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5cd6d0e5 | 1 | /* |
0235b0db | 2 | * SPDX-License-Identifier: MIT |
5cd6d0e5 PP |
3 | * |
4 | * Copyright (c) 2015-2016 EfficiOS Inc. and Linux Foundation | |
5 | * Copyright (c) 2015-2016 Philippe Proulx <pproulx@efficios.com> | |
6 | * | |
0235b0db | 7 | * Babeltrace - CTF binary field class reader (BFCR) |
5cd6d0e5 PP |
8 | */ |
9 | ||
0235b0db MJ |
10 | #ifndef CTF_BFCR_H |
11 | #define CTF_BFCR_H | |
12 | ||
5cd6d0e5 | 13 | #include <stddef.h> |
c802cacb | 14 | #include <stdint.h> |
c802cacb | 15 | |
3fadfbc0 | 16 | #include <babeltrace2/babeltrace.h> |
c802cacb | 17 | |
0f5c5d5c SM |
18 | #include "cpp-common/vendor/fmt/format.h" /* IWYU pragma: keep */ |
19 | ||
5656cea5 | 20 | #include "../metadata/tsdl/ctf-meta.hpp" |
7ece2fc0 | 21 | |
0f5c5d5c SM |
22 | namespace bt2c { |
23 | ||
24 | class Logger; | |
25 | ||
26 | } /* namespace bt2c */ | |
27 | ||
5cd6d0e5 PP |
28 | /** |
29 | * @file bfcr.h | |
30 | * | |
31 | * Event-driven CTF binary field class reader (BFCR). | |
32 | * | |
33 | * This is a common, internal API used by CTF source plugins. It allows | |
34 | * a binary CTF IR field class to be decoded from user-provided buffers. | |
35 | * As the class is decoded (and, possibly, its nested classes), | |
36 | * registered user callback functions are called. | |
37 | * | |
38 | * This API is only concerned with reading one CTF class at a time from | |
39 | * one or more buffer of bytes. It does not know CTF dynamic scopes, | |
40 | * events, or streams. Sequence lengths and selected variant classes are | |
41 | * requested to the user when needed. | |
42 | */ | |
43 | ||
44 | /** | |
45 | * Binary class reader API status codes. | |
46 | */ | |
4164020e SM |
47 | enum bt_bfcr_status |
48 | { | |
49 | /** Out of memory. */ | |
50 | BT_BFCR_STATUS_ENOMEM = -5, | |
51 | /** | |
52 | * The binary stream reader reached the end of the user-provided | |
53 | * buffer, but data is still needed to finish decoding the | |
54 | * requested class. | |
55 | * | |
56 | * The user needs to call bt_bfcr_continue() as long as | |
57 | * #BT_BFCR_STATUS_EOF is returned to complete the decoding | |
58 | * process of a given class. | |
59 | */ | |
60 | BT_BFCR_STATUS_EOF = 1, | |
5cd6d0e5 | 61 | |
4164020e SM |
62 | /** Invalid argument. */ |
63 | BT_BFCR_STATUS_INVAL = -3, | |
5cd6d0e5 | 64 | |
4164020e SM |
65 | /** General error. */ |
66 | BT_BFCR_STATUS_ERROR = -1, | |
5cd6d0e5 | 67 | |
4164020e SM |
68 | /** Everything okay. */ |
69 | BT_BFCR_STATUS_OK = 0, | |
5cd6d0e5 PP |
70 | }; |
71 | ||
0f5c5d5c SM |
72 | inline const char *format_as(bt_bfcr_status status) noexcept |
73 | { | |
74 | switch (status) { | |
75 | case BT_BFCR_STATUS_ENOMEM: | |
76 | return "BT_BFCR_STATUS_ENOMEM"; | |
77 | ||
78 | case BT_BFCR_STATUS_EOF: | |
79 | return "BT_BFCR_STATUS_EOF"; | |
80 | ||
81 | case BT_BFCR_STATUS_INVAL: | |
82 | return "BT_BFCR_STATUS_INVAL"; | |
83 | ||
84 | case BT_BFCR_STATUS_ERROR: | |
85 | return "BT_BFCR_STATUS_ERROR"; | |
86 | ||
87 | case BT_BFCR_STATUS_OK: | |
88 | return "BT_BFCR_STATUS_OK"; | |
89 | break; | |
90 | } | |
91 | ||
92 | bt_common_abort(); | |
93 | } | |
94 | ||
4164020e SM |
95 | typedef enum bt_bfcr_status (*bt_bfcr_unsigned_int_cb_func)(uint64_t, struct ctf_field_class *, |
96 | void *); | |
5cd6d0e5 PP |
97 | |
98 | /* | |
99 | * Field class reader user callback functions. | |
100 | */ | |
4164020e SM |
101 | struct bt_bfcr_cbs |
102 | { | |
103 | /** | |
104 | * Field class callback functions. | |
105 | * | |
