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Copy pathBundleFile.py
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746 lines (637 loc) · 28 KB
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from __future__ import annotations
# TODO: implement encryption for saving files
import io
import mmap
import os
import re
import tempfile
import weakref
from collections import namedtuple
from typing import BinaryIO, Optional, Union, cast
from .. import config
from ..enums import ArchiveFlags, ArchiveFlagsOld, CompressionFlags
from ..helpers import ArchiveStorageManager, CompressionHelper
from ..helpers.UnityVersion import UnityVersion
from ..streams import EndianBinaryReader, EndianBinaryWriter
from . import File
from .replacers import BytesReplacer, Replacer, SourceSliceReplacer, TempFileReplacer
BlockInfo = namedtuple("BlockInfo", "uncompressedSize compressedSize flags")
DirectoryInfoFS = namedtuple("DirectoryInfoFS", "offset size flags path")
reVersion = re.compile(r"(\d+)\.(\d+)\.(\d+)\w.+")
class BundleFile(File.File):
format: int
is_changed: bool
signature: str
version_engine: str
version_player: str
dataflags: Union[ArchiveFlags, ArchiveFlagsOld]
decryptor: Optional[ArchiveStorageManager.ArchiveStorageDecryptor] = None
_uses_block_alignment: bool = False
_block_info_flags: int = 0
_blocks_tmp_path: Optional[str] = None
_blocks_tmp_file = None
_blocks_mmap = None
_blocks_reader: Optional[EndianBinaryReader] = None
_directory_info_map: dict[str, DirectoryInfoFS]
_original_file_refs: dict[str, weakref.ReferenceType]
def __init__(
self,
reader: EndianBinaryReader,
parent: File,
name: Optional[str] = None,
**kwargs,
):
super().__init__(parent=parent, name=name, **kwargs)
signature = self.signature = reader.read_string_to_null()
self.version = reader.read_u_int()
self.version_player = reader.read_string_to_null()
self.version_engine = reader.read_string_to_null()
if signature == "UnityArchive":
raise NotImplementedError("BundleFile - UnityArchive")
elif signature in ["UnityWeb", "UnityRaw"]:
if self.version == 6:
m_DirectoryInfo, blocksReader = self.read_fs(reader)
else:
m_DirectoryInfo, blocksReader = self.read_web_raw(reader)
elif signature == "UnityFS":
m_DirectoryInfo, blocksReader = self.read_fs(reader)
else:
raise NotImplementedError(f"Unknown Bundle signature: {signature}")
self._blocks_reader = blocksReader
self._directory_info_map = {info.path: info for info in m_DirectoryInfo}
self.read_files(blocksReader, m_DirectoryInfo)
self._original_file_refs = {name: weakref.ref(f) for name, f in self.files.items()}
def _cleanup_temp_blocks_storage(self):
mmap_obj = getattr(self, "_blocks_mmap", None)
file_obj = getattr(self, "_blocks_tmp_file", None)
tmp_path = getattr(self, "_blocks_tmp_path", None)
self._blocks_reader = None
self._blocks_mmap = None
self._blocks_tmp_file = None
self._blocks_tmp_path = None
if mmap_obj is not None:
try:
mmap_obj.close()
except (BufferError, OSError, ValueError):
pass
if file_obj is not None:
try:
file_obj.close()
except OSError:
pass
if tmp_path:
try:
os.remove(tmp_path)
except OSError:
pass
def __del__(self):
self._cleanup_temp_blocks_storage()
@staticmethod
def _copy_reader_data(reader: EndianBinaryReader, size: int, output: BinaryIO) -> int:
remaining = int(size)
written = 0
while remaining > 0:
read_size = min(1024 * 1024, remaining)
data = reader.read_bytes(read_size)
if len(data) != read_size:
raise EOFError("Unexpected EOF while reading bundle block")
output.write(data)
remaining -= read_size
written += read_size
return written
def _write_decompressed_block(
self,
reader: EndianBinaryReader,
block_info: BlockInfo,
index: int,
output: BinaryIO,
) -> None:
comp_flag = CompressionFlags(block_info.flags & ArchiveFlags.CompressionTypeMask)
if comp_flag == CompressionFlags.NONE:
self._copy_reader_data(reader, block_info.compressedSize, output)
return
is_encrypted = self.decryptor is not None and block_info.flags & 0x100
if comp_flag == CompressionFlags.LZMA and not is_encrypted:
