Fix wrong downloaded percentage when server doesn't send content length. Fixes #1019

app/src/main/java/eu/kanade/tachiyomi/source/model/Page.kt

@@ -28,7 +28,11 @@ class Page(
     @Transient private var statusSubject: Subject<Int, Int>? = null
 
     override fun update(bytesRead: Long, contentLength: Long, done: Boolean) {
-        progress = (100 * bytesRead / contentLength).toInt()
+        progress = if (contentLength > 0) {
+            (100 * bytesRead / contentLength).toInt()
+        } else {
+            -1
+        }
     }
 
     fun setStatusSubject(subject: Subject<Int, Int>?) {

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/pager/PageView.kt

@@ -130,7 +130,11 @@ class PageView @JvmOverloads constructor(context: Context, attrs: AttributeSet?
                 .onBackpressureLatest()
                 .observeOn(AndroidSchedulers.mainThread())
                 .subscribe { progress ->
-                    progress_text.text = context.getString(R.string.download_progress, progress)
+                    progress_text.text = if (progress > 0) {
+                        context.getString(R.string.download_progress, progress)
+                    } else {
+                        context.getString(R.string.downloading)
+                    }
                 }
     }
 

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/webtoon/WebtoonHolder.kt

@@ -150,7 +150,11 @@ class WebtoonHolder(private val view: View, private val adapter: WebtoonAdapter)
                 .onBackpressureLatest()
                 .observeOn(AndroidSchedulers.mainThread())
                 .subscribe { progress ->
-                    view.progress_text.text = view.context.getString(R.string.download_progress, progress)
+                    view.progress_text.text = if (progress > 0) {
+                        view.context.getString(R.string.download_progress, progress)
+                    } else {
+                        view.context.getString(R.string.downloading)
+                    }
                 }
 
         addSubscription(progressSubscription)