gistfile1.py

# all <3 to http://mce.do.am/forum/25-36-1
import sys
import os


def read_int(fin, count):
	return int.from_bytes(fin.read(count), byteorder="little")


def read_uint32(fin):
	return read_int(fin, 4)


PADDING = 0x800


def main():
	if len(sys.argv) != 3:
		print("Usage: deuni.py source.uni output-dir/")
		return

	fin = open(sys.argv[1], "rb")
	if fin.read(4) != b"UNI2":
		print("Invalid file")
		return

	unk = fin.read(4)
	files_count = read_uint32(fin)
	table_start = read_uint32(fin) * PADDING
	data_start = read_uint32(fin) * PADDING

	fin.seek(table_start)
	files = []
	for x in range(files_count):
		unk = read_uint32(fin)
		sector_start = read_uint32(fin)
		sector_size = read_uint32(fin)
		file_size = read_uint32(fin)
		file_start = data_start + sector_start * PADDING

		files.append((file_start, file_size))

	num = 0
	for file_start, file_size in files:
		fin.seek(file_start)
		fout = open(os.path.join(sys.argv[2], str(num)), "wb")
		fout.write(fin.read(file_size))
		fout.close()

		num += 1

if __name__ == "__main__":
	main()