def extract():
    print 'Extracting %s...' % sys.argv[2]
    filedata = get_data(sys.argv[2])
    newfiledata = ''
    decomplen = struct.unpack('<I',filedata[:4])[0]
    filedata = filedata[0x4:]
    ringbuff = []
    for i in range(0,0x1000):
        ringbuff.append('\x00')
    ringpos = 0xfee

    i = 0
    control = 0
    while len(newfiledata) < decomplen:
        control >>= 1
        oldcontrol = control
        if (control & 0x100) == 0:
            control = ord(filedata[i]) | 0xFF00
            i += 1
            oldcontrol = control
        ecx = ord(filedata[i])
        if (control & 1) != 0:
            ringbuff[ringpos] = chr(ecx)
            ringpos += 1
            ringpos &= 0xFFF
            newfiledata += chr(ecx)
            i += 1

        else:
            #003E672D - read from ring buff
            edx = ord(filedata[i+1])
            ebx = (edx & 0xF0) << 4
            ecx |= ebx
            edx &= 0xF
            ebx = ecx + edx + 2
            i += 2
            edx = ecx
            while edx <= ebx:
                ecx = edx
                ecx &= 0xFFF
                ecx = ord(ringbuff[ecx])
                ringbuff[ringpos] = chr(ecx)
                ringpos += 1
                ringpos &= 0xFFF
                newfiledata += chr(ecx)
                if len(newfiledata) >= decomplen:
                    break;
                edx += 1
            control = oldcontrol