fix: build correct file path for class from default package (#2854)

Author: skylot

jadx-cli/src/test/java/jadx/cli/TestInput.java

@@ -73,4 +73,12 @@ public void testResourceOnly() throws Exception {
 				path -> path.getFileName().toString().equalsIgnoreCase("AndroidManifest.xml"));
 		assertThat(files).isNotEmpty();
 	}
+
+	@Test
+	public void testNoRenameForDefPkg() throws Exception {
+		int result = execJadxCli(buildArgs(List.of("--rename-flags", "none"), "samples/defpkg.smali"));
+		assertThat(result).isEqualTo(0);
+		List<Path> files = collectJavaFilesInDir(outputDir);
+		assertThat(files).hasSize(1);
+	}
 }

jadx-cli/src/test/resources/samples/defpkg.smali

@@ -0,0 +1,2 @@
+.class public LA;
+.super Ljava/lang/Object;

jadx-core/src/main/java/jadx/core/dex/info/ClassInfo.java

@@ -214,9 +214,12 @@ public String makeAliasRawFullName() {
 	}
 
 	public String getAliasFullPath() {
-		return getAliasPkg().replace('.', File.separatorChar)
-				+ File.separatorChar
-				+ getAliasNameWithoutPackage().replace('.', '_');
+		String fileName = getAliasNameWithoutPackage().replace('.', '_');
+		String aliasPkg = getAliasPkg();
+		if (aliasPkg.isEmpty()) {
+			return fileName;
+		}
+		return aliasPkg.replace('.', File.separatorChar) + File.separatorChar + fileName;
 	}
 
 	public String getFullName() {