core: Made SwfSlice::to_unbounded_subslice return an empty slice in case of errors

core/src/avm1/activation.rs

@@ -861,7 +861,7 @@ impl<'a, 'gc, 'gc_context> Activation<'a, 'gc, 'gc_context> {
         parent_data: &SwfSlice,
     ) -> Result<FrameControl<'gc>, Error<'gc>> {
         let swf_version = self.swf_version();
-        let func_data = parent_data.to_unbounded_subslice(action.actions).unwrap();
+        let func_data = parent_data.to_unbounded_subslice(action.actions);
         let constant_pool = self.constant_pool();
         let func = Avm1Function::from_swf_function(
             self.context.gc_context,
@@ -2124,8 +2124,7 @@ impl<'a, 'gc, 'gc_context> Activation<'a, 'gc, 'gc_context> {
         action: &Try,
         parent_data: &SwfSlice,
     ) -> Result<FrameControl<'gc>, Error<'gc>> {
-        let mut result =
-            self.run_actions(parent_data.to_unbounded_subslice(action.try_body).unwrap());
+        let mut result = self.run_actions(parent_data.to_unbounded_subslice(action.try_body));
 
         if let Some((catch_vars, actions)) = &action.catch_body {
             if let Err(Error::ThrownValue(value)) = &result {
@@ -2151,14 +2150,13 @@ impl<'a, 'gc, 'gc_context> Activation<'a, 'gc, 'gc_context> {
                     }
                 }
 
-                result =
-                    activation.run_actions(parent_data.to_unbounded_subslice(actions).unwrap());
+                result = activation.run_actions(parent_data.to_unbounded_subslice(actions));
             }
         }
 
         if let Some(actions) = action.finally_body {
             if let ReturnType::Explicit(value) =
-                self.run_actions(parent_data.to_unbounded_subslice(actions).unwrap())?
+                self.run_actions(parent_data.to_unbounded_subslice(actions))?
             {
                 return Ok(FrameControl::Return(ReturnType::Explicit(value)));
             }
@@ -2212,7 +2210,7 @@ impl<'a, 'gc, 'gc_context> Activation<'a, 'gc, 'gc_context> {
         action: With,
         parent_data: &SwfSlice,
     ) -> Result<FrameControl<'gc>, Error<'gc>> {
-        let code = parent_data.to_unbounded_subslice(action.actions).unwrap();
+        let code = parent_data.to_unbounded_subslice(action.actions);
         let value = self.context.avm1.pop();
         match value {
             // Undefined/null with is ignored.

core/src/display_object/avm1_button.rs

@@ -46,9 +46,7 @@ impl<'gc> Avm1Button<'gc> {
     ) -> Self {
         let mut actions = vec![];
         for action in &button.actions {
-            let action_data = source_movie
-                .to_unbounded_subslice(action.action_data)
-                .unwrap();
+            let action_data = source_movie.to_unbounded_subslice(action.action_data);
             let bits = action.conditions.bits();
             let mut bit = 1u16;
             while bits & !(bit - 1) != 0 {

core/src/display_object/movie_clip.rs

@@ -3563,9 +3563,7 @@ impl ClipEventHandler {
         } else {
             ButtonKeyCode::Unknown
         };
-        let action_data = SwfSlice::from(movie)
-            .to_unbounded_subslice(other.action_data)
-            .unwrap();
+        let action_data = SwfSlice::from(movie).to_unbounded_subslice(other.action_data);
         Self {
             events: other.events,
             key_code,

core/src/display_object/video.rs

@@ -143,11 +143,7 @@ impl<'gc> Video<'gc> {
                     log::warn!("Duplicate frame {}", tag.frame_num);
                 }
 
-                if let Some(subslice) = subslice {
-                    frames.insert(tag.frame_num.into(), (subslice.start, subslice.end));
-                } else {
-                    log::warn!("Invalid bitstream subslice on frame {}", tag.frame_num);
-                }
+                frames.insert(tag.frame_num.into(), (subslice.start, subslice.end));
             }
         }
     }

core/src/tag_utils.rs

@@ -224,19 +224,19 @@ impl SwfSlice {
     ///
     /// This function allows subslices outside the current slice to be formed,
     /// as long as they are valid subslices of the movie itself.
-    pub fn to_unbounded_subslice(&self, slice: &[u8]) -> Option<Self> {
+    pub fn to_unbounded_subslice(&self, slice: &[u8]) -> Self {
         let self_pval = self.movie.data().as_ptr() as usize;
         let self_len = self.movie.data().len();
         let slice_pval = slice.as_ptr() as usize;
 
         if self_pval <= slice_pval && slice_pval < (self_pval + self_len) {
-            Some(Self {
+            Self {
                 movie: self.movie.clone(),
                 start: slice_pval - self_pval,
                 end: (slice_pval - self_pval) + slice.len(),
-            })
+            }
         } else {
-            None
+            self.copy_empty()
         }
     }