util/nvmutil: don't copy data in copy/swap

instead, use a single integer, set to 1 if using
these commands (otherwise set to 0) used as an XOR
mask.

use this to invert where data gets read. one quirk
with this is that if a copy operation is performed
from a part with a bad checksum, it's already done
in advance, in memory, but then the check on the
checksum in cmd_copy is now checking the other part,
which will be all zeroes, so i invert that too; this
means now when running cmd_copy, it'll complain about
an invalid part, but the part number is inverted.

it's a small price to pay, because this restores the
previous performance optimisations but without being
as unsafe.

this is also true when doing the swap.

Signed-off-by: Leah Rowe <leah@libreboot.org>

0 files changed, 0 insertions, 0 deletions