[FM] Load J2ME jar icons

Signed-off-by: Muntashir Al-Islam <[email protected]>
MuntashirAkon · Nov 17, 2024 · bb1d01e · bb1d01e
1 parent e42e885
commit bb1d01e
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Showing 3 changed files with 99 additions and 0 deletions.
diff --git a/app/src/main/java/io/github/muntashirakon/AppManager/fm/icons/FmIconFetcher.java b/app/src/main/java/io/github/muntashirakon/AppManager/fm/icons/FmIconFetcher.java
@@ -102,6 +102,14 @@ public ImageLoader.ImageFetcherResult fetchImage(@NonNull String tag) {
                             false, true, defaultImage);
                 }
             }
+        } else if (FmIcons.isArchive(drawableRes)) {
+            if (ContentType.JAVA_ARCHIVE.getMimeType().equals(mimeType)) {
+                Bitmap bitmap = FmIcons.generateJ2meIcon(mFmItem.path);
+                if (bitmap != null) {
+                    return new ImageLoader.ImageFetcherResult(tag, getThumbnail(bitmap, size, true),
+                            false, true, defaultImage);
+                }
+            }
         } else if (FmIcons.isAudio(drawableRes)) {
             try {
                 Bitmap bitmap = ThumbnailUtilsCompat.createAudioThumbnail(ContextUtils.getContext(), FmProvider.getContentUri(mFmItem.path), size, null);

diff --git a/app/src/main/java/io/github/muntashirakon/AppManager/fm/icons/FmIcons.java b/app/src/main/java/io/github/muntashirakon/AppManager/fm/icons/FmIcons.java
@@ -275,6 +275,10 @@ public static boolean isApk(@DrawableRes int drawable) {
         return drawable == DRAWABLE_APK;
     }
 
+    public static boolean isArchive(@DrawableRes int drawable) {
+        return drawable == DRAWABLE_ARCHIVE;
+    }
+
     public static boolean isImage(@DrawableRes int drawable) {
         return drawable == DRAWABLE_IMAGE;
     }
@@ -368,6 +372,21 @@ public static Bitmap generateEpubCover(@NonNull Path path) {
         }
     }
 
+    @Nullable
+    public static Bitmap generateJ2meIcon(@NonNull Path path) {
+        Pair<File, Boolean> file = getUsableFile(path);
+        if (file == null) {
+            return null;
+        }
+        try {
+            return J2meIconExtractor.generateFromFile(file.first);
+        } finally {
+            if (file.second) {
+                file.first.delete();
+            }
+        }
+    }
+
     @Nullable
     public static Bitmap getOpenDocumentThumbnail(@NonNull Path path) {
         Pair<File, Boolean> file = getUsableFile(path);

diff --git a/app/src/main/java/io/github/muntashirakon/AppManager/fm/icons/J2meIconExtractor.java b/app/src/main/java/io/github/muntashirakon/AppManager/fm/icons/J2meIconExtractor.java
@@ -0,0 +1,72 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package io.github.muntashirakon.AppManager.fm.icons;
+
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.jar.Attributes;
+import java.util.jar.Manifest;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipFile;
+
+class J2meIconExtractor {
+    @Nullable
+    public static Bitmap generateFromFile(@NonNull File file) {
+        try(ZipFile zipFile = new ZipFile(file)) {
+            String iconFile = getIconLocation(zipFile, zipFile.getEntry("META-INF/MANIFEST.MF"));
+            if (iconFile == null) {
+                // Not a J2ME JAR
+                return null;
+            }
+            ZipEntry iconEntry = zipFile.getEntry(iconFile);
+            if (iconEntry != null) {
+                return BitmapFactory.decodeStream(zipFile.getInputStream(iconEntry));
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    @Nullable
+    private static String getIconLocation(@NonNull ZipFile zipFile, @Nullable ZipEntry zipEntry) {
+        if (zipEntry == null) {
+            return null;
+        }
+        try {
+            Manifest manifest = new Manifest(zipFile.getInputStream(zipEntry));
+            Attributes attributes = manifest.getMainAttributes();
+            // The logic is derived from J2ME Loader (ru.woesss.j2me.jar.Descriptor#getIcon())
+            String icon = attributes.getValue("MIDlet-Icon");
+            if (icon == null || icon.trim().isEmpty()) {
+                String midlet = "MIDlet-" + 1;
+                icon = attributes.getValue(midlet);
+                if (icon == null) {
+                    return null;
+                }
+                int start = icon.indexOf(',');
+                if (start != -1) {
+                    int end = icon.indexOf(',', ++start);
+                    if (end != -1)
+                        icon = icon.substring(start, end);
+                }
+            }
+            icon = icon.trim();
+            if (icon.isEmpty()) {
+                return null;
+            }
+            while (icon.charAt(0) == '/') {
+                icon = icon.substring(1);
+            }
+            return icon;
+        } catch (IOException ignore) {
+        }
+        return null;
+    }
+}