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# TODO: implement encryption for saving files
from collections import namedtuple
import re
from typing import Tuple, Union
from . import File
from ..enums import ArchiveFlags, ArchiveFlagsOld, CompressionFlags
from ..helpers import ArchiveStorageManager, CompressionHelper
from ..streams import EndianBinaryReader, EndianBinaryWriter
from .. import config
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: Tuple[ArchiveFlags, ArchiveFlagsOld]
decryptor: ArchiveStorageManager.ArchiveStorageDecryptor = None
_uses_block_alignment: bool = False
def __init__(self, reader: EndianBinaryReader, parent: File, name: str = None):
super().__init__(parent=parent, name=name)
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"]:
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.read_files(blocksReader, m_DirectoryInfo)
def read_web_raw(self, reader: EndianBinaryReader):
# def read_header_and_blocks_info(self, reader:EndianBinaryReader):
version = self.version
if version >= 4:
_hash = reader.read_bytes(16)
crc = reader.read_u_int()
minimumStreamedBytes = reader.read_u_int()
headerSize = reader.read_u_int()
numberOfLevelsToDownloadBeforeStreaming = reader.read_u_int()
levelCount = reader.read_int()
reader.Position += 4 * 2 * (levelCount - 1)
compressedSize = reader.read_u_int()
uncompressedSize = reader.read_u_int()
if version >= 2:
completeFileSize = reader.read_u_int()
if version >= 3:
fileInfoHeaderSize = reader.read_u_int()
reader.Position = headerSize
uncompressedBytes = CompressionHelper.decompress_lzma(
reader.read_bytes(compressedSize)
)
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()
# header
compressedSize = reader.read_u_int()
uncompressedSize = reader.read_u_int()
self.dataflags = reader.read_u_int()
version = self.get_version_tuple()
# 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(self.dataflags)
else:
self.dataflags = ArchiveFlags(self.dataflags)
if self.dataflags & self.dataflags.UsesAssetBundleEncryption:
self.decryptor = ArchiveStorageManager.ArchiveStorageDecryptor(reader)
# check if we need to align the reader
# - align to 16 bytes and check if all are 0
# - if not, reset the reader to the previous position
if self.version >= 7:
reader.align_stream(16)
self._uses_block_alignment = True
elif version >= (2019, 4):
pre_align = reader.Position
align_data = reader.read((16 - pre_align % 16) % 16)
if any(align_data):
reader.Position = pre_align
else:
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)
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 = EndianBinaryReader(
b"".join(
self.decompress_data(
reader.read_bytes(blockInfo.compressedSize),
blockInfo.uncompressedSize,
blockInfo.flags,
i,
)
for i, blockInfo in enumerate(m_BlocksInfo)
),
offset=(blocksInfoReader.real_offset()),
)
return m_DirectoryInfo, blocksReader
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
"""
# file_header
# signature (string_to_null)
# format (int)
# version_player (string_to_null)
# version_engine (string_to_null)
writer = EndianBinaryWriter()
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)
if self.signature == "UnityArchive":
raise NotImplementedError("BundleFile - UnityArchive")
elif self.signature in ["UnityWeb", "UnityRaw"]:
raise NotImplementedError(
"Saving Unity Web and Raw bundles isn't supported yet"
)
# 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._data_flags,
block_info_flag=self._block_info_flags,
)
elif packer == "lz4":
self.save_fs(writer, data_flag=194, block_info_flag=2)
elif isinstance(packer, tuple):
self.save_fs(writer, *packer)
else:
raise NotImplementedError("UnityFS - Packer:", packer)
return writer.bytes
def save_fs(self, writer: EndianBinaryWriter, data_flag: int, block_info_flag: int):
