initial commit

1 files changed, 40 insertions, 0 deletions

diff --git a/src/farbfeld.c b/src/farbfeld.c
new file mode 100644
index 0000000..71903b1
--- /dev/null
+++ b/src/farbfeld.c
@@ -0,0 +1,40 @@
+/* Copyright (C) 2024 Aiden Gall
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>. */
+
+#include "util.h"
+
+#include <arpa/inet.h>
+#include <stdint.h>
+#include <stdio.h>
+
+/* write farbfeld image to fd
+ * - canvas will be mutated unless host architecture is big endian */
+void
+farbfeld_write(FILE *const fd, uint16_t *const canvas, const size_t canvas_size,
+               uint32_t width, uint32_t height)
+{
+	size_t i;
+
+	width = htonl(width);
+	height = htonl(height);
+
+	for (i = 0; i < canvas_size; i++)
+		canvas[i] = htons(canvas[i]);
+
+	efwrite("farbfeld", sizeof(char), 8, fd);
+	efwrite(&width, sizeof(uint32_t), 1, fd);
+	efwrite(&height, sizeof(uint32_t), 1, fd);
+	efwrite(canvas, sizeof(uint16_t), canvas_size, fd);
+}