fix: remap class names for store in disk cache (#1503)

jadx-core/src/main/java/jadx/core/dex/nodes/ClassNode.java

@@ -379,7 +379,9 @@ public class ClassNode extends NotificationAttrNode implements ILoadable, ICodeN
 			}
 		}
 		ICodeInfo codeInfo = root.getProcessClasses().generateCode(this);
-		codeCache.add(clsRawName, codeInfo);
+		if (codeInfo != ICodeInfo.EMPTY) {
+			codeCache.add(clsRawName, codeInfo);
+		}
 		return codeInfo;
 	}
 

jadx-core/src/main/java/jadx/core/utils/files/FileUtils.java

@@ -103,6 +103,10 @@ public class FileUtils {
 		}
 	}
 
+	public static void deleteFileIfExists(Path filePath) throws IOException {
+		Files.deleteIfExists(filePath);
+	}
+
 	public static boolean deleteDir(File dir) {
 		File[] content = dir.listFiles();
 		if (content != null) {
@@ -222,6 +226,15 @@ public class FileUtils {
 		}
 	}
 
+	public static void writeFile(Path file, String data) throws IOException {
+		FileUtils.makeDirsForFile(file);
+		Files.write(file, data.getBytes(StandardCharsets.UTF_8));
+	}
+
+	public static String readFile(Path textFile) throws IOException {
+		return new String(Files.readAllBytes(textFile), StandardCharsets.UTF_8);
+	}
+
 	@NotNull
 	public static File prepareFile(File file) {
 		File saveFile = cutFileName(file);
@@ -259,6 +272,28 @@ public class FileUtils {
 		return new String(hexChars, StandardCharsets.UTF_8);
 	}
 
+	/**
+	 * Zero padded hex string for first byte
+	 */
+	public static String byteToHex(int value) {
+		int v = value & 0xFF;
+		byte[] hexChars = new byte[] { HEX_ARRAY[v >>> 4], HEX_ARRAY[v & 0x0F] };
+		return new String(hexChars, StandardCharsets.US_ASCII);
+	}
+
+	/**
+	 * Zero padded hex string for int value
+	 */
+	public static String intToHex(int value) {
+		byte[] hexChars = new byte[8];
+		int v = value;
+		for (int i = 7; i >= 0; i--) {
+			hexChars[i] = HEX_ARRAY[v & 0x0F];
+			v >>>= 4;
+		}
+		return new String(hexChars, StandardCharsets.US_ASCII);
+	}
+
 	public static boolean isZipFile(File file) {
 		try (InputStream is = new FileInputStream(file)) {
 			byte[] headers = new byte[4];