compressed_size = int(block_info.compressedSize)
if compressed_size < 5:
raise ValueError("LZMA bundle block is missing its properties header")
properties = reader.read_bytes(5)
if len(properties) != 5:
raise EOFError("Unexpected EOF while reading LZMA properties")
decompressor = CompressionHelper.create_lzma_decompressor(properties)
remaining = compressed_size - 5
written = 0
while remaining > 0:
read_size = min(1024 * 1024, remaining)
compressed = reader.read_bytes(read_size)
if len(compressed) != read_size:
raise EOFError("Unexpected EOF while reading LZMA bundle block")
remaining -= read_size
if decompressor.eof:
continue
while True:
max_length = min(
1024 * 1024,
int(block_info.uncompressedSize) - written + 1,
)
decompressed = decompressor.decompress(compressed, max_length=max_length)
if decompressed:
written += len(decompressed)
if written > block_info.uncompressedSize:
raise ValueError(
f"LZMA bundle block exceeds its declared size of {block_info.uncompressedSize}"
)
output.write(decompressed)
compressed = b""
if decompressor.eof or decompressor.needs_input:
break
if written != block_info.uncompressedSize:
raise ValueError(
f"LZMA bundle block size mismatch: expected {block_info.uncompressedSize}, got {written}"
)
return
decompressed_block = self.decompress_data(
reader.read_bytes(block_info.compressedSize),
block_info.uncompressedSize,
block_info.flags,
index,
)
if decompressed_block is not None:
output.write(decompressed_block)
def _create_temp_backed_blocks_reader(
self,
reader: EndianBinaryReader,
blocks_info: list[BlockInfo],
*,
offset: int,
):
self._cleanup_temp_blocks_storage()
tmp_file = tempfile.NamedTemporaryFile(
mode="w+b",
prefix="UnityPy_bundle_blocks_",
suffix=".tmp",
delete=True,
)
tmp_path = tmp_file.name
try:
for index, block_info in enumerate(blocks_info):
self._write_decompressed_block(reader, block_info, index, tmp_file)
tmp_file.flush()
tmp_file.seek(0)
if tmp_file.seek(0, os.SEEK_END) == 0:
tmp_file.close()
return EndianBinaryReader(b"", offset=offset)
tmp_file.seek(0)
mmap_obj = mmap.mmap(tmp_file.fileno(), 0, access=mmap.ACCESS_READ)
except Exception:
try:
tmp_file.close()
finally:
try:
os.remove(tmp_path)
except OSError:
pass
raise
self._blocks_tmp_path = tmp_path
self._blocks_tmp_file = tmp_file
self._blocks_mmap = mmap_obj
return EndianBinaryReader(memoryview(mmap_obj), offset=offset)
def read_web_raw(self, reader: EndianBinaryReader):
# def read_header_and_blocks_info(self, reader:EndianBinaryReader):
version = self.version
if version >= 4:
self._hash = reader.read_bytes(16)
self.crc = reader.read_u_int()
minimumStreamedBytes = reader.read_u_int() # noqa: F841
headerSize = reader.read_u_int()
numberOfLevelsToDownloadBeforeStreaming = reader.read_u_int() # noqa: F841
levelCount = reader.read_int()
reader.Position += 4 * 2 * (levelCount - 1)
compressedSize = reader.read_u_int()
uncompressedSize = reader.read_u_int() # noqa: F841
if version >= 2:
completeFileSize = reader.read_u_int() # noqa: F841
if version >= 3:
fileInfoHeaderSize = reader.read_u_int() # noqa: F841
reader.Position = headerSize
uncompressedBytes = reader.read_bytes(compressedSize)
if self.signature == "UnityWeb":
uncompressedBytes = CompressionHelper.decompress_lzma(uncompressedBytes, True)
blocksReader = EndianBinaryReader(uncompressedBytes, offset=headerSize)
nodesCount = blocksReader.read_int()
m_DirectoryInfo = [
File.DirectoryInfo(
blocksReader.read_string_to_null(), # path
blocksReader.read_u_int(), # offset
blocksReader.read_u_int(), # size
)
for _ in range(nodesCount)
]
return m_DirectoryInfo, blocksReader
def read_fs(self, reader: EndianBinaryReader):
size = reader.read_long() # noqa: F841
# header
compressedSize = reader.read_u_int()
uncompressedSize = reader.read_u_int()
dataflagsValue = reader.read_u_int()
# UnityWeb version 6
if self.signature != "UnityFS":
reader.read_byte()
version = self.parse_version()
# https://issuetracker.unity3d.com/issues/files-within-assetbundles-do-not-start-on-aligned-boundaries-breaking-patching-on-nintendo-switch
