Updater: Don't show thousands of days

* When pausing and resuming, the ETA calculation is off by a lot
  due to the time diff since the last calculation resulting in a
  big delta and therefore a very low speed
* By fixing this, we also need to set the last byte count to the total
  byte count there, otherwise the downloaded bytes since last calculation
  will be larger than in reality, resulting in too fast speeds calculated

Change-Id: Ica1053cc297ff59221ea2bc0014f20973a080c88

src/org/lineageos/updater/download/HttpURLConnectionClient.java

@@ -140,8 +140,20 @@ public class HttpURLConnectionClient implements DownloadClient {
             mResume = resume;
         }
 
-        private void calculateSpeed() {
+        private void calculateSpeed(boolean justResumed) {
             final long millis = SystemClock.elapsedRealtime();
+            if (justResumed) {
+                // If we don't start over with these after resumption, we get huge numbers for
+                // ETA since the delta will grow, resulting in a very low speed
+                mLastMillis = millis;
+                mSpeed = -1; // we don't want the moving avg with values from who knows when
+
+                // need to do this as well, otherwise the second time we call calculateSpeed(),
+                // the difference (mTotalBytesRead - mCurSampleBytes) will be larger than expected,
+                // resulting in a higher speed calculation
+                mCurSampleBytes = mTotalBytesRead;
+                return;
+            }
             final long delta = millis - mLastMillis;
             if (delta > 500) {
                 final long curSpeed = ((mTotalBytesRead - mCurSampleBytes) * 1000) / delta;
@@ -243,6 +255,7 @@ public class HttpURLConnectionClient implements DownloadClient {
 
         @Override
         public void run() {
+            boolean justResumed = false;
             try {
                 mClient.setInstanceFollowRedirects(!mUseDuplicateLinks);
                 mClient.connect();
@@ -256,6 +269,7 @@ public class HttpURLConnectionClient implements DownloadClient {
                 mCallback.onResponse(new Headers());
 
                 if (mResume && isPartialContentCode(responseCode)) {
+                    justResumed = true;
                     mTotalBytesRead = mDestination.length();
                     Log.d(TAG, "The server fulfilled the partial content request");
                 } else if (mResume || !isSuccessCode(responseCode)) {
@@ -274,8 +288,9 @@ public class HttpURLConnectionClient implements DownloadClient {
                     while (!isInterrupted() && (count = inputStream.read(b)) > 0) {
                         outputStream.write(b, 0, count);
                         mTotalBytesRead += count;
-                        calculateSpeed();
+                        calculateSpeed(justResumed);
                         calculateEta();
+                        justResumed = false; // otherwise we will never get speed and ETA again
                         if (mProgressListener != null) {
                             mProgressListener.update(mTotalBytesRead, mTotalBytes, mSpeed, mEta);
                         }