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 * @defgroup DBusSignature Type signature parsing
40 * @brief Parsing D-BUS type signatures
45 * Initializes a #DBusSignatureIter for reading a type signature. This
46 * function is not safe to use on invalid signatures; be sure to
47 * validate potentially invalid signatures with dbus_signature_validate
48 * before using this function.
50 * @param iter pointer to an iterator to initialize
51 * @param signature the type signature
54 dbus_signature_iter_init (DBusSignatureIter *iter,
55 const char *signature)
57 DBusSignatureRealIter *real_iter = (DBusSignatureRealIter *) iter;
59 real_iter->pos = signature;
60 real_iter->finished = FALSE;
61 real_iter->in_array = FALSE;
65 * Returns the current type pointed to by the iterator.
66 * If the iterator is pointing at a type code such as 's', then
67 * it will be returned directly.
69 * However, when the parser encounters a container type start
70 * character such as '(' for a structure, the corresponding type for
71 * the container will be returned, e.g. DBUS_TYPE_STRUCT, not '('.
72 * In this case, you should initialize a sub-iterator with
73 * dbus_signature_iter_recurse to parse the container type.
75 * @param iter pointer to an iterator
76 * @returns current type (e.g. DBUS_TYPE_STRING, DBUS_TYPE_ARRAY)
79 dbus_signature_iter_get_current_type (const DBusSignatureIter *iter)
81 DBusSignatureRealIter *real_iter = (DBusSignatureRealIter *) iter;
83 return _dbus_first_type_in_signature_c_str (real_iter->pos, 0);
87 * Returns the full type signature represented by the current
88 * iterator as a C string.
90 * @param iter pointer to an iterator
91 * @returns current signature; or NULL on OOM. Should be freed with #dbus_free
94 dbus_signature_iter_get_signature (const DBusSignatureIter *iter)
96 DBusSignatureRealIter *real_iter = (DBusSignatureRealIter *) iter;
101 if (!_dbus_string_init (&str))
105 _dbus_type_signature_next (real_iter->pos, &pos);
107 if (!_dbus_string_append_len (&str, real_iter->pos, pos))
109 if (!_dbus_string_steal_data (&str, &ret))
111 _dbus_string_free (&str);
117 * Convenience function for returning the element type of an array;
118 * This function allows you to avoid initializing a sub-iterator and
119 * getting its current type.
121 * It is an error to invoke this function if the current type of the
122 * iterator is not DBUS_TYPE_ARRAY.
124 * @param iter pointer to an iterator
125 * @returns current array element type
128 dbus_signature_iter_get_element_type (const DBusSignatureIter *iter)
130 DBusSignatureRealIter *real_iter = (DBusSignatureRealIter *) iter;
132 _dbus_return_val_if_fail (dbus_signature_iter_get_current_type (iter) == DBUS_TYPE_ARRAY, DBUS_TYPE_INVALID);
134 return _dbus_first_type_in_signature_c_str (real_iter->pos, 1);
138 * Skip to the next value on this "level". e.g. the next field in a
139 * struct, the next value in an array. Returns FALSE at the end of the
142 * @param iter the iterator
143 * @returns FALSE if nothing more to read at or below this level
146 dbus_signature_iter_next (DBusSignatureIter *iter)
148 DBusSignatureRealIter *real_iter = (DBusSignatureRealIter *) iter;
150 if (real_iter->finished)
156 if (real_iter->in_array)
158 real_iter->finished = TRUE;
163 _dbus_type_signature_next (real_iter->pos, &pos);
164 real_iter->pos += pos;
166 if (*real_iter->pos == DBUS_STRUCT_END_CHAR
167 || *real_iter->pos == DBUS_DICT_ENTRY_END_CHAR)
169 real_iter->finished = TRUE;
173 return *real_iter->pos != DBUS_TYPE_INVALID;
178 * Initialize a new iterator pointing to the first type current
179 * container. It's an error to call this if the current type is a
180 * non-container (i.e. if dbus_type_is_container returns FALSE).
182 * @param iter the current interator
183 * @param subiter an iterator to initialize pointing to the first child
186 dbus_signature_iter_recurse (const DBusSignatureIter *iter,
187 DBusSignatureIter *subiter)
189 DBusSignatureRealIter *real_iter = (DBusSignatureRealIter *) iter;
190 DBusSignatureRealIter *real_sub_iter = (DBusSignatureRealIter *) subiter;
192 _dbus_return_if_fail (dbus_type_is_container (dbus_signature_iter_get_current_type (iter)));
194 *real_sub_iter = *real_iter;
195 real_sub_iter->pos++;
197 if (dbus_signature_iter_get_current_type (subiter) == DBUS_TYPE_ARRAY)
198 real_sub_iter->in_array = TRUE;
202 * Check a type signature for validity.
