for PSPGO firmwares, only based on 5.70

PSPGO_extract.py

from zlib import decompress
from struct import unpack
from os.path import exists
from os import makedirs
import sys

with open(sys.argv[1], "rb") as f:
    inputname = ".".join(sys.argv[1].split(".")[:-1])
    assert f.read(4) == b"PSAR"
    assert unpack("<I", f.read(4))[0] == 2 #version?
    f.seek(0, 2)
    fullsize = f.tell()
    f.seek(8)
    assert unpack("<I", f.read(4))[0] == (fullsize - 32) #size of file
    assert unpack("<I", f.read(4))[0] == 1 #idk
    assert f.read(16) == "\x00" * 16
    print(f.read(16).rstrip("\x00")) #version string? 5.70
    f.read(0x100) #???
    while f.tell() < fullsize: #run til end cuz I can't find a size var
        header = unpack("<I256s3I", f.read(0x110))
        print("%08X %08X %08X %08X %s" % (header[0], header[2], header[3], header[4], header[1].rstrip("\x00")))
        data = decompress(f.read(header[2]))
        filename = inputname + "/" + header[1].rstrip("\x00").replace(":", "") #"flash0/XXX", "ipl/XXX"
        path = "/".join(filename.split("/")[:-1])
        if not exists(path):
            makedirs(path)
        with open(filename, "wb") as o:
            o.write(data)