| 1 | /* |
| 2 | * Babeltrace - CTF binary field class reader (BFCR) |
| 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 | |
| 26 | #define BT_LOG_TAG "PLUGIN-CTF-BFCR" |
| 27 | #include "logging.h" |
| 28 | |
| 29 | #include <stdlib.h> |
| 30 | #include <stdint.h> |
| 31 | #include <inttypes.h> |
| 32 | #include <stdio.h> |
| 33 | #include <stddef.h> |
| 34 | #include <stdbool.h> |
| 35 | #include <babeltrace/assert-internal.h> |
| 36 | #include <string.h> |
| 37 | #include <babeltrace/bitfield-internal.h> |
| 38 | #include <babeltrace/common-internal.h> |
| 39 | #include <babeltrace/babeltrace.h> |
| 40 | #include <babeltrace/align-internal.h> |
| 41 | #include <glib.h> |
| 42 | |
| 43 | #include "bfcr.h" |
| 44 | #include "../metadata/ctf-meta.h" |
| 45 | |
| 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 class of base field, one of: |
| 56 | * |
| 57 | * * Structure |
| 58 | * * Array |
| 59 | * * Sequence |
| 60 | * * Variant |
| 61 | */ |
| 62 | struct ctf_field_class *base_class; |
| 63 | |
| 64 | /* Length of base field (always 1 for a variant class) */ |
| 65 | int64_t base_len; |
| 66 | |
| 67 | /* Index of next field to read */ |
| 68 | int64_t index; |
| 69 | }; |
| 70 | |
| 71 | /* Visit stack */ |
| 72 | struct stack { |
| 73 | /* Entries (struct stack_entry) */ |
| 74 | GArray *entries; |
| 75 | |
| 76 | /* Number of active entries */ |
| 77 | size_t size; |
| 78 | }; |
| 79 | |
| 80 | /* Reading states */ |
| 81 | enum bfcr_state { |
| 82 | BFCR_STATE_NEXT_FIELD, |
| 83 | BFCR_STATE_ALIGN_BASIC, |
| 84 | BFCR_STATE_ALIGN_COMPOUND, |
| 85 | BFCR_STATE_READ_BASIC_BEGIN, |
| 86 | BFCR_STATE_READ_BASIC_CONTINUE, |
| 87 | BFCR_STATE_DONE, |
| 88 | }; |
| 89 | |
| 90 | /* Binary class reader */ |
| 91 | struct bt_bfcr { |
| 92 | /* Bisit stack */ |
| 93 | struct stack *stack; |
| 94 | |
| 95 | /* Current basic field class */ |
| 96 | struct ctf_field_class *cur_basic_field_class; |
| 97 | |
| 98 | /* Current state */ |
| 99 | enum bfcr_state state; |
| 100 | |
| 101 | /* |
| 102 | * Last basic field class's byte order. |
| 103 | * |
| 104 | * This is used to detect errors since two contiguous basic |
| 105 | * classes for which the common boundary is not the boundary of |
| 106 | * a byte cannot have different byte orders. |
| 107 | * |
| 108 | * This is set to -1 on reset and when the last basic field class |
| 109 | * was a string class. |
| 110 | */ |
| 111 | enum ctf_byte_order last_bo; |
| 112 | |
| 113 | /* Current byte order (copied to last_bo after a successful read) */ |
| 114 | enum ctf_byte_order cur_bo; |
| 115 | |
| 116 | /* Stitch buffer infos */ |
| 117 | struct { |
| 118 | /* Stitch buffer */ |
| 119 | uint8_t buf[16]; |
| 120 | |
| 121 | /* Offset, within stitch buffer, of first bit */ |
| 122 | size_t offset; |
| 123 | |
| 124 | /* Length (bits) of data in stitch buffer from offset */ |
| 125 | size_t at; |
| 126 | } stitch; |
| 127 | |
| 128 | /* User buffer infos */ |
| 129 | struct { |
| 130 | /* Address */ |
| 131 | const uint8_t *addr; |
| 132 | |
| 133 | /* Offset of data from address (bits) */ |
| 134 | size_t offset; |
| 135 | |
| 136 | /* Current position from offset (bits) */ |
| 137 | size_t at; |
| 138 | |
| 139 | /* Offset of offset within whole packet (bits) */ |
| 140 | size_t packet_offset; |
| 141 | |
| 142 | /* Data size in buffer (bits) */ |
| 143 | size_t sz; |
| 144 | |
| 145 | /* Buffer size (bytes) */ |
| 146 | size_t buf_sz; |
| 147 | } buf; |
| 148 | |
| 149 | /* User stuff */ |
| 150 | struct { |
| 151 | /* Callback functions */ |
| 152 | struct bt_bfcr_cbs cbs; |
| 153 | |
| 154 | /* Private data */ |
| 155 | void *data; |