106 | * This CTF binary class reader is event-driven. The following | |
107 | * functions are called during the decoding process, either when | |
108 | * a compound class begins/ends, or when a basic class is | |
109 | * completely decoded (along with its value). | |
110 | * | |
111 | * Each function also receives the CTF field class associated | |
112 | * with the call, and user data (registered to the class reader | |
113 | * calling them). | |
114 | * | |
115 | * Actual trace IR fields are \em not created here; this would | |
116 | * be the responsibility of a class reader's user (the provider | |
117 | * of those callback functions). | |
118 | * | |
119 | * All the class callback functions return one of the following | |
120 | * values: | |
121 | * | |
122 | * - <b>#BT_BFCR_STATUS_OK</b>: Everything is okay; | |
123 | * continue the decoding process. | |
124 | * - <b>#BT_BFCR_STATUS_ERROR</b>: General error (reported | |
125 | * to class reader's user). | |
126 | * | |
127 | * Any member of this structure may be set to \c NULL, should | |
128 | * a specific message be not needed. | |
129 | */ | |
130 | struct | |
131 | { | |
132 | /** | |
133 | * Called when a signed integer class is completely | |
134 | * decoded. This could also be the supporting signed | |
135 | * integer class of an enumeration class (\p class will | |
136 | * indicate this). | |
137 | * | |
138 | * @param value Signed integer value | |
139 | * @param class Integer or enumeration class | |
140 | * @param data User data | |
141 | * @returns #BT_BFCR_STATUS_OK or | |
142 | * #BT_BFCR_STATUS_ERROR | |
143 | */ | |
144 | enum bt_bfcr_status (*signed_int)(int64_t value, struct ctf_field_class *cls, void *data); | |
5cd6d0e5 | 145 | |
4164020e SM |
146 | /** |
147 | * Called when an unsigned integer class is completely | |
148 | * decoded. This could also be the supporting signed | |
149 | * integer class of an enumeration class (\p class will | |
150 | * indicate this). | |
151 | * | |
152 | * @param value Unsigned integer value | |
153 | * @param class Integer or enumeration class | |
154 | * @param data User data | |
155 | * @returns #BT_BFCR_STATUS_OK or | |
156 | * #BT_BFCR_STATUS_ERROR | |
157 | */ | |
158 | bt_bfcr_unsigned_int_cb_func unsigned_int; | |
5cd6d0e5 | 159 | |
4164020e SM |
160 | /** |
161 | * Called when a floating point number class is | |
162 | * completely decoded. | |
163 | * | |
164 | * @param value Floating point number value | |
165 | * @param class Floating point number class | |
166 | * @param data User data | |
167 | * @returns #BT_BFCR_STATUS_OK or | |
168 | * #BT_BFCR_STATUS_ERROR | |
169 | */ | |
170 | enum bt_bfcr_status (*floating_point)(double value, struct ctf_field_class *cls, | |
171 | void *data); | |
5cd6d0e5 | 172 | |
4164020e SM |
173 | /** |
174 | * Called when a string class begins. | |
175 | * | |
176 | * All the following user callback function calls will | |
177 | * be made to bt_bfcr_cbs::classes::string(), each of | |
178 | * them providing one substring of the complete string | |
179 | * class's value. | |
180 | * | |
181 | * @param class Beginning string class | |
182 | * @param data User data | |
183 | * @returns #BT_BFCR_STATUS_OK or | |
184 | * #BT_BFCR_STATUS_ERROR | |
185 | */ | |
186 | enum bt_bfcr_status (*string_begin)(struct ctf_field_class *cls, void *data); | |
5cd6d0e5 | 187 | |
4164020e SM |
188 | /** |
189 | * Called when a string class's substring is decoded | |
190 | * (between a call to bt_bfcr_cbs::classes::string_begin() | |
191 | * and a call to bt_bfcr_cbs::classes::string_end()). | |
192 | * | |
