feat: support GZIPBase64 packer

generator/src/main/java/com/reajason/javaweb/memshell/packer/GzipBase64.java

@@ -0,0 +1,18 @@
+package com.reajason.javaweb.memshell.packer;
+
+import com.reajason.javaweb.memshell.config.GenerateResult;
+import com.reajason.javaweb.memshell.utils.CommonUtil;
+import lombok.SneakyThrows;
+import org.apache.commons.codec.binary.Base64;
+
+/**
+ * @author ReaJason
+ * @since 2025/1/22
+ */
+public class GzipBase64 implements Packer {
+    @Override
+    @SneakyThrows
+    public String pack(GenerateResult generateResult) {
+        return Base64.encodeBase64String(CommonUtil.gzipCompress(generateResult.getInjectorBytes()));
+    }
+}

generator/src/main/java/com/reajason/javaweb/memshell/packer/Packer.java

@@ -44,6 +44,10 @@ public interface Packer {
          */
         Base64(new Base64Packer()),
 
+        /**
+         * GzipBase64
+         */
+        GzipBase64(new GzipBase64()),
         /**
          * BCEL
          */

generator/src/main/java/com/reajason/javaweb/memshell/utils/CommonUtil.java

@@ -2,10 +2,12 @@ package com.reajason.javaweb.memshell.utils;
 
 import com.reajason.javaweb.memshell.config.Server;
 
+import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.security.SecureRandom;
 import java.util.Random;
+import java.util.zip.GZIPInputStream;
 import java.util.zip.GZIPOutputStream;
 
 /**
@@ -43,6 +45,19 @@ public class CommonUtil {
         return out.toByteArray();
     }
 
+    public static byte[] gzipDecompress(byte[] data) throws IOException {
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        try (GZIPInputStream gzip = new GZIPInputStream(new ByteArrayInputStream(data))) {
+            byte[] buffer = new byte[1024];
+            int length;
+            while ((length = gzip.read(buffer)) != -1) {
+                out.write(buffer, 0, length);
+
+            }
+        }
+        return out.toByteArray();
+    }
+
     public static String getRandomString(int length) {
         String str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
         SecureRandom random = new SecureRandom();

generator/src/test/java/com/reajason/javaweb/memshell/packer/GzipBase64Test.java

@@ -0,0 +1,25 @@
+package com.reajason.javaweb.memshell.packer;
+
+import com.reajason.javaweb.memshell.config.GenerateResult;
+import com.reajason.javaweb.memshell.utils.CommonUtil;
+import lombok.SneakyThrows;
+import org.apache.commons.codec.binary.Base64;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+/**
+ * @author ReaJason
+ * @since 2025/1/22
+ */
+class GzipBase64Test {
+
+    @Test
+    @SneakyThrows
+    void compress() {
+        GenerateResult generateResult = new GenerateResult();
+        generateResult.setInjectorBytes("hello world".getBytes());
+        String pack = new GzipBase64().pack(generateResult);
+        assertEquals("hello world", new String(CommonUtil.gzipDecompress(Base64.decodeBase64(pack))));
+    }
+}