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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "sd-bus.h"
#include "bus-signature.h"
#include "bus-type.h"
static int signature_element_length_internal(
const char *s,
bool allow_dict_entry,
unsigned array_depth,
unsigned struct_depth,
size_t *l) {
int r;
if (!s)
return -EINVAL;
assert(l);
if (bus_type_is_basic(*s) || *s == SD_BUS_TYPE_VARIANT) {
*l = 1;
return 0;
}
if (*s == SD_BUS_TYPE_ARRAY) {
size_t t;
if (array_depth >= 32)
return -EINVAL;
r = signature_element_length_internal(s + 1, true, array_depth+1, struct_depth, &t);
if (r < 0)
return r;
*l = t + 1;
return 0;
}
if (*s == SD_BUS_TYPE_STRUCT_BEGIN) {
const char *p = s + 1;
if (struct_depth >= 32)
return -EINVAL;
while (*p != SD_BUS_TYPE_STRUCT_END) {
size_t t;
r = signature_element_length_internal(p, false, array_depth, struct_depth+1, &t);
if (r < 0)
return r;
p += t;
}
if (p - s < 2)
/* D-Bus spec: Empty structures are not allowed; there
* must be at least one type code between the parentheses.
*/
return -EINVAL;
*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;
if (struct_depth >= 32)
return -EINVAL;
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, array_depth, struct_depth+1, &t);
if (r < 0)
return r;
p += t;
n++;
}
if (n != 2)
return -EINVAL;
*l = p - s + 1;
return 0;
}
return -EINVAL;
}
int signature_element_length(const char *s, size_t *l) {
return signature_element_length_internal(s, true, 0, 0, l);
}
bool signature_is_single(const char *s, bool allow_dict_entry) {
int r;
size_t t;
if (!s)
return false;
r = signature_element_length_internal(s, allow_dict_entry, 0, 0, &t);
if (r < 0)
return false;
return s[t] == 0;
}
bool signature_is_pair(const char *s) {
if (!s)
return false;
if (!bus_type_is_basic(*s))
return false;
return signature_is_single(s + 1, false);
}
bool signature_is_valid(const char *s, bool allow_dict_entry) {
const char *p;
int r;
if (!s)
return false;
p = s;
while (*p) {
size_t t;
r = signature_element_length_internal(p, allow_dict_entry, 0, 0, &t);
if (r < 0)
return false;
p += t;
}
return p - s <= SD_BUS_MAXIMUM_SIGNATURE_LENGTH;
}
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