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ObjectReader.py
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236 lines (196 loc) · 7.76 KB
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from ..enums import ClassIDType
from . import SerializedFile
from .. import classes
from ..streams import EndianBinaryReader, EndianBinaryWriter
from ..helpers import TypeTreeHelper
class ObjectReader:
byte_start: int
byte_size: int
type_id: int
class_id: int
type: ClassIDType
path_id: int
# serialized_type: SerializedType
_read_until: int
# saves where the parser stopped
# in case that not all data is read
# and the obj.data is changed, the unknown data can be added again
def __init__(self, assets_file, reader: EndianBinaryReader):
self.assets_file = assets_file
self.reader = reader
self.data = b""
self.version = assets_file.version
self.version2 = assets_file.header.version
self.platform = assets_file.target_platform
self.build_type = assets_file.build_type
header = assets_file.header
types = assets_file.types
if assets_file.big_id_enabled:
self.path_id = reader.read_long()
elif header.version < 14:
self.path_id = reader.read_int()
else:
reader.align_stream()
self.path_id = reader.read_long()
if header.version >= 22:
self.byte_start_offset = (self.reader.real_offset(), 8)
self.byte_start = reader.read_long()
else:
self.byte_start_offset = (self.reader.real_offset(), 4)
self.byte_start = reader.read_u_int()
self.byte_start += header.data_offset
self.byte_header_offset = header.data_offset
self.byte_base_offset = self.reader.BaseOffset
self.byte_size_offset = (self.reader.real_offset(), 4)
self.byte_size = reader.read_u_int()
self.type_id = reader.read_int()
if header.version < 16:
self.class_id = reader.read_u_short()
if types:
self.serialized_type = (
x for x in types if x.class_id == self.type_id).__next__()
else:
self.serialized_type = SerializedFile.SerializedType(
reader, self.assets_file)
else:
typ = types[self.type_id]
self.serialized_type = typ
self.class_id = typ.class_id
self.type = ClassIDType(self.class_id)
if header.version < 11:
self.is_destroyed = reader.read_u_short()
if 11 <= header.version < 17:
script_type_index = reader.read_short()
if self.serialized_type:
self.serialized_type.script_type_index = script_type_index
if header.version == 15 or header.version == 16:
self.stripped = reader.read_byte()
def write(self, header, writer: EndianBinaryWriter, data_writer: EndianBinaryWriter):
if self.assets_file.big_id_enabled:
writer.write_long(self.path_id)
elif header.version < 14:
writer.write_int(self.path_id)
else:
writer.align_stream()
writer.write_long(self.path_id)
if self.data:
data = self.data
# in some cases the parser doesn't read all of the object data
# games might still require the missing data
# so following code appends the missing data back to edited objects
if self.type != ClassIDType.MonoBehaviour:
end_pos = self.byte_start + self.byte_size
if self._read_until and self._read_until != end_pos:
self.reader.Position = self._read_until
data += self.reader.read_bytes(end_pos - self._read_until)
else:
self.reset()
data = self.reader.read(self.byte_size)
if header.version >= 22:
writer.write_long(data_writer.Position)
else:
writer.write_u_int(data_writer.Position)
writer.write_u_int(len(data))
data_writer.write(data)
writer.write_int(self.type_id)
if header.version < 16:
writer.write_u_short(self.class_id)
if header.version < 11:
writer.write_u_short(self.is_destroyed)
if 11 <= header.version < 17:
writer.write_short(self.serialized_type.script_type_index)
if header.version == 15 or header.version == 16:
writer.write_byte(self.stripped)
def set_raw_data(self, data):
self.data = data
self.assets_file.mark_changed()
@property
def container(self):
return (
self.assets_file._container[self.path_id]
if self.path_id in self.assets_file._container
else None
)
@property
def Position(self):
return self.reader.Position
@Position.setter
def Position(self, pos):
self.reader.Position = pos
def reset(self):
self.reader.Position = self.byte_start
def read(self):
try:
obj = getattr(classes, self.type.name, classes.Object)(self)
except Exception as e:
raise e
# TODO: only specific exceptions here?
except:
# HACK: in case the parsing via the class fails this solution
# uses the type tree to set the variables and then changes the class
obj = classes.Object(self)
obj.__class__ = getattr(classes, self.type.name, classes.Object)
for key, val in obj.__dict__.items():
if " " in key:
obj.__dict__[key.replace(" ", "_")] = val
delattr(obj, key)
self._read_until = self.reader.Position
return obj
def get(self, key, default=None):
return getattr(self, key, default)
def __getattr__(self, item: str):
if hasattr(self.reader, item):
return getattr(self.reader, item)
def __repr__(self):
return "<%s %s>" % (self.__class__.__name__, self.type.name)
###################################################
#
# Typetree Stuff
#
###################################################
def dump_typetree(self, nodes: list = None) -> str:
self.reset()
sb = []
if nodes:
TypeTreeHelper.read_typetree_str(sb, nodes, self)
elif getattr(self.serialized_type, "nodes", None):
TypeTreeHelper.read_typetree_str(
sb, self.serialized_type.nodes, self)
return "".join(sb)
return ""
def dump_typetree_structure(self) -> str:
if getattr(self.serialized_type, "nodes", None):
return TypeTreeHelper.dump_typetree(self.serialized_type.nodes)
return ""
def read_typetree(self, nodes: list = None) -> dict:
self.reset()
tree = {}
if nodes:
tree = TypeTreeHelper.read_typetree(nodes, self)
elif self.serialized_type.nodes:
tree = TypeTreeHelper.read_typetree(
self.serialized_type.nodes, self)
return tree
def save_typetree(self, tree: dict, nodes: list = None, writer: EndianBinaryWriter = None):
if not writer:
writer = EndianBinaryWriter(endian=self.reader.endian)
if nodes:
TypeTreeHelper.write_typetree(tree, nodes, writer)
elif self.serialized_type.nodes:
TypeTreeHelper.write_typetree(
tree, self.serialized_type.nodes, writer)
else:
raise ValueError("There are no TypeTree nodes for this object.")
data = writer.bytes
self.set_raw_data(data)
return data
def get_raw_data(self) -> bytes:
pos = self.Position
self.reset()
ret = self.reader.read_bytes(self.byte_size)
self.Position = pos
return ret
def set_raw_data(self, data):
self.data = data
if self.assets_file:
self.assets_file.mark_changed()