1 /* -*- mode: C; c-file-style: "gnu" -*- */
2 /* dbus-signature.c Routines for reading recursive type signatures
4 * Copyright (C) 2005 Red Hat, Inc.
6 * Licensed under the Academic Free License version 2.1
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 #include "dbus-signature.h"
25 #include "dbus-marshal-recursive.h"
26 #include "dbus-marshal-basic.h"
27 #include "dbus-internals.h"
28 #include "dbus-test.h"
33 unsigned int finished : 1;
34 unsigned int in_array : 1;
35 } DBusSignatureRealIter;
38 * @addtogroup DBusSignature
43 * Initializes a #DBusSignatureIter for reading a type signature. This
44 * function is not safe to use on invalid signatures; be sure to
45 * validate potentially invalid signatures with dbus_signature_validate
46 * before using this function.
48 * @param iter pointer to an iterator to initialize
49 * @param signature the type signature
52 dbus_signature_iter_init (DBusSignatureIter *iter,
53 const char *signature)
55 DBusSignatureRealIter *real_iter = (DBusSignatureRealIter *) iter;
57 real_iter->pos = signature;
58 real_iter->finished = FALSE;
59 real_iter->in_array = FALSE;
63 * Returns the current type pointed to by the iterator.
64 * If the iterator is pointing at a type code such as 's', then
65 * it will be returned directly.
67 * However, when the parser encounters a container type start
68 * character such as '(' for a structure, the corresponding type for
69 * the container will be returned, e.g. DBUS_TYPE_STRUCT, not '('.
70 * In this case, you should initialize a sub-iterator with
71 * dbus_signature_iter_recurse to parse the container type.
73 * @param iter pointer to an iterator
74 * @returns current type (e.g. DBUS_TYPE_STRING, DBUS_TYPE_ARRAY)
77 dbus_signature_iter_get_current_type (const DBusSignatureIter *iter)
79 DBusSignatureRealIter *real_iter = (DBusSignatureRealIter *) iter;
81 return _dbus_first_type_in_signature_c_str (real_iter->pos, 0);
85 * Convenience function for returning the element type of an array;
86 * This function allows you to avoid initializing a sub-iterator and
87 * getting its current type.
89 * It is an error to invoke this function if the current type of the
90 * iterator is not DBUS_TYPE_ARRAY.
92 * @param iter pointer to an iterator
93 * @returns current array element type
96 dbus_signature_iter_get_element_type (const DBusSignatureIter *iter)
98 DBusSignatureRealIter *real_iter = (DBusSignatureRealIter *) iter;
100 _dbus_retur(dbus_signature_iter_get_current_type (iter) == DBUS_TYPE_ARRAY);
102 return _dbus_first_type_in_signature_c_str (real_iter->pos, 1);
106 * Skip to the next value on this "level". e.g. the next field in a
107 * struct, the next value in an array. Returns FALSE at the end of the
110 * @param iter the iterator
111 * @returns FALSE if nothing more to read at or below this level
114 dbus_signature_iter_next (DBusSignatureIter *iter)
116 DBusSignatureRealIter *real_iter = (DBusSignatureRealIter *) iter;
118 if (real_iter->finished)
124 if (real_iter->in_array)
126 real_iter->finished = TRUE;
131 _dbus_type_signature_next (real_iter->pos, &pos);
132 real_iter->pos += pos;
134 if (*real_iter->pos == DBUS_STRUCT_END_CHAR
135 || *real_iter->pos == DBUS_DICT_ENTRY_END_CHAR)
137 real_iter->finished = TRUE;
141 return *real_iter->pos != DBUS_TYPE_INVALID;
146 * Initialize a new iterator pointing to the first type current
147 * container. It's an error to call this if the current type is a
148 * non-container (i.e. if dbus_type_is_container returns FALSE).
150 * @param iter the current interator
151 * @param subiter an iterator to initialize pointing to the first child
154 dbus_signature_iter_recurse (const DBusSignatureIter *iter,
155 DBusSignatureIter *subiter)
157 DBusSignatureRealIter *real_iter = (DBusSignatureRealIter *) iter;
158 DBusSignatureRealIter *real_sub_iter = (DBusSignatureRealIter *) subiter;
160 _dbus_return_if_fail (dbus_type_is_container (dbus_signature_iter_get_current_type (iter)));
162 *real_sub_iter = *real_iter;
163 real_sub_iter->pos++;
165 if (dbus_signature_iter_get_current_type (subiter) == DBUS_TYPE_ARRAY)
166 real_sub_iter->in_array = TRUE;
170 * Check a type signature for validity.
