diff -r bf3695fee719 -r 481802342fdf libidav/utils.h
--- a/libidav/utils.h	Mon Feb 04 14:11:57 2019 +0100
+++ b/libidav/utils.h	Mon Feb 04 17:17:48 2019 +0100
@@ -69,8 +69,8 @@
 char* util_url_decode(DavSession *sn, char *url);
 char* util_resource_name(char *url);
 char* util_concat_path(const char *url_base, const char *path);
-char* util_get_url(DavSession *sn, char *href);
-void util_set_url(DavSession *sn, char *href);
+char* util_get_url(DavSession *sn, const char *href);
+void util_set_url(DavSession *sn, const char *href);
 
 void util_capture_header(CURL *handle, UcxMap* map);
 
@@ -82,9 +82,9 @@
 
 char* util_xml_get_text(const xmlNode *elm);
 
-char* util_base64decode(char *in);
-char* util_base64decode_len(char *in, int *outlen);
-char* util_base64encode(char *in, size_t len);
+char* util_base64decode(const char *in);
+char* util_base64decode_len(const char *in, int *outlen);
+char* util_base64encode(const char *in, size_t len);
 
 char* util_encrypt_str(DavSession *sn, char *str, char *key);
 char* util_encrypt_str_k(DavSession *sn, char *str, DavKey *key);