| 156 | } user; |
| 157 | }; |
| 158 | |
| 159 | static inline |
| 160 | const char *bfcr_state_string(enum bfcr_state state) |
| 161 | { |
| 162 | switch (state) { |
| 163 | case BFCR_STATE_NEXT_FIELD: |
| 164 | return "BFCR_STATE_NEXT_FIELD"; |
| 165 | case BFCR_STATE_ALIGN_BASIC: |
| 166 | return "BFCR_STATE_ALIGN_BASIC"; |
| 167 | case BFCR_STATE_ALIGN_COMPOUND: |
| 168 | return "BFCR_STATE_ALIGN_COMPOUND"; |
| 169 | case BFCR_STATE_READ_BASIC_BEGIN: |
| 170 | return "BFCR_STATE_READ_BASIC_BEGIN"; |
| 171 | case BFCR_STATE_READ_BASIC_CONTINUE: |
| 172 | return "BFCR_STATE_READ_BASIC_CONTINUE"; |
| 173 | case BFCR_STATE_DONE: |
| 174 | return "BFCR_STATE_DONE"; |
| 175 | default: |
| 176 | return "(unknown)"; |
| 177 | } |
| 178 | } |
| 179 | |
| 180 | static |
| 181 | struct stack *stack_new(void) |
| 182 | { |
| 183 | struct stack *stack = NULL; |
| 184 | |
| 185 | stack = g_new0(struct stack, 1); |
| 186 | if (!stack) { |
| 187 | BT_LOGE_STR("Failed to allocate one stack."); |
| 188 | goto error; |
| 189 | } |
| 190 | |
| 191 | stack->entries = g_array_new(FALSE, TRUE, sizeof(struct stack_entry)); |
| 192 | if (!stack->entries) { |
| 193 | BT_LOGE_STR("Failed to allocate a GArray."); |
| 194 | goto error; |
| 195 | } |
| 196 | |
| 197 | BT_LOGD("Created stack: addr=%p", stack); |
| 198 | return stack; |
| 199 | |
| 200 | error: |
| 201 | g_free(stack); |
| 202 | return NULL; |
| 203 | } |
| 204 | |
| 205 | static |
| 206 | void stack_destroy(struct stack *stack) |
| 207 | { |
| 208 | if (!stack) { |
| 209 | return; |
| 210 | } |
| 211 | |
| 212 | BT_LOGD("Destroying stack: addr=%p", stack); |
| 213 | |
| 214 | if (stack->entries) { |
| 215 | g_array_free(stack->entries, TRUE); |
| 216 | } |
| 217 | |
| 218 | g_free(stack); |
| 219 | } |
| 220 | |
| 221 | static |
| 222 | int stack_push(struct stack *stack, struct ctf_field_class *base_class, |
| 223 | size_t base_len) |
| 224 | { |
| 225 | struct stack_entry *entry; |
| 226 | |
| 227 | BT_ASSERT(stack); |
| 228 | BT_ASSERT(base_class); |
| 229 | BT_LOGV("Pushing field class on stack: stack-addr=%p, " |
| 230 | "fc-addr=%p, fc-type=%d, base-length=%zu, " |
| 231 | "stack-size-before=%zu, stack-size-after=%zu", |
| 232 | stack, base_class, base_class->type, |
| 233 | base_len, stack->size, stack->size + 1); |
| 234 | |
| 235 | if (stack->entries->len == stack->size) { |
| 236 | g_array_set_size(stack->entries, stack->size + 1); |
| 237 | } |
| 238 | |
| 239 | entry = &g_array_index(stack->entries, struct stack_entry, stack->size); |
| 240 | entry->base_class = base_class; |
| 241 | entry->base_len = base_len; |
| 242 | entry->index = 0; |
| 243 | stack->size++; |
| 244 | return 0; |
| 245 | } |
| 246 | |
| 247 | static inline |
| 248 | int64_t get_compound_field_class_length(struct bt_bfcr *bfcr, |
| 249 | struct ctf_field_class *fc) |
| 250 | { |
| 251 | int64_t length; |
| 252 | |
| 253 | switch (fc->type) { |
| 254 | case CTF_FIELD_CLASS_TYPE_STRUCT: |
| 255 | { |
| 256 | struct ctf_field_class_struct *struct_fc = (void *) fc; |
| 257 | |
| 258 | length = (int64_t) struct_fc->members->len; |
| 259 | break; |
| 260 | } |
| 261 | case CTF_FIELD_CLASS_TYPE_VARIANT: |
| 262 | { |
| 263 | /* Variant field classes always "contain" a single class */ |
| 264 | length = 1; |
| 265 | break; |
| 266 | } |
| 267 | case CTF_FIELD_CLASS_TYPE_ARRAY: |
| 268 | { |
| 269 | struct ctf_field_class_array *array_fc = (void *) fc; |
| 270 | |
| 271 | length = (int64_t) array_fc->length; |
| 272 | break; |
| 273 | } |
| 274 | case CTF_FIELD_CLASS_TYPE_SEQUENCE: |
| 275 | length = bfcr->user.cbs.query.get_sequence_length(fc, |
