diff --git a/libisofs/trunk/libisofs/ecma119.c b/libisofs/trunk/libisofs/ecma119.c
index 017680d2..0f484ce8 100755
--- a/libisofs/trunk/libisofs/ecma119.c
+++ b/libisofs/trunk/libisofs/ecma119.c
@@ -438,16 +438,16 @@ write_pri_vol_desc(struct ecma119_write_target *t, uint8_t *buf)
 {
 	struct ecma119_pri_vol_desc *vol = (struct ecma119_pri_vol_desc*)buf;
 	struct iso_volume *volume = t->volset->volume[t->volnum];
-	char *vol_id = str2ascii(volume->volume_id);
-	char *pub_id = str2ascii(volume->publisher_id);
-	char *data_id = str2ascii(volume->data_preparer_id);
-	char *volset_id = str2ascii(t->volset->volset_id);
+	char *vol_id = str2d_char(volume->volume_id);
+	char *pub_id = str2a_char(volume->publisher_id);
+	char *data_id = str2a_char(volume->data_preparer_id);
+	char *volset_id = str2d_char(t->volset->volset_id);
 	
-	char *system_id = str2ascii(volume->system_id);
-	char *application_id = str2ascii(volume->application_id);
-	char *copyright_file_id = str2ascii(volume->copyright_file_id);
-	char *abstract_file_id = str2ascii(volume->abstract_file_id);
-	char *biblio_file_id = str2ascii(volume->biblio_file_id);
+	char *system_id = str2a_char(volume->system_id);
+	char *application_id = str2a_char(volume->application_id);
+	char *copyright_file_id = str2d_char(volume->copyright_file_id);
+	char *abstract_file_id = str2d_char(volume->abstract_file_id);
+	char *biblio_file_id = str2d_char(volume->biblio_file_id);
 	
 	vol->vol_desc_type[0] = 1;
 	memcpy(vol->std_identifier, "CD001", 5);
diff --git a/libisofs/trunk/libisofs/util.c b/libisofs/trunk/libisofs/util.c
index bfa9610e..b7eb547a 100755
--- a/libisofs/trunk/libisofs/util.c
+++ b/libisofs/trunk/libisofs/util.c
@@ -78,7 +78,6 @@ static wchar_t *str2wchar(const char *str, const char *codeset)
 	}
 	iconv_close(conv);
 	
-	//TODO is needed this??
 	*( (wchar_t *)ret )='\0';
 	return wstr;
 } 
@@ -250,7 +249,6 @@ uint16_t *str2ucs(const char *src_arg)
 	return (uint16_t*)ret_;
 }
 
-
 static int valid_d_char(char c)
 {
 	return (c >= '0' && c <= '9') || (c >= 'A' && c <= 'Z') || (c == '_');
@@ -278,6 +276,42 @@ static int valid_p_char(char c)
 				      || (c == '.') || (c == '_') || (c == '-');
 }
 
+char *str2d_char(const char *str) {
+	char *ret;
+	size_t len, i;
+	
+	if (!str)
+		return NULL;
+	
+	ret = str2ascii(str);
+	len = strlen(ret);
+	
+	for (i = 0; i < len; ++i) {
+		char c = toupper(ret[i]);
+		ret[i] = valid_d_char(c) ? c : '_';
+	}
+	
+	return ret;
+}
+
+char *str2a_char(const char *str) {
+	char *ret;
+	size_t len, i;
+	
+	if (!str)
+		return NULL;
+	
+	ret = str2ascii(str);
+	len = strlen(ret);
+	
+	for (i = 0; i < len; ++i) {
+		char c = toupper(ret[i]);
+		ret[i] = valid_a_char(c) ? c : '_';
+	}
+	
+	return ret;
+}
+
 static char *iso_dirid(const char *src, int size)
 {
 	char *ret = str2ascii(src);
diff --git a/libisofs/trunk/libisofs/util.h b/libisofs/trunk/libisofs/util.h
index c8736aca..c8f50d10 100755
--- a/libisofs/trunk/libisofs/util.h
+++ b/libisofs/trunk/libisofs/util.h
@@ -34,6 +34,9 @@ wchar_t *towcs(const char *);
 char *str2ascii(const char*);
 uint16_t *str2ucs(const char*);
 
+char *str2d_char(const char*);
+char *str2a_char(const char*);
+
 /**
  * Create a level 1 directory identifier.
  */