Portability saving fixes for big endian systems.

Saves should now be portable from big endian to little endian systems
though I need someone to actually test it to be sure I didn't mess up.

3 files changed, 16 insertions, 3 deletions

diff --git a/toxcore/Messenger.c b/toxcore/Messenger.c
index 4841cbd9..eaf87179 100644
--- a/toxcore/Messenger.c
+++ b/toxcore/Messenger.c
@@ -2648,10 +2648,9 @@ uint32_t messenger_size(const Messenger *m)
 
 static uint8_t *z_state_save_subheader(uint8_t *data, uint32_t len, uint16_t type)
 {
-    memcpy(data, &len, sizeof(uint32_t));
+    host_to_lendian32(data, len);
     data += sizeof(uint32_t);
-    uint32_t temp = (MESSENGER_STATE_COOKIE_TYPE << 16) | type;
-    memcpy(data, &temp, sizeof(uint32_t));
+    host_to_lendian32(data, (host_tolendian16(MESSENGER_STATE_COOKIE_TYPE) << 16) | host_tolendian16(type));
     data += sizeof(uint32_t);
     return data;
 }
diff --git a/toxcore/util.c b/toxcore/util.c
index 23e19290..3d444b07 100644
--- a/toxcore/util.c
+++ b/toxcore/util.c
@@ -93,6 +93,15 @@ uint16_t lendian_to_host16(uint16_t lendian)
 #endif
 }
 
+void host_to_lendian32(uint8_t *dest,  uint32_t num)
+{
+#ifdef WORDS_BIGENDIAN
+    num = ((num << 8) & 0xFF00FF00 ) | ((num >> 8) & 0xFF00FF );
+    num = (num << 16) | (num >> 16);
+#endif
+    memcpy(dest, &num, sizeof(uint32_t));
+}
+
 void lendian_to_host32(uint32_t *dest, const uint8_t *lendian)
 {
     uint32_t d;
diff --git a/toxcore/util.h b/toxcore/util.h
index 7992a985..e90eee0f 100644
--- a/toxcore/util.h
+++ b/toxcore/util.h
@@ -42,6 +42,11 @@ uint32_t id_copy(uint8_t *dest, const uint8_t *src); /* return value is CLIENT_I
 void host_to_net(uint8_t *num, uint16_t numbytes);
 #define net_to_host(x, y) host_to_net(x, y)
 
+uint16_t lendian_to_host16(uint16_t lendian);
+#define host_tolendian16(x) lendian_to_host16(x)
+
+void host_to_lendian32(uint8_t *dest,  uint32_t num);
+
 /* state load/save */
 typedef int (*load_state_callback_func)(void *outer, const uint8_t *data, uint32_t len, uint16_t type);
 int load_state(load_state_callback_func load_state_callback, void *outer,