feat: Add --striplibs argument to strip unwanted architectures

src/main/kotlin/app/morphe/cli/command/PatchCommand.kt

@@ -3,9 +3,9 @@ package app.morphe.cli.command
 import app.morphe.cli.command.model.FailedPatch
 import app.morphe.cli.command.model.PatchingResult
 import app.morphe.cli.command.model.PatchingStep
-import app.morphe.cli.command.model.PatchingStepResult
 import app.morphe.cli.command.model.addStepResult
 import app.morphe.cli.command.model.toSerializablePatch
+import app.morphe.gui.util.ApkLibraryStripper
 import app.morphe.library.ApkUtils
 import app.morphe.library.ApkUtils.applyTo
 import app.morphe.library.installation.installer.*
@@ -257,6 +257,13 @@ internal object PatchCommand : Runnable {
     )
     private var unsigned: Boolean = false
 
+    @CommandLine.Option(
+        names = ["--striplibs"],
+        description = ["Architectures to keep, comma-separated (e.g. arm64-v8a,x86). Strips all other native architectures."],
+        split = ",",
+    )
+    private var striplibs: List<String> = emptyList()
+
     override fun run() {
         // region Setup
 
@@ -408,6 +415,17 @@ internal object PatchCommand : Runnable {
                         patcherResult.applyTo(this)
                     }
                 )
+            }.also { rebuiltApk ->
+                if (striplibs.isNotEmpty()) {
+                    patchingResult.addStepResult(
+                        PatchingStep.STRIPPING_LIBS,
+                        {
+                            ApkLibraryStripper.stripLibraries(rebuiltApk, striplibs) { msg ->
+                                logger.info(msg)
+                            }
+                        }
+                    )
+                }
             }.let { patchedApkFile ->
                 if (!mount && !unsigned) {
                     patchingResult.addStepResult(

src/main/kotlin/app/morphe/cli/command/model/PatchingStep.kt

@@ -3,6 +3,7 @@ package app.morphe.cli.command.model
 enum class PatchingStep {
     PATCHING,
     REBUILDING,
+    STRIPPING_LIBS,
     SIGNING,
     INSTALLING
 }

src/main/kotlin/app/morphe/gui/util/ApkLibraryStripper.kt

@@ -0,0 +1,109 @@
+package app.morphe.gui.util
+
+import java.io.File
+import java.util.logging.Logger
+import java.util.zip.ZipFile
+import java.util.zip.ZipEntry
+import java.util.zip.ZipOutputStream
+
+/**
+ * Strips native libraries from an APK, keeping only specified architectures.
+ */
+object ApkLibraryStripper {
+
+    private val VALID_ARCHITECTURES = setOf(
+        "armeabi-v7a",
+        "arm64-v8a",
+        "x86",
+        "x86_64",
+        // Old obsolete architectures. Only found in Android 6.0 and earlier.
+        "armeabi",
+        "mips",
+        "mips64",
+    )
+
+    /**
+     * Validates that all requested architectures are known.
+     * Throws IllegalArgumentException if any are invalid.
+     */
+    private fun validateArchitectures(architectures: List<String>) {
+        // Error on no recognizable architectures.
+        require(architectures.isNotEmpty() && architectures.any { it in VALID_ARCHITECTURES }) {
+            "No valid architectures specified with --striplibs: $architectures " +
+                    "Valid architectures are: $VALID_ARCHITECTURES"
+        }
+
+        // Warn on unrecognizable.
+        val invalid = architectures.filter { it !in VALID_ARCHITECTURES }
+        if (invalid.isNotEmpty()) {
+            Logger.getLogger(this::class.java.name).warning(
+                "Ignoring unrecognized --striplibs architecture: '$invalid' " +
+                        "Valid architectures are: $VALID_ARCHITECTURES"
+            )
+        }
+    }
+
+    /**
+     * Strips native libraries from an APK file, keeping only the specified architectures.
+     *
+     * @param apkFile The APK file to strip libraries from (modified in-place).
+     * @param architecturesToKeep List of architectures to keep (e.g., ["arm64-v8a"]).
+     * @param onProgress Optional callback for progress updates.
+     */
+    fun stripLibraries(apkFile: File, architecturesToKeep: List<String>, onProgress: (String) -> Unit = {}) {
+        validateArchitectures(architecturesToKeep)
+
+        val keepSet = architecturesToKeep.toSet()
+        val tempFile = File(apkFile.parentFile, "${apkFile.name}.tmp")
+
+        var strippedCount = 0
+
+        ZipFile(apkFile).use { zip ->
+            ZipOutputStream(tempFile.outputStream().buffered()).use { zos ->
+                val entries = zip.entries()
+                while (entries.hasMoreElements()) {
+                    val entry = entries.nextElement()
+
+                    if (shouldStripEntry(entry.name, keepSet)) {
+                        strippedCount++
+                        continue
+                    }
+
+                    val newEntry = ZipEntry(entry.name).apply {
+                        if (entry.method == ZipEntry.STORED) {
+                            method = ZipEntry.STORED
+                            size = entry.size
+                            compressedSize = entry.compressedSize
+                            crc = entry.crc
+                        }
+                        entry.extra?.let { extra = it }
+                    }
+
+                    zos.putNextEntry(newEntry)
+                    zip.getInputStream(entry).use { it.copyTo(zos) }
+                    zos.closeEntry()
+                }
+            }
+        }
+
+        onProgress("Kept $architecturesToKeep, stripped $strippedCount native library files")
+
+        // Replace original with stripped version
+        apkFile.delete()
+        tempFile.renameTo(apkFile)
+    }
+
+    /**
+     * Returns true if the ZIP entry should be stripped (is a native lib for an architecture not in the keep set).
+     */
+    private fun shouldStripEntry(entryName: String, keepSet: Set<String>): Boolean {
+        if (!entryName.startsWith("lib/")) return false
+
+        // Entry format: lib/<arch>/libname.so
+        val parts = entryName.removePrefix("lib/").split("/", limit = 2)
+        if (parts.size < 2) return false
+
+        val arch = parts[0]
+        return arch !in keepSet
+    }
+}