Pre-calc length destination directory before while loop

Author: GermanAizek

mz_zip_rw.c

@@ -815,6 +815,7 @@ int32_t mz_zip_reader_save_all(void *handle, const char *destination_dir) {
     int32_t err = MZ_OK;
     int32_t utf8_name_size = 0;
     int32_t resolved_name_size = 0;
+    int32_t destination_dir_len = 0;
     char *utf8_string = NULL;
     char *path = NULL;
     char *utf8_name = NULL;
@@ -826,14 +827,15 @@ int32_t mz_zip_reader_save_all(void *handle, const char *destination_dir) {
     if (err == MZ_END_OF_LIST)
         return err;
 
+    destination_dir_len = (int32_t)strlen(destination_dir) + 1;
     while (err == MZ_OK) {
         /* Assume 4 bytes per character needed + 1 for terminating null */
         utf8_name_size = reader->file_info->filename_size * 4 + 1;
         resolved_name_size = utf8_name_size;
 
         if (destination_dir) {
             /* +1 is for the "/" separator */
-            resolved_name_size += (int)strlen(destination_dir) + 1;
+            resolved_name_size += destination_dir_len;
         }
 
         new_alloc = (char *)realloc(path, resolved_name_size);