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Copy pathSerializedType.py
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334 lines (281 loc) · 11.9 KB
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from struct import Struct, pack
from typing import Union, Tuple, List, TYPE_CHECKING
import weakref
from ..enums import ClassIDType, CommonString, CommonStringReversed
from ..streams import EndianBinaryReader, EndianBinaryWriter
from ..helpers.TypeTreeHelper import TypeTreeNode
if TYPE_CHECKING:
from .SerializedFile import SerializedFileHeader
from . import SerializedFile
from ..exceptions import sanity_check
from .. import config
NODE_STRUCT = None
NODE_STRUCT_KEYS = None
NODE_STRUCT_MODIFIED = False
def reset_globals():
global NODE_STRUCT, NODE_STRUCT_KEYS, NODE_STRUCT_MODIFIED
NODE_STRUCT = "hBBIIiii"
NODE_STRUCT_KEYS = [
"m_Version",
"m_Level",
"m_TypeFlags",
"m_TypeStrOffset",
"m_NameStrOffset",
"m_ByteSize",
"m_Index",
"m_MetaFlag",
]
NODE_STRUCT_MODIFIED = False
def set_globals(endian, version):
global NODE_STRUCT, NODE_STRUCT_KEYS, NODE_STRUCT_MODIFIED
if not NODE_STRUCT_MODIFIED:
NODE_STRUCT = f"{endian}" + NODE_STRUCT
if version >= 19:
# do it only once per run
NODE_STRUCT += 'Q'
NODE_STRUCT_KEYS.append("m_RefTypeHash")
NODE_STRUCT_MODIFIED = True
NODE_STRUCT = Struct(NODE_STRUCT)
reset_globals()
class SerializedType:
class_id: int
is_stripped_type: bool
is_changed: bool
script_type_index = -1
nodes: list = [] # TypeTreeNode
script_id: bytes # Hash128
old_type_hash: bytes # Hash128}
def __init__(self, reader: EndianBinaryReader, serialized_file: "SerializedFile", is_ref_type: bool):
self._serialized_file = weakref.proxy(serialized_file)
self.is_ref_type = is_ref_type
self.string_data = None
self.is_changed = False
version = serialized_file.header.version
set_globals(reader.endian, version)
# read SerializedType from the stream
self.class_id = reader.read_int()
if version >= 16:
self.is_stripped_type = reader.read_boolean()
if version >= 17:
self.script_type_index = reader.read_short()
if version >= 13:
self.script_id = None
if (
(is_ref_type and self.script_type_index >= 0)
or (version < 16 and self.class_id < 0)
or (version >= 16 and self.class_id == ClassIDType.MonoBehaviour)
):
self.script_id = reader.read_bytes(16)
self.old_type_hash = reader.read_bytes(16)
if self._serialized_file.type_trees_saved:
if version >= 12 or version == 10:
self.read_type_tree_blob(reader)
else:
self.read_type_tree(reader)
if version >= 21:
if is_ref_type:
self.m_ClassName = reader.read_string_to_null()
self.m_NameSpace = reader.read_string_to_null()
self.m_AssemblyName = reader.read_string_to_null()
else:
self.type_dependencies = reader.read_int_array()
def save(self, writer):
version = self._serialized_file.header.version
writer.write_int(self.class_id)
if version >= 16:
writer.write_boolean(self.is_stripped_type)
if version >= 17:
writer.write_short(self.script_type_index)
if version >= 13:
if self.script_id is not None:
writer.write_bytes(self.script_id) # Hash128
writer.write_bytes(self.old_type_hash) # Hash128
if self._serialized_file.type_trees_saved:
if version >= 12 or version == 10 and version != 22:
self.save_type_tree_blob(writer)
else:
self.save_type_tree(writer)
if version >= 21:
if self.is_ref_type:
writer.write_string_to_null(self.m_ClassName)
writer.write_string_to_null(self.m_NameSpace)
writer.write_string_to_null(self.m_AssemblyName)
else:
writer.write_int_array(self.type_dependencies, True)
def read_type_tree(self, reader: EndianBinaryReader):
type_tree = []
level_stack = [[0, 1]]
while level_stack:
level, count = level_stack[-1]
if count == 1:
level_stack.pop()
else:
level_stack[-1][1] -= 1
type_tree_node = TypeTreeNode(
m_Level=level,
m_Type=reader.read_string_to_null(),
m_Name=reader.read_string_to_null(),
m_ByteSize=reader.read_int(),
)
type_tree.append(type_tree_node)
if self.header.version == 2:
type_tree_node.m_VariableCount = reader.read_int()
if self.header.version != 3:
type_tree_node.m_Index = reader.read_int()
type_tree_node.m_TypeFlags = reader.read_int()
type_tree_node.m_Version = reader.read_int()
if self.header.version != 3:
type_tree_node.m_MetaFlag = reader.read_int()
children_count = reader.read_int()
if children_count:
level_stack.append([level + 1, children_count])
self.nodes = type_tree
def save_type_tree(self, writer: EndianBinaryWriter):
nodes = self.nodes
for i, node in nodes:
writer.write_string_to_null(node.m_Type)
writer.write_string_to_null(node.m_Name)
writer.write_int(node.byte_size)
if self.header.version == 2:
writer.write_int(node.m_VariableCount)
if self.header.version != 3:
writer.write_int(node.m_Index)
writer.write_int(node.m_TypeFlags)
writer.write_int(node.m_Version)
if self.header.version != 3:
