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/*
Copyright 2022-2023 Gabriel Jensen.
This file is part of agbsum.
agbsum is free software: you can redistribute it
and/or modify it under the terms of the GNU
Affero General Public License as published by
the Free Software Foundation, either version 3
of the License, or (at your option) any later
version.
agbsum is distributed in the hope that it will
be useful, but WITHOUT ANY WARRANTY; without
even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more
details.
You should have received a copy of the GNU
Affero General Public License along with agbsum.
If not, see <https://www.gnu.org/licenses/>.
*/
#include <agbsum.h>
#include <stdint.h>
uint8_t
agb_getsum (void const* const restrict imgptr)
{
uint8_t const* restrict img = imgptr;
uint8_t sum = UINT8_C(0x0);
for (char unsigned const* restrict pos = img; pos != img + agb_sumoff; ++pos) { sum += *pos; }
sum = -(UINT8_C(0x19) + sum);
return sum;
}
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