Commit | Line | Data |
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e98a2d6e PP |
1 | /* |
2 | * Babeltrace - CTF binary type reader (BTR) | |
3 | * | |
4 | * Copyright (c) 2015-2016 EfficiOS Inc. and Linux Foundation | |
5 | * Copyright (c) 2015-2016 Philippe Proulx <pproulx@efficios.com> | |
6 | * | |
7 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
8 | * of this software and associated documentation files (the "Software"), to deal | |
9 | * in the Software without restriction, including without limitation the rights | |
10 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
11 | * copies of the Software, and to permit persons to whom the Software is | |
12 | * furnished to do so, subject to the following conditions: | |
13 | * | |
14 | * The above copyright notice and this permission notice shall be included in | |
15 | * all copies or substantial portions of the Software. | |
16 | * | |
17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
18 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
20 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
21 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
23 | * SOFTWARE. | |
24 | */ | |
25 | ||
dfef8367 | 26 | #define BT_LOG_TAG "PLUGIN-CTF-BTR" |
888d5a32 | 27 | #include "logging.h" |
dfef8367 | 28 | |
0fbb9a9f | 29 | #include <stdlib.h> |
e98a2d6e | 30 | #include <stdint.h> |
dfef8367 | 31 | #include <inttypes.h> |
e98a2d6e PP |
32 | #include <stdio.h> |
33 | #include <stddef.h> | |
34 | #include <stdbool.h> | |
35 | #include <assert.h> | |
36 | #include <string.h> | |
3d9990ac | 37 | #include <babeltrace/bitfield-internal.h> |
e98a2d6e | 38 | #include <babeltrace/ctf-ir/field-types.h> |
dfef8367 | 39 | #include <babeltrace/ctf-ir/field-types-internal.h> |
e98a2d6e | 40 | #include <babeltrace/ref.h> |
3d9990ac | 41 | #include <babeltrace/align-internal.h> |
e98a2d6e PP |
42 | #include <glib.h> |
43 | ||
06a626b8 | 44 | #include "btr.h" |
e98a2d6e | 45 | |
e98a2d6e PP |
46 | #define DIV8(_x) ((_x) >> 3) |
47 | #define BYTES_TO_BITS(_x) ((_x) * 8) | |
48 | #define BITS_TO_BYTES_FLOOR(_x) DIV8(_x) | |
49 | #define BITS_TO_BYTES_CEIL(_x) DIV8((_x) + 7) | |
50 | #define IN_BYTE_OFFSET(_at) ((_at) & 7) | |
51 | ||
52 | /* A visit stack entry */ | |
53 | struct stack_entry { | |
54 | /* | |
55 | * Current type of base field, one of: | |
56 | * | |
57 | * * Structure | |
58 | * * Array | |
59 | * * Sequence | |
60 | * * Variant | |
61 | * | |
62 | * Owned by this. | |
63 | */ | |
64 | struct bt_ctf_field_type *base_type; | |
65 | ||
66 | /* Length of base field (always 1 for variant types) */ | |
67 | int64_t base_len; | |
68 | ||
69 | /* Lndex of next field to read */ | |
70 | int64_t index; | |
71 | }; | |
72 | ||
73 | /* Visit stack */ | |
74 | struct stack { | |
75 | /* Entries (struct stack_entry *) (top is last element) */ | |
76 | GPtrArray *entries; | |
77 | }; | |
78 | ||
79 | /* Reading states */ | |
80 | enum btr_state { | |
81 | BTR_STATE_NEXT_FIELD, | |
82 | BTR_STATE_ALIGN_BASIC, | |
83 | BTR_STATE_ALIGN_COMPOUND, | |
84 | BTR_STATE_READ_BASIC_BEGIN, | |
85 | BTR_STATE_READ_BASIC_CONTINUE, | |
86 | BTR_STATE_DONE, | |
87 | }; | |
88 | ||
89 | /* Binary type reader */ | |
90 | struct bt_ctf_btr { | |
91 | /* Bisit stack */ | |
92 | struct stack *stack; | |
93 | ||
e98a2d6e PP |
94 | /* Current basic field type */ |
95 | struct bt_ctf_field_type *cur_basic_field_type; | |
96 | ||
97 | /* Current state */ | |
98 | enum btr_state state; | |
99 | ||
100 | /* | |
101 | * Last basic field type's byte order. | |
102 | * | |
103 | * This is used to detect errors since two contiguous basic | |
104 | * types for which the common boundary is not the boundary of | |
105 | * a byte cannot have different byte orders. | |
106 | * | |
107 | * This is set to BT_CTF_BYTE_ORDER_UNKNOWN on reset and when | |
108 | * the last basic field type was a string type. | |
109 | */ | |
110 | enum bt_ctf_byte_order last_bo; | |
111 | ||
112 | /* Current byte order (copied to last_bo after a successful read) */ | |
113 | enum bt_ctf_byte_order cur_bo; | |
114 | ||
115 | /* Stitch buffer infos */ | |
116 | struct { | |
117 | /* Stitch buffer */ | |
118 | uint8_t buf[16]; | |
119 | ||
120 | /* Offset, within stitch buffer, of first bit */ | |
121 | size_t offset; | |
122 | ||
123 | /* Length (bits) of data in stitch buffer from offset */ | |
124 | size_t at; | |
125 | } stitch; | |
126 | ||
127 | /* User buffer infos */ | |
128 | struct { | |
129 | /* Address */ | |
130 | const uint8_t *addr; | |
131 | ||
132 | /* Offset of data from address (bits) */ | |
133 | size_t offset; | |
134 | ||
135 | /* Current position from offset (bits) */ | |
136 | size_t at; | |
137 | ||
138 | /* Offset of offset within whole packet (bits) */ | |
139 | size_t packet_offset; | |
140 | ||
141 | /* Data size in buffer (bits) */ | |
142 | size_t sz; | |
143 | ||
144 | /* Buffer size (bytes) */ | |
145 | size_t buf_sz; | |
146 | } buf; | |
147 | ||
148 | /* User stuff */ | |
149 | struct { | |
150 | /* Callback functions */ | |
151 | struct bt_ctf_btr_cbs cbs; | |
152 | ||
153 | /* Private data */ | |
154 | void *data; | |
155 | } user; | |
156 | }; | |
157 | ||
dfef8367 PP |
158 | static inline |
159 | const char *btr_state_string(enum btr_state state) | |
160 | { | |
161 | switch (state) { | |
162 | case BTR_STATE_NEXT_FIELD: | |
163 | return "BTR_STATE_NEXT_FIELD"; | |
164 | case BTR_STATE_ALIGN_BASIC: | |
165 | return "BTR_STATE_ALIGN_BASIC"; | |
166 | case BTR_STATE_ALIGN_COMPOUND: | |
167 | return "BTR_STATE_ALIGN_COMPOUND"; | |
168 | case BTR_STATE_READ_BASIC_BEGIN: | |
169 | return "BTR_STATE_READ_BASIC_BEGIN"; | |
170 | case BTR_STATE_READ_BASIC_CONTINUE: | |
171 | return "BTR_STATE_READ_BASIC_CONTINUE"; | |
172 | case BTR_STATE_DONE: | |
173 | return "BTR_STATE_DONE"; | |
174 | default: | |
175 | return "(unknown)"; | |
176 | } | |
177 | } | |
178 | ||
e98a2d6e PP |
179 | static |
180 | void stack_entry_free_func(gpointer data) | |
181 | { | |
182 | struct stack_entry *entry = data; | |
183 | ||
184 | BT_PUT(entry->base_type); | |
185 | g_free(entry); | |
186 | } | |
187 | ||
188 | static | |
189 | struct stack *stack_new(void) | |
190 | { | |
191 | struct stack *stack = NULL; | |
192 | ||
193 | stack = g_new0(struct stack, 1); | |
194 | if (!stack) { | |
dfef8367 | 195 | BT_LOGE_STR("Failed to allocate one stack."); |
e98a2d6e PP |
196 | goto error; |
197 | } | |
198 | ||
199 | stack->entries = g_ptr_array_new_with_free_func(stack_entry_free_func); | |
200 | if (!stack->entries) { | |
dfef8367 | 201 | BT_LOGE_STR("Failed to allocate a GPtrArray."); |
e98a2d6e PP |
202 | goto error; |
203 | } | |
204 | ||
dfef8367 | 205 | BT_LOGD("Created stack: addr=%p", stack); |
e98a2d6e PP |
206 | return stack; |
207 | ||
208 | error: | |
209 | g_free(stack); | |
210 | ||
211 | return NULL; | |
212 | } | |
213 | ||
214 | static | |
215 | void stack_destroy(struct stack *stack) | |
216 | { | |
217 | if (!stack) { | |
218 | return; | |
219 | } | |
220 | ||