172 * @param signature a potentially invalid type signature
173 * @error error return
174 * @returns TRUE iif signature is valid
177 dbus_signature_validate (const char *signature,
183 _dbus_string_init_const (&str, signature);
184 if (_dbus_validate_signature (&str, 0, _dbus_string_get_length (&str)))
186 dbus_set_error (error, DBUS_ERROR_INVALID_SIGNATURE, "Corrupt type signature");
191 * Check that a type signature is both valid and contains exactly
194 * @param signature a potentially invalid type signature
195 * @error error return
196 * @returns TRUE iif signature is valid and has exactly one complete type
199 dbus_signature_validate_single (const char *signature,
202 DBusSignatureIter iter;
204 if (!dbus_signature_validate (signature, error))
207 dbus_signature_iter_init (&iter, signature);
208 if (dbus_signature_iter_get_current_type (&iter) == DBUS_TYPE_INVALID)
210 if (!dbus_signature_iter_next (&iter))
213 dbus_set_error (error, DBUS_ERROR_INVALID_SIGNATURE, "Exactly one complete type required in signature");
217 /** macro that checks whether a typecode is a container type */
218 #define TYPE_IS_CONTAINER(typecode) \
219 ((typecode) == DBUS_TYPE_STRUCT || \
220 (typecode) == DBUS_TYPE_DICT_ENTRY || \
221 (typecode) == DBUS_TYPE_VARIANT || \
222 (typecode) == DBUS_TYPE_ARRAY)
225 * A "container type" can contain basic types, or nested
226 * container types. #DBUS_TYPE_INVALID is not a container type.
227 * This function will crash if passed a typecode that isn't
230 * @returns #TRUE if type is a container
233 dbus_type_is_container (int typecode)
235 /* only reasonable (non-line-noise) typecodes are allowed */
236 _dbus_return_val_if_fail (_dbus_type_is_valid (typecode) || typecode == DBUS_TYPE_INVALID,
238 return TYPE_IS_CONTAINER (typecode);
242 * A "basic type" is a somewhat arbitrary concept, but the intent
243 * is to include those types that are fully-specified by a single
244 * typecode, with no additional type information or nested
245 * values. So all numbers and strings are basic types and
246 * structs, arrays, and variants are not basic types.
247 * #DBUS_TYPE_INVALID is not a basic type.
249 * This function will crash if passed a typecode that isn't
252 * @returns #TRUE if type is basic
255 dbus_type_is_basic (int typecode)
257 /* only reasonable (non-line-noise) typecodes are allowed */
258 _dbus_return_val_if_fail (_dbus_type_is_valid (typecode) || typecode == DBUS_TYPE_INVALID,
261 /* everything that isn't invalid or a container */
262 return !(typecode == DBUS_TYPE_INVALID || TYPE_IS_CONTAINER (typecode));
266 #ifdef DBUS_BUILD_TESTS
269 * @ingroup DBusSignatureInternals
270 * Unit test for DBusSignature.
272 * @returns #TRUE on success.
