1 files changed, 23 insertions, 0 deletions
diff --git a/src/red.c b/src/red.c
new file mode 100644
index 0000000..da9b5af
--- /dev/null
+++ b/src/red.c
@@ -0,0 +1,23 @@
+/*
+	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 <stdio.h>
+
+void agb_red (void * const restrict buf, FILE * restrict rom)
+{
+	fseek (rom, agb_romsrt, SEEK_SET); // We only need to read the part of the ROM that is used for the checksum.
+	size_t const num = agb_chksumoff+0x1u;
+	
+	if (fread (buf,0x1u, num, rom) != num) {
+		fputs ("Unable to read ROM\n", stderr);
+		agb_exi (agb_cnd_err, rom);
+	}
+}