204 * @param signature a potentially invalid type signature
205 * @param error error return
206 * @returns TRUE iif signature is valid
209 dbus_signature_validate (const char *signature,
215 _dbus_string_init_const (&str, signature);
216 if (_dbus_validate_signature (&str, 0, _dbus_string_get_length (&str)))
218 dbus_set_error (error, DBUS_ERROR_INVALID_SIGNATURE, "Corrupt type signature");
223 * Check that a type signature is both valid and contains exactly
226 * @param signature a potentially invalid type signature
227 * @param error error return
228 * @returns TRUE iif signature is valid and has exactly one complete type
231 dbus_signature_validate_single (const char *signature,
234 DBusSignatureIter iter;
236 if (!dbus_signature_validate (signature, error))
239 dbus_signature_iter_init (&iter, signature);
240 if (dbus_signature_iter_get_current_type (&iter) == DBUS_TYPE_INVALID)
242 if (!dbus_signature_iter_next (&iter))
245 dbus_set_error (error, DBUS_ERROR_INVALID_SIGNATURE, "Exactly one complete type required in signature");
249 /** macro that checks whether a typecode is a container type */
250 #define TYPE_IS_CONTAINER(typecode) \
251 ((typecode) == DBUS_TYPE_STRUCT || \
252 (typecode) == DBUS_TYPE_DICT_ENTRY || \
253 (typecode) == DBUS_TYPE_VARIANT || \
254 (typecode) == DBUS_TYPE_ARRAY)
257 * A "container type" can contain basic types, or nested
258 * container types. #DBUS_TYPE_INVALID is not a container type.
259 * This function will crash if passed a typecode that isn't
262 * @returns #TRUE if type is a container
265 dbus_type_is_container (int typecode)
267 /* only reasonable (non-line-noise) typecodes are allowed */
268 _dbus_return_val_if_fail (_dbus_type_is_valid (typecode) || typecode == DBUS_TYPE_INVALID,
270 return TYPE_IS_CONTAINER (typecode);
274 * A "basic type" is a somewhat arbitrary concept, but the intent
275 * is to include those types that are fully-specified by a single
276 * typecode, with no additional type information or nested
277 * values. So all numbers and strings are basic types and
278 * structs, arrays, and variants are not basic types.
279 * #DBUS_TYPE_INVALID is not a basic type.
281 * This function will crash if passed a typecode that isn't
284 * @returns #TRUE if type is basic
287 dbus_type_is_basic (int typecode)
289 /* only reasonable (non-line-noise) typecodes are allowed */
290 _dbus_return_val_if_fail (_dbus_type_is_valid (typecode) || typecode == DBUS_TYPE_INVALID,
293 /* everything that isn't invalid or a container */
294 return !(typecode == DBUS_TYPE_INVALID || TYPE_IS_CONTAINER (typecode));
298 * Tells you whether values of this type can change length if you set
299 * them to some other value. For this purpose, you assume that the
300 * first byte of the old and new value would be in the same location,
301 * so alignment padding is not a factor.
303 * This function is useful to determine whether #dbus_message_iter_get_fixed_array
306 * @returns #FALSE if the type can occupy different lengths
309 dbus_type_is_fixed (int typecode)
314 case DBUS_TYPE_BOOLEAN:
315 case DBUS_TYPE_INT16:
316 case DBUS_TYPE_UINT16:
317 case DBUS_TYPE_INT32:
318 case DBUS_TYPE_UINT32:
319 case DBUS_TYPE_INT64:
320 case DBUS_TYPE_UINT64:
321 case DBUS_TYPE_DOUBLE:
328 #ifdef DBUS_BUILD_TESTS
331 * @ingroup DBusSignatureInternals
332 * Unit test for DBusSignature.
334 * @returns #TRUE on success.
