// Construct an `EitEvent` from raw wire fields.
372    ///
373    /// This is the stable public constructor — the `start_time_raw` and
374    /// `duration_raw` fields are `pub(crate)` for in-crate parse/serialize
375    /// only.
376    #[allow(clippy::too_many_arguments)]
377    #[must_use]
378    pub fn new(
379        event_id: u16,
380        start_time_raw: [u8; 5],
381        duration_raw: [u8; 3],
382        running_status: RunningStatus,
383        free_ca_mode: bool,
384        descriptors: DescriptorLoop<'a>,
385    ) -> Self {
386        Self {
387            event_id,
388            start_time_raw,
389            duration_raw,
390            running_status,
391            free_ca_mode,
392            descriptors,
393        }
394    }
395}
396
397#[cfg(feature = "chrono")]
398impl EitEvent<'_> {
399    /// Decode `start_time_raw` (16-bit MJD + 24-bit BCD UTC) to a UTC datetime.
400    ///
401    /// Returns `None` if the date/time fields are out of range. MJD→calendar
402    /// conversion per ETSI EN 300 468 Annex C.
403    #[must_use]
404    pub fn start_time_chrono(&self) -> Option<chrono::DateTime<chrono::Utc>> {
405        dvb_common::time::decode_mjd_bcd_utc(self.start_time_raw)
406    }
407
408    /// Set the event start time, encoding it into the 40-bit `start_time` field.
409    ///
410    /// # Errors
411    /// [`ValueOutOfRange`](crate::Error::ValueOutOfRange) if the date is
412    /// outside the representable 16-bit MJD range.
413    pub fn set_start_time(
414        &mut self,
415        start_time: chrono::DateTime<chrono::Utc>,
416    ) -> crate::Result<()> {
417        self.start_time_raw = dvb_common::time::encode_mjd_bcd_utc(start_time).ok_or(
418            crate::Error::ValueOutOfRange {
419                field: "EitEvent::start_time",
420                reason: "date not representable in 16-bit MJD",
421            },
422        )?;
423        Ok(())
424    }
425}
426
427#[cfg(test)]
428mod tests {
429    use super::*;
430
431    type TestEvent = (u16, [u8; 5], [u8; 3], u8, bool, Vec<u8>);
432
433    fn build_eit(
434        table_id: u8,
435        service_id: u16,
436        version: u8,
437        tsid: u16,
438        onid: u16,
439        events: &[TestEvent],
440    ) -> Vec<u8> {
441        let ev_bytes: usize = events
442            .iter()
443            .map(|(_, _, _, _, _, d)| EVENT_HEADER_LEN + d.len())
444            .sum();
445        let section_length: u16 =
446            (EXTENSION_HEADER_LEN + POST_EXTENSION_LEN + ev_bytes + CRC_LEN) as u16;
447        let mut v = Vec::new();
448        v.push(table_id);
449        v.push(super::super::SECTION_B1_FLAGS_DVB | ((section_length >> 8) as u8 & 0x0F));
450        v.push((section_length & 0xFF) as u8);
451        v.extend_from_slice(&service_id.to_be_bytes());
452        v.push(0xC0 | ((version & 0x1F) << 1) | 0x01);
453        v.push(0);
454        v.push(0);
455        v.extend_from_slice(&tsid.to_be_bytes());
456        v.extend_from_slice(&onid.to_be_bytes());
457        v.push(0);
458        v.push(table_id);
459        for (eid, start, dur, rs, fca, desc) in events {
460            v.extend_from_slice(&eid.to_be_bytes());
461            v.extend_from_slice(start);
462            v.extend_from_slice(dur);
463            let dll = desc.len() as u16;
464            v.push(((*rs & 0x07) << 5) | (u8::from(*fca) << 4) | ((dll >> 8) as u8 & 0x0F));
465            v.push((dll & 0xFF) as u8);
466            v.extend_from_slice(desc);
467        }
468        v.extend_from_slice(&[0, 0, 0, 0]);
469        v
470    }
471
472    #[test]
473    fn parse_pf_actual_and_other_map_to_correct_kind() {
474        for (tid, expected) in [
475            (TABLE_ID_PF_ACTUAL, EitKind::PresentFollowingActual),
476            (TABLE_ID_PF_OTHER, EitKind::PresentFollowingOther),
477        ] {
478            let bytes = build_eit(tid, 1, 0, 0x20, 0x30, &[]);
479            assert_eq!(EitSection::parse(&bytes).unwrap().kind, expected);
480        }
481    }
482
483    #[test]
484    fn schedule_tables_0x50_through_0x5f_all_decode_as_schedule_actual() {
485        for tid in TABLE_ID_SCHEDULE_ACTUAL_FIRST..=TABLE_ID_SCHEDULE_ACTUAL_LAST {