193 | * @param value String value (\em not null-terminated) | |
194 | * @param len String value length | |
195 | * @param class String class | |
196 | * @param data User data | |
197 | * @returns #BT_BFCR_STATUS_OK or | |
198 | * #BT_BFCR_STATUS_ERROR | |
199 | */ | |
200 | enum bt_bfcr_status (*string)(const char *value, size_t len, struct ctf_field_class *cls, | |
201 | void *data); | |
5cd6d0e5 | 202 | |
4164020e SM |
203 | /** |
204 | * Called when a string class ends. | |
205 | * | |
206 | * @param class Ending string class | |
207 | * @param data User data | |
208 | * @returns #BT_BFCR_STATUS_OK or | |
209 | * #BT_BFCR_STATUS_ERROR | |
210 | */ | |
211 | enum bt_bfcr_status (*string_end)(struct ctf_field_class *cls, void *data); | |
5cd6d0e5 | 212 | |
4164020e SM |
213 | /** |
214 | * Called when a compound class begins. | |
215 | * | |
216 | * All the following class callback function calls will | |
217 | * signal sequential elements of this compound class, | |
218 | * until the next corresponding | |
219 | * bt_bfcr_cbs::classes::compound_end() is called. | |
220 | * | |
221 | * If \p class is a variant class, then only one class | |
222 | * callback function call will follow before the call to | |
223 | * bt_bfcr_cbs::classes::compound_end(). This single | |
224 | * call indicates the selected class of this variant | |
225 | * class. | |
226 | * | |
227 | * @param class Beginning compound class | |
228 | * @param data User data | |
229 | * @returns #BT_BFCR_STATUS_OK or | |
230 | * #BT_BFCR_STATUS_ERROR | |
231 | */ | |
232 | enum bt_bfcr_status (*compound_begin)(struct ctf_field_class *cls, void *data); | |
5cd6d0e5 | 233 | |
4164020e SM |
234 | /** |
235 | * Called when a compound class ends. | |
236 | * | |
237 | * @param class Ending compound class | |
238 | * @param data User data | |
239 | * @returns #BT_BFCR_STATUS_OK or | |
240 | * #BT_BFCR_STATUS_ERROR | |
241 | */ | |
242 | enum bt_bfcr_status (*compound_end)(struct ctf_field_class *cls, void *data); | |
243 | } classes; | |
5cd6d0e5 | 244 | |
4164020e SM |
245 | /** |
246 | * Query callback functions are used when the class reader needs | |
247 | * dynamic information, i.e. a sequence class's current length | |
248 | * or a variant class's current selected class. | |
249 | * | |
250 | * Both functions need to be set unless it is known that no | |
251 | * sequences or variants will have to be decoded. | |
252 | */ | |
253 | struct | |
254 | { | |
255 | /** | |
256 | * Called to query the current length of a given sequence | |
257 | * class. | |
258 | * | |
259 | * @param class Sequence class | |
260 | * @param data User data | |
261 | * @returns Sequence length or | |
262 | * #BT_BFCR_STATUS_ERROR on error | |
263 | */ | |
264 | int64_t (*get_sequence_length)(struct ctf_field_class *cls, void *data); | |
5cd6d0e5 | 265 | |
4164020e SM |
266 | /** |
267 | * Called to query the current selected class of a given | |
268 | * variant class. | |
269 | * | |
270 | * @param class Variant class | |
271 | * @param data User data | |
272 | * @returns Current selected class (owned by | |
273 | * this) or \c NULL on error | |
274 | */ | |
275 | struct ctf_field_class *(*borrow_variant_selected_field_class)(struct ctf_field_class *cls, | |
276 | void *data); | |
277 | } query; | |
5cd6d0e5 PP |
278 | }; |
279 | ||
280 | /** | |
281 | * Creates a CTF binary class reader. | |
282 | * | |
283 | * @param cbs User callback functions | |
284 | * @param data User data (passed to user callback functions) | |
285 | * @returns New binary class reader on success, or \c NULL on error | |