dfef8367 | 221 | BT_LOGD("Destroying stack: addr=%p", stack); |
e98a2d6e PP |
222 | g_ptr_array_free(stack->entries, TRUE); |
223 | g_free(stack); | |
224 | } | |
225 | ||
226 | static inline | |
227 | int64_t get_compound_field_type_length(struct bt_ctf_btr *btr, | |
dfef8367 | 228 | struct bt_ctf_field_type *field_type) |
e98a2d6e PP |
229 | { |
230 | int64_t length; | |
231 | ||
232 | switch (bt_ctf_field_type_get_type_id(field_type)) { | |
1487a16a | 233 | case BT_CTF_FIELD_TYPE_ID_STRUCT: |
e98a2d6e PP |
234 | length = (int64_t) bt_ctf_field_type_structure_get_field_count( |
235 | field_type); | |
236 | break; | |
1487a16a | 237 | case BT_CTF_FIELD_TYPE_ID_VARIANT: |
e98a2d6e PP |
238 | /* Variant field types always "contain" a single type */ |
239 | length = 1; | |
240 | break; | |
1487a16a | 241 | case BT_CTF_FIELD_TYPE_ID_ARRAY: |
e98a2d6e PP |
242 | length = bt_ctf_field_type_array_get_length(field_type); |
243 | break; | |
1487a16a | 244 | case BT_CTF_FIELD_TYPE_ID_SEQUENCE: |
e98a2d6e PP |
245 | length = btr->user.cbs.query.get_sequence_length(field_type, |
246 | btr->user.data); | |
247 | break; | |
248 | default: | |
dfef8367 PP |
249 | BT_LOGW("Cannot get field type's field count: btr-addr=%p, " |
250 | "ft-addr=%p, ft-id=%s", | |
251 | btr, field_type, | |
252 | bt_ctf_field_type_id_string( | |
253 | bt_ctf_field_type_get_type_id(field_type))); | |
e98a2d6e PP |
254 | length = BT_CTF_BTR_STATUS_ERROR; |
255 | } | |
256 | ||
257 | return length; | |
258 | } | |
259 | ||
260 | static | |
261 | int stack_push(struct stack *stack, struct bt_ctf_field_type *base_type, | |
262 | size_t base_len) | |
263 | { | |
264 | int ret = 0; | |
265 | struct stack_entry *entry; | |
266 | ||
267 | assert(stack); | |
268 | assert(base_type); | |
269 | ||
dfef8367 PP |
270 | BT_LOGV("Pushing field type on stack: stack-addr=%p, " |
271 | "ft-addr=%p, ft-id=%s, base-length=%zu, " | |
272 | "stack-size-before=%u, stack-size-after=%u", | |
273 | stack, base_type, bt_ctf_field_type_id_string( | |
274 | bt_ctf_field_type_get_type_id(base_type)), | |
275 | base_len, stack->entries->len, stack->entries->len + 1); | |
e98a2d6e PP |
276 | entry = g_new0(struct stack_entry, 1); |
277 | if (!entry) { | |
dfef8367 PP |
278 | BT_LOGE("Failed to allocate one stack entry: stack-addr=%p", |
279 | stack); | |
e98a2d6e PP |
280 | ret = BT_CTF_BTR_STATUS_ERROR; |
281 | goto end; | |
282 | } | |
283 | ||
284 | entry->base_type = base_type; | |
285 | bt_get(entry->base_type); | |
286 | entry->base_len = base_len; | |
287 | g_ptr_array_add(stack->entries, entry); | |
288 | ||
289 | end: | |
290 | return ret; | |
291 | } | |
292 | ||
293 | static | |
294 | int stack_push_with_len(struct bt_ctf_btr *btr, | |
dfef8367 | 295 | struct bt_ctf_field_type *base_type) |
e98a2d6e PP |
296 | { |
297 | int ret = 0; | |
298 | int64_t base_len = get_compound_field_type_length(btr, base_type); | |
299 | ||
300 | if (base_len < 0) { | |
dfef8367 PP |
301 | BT_LOGW("Cannot get compound field type's field count: " |
302 | "btr-addr=%p, ft-addr=%p, ft-id=%s", | |
303 | btr, base_type, bt_ctf_field_type_id_string( | |
304 | bt_ctf_field_type_get_type_id(base_type))); | |
e98a2d6e PP |
305 | ret = BT_CTF_BTR_STATUS_ERROR; |
306 | goto end; | |
307 | } | |
308 | ||
309 | ret = stack_push(btr->stack, base_type, (size_t) base_len); | |
310 | ||
311 | end: | |
312 | return ret; | |
313 | } | |
314 | ||
315 | static inline | |
316 | unsigned int stack_size(struct stack *stack) | |
317 | { | |
318 | assert(stack); | |
319 | ||
320 | return stack->entries->len; | |
321 | } | |
322 | ||
323 | static | |
324 | void stack_pop(struct stack *stack) | |
325 | { | |
326 | assert(stack); | |
327 | assert(stack_size(stack)); | |
dfef8367 PP |
328 | BT_LOGV("Popping from stack: " |
329 | "stack-addr=%p, stack-size-before=%u, stack-size-after=%u", | |
330 | stack, stack->entries->len, stack->entries->len - 1); | |
e98a2d6e PP |
331 | g_ptr_array_remove_index(stack->entries, stack->entries->len - 1); |
332 | } | |
333 | ||
334 | static inline | |
335 | bool stack_empty(struct stack *stack) | |
336 | { | |
337 | return stack_size(stack) == 0; | |
338 | } | |
339 | ||
340 | static | |
341 | void stack_clear(struct stack *stack) | |
342 | { | |
343 | assert(stack); | |
344 | ||
345 | if (!stack_empty(stack)) { | |
346 | g_ptr_array_remove_range(stack->entries, 0, stack_size(stack)); | |
347 | } | |
348 | ||
349 | assert(stack_empty(stack)); | |
350 | } | |
351 | ||
352 | static inline | |
353 | struct stack_entry *stack_top(struct stack *stack) | |
354 | { | |
355 | assert(stack); | |
356 | assert(stack_size(stack)); | |
357 | ||
358 | return g_ptr_array_index(stack->entries, stack->entries->len - 1); | |
359 | } | |
360 | ||
361 | static inline | |
362 | size_t available_bits(struct bt_ctf_btr *btr) | |
363 | { | |
364 | return btr->buf.sz - btr->buf.at; | |
365 | } | |
366 | ||
367 | static inline | |
368 | void consume_bits(struct bt_ctf_btr *btr, size_t incr) | |
369 | { | |
dfef8367 PP |
370 | BT_LOGV("Advancing cursor: btr-addr=%p, cur-before=%zu, cur-after=%zu", |
371 | btr, btr->buf.at, btr->buf.at + incr); | |
e98a2d6e PP |
372 | btr->buf.at += incr; |
373 | } | |
374 | ||
375 | static inline | |
376 | bool has_enough_bits(struct bt_ctf_btr *btr, size_t sz) | |
377 | { | |
378 | return available_bits(btr) >= sz; | |
379 | } | |
380 | ||
381 | static inline | |
382 | bool at_least_one_bit_left(struct bt_ctf_btr *btr) | |
383 | { | |
384 | return has_enough_bits(btr, 1); | |
385 | } | |
386 | ||
387 | static inline | |
388 | size_t packet_at(struct bt_ctf_btr *btr) | |
389 | { | |
390 | return btr->buf.packet_offset + btr->buf.at; | |
391 | } | |
392 | ||
393 | static inline | |
394 | size_t buf_at_from_addr(struct bt_ctf_btr *btr) | |
395 | { | |
396 | /* | |
397 | * Considering this: | |
398 | * | |
399 | * ====== offset ===== (17) | |
400 | * | |
401 | * xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx | |
402 | * ^ | |
403 | * addr (0) ==== at ==== (12) | |
404 | * | |
405 | * We want this: | |
406 | * | |
407 | * =============================== (29) | |
408 | */ | |
409 | return btr->buf.offset + btr->buf.at; | |
410 | } | |
411 | ||
412 | static inline | |
413 | int get_basic_field_type_size(struct bt_ctf_btr *btr, | |
dfef8367 | 414 | struct bt_ctf_field_type *field_type) |
e98a2d6e PP |
415 | { |
416 | int size; | |
417 | ||
418 | switch (bt_ctf_field_type_get_type_id(field_type)) { | |
1487a16a | 419 | case BT_CTF_FIELD_TYPE_ID_INTEGER: |
e98a2d6e PP |
420 | size = bt_ctf_field_type_integer_get_size(field_type); |
421 | break; | |
1487a16a | 422 | case BT_CTF_FIELD_TYPE_ID_FLOAT: |
e98a2d6e PP |
423 | { |
424 | int exp_dig, mant_dig; | |
425 | ||
426 | exp_dig = | |
427 | bt_ctf_field_type_floating_point_get_exponent_digits( | |
428 | field_type); | |
429 | mant_dig = | |
430 | bt_ctf_field_type_floating_point_get_mantissa_digits( | |
431 | field_type); | |
dfef8367 PP |
432 | assert(exp_dig >= 0); |
433 | assert(mant_dig >= 0); | |
e98a2d6e PP |
