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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
c1b9d935 LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2013 Lennart Poettering | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public License | |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
20 | ||
c1b9d935 LP |
21 | #include "bus-gvariant.h" |
22 | #include "bus-signature.h" | |
cf0fbc49 | 23 | #include "bus-type.h" |
c1b9d935 | 24 | |
6647dc66 LP |
25 | int bus_gvariant_get_size(const char *signature) { |
26 | const char *p; | |
27 | int sum = 0, r; | |
c1b9d935 | 28 | |
6647dc66 | 29 | /* For fixed size structs. Fails for variable size structs. */ |
c1b9d935 | 30 | |
6647dc66 LP |
31 | p = signature; |
32 | while (*p != 0) { | |
33 | size_t n; | |
c1b9d935 | 34 | |
6647dc66 LP |
35 | r = signature_element_length(p, &n); |
36 | if (r < 0) | |
37 | return r; | |
38 | else { | |
39 | char t[n+1]; | |
40 | ||
41 | memcpy(t, p, n); | |
42 | t[n] = 0; | |
c1b9d935 | 43 | |
6647dc66 LP |
44 | r = bus_gvariant_get_alignment(t); |
45 | if (r < 0) | |
46 | return r; | |
c1b9d935 | 47 | |
6647dc66 LP |
48 | sum = ALIGN_TO(sum, r); |
49 | } | |
50 | ||
51 | switch (*p) { | |
52 | ||
53 | case SD_BUS_TYPE_BOOLEAN: | |
54 | case SD_BUS_TYPE_BYTE: | |
55 | sum += 1; | |
56 | break; | |
57 | ||
58 | case SD_BUS_TYPE_INT16: | |
59 | case SD_BUS_TYPE_UINT16: | |
60 | sum += 2; | |
61 | break; | |
62 | ||
63 | case SD_BUS_TYPE_INT32: | |
64 | case SD_BUS_TYPE_UINT32: | |
65 | case SD_BUS_TYPE_UNIX_FD: | |
66 | sum += 4; | |
67 | break; | |
68 | ||
69 | case SD_BUS_TYPE_INT64: | |
70 | case SD_BUS_TYPE_UINT64: | |
71 | case SD_BUS_TYPE_DOUBLE: | |
72 | sum += 8; | |
73 | break; | |
74 | ||
75 | case SD_BUS_TYPE_STRUCT_BEGIN: | |
76 | case SD_BUS_TYPE_DICT_ENTRY_BEGIN: { | |
e53d21d0 DH |
77 | if (n == 2) { |
78 | /* unary type () has fixed size of 1 */ | |
79 | r = 1; | |
80 | } else { | |
81 | char t[n-1]; | |
82 | ||
83 | memcpy(t, p + 1, n - 2); | |
84 | t[n - 2] = 0; | |
85 | ||
86 | r = bus_gvariant_get_size(t); | |
87 | if (r < 0) | |
88 | return r; | |
89 | } | |
6647dc66 LP |
90 | |
91 | sum += r; | |
92 | break; | |
93 | } | |
94 | ||
95 | case SD_BUS_TYPE_STRING: | |
96 | case SD_BUS_TYPE_OBJECT_PATH: | |
97 | case SD_BUS_TYPE_SIGNATURE: | |
98 | case SD_BUS_TYPE_ARRAY: | |
99 | case SD_BUS_TYPE_VARIANT: | |
100 | return -EINVAL; | |
101 | ||
102 | default: | |
103 | assert_not_reached("Unknown signature type"); | |
104 | } | |
105 | ||
106 | p += n; | |
c1b9d935 LP |
107 | } |
108 | ||
6647dc66 LP |
109 | r = bus_gvariant_get_alignment(signature); |
110 | if (r < 0) | |
111 | return r; | |
112 | ||
113 | return ALIGN_TO(sum, r); | |
c1b9d935 LP |
114 | } |
115 | ||
116 | int bus_gvariant_get_alignment(const char *signature) { | |
117 | size_t alignment = 1; | |
118 | const char *p; | |
119 | int r; | |
120 | ||
121 | p = signature; | |
122 | while (*p != 0 && alignment < 8) { | |
123 | size_t n; | |
124 | int a; | |
125 | ||
126 | r = signature_element_length(p, &n); | |
127 | if (r < 0) | |
128 | return r; | |
129 | ||
130 | switch (*p) { | |
131 | ||
132 | case SD_BUS_TYPE_BYTE: | |
133 | case SD_BUS_TYPE_BOOLEAN: | |
134 | case SD_BUS_TYPE_STRING: | |
135 | case SD_BUS_TYPE_OBJECT_PATH: | |
136 | case SD_BUS_TYPE_SIGNATURE: | |
137 | a = 1; | |
138 | break; | |
139 | ||
140 | case SD_BUS_TYPE_INT16: | |
141 | case SD_BUS_TYPE_UINT16: | |
142 | a = 2; | |
143 | break; | |
144 | ||
145 | case SD_BUS_TYPE_INT32: | |
146 | case SD_BUS_TYPE_UINT32: | |
147 | case SD_BUS_TYPE_UNIX_FD: | |
148 | a = 4; | |
149 | break; | |
150 | ||
151 | case SD_BUS_TYPE_INT64: | |
152 | case SD_BUS_TYPE_UINT64: | |
153 | case SD_BUS_TYPE_DOUBLE: | |
154 | case SD_BUS_TYPE_VARIANT: | |
155 | a = 8; | |
156 | break; | |
157 | ||
158 | case SD_BUS_TYPE_ARRAY: { | |
