NOCD patch for Constructor (1997)

constructor-nocd.py

#!/usr/bin/env python
# This script will let you play constructor without the CD
# in the drive. My retrogaming laptop has no CD drive.
f = open("GAME.EXE").read()
patches = [
        (272174,"\x74","\xeb"),
        (642050,"\x83\x3d\x88\x3b\x04\x00\x00","\x90\x90\x90\x90\x90\x90\x90"),
        (750753,"\x75","\xeb"),
        (750850,"\xfa\xff\xff\xff","\x00\x00\x00\x00"),
        (750887,"\x74","\xeb"),
]

for p in patches:
        if f[p[0]:p[0] + len(p[1])] != p[1]:
                print "Original data invalid. Already patched ?"
                if f[p[0]:p[0] + len(p[1])] == p[2]:
                        print "Yes."
                else:
                        print "No."
        else:
                f = f[:p[0]] + p[2] + f[p[0] + len(p[2]):]
patched = open("GAME_NOCD.EXE","w")
patched.write(f)