434 | size = exp_dig + mant_dig; |
435 | break; | |
436 | } | |
1487a16a | 437 | case BT_CTF_FIELD_TYPE_ID_ENUM: |
e98a2d6e PP |
438 | { |
439 | struct bt_ctf_field_type *int_type; | |
440 | ||
441 | int_type = bt_ctf_field_type_enumeration_get_container_type( | |
442 | field_type); | |
dfef8367 | 443 | assert(int_type); |
e98a2d6e PP |
444 | size = get_basic_field_type_size(btr, int_type); |
445 | BT_PUT(int_type); | |
446 | break; | |
447 | } | |
448 | default: | |
449 | size = BT_CTF_BTR_STATUS_ERROR; | |
450 | break; | |
451 | } | |
452 | ||
e98a2d6e PP |
453 | return size; |
454 | } | |
455 | ||
456 | static | |
457 | void stitch_reset(struct bt_ctf_btr *btr) | |
458 | { | |
459 | btr->stitch.offset = 0; | |
460 | btr->stitch.at = 0; | |
461 | } | |
462 | ||
463 | static inline | |
464 | size_t stitch_at_from_addr(struct bt_ctf_btr *btr) | |
465 | { | |
466 | return btr->stitch.offset + btr->stitch.at; | |
467 | } | |
468 | ||
469 | static | |
470 | void stitch_append_from_buf(struct bt_ctf_btr *btr, size_t sz) | |
471 | { | |
472 | size_t stitch_byte_at; | |
473 | size_t buf_byte_at; | |
474 | size_t nb_bytes;; | |
475 | ||
476 | if (sz == 0) { | |
477 | return; | |
478 | } | |
479 | ||
480 | stitch_byte_at = | |
481 | BITS_TO_BYTES_FLOOR(stitch_at_from_addr(btr)); | |
482 | buf_byte_at = BITS_TO_BYTES_FLOOR(buf_at_from_addr(btr)); | |
483 | nb_bytes = BITS_TO_BYTES_CEIL(sz); | |
484 | assert(nb_bytes > 0); | |
485 | memcpy(&btr->stitch.buf[stitch_byte_at], &btr->buf.addr[buf_byte_at], | |
486 | nb_bytes); | |
487 | btr->stitch.at += sz; | |
488 | consume_bits(btr, sz); | |
489 | } | |
490 | ||
491 | static | |
492 | void stitch_append_from_remaining_buf(struct bt_ctf_btr *btr) | |
493 | { | |
494 | stitch_append_from_buf(btr, available_bits(btr)); | |
495 | } | |
496 | ||
497 | static | |
498 | void stitch_set_from_remaining_buf(struct bt_ctf_btr *btr) | |
499 | { | |
500 | stitch_reset(btr); | |
501 | btr->stitch.offset = IN_BYTE_OFFSET(buf_at_from_addr(btr)); | |
502 | stitch_append_from_remaining_buf(btr); | |
503 | } | |
504 | ||
505 | static inline | |
506 | enum bt_ctf_btr_status read_unsigned_bitfield(const uint8_t *buf, size_t at, | |
dfef8367 | 507 | int64_t field_size, enum bt_ctf_byte_order bo, uint64_t *v) |
e98a2d6e PP |
508 | { |
509 | enum bt_ctf_btr_status status = BT_CTF_BTR_STATUS_OK; | |
510 | ||
511 | switch (bo) { | |
512 | case BT_CTF_BYTE_ORDER_BIG_ENDIAN: | |
513 | case BT_CTF_BYTE_ORDER_NETWORK: | |
514 | bt_bitfield_read_be(buf, uint8_t, at, field_size, v); | |
515 | break; | |
516 | case BT_CTF_BYTE_ORDER_LITTLE_ENDIAN: | |
517 | bt_bitfield_read_le(buf, uint8_t, at, field_size, v); | |
518 | break; | |
519 | default: | |
dfef8367 PP |
520 | BT_LOGF("Cannot read unsigned bit array: unknown byte order: bo=%d", bo); |
521 | abort(); | |
e98a2d6e PP |
522 | } |
523 | ||
dfef8367 PP |
524 | BT_LOGV("Read unsigned bit array: cur=%zu, size=%" PRId64 ", " |
525 | "bo=%s, val=%" PRIu64, at, field_size, | |
526 | bt_ctf_byte_order_string(bo), *v); | |
e98a2d6e PP |
527 | return status; |
528 | } | |
529 | ||
530 | static inline | |
531 | enum bt_ctf_btr_status read_signed_bitfield(const uint8_t *buf, size_t at, | |
dfef8367 | 532 | int64_t field_size, enum bt_ctf_byte_order bo, int64_t *v) |
e98a2d6e PP |
533 | { |
534 | enum bt_ctf_btr_status status = BT_CTF_BTR_STATUS_OK; | |
535 | ||
536 | switch (bo) { | |
537 | case BT_CTF_BYTE_ORDER_BIG_ENDIAN: | |
538 | case BT_CTF_BYTE_ORDER_NETWORK: | |
539 | bt_bitfield_read_be(buf, uint8_t, at, field_size, v); | |
540 | break; | |
541 | case BT_CTF_BYTE_ORDER_LITTLE_ENDIAN: | |
542 | bt_bitfield_read_le(buf, uint8_t, at, field_size, v); | |
543 | break; | |
544 | default: | |
dfef8367 PP |
545 | BT_LOGF("Cannot read signed bit array: unknown byte order: bo=%d", bo); |
546 | abort(); | |
e98a2d6e PP |
547 | } |
548 | ||
dfef8367 PP |
549 | BT_LOGV("Read signed bit array: cur=%zu, size=%" PRId64 ", " |
550 | "bo=%s, val=%" PRId64, at, field_size, | |
551 | bt_ctf_byte_order_string(bo), *v); | |
e98a2d6e PP |
552 | return status; |
553 | } | |
554 | ||
555 | typedef enum bt_ctf_btr_status (* read_basic_and_call_cb_t)(struct bt_ctf_btr *, | |
dfef8367 | 556 | const uint8_t *, size_t); |
e98a2d6e PP |
557 | |
558 | static inline | |
559 | enum bt_ctf_btr_status validate_contiguous_bo(struct bt_ctf_btr *btr, | |
dfef8367 | 560 | enum bt_ctf_byte_order next_bo) |
e98a2d6e PP |
561 | { |
562 | enum bt_ctf_btr_status status = BT_CTF_BTR_STATUS_OK; | |
563 | ||
564 | /* Always valid when at a byte boundary */ | |
565 | if (packet_at(btr) % 8 == 0) { | |
566 | goto end; | |
567 | } | |
568 | ||
569 | /* Always valid if last byte order is unknown */ | |
570 | if (btr->last_bo == BT_CTF_BYTE_ORDER_UNKNOWN) { | |
571 | goto end; | |
572 | } | |
573 | ||
574 | /* Always valid if next byte order is unknown */ | |
575 | if (next_bo == BT_CTF_BYTE_ORDER_UNKNOWN) { | |
576 | goto end; | |
577 | } | |
578 | ||
579 | /* Make sure last byte order is compatible with the next byte order */ | |
580 | switch (btr->last_bo) { | |
581 | case BT_CTF_BYTE_ORDER_BIG_ENDIAN: | |
582 | case BT_CTF_BYTE_ORDER_NETWORK: | |
583 | if (next_bo != BT_CTF_BYTE_ORDER_BIG_ENDIAN && | |
584 | next_bo != BT_CTF_BYTE_ORDER_NETWORK) { | |
585 | status = BT_CTF_BTR_STATUS_ERROR; | |
586 | } | |
587 | break; | |
588 | case BT_CTF_BYTE_ORDER_LITTLE_ENDIAN: | |
589 | if (next_bo != BT_CTF_BYTE_ORDER_LITTLE_ENDIAN) { | |
590 | status = BT_CTF_BTR_STATUS_ERROR; | |
591 | } | |
592 | break; | |
593 | default: | |
594 | status = BT_CTF_BTR_STATUS_ERROR; | |
595 | } | |
596 | ||
597 | end: | |
fdf0e7a0 | 598 | if (status < 0) { |
dfef8367 PP |
599 | BT_LOGW("Cannot read bit array: two different byte orders not at a byte boundary: " |
600 | "btr-addr=%p, last-bo=%s, next-bo=%s", | |
601 | btr, bt_ctf_byte_order_string(btr->last_bo), | |
602 | bt_ctf_byte_order_string(next_bo)); | |
603 | } | |
604 | ||
e98a2d6e PP |
605 | return status; |
606 | } | |
607 | ||
608 | static | |
609 | enum bt_ctf_btr_status read_basic_float_and_call_cb(struct bt_ctf_btr *btr, | |
dfef8367 | 610 | const uint8_t *buf, size_t at) |
e98a2d6e PP |
611 | { |
612 | int ret; | |
613 | double dblval; | |
614 | int64_t field_size; | |
615 | enum bt_ctf_byte_order bo; | |
616 | enum bt_ctf_btr_status status = BT_CTF_BTR_STATUS_OK; | |
617 | ||
618 | field_size = get_basic_field_type_size(btr, btr->cur_basic_field_type); | |
619 | bo = bt_ctf_field_type_get_byte_order(btr->cur_basic_field_type); | |
620 | btr->cur_bo = bo; | |
621 | ||
622 | switch (field_size) { | |
623 | case 32: | |
624 | { | |
625 | uint64_t v; | |
626 | union { | |
627 | uint32_t u; | |
628 | float f; | |
629 | } f32; | |
630 | ||
631 | ret = bt_ctf_field_type_floating_point_get_mantissa_digits( | |
632 | btr->cur_basic_field_type); | |
633 | assert(ret == 24); | |
634 | ret = bt_ctf_field_type_floating_point_get_exponent_digits( | |
635 | btr->cur_basic_field_type); | |
636 | assert(ret == 8); | |
637 | status = read_unsigned_bitfield(buf, at, field_size, bo, &v); | |
