Support .img.tar format for ODIN

app/src/main/java/com/topjohnwu/magisk/utils/TarEntry.java

@@ -0,0 +1,27 @@
+package com.topjohnwu.magisk.utils;
+
+import org.kamranzafar.jtar.TarHeader;
+
+import java.io.File;
+
+public class TarEntry extends org.kamranzafar.jtar.TarEntry {
+
+    public TarEntry(File file, String entryName) {
+        super(file, entryName);
+    }
+
+    public TarEntry(byte[] headerBuf) {
+        super(headerBuf);
+    }
+
+    /*
+    * Workaround missing java.nio.file.attribute.PosixFilePermission
+    * Simply just assign a default permission to the file
+    * */
+
+    @Override
+    public void extractTarHeader(String entryName) {
+        int permissions = file.isDirectory() ? 040755 : 0100644;
+        header = TarHeader.createHeader(entryName, file.length(), file.lastModified() / 1000, file.isDirectory(), permissions);
+    }
+}