1 files changed, 33 insertions, 0 deletions
diff --git a/libkeccak_state_marshal.c b/libkeccak_state_marshal.c
new file mode 100644
index 0000000..2714a52
--- /dev/null
+++ b/libkeccak_state_marshal.c
@@ -0,0 +1,33 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+/**
+ * Marshal a `libkeccak_state_t` into a buffer
+ * 
+ * @param   state  The state to marshal
+ * @param   data   The output buffer
+ * @return         The number of bytes stored to `data`
+ */
+size_t
+libkeccak_state_marshal(const libkeccak_state_t *restrict state, void *restrict data_)
+{
+#define set(type, var) *((type *)data) = state->var, data += sizeof(type) / sizeof(char)
+	char *restrict data = data_;
+	set(long int, r);
+	set(long int, c);
+	set(long int, n);
+	set(long int, b);
+	set(long int, w);
+	set(int64_t, wmod);
+	set(long int, l);
+	set(long int, nr);
+	memcpy(data, state->S, sizeof(state->S));
+	data += sizeof(state->S) / sizeof(char);
+	set(size_t, mptr);
+	set(size_t, mlen);
+	memcpy(data, state->M, state->mptr * sizeof(char));
+	data += state->mptr;
+	return sizeof(libkeccak_state_t) - sizeof(char *) + state->mptr * sizeof(char);
+#undef set
+}