Fix importing blacklist files larger than 4000 bytes

CHANGELOG.md

@@ -7,6 +7,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## [Unreleased]
 
+### Fixed
+
+- Fixed importing blacklist files larger than 4000 bytes.
+
 
 ## [0.5.9] - 2020-10-20
 

app/src/main/java/dummydomain/yetanothercallblocker/data/BlacklistImporterExporter.java

@@ -120,7 +120,9 @@ public class BlacklistImporterExporter {
         List<BlacklistItem> items = null;
 
         try (BufferedInputStream bis = new BufferedInputStream(inputStream)) {
-            bis.mark(4000);
+            // BufferedReaders used in `isYacbBackup` and `isNoPhoneSpamBackup` use 8192 char buffers,
+            // the max size of a UTF-8 char is 4 bytes.
+            bis.mark(8192 * 4);
 
             if (isYacbBackup(new InputStreamReader(bis))) {
                 bis.reset();