# header
# compressed blockinfo (block details & directionary)
# compressed assets
# 0b1000000 / 0b11000000 | 64 / 192 - uncompressed
# 0b11000010 | 194 - lz4
# block_info_flag
# 0 / 0b1000000 | 0 / 64 - uncompressed
# 0b1 | 1 - lzma
# 0b10 | 2 - lz4
# 0b11 | 3 - lz4hc [not implemented]
# 0b100 | 4 - lzham [not implemented]
# data_flag
# header:
# bundle_size (long)
# compressed_size (int)
# uncompressed_size (int)
# flag (int)
# ?padding? (bool)
# This will be written at the end,
# because the size can only be calculated after the data compression,
# block_info:
# *flag & 0x80 ? at the end : right after header
# *decompression via flag & 0x3F
# *read compressed_size -> uncompressed_size
# 0x10 offset
# *read blocks infos of the data stream
# count (int)
# (
# uncompressed_size(uint)
# compressed_size (uint)
# flag(short)
# )
# *decompression via info.flag & 0x3F
# *afterwards the file positions
# file_count (int)
# (
# offset (long)
# size (long)
# flag (int)
# name (string_to_null)
# )
# file list & file data
# prep nodes and build up block data
data_writer = EndianBinaryWriter()
files = [
(
name,
f.flags,
data_writer.write_bytes(
f.bytes
if isinstance(f, (EndianBinaryReader, EndianBinaryWriter))
else f.save()
),
)
for name, f in self.files.items()
]
file_data = data_writer.bytes
data_writer.dispose()
uncompressed_data_size = len(file_data)
# compress the data
switch = block_info_flag & 0x3F
if switch == 1: # LZMA
file_data = CompressionHelper.compress_lzma(file_data)
elif switch in [2, 3]: # LZ4, LZ4HC
file_data = CompressionHelper.compress_lz4(file_data)
elif switch == 4: # LZHAM
raise NotImplementedError
# else no compression - data stays the same
compressed_data_size = len(file_data)
# write the block_info
# uncompressedDataHash
block_writer = EndianBinaryWriter(b"\x00" * 0x10)
# data block info
# block count
block_writer.write_int(1)
# uncompressed size
block_writer.write_u_int(uncompressed_data_size)
# compressed size
block_writer.write_u_int(compressed_data_size)
# flag
block_writer.write_u_short(block_info_flag)
# file block info
if not data_flag & 0x40:
raise NotImplementedError(
"UnityPy always writes DirectoryInfo, so data_flag must include 0x40"
)
# file count
block_writer.write_int(len(files))
offset = 0
for f_name, f_flag, f_len in files:
# offset
block_writer.write_long(offset)
# size
block_writer.write_long(f_len)
offset += f_len
# flag
block_writer.write_u_int(f_flag)
# name
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 == 1: # LZMA
block_data = CompressionHelper.compress_lzma(block_data)
elif switch in [2, 3]: # LZ4, LZ4HC
block_data = CompressionHelper.compress_lz4(block_data)
elif switch == 4: # LZHAM
raise NotImplementedError
compressed_block_data_size = len(block_data)
# write the header info
## file size - 0 for now, will be set at the end
writer_header_pos = writer.Position
writer.write_long(0)
# compressed blockInfoBytes size
writer.write_u_int(compressed_block_data_size)
# uncompressed size
writer.write_u_int(uncompressed_block_data_size)
# compression and file layout flag
writer.write_u_int(data_flag)
if self._uses_block_alignment:
# UnityFS\x00 - 8
# size 8
# comp sizes 4+4
# flag 4
# sum : 28 -> +8 alignment
writer.align_stream(16)
if data_flag & 0x80: # at end of file
if data_flag & 0x200:
writer.align_stream(16)
writer.write(file_data)
writer.write(block_data)
else:
writer.write(block_data)
if data_flag & 0x200:
writer.align_stream(16)
writer.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
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 comp_flag == CompressionFlags.LZMA: # LZMA
return CompressionHelper.decompress_lzma(compressed_data)
elif comp_flag in [CompressionFlags.LZ4, CompressionFlags.LZ4HC]: # LZ4, LZ4HC
if self.decryptor is not None and flags & 0x100:
compressed_data = self.decryptor.decrypt_block(compressed_data, index)
return CompressionHelper.decompress_lz4(compressed_data, uncompressed_size)
elif comp_flag == CompressionFlags.LZHAM: # LZHAM
raise NotImplementedError("LZHAM decompression not implemented")
else:
return compressed_data
def get_version_tuple(self) -> Tuple[int, int, int]:
"""Returns the version as a tuple."""
version = self.version_engine
if not version or version == "0.0.0":
version = config.get_fallback_version()
return tuple(map(int, reVersion.match(version).groups()))