638 | if (status != BT_CTF_BTR_STATUS_OK) { | |
dfef8367 PP |
639 | BT_LOGW("Cannot read unsigned 32-bit bit array for floating point number field: " |
640 | "btr-addr=%p, status=%s", | |
641 | btr, bt_ctf_btr_status_string(status)); | |
e98a2d6e PP |
642 | goto end; |
643 | } | |
644 | ||
645 | f32.u = (uint32_t) v; | |
646 | dblval = (double) f32.f; | |
647 | break; | |
648 | } | |
649 | case 64: | |
650 | { | |
651 | union { | |
652 | uint64_t u; | |
653 | double d; | |
654 | } f64; | |
655 | ||
656 | ret = bt_ctf_field_type_floating_point_get_mantissa_digits( | |
657 | btr->cur_basic_field_type); | |
658 | assert(ret == 53); | |
659 | ret = bt_ctf_field_type_floating_point_get_exponent_digits( | |
660 | btr->cur_basic_field_type); | |
661 | assert(ret == 11); | |
662 | status = read_unsigned_bitfield(buf, at, field_size, bo, | |
663 | &f64.u); | |
664 | if (status != BT_CTF_BTR_STATUS_OK) { | |
dfef8367 PP |
665 | BT_LOGW("Cannot read unsigned 64-bit bit array for floating point number field: " |
666 | "btr-addr=%p, status=%s", | |
667 | btr, bt_ctf_btr_status_string(status)); | |
e98a2d6e PP |
668 | goto end; |
669 | } | |
670 | ||
671 | dblval = f64.d; | |
672 | break; | |
673 | } | |
674 | default: | |
675 | /* Only 32-bit and 64-bit fields are supported currently */ | |
dfef8367 PP |
676 | BT_LOGW("Only 32-bit and 64-bit floating point number fields are supported: " |
677 | "btr-addr=%p", btr); | |
e98a2d6e PP |
678 | status = BT_CTF_BTR_STATUS_ERROR; |
679 | goto end; | |
680 | } | |
681 | ||
dfef8367 PP |
682 | BT_LOGV("Read floating point number value: btr=%p, cur=%zu, val=%f", |
683 | btr, at, dblval); | |
684 | ||
e98a2d6e | 685 | if (btr->user.cbs.types.floating_point) { |
dfef8367 | 686 | BT_LOGV("Calling user function (floating point number)."); |
e98a2d6e PP |
687 | status = btr->user.cbs.types.floating_point(dblval, |
688 | btr->cur_basic_field_type, btr->user.data); | |
dfef8367 PP |
689 | BT_LOGV("User function returned: status=%s", |
690 | bt_ctf_btr_status_string(status)); | |
691 | if (status != BT_CTF_BTR_STATUS_OK) { | |
692 | BT_LOGW("User function failed: btr-addr=%p, status=%s", | |
693 | btr, bt_ctf_btr_status_string(status)); | |
694 | } | |
e98a2d6e PP |
695 | } |
696 | ||
697 | end: | |
698 | return status; | |
699 | } | |
700 | ||
701 | static inline | |
702 | enum bt_ctf_btr_status read_basic_int_and_call(struct bt_ctf_btr *btr, | |
dfef8367 PP |
703 | const uint8_t *buf, size_t at, |
704 | struct bt_ctf_field_type *int_type, | |
705 | struct bt_ctf_field_type *orig_type) | |
e98a2d6e PP |
706 | { |
707 | int signd; | |
708 | int64_t field_size; | |
709 | enum bt_ctf_byte_order bo; | |
710 | enum bt_ctf_btr_status status = BT_CTF_BTR_STATUS_OK; | |
711 | ||
712 | signd = bt_ctf_field_type_integer_get_signed(int_type); | |
713 | field_size = get_basic_field_type_size(btr, int_type); | |
714 | if (field_size < 1) { | |
dfef8367 PP |
715 | BT_LOGW("Cannot get integer field type's size: " |
716 | "btr=%p, at=%zu, ft-addr=%p", | |
717 | btr, at, int_type); | |
e98a2d6e PP |
718 | status = BT_CTF_BTR_STATUS_ERROR; |
719 | goto end; | |
720 | } | |
721 | ||
722 | bo = bt_ctf_field_type_get_byte_order(int_type); | |
723 | ||
724 | /* | |
725 | * Update current byte order now because we could be reading | |
726 | * the integer value of an enumeration type, and thus we know | |
727 | * here the actual supporting integer type's byte order. | |
728 | */ | |
729 | btr->cur_bo = bo; | |
730 | ||
731 | if (signd) { | |
732 | int64_t v; | |
733 | ||
734 | status = read_signed_bitfield(buf, at, field_size, bo, &v); | |
735 | if (status != BT_CTF_BTR_STATUS_OK) { | |
dfef8367 PP |
736 | BT_LOGW("Cannot read signed bit array for signed integer field: " |
737 | "btr-addr=%p, status=%s", | |
738 | btr, bt_ctf_btr_status_string(status)); | |
e98a2d6e PP |
739 | goto end; |
740 | } | |
741 | ||
742 | if (btr->user.cbs.types.signed_int) { | |
dfef8367 | 743 | BT_LOGV("Calling user function (signed integer)."); |
e98a2d6e PP |
744 | status = btr->user.cbs.types.signed_int(v, |
745 | btr->cur_basic_field_type, btr->user.data); | |
dfef8367 PP |
746 | BT_LOGV("User function returned: status=%s", |
747 | bt_ctf_btr_status_string(status)); | |
748 | if (status != BT_CTF_BTR_STATUS_OK) { | |
749 | BT_LOGW("User function failed: " | |
750 | "btr-addr=%p, status=%s", | |
751 | btr, bt_ctf_btr_status_string(status)); | |
752 | } | |
e98a2d6e PP |
753 | } |
754 | } else { | |
755 | uint64_t v; | |
756 | ||
757 | status = read_unsigned_bitfield(buf, at, field_size, bo, &v); | |
758 | if (status != BT_CTF_BTR_STATUS_OK) { | |
dfef8367 PP |
759 | BT_LOGW("Cannot read unsigned bit array for unsigned integer field: " |
760 | "btr-addr=%p, status=%s", | |
761 | btr, bt_ctf_btr_status_string(status)); | |
e98a2d6e PP |
762 | goto end; |
763 | } | |
764 | ||
765 | if (btr->user.cbs.types.unsigned_int) { | |
dfef8367 | 766 | BT_LOGV("Calling user function (unsigned integer)."); |
e98a2d6e PP |
767 | status = btr->user.cbs.types.unsigned_int(v, |
768 | btr->cur_basic_field_type, btr->user.data); | |
dfef8367 PP |
769 | BT_LOGV("User function returned: status=%s", |
770 | bt_ctf_btr_status_string(status)); | |
771 | if (status != BT_CTF_BTR_STATUS_OK) { | |
772 | BT_LOGW("User function failed: " | |
773 | "btr-addr=%p, status=%s", | |
774 | btr, bt_ctf_btr_status_string(status)); | |
775 | } | |
e98a2d6e PP |
776 | } |
777 | } | |
778 | ||
779 | end: | |
780 | return status; | |
781 | } | |
782 | ||
783 | static | |
784 | enum bt_ctf_btr_status read_basic_int_and_call_cb(struct bt_ctf_btr *btr, | |
dfef8367 | 785 | const uint8_t *buf, size_t at) |
e98a2d6e PP |
786 | { |
787 | return read_basic_int_and_call(btr, buf, at, btr->cur_basic_field_type, | |
788 | btr->cur_basic_field_type); | |
789 | } | |
790 | ||
791 | static | |
792 | enum bt_ctf_btr_status read_basic_enum_and_call_cb(struct bt_ctf_btr *btr, | |
dfef8367 | 793 | const uint8_t *buf, size_t at) |
e98a2d6e PP |
794 | { |
795 | struct bt_ctf_field_type *int_field_type; | |
796 | enum bt_ctf_btr_status status = BT_CTF_BTR_STATUS_OK; | |
797 | ||
798 | int_field_type = bt_ctf_field_type_enumeration_get_container_type( | |
799 | btr->cur_basic_field_type); | |
dfef8367 | 800 | assert(int_field_type); |
e98a2d6e PP |
801 | status = read_basic_int_and_call(btr, buf, at, |
802 | int_field_type, btr->cur_basic_field_type); | |
dfef8367 | 803 | bt_put(int_field_type); |
e98a2d6e PP |
804 | return status; |
805 | } | |
806 | ||
807 | static inline | |
808 | enum bt_ctf_btr_status read_basic_type_and_call_continue(struct bt_ctf_btr *btr, | |
dfef8367 | 809 | read_basic_and_call_cb_t read_basic_and_call_cb) |
e98a2d6e PP |
810 | { |
811 | size_t available; | |
812 | int64_t field_size; | |
813 | int64_t needed_bits; | |
814 | enum bt_ctf_btr_status status = BT_CTF_BTR_STATUS_OK; | |
815 | ||
816 | if (!at_least_one_bit_left(btr)) { | |
dfef8367 | 817 | BT_LOGV("Reached end of data: btr-addr=%p", btr); |
e98a2d6e PP |
