Added control and moved folder

Added control for empty passed argument and moved windows folder out for easier importing.

windows/native_exec/native_function.py

@@ -0,0 +1,87 @@
+import ctypes
+import mmap
+import platform
+import sys
+
+import windows
+import windows.winproxy
+import windows.generated_def as gdef
+
+from . import simple_x86 as x86
+from . import simple_x64 as x64
+
+
+class CustomAllocator(object):
+    int_size = {'32bit': 4, '64bit': 8}
+
+    def __init__(self):
+        self.maps = []
+        self.cur_offset = 0
+        self.cur_page_size = 0 # Force get_new_page on first request
+        self.names = []
+
+    @classmethod
+    def get_int_size(cls):
+        bits = platform.architecture()[0]
+        if bits not in cls.int_size:
+            raise ValueError("Unknow platform bits <{0}>".format(bits))
+        return cls.int_size[bits]
+
+    def get_new_page(self, size):
+        addr = windows.winproxy.VirtualAlloc(0, size, 0x1000, gdef.PAGE_EXECUTE_READWRITE)
+        mymap = (ctypes.c_char * size).from_address(addr)
+        mymap.addr = addr
+        self.maps.append(mymap)
+        self.cur_offset = 0
+        self.cur_page_size = size
+
+    def reserve_size(self, size):
+        if size + self.cur_offset > self.cur_page_size:
+            self.get_new_page((size + 0x1000) & ~0xfff)
+        addr = self.maps[-1].addr + self.cur_offset
+        self.cur_offset += size
+        return addr
+
+    def reserve_int(self, nb_int=1):
+        int_size = self.get_int_size()
+        return self.reserve_size(int_size * nb_int)
+
+    def write_code(self, code):
+        size = len(code)
+        if size + self.cur_offset > self.cur_page_size:
+            self.get_new_page((size + 0x1000) & ~0xfff)
+        self.maps[-1][self.cur_offset: self.cur_offset + size] = code
+        addr = self.maps[-1].addr + self.cur_offset
+        self.cur_offset += size
+        return addr
+
+    def close(self):
+        maps = self.maps
+        self.maps = []
+        self.cur_offset = 0
+        self.cur_page_size = 0
+        if getattr(sys, "path", None) is None:
+            # Path is None -> Python shutdown
+            return
+        for mymap in maps:
+            windows.winproxy.VirtualFree(mymap.addr, dwFreeType=gdef.MEM_RELEASE)
+
+    def __del__(self):
+        self.close()
+
+allocator = CustomAllocator()
+
+
+def create_function(code, types, calling_convention=ctypes.CFUNCTYPE):
+    """Create a python function that call raw machine code
+
+   :param str code: Raw machine code that will be called
+   :param list types: Return type and parameters type (see :mod:`ctypes`)
+   :return: the created function
+   :rtype: function
+     """
+    func_type = calling_convention(*types)
+    addr = allocator.write_code(code)
+    res = func_type(addr)
+    res.code_addr = addr
+    return res