286 | */ | |
0f5c5d5c | 287 | struct bt_bfcr *bt_bfcr_create(struct bt_bfcr_cbs cbs, void *data, const bt2c::Logger& logger); |
5cd6d0e5 PP |
288 | |
289 | /** | |
290 | * Destroys a CTF binary class reader, freeing all internal resources. | |
291 | * | |
292 | * @param bfcr Binary class reader | |
293 | */ | |
5cd6d0e5 PP |
294 | void bt_bfcr_destroy(struct bt_bfcr *bfcr); |
295 | ||
296 | /** | |
297 | * Decodes a given CTF class from a buffer of bytes. | |
298 | * | |
299 | * The number of \em bits consumed by this function is returned. | |
300 | * | |
301 | * The \p status output parameter is where a status is written, amongst | |
302 | * the following: | |
303 | * | |
304 | * - <b>#BT_BFCR_STATUS_OK</b>: Decoding is done. | |
305 | * - <b>#BT_BFCR_STATUS_EOF</b>: The end of the buffer was reached, | |
306 | * but more data is needed to finish the decoding process of the | |
307 | * requested class. The user needs to call bt_bfcr_continue() | |
308 | * as long as #BT_BFCR_STATUS_EOF is returned to complete the | |
309 | * decoding process of the original class. | |
310 | * - <b>#BT_BFCR_STATUS_INVAL</b>: Invalid argument. | |
311 | * - <b>#BT_BFCR_STATUS_ERROR</b>: General error. | |
312 | * | |
313 | * Calling this function resets the class reader's internal state. If | |
314 | * #BT_BFCR_STATUS_EOF is returned, bt_bfcr_continue() needs to | |
315 | * be called next, \em not bt_bfcr_decode(). | |
316 | * | |
317 | * @param bfcr Binary class reader | |
318 | * @param class Field class to decode | |
319 | * @param buf Buffer | |
320 | * @param offset Offset of first bit from \p buf (bits) | |
321 | * @param packet_offset Offset of \p offset within the CTF | |
322 | * binary packet containing \p class (bits) | |
323 | * @param sz Size of buffer in bytes (from \p buf) | |
324 | * @param status Returned status (see description above) | |
325 | * @returns Number of consumed bits | |
326 | */ | |
4164020e SM |
327 | size_t bt_bfcr_start(struct bt_bfcr *bfcr, struct ctf_field_class *cls, const uint8_t *buf, |
328 | size_t offset, size_t packet_offset, size_t sz, enum bt_bfcr_status *status); | |
5cd6d0e5 PP |
329 | |
330 | /** | |
331 | * Continues the decoding process a given CTF class. | |
332 | * | |
333 | * The number of bits consumed by this function is returned. | |
334 | * | |
335 | * The \p status output parameter is where a status is placed, amongst | |
336 | * the following: | |
337 | * | |
338 | * - <b>#BT_BFCR_STATUS_OK</b>: decoding is done. | |
339 | * - <b>#BT_BFCR_STATUS_EOF</b>: the end of the buffer was reached, | |
340 | * but more data is needed to finish the decoding process of the | |
341 | * requested class. The user needs to call bt_bfcr_continue() | |
342 | * as long as #BT_BFCR_STATUS_EOF is returned to complete the | |
343 | * decoding process of the original class. | |
344 | * - <b>#BT_BFCR_STATUS_INVAL</b>: invalid argument. | |
345 | * - <b>#BT_BFCR_STATUS_ERROR</b>: general error. | |
346 | * | |
347 | * @param bfcr Binary class reader | |
348 | * @param buf Buffer | |
349 | * @param sz Size of buffer in bytes (from \p offset) | |
350 | * @param status Returned status (see description above) | |
351 | * @returns Number of consumed bits | |
352 | */ | |
4164020e SM |
353 | size_t bt_bfcr_continue(struct bt_bfcr *bfcr, const uint8_t *buf, size_t sz, |
354 | enum bt_bfcr_status *status); | |
5cd6d0e5 | 355 | |
4164020e | 356 | void bt_bfcr_set_unsigned_int_cb(struct bt_bfcr *bfcr, bt_bfcr_unsigned_int_cb_func cb); |
5cd6d0e5 | 357 | |
5cd6d0e5 | 358 | #endif /* CTF_BFCR_H */ |