337 _dbus_signature_test (void)
339 DBusSignatureIter iter;
340 DBusSignatureIter subiter;
341 DBusSignatureIter subsubiter;
342 DBusSignatureIter subsubsubiter;
345 _dbus_assert (sizeof (DBusSignatureIter) >= sizeof (DBusSignatureRealIter));
348 _dbus_assert (dbus_signature_validate (sig, NULL));
349 _dbus_assert (!dbus_signature_validate_single (sig, NULL));
350 dbus_signature_iter_init (&iter, sig);
351 _dbus_assert (dbus_signature_iter_get_current_type (&iter) == DBUS_TYPE_INVALID);
353 sig = DBUS_TYPE_STRING_AS_STRING;
354 _dbus_assert (dbus_signature_validate (sig, NULL));
355 _dbus_assert (dbus_signature_validate_single (sig, NULL));
356 dbus_signature_iter_init (&iter, sig);
357 _dbus_assert (dbus_signature_iter_get_current_type (&iter) == DBUS_TYPE_STRING);
359 sig = DBUS_TYPE_STRING_AS_STRING DBUS_TYPE_BYTE_AS_STRING;
360 _dbus_assert (dbus_signature_validate (sig, NULL));
361 dbus_signature_iter_init (&iter, sig);
362 _dbus_assert (dbus_signature_iter_get_current_type (&iter) == DBUS_TYPE_STRING);
363 _dbus_assert (dbus_signature_iter_next (&iter));
364 _dbus_assert (dbus_signature_iter_get_current_type (&iter) == DBUS_TYPE_BYTE);
366 sig = DBUS_TYPE_UINT16_AS_STRING
367 DBUS_STRUCT_BEGIN_CHAR_AS_STRING
368 DBUS_TYPE_STRING_AS_STRING
369 DBUS_TYPE_UINT32_AS_STRING
370 DBUS_TYPE_VARIANT_AS_STRING
371 DBUS_TYPE_DOUBLE_AS_STRING
372 DBUS_STRUCT_END_CHAR_AS_STRING;
373 _dbus_assert (dbus_signature_validate (sig, NULL));
374 dbus_signature_iter_init (&iter, sig);
375 _dbus_assert (dbus_signature_iter_get_current_type (&iter) == DBUS_TYPE_UINT16);
376 _dbus_assert (dbus_signature_iter_next (&iter));
377 _dbus_assert (dbus_signature_iter_get_current_type (&iter) == DBUS_TYPE_STRUCT);
378 dbus_signature_iter_recurse (&iter, &subiter);
379 _dbus_assert (dbus_signature_iter_get_current_type (&subiter) == DBUS_TYPE_STRING);
380 _dbus_assert (dbus_signature_iter_next (&subiter));
381 _dbus_assert (dbus_signature_iter_get_current_type (&subiter) == DBUS_TYPE_UINT32);
382 _dbus_assert (dbus_signature_iter_next (&subiter));
383 _dbus_assert (dbus_signature_iter_get_current_type (&subiter) == DBUS_TYPE_VARIANT);
384 _dbus_assert (dbus_signature_iter_next (&subiter));
385 _dbus_assert (dbus_signature_iter_get_current_type (&subiter) == DBUS_TYPE_DOUBLE);
387 sig = DBUS_TYPE_UINT16_AS_STRING
388 DBUS_STRUCT_BEGIN_CHAR_AS_STRING
389 DBUS_TYPE_UINT32_AS_STRING
390 DBUS_TYPE_BYTE_AS_STRING
391 DBUS_TYPE_ARRAY_AS_STRING
392 DBUS_TYPE_ARRAY_AS_STRING
393 DBUS_TYPE_DOUBLE_AS_STRING
394 DBUS_STRUCT_BEGIN_CHAR_AS_STRING
395 DBUS_TYPE_BYTE_AS_STRING
396 DBUS_STRUCT_END_CHAR_AS_STRING
397 DBUS_STRUCT_END_CHAR_AS_STRING;
398 _dbus_assert (dbus_signature_validate (sig, NULL));
399 dbus_signature_iter_init (&iter, sig);
400 _dbus_assert (dbus_signature_iter_get_current_type (&iter) == DBUS_TYPE_UINT16);
401 _dbus_assert (dbus_signature_iter_next (&iter));
402 _dbus_assert (dbus_signature_iter_get_current_type (&iter) == DBUS_TYPE_STRUCT);
403 dbus_signature_iter_recurse (&iter, &subiter);
404 _dbus_assert (dbus_signature_iter_get_current_type (&subiter) == DBUS_TYPE_UINT32);
405 _dbus_assert (dbus_signature_iter_next (&subiter));
406 _dbus_assert (dbus_signature_iter_get_current_type (&subiter) == DBUS_TYPE_BYTE);
407 _dbus_assert (dbus_signature_iter_next (&subiter));
