Avoid unaligned accesses

Architectures like SPARC do not allow unaligned accesses. Avoid them by
memcpy()ing the data to an aligned buffer. On x86 systems where
unaligned loads are fast, the memcpy() will be compiled away and the
same code generated as before.

src/endian.c

@@ -13,6 +13,7 @@ void xle64enc(uint8_t *d, uint64_t n) {
 #elif defined(__linux__) || defined(__FreeBSD__)
 
 #include <stdint.h>
+#include <string.h>
 #ifdef __linux__
 	#include <endian.h>
 	#include <byteswap.h>
@@ -37,11 +38,14 @@ void xle64enc(uint8_t *d, uint64_t n) {
 #endif
 
 uint64_t xle64dec(const uint8_t *d) {
-    return le64toh(*(uint64_t*)d);
+    uint64_t tmp;
+    memcpy(&tmp, d, sizeof(tmp));
+    return le64toh(tmp);
 }
 
 void xle64enc(uint8_t *d, uint64_t n) {
-    *(uint64_t*)d = htole64(n);
+    uint64_t tmp = htole64(n);
+    memcpy(d, &tmp, sizeof(tmp));
 }
 
 #else