275 _dbus_signature_test (void)
277 DBusSignatureIter iter;
278 DBusSignatureIter subiter;
279 DBusSignatureIter subsubiter;
280 DBusSignatureIter subsubsubiter;
283 _dbus_assert (sizeof (DBusSignatureIter) >= sizeof (DBusSignatureRealIter));
286 _dbus_assert (dbus_signature_validate (sig, NULL));
287 _dbus_assert (!dbus_signature_validate_single (sig, NULL));
288 dbus_signature_iter_init (&iter, sig);
289 _dbus_assert (dbus_signature_iter_get_current_type (&iter) == DBUS_TYPE_INVALID);
291 sig = DBUS_TYPE_STRING_AS_STRING;
292 _dbus_assert (dbus_signature_validate (sig, NULL));
293 _dbus_assert (dbus_signature_validate_single (sig, NULL));
294 dbus_signature_iter_init (&iter, sig);
295 _dbus_assert (dbus_signature_iter_get_current_type (&iter) == DBUS_TYPE_STRING);
297 sig = DBUS_TYPE_STRING_AS_STRING DBUS_TYPE_BYTE_AS_STRING;
298 _dbus_assert (dbus_signature_validate (sig, NULL));
299 dbus_signature_iter_init (&iter, sig);
300 _dbus_assert (dbus_signature_iter_get_current_type (&iter) == DBUS_TYPE_STRING);
301 _dbus_assert (dbus_signature_iter_next (&iter));
302 _dbus_assert (dbus_signature_iter_get_current_type (&iter) == DBUS_TYPE_BYTE);
304 sig = DBUS_TYPE_UINT16_AS_STRING
305 DBUS_STRUCT_BEGIN_CHAR_AS_STRING
306 DBUS_TYPE_STRING_AS_STRING
307 DBUS_TYPE_UINT32_AS_STRING
308 DBUS_TYPE_VARIANT_AS_STRING
309 DBUS_TYPE_DOUBLE_AS_STRING
310 DBUS_STRUCT_END_CHAR_AS_STRING;
311 _dbus_assert (dbus_signature_validate (sig, NULL));
312 dbus_signature_iter_init (&iter, sig);
313 _dbus_assert (dbus_signature_iter_get_current_type (&iter) == DBUS_TYPE_UINT16);
314 _dbus_assert (dbus_signature_iter_next (&iter));
315 _dbus_assert (dbus_signature_iter_get_current_type (&iter) == DBUS_TYPE_STRUCT);
316 dbus_signature_iter_recurse (&iter, &subiter);
317 _dbus_assert (dbus_signature_iter_get_current_type (&subiter) == DBUS_TYPE_STRING);
318 _dbus_assert (dbus_signature_iter_next (&subiter));
319 _dbus_assert (dbus_signature_iter_get_current_type (&subiter) == DBUS_TYPE_UINT32);
320 _dbus_assert (dbus_signature_iter_next (&subiter));
321 _dbus_assert (dbus_signature_iter_get_current_type (&subiter) == DBUS_TYPE_VARIANT);
322 _dbus_assert (dbus_signature_iter_next (&subiter));
323 _dbus_assert (dbus_signature_iter_get_current_type (&subiter) == DBUS_TYPE_DOUBLE);
325 sig = DBUS_TYPE_UINT16_AS_STRING
326 DBUS_STRUCT_BEGIN_CHAR_AS_STRING
327 DBUS_TYPE_UINT32_AS_STRING
328 DBUS_TYPE_BYTE_AS_STRING
329 DBUS_TYPE_ARRAY_AS_STRING
330 DBUS_TYPE_ARRAY_AS_STRING
331 DBUS_TYPE_DOUBLE_AS_STRING
332 DBUS_STRUCT_BEGIN_CHAR_AS_STRING
333 DBUS_TYPE_BYTE_AS_STRING
334 DBUS_STRUCT_END_CHAR_AS_STRING
335 DBUS_STRUCT_END_CHAR_AS_STRING;
336 _dbus_assert (dbus_signature_validate (sig, NULL));
337 dbus_signature_iter_init (&iter, sig);
338 _dbus_assert (dbus_signature_iter_get_current_type (&iter) == DBUS_TYPE_UINT16);
339 _dbus_assert (dbus_signature_iter_next (&iter));
340 _dbus_assert (dbus_signature_iter_get_current_type (&iter) == DBUS_TYPE_STRUCT);
341 dbus_signature_iter_recurse (&iter, &subiter);
342 _dbus_assert (dbus_signature_iter_get_current_type (&subiter) == DBUS_TYPE_UINT32);
343 _dbus_assert (dbus_signature_iter_next (&subiter));
344 _dbus_assert (dbus_signature_iter_get_current_type (&subiter) == DBUS_TYPE_BYTE);
345 _dbus_assert (dbus_signature_iter_next (&subiter));