# Unity CN introduced encryption before the alignment fix was introduced.
# Unity CN used the same flag for the encryption as later on the alignment fix,
# so we have to check the version to determine the correct flag set.
if (
version < (2020,)
or (version[0] == 2020 and version < (2020, 3, 34))
or (version[0] == 2021 and version < (2021, 3, 2))
or (version[0] == 2022 and version < (2022, 1, 1))
):
self.dataflags = ArchiveFlagsOld(dataflagsValue)
else:
self.dataflags = ArchiveFlags(dataflagsValue)
if self.dataflags & self.dataflags.UsesAssetBundleEncryption:
self.decryptor = ArchiveStorageManager.ArchiveStorageDecryptor(reader)
# if header version is 7 or later we need to align the reader
# for 2019.4.15 and later, version should be 7 and aligned
# but some games in these versions somehow has version 6 while aligned
if self.version >= 7 or (version[0] == 2019 and version >= (2019, 4, 15)):
reader.align_stream(16)
self._uses_block_alignment = True
start = reader.Position
if self.dataflags & ArchiveFlags.BlocksInfoAtTheEnd: # kArchiveBlocksInfoAtTheEnd
reader.Position = reader.Length - compressedSize
blocksInfoBytes = reader.read_bytes(compressedSize)
reader.Position = start
else: # 0x40 kArchiveBlocksAndDirectoryInfoCombined
blocksInfoBytes = reader.read_bytes(compressedSize)
blocksInfoBytes = self.decompress_data(blocksInfoBytes, uncompressedSize, self.dataflags)
blocksInfoReader = EndianBinaryReader(blocksInfoBytes, offset=start)
uncompressedDataHash = blocksInfoReader.read_bytes(16) # noqa: F841
blocksInfoCount = blocksInfoReader.read_int()
m_BlocksInfo = [
BlockInfo(
blocksInfoReader.read_u_int(), # uncompressedSize
blocksInfoReader.read_u_int(), # compressedSize
blocksInfoReader.read_u_short(), # flags
)
for _ in range(blocksInfoCount)
]
nodesCount = blocksInfoReader.read_int()
m_DirectoryInfo = [
DirectoryInfoFS(
blocksInfoReader.read_long(), # offset
blocksInfoReader.read_long(), # size
blocksInfoReader.read_u_int(), # flags
blocksInfoReader.read_string_to_null(), # path
)
for _ in range(nodesCount)
]
if m_BlocksInfo:
self._block_info_flags = m_BlocksInfo[0].flags
if isinstance(self.dataflags, ArchiveFlags) and self.dataflags & ArchiveFlags.BlockInfoNeedPaddingAtStart:
reader.align_stream(16)
blocksReader = self._create_temp_backed_blocks_reader(
reader,
m_BlocksInfo,
offset=(blocksInfoReader.real_offset()),
)
return m_DirectoryInfo, blocksReader
def _write_header(self, writer: EndianBinaryWriter):
"""Write the common bundle file header fields."""