818 | status = BT_CTF_BTR_STATUS_EOF; |
819 | goto end; | |
820 | } | |
821 | ||
822 | field_size = get_basic_field_type_size(btr, btr->cur_basic_field_type); | |
823 | if (field_size < 1) { | |
dfef8367 PP |
824 | BT_LOGW("Cannot get basic field type's size: " |
825 | "btr-addr=%p, ft-addr=%p", | |
826 | btr, btr->cur_basic_field_type); | |
e98a2d6e PP |
827 | status = BT_CTF_BTR_STATUS_ERROR; |
828 | goto end; | |
829 | } | |
830 | ||
831 | available = available_bits(btr); | |
832 | needed_bits = field_size - btr->stitch.at; | |
dfef8367 PP |
833 | BT_LOGV("Continuing basic field decoding: " |
834 | "btr-addr=%p, field-size=%" PRId64 ", needed-size=%" PRId64 ", " | |
835 | "available-size=%zu", | |
836 | btr, field_size, needed_bits, available); | |
e98a2d6e PP |
837 | if (needed_bits <= available) { |
838 | /* We have all the bits; append to stitch, then decode */ | |
839 | stitch_append_from_buf(btr, needed_bits); | |
840 | status = read_basic_and_call_cb(btr, btr->stitch.buf, | |
841 | btr->stitch.offset); | |
842 | if (status != BT_CTF_BTR_STATUS_OK) { | |
dfef8367 PP |
843 | BT_LOGW("Cannot read basic field: " |
844 | "btr-addr=%p, ft-addr=%p, status=%s", | |
845 | btr, btr->cur_basic_field_type, | |
846 | bt_ctf_btr_status_string(status)); | |
e98a2d6e PP |
847 | goto end; |
848 | } | |
849 | ||
850 | if (stack_empty(btr->stack)) { | |
851 | /* Root is a basic type */ | |
852 | btr->state = BTR_STATE_DONE; | |
853 | } else { | |
854 | /* Go to next field */ | |
855 | stack_top(btr->stack)->index++; | |
856 | btr->state = BTR_STATE_NEXT_FIELD; | |
857 | btr->last_bo = btr->cur_bo; | |
858 | } | |
859 | goto end; | |
860 | } | |
861 | ||
862 | /* We are here; it means we don't have enough data to decode this */ | |
dfef8367 | 863 | BT_LOGV_STR("Not enough data to read the next basic field: appending to stitch buffer."); |
e98a2d6e PP |
864 | stitch_append_from_remaining_buf(btr); |
865 | status = BT_CTF_BTR_STATUS_EOF; | |
866 | ||
867 | end: | |
868 | return status; | |
869 | } | |
870 | ||
871 | static inline | |
872 | enum bt_ctf_btr_status read_basic_type_and_call_begin(struct bt_ctf_btr *btr, | |
dfef8367 | 873 | read_basic_and_call_cb_t read_basic_and_call_cb) |
e98a2d6e PP |
874 | { |
875 | size_t available; | |
876 | int64_t field_size; | |
877 | enum bt_ctf_byte_order bo; | |
878 | enum bt_ctf_btr_status status = BT_CTF_BTR_STATUS_OK; | |
879 | ||
880 | if (!at_least_one_bit_left(btr)) { | |
dfef8367 | 881 | BT_LOGV("Reached end of data: btr-addr=%p", btr); |
e98a2d6e PP |
882 | status = BT_CTF_BTR_STATUS_EOF; |
883 | goto end; | |
884 | } | |
885 | ||
886 | field_size = get_basic_field_type_size(btr, btr->cur_basic_field_type); | |
e98a2d6e | 887 | if (field_size < 1) { |
dfef8367 PP |
888 | BT_LOGW("Cannot get basic field type's size: " |
889 | "btr-addr=%p, ft-addr=%p", | |
890 | btr, btr->cur_basic_field_type); | |
e98a2d6e PP |
891 | status = BT_CTF_BTR_STATUS_ERROR; |
892 | goto end; | |
893 | } | |
894 | ||
895 | bo = bt_ctf_field_type_get_byte_order(btr->cur_basic_field_type); | |
896 | status = validate_contiguous_bo(btr, bo); | |
e98a2d6e | 897 | if (status != BT_CTF_BTR_STATUS_OK) { |
dfef8367 | 898 | /* validate_contiguous_bo() logs errors */ |
e98a2d6e PP |
899 | goto end; |
900 | } | |
901 | ||
902 | available = available_bits(btr); | |
903 | ||
904 | if (field_size <= available) { | |
905 | /* We have all the bits; decode and set now */ | |
906 | status = read_basic_and_call_cb(btr, btr->buf.addr, | |
907 | buf_at_from_addr(btr)); | |
e98a2d6e | 908 | if (status != BT_CTF_BTR_STATUS_OK) { |
dfef8367 PP |
909 | BT_LOGW("Cannot read basic field: " |
910 | "btr-addr=%p, ft-addr=%p, status=%s", | |
911 | btr, btr->cur_basic_field_type, | |
912 | bt_ctf_btr_status_string(status)); | |
e98a2d6e PP |
913 | goto end; |
914 | } | |
915 | ||
916 | consume_bits(btr, field_size); | |
917 | ||
918 | if (stack_empty(btr->stack)) { | |
919 | /* Root is a basic type */ | |
920 | btr->state = BTR_STATE_DONE; | |
921 | } else { | |
922 | /* Go to next field */ | |
923 | stack_top(btr->stack)->index++; | |
924 | btr->state = BTR_STATE_NEXT_FIELD; | |
925 | btr->last_bo = btr->cur_bo; | |
926 | } | |
927 | ||
928 | goto end; | |
929 | } | |
930 | ||
931 | /* We are here; it means we don't have enough data to decode this */ | |
dfef8367 | 932 | BT_LOGV_STR("Not enough data to read the next basic field: setting stitch buffer."); |
e98a2d6e PP |
933 | stitch_set_from_remaining_buf(btr); |
934 | btr->state = BTR_STATE_READ_BASIC_CONTINUE; | |
935 | status = BT_CTF_BTR_STATUS_EOF; | |
936 | ||
937 | end: | |
938 | return status; | |
939 | } | |
940 | ||
941 | static inline | |
942 | enum bt_ctf_btr_status read_basic_int_type_and_call_begin( | |
dfef8367 | 943 | struct bt_ctf_btr *btr) |
e98a2d6e PP |
944 | { |
945 | return read_basic_type_and_call_begin(btr, read_basic_int_and_call_cb); | |
946 | } | |
947 | ||
948 | static inline | |
949 | enum bt_ctf_btr_status read_basic_int_type_and_call_continue( | |
dfef8367 | 950 | struct bt_ctf_btr *btr) |
e98a2d6e PP |
951 | { |
952 | return read_basic_type_and_call_continue(btr, | |
953 | read_basic_int_and_call_cb); | |
954 | } | |
955 | ||
956 | static inline | |
957 | enum bt_ctf_btr_status read_basic_float_type_and_call_begin( | |
dfef8367 | 958 | struct bt_ctf_btr *btr) |
e98a2d6e PP |
959 | { |
960 | return read_basic_type_and_call_begin(btr, | |
961 | read_basic_float_and_call_cb); | |
962 | } | |
963 | ||
964 | static inline | |
965 | enum bt_ctf_btr_status read_basic_float_type_and_call_continue( | |
dfef8367 | 966 | struct bt_ctf_btr *btr) |
e98a2d6e PP |
967 | { |
968 | return read_basic_type_and_call_continue(btr, | |
969 | read_basic_float_and_call_cb); | |
970 | } | |
971 | ||
972 | static inline | |
973 | enum bt_ctf_btr_status read_basic_enum_type_and_call_begin( | |
dfef8367 | 974 | struct bt_ctf_btr *btr) |
e98a2d6e PP |
975 | { |
976 | return read_basic_type_and_call_begin(btr, | |
977 | read_basic_enum_and_call_cb); | |
978 | } | |
979 | ||
980 | static inline | |
981 | enum bt_ctf_btr_status read_basic_enum_type_and_call_continue( | |
dfef8367 | 982 | struct bt_ctf_btr *btr) |
e98a2d6e PP |
983 | { |
984 | return read_basic_type_and_call_continue(btr, | |
985 | read_basic_enum_and_call_cb); | |
986 | } | |
987 | ||
988 | static inline | |
989 | enum bt_ctf_btr_status read_basic_string_type_and_call( | |
dfef8367 | 990 | struct bt_ctf_btr *btr, bool begin) |
e98a2d6e PP |
991 | { |
992 | size_t buf_at_bytes; | |
993 | const uint8_t *result; | |
994 | size_t available_bytes; | |
995 | const uint8_t *first_chr; | |
996 | enum bt_ctf_btr_status status = BT_CTF_BTR_STATUS_OK; | |
997 | ||
998 | if (!at_least_one_bit_left(btr)) { | |
dfef8367 | 999 | BT_LOGV("Reached end of data: btr-addr=%p", btr); |
e98a2d6e PP |
1000 | status = BT_CTF_BTR_STATUS_EOF; |
1001 | goto end; | |
1002 | } | |
1003 | ||
1004 | assert(buf_at_from_addr(btr) % 8 == 0); | |
1005 | available_bytes = BITS_TO_BYTES_FLOOR(available_bits(btr)); | |