346 _dbus_assert (dbus_signature_iter_get_current_type (&subiter) == DBUS_TYPE_ARRAY);
347 _dbus_assert (dbus_signature_iter_get_element_type (&subiter) == DBUS_TYPE_ARRAY);
349 dbus_signature_iter_recurse (&subiter, &subsubiter);
350 _dbus_assert (dbus_signature_iter_get_current_type (&subsubiter) == DBUS_TYPE_ARRAY);
351 _dbus_assert (dbus_signature_iter_get_element_type (&subsubiter) == DBUS_TYPE_DOUBLE);
353 dbus_signature_iter_recurse (&subsubiter, &subsubsubiter);
354 _dbus_assert (dbus_signature_iter_get_current_type (&subsubsubiter) == DBUS_TYPE_DOUBLE);
355 _dbus_assert (dbus_signature_iter_next (&subiter));
356 _dbus_assert (dbus_signature_iter_get_current_type (&subiter) == DBUS_TYPE_STRUCT);
357 dbus_signature_iter_recurse (&subiter, &subsubiter);
358 _dbus_assert (dbus_signature_iter_get_current_type (&subsubiter) == DBUS_TYPE_BYTE);
360 sig = DBUS_TYPE_ARRAY_AS_STRING
361 DBUS_DICT_ENTRY_BEGIN_CHAR_AS_STRING
362 DBUS_TYPE_INT16_AS_STRING
363 DBUS_TYPE_STRING_AS_STRING
364 DBUS_DICT_ENTRY_END_CHAR_AS_STRING
365 DBUS_TYPE_VARIANT_AS_STRING;
366 _dbus_assert (dbus_signature_validate (sig, NULL));
367 _dbus_assert (!dbus_signature_validate_single (sig, NULL));
368 dbus_signature_iter_init (&iter, sig);
369 _dbus_assert (dbus_signature_iter_get_current_type (&iter) == DBUS_TYPE_ARRAY);
370 _dbus_assert (dbus_signature_iter_get_element_type (&iter) == DBUS_TYPE_DICT_ENTRY);
372 dbus_signature_iter_recurse (&iter, &subiter);
373 dbus_signature_iter_recurse (&subiter, &subsubiter);
374 _dbus_assert (dbus_signature_iter_get_current_type (&subsubiter) == DBUS_TYPE_INT16);
375 _dbus_assert (dbus_signature_iter_next (&subsubiter));
376 _dbus_assert (dbus_signature_iter_get_current_type (&subsubiter) == DBUS_TYPE_STRING);
377 _dbus_assert (!dbus_signature_iter_next (&subsubiter));
379 _dbus_assert (dbus_signature_iter_next (&iter));
380 _dbus_assert (dbus_signature_iter_get_current_type (&iter) == DBUS_TYPE_VARIANT);
381 _dbus_assert (!dbus_signature_iter_next (&iter));
383 sig = DBUS_TYPE_DICT_ENTRY_AS_STRING;
384 _dbus_assert (!dbus_signature_validate (sig, NULL));
386 sig = DBUS_TYPE_ARRAY_AS_STRING;
387 _dbus_assert (!dbus_signature_validate (sig, NULL));
389 sig = DBUS_TYPE_UINT32_AS_STRING
390 DBUS_TYPE_ARRAY_AS_STRING;
391 _dbus_assert (!dbus_signature_validate (sig, NULL));
393 sig = DBUS_TYPE_ARRAY_AS_STRING
394 DBUS_TYPE_DICT_ENTRY_AS_STRING;
395 _dbus_assert (!dbus_signature_validate (sig, NULL));
397 sig = DBUS_DICT_ENTRY_BEGIN_CHAR_AS_STRING;
398 _dbus_assert (!dbus_signature_validate (sig, NULL));
400 sig = DBUS_DICT_ENTRY_END_CHAR_AS_STRING;
401 _dbus_assert (!dbus_signature_validate (sig, NULL));
403 sig = DBUS_DICT_ENTRY_BEGIN_CHAR_AS_STRING
404 DBUS_TYPE_INT32_AS_STRING;
405 _dbus_assert (!dbus_signature_validate (sig, NULL));
407 sig = DBUS_DICT_ENTRY_BEGIN_CHAR_AS_STRING
408 DBUS_TYPE_INT32_AS_STRING
409 DBUS_TYPE_STRING_AS_STRING;
410 _dbus_assert (!dbus_signature_validate (sig, NULL));
412 sig = DBUS_STRUCT_END_CHAR_AS_STRING
413 DBUS_STRUCT_BEGIN_CHAR_AS_STRING;
414 _dbus_assert (!dbus_signature_validate (sig, NULL));
416 sig = DBUS_STRUCT_BEGIN_CHAR_AS_STRING
417 DBUS_TYPE_BOOLEAN_AS_STRING;
418 _dbus_assert (!dbus_signature_validate (sig, NULL));
422 _dbus_assert_not_reached ("out of memory");
429 /** @} */ /* end of DBusSignature group */