mania: ensure columns index is valid

CHANGELOG.md

@@ -1,6 +1,7 @@
 ## Upcoming
 
 - Reduced amount of required features of `async_std` and `async_tokio`
+- Fixed a panic for some mania difficulty calculations on converts
 
 # v0.2.2
 

src/mania/mod.rs

@@ -47,6 +47,7 @@ pub fn stars(map: &Beatmap, mods: impl Mods, passed_objects: Option<usize>) -> S
     let clock_rate = mods.speed();
     let section_len = SECTION_LEN * clock_rate;
     let mut strain = Strain::new(columns);
+    let columns = columns as f32;
 
     let mut hit_objects = map
         .hit_objects
@@ -54,7 +55,7 @@ pub fn stars(map: &Beatmap, mods: impl Mods, passed_objects: Option<usize>) -> S
         .take(take)
         .skip(1)
         .zip(map.hit_objects.iter())
-        .map(|(base, prev)| DifficultyHitObject::new(base, prev, map.cs, clock_rate));
+        .map(|(base, prev)| DifficultyHitObject::new(base, prev, columns, clock_rate));
 
     // No strain for first object
     let mut current_section_end =
@@ -150,9 +151,9 @@ pub(crate) struct DifficultyHitObject<'o> {
 
 impl<'o> DifficultyHitObject<'o> {
     #[inline]
-    fn new(base: &'o HitObject, prev: &'o HitObject, cs: f32, clock_rate: f32) -> Self {
+    fn new(base: &'o HitObject, prev: &'o HitObject, columns: f32, clock_rate: f32) -> Self {
-        let x_divisor = 512.0 / cs;
+        let x_divisor = 512.0 / columns;
-        let column = (base.pos.x / x_divisor).floor() as usize;
+        let column = (base.pos.x / x_divisor).floor().min(columns - 1.0) as usize;
 
         Self {
             base,

src/mania/strain.rs

@@ -77,7 +77,7 @@ impl Strain {
         let mut hold_addition = 0.0;
 
         for col in 0..self.hold_end_times.len() {
-            let hold_end_time = self.hold_end_times[col as usize];
+            let hold_end_time = self.hold_end_times[col];
 
             if end_time > hold_end_time + 1.0 {
                 if hold_end_time > current.base.start_time + 1.0 {

src/parse/error.rs

@@ -64,7 +64,7 @@ impl fmt::Display for ParseError {
             )))]
             Self::UnincludedMode(mode) => write!(
                 f,
-                "cannot process {:?} map its mode's feature has not been included",
+                "cannot process {:?} map; its mode's feature has not been included",
                 mode
             ),
         }