1006 | buf_at_bytes = BITS_TO_BYTES_FLOOR(buf_at_from_addr(btr)); | |
1007 | first_chr = &btr->buf.addr[buf_at_bytes]; | |
1008 | result = memchr(first_chr, '\0', available_bytes); | |
1009 | ||
1010 | if (begin && btr->user.cbs.types.string_begin) { | |
dfef8367 | 1011 | BT_LOGV("Calling user function (string, beginning)."); |
e98a2d6e PP |
1012 | status = btr->user.cbs.types.string_begin( |
1013 | btr->cur_basic_field_type, btr->user.data); | |
dfef8367 PP |
1014 | BT_LOGV("User function returned: status=%s", |
1015 | bt_ctf_btr_status_string(status)); | |
e98a2d6e | 1016 | if (status != BT_CTF_BTR_STATUS_OK) { |
dfef8367 PP |
1017 | BT_LOGW("User function failed: btr-addr=%p, status=%s", |
1018 | btr, bt_ctf_btr_status_string(status)); | |
e98a2d6e PP |
1019 | goto end; |
1020 | } | |
1021 | } | |
1022 | ||
1023 | if (!result) { | |
1024 | /* No null character yet */ | |
1025 | if (btr->user.cbs.types.string) { | |
dfef8367 | 1026 | BT_LOGV("Calling user function (substring)."); |
e98a2d6e PP |
1027 | status = btr->user.cbs.types.string( |
1028 | (const char *) first_chr, | |
1029 | available_bytes, btr->cur_basic_field_type, | |
1030 | btr->user.data); | |
dfef8367 PP |
1031 | BT_LOGV("User function returned: status=%s", |
1032 | bt_ctf_btr_status_string(status)); | |
e98a2d6e | 1033 | if (status != BT_CTF_BTR_STATUS_OK) { |
dfef8367 PP |
1034 | BT_LOGW("User function failed: " |
1035 | "btr-addr=%p, status=%s", | |
1036 | btr, bt_ctf_btr_status_string(status)); | |
e98a2d6e PP |
1037 | goto end; |
1038 | } | |
1039 | } | |
1040 | ||
1041 | consume_bits(btr, BYTES_TO_BITS(available_bytes)); | |
1042 | btr->state = BTR_STATE_READ_BASIC_CONTINUE; | |
1043 | status = BT_CTF_BTR_STATUS_EOF; | |
1044 | } else { | |
1045 | /* Found the null character */ | |
1046 | size_t result_len = (size_t) (result - first_chr); | |
1047 | ||
1048 | if (btr->user.cbs.types.string && result_len) { | |
dfef8367 | 1049 | BT_LOGV("Calling user function (substring)."); |
e98a2d6e PP |
1050 | status = btr->user.cbs.types.string( |
1051 | (const char *) first_chr, | |
1052 | result_len, btr->cur_basic_field_type, | |
1053 | btr->user.data); | |
dfef8367 PP |
1054 | BT_LOGV("User function returned: status=%s", |
1055 | bt_ctf_btr_status_string(status)); | |
e98a2d6e | 1056 | if (status != BT_CTF_BTR_STATUS_OK) { |
dfef8367 PP |
1057 | BT_LOGW("User function failed: " |
1058 | "btr-addr=%p, status=%s", | |
1059 | btr, bt_ctf_btr_status_string(status)); | |
e98a2d6e PP |
1060 | goto end; |
1061 | } | |
1062 | } | |
1063 | ||
1064 | if (btr->user.cbs.types.string_end) { | |
dfef8367 | 1065 | BT_LOGV("Calling user function (string, end)."); |
e98a2d6e PP |
1066 | status = btr->user.cbs.types.string_end( |
1067 | btr->cur_basic_field_type, btr->user.data); | |
dfef8367 PP |
1068 | BT_LOGV("User function returned: status=%s", |
1069 | bt_ctf_btr_status_string(status)); | |
e98a2d6e | 1070 | if (status != BT_CTF_BTR_STATUS_OK) { |
dfef8367 PP |
1071 | BT_LOGW("User function failed: " |
1072 | "btr-addr=%p, status=%s", | |
1073 | btr, bt_ctf_btr_status_string(status)); | |
e98a2d6e PP |
1074 | goto end; |
1075 | } | |
1076 | } | |
1077 | ||
1078 | consume_bits(btr, BYTES_TO_BITS(result_len + 1)); | |
1079 | ||
1080 | if (stack_empty(btr->stack)) { | |
1081 | /* Root is a basic type */ | |
1082 | btr->state = BTR_STATE_DONE; | |
1083 | } else { | |
1084 | /* Go to next field */ | |
1085 | stack_top(btr->stack)->index++; | |
1086 | btr->state = BTR_STATE_NEXT_FIELD; | |
1087 | btr->last_bo = btr->cur_bo; | |
1088 | } | |
1089 | } | |
1090 | ||
1091 | end: | |
1092 | return status; | |
1093 | } | |
1094 | ||
1095 | static inline | |
1096 | enum bt_ctf_btr_status read_basic_begin_state(struct bt_ctf_btr *btr) | |
1097 | { | |
1098 | enum bt_ctf_btr_status status; | |
1099 | ||
1100 | assert(btr->cur_basic_field_type); | |
1101 | ||
1102 | switch (bt_ctf_field_type_get_type_id(btr->cur_basic_field_type)) { | |
1487a16a | 1103 | case BT_CTF_FIELD_TYPE_ID_INTEGER: |
e98a2d6e PP |
1104 | status = read_basic_int_type_and_call_begin(btr); |
1105 | break; | |
1487a16a | 1106 | case BT_CTF_FIELD_TYPE_ID_FLOAT: |
e98a2d6e PP |
1107 | status = read_basic_float_type_and_call_begin(btr); |
1108 | break; | |
1487a16a | 1109 | case BT_CTF_FIELD_TYPE_ID_ENUM: |
e98a2d6e PP |
1110 | status = read_basic_enum_type_and_call_begin(btr); |
1111 | break; | |
1487a16a | 1112 | case BT_CTF_FIELD_TYPE_ID_STRING: |
e98a2d6e PP |
1113 | status = read_basic_string_type_and_call(btr, true); |
1114 | break; | |
1115 | default: | |
dfef8367 PP |
1116 | BT_LOGF("Unknown basic field type ID: " |
1117 | "btr-addr=%p, ft-addr=%p, ft-id=%s", | |
1118 | btr, btr->cur_basic_field_type, | |
1119 | bt_ctf_field_type_id_string( | |
1120 | bt_ctf_field_type_get_type_id( | |
1121 | btr->cur_basic_field_type))); | |
0fbb9a9f | 1122 | abort(); |
e98a2d6e PP |
1123 | } |
1124 | ||
1125 | return status; | |
1126 | } | |
1127 | ||
1128 | static inline | |
1129 | enum bt_ctf_btr_status read_basic_continue_state(struct bt_ctf_btr *btr) | |
1130 | { | |
1131 | enum bt_ctf_btr_status status; | |
1132 | ||
1133 | assert(btr->cur_basic_field_type); | |
1134 | ||
1135 | switch (bt_ctf_field_type_get_type_id(btr->cur_basic_field_type)) { | |
1487a16a | 1136 | case BT_CTF_FIELD_TYPE_ID_INTEGER: |
e98a2d6e PP |
1137 | status = read_basic_int_type_and_call_continue(btr); |
1138 | break; | |
1487a16a | 1139 | case BT_CTF_FIELD_TYPE_ID_FLOAT: |
e98a2d6e PP |
1140 | status = read_basic_float_type_and_call_continue(btr); |
1141 | break; | |
1487a16a | 1142 | case BT_CTF_FIELD_TYPE_ID_ENUM: |
e98a2d6e PP |
1143 | status = read_basic_enum_type_and_call_continue(btr); |
1144 | break; | |
1487a16a | 1145 | case BT_CTF_FIELD_TYPE_ID_STRING: |
e98a2d6e PP |
1146 | status = read_basic_string_type_and_call(btr, false); |
1147 | break; | |
1148 | default: | |
dfef8367 PP |
1149 | BT_LOGF("Unknown basic field type ID: " |
1150 | "btr-addr=%p, ft-addr=%p, ft-id=%s", | |
1151 | btr, btr->cur_basic_field_type, | |
1152 | bt_ctf_field_type_id_string( | |
1153 | bt_ctf_field_type_get_type_id( | |
1154 | btr->cur_basic_field_type))); | |
0fbb9a9f | 1155 | abort(); |
e98a2d6e PP |
1156 | } |
1157 | ||
1158 | return status; | |
1159 | } | |
1160 | ||
1161 | static inline | |
1162 | size_t bits_to_skip_to_align_to(struct bt_ctf_btr *btr, size_t align) | |
1163 | { | |
1164 | size_t aligned_packet_at; | |
1165 | ||
1166 | aligned_packet_at = ALIGN(packet_at(btr), align); | |
e98a2d6e PP |
1167 | return aligned_packet_at - packet_at(btr); |
1168 | } | |
1169 | ||
1170 | static inline | |
1171 | enum bt_ctf_btr_status align_type_state(struct bt_ctf_btr *btr, | |
dfef8367 | 1172 | struct bt_ctf_field_type *field_type, enum btr_state next_state) |
e98a2d6e PP |
1173 | { |
1174 | int field_alignment; | |
1175 | size_t skip_bits; | |
1176 | enum bt_ctf_btr_status status = BT_CTF_BTR_STATUS_OK; | |
1177 | ||
1178 | /* Get field's alignment */ | |
1179 | field_alignment = bt_ctf_field_type_get_alignment(field_type); | |
