frostdump.py

import sys
import struct
import os
import zlib

for tfn in os.listdir("."):
    if not tfn.endswith(".idx"): continue
    fn=tfn.replace(".idx","")
    print(fn)
    datf=open(fn+".dat","rb")
    f=open(fn+".idx","rb")
    f.read(11)
    try:
        os.makedirs("dump/"+fn)
    except:
        pass
    while True:
        rec=f.read(17)
        if len(rec) < 17:
            break
        # the first word 'a' is object id the game uses to look up the object
        #ie you can repack the file with whatever offset/compression and just keep this value
        a,b,c,d,e=struct.unpack("<LLLLb", rec)
        #print("%08x %08x %08x %08x %d"%(a,b,c,d,e))
        datf.seek(d)
        buf=datf.read(b)
        if e == 1:
            buf = buf[10:]
            obj=zlib.decompressobj(-15)
            #buf = zlib.decompress(buf,-15)
            buf=obj.decompress(buf)
        resf="dump/"+fn+"/"+("%08x"%a)
        if len(buf) != c:
            print("Failed %s %d => %d(inflated) != %d (claimed)" % (resf, b, len(buf), c))
        if len(buf)<128:
            continue
        w4,h4,fmt4,unk4,w2,h2,len4=struct.unpack("<LLLLHHL",buf[0:24])
        if (not tfn.startswith("textures")) or ((w2 != w4) or (unk4 != 1)):
            fo=open(resf, "wb")
            fo.write(buf)
            continue
        #print(w4,h4,fmt4,unk4,w2,h2,len4)
        fo=open(resf + ".dds", "wb")
        fo.write(b"DDS ")
        fo.write(struct.pack("<LLLL", 0x7c, 0x1007, h4, w4))
        fo.write(bytes([0]*(16+36+4)))
        #DXT fourcc
        if fmt4!=0x15:
            fo.write(struct.pack("<LLL", 32, 4, fmt4))
            fo.write(bytes([0]*24))
            fo.write(buf[128:])
        #A8R8G8B8
        else:
            fo.write(struct.pack("<LLLL", 32, 0x40, 0, 32))
            fo.write(bytes([0,255,0,0, 0,0,255,0, 0,0,0,255, 255,0,0,0]))
            fo.write(bytes([0,0,0,0]))
            fo.write(buf[128:])
        #todo a8