mwl2bin.py

import os, sys

# create directories and stuff
if not os.path.isdir("lvl"):
    os.mkdir("lvl")

if not os.path.isdir("lvl/obj"):
    os.mkdir("lvl/obj")

if not os.path.isdir("lvl/spr"):
    os.mkdir("lvl/spr")

# read mwl data
with open(sys.argv[1], "rb") as mwl:
    data = mwl.read()

removepath = os.path.basename(sys.argv[1])
filename = os.path.splitext(removepath)[0]

# ----------------
# level data - obj
# ----------------

data_headerless = data[200:]
obj_datasplit = data_headerless.split(b"\xff\x04", 1)
obj_data = obj_datasplit[0]

# -------------------------------
# level data - obj (screen exits)
# -------------------------------

warpamount = input("enter the amount of screen exits in the level: ")

if warpamount > str(0):
    print("fixing "+warpamount+" screen exit(s)...")
    
    warpdata = obj_data[-4*int(warpamount):]
    nowarpdata = obj_data[:-4*int(warpamount)]
    
    # do multiple replace checks to make sure warps are correct
    warpdatacheck1 = warpdata.replace(b"\x05\x00", b"\x00\x00") # default pipe, no sub exit
    warpdatacheck2 = warpdatacheck1.replace(b"\x07\x00", b"\x02\x00") # default pipe, sub exit
    warpdatacheck3 = warpdatacheck2.replace(b"\x0f\x00", b"\x02\x00") # default pipe, sub exit water flag (custom lunar magic value, so it gets converted to 02)
    warpdatacheck4 = warpdatacheck3.replace(b"\x0d\x00", b"\x00\x00") # default pipe, midway exit (custom lunar magic value, so it gets converted to 00)
    
    warpdatafinal = warpdatacheck4
    
    reconstructedwarps = nowarpdata+warpdatafinal
    
    print(str(warpdata)+" -> "+str(warpdatafinal))
    
    print("(hopefully) fixed screen exits: "+filename)
    
    print("converted obj: "+filename)
    
    # export finished bin
    with open("lvl/obj/"+filename+".bin", "wb") as binobj:
        binobj.write(reconstructedwarps)
        binobj.write(b"\xff")

if warpamount == str(0):
    print("0 screen exits, fixing skipped!")
    print("converted obj: "+filename)
    
    # export finished bin
    with open("lvl/obj/"+filename+".bin", "wb") as binobj:
        binobj.write(obj_data)
        binobj.write(b"\xff")

# ----------------
# level data - spr
# ----------------

data_objremove = data.split(b"\xff\x04", 1)
data_objless = data_objremove[1]

data_sprstart = data_objless[2063:]

spr_datasplit = data_sprstart.split(b"\xff", 1)
spr_data = spr_datasplit[0]

print("converted spr: "+filename)

# export finished bin
with open("lvl/spr/"+filename+".bin", "wb") as binspr:
    binspr.write(spr_data)
    binspr.write(b"\xff")

input("press enter to exit!")