avm2: `bytesLoaded` etc reports the compressed file length, not the uncompressed length

core/src/avm2/globals/flash/display/loaderinfo.rs

@@ -94,7 +94,7 @@ pub fn bytes_total<'gc>(
         if let Some(loader_stream) = this.as_loader_stream() {
             match &*loader_stream {
                 LoaderStream::SWF(movie, _) => {
-                    return Ok(movie.data().len().into());
+                    return Ok(movie.compressed_length().into());
                 }
             }
         }

core/src/tag_utils.rs

@@ -28,6 +28,9 @@ pub struct SwfMovie {
 
     /// The suggest encoding for this SWF.
     encoding: &'static swf::Encoding,
+
+    /// The compressed length of the entire datastream
+    compressed_length: usize,
 }
 
 impl SwfMovie {
@@ -46,6 +49,7 @@ impl SwfMovie {
             url: None,
             parameters: PropertyMap::new(),
             encoding: swf::UTF_8,
+            compressed_length: 0,
         }
     }
 
@@ -61,6 +65,7 @@ impl SwfMovie {
             url: source.url.clone(),
             parameters: source.parameters.clone(),
             encoding: source.encoding,
+            compressed_length: source.compressed_length,
         }
     }
 
@@ -78,6 +83,7 @@ impl SwfMovie {
 
     /// Construct a movie based on the contents of the SWF datastream.
     pub fn from_data(swf_data: &[u8], url: Option<String>) -> Result<Self, Error> {
+        let compressed_length = swf_data.len();
         let swf_buf = swf::read::decompress_swf(swf_data)?;
         let encoding = swf::SwfStr::encoding_for_version(swf_buf.header.version);
         Ok(Self {
@@ -86,6 +92,7 @@ impl SwfMovie {
             url,
             parameters: PropertyMap::new(),
             encoding,
+            compressed_length,
         })
     }
 
@@ -130,6 +137,10 @@ impl SwfMovie {
     pub fn parameters_mut(&mut self) -> &mut PropertyMap<String> {
         &mut self.parameters
     }
+
+    pub fn compressed_length(&self) -> usize {
+        self.compressed_length
+    }
 }
 
 /// A shared-ownership reference to some portion of an SWF datastream.