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-rw-r--r--src/libsystemd/bus-gvariant.c249
1 files changed, 249 insertions, 0 deletions
diff --git a/src/libsystemd/bus-gvariant.c b/src/libsystemd/bus-gvariant.c
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index 0000000000..dc40009925
--- /dev/null
+++ b/src/libsystemd/bus-gvariant.c
@@ -0,0 +1,249 @@
+/*-*- 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-type.h"
+#include "bus-gvariant.h"
+#include "bus-signature.h"
+
+int bus_gvariant_get_size(const char *signature) {
+ const char *p;
+ int sum = 0, r;
+
+ /* For fixed size structs. Fails for variable size structs. */
+
+ p = signature;
+ while (*p != 0) {
+ size_t n;
+
+ r = signature_element_length(p, &n);
+ if (r < 0)
+ return r;
+ else {
+ char t[n+1];
+
+ memcpy(t, p, n);
+ t[n] = 0;
+
+ r = bus_gvariant_get_alignment(t);
+ if (r < 0)
+ return r;
+
+ sum = ALIGN_TO(sum, r);
+ }
+
+ switch (*p) {
+
+ case SD_BUS_TYPE_BOOLEAN:
+ case SD_BUS_TYPE_BYTE:
+ sum += 1;
+ break;
+
+ case SD_BUS_TYPE_INT16:
+ case SD_BUS_TYPE_UINT16:
+ sum += 2;
+ break;
+
+ case SD_BUS_TYPE_INT32:
+ case SD_BUS_TYPE_UINT32:
+ case SD_BUS_TYPE_UNIX_FD:
+ sum += 4;
+ break;
+
+ case SD_BUS_TYPE_INT64:
+ case SD_BUS_TYPE_UINT64:
+ case SD_BUS_TYPE_DOUBLE:
+ sum += 8;
+ break;
+
+ case SD_BUS_TYPE_STRUCT_BEGIN:
+ case SD_BUS_TYPE_DICT_ENTRY_BEGIN: {
+ char t[n-1];
+
+ memcpy(t, p + 1, n - 2);
+ t[n - 2] = 0;
+
+ r = bus_gvariant_get_size(t);
+ if (r < 0)
+ return r;
+
+ sum += r;
+ break;
+ }
+
+ case SD_BUS_TYPE_STRING:
+ case SD_BUS_TYPE_OBJECT_PATH:
+ case SD_BUS_TYPE_SIGNATURE:
+ case SD_BUS_TYPE_ARRAY:
+ case SD_BUS_TYPE_VARIANT:
+ return -EINVAL;
+
+ default:
+ assert_not_reached("Unknown signature type");
+ }
+
+ p += n;
+ }
+
+ r = bus_gvariant_get_alignment(signature);
+ if (r < 0)
+ return r;
+
+ return ALIGN_TO(sum, r);
+}
+
+int bus_gvariant_get_alignment(const char *signature) {
+ size_t alignment = 1;
+ const char *p;
+ int r;
+
+ p = signature;
+ while (*p != 0 && alignment < 8) {
+ size_t n;
+ int a;
+
+ r = signature_element_length(p, &n);
+ if (r < 0)
+ return r;
+
+ switch (*p) {
+
+ case SD_BUS_TYPE_BYTE:
+ case SD_BUS_TYPE_BOOLEAN:
+ case SD_BUS_TYPE_STRING:
+ case SD_BUS_TYPE_OBJECT_PATH:
+ case SD_BUS_TYPE_SIGNATURE:
+ a = 1;
+ break;
+
+ case SD_BUS_TYPE_INT16:
+ case SD_BUS_TYPE_UINT16:
+ a = 2;
+ break;
+
+ case SD_BUS_TYPE_INT32:
+ case SD_BUS_TYPE_UINT32:
+ case SD_BUS_TYPE_UNIX_FD:
+ a = 4;
+ break;
+
+ case SD_BUS_TYPE_INT64:
+ case SD_BUS_TYPE_UINT64:
+ case SD_BUS_TYPE_DOUBLE:
+ case SD_BUS_TYPE_VARIANT:
+ a = 8;
+ break;
+
+ case SD_BUS_TYPE_ARRAY: {
+ char t[n];
+
+ memcpy(t, p + 1, n - 1);
+ t[n - 1] = 0;
+
+ a = bus_gvariant_get_alignment(t);
+ break;
+ }
+
+ case SD_BUS_TYPE_STRUCT_BEGIN:
+ case SD_BUS_TYPE_DICT_ENTRY_BEGIN: {
+ char t[n-1];
+
+ memcpy(t, p + 1, n - 2);
+ t[n - 2] = 0;
+
+ a = bus_gvariant_get_alignment(t);
+ break;
+ }
+
+ default:
+ assert_not_reached("Unknown signature type");
+ }
+
+ if (a < 0)
+ return a;
+
+ assert(a > 0 && a <= 8);
+ if ((size_t) a > alignment)
+ alignment = (size_t) a;
+
+ p += n;
+ }
+
+ return alignment;
+}
+
+int bus_gvariant_is_fixed_size(const char *signature) {
+ const char *p;
+ int r;
+
+ assert(signature);
+
+ p = signature;
+ while (*p != 0) {
+ size_t n;
+
+ r = signature_element_length(p, &n);
+ if (r < 0)
+ return r;
+
+ switch (*p) {
+
+ case SD_BUS_TYPE_STRING:
+ case SD_BUS_TYPE_OBJECT_PATH:
+ case SD_BUS_TYPE_SIGNATURE:
+ case SD_BUS_TYPE_ARRAY:
+ case SD_BUS_TYPE_VARIANT:
+ return 0;
+
+ case SD_BUS_TYPE_BYTE:
+ case SD_BUS_TYPE_BOOLEAN:
+ case SD_BUS_TYPE_INT16:
+ case SD_BUS_TYPE_UINT16:
+ case SD_BUS_TYPE_INT32:
+ case SD_BUS_TYPE_UINT32:
+ case SD_BUS_TYPE_UNIX_FD:
+ case SD_BUS_TYPE_INT64:
+ case SD_BUS_TYPE_UINT64:
+ case SD_BUS_TYPE_DOUBLE:
+ break;
+
+ case SD_BUS_TYPE_STRUCT_BEGIN:
+ case SD_BUS_TYPE_DICT_ENTRY_BEGIN: {
+ char t[n-1];
+
+ memcpy(t, p + 1, n - 2);
+ t[n - 2] = 0;
+
+ r = bus_gvariant_is_fixed_size(t);
+ if (r <= 0)
+ return r;
+ break;
+ }
+
+ default:
+ assert_not_reached("Unknown signature type");
+ }
+
+ p += n;
+ }
+
+ return true;
+}