Export data images

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

@@ -39,6 +39,7 @@ import android.content.SharedPreferences;
 import android.content.pm.PackageManager;
 import android.content.res.ColorStateList;
 import android.database.Cursor;
+import android.graphics.Bitmap;
 import android.graphics.Color;
 import android.graphics.Paint;
 import android.graphics.Rect;
@@ -144,8 +145,11 @@ import com.google.android.material.snackbar.Snackbar;
 import org.jsoup.nodes.Document;
 import org.jsoup.nodes.Element;
 
+import java.io.BufferedOutputStream;
 import java.io.File;
+import java.io.FileOutputStream;
 import java.io.IOException;
+import java.io.OutputStream;
 import java.io.UnsupportedEncodingException;
 import java.lang.reflect.Field;
 import java.nio.charset.StandardCharsets;
@@ -3887,7 +3891,36 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
                 }.execute(context, owner, args, "view:cid");
             } else if ("http".equals(scheme) || "https".equals(scheme))
                 Helper.view(context, uri, false);
-            else {
+            else if ("data".equals(scheme)) {
+                new SimpleTask<File>() {
+                    @Override
+                    protected File onExecute(Context context, Bundle args) throws IOException {
+                        long id = args.getLong("id");
+                        String source = args.getString("source");
+
+                        Bitmap bm = ImageHelper.getDataBitmap(source);
+                        if (bm == null)
+                            return null;
+
+                        File file = ImageHelper.getCacheFile(context, id, source);
+                        try (OutputStream os = new BufferedOutputStream(new FileOutputStream(file))) {
+                            bm.compress(Bitmap.CompressFormat.PNG, 90, os);
+                        }
+
+                        return file;
+                    }
+
+                    @Override
+                    protected void onExecuted(Bundle args, File file) {
+                        Helper.share(context, file, "image/png", file.getName());
+                    }
+
+                    @Override
+                    protected void onException(Bundle args, Throwable ex) {
+                        Log.unexpectedError(parentFragment.getParentFragmentManager(), ex);
+                    }
+                }.execute(context, owner, args, "view:cid");
+            } else {
                 FragmentDialogImage fragment = new FragmentDialogImage();
                 fragment.setArguments(args);
                 fragment.show(parentFragment.getParentFragmentManager(), "view:image");

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

@@ -302,7 +302,15 @@ class ImageHelper {
             // Data URI
             if (data && (show || inline || a.tracking))
                 try {
-                    Drawable d = getDataDrawable(context, a.source);
+                    Bitmap bm = getDataBitmap(source);
+                    if (bm == null)
+                        throw new IllegalArgumentException("decode byte array failed");
+
+                    Drawable d = new BitmapDrawable(context.getResources(), bm);
+
+                    DisplayMetrics dm = context.getResources().getDisplayMetrics();
+                    d.setBounds(0, 0, Math.round(bm.getWidth() * dm.density), Math.round(bm.getHeight() * dm.density));
+
                     if (view != null)
                         fitDrawable(d, a, view);
                     return d;
@@ -505,7 +513,7 @@ class ImageHelper {
         }
     }
 
-    private static Drawable getDataDrawable(Context context, String source) {
+    static Bitmap getDataBitmap(String source) {
         // "<img src=\"data:image/png;base64,iVBORw0KGgoAAA" +
         // "ANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4" +
         // "//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU" +
@@ -514,16 +522,7 @@ class ImageHelper {
         String base64 = source.substring(source.indexOf(',') + 1);
         byte[] bytes = Base64.decode(base64.getBytes(), 0);
 
-        Bitmap bm = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
-        if (bm == null)
-            throw new IllegalArgumentException("decode byte array failed");
-
-        Drawable d = new BitmapDrawable(context.getResources(), bm);
-
-        DisplayMetrics dm = context.getResources().getDisplayMetrics();
-        d.setBounds(0, 0, Math.round(bm.getWidth() * dm.density), Math.round(bm.getHeight() * dm.density));
-
-        return d;
+        return BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
     }
 
     private static Drawable getCachedImage(Context context, long id, String source) {
@@ -652,7 +651,7 @@ class ImageHelper {
     }
 
     @NonNull
-    private static File getCacheFile(Context context, long id, String source) {
+    static File getCacheFile(Context context, long id, String source) {
         File dir = new File(context.getCacheDir(), "images");
         if (!dir.exists())
             dir.mkdir();

app/src/main/res/xml/fileprovider_paths.xml

@@ -15,4 +15,7 @@
     <cache-path
         name="shared"
         path="shared" />
+    <cache-path
+        name="images"
+        path="images" />
 </paths>