486            let bytes = build_eit(tid, 1, 0, 0x20, 0x30, &[]);
487            assert_eq!(
488                EitSection::parse(&bytes).unwrap().kind,
489                EitKind::ScheduleActual
490            );
491        }
492    }
493
494    #[test]
495    fn schedule_tables_0x60_through_0x6f_all_decode_as_schedule_other() {
496        for tid in TABLE_ID_SCHEDULE_OTHER_FIRST..=TABLE_ID_SCHEDULE_OTHER_LAST {
497            let bytes = build_eit(tid, 1, 0, 0x20, 0x30, &[]);
498            assert_eq!(
499                EitSection::parse(&bytes).unwrap().kind,
500                EitKind::ScheduleOther
501            );
502        }
503    }
504
505    #[test]
506    fn event_loop_with_descriptor_bytes_preserved() {
507        let desc = vec![0x4D, 0x05, 0x01, 0x02, 0x03, 0x04, 0x05];
508        let bytes = build_eit(
509            TABLE_ID_PF_ACTUAL,
510            1,
511            0,
512            0x20,
513            0x30,
514            &[(
515                42,
516                [0xDF, 0xA1, 0x12, 0x34, 0x56],
517                [0x00, 0x30, 0x00],
518                4,
519                false,
520                desc.clone(),
521            )],
522        );
523        let eit = EitSection::parse(&bytes).unwrap();
524        assert_eq!(eit.events.len(), 1);
525        assert_eq!(eit.events[0].event_id, 42);
526        assert_eq!(eit.events[0].descriptors.raw(), &desc[..]);
527    }
528
529    #[test]
530    fn running_status_extracted() {
531        let bytes = build_eit(
532            TABLE_ID_PF_ACTUAL,
533            1,
534            0,
535            0x20,
536            0x30,
537            &[(1, [0; 5], [0; 3], 2, false, vec![])],
538        );
539        assert_eq!(
540            EitSection::parse(&bytes).unwrap().events[0].running_status,
541            RunningStatus::StartsInAFewSeconds
542        );
543    }
544
545    #[test]
546    fn free_ca_mode_flag_extracted() {
547        let bytes = build_eit(
548            TABLE_ID_PF_ACTUAL,
549            1,
550            0,
551            0x20,
552            0x30,
553            &[(1, [0; 5], [0; 3], 0, true, vec![])],
554        );
555        assert!(EitSection::parse(&bytes).unwrap().events[0].free_ca_mode);
556    }
557
558    #[test]
559    fn serialize_round_trip_preserves_all_events() {
560        let desc1: [u8; 2] = [0x54, 0x00];
561        let eit = EitSection {
562            kind: EitKind::PresentFollowingActual,
563            table_id: TABLE_ID_PF_ACTUAL,
564            service_id: 0x0100,
565            version_number: 3,
566            current_next_indicator: true,
567            section_number: 0,
568            last_section_number: 0,
569            transport_stream_id: 0x1234,
570            original_network_id: 0x0020,
571            segment_last_section_number: 0,
572            last_table_id: TABLE_ID_PF_ACTUAL,
573            events: vec![
574                EitEvent::new(
575                    1,
576                    [0xDF, 0xA1, 0x12, 0x34, 0x56],
577                    [0x00, 0x30, 0x00],
578                    RunningStatus::Running,
579                    false,
580                    DescriptorLoop::new(&desc1),
581                ),
582                EitEvent::new(
583                    2,
584                    [0xDF, 0xA1, 0x13, 0x00, 0x00],
585                    [0x01, 0x00, 0x00],
586                    RunningStatus::NotRunning,
587                    true,
588                    DescriptorLoop::new(&[]),
589                ),
590            ],
591        };
592        let mut buf = vec![0u8; eit.serialized_len()];
593        eit.serialize_into(&mut buf).unwrap();
594        let re = EitSection::parse(&buf).unwrap();
595        assert_eq!(eit, re);
596    }
597
598    #[test]
599    fn zero_events_is_valid() {
600        let bytes = build_eit(TABLE_ID_PF_ACTUAL, 1, 0, 0x20, 0x30, &[]);
601        let eit = EitSection::parse(&bytes).unwrap();
602        assert_eq!(eit.events.len(), 0);
603    }
604
605    #[test]
606    #[cfg(feature = "chrono")]
607    fn event_start_time_decodes_to_utc_datetime() {
608        // MJD 59945 is 2023-01-01 per ETSI EN 300 468 Annex C; BCD time 12:34:56.
