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scripts/signrom.py: Allow option ROM checksum script to write the size header.

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Modify the signrom.py script so that if the size byte in the header is
0 (ie. not set) then the script will set the size.  If the size byte
is non-zero then we do the same as before, so this doesn't require
changes to any existing ROM sourcecode.

Signed-off-by: Richard W.M. Jones <rjones@redhat.com>
Message-Id: <1463000807-18015-2-git-send-email-rjones@redhat.com>
This commit is contained in:
Richard W.M. Jones 2016-05-11 22:06:45 +01:00 committed by Paolo Bonzini
parent 168340b6ba
commit 6f71b779c8
1 changed files with 22 additions and 3 deletions
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23
scripts/signrom.py
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@ -18,10 +18,29 @@ fin = open(sys.argv[1], 'rb')
fout = open(sys.argv[2], 'wb')
fin.seek(2)
size = ord(fin.read(1)) * 512 - 1
size_byte = ord(fin.read(1))
fin.seek(0)
if size_byte == 0:
# If the caller left the size field blank then we will fill it in,
# also rounding the whole input to a multiple of 512 bytes.
data = fin.read()
# +1 because we need a byte to store the checksum.
size = len(data) + 1
# Round up to next multiple of 512.
size += 511
size -= size % 512
if size >= 65536:
sys.exit("%s: option ROM size too large" % sys.argv[1])
# size-1 because a final byte is added below to store the checksum.
data = data.ljust(size-1, '\0')
data = data[:2] + chr(size/512) + data[3:]
else:
# Otherwise the input file specifies the size so use it.
# -1 because we overwrite the last byte of the file with the checksum.
size = size_byte * 512 - 1
data = fin.read(size)
fout.write(data)
checksum = 0