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@lgolubyev
Last active May 26, 2021 13:55
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import lz4.block
import sys
import struct
import os
def print_usage_and_exit():
sys.exit("usage: py .\\decompressor.py target_path")
cwd = os.path.abspath(os.getcwd())
def decompress(filePath):
input_filepath = filePath
output_path = os.path.join("extracted", "");
if(not os.path.exists(output_path)):
os.mkdir(output_path)
output_filepath = os.path.join(output_path, os.path.basename(filePath))
header_expected_magic = b'XALZ'
with open(input_filepath, "rb") as xalz_file:
data = xalz_file.read()
if data[:4] != header_expected_magic:
sys.exit("The input file does not contain the expected magic bytes, aborting ...")
header_index = data[4:8]
header_uncompressed_length = struct.unpack('<I', data[8:12])[0]
payload = data[12:]
print("header index: %s" % header_index)
print("compressed payload size: %s bytes" % len(payload))
print("uncompressed length according to header: %s bytes" % header_uncompressed_length)
decompressed = lz4.block.decompress(payload, uncompressed_size=header_uncompressed_length)
with open(output_filepath, "wb") as output_file:
output_file.write(decompressed)
output_file.close()
print("result written to file")
if __name__ == "__main__":
n = 0
for file in os.listdir(cwd):
try:
if(file.endswith(".dll")):
decompress(file)
n += 1;
except:
print("failed to decompress " + os.path.basename(file))
print("\\nDecompressed ", n, " assemblies!")
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