609        let mjd: u16 = 59945;
610        let ev = EitEvent::new(
611            1,
612            [(mjd >> 8) as u8, (mjd & 0xFF) as u8, 0x12, 0x34, 0x56],
613            [0, 0, 0],
614            RunningStatus::Undefined,
615            false,
616            DescriptorLoop::new(&[]),
617        );
618        let dt = ev.start_time_chrono().unwrap();
619        use chrono::Datelike;
620        assert_eq!(dt.year(), 2023);
621        assert_eq!(dt.month(), 1);
622        assert_eq!(dt.day(), 1);
623        use chrono::Timelike;
624        assert_eq!(dt.hour(), 12);
625        assert_eq!(dt.minute(), 34);
626        assert_eq!(dt.second(), 56);
627    }
628
629    #[test]
630    fn event_start_time_decodes_without_chrono() {
631        let mjd: u16 = 59945;
632        let ev = EitEvent::new(
633            1,
634            [(mjd >> 8) as u8, (mjd & 0xFF) as u8, 0x12, 0x34, 0x56],
635            [0, 0, 0],
636            RunningStatus::Undefined,
637            false,
638            DescriptorLoop::new(&[]),
639        );
640        let dt = ev.start_time().unwrap();
641        // MJD 59945 = 2023-01-01 per Annex C
642        assert_eq!(dt.year, 2023);
643        assert_eq!(dt.month, 1);
644        assert_eq!(dt.day, 1);
645        assert_eq!(dt.hour, 12);
646        assert_eq!(dt.minute, 34);
647        assert_eq!(dt.second, 56);
648    }
649
650    #[test]
651    fn parse_rejects_wrong_tag() {
652        let bytes = build_eit(0x00, 1, 0, 0x20, 0x30, &[]);
653        let err = EitSection::parse(&bytes).unwrap_err();
654        assert!(matches!(
655            err,
656            Error::UnexpectedTableId { table_id: 0x00, .. }
657        ));
658    }
659
660    #[test]
661    fn parse_rejects_truncated_header() {
662        let bytes = [0x4Eu8, 0xF0, 0x00];
663        let err = EitSection::parse(&bytes).unwrap_err();
664        assert!(matches!(
665            err,
666            Error::BufferTooShort {
667                need: 18,
668                have: 3,
669                ..
670            }
671        ));
672    }
673
674    #[test]
675    fn parse_rejects_event_descriptor_loop_overflow() {
676        let section_length: u16 =
677            (EXTENSION_HEADER_LEN + POST_EXTENSION_LEN + EVENT_HEADER_LEN + CRC_LEN) as u16;
678        let mut v = Vec::new();
679        v.push(TABLE_ID_PF_ACTUAL);
680        v.push(super::super::SECTION_B1_FLAGS_DVB | ((section_length >> 8) as u8 & 0x0F));
681        v.push((section_length & 0xFF) as u8);
682        v.extend_from_slice(&1u16.to_be_bytes());
683        v.push(0xC1);
684        v.push(0);
685        v.push(0);
686        v.extend_from_slice(&0x0020u16.to_be_bytes());
687        v.extend_from_slice(&0x0030u16.to_be_bytes());
688        v.push(0);
689        v.push(TABLE_ID_PF_ACTUAL);
690        v.extend_from_slice(&1u16.to_be_bytes());
691        v.extend_from_slice(&[0u8; 5]);
692        v.extend_from_slice(&[0u8; 3]);
693        v.push(0x00);
694        v.push(0x0A);
695        v.extend_from_slice(&[0u8; 4]);
696        // descriptor_loop_length=10 but events_end is at the CRC start:
697        // the declared 10 bytes overflow past the CRC boundary.
