LZ4 decompession failed

[smpial]

Code

import os
import UnityPy


UnityPy.config.FALLBACK_UNITY_VERSION = '2022.3.52f1'

env = UnityPy.load('avgbg_assets_bg0001_q_15caadfac7a047db4ea676ea62806d56.bundle')
for obj in env.objects:
    print(obj.type.name)
print('End')

Error

C:\Users\user\AppData\Local\Programs\Python\Python310\lib\site-packages\UnityPy\files\BundleFile.py:526: UnityVersionFallbackWarning: No valid Unity version found, defaulting to UnityPy.config.FALLBACK_UNITY_VERSION (2022.3.52f1)
  version_str = config.get_fallback_version()
Traceback (most recent call last):
  File "E:\code\unity_unpack\test.py", line 7, in <module>
    env = UnityPy.load('avgbg_assets_bg0001_q_15caadfac7a047db4ea676ea62806d56.bundle')
  File "C:\Users\user\AppData\Local\Programs\Python\Python310\lib\site-packages\UnityPy\environment.py", line 63, in __init__
    self.load_file(arg)
  File "C:\Users\user\AppData\Local\Programs\Python\Python310\lib\site-packages\UnityPy\environment.py", line 152, in load_file
    f = parse_file(reader, self, name=stream_name, typ=typ, is_dependency=is_dependency)
  File "C:\Users\user\AppData\Local\Programs\Python\Python310\lib\site-packages\UnityPy\helpers\ImportHelper.py", line 141, in parse_file
    f = files.BundleFile(reader, parent, name=name, is_dependency=is_dependency)
  File "C:\Users\user\AppData\Local\Programs\Python\Python310\lib\site-packages\UnityPy\files\BundleFile.py", line 46, in __init__
    m_DirectoryInfo, blocksReader = self.read_fs(reader)
  File "C:\Users\user\AppData\Local\Programs\Python\Python310\lib\site-packages\UnityPy\files\BundleFile.py", line 174, in read_fs
    b"".join(
  File "C:\Users\user\AppData\Local\Programs\Python\Python310\lib\site-packages\UnityPy\files\BundleFile.py", line 175, in <genexpr>
    self.decompress_data(
  File "C:\Users\user\AppData\Local\Programs\Python\Python310\lib\site-packages\UnityPy\files\BundleFile.py", line 511, in decompress_data
    CompressionHelper.DECOMPRESSION_MAP[comp_flag](compressed_data, uncompressed_size),
  File "C:\Users\user\AppData\Local\Programs\Python\Python310\lib\site-packages\UnityPy\helpers\CompressionHelper.py", line 94, in decompress_lz4
    return lz4.block.decompress(data, uncompressed_size)
_block.LZ4BlockError: Decompression failed: corrupt input or insufficient space in destination buffer. Error code: 33627

Bug
Lib should load file, but raises an exception

To Reproduce

• a copy of the file that causes the problem: https://drive.google.com/file/d/1RGDOKK8aX119fpFJ8Jhz2JpnWTkrWDDD/view?usp=sharing
• following data:
  • Python version: 3.10.11
  • UnityPy version: 1.24.1

[isHarryh]

Maybe the bundle file is not complete. It seems like some bytes are missing in the end of file.

The decompression error occurred at the last LZ4HC block of the file. The following image shows why and where the decompression error occurred.

Left: LZ4 block decompression code implemented in Python; Right: Your file.

Reads more about LZ4 block: https://github.com/lz4/lz4/blob/c609c16aed95ed339e142535b1b270e7b9e24ac1/doc/lz4_Block_format.md#lz4-block-format-description