Fix some issues that fsanitize=undefined found

prrt/proto/types/packet.c

@@ -160,8 +160,10 @@ bool PrrtPacket_encode(void *buf_ptr, uint16_t buf_size, PrrtPacket *packet_ptr)
 
 #define PrrtPacketField_encode(payload, buf_ptr, field_t, field, conversion) \
     do { \
-        field_t *ptr = (field_t *) (buf_ptr); \
-        *ptr = conversion((payload)->field); \
+        field_t PrrtPacketField_encode_value = conversion((payload)->field); \
+        /* memcpy to avoid misaligned access.
+         * The compiler will optimize this into appropriate mov instructions */ \
+        memcpy(buf_ptr, &PrrtPacketField_encode_value, sizeof(field_t)); \
         (buf_ptr) += sizeof(field_t); \
     } while (false)
 
@@ -254,8 +256,11 @@ bool PrrtPacket_decode(void *srcBuffer, uint16_t srcBufferSize, PrrtPacket *targ
 
 #define PrrtPacketField_decode(payload, buf_ptr, field_t, field, conversion) \
     do { \
-        field_t *PrrtPacketField_decode_ptr = (field_t *) (buf_ptr); \
-        (payload)->field = conversion(*PrrtPacketField_decode_ptr); \
+        field_t PrrtPacketField_decode_value; \
+        /* memcpy to avoid misaligned access.
+         * The compiler will optimize this into appropriate mov instructions */ \
+        memcpy(&PrrtPacketField_decode_value, buf_ptr, sizeof(field_t)); \
+        (payload)->field = conversion(PrrtPacketField_decode_value); \
         (buf_ptr) += sizeof(field_t); \
     } while (false)
 

prrt/util/bitmap.h

@@ -26,14 +26,14 @@ BITMAP_EXPOSED_FUNCTION bool Bitmap_get(Bitmap *bitmap, uint32_t position)
 {
     uint32_t byte_offset = position / 32;
     uint32_t bit_offset = position % 32;
-    return (bool) ((bitmap->data[byte_offset] & (1 << bit_offset)) != 0);
+    return (bool) ((bitmap->data[byte_offset] & (1u << bit_offset)) != 0);
 }
 
 BITMAP_EXPOSED_FUNCTION bool Bitmap_set_0(Bitmap *bitmap, uint32_t position)
 {
     uint32_t byte_offset = position / 32;
     uint32_t bit_offset = position % 32;
-    bitmap->data[byte_offset] &= ~(1 << bit_offset);
+    bitmap->data[byte_offset] &= ~(1u << bit_offset);
 	return true;
 }
 
@@ -41,7 +41,7 @@ BITMAP_EXPOSED_FUNCTION bool Bitmap_set_1(Bitmap *bitmap, uint32_t position)
 {
     uint32_t byte_offset = position / 32;
     uint32_t bit_offset = position % 32;
-    bitmap->data[byte_offset] |= (1 << bit_offset);
+    bitmap->data[byte_offset] |= (1u << bit_offset);
 	return true;
 }