60 lines
2.2 KiB
Python
60 lines
2.2 KiB
Python
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#!/usr/bin/env python2
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#
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# Copyright (C) 2013 Google Inc.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# 3. The name of the author may not be used to endorse or promote products
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# derived from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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"""
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This utility computes and fills Exynos ROM checksum (for BL1 or BL2).
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(Algorithm from U-Boot: tools/mkexynosspl.c)
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Input: IN OUT DATA_SIZE
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Output:
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IN padded out to DATA_SIZE, checksum at the end, written to OUT.
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"""
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import struct
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import sys
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def main(argv):
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if len(argv) != 4:
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exit('usage: %s IN OUT DATA_SIZE' % argv[0])
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in_name, out_name = argv[1:3]
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size = int(argv[3], 0)
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checksum_format = "<I"
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with open(in_name, "rb") as in_file, open(out_name, "wb") as out_file:
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data = in_file.read()
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checksum_size = struct.calcsize(checksum_format)
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data_size = size - checksum_size
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assert len(data) <= data_size
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checksum = struct.pack(checksum_format, sum(map(ord, data)))
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out_file.write(data + bytearray(data_size - len(data)) + checksum)
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if __name__ == '__main__':
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main(sys.argv)
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