| 276 | bfcr->user.data); |
| 277 | break; |
| 278 | default: |
| 279 | abort(); |
| 280 | } |
| 281 | |
| 282 | return length; |
| 283 | } |
| 284 | |
| 285 | static |
| 286 | int stack_push_with_len(struct bt_bfcr *bfcr, struct ctf_field_class *base_class) |
| 287 | { |
| 288 | int ret; |
| 289 | int64_t length = get_compound_field_class_length(bfcr, base_class); |
| 290 | |
| 291 | if (length < 0) { |
| 292 | BT_LOGW("Cannot get compound field class's field count: " |
| 293 | "bfcr-addr=%p, fc-addr=%p, fc-type=%d", |
| 294 | bfcr, base_class, base_class->type); |
| 295 | ret = BT_BFCR_STATUS_ERROR; |
| 296 | goto end; |
| 297 | } |
| 298 | |
| 299 | ret = stack_push(bfcr->stack, base_class, (size_t) length); |
| 300 | |
| 301 | end: |
| 302 | return ret; |
| 303 | } |
| 304 | |
| 305 | static inline |
| 306 | unsigned int stack_size(struct stack *stack) |
| 307 | { |
| 308 | BT_ASSERT(stack); |
| 309 | return stack->size; |
| 310 | } |
| 311 | |
| 312 | static |
| 313 | void stack_pop(struct stack *stack) |
| 314 | { |
| 315 | BT_ASSERT(stack); |
| 316 | BT_ASSERT(stack_size(stack)); |
| 317 | BT_LOGV("Popping from stack: " |
| 318 | "stack-addr=%p, stack-size-before=%u, stack-size-after=%u", |
| 319 | stack, stack->entries->len, stack->entries->len - 1); |
| 320 | stack->size--; |
| 321 | } |
| 322 | |
| 323 | static inline |
| 324 | bool stack_empty(struct stack *stack) |
| 325 | { |
| 326 | return stack_size(stack) == 0; |
| 327 | } |
| 328 | |
| 329 | static |
| 330 | void stack_clear(struct stack *stack) |
| 331 | { |
| 332 | BT_ASSERT(stack); |
| 333 | stack->size = 0; |
| 334 | } |
| 335 | |
| 336 | static inline |
| 337 | struct stack_entry *stack_top(struct stack *stack) |
| 338 | { |
| 339 | BT_ASSERT(stack); |
| 340 | BT_ASSERT(stack_size(stack)); |
| 341 | return &g_array_index(stack->entries, struct stack_entry, |
| 342 | stack->size - 1); |
| 343 | } |
| 344 | |
| 345 | static inline |
| 346 | size_t available_bits(struct bt_bfcr *bfcr) |
| 347 | { |
| 348 | return bfcr->buf.sz - bfcr->buf.at; |
| 349 | } |
| 350 | |
| 351 | static inline |
| 352 | void consume_bits(struct bt_bfcr *bfcr, size_t incr) |
| 353 | { |
| 354 | BT_LOGV("Advancing cursor: bfcr-addr=%p, cur-before=%zu, cur-after=%zu", |
| 355 | bfcr, bfcr->buf.at, bfcr->buf.at + incr); |
| 356 | bfcr->buf.at += incr; |
| 357 | } |
| 358 | |
| 359 | static inline |
| 360 | bool has_enough_bits(struct bt_bfcr *bfcr, size_t sz) |
| 361 | { |
| 362 | return available_bits(bfcr) >= sz; |
| 363 | } |
| 364 | |
| 365 | static inline |
| 366 | bool at_least_one_bit_left(struct bt_bfcr *bfcr) |
| 367 | { |
| 368 | return has_enough_bits(bfcr, 1); |
| 369 | } |
| 370 | |
| 371 | static inline |
| 372 | size_t packet_at(struct bt_bfcr *bfcr) |
| 373 | { |
| 374 | return bfcr->buf.packet_offset + bfcr->buf.at; |
| 375 | } |
| 376 | |
| 377 | static inline |
| 378 | size_t buf_at_from_addr(struct bt_bfcr *bfcr) |
| 379 | { |
| 380 | /* |
| 381 | * Considering this: |
| 382 | * |
| 383 | * ====== offset ===== (17) |
| 384 | * |
| 385 | * xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx |
| 386 | * ^ |
| 387 | * addr (0) ==== at ==== (12) |
| 388 | * |
| 389 | * We want this: |
| 390 | * |
| 391 | * =============================== (29) |
| 392 | */ |
| 393 | return bfcr->buf.offset + bfcr->buf.at; |
| 394 | } |
| 395 | |
| 396 | static |
| 397 | void stitch_reset(struct bt_bfcr *bfcr) |
| 398 | { |
| 399 | bfcr->stitch.offset = 0; |
| 400 | bfcr->stitch.at = 0; |
| 401 | } |
| 402 | |
| 403 | static inline |
| 404 | size_t stitch_at_from_addr(struct bt_bfcr *bfcr) |
| 405 | { |
| 406 | return bfcr->stitch.offset + bfcr->stitch.at; |