698        let err = EitSection::parse(&v).unwrap_err();
699        assert!(matches!(
700            err,
701            Error::SectionLengthOverflow { declared: 10, .. }
702        ));
703    }
704
705    #[test]
706    fn structured_fields_segment_and_last_table_id_preserved() {
707        let desc: [u8; 2] = [0x54, 0x00];
708        let bytes = build_eit(
709            TABLE_ID_SCHEDULE_ACTUAL_FIRST,
710            0x0100,
711            7,
712            0x0020,
713            0x0030,
714            &[(
715                42,
716                [0xDF, 0xA1, 0x12, 0x34, 0x56],
717                [0x00, 0x30, 0x00],
718                4,
719                false,
720                desc.to_vec(),
721            )],
722        );
723        let eit = EitSection::parse(&bytes).unwrap();
724        assert_eq!(eit.kind, EitKind::ScheduleActual);
725        assert_eq!(eit.table_id, TABLE_ID_SCHEDULE_ACTUAL_FIRST);
726        assert_eq!(eit.service_id, 0x0100);
727        assert_eq!(eit.version_number, 7);
728        assert!(eit.current_next_indicator);
729        assert_eq!(eit.section_number, 0);
730        assert_eq!(eit.last_section_number, 0);
731        assert_eq!(eit.transport_stream_id, 0x0020);
732        assert_eq!(eit.original_network_id, 0x0030);
733        assert_eq!(eit.segment_last_section_number, 0);
734        assert_eq!(eit.last_table_id, TABLE_ID_SCHEDULE_ACTUAL_FIRST);
735        assert_eq!(eit.events.len(), 1);
736        assert_eq!(eit.events[0].event_id, 42);
737        assert_eq!(eit.events[0].running_status, RunningStatus::Running);
738        assert!(!eit.events[0].free_ca_mode);
739        // 12-bit descriptor loop length decoded correctly: 2 bytes of desc.
740        assert_eq!(eit.events[0].descriptors.raw(), &desc[..]);
741    }
742
743    #[test]
744    fn parse_rejects_zero_section_length() {
745        let mut buf = vec![0u8; 64];
746        buf[0] = TABLE_ID_PF_ACTUAL;
747        buf[1] = 0xF0;
748        buf[2] = 0x00;
749        for b in &mut buf[3..] {
750            *b = 0xFF;
751        }
752        assert!(matches!(
753            EitSection::parse(&buf).unwrap_err(),
754            Error::SectionLengthOverflow { .. }
755        ));
756    }
757
758    #[test]
759    fn parse_rejects_trailing_slack_bytes() {
760        let section_length: u16 =
761            (EXTENSION_HEADER_LEN + POST_EXTENSION_LEN + EVENT_HEADER_LEN + 1 + CRC_LEN) as u16;
762        let mut v = Vec::new();
763        v.push(TABLE_ID_PF_ACTUAL);
764        v.push(super::super::SECTION_B1_FLAGS_DVB | ((section_length >> 8) as u8 & 0x0F));
765        v.push((section_length & 0xFF) as u8);
766        v.extend_from_slice(&1u16.to_be_bytes());
767        v.push(0xC1);
768        v.push(0);
769        v.push(0);
770        v.extend_from_slice(&0x0020u16.to_be_bytes());
771        v.extend_from_slice(&0x0030u16.to_be_bytes());
772        v.push(0);
773        v.push(TABLE_ID_PF_ACTUAL);
774        v.extend_from_slice(&1u16.to_be_bytes());
775        v.extend_from_slice(&[0u8; 5]);
776        v.extend_from_slice(&[0u8; 3]);
777        v.push(0x00);
778        v.push(0x00);
779        v.push(0xFF);
780        v.extend_from_slice(&[0u8; 4]);
781        let err = EitSection::parse(&v).unwrap_err();
782        assert!(matches!(
783            err,
784            Error::BufferTooShort {
785                what: "EitSection trailing event bytes",
786                ..
787            }
788        ));
789    }
790}
dvb_si/tables/eit.rs

dvb_si/tables/
eit.rs