writer.write_string_to_null(self.signature)
writer.write_u_int(self.version)
writer.write_string_to_null(self.version_player)
writer.write_string_to_null(self.version_engine)
def _dispatch_save(self, writer: EndianBinaryWriter, packer=None):
"""Dispatch save to the correct format handler based on signature and packer."""
if self.signature == "UnityArchive":
raise NotImplementedError("BundleFile - UnityArchive")
elif self.signature in ["UnityWeb", "UnityRaw"]:
if self.version == 6:
self.save_fs(writer, 64, 64)
else:
self.save_web_raw(writer)
elif self.signature == "UnityFS":
if not packer or packer == "none":
self.save_fs(writer, 64, 64)
elif packer == "original":
self.save_fs(
writer,
data_flag=self.dataflags,
block_info_flag=self._block_info_flags,
)
elif packer == "lz4":
self.save_fs(writer, data_flag=194, block_info_flag=2)
elif packer == "lzma":
self.save_fs(writer, data_flag=65, block_info_flag=1)
elif isinstance(packer, tuple):
self.save_fs(writer, *packer)
else:
raise NotImplementedError("UnityFS - Packer:", packer)
def save(self, packer=None):
"""
Rewrites the BundleFile and returns it as bytes object.
packer:
can be either one of the following strings
or tuple consisting of (block_info_flag, data_flag)
allowed strings:
none - no compression, default, safest bet
lz4 - lz4 compression
original - uses the original flags
"""
writer = EndianBinaryWriter()
self._write_header(writer)
self._dispatch_save(writer, packer)
return writer.bytes
def save_to(self, path, packer=None):
"""Save directly to a file, avoiding the final in-memory bytes copy.
Returns the size of the written file in bytes.
packer: same options as save().
"""
with open(path, "wb") as f:
writer = EndianBinaryWriter(f)
self._write_header(writer)
self._dispatch_save(writer, packer)
return os.path.getsize(path)
def save_fs(self, writer: EndianBinaryWriter, data_flag: int, block_info_flag: int):
# Detect whether the writer is backed by a real file (save_to)
# or an in-memory BytesIO (save). When file-backed we can use
# temp files to avoid holding multi-GB compressed payloads in RAM.
is_file_backed = not isinstance(writer.stream, io.BytesIO)
# remove encryption flag, as encryption is not applied by UnityPy during save
if block_info_flag & self.dataflags.UsesAssetBundleEncryption:
block_info_flag ^= self.dataflags.UsesAssetBundleEncryption
if data_flag & self.dataflags.UsesAssetBundleEncryption:
data_flag ^= self.dataflags.UsesAssetBundleEncryption
files = []
temp_replacers: list[TempFileReplacer] = []
compressed_tmp_path = None
def cleanup_temp_files():
for replacer in temp_replacers:
replacer.cleanup()
if compressed_tmp_path:
try:
os.remove(compressed_tmp_path)
except OSError:
pass
def build_replacer(name: str, f) -> Replacer:
original_info = self._directory_info_map.get(name)
original_ref = getattr(self, "_original_file_refs", {}).get(name)
if (
original_info is not None
and self._blocks_reader is not None
and original_ref is not None
and f is original_ref()
and not getattr(f, "is_changed", False)
):
return SourceSliceReplacer.from_reader(
self._blocks_reader,
int(original_info.offset),
int(original_info.size),
)
if isinstance(f, EndianBinaryReader):
return SourceSliceReplacer.from_reader(f, 0, f.Length)
if isinstance(f, EndianBinaryWriter):
return SourceSliceReplacer.from_writer(f)
if is_file_backed and hasattr(f, "save_to"):
tmp_fd, tmp_path = tempfile.mkstemp(prefix="unitypy_bundle_entry_", suffix=".bin")
os.close(tmp_fd)
try:
f.save_to(tmp_path)
replacer = TempFileReplacer(
tmp_path,
os.path.getsize(tmp_path),
delete_on_cleanup=True,
)
except BaseException:
try:
os.remove(tmp_path)
except OSError:
pass
raise
temp_replacers.append(replacer)
return replacer
return BytesReplacer(f.save())
file_entries: list[tuple[str, int, Replacer]] = []
try:
for name, f in self.files.items():
replacer = build_replacer(name, f)
file_entries.append((name, getattr(f, "flags", 0), replacer))
files.append((name, getattr(f, "flags", 0), len(replacer)))
except BaseException:
cleanup_temp_files()
raise
def iter_file_data():
for _name, _flags, replacer in file_entries:
yield from replacer.iter_chunks()