| 407 | } |
| 408 | |
| 409 | static |
| 410 | void stitch_append_from_buf(struct bt_bfcr *bfcr, size_t sz) |
| 411 | { |
| 412 | size_t stitch_byte_at; |
| 413 | size_t buf_byte_at; |
| 414 | size_t nb_bytes; |
| 415 | |
| 416 | if (sz == 0) { |
| 417 | return; |
| 418 | } |
| 419 | |
| 420 | stitch_byte_at = |
| 421 | BITS_TO_BYTES_FLOOR(stitch_at_from_addr(bfcr)); |
| 422 | buf_byte_at = BITS_TO_BYTES_FLOOR(buf_at_from_addr(bfcr)); |
| 423 | nb_bytes = BITS_TO_BYTES_CEIL(sz); |
| 424 | BT_ASSERT(nb_bytes > 0); |
| 425 | BT_ASSERT(bfcr->buf.addr); |
| 426 | memcpy(&bfcr->stitch.buf[stitch_byte_at], &bfcr->buf.addr[buf_byte_at], |
| 427 | nb_bytes); |
| 428 | bfcr->stitch.at += sz; |
| 429 | consume_bits(bfcr, sz); |
| 430 | } |
| 431 | |
| 432 | static |
| 433 | void stitch_append_from_remaining_buf(struct bt_bfcr *bfcr) |
| 434 | { |
| 435 | stitch_append_from_buf(bfcr, available_bits(bfcr)); |
| 436 | } |
| 437 | |
| 438 | static |
| 439 | void stitch_set_from_remaining_buf(struct bt_bfcr *bfcr) |
| 440 | { |
| 441 | stitch_reset(bfcr); |
| 442 | bfcr->stitch.offset = IN_BYTE_OFFSET(buf_at_from_addr(bfcr)); |
| 443 | stitch_append_from_remaining_buf(bfcr); |
| 444 | } |
| 445 | |
| 446 | static inline |
| 447 | void read_unsigned_bitfield(const uint8_t *buf, size_t at, |
| 448 | unsigned int field_size, enum ctf_byte_order bo, |
| 449 | uint64_t *v) |
| 450 | { |
| 451 | switch (bo) { |
| 452 | case CTF_BYTE_ORDER_BIG: |
| 453 | bt_bitfield_read_be(buf, uint8_t, at, field_size, v); |
| 454 | break; |
| 455 | case CTF_BYTE_ORDER_LITTLE: |
| 456 | bt_bitfield_read_le(buf, uint8_t, at, field_size, v); |
| 457 | break; |
| 458 | default: |
| 459 | abort(); |
| 460 | } |
| 461 | |
| 462 | BT_LOGV("Read unsigned bit array: cur=%zu, size=%u, " |
| 463 | "bo=%d, val=%" PRIu64, at, field_size, bo, *v); |
| 464 | } |
| 465 | |
| 466 | static inline |
| 467 | void read_signed_bitfield(const uint8_t *buf, size_t at, |
| 468 | unsigned int field_size, enum ctf_byte_order bo, int64_t *v) |
| 469 | { |
| 470 | switch (bo) { |
| 471 | case CTF_BYTE_ORDER_BIG: |
| 472 | bt_bitfield_read_be(buf, uint8_t, at, field_size, v); |
| 473 | break; |
| 474 | case CTF_BYTE_ORDER_LITTLE: |
| 475 | bt_bitfield_read_le(buf, uint8_t, at, field_size, v); |
| 476 | break; |
| 477 | default: |
| 478 | abort(); |
| 479 | } |
| 480 | |
| 481 | BT_LOGV("Read signed bit array: cur=%zu, size=%u, " |
| 482 | "bo=%d, val=%" PRId64, at, field_size, bo, *v); |
| 483 | } |
| 484 | |
| 485 | typedef enum bt_bfcr_status (* read_basic_and_call_cb_t)(struct bt_bfcr *, |
| 486 | const uint8_t *, size_t); |
| 487 | |
| 488 | static inline |
| 489 | enum bt_bfcr_status validate_contiguous_bo(struct bt_bfcr *bfcr, |
| 490 | enum ctf_byte_order next_bo) |
| 491 | { |
| 492 | enum bt_bfcr_status status = BT_BFCR_STATUS_OK; |
| 493 | |
| 494 | /* Always valid when at a byte boundary */ |
| 495 | if (packet_at(bfcr) % 8 == 0) { |
| 496 | goto end; |
| 497 | } |
| 498 | |
| 499 | /* Always valid if last byte order is unknown */ |
| 500 | if (bfcr->last_bo == -1) { |
| 501 | goto end; |
| 502 | } |
| 503 | |
| 504 | /* Always valid if next byte order is unknown */ |
| 505 | if (next_bo == -1) { |
| 506 | goto end; |
| 507 | } |
| 508 | |
| 509 | /* Make sure last byte order is compatible with the next byte order */ |
| 510 | switch (bfcr->last_bo) { |
| 511 | case CTF_BYTE_ORDER_BIG: |
| 512 | if (next_bo != CTF_BYTE_ORDER_BIG) { |
| 513 | status = BT_BFCR_STATUS_ERROR; |
| 514 | } |
| 515 | break; |
| 516 | case CTF_BYTE_ORDER_LITTLE: |
| 517 | if (next_bo != CTF_BYTE_ORDER_LITTLE) { |
| 518 | status = BT_BFCR_STATUS_ERROR; |
