Fix[downloader]: downloader improvement fixes

- improve docs, fix types
- increase speed calculator default queue depth
- reenable usage of size counter by default (whoops)

app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/mirrors/DownloadMirror.java

@@ -43,7 +43,7 @@ public static void downloadFileMirrored(int downloadClass, String urlInput, File
             return;
         }catch (FileNotFoundException e) {
             Log.w("DownloadMirror", "Cannot find the file on the mirror", e);
-            Log.i("DownloadMirror", "Failling back to default source");
+            Log.i("DownloadMirror", "Falling back to default source");
         }
         DownloadUtils.downloadFileMonitored(urlInput, outputFile, buffer, monitor);
     }
@@ -63,24 +63,24 @@ public static void downloadFileMirrored(int downloadClass, String urlInput, File
             return;
         }catch (FileNotFoundException e) {
             Log.w("DownloadMirror", "Cannot find the file on the mirror", e);
-            Log.i("DownloadMirror", "Failling back to default source");
+            Log.i("DownloadMirror", "Falling back to default source");
         }
         DownloadUtils.downloadFile(urlInput, outputFile);
     }
 
     /**
-     * Getht he content length of a file on the current mirror. If the file is missing on the mirror,
+     * Get the content length of a file on the current mirror. If the file is missing on the mirror,
      * or the mirror does not give out the length, request the length from the original source
      * @param downloadClass Class of the download. Can either be DOWNLOAD_CLASS_LIBRARIES,
      *                      DOWNLOAD_CLASS_METADATA or DOWNLOAD_CLASS_ASSETS
      * @param urlInput The original (Mojang) URL for the download
-     * @return the length of the file denoted by the URL
+     * @return the length of the file denoted by the URL in bytes, or -1 if not available
      */
     public static long getContentLengthMirrored(int downloadClass, String urlInput) throws IOException {
         long length = DownloadUtils.getContentLength(getMirrorMapping(downloadClass, urlInput));
         if(length < 1) {
             Log.w("DownloadMirror", "Unable to get content length from mirror");
-            Log.i("DownloadMirror", "Failling back to default source");
+            Log.i("DownloadMirror", "Falling back to default source");
             return DownloadUtils.getContentLength(urlInput);
         }else {
             return length;

app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/tasks/MinecraftDownloader.java

@@ -92,7 +92,7 @@ private void downloadGame(Activity activity, JMinecraftVersionList.Version verIn
         mProcessedSizeCounter = new AtomicLong(0);
         mInternetUsageCounter = new AtomicLong(0);
         mDownloaderThreadException = new AtomicReference<>(null);
-        mUseFileCounter = true;
+        mUseFileCounter = false;
 
         if(!downloadAndProcessMetadata(activity, verInfo, versionName)) {
             throw new RuntimeException(activity.getString(R.string.exception_failed_to_unpack_jre17));

app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/tasks/SpeedCalculator.java

@@ -11,7 +11,7 @@ public class SpeedCalculator {
     private double mSum;
 
     public SpeedCalculator() {
-        this(4);
+        this(64);
     }
 
     public SpeedCalculator(int averageDepth) {
@@ -27,13 +27,18 @@ private double addToAverage(double speed) {
         return (mSum + (dLength / 2d)) / dLength;
     }
 
-    public double feed(long newBytes) {
+    /**
+     * Update the current amount of bytes downloaded.
+     * @param bytes the new amount of bytes downloaded
+     * @return the current download speed in bytes per second
+     */
+    public double feed(long bytes) {
         long millis = System.currentTimeMillis();
-        long deltaBytes = newBytes - mLastBytes;
+        long deltaBytes = bytes - mLastBytes;
         long deltaMillis = millis - mLastMillis;
-        mLastBytes = deltaBytes;
+        mLastBytes = bytes;
         mLastMillis = millis;
-        double speed = (double)deltaBytes / (double)deltaMillis;
+        double speed = (double)deltaBytes / ((double)deltaMillis / 1000d);
         return addToAverage(speed);
     }
 }