add ropper

ROPgadget/ropgadget/ropchain/arch/ropmakerx86.py

@@ -84,14 +84,17 @@ class ROPMakerX86(object):
         return p
 
     def __write4bytes(self, address, data, data_addr, popDst, popSrc, write4where):
+        # write address to dst
         p  = pack("<I", popDst['vaddr'])
         p += pack("<I", address)
-        p += self.__padding(popDst, {})
+        p += self.__padding(popDst, {}) 
 
+        # write data to src
         p += pack("<I", popSrc['vaddr'])
         p += data
         p += self.__padding(popSrc, {popDst["gadget"].split()[1]: data_addr}) # Don't overwrite reg dst
 
+        # write src to [dst] (address pointed to by dst)
         p += pack("<I", write4where['vaddr'])
         p += self.__padding(write4where, {})