| 519 | } |
| 520 | break; |
| 521 | default: |
| 522 | status = BT_BFCR_STATUS_ERROR; |
| 523 | } |
| 524 | |
| 525 | end: |
| 526 | if (status < 0) { |
| 527 | BT_LOGW("Cannot read bit array: two different byte orders not at a byte boundary: " |
| 528 | "bfcr-addr=%p, last-bo=%d, next-bo=%d", |
| 529 | bfcr, bfcr->last_bo, next_bo); |
| 530 | } |
| 531 | |
| 532 | return status; |
| 533 | } |
| 534 | |
| 535 | static |
| 536 | enum bt_bfcr_status read_basic_float_and_call_cb(struct bt_bfcr *bfcr, |
| 537 | const uint8_t *buf, size_t at) |
| 538 | { |
| 539 | double dblval; |
| 540 | unsigned int field_size; |
| 541 | enum ctf_byte_order bo; |
| 542 | enum bt_bfcr_status status = BT_BFCR_STATUS_OK; |
| 543 | struct ctf_field_class_float *fc = (void *) bfcr->cur_basic_field_class; |
| 544 | |
| 545 | BT_ASSERT(fc); |
| 546 | field_size = fc->base.size; |
| 547 | bo = fc->base.byte_order; |
| 548 | bfcr->cur_bo = bo; |
| 549 | |
| 550 | switch (field_size) { |
| 551 | case 32: |
| 552 | { |
| 553 | uint64_t v; |
| 554 | union { |
| 555 | uint32_t u; |
| 556 | float f; |
| 557 | } f32; |
| 558 | |
| 559 | read_unsigned_bitfield(buf, at, field_size, bo, &v); |
| 560 | f32.u = (uint32_t) v; |
| 561 | dblval = (double) f32.f; |
| 562 | break; |
| 563 | } |
| 564 | case 64: |
| 565 | { |
| 566 | union { |
| 567 | uint64_t u; |
| 568 | double d; |
| 569 | } f64; |
| 570 | |
| 571 | read_unsigned_bitfield(buf, at, field_size, bo, &f64.u); |
| 572 | dblval = f64.d; |
| 573 | break; |
| 574 | } |
| 575 | default: |
| 576 | /* Only 32-bit and 64-bit fields are supported currently */ |
| 577 | abort(); |
| 578 | } |
| 579 | |
| 580 | BT_LOGV("Read floating point number value: bfcr=%p, cur=%zu, val=%f", |
| 581 | bfcr, at, dblval); |
| 582 | |
| 583 | if (bfcr->user.cbs.classes.floating_point) { |
| 584 | BT_LOGV("Calling user function (floating point number)."); |
| 585 | status = bfcr->user.cbs.classes.floating_point(dblval, |
| 586 | bfcr->cur_basic_field_class, bfcr->user.data); |
| 587 | BT_LOGV("User function returned: status=%s", |
| 588 | bt_bfcr_status_string(status)); |
| 589 | if (status != BT_BFCR_STATUS_OK) { |
| 590 | BT_LOGW("User function failed: bfcr-addr=%p, status=%s", |
| 591 | bfcr, bt_bfcr_status_string(status)); |
| 592 | } |
| 593 | } |
| 594 | |
| 595 | return status; |
| 596 | } |
| 597 | |
| 598 | static inline |
| 599 | enum bt_bfcr_status read_basic_int_and_call_cb(struct bt_bfcr *bfcr, |
| 600 | const uint8_t *buf, size_t at) |
| 601 | { |
| 602 | unsigned int field_size; |
| 603 | enum ctf_byte_order bo; |
| 604 | enum bt_bfcr_status status = BT_BFCR_STATUS_OK; |
| 605 | struct ctf_field_class_int *fc = (void *) bfcr->cur_basic_field_class; |
| 606 | |
| 607 | field_size = fc->base.size; |
| 608 | bo = fc->base.byte_order; |
| 609 | |
| 610 | /* |
| 611 | * Update current byte order now because we could be reading |
| 612 | * the integer value of an enumeration class, and thus we know |
| 613 | * here the actual supporting integer class's byte order. |
| 614 | */ |
| 615 | bfcr->cur_bo = bo; |
| 616 | |
| 617 | if (fc->is_signed) { |
| 618 | int64_t v; |
| 619 | |
| 620 | read_signed_bitfield(buf, at, field_size, bo, &v); |
| 621 | |
| 622 | if (bfcr->user.cbs.classes.signed_int) { |
| 623 | BT_LOGV("Calling user function (signed integer)."); |
| 624 | status = bfcr->user.cbs.classes.signed_int(v, |
| 625 | bfcr->cur_basic_field_class, bfcr->user.data); |
| 626 | BT_LOGV("User function returned: status=%s", |
| 627 | bt_bfcr_status_string(status)); |
| 628 | if (status != BT_BFCR_STATUS_OK) { |
| 629 | BT_LOGW("User function failed: " |
| 630 | "bfcr-addr=%p, status=%s", |