1180 | if (field_alignment < 0) { | |
dfef8367 PP |
1181 | BT_LOGW("Cannot get field type's alignment: " |
1182 | "btr-addr=%p, ft-addr=%p, ft-id=%s", | |
1183 | btr, field_type, | |
1184 | bt_ctf_field_type_id_string( | |
1185 | bt_ctf_field_type_get_type_id(field_type))); | |
e98a2d6e PP |
1186 | status = BT_CTF_BTR_STATUS_ERROR; |
1187 | goto end; | |
1188 | } | |
1189 | ||
1190 | /* | |
1191 | * 0 means "undefined" for variants; what we really want is 1 | |
1192 | * (always aligned) | |
1193 | */ | |
1194 | if (field_alignment == 0) { | |
1195 | field_alignment = 1; | |
1196 | } | |
1197 | ||
1198 | /* Compute how many bits we need to skip */ | |
1199 | skip_bits = bits_to_skip_to_align_to(btr, field_alignment); | |
1200 | ||
1201 | /* Nothing to skip? aligned */ | |
1202 | if (skip_bits == 0) { | |
1203 | btr->state = next_state; | |
1204 | goto end; | |
1205 | } | |
1206 | ||
1207 | /* Make sure there's at least one bit left */ | |
1208 | if (!at_least_one_bit_left(btr)) { | |
1209 | status = BT_CTF_BTR_STATUS_EOF; | |
1210 | goto end; | |
1211 | } | |
1212 | ||
1213 | /* Consume as many bits as possible in what's left */ | |
1214 | consume_bits(btr, MIN(available_bits(btr), skip_bits)); | |
1215 | ||
1216 | /* Are we done now? */ | |
1217 | skip_bits = bits_to_skip_to_align_to(btr, field_alignment); | |
e98a2d6e PP |
1218 | if (skip_bits == 0) { |
1219 | /* Yes: go to next state */ | |
1220 | btr->state = next_state; | |
1221 | goto end; | |
1222 | } else { | |
1223 | /* No: need more data */ | |
dfef8367 | 1224 | BT_LOGV("Reached end of data when aligning: btr-addr=%p", btr); |
e98a2d6e PP |
1225 | status = BT_CTF_BTR_STATUS_EOF; |
1226 | } | |
1227 | ||
1228 | end: | |
1229 | return status; | |
1230 | } | |
1231 | ||
1232 | static inline | |
1233 | bool is_compound_type(struct bt_ctf_field_type *field_type) | |
1234 | { | |
1487a16a | 1235 | enum bt_ctf_field_type_id id = bt_ctf_field_type_get_type_id(field_type); |
e98a2d6e | 1236 | |
1487a16a PP |
1237 | return id == BT_CTF_FIELD_TYPE_ID_STRUCT || id == BT_CTF_FIELD_TYPE_ID_ARRAY || |
1238 | id == BT_CTF_FIELD_TYPE_ID_SEQUENCE || id == BT_CTF_FIELD_TYPE_ID_VARIANT; | |
e98a2d6e PP |
1239 | } |
1240 | ||
1241 | static inline | |
1242 | enum bt_ctf_btr_status next_field_state(struct bt_ctf_btr *btr) | |
1243 | { | |
1244 | int ret; | |
1245 | struct stack_entry *top; | |
1246 | struct bt_ctf_field_type *next_field_type = NULL; | |
1247 | enum bt_ctf_btr_status status = BT_CTF_BTR_STATUS_OK; | |
1248 | ||
1249 | if (stack_empty(btr->stack)) { | |
1250 | goto end; | |
1251 | } | |
1252 | ||
1253 | top = stack_top(btr->stack); | |
1254 | ||
1255 | /* Are we done with this base type? */ | |
1256 | while (top->index == top->base_len) { | |
1257 | if (btr->user.cbs.types.compound_end) { | |
dfef8367 | 1258 | BT_LOGV("Calling user function (compound, end)."); |
e98a2d6e PP |
1259 | status = btr->user.cbs.types.compound_end( |
1260 | top->base_type, btr->user.data); | |
dfef8367 PP |
1261 | BT_LOGV("User function returned: status=%s", |
1262 | bt_ctf_btr_status_string(status)); | |
e98a2d6e | 1263 | if (status != BT_CTF_BTR_STATUS_OK) { |
dfef8367 PP |
1264 | BT_LOGW("User function failed: btr-addr=%p, status=%s", |
1265 | btr, bt_ctf_btr_status_string(status)); | |
e98a2d6e PP |
1266 | goto end; |
1267 | } | |
1268 | } | |
1269 | ||
1270 | stack_pop(btr->stack); | |
1271 | ||
1272 | /* Are we done with the root type? */ | |
1273 | if (stack_empty(btr->stack)) { | |
1274 | btr->state = BTR_STATE_DONE; | |
1275 | goto end; | |
1276 | } | |
1277 | ||
1278 | top = stack_top(btr->stack); | |
1279 | top->index++; | |
1280 | } | |
1281 | ||
1282 | /* Get next field's type */ | |
1283 | switch (bt_ctf_field_type_get_type_id(top->base_type)) { | |
1487a16a | 1284 | case BT_CTF_FIELD_TYPE_ID_STRUCT: |
e98a2d6e PP |
1285 | ret = bt_ctf_field_type_structure_get_field( |
1286 | top->base_type, NULL, &next_field_type, | |
1287 | top->index); | |
1288 | if (ret) { | |
1289 | next_field_type = NULL; | |
1290 | } | |
1291 | break; | |
1487a16a | 1292 | case BT_CTF_FIELD_TYPE_ID_ARRAY: |
e98a2d6e PP |
1293 | next_field_type = |
1294 | bt_ctf_field_type_array_get_element_type( | |
1295 | top->base_type); | |
1296 | break; | |
1487a16a | 1297 | case BT_CTF_FIELD_TYPE_ID_SEQUENCE: |
e98a2d6e PP |
1298 | next_field_type = |
1299 | bt_ctf_field_type_sequence_get_element_type( | |
1300 | top->base_type); | |
1301 | break; | |
1487a16a | 1302 | case BT_CTF_FIELD_TYPE_ID_VARIANT: |
e98a2d6e PP |
1303 | /* Variant types are dynamic: query the user, he should know! */ |
1304 | next_field_type = | |
1305 | btr->user.cbs.query.get_variant_type( | |
1306 | top->base_type, btr->user.data); | |
1307 | break; | |
1308 | default: | |
1309 | break; | |
1310 | } | |
1311 | ||
1312 | if (!next_field_type) { | |
dfef8367 PP |
1313 | BT_LOGW("Cannot get the field type of the next field: " |
1314 | "btr-addr=%p, base-ft-addr=%p, base-ft-id=%s, " | |
1315 | "index=%" PRId64, | |
1316 | btr, top->base_type, | |
1317 | bt_ctf_field_type_id_string( | |
1318 | bt_ctf_field_type_get_type_id(top->base_type)), | |
1319 | top->index); | |
e98a2d6e PP |
1320 | status = BT_CTF_BTR_STATUS_ERROR; |
1321 | goto end; | |
1322 | } | |
1323 | ||
1324 | if (is_compound_type(next_field_type)) { | |
1325 | if (btr->user.cbs.types.compound_begin) { | |
dfef8367 | 1326 | BT_LOGV("Calling user function (compound, begin)."); |
e98a2d6e PP |
1327 | status = btr->user.cbs.types.compound_begin( |
1328 | next_field_type, btr->user.data); | |
dfef8367 PP |
1329 | BT_LOGV("User function returned: status=%s", |
1330 | bt_ctf_btr_status_string(status)); | |
e98a2d6e | 1331 | if (status != BT_CTF_BTR_STATUS_OK) { |
dfef8367 PP |
1332 | BT_LOGW("User function failed: btr-addr=%p, status=%s", |
1333 | btr, bt_ctf_btr_status_string(status)); | |
e98a2d6e PP |
1334 | goto end; |
1335 | } | |
1336 | } | |
1337 | ||
1338 | ret = stack_push_with_len(btr, next_field_type); | |
1339 | if (ret) { | |
dfef8367 | 1340 | /* stack_push_with_len() logs errors */ |
e98a2d6e PP |
1341 | status = BT_CTF_BTR_STATUS_ERROR; |
1342 | goto end; | |
1343 | } | |
1344 | ||
1345 | /* Next state: align a compound type */ | |
1346 | btr->state = BTR_STATE_ALIGN_COMPOUND; | |
1347 | } else { | |
1348 | /* Replace current basic field type */ | |
dfef8367 PP |
1349 | BT_LOGV("Replacing current basic field type: " |
1350 | "btr-addr=%p, cur-basic-ft-addr=%p, " | |
1351 | "next-basic-ft-addr=%p", | |
1352 | btr, btr->cur_basic_field_type, next_field_type); | |
e98a2d6e PP |
1353 | BT_MOVE(btr->cur_basic_field_type, next_field_type); |
1354 | ||
1355 | /* Next state: align a basic type */ | |
1356 | btr->state = BTR_STATE_ALIGN_BASIC; | |
1357 | } | |
1358 | ||
1359 | end: | |
1360 | BT_PUT(next_field_type); | |
1361 | ||
1362 | return status; | |
1363 | } | |
1364 | ||
1365 | static inline | |
1366 | enum bt_ctf_btr_status handle_state(struct bt_ctf_btr *btr) | |
1367 | { | |
1368 | enum bt_ctf_btr_status status = BT_CTF_BTR_STATUS_OK; | |
1369 | ||
dfef8367 PP |
