ITunesDB/src/deserializer.rs

use log::{info, warn};

use crate::{objects::{AlbumItem, ChunkHeader, ChunkType, DataSet, Database, JumpTable, LetterJumpEntry, Playlist, PlaylistIndexEntry, PlaylistItem, StringEntry, TrackItem}, xobjects::{XAlbumItem, XArgument, XDataSet, XDatabase, XLetterJump, XPlArgument, XPlaylist, XPlaylistIndexEntry, XSomeList, XTrackItem}};

enum ChunkState {
    Header,
    Data
}

pub fn parse_bytes(data: &[u8]) -> XDatabase {
    let mut xdb = XDatabase{data: None, header: None, children: Vec::new()};
    let mut state = ChunkState::Header;
    let mut chunk_header: Option<ChunkHeader> = None;
    let mut last_type: u32 = 0;
    let mut i = 0;
    while i < data.len() {
        state = match state {
            ChunkState::Header => {
                if i + 12 >= data.len() { break; }
                chunk_header = Some(bincode::deserialize(&data[i..i+12]).unwrap());
                i += 12;
                ChunkState::Data
            },
            ChunkState::Data => {
                let mut u = 0;
                let header = chunk_header.unwrap();
                match ChunkType::from(header.chunk_type) {
                    ChunkType::Database => {
                        info!("Db header: {:?}", header);
                        u = usize::try_from(header.end_of_chunk).unwrap() - 12;
                        let db: Database = bincode::deserialize(&data[i..i+u]).unwrap();
                        info!("val: {:?}", db);
                        xdb.data = Some(db);
                        xdb.header = Some(header);
                    },
                    ChunkType::DataSet => {
                        u = usize::try_from(header.end_of_chunk).unwrap() - 12;
                        let ds: DataSet = bincode::deserialize(&data[i..i+u]).unwrap();
                        info!("DataSet: {:?}", ds);
                        xdb.children.push(XDataSet { header: header, data: ds.clone(), child: match ds.data_type {
                            3 => XSomeList::Playlists(Vec::new()), // Playlist List
                            4 => XSomeList::AlbumList(Vec::new()), // Album List
                            _ => XSomeList::TrackList(Vec::new()) // Track List (1)
                        }});
                    },
                    ChunkType::AlbumList => {
                        info!("AlbumList");
                        u = usize::try_from(header.end_of_chunk).unwrap() - 12;
                        last_type = 4;
                    },
                    ChunkType::AlbumItem => {
                        u = usize::try_from(header.end_of_chunk).unwrap() - 12;
                        let ai: AlbumItem = bincode::deserialize(&data[i..i+u]).unwrap();
                        info!("val: {:?}", ai);
                        info!("AlbumItem: {}", u);
                        if let XSomeList::AlbumList(albums) = &mut xdb.find_dataset(4).child {
                            albums.push(XAlbumItem {header: header, data: ai,args: Vec::new()});
                        }
                    },
                    ChunkType::TrackList => {
                        info!("TrackList");
                        u = usize::try_from(header.end_of_chunk).unwrap() - 12;
                        last_type = 1;
                    },
                    ChunkType::TrackItem => {
                        u = usize::try_from(header.end_of_chunk).unwrap() - 12;
                        let ti: TrackItem = bincode::deserialize(&data[i..i+u]).unwrap();
                        info!("val: {:?}", ti);
                        if let XSomeList::TrackList(tracks) = &mut xdb.find_dataset(1).child {
                            tracks.push(XTrackItem {header: header, data: ti,args: Vec::new()});
                        }
                    },
                    ChunkType::SongReference => {
                        u = usize::try_from(header.children_count).unwrap() - 12;
                        let item: PlaylistItem = bincode::deserialize(&data[i..i+24]).unwrap();
                        info!("PlaylistItem: {:?}", item);
                    },
                    ChunkType::StringTypes => {
                        u = usize::try_from(header.children_count).unwrap() - 12;
                        let header_offset: usize = (header.end_of_chunk + 4) as usize;
                        let entry_type = u32::from_le_bytes(data[i..i+4].try_into().unwrap());
                        match entry_type {
                            0..=15 => {
                                let str_end: usize = (header.children_count - 12) as usize;
                                let entry: StringEntry = bincode::deserialize(&data[i..i+28]).unwrap();
                                info!("val: {:?}", &entry);
                                let mut bytes = Vec::new();
    
