polytrack_codes/v3/
mod.rs

1#![allow(clippy::cast_possible_truncation, clippy::cast_sign_loss)]
2#[cfg(test)]
3mod tests;
4
5use crate::tools::{self, Track, hash_vec, read::*};
6
7pub const CP_IDS: [u8; 4] = [52, 65, 75, 77];
8
9#[derive(Debug, PartialEq, Eq)]
10pub struct TrackInfo {
11    pub parts: Vec<Part>,
12}
13
14#[derive(Debug, PartialEq, Eq)]
15pub struct Part {
16    pub id: u8,
17    pub amount: u32,
18    pub blocks: Vec<Block>,
19}
20
21#[derive(Debug, PartialEq, Eq)]
22pub struct Block {
23    pub x: i32,
24    pub y: i32,
25    pub z: i32,
26
27    pub rotation: u8,
28    pub cp_order: Option<u16>,
29}
30
31#[must_use]
32pub fn decode_track_code(track_code: &str) -> Option<Track> {
33    let track_code = track_code.get(2..)?;
34    let metadata = tools::decode(track_code.get(..2)?)?;
35    let name_len_step1 = *metadata.first()? as usize;
36    let name_len = (name_len_step1 * 4).div_ceil(3);
37    let track_name_raw = tools::decode(track_code.get(2..2 + name_len)?)?;
38    let name = String::from_utf8(track_name_raw).ok()?;
39    let track_data = tools::decompress(&tools::decode(track_code.get(2 + name_len..)?)?)?;
40    Some(Track {
41        name,
42        author: None,
43        track_data,
44    })
45}
46
47#[must_use]
48pub fn decode_track_data(data: &[u8]) -> Option<TrackInfo> {
49    let mut offset = 0;
50    let mut parts = Vec::new();
51    while offset < data.len() {
52        let id = read_u16(data, &mut offset)? as u8;
53        let amount = read_u32(data, &mut offset)?;
54
55        let mut blocks = Vec::new();
56        for _ in 0..amount {
57            let x = read_i24(data, &mut offset)? - i32::pow(2, 23);
58            let y = read_i24(data, &mut offset)?;
59            let z = read_i24(data, &mut offset)? - i32::pow(2, 23);
60
61            let rotation = read_u8(data, &mut offset)? & 3;
62
63            let cp_order = if CP_IDS.contains(&id) {
64                Some(read_u16(data, &mut offset)?)
65            } else {
66                None
67            };
68            blocks.push(Block {
69                x,
70                y,
71                z,
72                rotation,
73                cp_order,
74            });
75        }
76        parts.push(Part { id, amount, blocks });
77    }
78
79    Some(TrackInfo { parts })
80}
81
82#[must_use]
83pub fn export_to_id(track_code: &str) -> Option<String> {
84    let track_data = decode_track_code(track_code)?;
85    let data = track_data.track_data;
86    let id = hash_vec(data);
87    Some(id)
88}
polytrack_codes/v3/mod.rs

polytrack_codes/v3/
mod.rs
