InMemoryDexClassLoader dump

'use strict';

console.log("[*] In Memory Dex Dump v0.1 - @cryptax");

Java.perform(function() {
    var memoryclassLoader = Java.use("dalvik.system.InMemoryDexClassLoader");
    memoryclassLoader.$init.overload('java.nio.ByteBuffer', 'java.lang.ClassLoader').implementation = function(dexbuffer, loader) {
        console.log("[*] Hooking InMemoryDexClassLoader");
        var object = this.$init(dexbuffer, loader);

        /* dexbuffer is a Java ByteBuffer 
           you cannot dump to /sdcard unless the app has rights to
         */
        var remaining = dexbuffer.remaining();
        const filename = '/data/data/YOUR-PACKAGE-NAME/dump.dex';

        console.log("[*] Opening file name=" + filename + " to write " + remaining + " bytes");
        const f = new File(filename, 'wb');
        var buf = new Uint8Array(remaining);
        for (var i = 0; i < remaining; i++) {
            buf[i] = dexbuffer.get();
            //debug: console.log("buf["+i+"]="+buf[i]);
        }
        console.log("[*] Writing " + remaining + " bytes...");
        f.write(buf);
        f.close();

        // checking
        remaining = dexbuffer.remaining();
        if (remaining > 0) {
            console.log("[-] Error: There are " + remaining + " remaining bytes!");
        } else {
            console.log("[+] Dex dumped successfully in " + filename);
        }

        return object;
    }


});