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-rw-r--r--src/libsystemd-bus/bus-signature.c141
1 files changed, 141 insertions, 0 deletions
diff --git a/src/libsystemd-bus/bus-signature.c b/src/libsystemd-bus/bus-signature.c
new file mode 100644
index 0000000000..db95c8870d
--- /dev/null
+++ b/src/libsystemd-bus/bus-signature.c
@@ -0,0 +1,141 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2013 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <util.h>
+
+#include "bus-signature.h"
+#include "bus-type.h"
+
+static int signature_element_length_internal(
+ const char *s,
+ bool allow_dict_entry,
+ size_t *l) {
+
+ int r;
+
+ assert(s);
+
+ if (bus_type_is_basic(*s) || *s == SD_BUS_TYPE_VARIANT) {
+ *l = 1;
+ return 0;
+ }
+
+ if (*s == SD_BUS_TYPE_ARRAY) {
+ size_t t;
+
+ r = signature_element_length_internal(s + 1, true, &t);
+ if (r < 0)
+ return r;
+
+ *l = t + 1;
+ return 0;
+ }
+
+ if (*s == SD_BUS_TYPE_STRUCT_BEGIN) {
+ const char *p = s + 1;
+
+ while (*p != SD_BUS_TYPE_STRUCT_END) {
+ size_t t;
+
+ r = signature_element_length_internal(p, false, &t);
+ if (r < 0)
+ return r;
+
+ p += t;
+ }
+
+ *l = p - s + 1;
+ return 0;
+ }
+
+ if (*s == SD_BUS_TYPE_DICT_ENTRY_BEGIN && allow_dict_entry) {
+ const char *p = s + 1;
+ unsigned n = 0;
+
+ while (*p != SD_BUS_TYPE_DICT_ENTRY_END) {
+ size_t t;
+
+ if (n == 0 && !bus_type_is_basic(*p))
+ return -EINVAL;
+
+ r = signature_element_length_internal(p, false, &t);
+ if (r < 0)
+ return r;
+
+ p += t;
+ n++;
+ }
+
+ if (n != 2)
+ return -EINVAL;
+
+ *l = p - s + 1;
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+bool signature_is_single(const char *s) {
+ int r;
+ size_t t;
+
+ assert(s);
+
+ r = signature_element_length(s, &t);
+ if (r < 0)
+ return false;
+
+ return s[t] == 0;
+}
+
+bool signature_is_pair(const char *s) {
+ assert(s);
+
+ if (!bus_type_is_basic(*s))
+ return false;
+
+ return signature_is_single(s + 1);
+}
+
+bool signature_is_valid(const char *s, bool allow_dict_entry) {
+ const char *p;
+ int r;
+
+ assert(s);
+
+ p = s;
+ while (*p) {
+ size_t t;
+
+ r = signature_element_length_internal(p, allow_dict_entry, &t);
+ if (r < 0)
+ return false;
+
+ p += t;
+ }
+
+ return p - s <= 255;
+}
+
+int signature_element_length(const char *s, size_t *l) {
+ return signature_element_length_internal(s, true, l);
+}