writer.write_int(node.m_MetaFlag)
# calc children count
children_count = 0
for node2 in nodes[i + 1 :]:
if node2.m_Level == node.m_Level:
break
if node2.m_Level == node.m_Level - 1:
children_count += 1
writer.write_int(children_count)
def read_type_tree_blob(self, reader: EndianBinaryReader):
"""Reads serialized TypeTree blob"""
""" layout: nodes count, string data size,
struct data (32 * nodes count), string data
"""
nodes_count = reader.read_u_int()
nodes_data_size = reader.read_u_int()
sanity_check("number_of_nodes of " +
f"{self._serialized_file.name} for {ClassIDType(self.class_id)}",
nodes_count, 0xFFFFF)
self.struct_data = reader.read(NODE_STRUCT.size * nodes_count)
self.string_data = reader.read(nodes_data_size)
if not self._serialized_file._use_type_trees:
return
strings_reader = EndianBinaryReader(self.string_data, reader.endian)
self.nodes = [None] * nodes_count
for i, raw_node in enumerate(NODE_STRUCT.iter_unpack(self.struct_data)):
m_Type = self.read_common_string(strings_reader, raw_node[3])
m_Name = self.read_common_string(strings_reader, raw_node[4])
self.nodes[i] = TypeTreeNode(
**dict(zip(NODE_STRUCT_KEYS, raw_node)), m_Type=m_Type, m_Name=m_Name
)
if False and config.DEBUG:
blob_names = []
list(filter(lambda x: blob_names.append(x) if x not in blob_names and (
x not in CommonStringReversed.keys()) else False, [i.m_Type for i in self.nodes]))
list(filter(lambda x: blob_names.append(x) if x not in blob_names and (
x not in CommonStringReversed.keys()) else False, [i.m_Name for i in self.nodes]))
total_buf_size = sum(len(i.encode("utf-8")) + 1 for i in blob_names)
if total_buf_size < strings_reader.Length:
self._tail = strings_reader.read_the_rest() # data after the nodes?
def save_type_tree_blob(self, writer: EndianBinaryWriter):
# node count
# stream data size
# node data
# string data
nodes = self.nodes
# number of nodes
writer.write_u_int(len(nodes))
# string data size
raw_data_len_pos = writer.Position
writer.write_u_int(len(self.string_data))
if not self.is_changed:
# no need for a fancy parsing if it's the same data
writer.write(self.struct_data)
writer.write(self.string_data)
return
# recreate strings data
string_buffer = EndianBinaryWriter(endian=writer.endian)
name_offsets = {}
type_offsets = {}
for node in nodes:
t_offset = self.get_common_offset(node.m_Type)
if t_offset is not None:
if not t_offset in type_offsets:
type_offsets[node.m_Type] = t_offset
elif not node.m_Type in type_offsets:
type_offsets[node.m_Type] = string_buffer.Position
string_buffer.write_string_to_null(node.m_Type)
n_offset = self.get_common_offset(node.m_Name)
if n_offset is not None:
if not n_offset in name_offsets:
name_offsets[node.m_Name] = n_offset
elif not node.m_Name in name_offsets:
name_offsets[node.m_Name] = string_buffer.Position
string_buffer.write_string_to_null(node.m_Name)
# recreate nodes data
for node in nodes:
# version
writer.write_u_short(node.m_Version)
# level
writer.write_byte(node.m_Level)
# is array
writer.write_u_byte(node.m_TypeFlags)
# type str offset
writer.write_u_int(type_offsets[node.m_Type])
# name str offset
writer.write_u_int(name_offsets[node.m_Name])
# byte size
writer.write_int(node.m_ByteSize)
# index
writer.write_int(node.m_Index)
# meta flag
writer.write_int(node.m_MetaFlag)
# ref hash
if self._serialized_file.header.version > 19:
writer.write_u_long(node.m_RefTypeHash)
# write the proper strings data length
after_pos = writer.Position
writer.Position = raw_data_len_pos
writer.write_u_int(string_buffer.Length)
writer.Position = after_pos
# write the strings data
writer.write(string_buffer.save())
# unknown remaining data?
if getattr(self, "_tail", None) and self._tail:
string_buffer.write(self._tail)
@staticmethod
def compute_hash(type_tree):
import hashlib
md4 = hashlib.new("md4")
strings_values = [
(node.m_TypeStrOffset, node.m_NameStrOffset) for node in type_tree
]
for i, node in enumerate(type_tree):
md4.update(strings_values[i][0].encode("utf-8"))
md4.update(strings_values[i][1].encode("utf-8"))
md4.update(pack('i', node.m_ByteSize))
md4.update(pack('i', int(node.m_TypeFlags)))
md4.update(pack('i', int(node.m_Version)))
md4.update(pack('i', int(node.m_MetaFlags & 0x4000)))
return md4.digest()
@staticmethod
def read_common_string(reader: EndianBinaryReader, offset: int) -> str:
#assert offset & 0x80000000 < reader.Length, "Wrong offset of TypeTree node string data"
is_offset = (offset & 0x80000000) == 0
if is_offset:
reader.Position = offset
return reader.read_string_to_null()
offset &= 0x7FFFFFFF
return CommonString.get(offset, str(offset))
@staticmethod
def get_common_offset(name: str) -> Union[int, None]:
name = CommonStringReversed.get(name)
if name is not None:
return name | ~0x7FFFFFFF & 0xFFFFFFFF
return None