dos_ovr.py

FB_MAGIC = 0x4246
OV_MAGIC = 0x564F
SI_COD = 0x0001
SI_OVR = 0x0002
SI_DAT = 0x0004
STUBUNK_SIZE = (0x20-0x10)

ovr_noexe = 0
ovr_pascal = 1
ovr_cpp = 2
ovr_ms = 3

def fbov_t(
        fb=0, # unsigned short int
        ov=0, # unsigned short int
        ovrsize=0, # unsigned int
        exeinfo=0, # unsigned int
        segnum=0, # int
    ):
    ret = ""
    ret += pack("H", fb)
    ret += pack("H", ov)
    ret += pack("I", ovrsize)
    ret += pack("I", exeinfo)
    ret += pack("i", segnum)
    return ret

def stub_t(
        CDh=0, # unsigned char
        intnum=0, # unsigned char
        memswap=0, # unsigned short int
        fileoff=0, # int
        codesize=0, # unsigned short int
        relsize=0, # unsigned short int
        nentries=0, # unsigned short int
        prevstub=0, # unsigned short int
        unknown=0, # unsigned char
    ):
    ret = ""
    ret += pack("B", CDh)
    ret += pack("B", intnum)
    ret += pack("H", memswap)
    ret += pack("i", fileoff)
    ret += pack("H", codesize)
    ret += pack("H", relsize)
    ret += pack("H", nentries)
    ret += pack("H", prevstub)
    ret += pack("B", unknown)
    return ret

def ms_entry(
        CDh=0, # unsigned char
        intnum=0, # unsigned char
        ovr_index=0, # unsigned short int
        entry_off=0, # unsigned short int
    ):
    ret = ""
    ret += pack("B", CDh)
    ret += pack("B", intnum)
    ret += pack("H", ovr_index)
    ret += pack("H", entry_off)
    return ret

def ovrentry_t(
        int3f=0, # unsigned short int
        off=0, # unsigned short int
        segc=0, # char
    ):
    ret = ""
    ret += pack("H", int3f)
    ret += pack("H", off)
    ret += pack("b", segc)
    return ret

def seginfo_t(
        seg=0, # unsigned short int
        maxoff=0, # unsigned short int
        flags=0, # unsigned short int
        minoff=0, # unsigned short int
    ):
    ret = ""
    ret += pack("H", seg)
    ret += pack("H", maxoff)
    ret += pack("H", flags)
    ret += pack("H", minoff)
    return ret