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trezor-firmware/tools/combine_firmware

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#!/usr/bin/env python3
import sys
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def pairwise(iterable):
a = iter(iterable)
return zip(a, a)
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files = sys.argv[1:]
files = list(pairwise(files))
offset = int(files[0][0], 16)
out = bytearray()
for addr, fn in files:
addr = int(addr, 16) - offset
data = open(fn, 'rb').read()
if len(out) < addr:
out += b'\x00' * (addr - len(out))
if len(out) != addr:
raise Exception('Alignment failed')
out += data
sys.stdout.buffer.write(out)