app: use userspace copy

app/apk/src/main/java/com/topjohnwu/magisk/ui/flash/FlashViewModel.kt

@@ -82,9 +82,7 @@ class FlashViewModel : BaseViewModel() {
                     MagiskInstaller.Patch(uri, outItems, logItems).exec()
                 }
                 Const.Value.DOWNLOAD -> {
-                    if (uri == null || Build.VERSION.SDK_INT < 29) {
-                        return@launch
-                    }
+                    uri ?: return@launch
                     showReboot = false
                     MagiskInstaller.Download(uri.toString(), outItems, logItems).exec()
                 }

app/apk/src/main/res/layout/fragment_install_md2.xml

@@ -194,7 +194,6 @@
                             android:id="@+id/method_download"
                             style="@style/WidgetFoundation.RadioButton"
                             android:layout_width="match_parent"
-                            gone="@{android.os.Build.VERSION.SDK_INT < 29}"
                             android:layout_height="wrap_content"
                             android:text="@string/download_patch_file" />
 

app/core/src/main/java/com/topjohnwu/magisk/core/tasks/MagiskInstaller.kt

@@ -1,10 +1,8 @@
 package com.topjohnwu.magisk.core.tasks
 
 import android.net.Uri
-import android.os.FileUtils
 import android.os.Process
 import android.system.Os
-import androidx.annotation.RequiresApi
 import androidx.annotation.WorkerThread
 import androidx.core.os.postDelayed
 import com.topjohnwu.magisk.StubApk
@@ -364,7 +362,7 @@ abstract class MagiskInstallImpl protected constructor(
                     // raw image
                     outFile = MediaStoreUtils.getFile("$destName.img")
                     outStream = outFile.uri.outputStream()
-                    val channel = FileInputStream(uri.openFd("r").fileDescriptor).channel
+                    val channel = FileInputStream(uri.openFd().fileDescriptor).channel
                     val boot = installDir.getChildFile("boot.img")
 
                     try {
@@ -432,7 +430,6 @@ abstract class MagiskInstallImpl protected constructor(
         return true
     }
 
-    @RequiresApi(29)
     private fun processUrl(url: String): Boolean {
         // Download image from url
         try {
@@ -454,9 +451,9 @@ abstract class MagiskInstallImpl protected constructor(
         val outFile = MediaStoreUtils.getFile("$destName.img")
         try {
             val newBoot = installDir.getChildFile("new-boot.img")
-            outFile.uri.openFd().use { out ->
+            outFile.uri.outputStream().use { out ->
                 FileInputStream(newBoot).use { input ->
-                    FileUtils.copy(input, FileOutputStream(out.fileDescriptor))
+                    input.copyTo(out)
                 }
             }
             newBoot.delete()
@@ -531,7 +528,6 @@ abstract class MagiskInstallImpl protected constructor(
 
     protected suspend fun patchFile(file: Uri) = extractFiles() && processFile(file)
 
-    @RequiresApi(29)
     protected suspend fun patchFile(url: String) = extractFiles() && processUrl(url)
 
     protected suspend fun direct() = findImage() && extractFiles() && patchBoot() && flashBoot()
@@ -601,7 +597,6 @@ class MagiskInstaller {
         override suspend fun operations() = patchFile(uri)
     }
 
-    @RequiresApi(29)
     class Download(
         private val url: String,
         console: MutableList<String>,

app/core/src/main/java/com/topjohnwu/magisk/core/utils/MediaStoreUtils.kt

@@ -98,8 +98,7 @@ object MediaStoreUtils {
 
     fun Uri.outputStream() = cr.openOutputStream(this, "rwt") ?: throw FileNotFoundException()
 
-    fun Uri.openFd(mode: String = "rwt") = cr.openFileDescriptor(this, mode)
-        ?: throw FileNotFoundException()
+    fun Uri.openFd() = cr.openFileDescriptor(this, "r") ?: throw FileNotFoundException()
 
     val Uri.displayName: String get() {
         if (scheme == "file") {