core: `NetStream` should be a self-owning pointer type.

core/src/avm1/globals/netstream.rs

@@ -30,7 +30,7 @@ fn get_bytes_loaded<'gc>(
     _args: &[Value<'gc>],
 ) -> Result<Value<'gc>, Error<'gc>> {
     if let NativeObject::NetStream(ns) = this.native() {
-        return Ok(ns.read().bytes_loaded().into());
+        return Ok(ns.bytes_loaded().into());
     }
 
     Ok(Value::Undefined)
@@ -42,7 +42,7 @@ fn get_bytes_total<'gc>(
     _args: &[Value<'gc>],
 ) -> Result<Value<'gc>, Error<'gc>> {
     if let NativeObject::NetStream(ns) = this.native() {
-        return Ok(ns.read().bytes_total().into());
+        return Ok(ns.bytes_loaded().into());
     }
 
     Ok(Value::Undefined)

core/src/avm1/object.rs

@@ -60,7 +60,7 @@ pub enum NativeObject<'gc> {
     BevelFilter(GcCell<'gc, BevelFilterObject>),
     ColorTransform(GcCell<'gc, ColorTransformObject>),
     TextFormat(GcCell<'gc, TextFormat>),
-    NetStream(GcCell<'gc, NetStream>),
+    NetStream(NetStream<'gc>),
 }
 
 /// Represents an object that can be directly interacted with by the AVM

core/src/avm2/globals/flash/net/net_stream.rs

@@ -8,7 +8,7 @@ pub fn get_bytes_loaded<'gc>(
     _args: &[Value<'gc>],
 ) -> Result<Value<'gc>, Error<'gc>> {
     if let Some(ns) = this.and_then(|o| o.as_netstream()) {
-        return Ok(ns.read().bytes_loaded().into());
+        return Ok(ns.bytes_loaded().into());
     }
 
     Ok(Value::Undefined)
@@ -20,7 +20,7 @@ pub fn get_bytes_total<'gc>(
     _args: &[Value<'gc>],
 ) -> Result<Value<'gc>, Error<'gc>> {
     if let Some(ns) = this.and_then(|o| o.as_netstream()) {
-        return Ok(ns.read().bytes_total().into());
+        return Ok(ns.bytes_total().into());
     }
 
     Ok(Value::Undefined)

core/src/avm2/object.rs

@@ -1298,7 +1298,7 @@ pub trait TObject<'gc>: 'gc + Collect + Debug + Into<Object<'gc>> + Clone + Copy
         None
     }
 
-    fn as_netstream(self) -> Option<GcCell<'gc, NetStream>> {
+    fn as_netstream(self) -> Option<NetStream<'gc>> {
         None
     }
 }

core/src/avm2/object/netstream_object.rs

@@ -34,7 +34,7 @@ pub struct NetStreamObject<'gc>(GcCell<'gc, NetStreamObjectData<'gc>>);
 #[collect(no_drop)]
 pub struct NetStreamObjectData<'gc> {
     base: ScriptObjectData<'gc>,
-    ns: GcCell<'gc, NetStream>,
+    ns: NetStream<'gc>,
 }
 
 impl<'gc> TObject<'gc> for NetStreamObject<'gc> {
@@ -54,7 +54,7 @@ impl<'gc> TObject<'gc> for NetStreamObject<'gc> {
         Ok(Value::Object((*self).into()))
     }
 
-    fn as_netstream(self) -> Option<GcCell<'gc, NetStream>> {
+    fn as_netstream(self) -> Option<NetStream<'gc>> {
         Some(self.0.read().ns)
     }
 }

core/src/display_object/video.rs

@@ -107,7 +107,7 @@ pub enum VideoSource<'gc> {
         movie: Arc<SwfMovie>,
 
         /// The stream the video is downloaded from.
-        stream: GcCell<'gc, NetStream>,
+        stream: NetStream<'gc>,
 
