frida java/js 類型轉換

1 : byte[] 轉 CString 

假如byte 是二進制數據：

    function print_bytes(bytes) {
        var buf  = Memory.alloc(bytes.length);
        Memory.writeByteArray(buf, byte_to_ArrayBuffer(bytes));
        console.log(hexdump(buf, {offset: 0, length: bytes.length, header: false, ansi: true}));
    }
    function byte_to_ArrayBuffer(bytes) {
        var size = bytes.length;
        var tmparray = [];
        for (var i = 0; i < size; i++) { 
            var val = bytes[i];
            if(val < 0){
                val += 256;
            }
            tmparray[i] = val
        }
        return tmparray;
    }

普通字符串數據：

var JString = Java.use("java.lang.String");
JString.$new(bytes)

var ByteString = Java.use("com.android.okhttp.okio.ByteString");
ByteString.of(bytes).hex()

Java.openClassFile("/data/local/tmp/gson.dex").load();
var gson = Java.use("com.google.gson.Gson");
var Jgson = gson.$new();
Jgson.toJson(tmp)