# SARC archives are used in the Dreamcast port of the game under .bin file extension, usually for cars

import struct

sarc_file_header_format = "<4sI"

sarc_file_header = {

"Signature": b"SARC",

"File Count": 0

}

sarc_packed_file_header_format = "<4xIII256s"

sarc_packed_file_header = {

"File Size": 0,

"File Size 2": 0,

"File Offset": 0,

"File Path": ""

}

class SARC:

def __init__(self):

self.file_header = {}

self.packed_file_header_list = []

self.file_bytes_list = []

def unpack_from_bytes(self, sarc_bytes):

if sarc_bytes[:4] != b"SARC":

raise ValueError("Input file is not a SARC archive")

file_header_values = struct.unpack(sarc_file_header_format, sarc_bytes[:8])

self.file_header = dict(zip(sarc_file_header.keys(), file_header_values))

# print(self.file_header)

for i in range(self.file_header["File Count"]):

packed_file_header_values = struct.unpack(sarc_packed_file_header_format,

sarc_bytes[8 + i * 272: 8 + 272 + i * 272])

packed_file_header = dict(zip(sarc_packed_file_header.keys(), packed_file_header_values))

self.packed_file_header_list.append(packed_file_header)

file_offset = packed_file_header["File Offset"]

file_size = packed_file_header["File Size"]

file_bytes = sarc_bytes[file_offset:file_offset + file_size]

self.file_bytes_list.append(file_bytes)

def unpack_from_file(self, path_to_sarc):

sarc_bytes = open(path_to_sarc, "r+b").read()

self.unpack_from_bytes(sarc_bytes)

def save_files_to_folder(self, output_folder):

for i in range(self.file_header["File Count"]):

file_path = self.packed_file_header_list[i]["File Path"] # 255 bytes

file_name = file_path[:file_path.find(b'\x00')] # Remove the padding at the end

file_name = file_name.decode("cp932") # Decode text

file_name = file_name[file_name.rfind('\\') + 1:] # Keep only the name of the file

file_bytes = self.file_bytes_list[i]

output_file = open(output_folder + file_name, "w+b")

output_file.write(file_bytes)

print("Saved " + output_folder + file_name)

def extract_sarc(input_archive_path, output_folder):

sarc_archive = SARC()

sarc_archive.unpack_from_file(input_archive_path)

sarc_archive.save_files_to_folder(output_folder)