# Compress file payloads. When file-backed, write compressed
# output to a temp file to avoid a huge in-memory bytearray.
file_data_chunks = iter_file_data()
try:
try:
if is_file_backed:
_cfd, compressed_tmp_path = tempfile.mkstemp()
os.close(_cfd)
block_info = CompressionHelper.chunk_based_compress_iter_to_file(
file_data_chunks, block_info_flag, compressed_tmp_path
)
else:
file_data, block_info = CompressionHelper.chunk_based_compress_iter(
file_data_chunks, block_info_flag
)
finally:
file_data_chunks.close()
except BaseException:
cleanup_temp_files()
raise
try:
# write the block_info
# uncompressedDataHash
block_writer = EndianBinaryWriter(b"\x00" * 0x10)
# data block info
block_writer.write_int(len(block_info))
for block_uncompressed_size, block_compressed_size, block_flag in block_info:
block_writer.write_u_int(block_uncompressed_size)
block_writer.write_u_int(block_compressed_size)
block_writer.write_u_short(block_flag)
# file block info
if not data_flag & 0x40:
raise NotImplementedError("UnityPy always writes DirectoryInfo, so data_flag must include 0x40")
block_writer.write_int(len(files))
offset = 0
for f_name, f_flag, f_len in files:
block_writer.write_long(offset)
block_writer.write_long(f_len)
offset += f_len
block_writer.write_u_int(f_flag)
block_writer.write_string_to_null(f_name)
# compress the block data
block_data = block_writer.bytes
block_writer.dispose()
uncompressed_block_data_size = len(block_data)
switch = data_flag & 0x3F
if switch in CompressionHelper.COMPRESSION_MAP:
block_data = CompressionHelper.COMPRESSION_MAP[switch](block_data)
else:
raise NotImplementedError(
f"No compression function in the CompressionHelper.COMPRESSION_MAP for {switch}"
)
compressed_block_data_size = len(block_data)
# write the header info
writer_header_pos = writer.Position
writer.write_long(0)
writer.write_u_int(compressed_block_data_size)
writer.write_u_int(uncompressed_block_data_size)
writer.write_u_int(data_flag)
# UnityWeb version 6
if self.signature != "UnityFS":
writer.write_byte(0)
if self._uses_block_alignment:
writer.align_stream(16)
def _write_file_data():
"""Write the compressed file data to writer."""
