60 lines
2.2 KiB
Python
Executable File
60 lines
2.2 KiB
Python
Executable File
#!/usr/bin/env python
|
|
#
|
|
# Copyright (C) 2013 Google Inc.
|
|
#
|
|
# Redistribution and use in source and binary forms, with or without
|
|
# modification, are permitted provided that the following conditions
|
|
# are met:
|
|
# 1. Redistributions of source code must retain the above copyright
|
|
# notice, this list of conditions and the following disclaimer.
|
|
# 2. Redistributions in binary form must reproduce the above copyright
|
|
# notice, this list of conditions and the following disclaimer in the
|
|
# documentation and/or other materials provided with the distribution.
|
|
# 3. The name of the author may not be used to endorse or promote products
|
|
# derived from this software without specific prior written permission.
|
|
#
|
|
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
# SUCH DAMAGE.
|
|
|
|
"""
|
|
This utility computes and fills Exynos ROM checksum (for BL1 or BL2).
|
|
(Algorithm from U-Boot: tools/mkexynosspl.c)
|
|
|
|
Input: IN OUT DATA_SIZE
|
|
|
|
Output:
|
|
|
|
IN padded out to DATA_SIZE, checksum at the end, written to OUT.
|
|
"""
|
|
|
|
import struct
|
|
import sys
|
|
|
|
def main(argv):
|
|
if len(argv) != 4:
|
|
exit('usage: %s IN OUT DATA_SIZE' % argv[0])
|
|
|
|
in_name, out_name = argv[1:3]
|
|
size = int(argv[3], 0)
|
|
checksum_format = "<I"
|
|
with open(in_name, "rb") as in_file, open(out_name, "wb") as out_file:
|
|
data = in_file.read()
|
|
checksum_size = struct.calcsize(checksum_format)
|
|
data_size = size - checksum_size
|
|
assert len(data) <= data_size
|
|
checksum = struct.pack(checksum_format, sum(map(ord, data)))
|
|
out_file.write(data + bytearray(data_size - len(data)) + checksum)
|
|
|
|
|
|
if __name__ == '__main__':
|
|
main(sys.argv)
|