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226 lines (194 loc) · 7.94 KB
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from typing import Tuple, Union
from . import File
from .BlockStream import BlockStream
from ..enums import ArchiveFlags, ArchiveFlagsOld, CompressionFlags
from ..helpers import ArchiveStorageManager, CompressionHelper
from ..streams import EndianBinaryReader, EndianBinaryWriter
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, **kwargs
):
super().__init__(parent=parent, name=name, **kwargs)
self.blocksReader = None
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()
dry_run = kwargs.get("dry_run", False)
if signature == "UnityArchive":
raise NotImplementedError("BundleFile - UnityArchive")
elif signature in ["UnityWeb", "UnityRaw"]:
self.blocksReader = self.read_web_raw(reader)
elif signature == "UnityFS":
self.blocksReader = self.read_fs(reader, **kwargs)
else:
raise NotImplementedError(f"Unknown Bundle {name} signature:\n{signature[:80]}")
if not dry_run and self.blocksReader:
self.read_files(self.blocksReader, self.blocks.m_DirectoryInfo, **kwargs)
def close(self):
if hasattr(self, "blocksReader") and self.blocksReader:
self.blocksReader.close()
self.blocksReader = None
if hasattr(self, "m_BlocksInfo"):
del self.m_BlocksInfo
if hasattr(self, "m_DirectoryInfo"):
del self.m_DirectoryInfo
super().close()
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.crc32 = 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()
self.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 blocksReader
def read_fs(self, reader: EndianBinaryReader, dry_run: bool = False, **kwargs):
#assert reader != None, "Unity file system reader must be set"
self.blocks = BlockStream(
reader, reader.Position, reader.Length,
version=self.version, unity_version=self.version_engine,
**kwargs
)
self.blocks.read_meta()
if kwargs.get("dry_run", False):
reader.close()
return None
return self.blocks
def save(self, packer=None, writer=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)
"""
if writer is None:
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,
meta_flags=CompressionFlags.META_UNCOMPRESSED,
block_flags=CompressionFlags.NO)
elif packer == "none+original":
self.save_fs(writer)
elif packer == "lz4+original":
self.save_fs(
writer,
meta_flags=self.blocks._fs_flags,
block_flags=CompressionFlags.LZ4HC)
elif packer == "original":
self.save_fs(
writer,
meta_flags=self.blocks._fs_flags,
block_flags=self.blocks._blocks_info_flag)
elif packer == "lz4":
self.save_fs(writer,
meta_flags=CompressionFlags.META_LZ4,
block_flags=CompressionFlags.LZ4HC)
elif isinstance(packer, tuple):
self.save_fs(writer, *packer)
else:
raise NotImplementedError(f"UnityFS: packer \"{packer}\" not implemented")
return writer
def save_fs(self, writer: EndianBinaryWriter, meta_flags: int=None, block_flags: int=None, block_size:int=-1):
""" Saves UnityFS format file """
"""
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
0b100 | 4 - lzham
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
"""
self.blocks.write_meta_and_files(writer, self.files.items(), meta_flags, block_flags, block_size)
#writer.close()