         /// The number of frames in the source media, if known.
         num_frames: Option<usize>,
@@ -150,11 +150,7 @@ impl<'gc> Video<'gc> {
     /// Convert this Video into a NetStream sourced video.
     ///
     /// Existing video state related to the old video stream will be dropped.
-    pub fn attach_netstream(
-        self,
-        context: &mut UpdateContext<'_, 'gc>,
-        stream: GcCell<'gc, NetStream>,
-    ) {
+    pub fn attach_netstream(self, context: &mut UpdateContext<'_, 'gc>, stream: NetStream<'gc>) {
         let movie = self.movie();
         let mut video = self.0.write(context.gc_context);
 

core/src/loader.rs

@@ -27,7 +27,7 @@ use crate::string::AvmString;
 use crate::tag_utils::SwfMovie;
 use crate::vminterface::Instantiator;
 use encoding_rs::UTF_8;
-use gc_arena::{Collect, CollectionContext, GcCell};
+use gc_arena::{Collect, CollectionContext};
 use generational_arena::{Arena, Index};
 use ruffle_render::utils::{determine_jpeg_tag_format, JpegTagFormat};
 use std::fmt;
@@ -412,7 +412,7 @@ impl<'gc> LoadManager<'gc> {
     pub fn load_netstream(
         &mut self,
         player: Weak<Mutex<Player>>,
-        target_stream: GcCell<'gc, NetStream>,
+        target_stream: NetStream<'gc>,
         request: Request,
     ) -> OwnedFuture<(), Error> {
         let loader = Loader::NetStream {
@@ -589,7 +589,7 @@ pub enum Loader<'gc> {
         self_handle: Option<Handle>,
 
         /// The stream to buffer data into.
-        target_stream: GcCell<'gc, NetStream>,
+        target_stream: NetStream<'gc>,
     },
 }
 
@@ -1368,10 +1368,10 @@ impl<'gc> Loader<'gc> {
 
                 match response {
                     Ok(mut response) => {
-                        stream.write(uc.gc_context).load_buffer(&mut response.body);
+                        stream.load_buffer(uc.gc_context, &mut response.body);
                     }
                     Err(err) => {
-                        stream.write(uc.gc_context).report_error(err);
+                        stream.report_error(err);
                     }
                 }
 

core/src/streams.rs

@@ -16,7 +16,7 @@ pub struct StreamManager<'gc> {
     ///
     /// This is not the total list of all created NetStreams; only the ones
     /// that have been configured to play media.
-    playing_streams: Vec<GcCell<'gc, NetStream>>,
+    playing_streams: Vec<NetStream<'gc>>,
 }
 
 impl<'gc> Default for StreamManager<'gc> {
@@ -56,31 +56,38 @@ impl<'gc> StreamManager<'gc> {
 ///
 /// It corresponds directly to the AVM1 and AVM2 `NetStream` classes; it's API
 /// is intended to be a VM-agnostic version of those.
+#[derive(Clone, Debug, Collect, Copy)]
+#[collect(no_drop)]
+pub struct NetStream<'gc>(GcCell<'gc, NetStreamData>);
+
 #[derive(Clone, Debug, Collect)]
 #[collect(require_static)]
-pub struct NetStream {
+pub struct NetStreamData {
     /// All data currently loaded in the stream.
     buffer: Vec<u8>,
 }
 
-impl NetStream {
-    pub fn new<'gc>(gc_context: MutationContext<'gc, '_>) -> GcCell<'gc, Self> {
-        GcCell::allocate(gc_context, NetStream { buffer: Vec::new() })
+impl<'gc> NetStream<'gc> {
+    pub fn new(gc_context: MutationContext<'gc, '_>) -> Self {
+        Self(GcCell::allocate(
+            gc_context,
+            NetStreamData { buffer: Vec::new() },
+        ))
     }
 
-    pub fn load_buffer(&mut self, data: &mut Vec<u8>) {
-        self.buffer.append(data);
+    pub fn load_buffer(self, gc_context: MutationContext<'gc, '_>, data: &mut Vec<u8>) {
+        self.0.write(gc_context).buffer.append(data);
     }
 
-    pub fn report_error(&mut self, _error: Error) {
+    pub fn report_error(self, _error: Error) {
         //TODO: Report an `asyncError` to AVM1 or 2.
     }
 
-    pub fn bytes_loaded(&self) -> usize {
-        self.buffer.len()
+    pub fn bytes_loaded(self) -> usize {
+        self.0.read().buffer.len()
     }
 
-    pub fn bytes_total(&self) -> usize {
-        self.buffer.len()
+    pub fn bytes_total(self) -> usize {
+        self.0.read().buffer.len()
     }
 }