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author | Richard W.M. Jones | 2016-05-11 23:06:45 +0200 |
---|---|---|
committer | Paolo Bonzini | 2016-05-23 16:53:45 +0200 |
commit | 6f71b779c8b05cf60ea0fffbcd8c02adfe845ece (patch) | |
tree | 505afa5df616f0f0891ff3fd22e8d02cb02ddbb8 /scripts | |
parent | Remove config-devices.mak on 'make clean' (diff) | |
download | qemu-6f71b779c8b05cf60ea0fffbcd8c02adfe845ece.tar.gz qemu-6f71b779c8b05cf60ea0fffbcd8c02adfe845ece.tar.xz qemu-6f71b779c8b05cf60ea0fffbcd8c02adfe845ece.zip |
scripts/signrom.py: Allow option ROM checksum script to write the size header.
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>
Diffstat (limited to 'scripts')
-rw-r--r-- | scripts/signrom.py | 25 |
1 files changed, 22 insertions, 3 deletions
diff --git a/scripts/signrom.py b/scripts/signrom.py index f9c35ccfca..6c8b9bf406 100644 --- a/scripts/signrom.py +++ b/scripts/signrom.py @@ -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) -data = fin.read(size) + +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 |