Jsoup parse from file to reduce memory usage

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

@@ -1690,18 +1690,19 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
                     if (!file.exists())
                         return null;
 
-                    String body = Helper.readText(file);
-                    if (!TextUtils.isEmpty(body))
+                    if (file.length() > 0)
                         signed_data = false;
                     args.putBoolean("signed_data", signed_data);
 
-                    Document document = JsoupEx.parse(body);
+                    Document document = JsoupEx.parse(file);
                     HtmlHelper.cleanup(document);
 
                     // Check for inline encryption
-                    int begin = body.indexOf(Helper.PGP_BEGIN_MESSAGE);
-                    int end = body.indexOf(Helper.PGP_END_MESSAGE);
-                    args.putBoolean("inline_encrypted", begin >= 0 && begin < end);
+                    boolean iencrypted = HtmlHelper.contains(document, new String[]{
+                            Helper.PGP_BEGIN_MESSAGE,
+                            Helper.PGP_END_MESSAGE
+                    });
+                    args.putBoolean("inline_encrypted", iencrypted);
 
                     // Check for images
                     boolean has_images = false;
@@ -1752,7 +1753,7 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
                             HtmlHelper.removeTrackingPixels(context, document);
 
                         if (debug) {
-                            Document format = JsoupEx.parse(document.html());
+                            Document format = JsoupEx.parse(file);
                             format.outputSettings().prettyPrint(true).outline(true).indentAmount(1);
                             Element pre = document.createElement("pre");
                             pre.text(format.html());

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

@@ -3078,8 +3078,7 @@ public class FragmentCompose extends FragmentBase {
                             div.appendChild(p);
 
                             // Get referenced message body
-                            String rhtml = Helper.readText(ref.getFile(context));
-                            Document d = JsoupEx.parse(rhtml);
+                            Document d = JsoupEx.parse(ref.getFile(context));
 
                             // Remove signature separators
                             boolean remove_signatures = prefs.getBoolean("remove_signatures", false);

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

@@ -5801,8 +5801,7 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
                 if (!file.exists())
                     return null;
 
-                String html = Helper.readText(file);
-                Document document = JsoupEx.parse(html);
+                Document document = JsoupEx.parse(file);
                 HtmlHelper.truncate(document, false);
                 HtmlHelper.embedInlineImages(context, id, document);
 

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

@@ -64,6 +64,7 @@ import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Locale;
+import java.util.Map;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -1249,6 +1250,36 @@ public class HtmlHelper {
         return (length >= max);
     }
 
+    static boolean contains(Document d, String[] texts) {
+        Map<String, Boolean> condition = new HashMap<>();
+        for (String t : texts)
+            condition.put(t, false);
+
+        for (Element elm : d.select("*"))
+            for (Node child : elm.childNodes()) {
+                if (child instanceof TextNode) {
+                    TextNode tnode = ((TextNode) child);
+                    String text = tnode.getWholeText();
+                    for (String t : texts)
+                        if (!condition.get(t) && text.contains(t)) {
+                            condition.put(t, true);
+
+                            boolean found = true;
+                            for (String c : texts)
+                                if (!condition.get(c)) {
+                                    found = false;
+                                    break;
+                                }
+
+                            if (found)
+                                return true;
+                        }
+                }
+            }
+
+        return false;
+    }
+
     static Spanned fromHtml(@NonNull String html) {
         return fromHtml(html, null, null);
     }

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

@@ -23,6 +23,10 @@ import org.jsoup.Jsoup;
 import org.jsoup.nodes.Document;
 import org.jsoup.nodes.Element;
 
+import java.io.File;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+
 public class JsoupEx {
     static Document parse(String html) {
 
@@ -47,4 +51,8 @@ org.jsoup.UncheckedIOException: java.io.IOException: Input is binary and unsuppo
             return document;
         }
     }
+
+    static Document parse(File in) throws IOException {
+        return Jsoup.parse(in, StandardCharsets.UTF_8.name());
+    }
 }

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

@@ -484,8 +484,7 @@ public class MessageHelper {
         }
 
         // Build html body
-        String html = Helper.readText(message.getFile(context));
-        Document document = JsoupEx.parse(html);
+        Document document = JsoupEx.parse(message.getFile(context));
 
         // When sending message
         if (identity != null)