hi_low_byte_split.py

#!/usr/local/bin/python3
# Extremely basic high/low byte splitter for ROMS -- Public Domain

import os

fin = open( "tos.img", "rb" )

infilesize = os.stat("tos.img").st_size

fhi = open( "2way_high.img", "wb" )
flo = open( "2way_low.img", "wb" )

byte = 1                # just want the next test to pass
while byte:             # stop at EOF
    byte = fin.read(1)  # read one byte
    fhi.write(byte)     # write it to the high file

    byte = fin.read(1)  # read one more byte
    flo.write(byte)     # write it the low file, then repeat

fin.close()
fhi.close()
flo.close()

fhi = open( "2way_high.img", "rb" )
flo = open( "2way_low.img", "rb" )

fhi0 = open( "6way_high_0.img", "wb" )
fhi1 = open( "6way_high_1.img", "wb" )
fhi2 = open( "6way_high_2.img", "wb" )



# let's then further split those into 6 for the pre-STE range

size_6way = infilesize / 6
if size_6way != int(size_6way):
    print( "Couldn't split into 6 files as input file is not a multiple of 6\n")
    exit(100)

size_6way = int(size_6way)

flo0 = open( "6way_low_0.img", "wb" )
flo1 = open( "6way_low_1.img", "wb" )
flo2 = open( "6way_low_2.img", "wb" )

data = fhi.read(size_6way)  # read size_6way bytes from high
fhi0.write(data)     # write it to the high 0 file

data = fhi.read(size_6way)  # read size_6way bytes from high
fhi1.write(data)     # write it to the high 1 file

data = fhi.read(size_6way)  # read size_6way bytes from high
fhi2.write(data)     # write it to the high 2 file


# same now for low

data = flo.read(size_6way)  # read size_6way bytes from low
flo0.write(data)     # write it to the low 0 file

data = flo.read(size_6way)  # read size_6way bytes from high
flo1.write(data)     # write it to the low 1 file

data = flo.read(size_6way)  # read size_6way bytes from high
flo2.write(data)     # write it to the low 2 file


fhi.close()
flo.close()

fhi0.close()
fhi1.close()
fhi2.close()
flo0.close()
flo1.close()
flo2.close()