                                let mut h = i+header_offset;
                                while h < i+str_end {
                                    if data[h] != 0 {
                                        bytes.push(data[h]);
                                    }
                                    h+=1;
                                }
                                let g = String::from_utf8(bytes).unwrap();
                                info!("str: {}", g);
                                match &mut xdb.find_dataset(last_type).child {
                                    XSomeList::AlbumList(albums) => {
                                        albums.last_mut().unwrap().args.push(XArgument{ arg_type: entry_type, val: g});
                                    },
                                    XSomeList::Playlists(playlists) => {
                                        playlists.last_mut().unwrap().args.push(XPlArgument::String(XArgument{ arg_type: entry_type, val: g}));
                                    },
                                    XSomeList::TrackList(tracks) => {
                                        tracks.last_mut().unwrap().args.push(XArgument{ arg_type: entry_type, val: g});
                                    }
                                }
                            },
                            52 => {
                                let entry: PlaylistIndexEntry = bincode::deserialize(&data[i..i+60]).unwrap();
                                info!("valPl: {:?}", &entry);
                                let mut h = i+60;
                                let mut v = Vec::new();
                                while h < i+60+((4*entry.count) as usize) {
                                    v.push(u32::from_le_bytes(data[h..h+4].try_into().unwrap()));
                                    h += 4;
                                }
                                info!("Indexes: {:?}", v);
                                match &mut xdb.find_dataset(last_type).child {
                                    XSomeList::Playlists(playlists) => {
                                        playlists.last_mut().unwrap().args.push(XPlArgument::IndexEntry(XPlaylistIndexEntry{data: entry, v}));
                                    }
                                    _ => {}
                                }
                            },
                            53 => {
                                let entry: LetterJumpEntry = bincode::deserialize(&data[i..i+28]).unwrap();
                                info!("valJT: {:?}", &entry);
                                let mut h = i+28;
                                let mut v: Vec<JumpTable> = Vec::new();
                                while h < i+28+((12*entry.count) as usize) {
                                    v.push(bincode::deserialize(&data[h..h+12]).unwrap());
                                    h += 12;
                                }
                                info!("Indexes: {:?}", v);
                                match &mut xdb.find_dataset(last_type).child {
                                    XSomeList::Playlists(playlists) => {
                                        playlists.last_mut().unwrap().args.push(XPlArgument::LetterJumpEntry(XLetterJump{ data: entry, v }));
                                    }
                                    _ => {}
                                }
                            },
                            100 | 102 | 50 | 51 => {
                                info!("Entry #100,102 fetched");
                                match &mut xdb.find_dataset(last_type).child {
                                    XSomeList::Playlists(playlists) => {
                                        playlists.last_mut().unwrap().args.push(XPlArgument::RawArgument(data[i-12..i+(header.children_count as usize)-12].to_vec()));
                                    }
                                    _ => {}
                                }
                            },
                            _ => warn!("Unknown entry: {}", entry_type)
                        }
                    },
                    ChunkType::PlaylistList => {
                        info!("Playlists count: {}", header.children_count);
                        u = usize::try_from(header.end_of_chunk).unwrap() - 12;
                        last_type = 3;
                    },
                    ChunkType::Playlist => {
                        u = usize::try_from(header.end_of_chunk).unwrap() - 12;
                        let playlist: Playlist = bincode::deserialize(&data[i..i+u]).unwrap();
                        info!("playlist: {:?}", playlist);
                        if let XSomeList::Playlists(playlists) = &mut xdb.find_dataset(3).child {
                            playlists.push(XPlaylist {header: header, data: playlist,args: Vec::new()});
                        }
                    },
                    _ => { u = 1; }
                }
                i += u;
                chunk_header = None;
                ChunkState::Header
            }
        }
    }
    //let mut f = File::create("output.json").unwrap();
    //let r = f.write(serde_json::to_string::<XDatabase>(&xdb).unwrap().as_bytes());
    //info!("Result: {:?}", r);
    xdb
}