#-------------------------------------------------------------------------------
# hex_free_space
# 02/05/2022
# tool script used to estimate the free space left in a µP based on the number
# of 0xFF bytes in the hex file. This methode only works for filled hex files.
#
# usage ex: python hex_free_size somehexfile.hex somemorehexfile.hex
#-------------------------------------------------------------------------------

import fileinput
import re

free_space = 0
free_threshold = 16

p = re.compile(r':[0-9A-F]{8,8}([0-9A-F]{32,32})')
for line in fileinput.input():
    val = re.search(p, line)
    if val:
        data = val.group(0)
        count = 0
        for char in data:
            if char == 'F':
                count += 1
        if count <= free_threshold:
            continue

        for char in data:
            if char == 'F':
                if first:
                    first = False
                else:
                    first = True
                    free_space += 1
            else:
                first = True

print("estimated free space: " + str(free_space))