159 | char t[n]; | |
160 | ||
161 | memcpy(t, p + 1, n - 1); | |
162 | t[n - 1] = 0; | |
163 | ||
164 | a = bus_gvariant_get_alignment(t); | |
165 | break; | |
166 | } | |
167 | ||
168 | case SD_BUS_TYPE_STRUCT_BEGIN: | |
169 | case SD_BUS_TYPE_DICT_ENTRY_BEGIN: { | |
170 | char t[n-1]; | |
171 | ||
172 | memcpy(t, p + 1, n - 2); | |
173 | t[n - 2] = 0; | |
174 | ||
175 | a = bus_gvariant_get_alignment(t); | |
176 | break; | |
177 | } | |
178 | ||
179 | default: | |
180 | assert_not_reached("Unknown signature type"); | |
181 | } | |
182 | ||
183 | if (a < 0) | |
184 | return a; | |
185 | ||
186 | assert(a > 0 && a <= 8); | |
187 | if ((size_t) a > alignment) | |
188 | alignment = (size_t) a; | |
189 | ||
190 | p += n; | |
191 | } | |
192 | ||
193 | return alignment; | |
194 | } | |
195 | ||
196 | int bus_gvariant_is_fixed_size(const char *signature) { | |
197 | const char *p; | |
198 | int r; | |
199 | ||
200 | assert(signature); | |
201 | ||
202 | p = signature; | |
203 | while (*p != 0) { | |
204 | size_t n; | |
205 | ||
206 | r = signature_element_length(p, &n); | |
207 | if (r < 0) | |
208 | return r; | |
209 | ||
210 | switch (*p) { | |
211 | ||
212 | case SD_BUS_TYPE_STRING: | |
213 | case SD_BUS_TYPE_OBJECT_PATH: | |
214 | case SD_BUS_TYPE_SIGNATURE: | |
215 | case SD_BUS_TYPE_ARRAY: | |
216 | case SD_BUS_TYPE_VARIANT: | |
217 | return 0; | |
218 | ||
219 | case SD_BUS_TYPE_BYTE: | |
220 | case SD_BUS_TYPE_BOOLEAN: | |
221 | case SD_BUS_TYPE_INT16: | |
222 | case SD_BUS_TYPE_UINT16: | |
223 | case SD_BUS_TYPE_INT32: | |
224 | case SD_BUS_TYPE_UINT32: | |
225 | case SD_BUS_TYPE_UNIX_FD: | |
226 | case SD_BUS_TYPE_INT64: | |
227 | case SD_BUS_TYPE_UINT64: | |
228 | case SD_BUS_TYPE_DOUBLE: | |
229 | break; | |
230 | ||
231 | case SD_BUS_TYPE_STRUCT_BEGIN: | |
232 | case SD_BUS_TYPE_DICT_ENTRY_BEGIN: { | |
233 | char t[n-1]; | |
234 | ||
235 | memcpy(t, p + 1, n - 2); | |
236 | t[n - 2] = 0; | |
237 | ||
238 | r = bus_gvariant_is_fixed_size(t); | |
239 | if (r <= 0) | |
240 | return r; | |
241 | break; | |
242 | } | |
243 | ||
244 | default: | |
245 | assert_not_reached("Unknown signature type"); | |
246 | } | |
247 | ||
248 | p += n; | |
249 | } | |
250 | ||
251 | return true; | |
252 | } | |
2ac7c17f LP |
253 | |
254 | size_t bus_gvariant_determine_word_size(size_t sz, size_t extra) { | |
255 | if (sz + extra <= 0xFF) | |
256 | return 1; | |
257 | else if (sz + extra*2 <= 0xFFFF) | |
258 | return 2; | |
259 | else if (sz + extra*4 <= 0xFFFFFFFF) | |
260 | return 4; | |
261 | else | |
262 | return 8; | |
263 | } | |
264 | ||
265 | size_t bus_gvariant_read_word_le(void *p, size_t sz) { | |
266 | union { | |
267 | uint16_t u16; | |
268 | uint32_t u32; | |
269 | uint64_t u64; | |
270 | } x; | |
271 | ||
272 | assert(p); | |
273 | ||
274 | if (sz == 1) | |
275 | return *(uint8_t*) p; | |
276 | ||
277 | memcpy(&x, p, sz); | |
278 | ||
279 | if (sz == 2) | |
280 | return le16toh(x.u16); | |
281 | else if (sz == 4) | |
282 | return le32toh(x.u32); | |
283 | else if (sz == 8) | |
284 | return le64toh(x.u64); | |
285 | ||
286 | assert_not_reached("unknown word width"); | |
287 | } | |
288 | ||
289 | void bus_gvariant_write_word_le(void *p, size_t sz, size_t value) { | |
290 | union { | |
291 | uint16_t u16; | |
292 | uint32_t u32; | |
293 | uint64_t u64; | |
294 | } x; | |
295 | ||
296 | assert(p); | |
297 | assert(sz == 8 || (value < (1ULL << (sz*8)))); | |
298 | ||
299 | if (sz == 1) { | |
300 | *(uint8_t*) p = value; | |
301 | return; | |
302 | } else if (sz == 2) | |
303 | x.u16 = htole16((uint16_t) value); | |
304 | else if (sz == 4) | |
305 | x.u32 = htole32((uint32_t) value); | |
306 | else if (sz == 8) | |
307 | x.u64 = htole64((uint64_t) value); | |
308 | else | |
309 | assert_not_reached("unknown word width"); | |
310 | ||
311 | memcpy(p, &x, sz); | |
312 | } |