import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.List;
import java.util.jar.JarEntry;
import java.util.jar.JarOutputStream;
public class DllToClassConverter {
private final String dllPath;
private final String outputPath;
public DllToClassConverter(String dllPath, String outputPath) {
this.dllPath = dllPath;
this.outputPath = outputPath;
}
public void convert() throws IOException { // Read the DLL file byte[] dllBytes = Files.readAllBytes(Path.of(dllPath)); // Create a temporary directory for processing
File tempDir = new File("temp"); tempDir.mkdir();
try { // Create class file structure String className = new File(dllPath).getName().replace(".dll", ""); StringBuilder classBuilder = new StringBuilder(); // Generate class header classBuilder.append("public class ").append(className).append(" {\n"); // Add native methods based on DLL exports List<String> exportedMethods = extractExportedMethods(dllBytes); for (String method : exportedMethods) { classBuilder.append(" public native void ").append(method).append("();\n"); }
// Add static initializer to load the DLL classBuilder.append("\n static {\n"); classBuilder.append(" System.loadLibrary(\"").append(className).append("\");\n"); classBuilder.append(" }\n"); classBuilder.append("}\n"); // Write the class file String classFileName = className + ".class"; File classFile = new File(tempDir, classFileName); try (FileOutputStream fos = new FileOutputStream(classFile)) { fos.write(classBuilder.toString().getBytes()); } // Create JAR file createJarFile(tempDir, new File(outputPath)); } finally { // Cleanup deleteDirectory(tempDir); } } private List<String> extractExportedMethods(byte[] dllBytes) { // This is a simplified implementation // In a real implementation, you would need to parse the DLL's export table List<String> methods = new ArrayList<>(); methods.add("method1"); methods.add("method2"); return methods; } private void createJarFile(File sourceDir, File jarFile) throws IOException { try (JarOutputStream jos = new JarOutputStream(new FileOutputStream(jarFile))) { for (File file : sourceDir.listFiles()) { if (file.isFile()) { JarEntry entry = new JarEntry(file.getName()); jos.putNextEntry(entry); Files.copy(file.toPath(), jos); jos.closeEntry(); } } } } private void deleteDirectory(File dir) { File[] files = dir.listFiles(); if (files != null) { for (File file : files) { if (file.isDirectory()) { deleteDirectory(file); } else { file.delete(); } } } dir.delete(); } public static void main(String[] args) { if (args.length != 2) { System.out.println("Usage: java DllToClassConverter <dll_path> <output_path>"); return; } try { DllToClassConverter converter = new DllToClassConverter(args[0], args[1]); converter.convert(); System.out.println("Conversion completed successfully!"); } catch (IOException e) { System.err.println("Error during conversion: " + e.getMessage()); e.printStackTrace(); } } }
