def expand_struct(struct_id, new_size):
struct = ida_struct.get_struc(struct_id)
if struct is None:
logging.warning("Struct id 0x%x wasn't found", struct_id)
return
logging.debug(
"Expanding struc %s 0x%x -> 0x%x",
ida_struct.get_struc_name(struct_id),
ida_struct.get_struc_size(struct_id),
new_size,
)
if ida_struct.get_struc_size(struct_id) > new_size - WORD_LEN:
return
fix_list = []
xrefs = idautils.XrefsTo(struct.id)
for xref in xrefs:
if xref.type == ida_xref.dr_R and xref.user == 0 and xref.iscode == 0:
member, full_name, x_struct = ida_struct.get_member_by_id(xref.frm)
if x_struct is not None:
old_name = ida_struct.get_member_name(member.id)
offset = member.soff
marker_name = "marker_%d" % random.randint(0, 0xFFFFFF)
idc.add_struc_member(
x_struct.id,
marker_name,
member.soff + new_size,
idaapi.FF_DATA | idaapi.FF_BYTE,
-1,
0,
)
logging.debug(
"Delete member (0x%x-0x%x)", member.soff, member.soff + new_size - 1
)
ida_struct.del_struc_members(
x_struct, member.soff, member.soff + new_size - 1
)
fix_list.append(
[
x_struct.id,
old_name,
offset,
idaapi.FF_STRUCT | idaapi.FF_DATA,
struct_id,
new_size,
]
)
else:
logging.warning("Xref wasn't struct_member 0x%x", xref.frm)
ret = push_ptr_member_to_struct(
ida_struct.get_struc(struct_id), None, None, new_size - WORD_LEN
)
logging.debug("Now fix args:")
for fix_args in fix_list:
ret = idc.add_struc_member(*fix_args)
logging.debug("%s = %d", fix_args, ret)
x_struct_id = fix_args[0]
idc.del_struc_member(x_struct_id, ida_struct.get_struc_size(x_struct_id))
def update_idb(self, delete_existing_members=True):
sid = ida_struct.get_struc_id(self._name)
sptr = ida_struct.get_struc(sid)
if sid == idc.BADADDR:
sid = ida_struct.add_struc(idc.BADADDR, self._name, 0)
sptr = ida_struct.get_struc(sid)
else:
if delete_existing_members:
ida_struct.del_struc_members(sptr, 0, 0xffffffff)
for f in self._fields:
ida_struct.add_struc_member(sptr, f.name, f.offset,
(idc.FF_BYTE | idc.FF_DATA)
& 0xFFFFFFFF, None, 1)
member_name = "{}.{}".format(self._name, f.name)
idc.SetType(
idaapi.get_member_by_fullname(member_name)[0].id, f.type)
ida_auto.auto_wait()
def expand_struct(struct_id, new_size):
struct = ida_struct.get_struc(struct_id)
if struct is None:
log.warning("Struct id 0x%X wasn't found", struct_id)
return
log.debug(
"Expanding struc %s, size: 0x%X -> 0x%X",
ida_struct.get_struc_name(struct_id),
ida_struct.get_struc_size(struct_id),
new_size,
)
if ida_struct.get_struc_size(struct_id) > new_size - WORD_LEN:
return
fix_list = []
xrefs = idautils.XrefsTo(struct.id)
for xref in xrefs:
if xref.type == ida_xref.dr_R and xref.user == 0 and xref.iscode == 0:
res = ida_struct.get_member_by_id(xref.frm)
if not res or not res[0]:
log.warning("Xref from %08X wasn't struct_member", xref.frm)
continue
member = res[0]
x_struct = ida_struct.get_member_struc(ida_struct.get_member_fullname(member.id))
assert x_struct
old_name = ida_struct.get_member_name(member.id)
offset = member.soff
# FIXME: why use random here?
marker_name = "marker_%d" % random.randint(0, 0xFFFFFF)
# FIXME: check if add_struc_member actually added a member
idc.add_struc_member(
x_struct.id,
marker_name,
member.soff + new_size,
idaapi.FF_DATA | idaapi.FF_BYTE,
-1,
0,
)
log.debug(
"Delete member (0x%X-0x%X)",
member.soff,
member.soff + new_size - 1,
)
# FIXME: check if struc member actually deleted
ida_struct.del_struc_members(x_struct, member.soff, member.soff + new_size - 1)
fix_list.append(
[
x_struct.id,
old_name,
offset,
idaapi.FF_STRUCT | idaapi.FF_DATA,
struct_id,
new_size,
]
)
ret = add_to_struct(ida_struct.get_struc(struct_id), None, None, new_size - WORD_LEN)
log.debug("Now fix args:")
for fix_args in fix_list:
ret = idc.add_struc_member(*fix_args)
log.debug("%s = %d", fix_args, ret)
x_struct_id = fix_args[0]
idc.del_struc_member(x_struct_id, ida_struct.get_struc_size(x_struct_id))