1 files changed, 22 insertions, 0 deletions
diff --git a/libquanta_palette_size.c b/libquanta_palette_size.c
new file mode 100644
index 0000000..e8b95eb
--- /dev/null
+++ b/libquanta_palette_size.c
@@ -0,0 +1,22 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+int
+libquanta_palette_size(size_t ncolours, size_t nchannels, size_t *size_out)
+{
+	if (!ncolours || !nchannels) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	if (ncolours > (SIZE_MAX - PALETTE_BASE_SIZE) / PALETTE_VALUE_SIZE / nchannels) {
+		errno = EOVERFLOW;
+		return -1;
+	}
+
+	if (size_out)
+		*size_out = PALETTE_BASE_SIZE + ncolours * nchannels * PALETTE_VALUE_SIZE;
+
+	return 0;
+}