Add spawn points (#71)

Reviewed-on: #71
Co-authored-by: Álex Román Núñez <eirexe@eirteam.moe>

src/replay.rs

@@ -140,7 +140,7 @@ fn validate(replay: &Replay) -> Result<(), String> {
         ));
     }
     if replay.players_are_invalid() {
-        return Err("replay player handles must cover 0..player_count".into());
+        return Err("replay player handles must be unique".into());
     }
     if replay.frames.is_empty() {
         return Err("replay must contain at least one frame".into());
@@ -169,7 +169,16 @@ fn validate(replay: &Replay) -> Result<(), String> {
     if replay
         .frames
         .iter()
-        .any(|frame| frame.inputs.len() != replay.match_config.players.len())
+        .any(|frame| {
+            frame.inputs.len()
+                != replay
+                    .match_config
+                    .players
+                    .iter()
+                    .map(|player| player.handle)
+                    .max()
+                    .map_or(0, |handle| handle + 1)
+        })
     {
         return Err("replay frame input count does not match player count".into());
     }
@@ -185,7 +194,9 @@ impl Replay {
             .map(|player| player.handle)
             .collect();
         handles.sort_unstable();
-        handles != (0..handles.len()).collect::<Vec<_>>()
+        handles.is_empty()
+            || handles.windows(2).any(|handles| handles[0] == handles[1])
+            || handles.last() == Some(&usize::MAX)
     }
 
     fn frame(&self, frame: i32) -> Option<&ReplayFrame> {