| 631 | bfcr, bt_bfcr_status_string(status)); |
| 632 | } |
| 633 | } |
| 634 | } else { |
| 635 | uint64_t v; |
| 636 | |
| 637 | read_unsigned_bitfield(buf, at, field_size, bo, &v); |
| 638 | |
| 639 | if (bfcr->user.cbs.classes.unsigned_int) { |
| 640 | BT_LOGV("Calling user function (unsigned integer)."); |
| 641 | status = bfcr->user.cbs.classes.unsigned_int(v, |
| 642 | bfcr->cur_basic_field_class, bfcr->user.data); |
| 643 | BT_LOGV("User function returned: status=%s", |
| 644 | bt_bfcr_status_string(status)); |
| 645 | if (status != BT_BFCR_STATUS_OK) { |
| 646 | BT_LOGW("User function failed: " |
| 647 | "bfcr-addr=%p, status=%s", |
| 648 | bfcr, bt_bfcr_status_string(status)); |
| 649 | } |
| 650 | } |
| 651 | } |
| 652 | |
| 653 | return status; |
| 654 | } |
| 655 | |
| 656 | static inline |
| 657 | enum bt_bfcr_status read_bit_array_class_and_call_continue(struct bt_bfcr *bfcr, |
| 658 | read_basic_and_call_cb_t read_basic_and_call_cb) |
| 659 | { |
| 660 | size_t available; |
| 661 | size_t needed_bits; |
| 662 | enum bt_bfcr_status status = BT_BFCR_STATUS_OK; |
| 663 | struct ctf_field_class_bit_array *fc = |
| 664 | (void *) bfcr->cur_basic_field_class; |
| 665 | |
| 666 | if (!at_least_one_bit_left(bfcr)) { |
| 667 | BT_LOGV("Reached end of data: bfcr-addr=%p", bfcr); |
| 668 | status = BT_BFCR_STATUS_EOF; |
| 669 | goto end; |
| 670 | } |
| 671 | |
| 672 | available = available_bits(bfcr); |
| 673 | needed_bits = fc->size - bfcr->stitch.at; |
| 674 | BT_LOGV("Continuing basic field decoding: " |
| 675 | "bfcr-addr=%p, field-size=%u, needed-size=%" PRId64 ", " |
| 676 | "available-size=%zu", |
| 677 | bfcr, fc->size, needed_bits, available); |
| 678 | if (needed_bits <= available) { |
| 679 | /* We have all the bits; append to stitch, then decode */ |
| 680 | stitch_append_from_buf(bfcr, needed_bits); |
| 681 | status = read_basic_and_call_cb(bfcr, bfcr->stitch.buf, |
| 682 | bfcr->stitch.offset); |
| 683 | if (status != BT_BFCR_STATUS_OK) { |
| 684 | BT_LOGW("Cannot read basic field: " |
| 685 | "bfcr-addr=%p, fc-addr=%p, status=%s", |
| 686 | bfcr, bfcr->cur_basic_field_class, |
| 687 | bt_bfcr_status_string(status)); |
| 688 | goto end; |
| 689 | } |
| 690 | |
| 691 | if (stack_empty(bfcr->stack)) { |
| 692 | /* Root is a basic class */ |
| 693 | bfcr->state = BFCR_STATE_DONE; |
| 694 | } else { |
| 695 | /* Go to next field */ |
| 696 | stack_top(bfcr->stack)->index++; |
| 697 | bfcr->state = BFCR_STATE_NEXT_FIELD; |
| 698 | bfcr->last_bo = bfcr->cur_bo; |
| 699 | } |
| 700 | goto end; |
| 701 | } |
| 702 | |
| 703 | /* We are here; it means we don't have enough data to decode this */ |
| 704 | BT_LOGV_STR("Not enough data to read the next basic field: appending to stitch buffer."); |
| 705 | stitch_append_from_remaining_buf(bfcr); |
| 706 | status = BT_BFCR_STATUS_EOF; |
| 707 | |
| 708 | end: |
| 709 | return status; |
| 710 | } |
| 711 | |
| 712 | static inline |
| 713 | enum bt_bfcr_status read_bit_array_class_and_call_begin(struct bt_bfcr *bfcr, |
| 714 | read_basic_and_call_cb_t read_basic_and_call_cb) |
| 715 | { |
| 716 | size_t available; |
| 717 | enum bt_bfcr_status status = BT_BFCR_STATUS_OK; |
| 718 | struct ctf_field_class_bit_array *fc = |
| 719 | (void *) bfcr->cur_basic_field_class; |
| 720 | |
| 721 | if (!at_least_one_bit_left(bfcr)) { |
| 722 | BT_LOGV("Reached end of data: bfcr-addr=%p", bfcr); |
| 723 | status = BT_BFCR_STATUS_EOF; |
| 724 | goto end; |
| 725 | } |
| 726 | |
| 727 | status = validate_contiguous_bo(bfcr, fc->byte_order); |
| 728 | if (status != BT_BFCR_STATUS_OK) { |
| 729 | /* validate_contiguous_bo() logs errors */ |
