def _create_class_structs__slices(classinfo, endmarkers=True):
"""Create the IDA structs for a C++ class."""
classname = classinfo.classname
# Open or create the structs.
sidf = idau.struct_open(classname + '::fields', create=True)
sid = idau.struct_open(classname, create=True)
if sid is None or sidf is None:
_log(0, 'Could not create class structs for {}', classname)
return None
assert all(not idc.is_union(s) for s in (sidf, sid))
# Calculate the size of the ::fields struct.
if classinfo.superclass:
# If we have a superclass, our fields start after our superclass's fields end.
fields_start = classinfo.superclass.class_size
else:
# If we don't have a superclass, our fields start after our vtable.
fields_start = idau.WORD_SIZE
fields_size = classinfo.class_size - fields_start
# Add an ::end member to the fields struct if requested.
if endmarkers:
ret = idc.add_struc_member(sidf, classname + '::end', fields_size,
idc.FF_UNK, -1, 0)
if ret not in (0, idc.STRUC_ERROR_MEMBER_NAME,
idc.STRUC_ERROR_MEMBER_OFFSET):
# If that didn't work that's too bad, but continue anyway.
_log(0, 'Could not create {}::end', classname)
return sid, sidf, fields_start
def struct_open(name, create=False, union=None):
"""Get the SID of the IDA struct with the given name, optionally creating it."""
sid = ida_struct.get_struc_id(name)
if sid == idc.BADADDR:
if not create:
return None
sid = struct_create(name, union=bool(union))
elif union is not None:
is_union = bool(idc.is_union(sid))
if union != is_union:
return None
return sid
def read_struct(ea, struct=None, sid=None, members=None, asobject=False):
"""Read a structure from the given address.
This function reads the structure at the given address and converts it into a dictionary or
accessor object.
Arguments:
ea: The linear address of the start of the structure.
Options:
sid: The structure ID of the structure type to read.
struct: The name of the structure type to read.
members: A list of the names of the member fields to read. If members is None, then all
members are read. Default is None.
asobject: If True, then the struct is returned as a Python object rather than a dict.
One of sid and struct must be specified.
"""
# Handle sid/struct.
if struct is not None:
sid2 = ida_struct.get_struc_id(struct)
if sid2 == idc.BADADDR:
raise ValueError('Invalid struc name {}'.format(struct))
if sid is not None and sid2 != sid:
raise ValueError('Invalid arguments: sid={}, struct={}'.format(
sid, struct))
sid = sid2
else:
if sid is None:
raise ValueError('Invalid arguments: sid={}, struct={}'.format(
sid, struct))
if ida_struct.get_struc_name(sid) is None:
raise ValueError('Invalid struc id {}'.format(sid))
# Iterate through the members and add them to the struct.
union = idc.is_union(sid)
struct = {}
for offset, name, size in idautils.StructMembers(sid):
if members is not None and name not in members:
continue
_read_struct_member(struct, sid, union, ea, offset, name, size,
asobject)
if asobject:
struct = objectview(struct, ea, ida_struct.get_struc_size(sid))
return struct
def _set_class_style(style):
"""Set the global class style."""
global _style_was_set, _create_class_structs, _populate_class_structs
assert style in (CLASS_SLICES, CLASS_UNIONS)
# Check the current style based on OSObject, a class that should always exist.
sid = idau.struct_open('OSObject')
want_union = style == CLASS_UNIONS
if sid is None:
# No global style has been set.
idau.struct_create('OSObject', union=want_union)
else:
# A style already exists. Check that the requested style matches.
is_union = bool(idc.is_union(sid))
if is_union != want_union:
raise ValueError('Incompatible style {}', style)
# Set the appropriate functions based on the style.
if style == CLASS_SLICES:
_create_class_structs = _create_class_structs__slices
_populate_class_structs = _populate_class_structs__slices
else:
_create_class_structs = _create_class_structs__unions
_populate_class_structs = _populate_class_structs__unions