if compressed_tmp_path:
with open(compressed_tmp_path, "rb") as cf:
while True:
chunk = cf.read(1048576)
if not chunk:
break
writer.write(chunk)
else:
writer.write(file_data)
if data_flag & 0x80: # at end of file
if data_flag & 0x200:
writer.align_stream(16)
_write_file_data()
writer.write(block_data)
else:
writer.write(block_data)
if data_flag & 0x200:
writer.align_stream(16)
_write_file_data()
writer_end_pos = writer.Position
writer.Position = writer_header_pos
# correct file size
writer.write_long(writer_end_pos)
writer.Position = writer_end_pos
finally:
cleanup_temp_files()
def save_web_raw(self, writer: EndianBinaryWriter):
# (version >= 4) hash
# (version >= 4) crc
# minimumStreamedBytes
# headerSize
# numberOfLevelsToDownloadBeforeStreaming
# levelCount
# compressedSize * levelCount
# uncompressedSize * levelCount
# (version >= 2) completeFileSize
# (version >= 3) file_info_header_size
# compressed assets
if self.version > 3:
raise NotImplementedError("Saving Unity Web bundles with version > 3 is not supported")
# Calculate fileInfoHeaderSize for set offsets
file_info_header_size = 4 # for nodesCount
for file_name in self.files.keys():
file_info_header_size += len(file_name.encode()) + 1 # +1 for null terminator
file_info_header_size += 4 * 2 # 4 bytes each for offset and size
file_info_header_padding_size = 4 - (file_info_header_size % 4) if file_info_header_size % 4 != 0 else 0
file_info_header_size += file_info_header_padding_size
# Prepare directory info
directory_info_writer = EndianBinaryWriter()
directory_info_writer.write_int(len(self.files)) # nodesCount
file_content_writer = EndianBinaryWriter()
current_offset = file_info_header_size
for file_name, f in self.files.items():
directory_info_writer.write_string_to_null(file_name)
directory_info_writer.write_u_int(current_offset)
# Get file content
if isinstance(f, (EndianBinaryReader, EndianBinaryWriter)):
file_data = f.bytes
else:
file_data = f.save()
file_size = len(file_data)
directory_info_writer.write_u_int(file_size)
file_content_writer.write_bytes(file_data)
current_offset += file_size
directory_info_writer.write(b"\x00" * file_info_header_padding_size)
uncompressed_directory_info = directory_info_writer.bytes
directory_info_writer.dispose()
uncompressed_file_content = file_content_writer.bytes
file_content_writer.dispose()
# Combine directory info and file content
uncompressed_content = uncompressed_directory_info + uncompressed_file_content
compressed_content = uncompressed_content
if self.signature == "UnityWeb":
compressed_content = CompressionHelper.compress_lzma(uncompressed_content, True)
# Write header
header_size = writer.Position + 24 # assuming levelCount = 1
if self.version >= 2:
header_size += 4
if self.version >= 3:
header_size += 4
if self.version >= 4:
header_size += 20
# pad to multiple of 4
header_size = (header_size + 3) & ~3
if self.version >= 4:
writer.write_bytes(self._hash)
writer.write_u_int(self.crc)
writer.write_u_int(header_size + len(compressed_content)) # minimumStreamedBytes (same as completeFileSize)
writer.write_u_int(header_size) # headerSize
writer.write_u_int(1) # numberOfLevelsToDownloadBeforeStreaming (always 1)
writer.write_int(1) # levelCount (always 1)
writer.write_u_int(len(compressed_content)) # compressedSize
writer.write_u_int(len(uncompressed_content)) # uncompressedSize
if self.version >= 2:
writer.write_u_int(header_size + len(compressed_content)) # completeFileSize
if self.version >= 3:
writer.write_u_int(file_info_header_size) # file_info_header_size
# align header
writer.align_stream(4)
# Write compressed content
writer.write(compressed_content)
def decompress_data(
self,
compressed_data: bytes,
uncompressed_size: int,
flags: Union[int, ArchiveFlags, ArchiveFlagsOld],
index: int = 0,
) -> bytes:
"""
Parameters
----------
compressed_data : bytes
The compressed data.
uncompressed_size : int
The uncompressed size of the data.
flags : int
The flags of the data.
Returns
-------
bytes
The decompressed data."""
comp_flag = CompressionFlags(flags & ArchiveFlags.CompressionTypeMask)
if self.decryptor is not None and flags & 0x100 and comp_flag != CompressionFlags.NONE:
compressed_data = self.decryptor.decrypt_block(compressed_data, index)
if comp_flag in CompressionHelper.DECOMPRESSION_MAP:
return cast(
bytes,
CompressionHelper.DECOMPRESSION_MAP[comp_flag](compressed_data, uncompressed_size),
)
else:
raise ValueError(f"Unknown compression! flag: {flags}, compression flag: {comp_flag.value}")
def parse_version(self) -> UnityVersion:
"""Returns the version as a tuple."""
version = None
version_str = self.version_engine
try:
version = UnityVersion.from_str(version_str)
except ValueError:
pass
if version is None or version.major == 0:
version_str = config.get_fallback_version()
version = UnityVersion.from_str(version_str)
return version