| 730 | goto end; |
| 731 | } |
| 732 | |
| 733 | available = available_bits(bfcr); |
| 734 | |
| 735 | if (fc->size <= available) { |
| 736 | /* We have all the bits; decode and set now */ |
| 737 | BT_ASSERT(bfcr->buf.addr); |
| 738 | status = read_basic_and_call_cb(bfcr, bfcr->buf.addr, |
| 739 | buf_at_from_addr(bfcr)); |
| 740 | if (status != BT_BFCR_STATUS_OK) { |
| 741 | BT_LOGW("Cannot read basic field: " |
| 742 | "bfcr-addr=%p, fc-addr=%p, status=%s", |
| 743 | bfcr, bfcr->cur_basic_field_class, |
| 744 | bt_bfcr_status_string(status)); |
| 745 | goto end; |
| 746 | } |
| 747 | |
| 748 | consume_bits(bfcr, fc->size); |
| 749 | |
| 750 | if (stack_empty(bfcr->stack)) { |
| 751 | /* Root is a basic class */ |
| 752 | bfcr->state = BFCR_STATE_DONE; |
| 753 | } else { |
| 754 | /* Go to next field */ |
| 755 | stack_top(bfcr->stack)->index++; |
| 756 | bfcr->state = BFCR_STATE_NEXT_FIELD; |
| 757 | bfcr->last_bo = bfcr->cur_bo; |
| 758 | } |
| 759 | |
| 760 | goto end; |
| 761 | } |
| 762 | |
| 763 | /* We are here; it means we don't have enough data to decode this */ |
| 764 | BT_LOGV_STR("Not enough data to read the next basic field: setting stitch buffer."); |
| 765 | stitch_set_from_remaining_buf(bfcr); |
| 766 | bfcr->state = BFCR_STATE_READ_BASIC_CONTINUE; |
| 767 | status = BT_BFCR_STATUS_EOF; |
| 768 | |
| 769 | end: |
| 770 | return status; |
| 771 | } |
| 772 | |
| 773 | static inline |
| 774 | enum bt_bfcr_status read_basic_int_class_and_call_begin( |
| 775 | struct bt_bfcr *bfcr) |
| 776 | { |
| 777 | return read_bit_array_class_and_call_begin(bfcr, read_basic_int_and_call_cb); |
| 778 | } |
| 779 | |
| 780 | static inline |
| 781 | enum bt_bfcr_status read_basic_int_class_and_call_continue( |
| 782 | struct bt_bfcr *bfcr) |
| 783 | { |
| 784 | return read_bit_array_class_and_call_continue(bfcr, |
| 785 | read_basic_int_and_call_cb); |
| 786 | } |
| 787 | |
| 788 | static inline |
| 789 | enum bt_bfcr_status read_basic_float_class_and_call_begin( |
| 790 | struct bt_bfcr *bfcr) |
| 791 | { |
| 792 | return read_bit_array_class_and_call_begin(bfcr, |
| 793 | read_basic_float_and_call_cb); |
| 794 | } |
| 795 | |
| 796 | static inline |
| 797 | enum bt_bfcr_status read_basic_float_class_and_call_continue( |
| 798 | struct bt_bfcr *bfcr) |
| 799 | { |
| 800 | return read_bit_array_class_and_call_continue(bfcr, |
| 801 | read_basic_float_and_call_cb); |
| 802 | } |
| 803 | |
| 804 | static inline |
| 805 | enum bt_bfcr_status read_basic_string_class_and_call( |
| 806 | struct bt_bfcr *bfcr, bool begin) |
| 807 | { |
| 808 | size_t buf_at_bytes; |
| 809 | const uint8_t *result; |
| 810 | size_t available_bytes; |
| 811 | const uint8_t *first_chr; |
| 812 | enum bt_bfcr_status status = BT_BFCR_STATUS_OK; |
| 813 | |
| 814 | if (!at_least_one_bit_left(bfcr)) { |
| 815 | BT_LOGV("Reached end of data: bfcr-addr=%p", bfcr); |
| 816 | status = BT_BFCR_STATUS_EOF; |
| 817 | goto end; |
| 818 | } |
| 819 | |
| 820 | BT_ASSERT(buf_at_from_addr(bfcr) % 8 == 0); |
| 821 | available_bytes = BITS_TO_BYTES_FLOOR(available_bits(bfcr)); |
| 822 | buf_at_bytes = BITS_TO_BYTES_FLOOR(buf_at_from_addr(bfcr)); |
| 823 | BT_ASSERT(bfcr->buf.addr); |
| 824 | first_chr = &bfcr->buf.addr[buf_at_bytes]; |
| 825 | result = memchr(first_chr, '\0', available_bytes); |
| 826 | |
| 827 | if (begin && bfcr->user.cbs.classes.string_begin) { |
| 828 | BT_LOGV("Calling user function (string, beginning)."); |
| 829 | status = bfcr->user.cbs.classes.string_begin( |
| 830 | bfcr->cur_basic_field_class, bfcr->user.data); |
| 831 | BT_LOGV("User function returned: status=%s", |
| 832 | bt_bfcr_status_string(status)); |
