Make unsuported charsets explicit, add freeutils charsets

README.md

@@ -99,6 +99,7 @@ FairEmail uses:
 
 * [JavaMail](https://javaee.github.io/javamail/). Copyright (c) 1997-2018 Oracle® and/or its affiliates. All rights reserved. [GPLv2+CE license](https://javaee.github.io/javamail/JavaMail-License).
 * [jsoup](https://jsoup.org/). Copyright © 2009 - 2017 Jonathan Hedley. [MIT license](https://jsoup.org/license).
+* [JCharset](http://www.freeutils.net/source/jcharset/). Copyright © 2005-2015 Amichai Rothman. [GNU General Public License](http://www.freeutils.net/source/jcharset/#license)
 * [Android Support Library](https://developer.android.com/tools/support-library/). Copyright (C) 2011 The Android Open Source Project. [Apache license](https://android.googlesource.com/platform/frameworks/support/+/master/LICENSE.txt).
 * [Android Architecture Components](https://developer.android.com/topic/libraries/architecture/). Copyright 2018 The Android Open Source Project, Inc. [Apache license](https://github.com/googlesamples/android-architecture-components/blob/master/LICENSE).
 

app/build.gradle

@@ -74,4 +74,6 @@ dependencies {
     // https://jsoup.org/
     implementation "org.jsoup:jsoup:$jsoup_version"
 
+    // http://www.freeutils.net/source/jcharset/
+    implementation "net.freeutils:jcharset:2.0"
 }

app/src/main/java/eu/faircode/email/MessageHelper.java

@@ -253,9 +253,9 @@ public class MessageHelper {
                 try {
                     s = part.getContent().toString();
                 } catch (UnsupportedEncodingException ex) {
-                    Log.w(Helper.TAG, part.getContentType() + "\n" + ex + "\n" + Log.getStackTraceString(ex));
-                    s = "Unsupported encoding: " + part.getContentType() + "\n\n";
-
+                    throw new UnsupportedEncodingException(part.getContentType());
+/*
+                    // https://javaee.github.io/javamail/FAQ#unsupen
                     InputStream is = part.getInputStream();
 
                     ByteArrayOutputStream os = new ByteArrayOutputStream();
@@ -269,6 +269,7 @@ public class MessageHelper {
                     } catch (UnsupportedEncodingException uex) {
                         Log.w(Helper.TAG, uex + "\n" + Log.getStackTraceString(uex));
                     }
+*/
                 }
 
                 if (part.isMimeType("text/plain"))