fn read_ilst()

in mp4parse/src/lib.rs [6009:6110]
102 lines of code
4 McCabe index (conditional complexity)

fn read_ilst<T: Read>(src: &mut BMFFBox<T>, meta: &mut MetadataBox) -> Result<()> {
    let mut iter = src.box_iter();
    while let Some(mut b) = iter.next_box()? {
        match b.head.name {
            BoxType::AlbumEntry => meta.album = read_ilst_string_data(&mut b)?,
            BoxType::ArtistEntry | BoxType::ArtistLowercaseEntry => {
                meta.artist = read_ilst_string_data(&mut b)?
            }
            BoxType::AlbumArtistEntry => meta.album_artist = read_ilst_string_data(&mut b)?,
            BoxType::CommentEntry => meta.comment = read_ilst_string_data(&mut b)?,
            BoxType::DateEntry => meta.year = read_ilst_string_data(&mut b)?,
            BoxType::TitleEntry => meta.title = read_ilst_string_data(&mut b)?,
            BoxType::CustomGenreEntry => {
                meta.genre = read_ilst_string_data(&mut b)?.map(Genre::CustomGenre)
            }
            BoxType::StandardGenreEntry => {
                meta.genre = read_ilst_u8_data(&mut b)?
                    .and_then(|gnre| Some(Genre::StandardGenre(gnre.get(1).copied()?)))
            }
            BoxType::ComposerEntry => meta.composer = read_ilst_string_data(&mut b)?,
            BoxType::EncoderEntry => meta.encoder = read_ilst_string_data(&mut b)?,
            BoxType::EncodedByEntry => meta.encoded_by = read_ilst_string_data(&mut b)?,
            BoxType::CopyrightEntry => meta.copyright = read_ilst_string_data(&mut b)?,
            BoxType::GroupingEntry => meta.grouping = read_ilst_string_data(&mut b)?,
            BoxType::CategoryEntry => meta.category = read_ilst_string_data(&mut b)?,
            BoxType::KeywordEntry => meta.keyword = read_ilst_string_data(&mut b)?,
            BoxType::PodcastUrlEntry => meta.podcast_url = read_ilst_string_data(&mut b)?,
            BoxType::PodcastGuidEntry => meta.podcast_guid = read_ilst_string_data(&mut b)?,
            BoxType::DescriptionEntry => meta.description = read_ilst_string_data(&mut b)?,
            BoxType::LongDescriptionEntry => meta.long_description = read_ilst_string_data(&mut b)?,
            BoxType::LyricsEntry => meta.lyrics = read_ilst_string_data(&mut b)?,
            BoxType::TVNetworkNameEntry => meta.tv_network_name = read_ilst_string_data(&mut b)?,
            BoxType::TVEpisodeNameEntry => meta.tv_episode_name = read_ilst_string_data(&mut b)?,
            BoxType::TVShowNameEntry => meta.tv_show_name = read_ilst_string_data(&mut b)?,
            BoxType::PurchaseDateEntry => meta.purchase_date = read_ilst_string_data(&mut b)?,
            BoxType::RatingEntry => meta.rating = read_ilst_string_data(&mut b)?,
            BoxType::OwnerEntry => meta.owner = read_ilst_string_data(&mut b)?,
            BoxType::HDVideoEntry => meta.hd_video = read_ilst_bool_data(&mut b)?,
            BoxType::SortNameEntry => meta.sort_name = read_ilst_string_data(&mut b)?,
            BoxType::SortArtistEntry => meta.sort_artist = read_ilst_string_data(&mut b)?,
            BoxType::SortAlbumEntry => meta.sort_album = read_ilst_string_data(&mut b)?,
            BoxType::SortAlbumArtistEntry => {
                meta.sort_album_artist = read_ilst_string_data(&mut b)?
            }
            BoxType::SortComposerEntry => meta.sort_composer = read_ilst_string_data(&mut b)?,
            BoxType::TrackNumberEntry => {
                if let Some(trkn) = read_ilst_u8_data(&mut b)? {
                    meta.track_number = trkn.get(3).copied();
                    meta.total_tracks = trkn.get(5).copied();
                };
            }
            BoxType::DiskNumberEntry => {
                if let Some(disk) = read_ilst_u8_data(&mut b)? {
                    meta.disc_number = disk.get(3).copied();
                    meta.total_discs = disk.get(5).copied();
                };
            }
            BoxType::TempoEntry => {
                meta.beats_per_minute =
                    read_ilst_u8_data(&mut b)?.and_then(|tmpo| tmpo.get(1).copied())
            }
            BoxType::CompilationEntry => meta.compilation = read_ilst_bool_data(&mut b)?,
            BoxType::AdvisoryEntry => {
                meta.advisory = read_ilst_u8_data(&mut b)?.and_then(|rtng| {
                    Some(match rtng.first()? {
                        2 => AdvisoryRating::Clean,
                        0 => AdvisoryRating::Inoffensive,
                        r => AdvisoryRating::Explicit(*r),
                    })
                })
            }
            BoxType::MediaTypeEntry => {
                meta.media_type = read_ilst_u8_data(&mut b)?.and_then(|stik| {
                    Some(match stik.first()? {
                        0 => MediaType::Movie,
                        1 => MediaType::Normal,
                        2 => MediaType::AudioBook,
                        5 => MediaType::WhackedBookmark,
                        6 => MediaType::MusicVideo,
                        9 => MediaType::ShortFilm,
                        10 => MediaType::TVShow,
                        11 => MediaType::Booklet,
                        s => MediaType::Unknown(*s),
                    })
                })
            }
            BoxType::PodcastEntry => meta.podcast = read_ilst_bool_data(&mut b)?,
            BoxType::TVSeasonNumberEntry => {
                meta.tv_season = read_ilst_u8_data(&mut b)?.and_then(|tvsn| tvsn.get(3).copied())
            }
            BoxType::TVEpisodeNumberEntry => {
                meta.tv_episode_number =
                    read_ilst_u8_data(&mut b)?.and_then(|tves| tves.get(3).copied())
            }
            BoxType::GaplessPlaybackEntry => meta.gapless_playback = read_ilst_bool_data(&mut b)?,
            BoxType::CoverArtEntry => meta.cover_art = read_ilst_multiple_u8_data(&mut b).ok(),
            _ => skip_box_content(&mut b)?,
        };
        check_parser_state!(b.content);
    }
    Ok(())
}