408 _dbus_assert (dbus_signature_iter_get_current_type (&subiter) == DBUS_TYPE_ARRAY);
409 _dbus_assert (dbus_signature_iter_get_element_type (&subiter) == DBUS_TYPE_ARRAY);
411 dbus_signature_iter_recurse (&subiter, &subsubiter);
412 _dbus_assert (dbus_signature_iter_get_current_type (&subsubiter) == DBUS_TYPE_ARRAY);
413 _dbus_assert (dbus_signature_iter_get_element_type (&subsubiter) == DBUS_TYPE_DOUBLE);
415 dbus_signature_iter_recurse (&subsubiter, &subsubsubiter);
416 _dbus_assert (dbus_signature_iter_get_current_type (&subsubsubiter) == DBUS_TYPE_DOUBLE);
417 _dbus_assert (dbus_signature_iter_next (&subiter));
418 _dbus_assert (dbus_signature_iter_get_current_type (&subiter) == DBUS_TYPE_STRUCT);
419 dbus_signature_iter_recurse (&subiter, &subsubiter);
420 _dbus_assert (dbus_signature_iter_get_current_type (&subsubiter) == DBUS_TYPE_BYTE);
422 sig = DBUS_TYPE_ARRAY_AS_STRING
423 DBUS_DICT_ENTRY_BEGIN_CHAR_AS_STRING
424 DBUS_TYPE_INT16_AS_STRING
425 DBUS_TYPE_STRING_AS_STRING
426 DBUS_DICT_ENTRY_END_CHAR_AS_STRING
427 DBUS_TYPE_VARIANT_AS_STRING;
428 _dbus_assert (dbus_signature_validate (sig, NULL));
429 _dbus_assert (!dbus_signature_validate_single (sig, NULL));
430 dbus_signature_iter_init (&iter, sig);
431 _dbus_assert (dbus_signature_iter_get_current_type (&iter) == DBUS_TYPE_ARRAY);
432 _dbus_assert (dbus_signature_iter_get_element_type (&iter) == DBUS_TYPE_DICT_ENTRY);
434 dbus_signature_iter_recurse (&iter, &subiter);
435 dbus_signature_iter_recurse (&subiter, &subsubiter);
436 _dbus_assert (dbus_signature_iter_get_current_type (&subsubiter) == DBUS_TYPE_INT16);
437 _dbus_assert (dbus_signature_iter_next (&subsubiter));
438 _dbus_assert (dbus_signature_iter_get_current_type (&subsubiter) == DBUS_TYPE_STRING);
439 _dbus_assert (!dbus_signature_iter_next (&subsubiter));
441 _dbus_assert (dbus_signature_iter_next (&iter));
442 _dbus_assert (dbus_signature_iter_get_current_type (&iter) == DBUS_TYPE_VARIANT);
443 _dbus_assert (!dbus_signature_iter_next (&iter));
445 sig = DBUS_TYPE_DICT_ENTRY_AS_STRING;
446 _dbus_assert (!dbus_signature_validate (sig, NULL));
448 sig = DBUS_TYPE_ARRAY_AS_STRING;
449 _dbus_assert (!dbus_signature_validate (sig, NULL));
451 sig = DBUS_TYPE_UINT32_AS_STRING
452 DBUS_TYPE_ARRAY_AS_STRING;
453 _dbus_assert (!dbus_signature_validate (sig, NULL));
455 sig = DBUS_TYPE_ARRAY_AS_STRING
456 DBUS_TYPE_DICT_ENTRY_AS_STRING;
457 _dbus_assert (!dbus_signature_validate (sig, NULL));
459 sig = DBUS_DICT_ENTRY_BEGIN_CHAR_AS_STRING;
460 _dbus_assert (!dbus_signature_validate (sig, NULL));
462 sig = DBUS_DICT_ENTRY_END_CHAR_AS_STRING;
463 _dbus_assert (!dbus_signature_validate (sig, NULL));
465 sig = DBUS_DICT_ENTRY_BEGIN_CHAR_AS_STRING
466 DBUS_TYPE_INT32_AS_STRING;
467 _dbus_assert (!dbus_signature_validate (sig, NULL));
469 sig = DBUS_DICT_ENTRY_BEGIN_CHAR_AS_STRING
470 DBUS_TYPE_INT32_AS_STRING
471 DBUS_TYPE_STRING_AS_STRING;
472 _dbus_assert (!dbus_signature_validate (sig, NULL));
474 sig = DBUS_STRUCT_END_CHAR_AS_STRING
475 DBUS_STRUCT_BEGIN_CHAR_AS_STRING;
476 _dbus_assert (!dbus_signature_validate (sig, NULL));
478 sig = DBUS_STRUCT_BEGIN_CHAR_AS_STRING
479 DBUS_TYPE_BOOLEAN_AS_STRING;
480 _dbus_assert (!dbus_signature_validate (sig, NULL));
484 _dbus_assert_not_reached ("out of memory");
491 /** @} */ /* end of DBusSignature group */