First commit

Signed-off-by: Mattias Andrée <maandree@kth.se>

1 files changed, 43 insertions, 0 deletions

diff --git a/marshal.c b/marshal.c
new file mode 100644
index 0000000..c2d1c11
--- /dev/null
+++ b/marshal.c
@@ -0,0 +1,43 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+/**
+ * Marshal a state into a buffer
+ * 
+ * @param   state  The state to marshal
+ * @param   buf    Output buffer, `NULL` to only return the required size
+ * @return         The number of bytes marshalled to `buf`
+ */
+size_t
+libsha1_marshal(const struct libsha1_state *restrict state, void *restrict buf_)
+{
+	char *restrict buf = buf_;
+	size_t off = 0;
+
+	if (buf)
+		*(int *)buf = 0; /* version */
+	off += sizeof(int);
+	if (buf)
+		*(enum libsha1_algorithm *)&buf[off] = state->algorithm;
+	off += sizeof(enum libsha1_algorithm);
+	if (buf)
+		*(size_t *)&buf[off] = state->message_size;
+	off += sizeof(size_t);
+
+	if (buf)
+		memcpy(&buf[off], state->w, sizeof(state->w));
+	off += sizeof(state->w);
+	if (buf)
+		memcpy(&buf[off], state->h, sizeof(state->h));
+	off += sizeof(state->h);
+
+	if (buf)
+		*(size_t *)&buf[off] = state->chunk_size;
+	off += sizeof(size_t);
+	if (buf)
+		memcpy(&buf[off], state->chunk, (state->message_size / 8) % state->chunk_size);
+	off += (state->message_size / 8) % state->chunk_size;
+
+	return off;
+}