1370 | BT_LOGV("Handling state: btr-addr=%p, state=%s", |
1371 | btr, btr_state_string(btr->state)); | |
1372 | ||
e98a2d6e PP |
1373 | switch (btr->state) { |
1374 | case BTR_STATE_NEXT_FIELD: | |
1375 | status = next_field_state(btr); | |
1376 | break; | |
1377 | case BTR_STATE_ALIGN_BASIC: | |
1378 | status = align_type_state(btr, btr->cur_basic_field_type, | |
1379 | BTR_STATE_READ_BASIC_BEGIN); | |
1380 | break; | |
1381 | case BTR_STATE_ALIGN_COMPOUND: | |
1382 | status = align_type_state(btr, stack_top(btr->stack)->base_type, | |
1383 | BTR_STATE_NEXT_FIELD); | |
1384 | break; | |
1385 | case BTR_STATE_READ_BASIC_BEGIN: | |
1386 | status = read_basic_begin_state(btr); | |
1387 | break; | |
1388 | case BTR_STATE_READ_BASIC_CONTINUE: | |
1389 | status = read_basic_continue_state(btr); | |
1390 | break; | |
1391 | case BTR_STATE_DONE: | |
1392 | break; | |
1393 | } | |
1394 | ||
dfef8367 PP |
1395 | BT_LOGV("Handled state: btr-addr=%p, status=%s", |
1396 | btr, bt_ctf_btr_status_string(status)); | |
e98a2d6e PP |
1397 | return status; |
1398 | } | |
1399 | ||
55314f2a | 1400 | struct bt_ctf_btr *bt_ctf_btr_create(struct bt_ctf_btr_cbs cbs, void *data) |
e98a2d6e PP |
1401 | { |
1402 | struct bt_ctf_btr *btr; | |
1403 | ||
dfef8367 | 1404 | BT_LOGD_STR("Creating binary type reader (BTR)."); |
e98a2d6e PP |
1405 | btr = g_new0(struct bt_ctf_btr, 1); |
1406 | if (!btr) { | |
dfef8367 | 1407 | BT_LOGE_STR("Failed to allocate one binary type reader."); |
e98a2d6e PP |
1408 | goto end; |
1409 | } | |
1410 | ||
1411 | btr->stack = stack_new(); | |
1412 | if (!btr->stack) { | |
dfef8367 | 1413 | BT_LOGE_STR("Cannot create BTR's stack."); |
e98a2d6e PP |
1414 | bt_ctf_btr_destroy(btr); |
1415 | btr = NULL; | |
1416 | goto end; | |
1417 | } | |
1418 | ||
1419 | btr->state = BTR_STATE_NEXT_FIELD; | |
1420 | btr->user.cbs = cbs; | |
1421 | btr->user.data = data; | |
dfef8367 | 1422 | BT_LOGD("Created BTR: addr=%p", btr); |
e98a2d6e PP |
1423 | |
1424 | end: | |
1425 | return btr; | |
1426 | } | |
1427 | ||
1428 | void bt_ctf_btr_destroy(struct bt_ctf_btr *btr) | |
1429 | { | |
1430 | if (btr->stack) { | |
1431 | stack_destroy(btr->stack); | |
1432 | } | |
1433 | ||
dfef8367 | 1434 | BT_LOGD("Destroying BTR: addr=%p", btr); |
e98a2d6e PP |
1435 | BT_PUT(btr->cur_basic_field_type); |
1436 | g_free(btr); | |
1437 | } | |
1438 | ||
1439 | static | |
1440 | void reset(struct bt_ctf_btr *btr) | |
1441 | { | |
dfef8367 | 1442 | BT_LOGD("Resetting BTR: addr=%p", btr); |
e98a2d6e PP |
1443 | stack_clear(btr->stack); |
1444 | BT_PUT(btr->cur_basic_field_type); | |
1445 | stitch_reset(btr); | |
1446 | btr->buf.addr = NULL; | |
1447 | btr->last_bo = BT_CTF_BYTE_ORDER_UNKNOWN; | |
1448 | } | |
1449 | ||
dfef8367 PP |
1450 | static |
1451 | void update_packet_offset(struct bt_ctf_btr *btr) | |
1452 | { | |
1453 | BT_LOGV("Updating packet offset for next call: " | |
1454 | "btr-addr=%p, cur-packet-offset=%zu, next-packet-offset=%zu", | |
1455 | btr, btr->buf.packet_offset, | |
1456 | btr->buf.packet_offset + btr->buf.at); | |
1457 | btr->buf.packet_offset += btr->buf.at; | |
1458 | } | |
1459 | ||
e98a2d6e PP |
1460 | size_t bt_ctf_btr_start(struct bt_ctf_btr *btr, |
1461 | struct bt_ctf_field_type *type, const uint8_t *buf, | |
1462 | size_t offset, size_t packet_offset, size_t sz, | |
1463 | enum bt_ctf_btr_status *status) | |
1464 | { | |
1465 | assert(btr); | |
1466 | assert(buf); | |
1467 | assert(sz > 0); | |
1468 | assert(BYTES_TO_BITS(sz) > offset); | |
1469 | reset(btr); | |
1470 | btr->buf.addr = buf; | |
1471 | btr->buf.offset = offset; | |
1472 | btr->buf.at = 0; | |
1473 | btr->buf.packet_offset = packet_offset; | |
1474 | btr->buf.buf_sz = sz; | |
1475 | btr->buf.sz = BYTES_TO_BITS(sz) - offset; | |
1476 | *status = BT_CTF_BTR_STATUS_OK; | |
1477 | ||
dfef8367 PP |
1478 | BT_LOGV("Starting decoding: btr-addr=%p, ft-addr=%p, " |
1479 | "buf-addr=%p, buf-size=%zu, offset=%zu, " | |
1480 | "packet-offset=%zu", | |
1481 | btr, type, buf, sz, offset, packet_offset); | |
1482 | ||
e98a2d6e PP |
1483 | /* Set root type */ |
1484 | if (is_compound_type(type)) { | |
1485 | /* Compound type: push on visit stack */ | |
1486 | int stack_ret; | |
1487 | ||
1488 | if (btr->user.cbs.types.compound_begin) { | |
dfef8367 | 1489 | BT_LOGV("Calling user function (compound, begin)."); |
e98a2d6e PP |
1490 | *status = btr->user.cbs.types.compound_begin( |
1491 | type, btr->user.data); | |
dfef8367 PP |
1492 | BT_LOGV("User function returned: status=%s", |
1493 | bt_ctf_btr_status_string(*status)); | |
e98a2d6e | 1494 | if (*status != BT_CTF_BTR_STATUS_OK) { |
dfef8367 PP |
1495 | BT_LOGW("User function failed: btr-addr=%p, status=%s", |
1496 | btr, bt_ctf_btr_status_string(*status)); | |
e98a2d6e PP |
1497 | goto end; |
1498 | } | |
1499 | } | |
1500 | ||
1501 | stack_ret = stack_push_with_len(btr, type); | |
1502 | if (stack_ret) { | |
dfef8367 | 1503 | /* stack_push_with_len() logs errors */ |
e98a2d6e PP |
1504 | *status = BT_CTF_BTR_STATUS_ERROR; |
1505 | goto end; | |
1506 | } | |
1507 | ||
1508 | btr->state = BTR_STATE_ALIGN_COMPOUND; | |
1509 | } else { | |
1510 | /* Basic type: set as current basic type */ | |
1511 | btr->cur_basic_field_type = type; | |
1512 | bt_get(btr->cur_basic_field_type); | |
1513 | btr->state = BTR_STATE_ALIGN_BASIC; | |
1514 | } | |
1515 | ||
1516 | /* Run the machine! */ | |
dfef8367 PP |
1517 | BT_LOGV_STR("Running the state machine."); |
1518 | ||
e98a2d6e PP |
1519 | while (true) { |
1520 | *status = handle_state(btr); | |
fdf0e7a0 PP |
1521 | if (*status != BT_CTF_BTR_STATUS_OK || |
1522 | btr->state == BTR_STATE_DONE) { | |
e98a2d6e PP |
1523 | break; |
1524 | } | |
1525 | } | |
1526 | ||
1527 | /* Update packet offset for next time */ | |
dfef8367 | 1528 | update_packet_offset(btr); |
e98a2d6e PP |
1529 | |
1530 | end: | |
1531 | return btr->buf.at; | |
1532 | } | |
1533 | ||
1534 | size_t bt_ctf_btr_continue(struct bt_ctf_btr *btr, | |
1535 | const uint8_t *buf, size_t sz, | |
1536 | enum bt_ctf_btr_status *status) | |
1537 | { | |
1538 | assert(btr); | |
1539 | assert(buf); | |
1540 | assert(sz > 0); | |
1541 | btr->buf.addr = buf; | |
1542 | btr->buf.offset = 0; | |
1543 | btr->buf.at = 0; | |
1544 | btr->buf.buf_sz = sz; | |
1545 | btr->buf.sz = BYTES_TO_BITS(sz); | |
1546 | *status = BT_CTF_BTR_STATUS_OK; | |
1547 | ||
dfef8367 PP |
1548 | BT_LOGV("Continuing decoding: btr-addr=%p, buf-addr=%p, buf-size=%zu", |
1549 | btr, buf, sz); | |
1550 | ||
e98a2d6e | 1551 | /* Continue running the machine */ |
dfef8367 PP |
1552 | BT_LOGV_STR("Running the state machine."); |
1553 | ||
e98a2d6e PP |
1554 | while (true) { |
1555 | *status = handle_state(btr); | |
fdf0e7a0 PP |
1556 | if (*status != BT_CTF_BTR_STATUS_OK || |
1557 | btr->state == BTR_STATE_DONE) { | |
e98a2d6e PP |
1558 | break; |
1559 | } | |
1560 | } | |
1561 | ||
1562 | /* Update packet offset for next time */ | |
dfef8367 | 1563 | update_packet_offset(btr); |
e98a2d6e PP |
1564 | return btr->buf.at; |
1565 | } |