getentities.py

#!/usr/bin/python3

import struct
import sys
import operator

dirent = struct.Struct("<II")

def getEntities(fd):
	fd.seek(8)
	offset, length = dirent.unpack(fd.read(8))
	fd.seek(offset)
	return fd.read(length)

if __name__ == "__main__":
	if len(sys.argv) != 2:
		print("Usage: {0:s} <file.bsp>".format(sys.argv[0]))
		sys.exit(1)

	with open(sys.argv[1], "rb") as fd:
		print(str(getEntities(fd), "US-ASCII"))