fix memory realloc

skeletons/constr_SET_OF.c

@@ -279,10 +279,12 @@ static int _el_addbytes(const void *buffer, size_t size, void *el_buf_ptr) {
     struct _el_buffer *el_buf = (struct _el_buffer *)el_buf_ptr;
 
     if(el_buf->length + size > el_buf->allocated_size) {
-        size_t new_size;
+        size_t new_size = el_buf->allocated_size ? el_buf->allocated_size : 8;
         void *p;
 
-        new_size = el_buf->allocated_size ? 2 * el_buf->allocated_size : 16;
+        do {
+            new_size <<= 2;
+        } while(el_buf->length + size > new_size);
 
         p = REALLOC(el_buf->buf, new_size);
         if(p) {

skeletons/per_encoder.c

@@ -82,15 +82,21 @@ static int
 encode_dyn_cb(const void *buffer, size_t size, void *key) {
     enc_dyn_arg *arg = key;
     if(arg->length + size >= arg->allocated) {
+        size_t new_size = arg->allocated ? arg->allocated : 8;
         void *p;
-		arg->allocated = arg->allocated ? (arg->allocated << 2) : size;
-		p = REALLOC(arg->buffer, arg->allocated);
+
+        do {
+            new_size <<= 2;
+        } while(arg->length + size >= new_size);
+
+        p = REALLOC(arg->buffer, new_size);
         if(!p) {
             FREEMEM(arg->buffer);
             memset(arg, 0, sizeof(*arg));
             return -1;
         }
         arg->buffer = p;
+        arg->allocated = new_size;
     }
     memcpy(((char *)arg->buffer) + arg->length, buffer, size);
     arg->length += size;