| 833 | if (status != BT_BFCR_STATUS_OK) { |
| 834 | BT_LOGW("User function failed: bfcr-addr=%p, status=%s", |
| 835 | bfcr, bt_bfcr_status_string(status)); |
| 836 | goto end; |
| 837 | } |
| 838 | } |
| 839 | |
| 840 | if (!result) { |
| 841 | /* No null character yet */ |
| 842 | if (bfcr->user.cbs.classes.string) { |
| 843 | BT_LOGV("Calling user function (substring)."); |
| 844 | status = bfcr->user.cbs.classes.string( |
| 845 | (const char *) first_chr, |
| 846 | available_bytes, bfcr->cur_basic_field_class, |
| 847 | bfcr->user.data); |
| 848 | BT_LOGV("User function returned: status=%s", |
| 849 | bt_bfcr_status_string(status)); |
| 850 | if (status != BT_BFCR_STATUS_OK) { |
| 851 | BT_LOGW("User function failed: " |
| 852 | "bfcr-addr=%p, status=%s", |
| 853 | bfcr, bt_bfcr_status_string(status)); |
| 854 | goto end; |
| 855 | } |
| 856 | } |
| 857 | |
| 858 | consume_bits(bfcr, BYTES_TO_BITS(available_bytes)); |
| 859 | bfcr->state = BFCR_STATE_READ_BASIC_CONTINUE; |
| 860 | status = BT_BFCR_STATUS_EOF; |
| 861 | } else { |
| 862 | /* Found the null character */ |
| 863 | size_t result_len = (size_t) (result - first_chr); |
| 864 | |
| 865 | if (bfcr->user.cbs.classes.string && result_len) { |
| 866 | BT_LOGV("Calling user function (substring)."); |
| 867 | status = bfcr->user.cbs.classes.string( |
| 868 | (const char *) first_chr, |
| 869 | result_len, bfcr->cur_basic_field_class, |
| 870 | bfcr->user.data); |
| 871 | BT_LOGV("User function returned: status=%s", |
| 872 | bt_bfcr_status_string(status)); |
| 873 | if (status != BT_BFCR_STATUS_OK) { |
| 874 | BT_LOGW("User function failed: " |
| 875 | "bfcr-addr=%p, status=%s", |
| 876 | bfcr, bt_bfcr_status_string(status)); |
| 877 | goto end; |
| 878 | } |
| 879 | } |
| 880 | |
| 881 | if (bfcr->user.cbs.classes.string_end) { |
| 882 | BT_LOGV("Calling user function (string, end)."); |
| 883 | status = bfcr->user.cbs.classes.string_end( |
| 884 | bfcr->cur_basic_field_class, bfcr->user.data); |
| 885 | BT_LOGV("User function returned: status=%s", |
| 886 | bt_bfcr_status_string(status)); |
| 887 | if (status != BT_BFCR_STATUS_OK) { |
| 888 | BT_LOGW("User function failed: " |
| 889 | "bfcr-addr=%p, status=%s", |
| 890 | bfcr, bt_bfcr_status_string(status)); |
| 891 | goto end; |
| 892 | } |
| 893 | } |
| 894 | |
| 895 | consume_bits(bfcr, BYTES_TO_BITS(result_len + 1)); |
| 896 | |
| 897 | if (stack_empty(bfcr->stack)) { |
| 898 | /* Root is a basic class */ |
| 899 | bfcr->state = BFCR_STATE_DONE; |
| 900 | } else { |
| 901 | /* Go to next field */ |
| 902 | stack_top(bfcr->stack)->index++; |
| 903 | bfcr->state = BFCR_STATE_NEXT_FIELD; |
| 904 | bfcr->last_bo = bfcr->cur_bo; |
| 905 | } |
| 906 | } |
| 907 | |
| 908 | end: |
| 909 | return status; |
| 910 | } |
| 911 | |
| 912 | static inline |
| 913 | enum bt_bfcr_status read_basic_begin_state(struct bt_bfcr *bfcr) |
| 914 | { |
| 915 | enum bt_bfcr_status status; |
| 916 | |
| 917 | BT_ASSERT(bfcr->cur_basic_field_class); |
| 918 | |
| 919 | switch (bfcr->cur_basic_field_class->type) { |
| 920 | case CTF_FIELD_CLASS_TYPE_INT: |
| 921 | case CTF_FIELD_CLASS_TYPE_ENUM: |
| 922 | status = read_basic_int_class_and_call_begin(bfcr); |
| 923 | break; |
| 924 | case CTF_FIELD_CLASS_TYPE_FLOAT: |
| 925 | status = read_basic_float_class_and_call_begin(bfcr); |
| 926 | break; |
| 927 | case CTF_FIELD_CLASS_TYPE_STRING: |
| 928 | status = read_basic_string_class_and_call(bfcr, true); |
| 929 | break; |
| 930 | default: |
| 931 | abort(); |
| 932 | } |
| 933 | |
| 934 | return status; |
| 935 | } |
| 936 | |
| 937 | static inline |
| 938 | enum bt_bfcr_status read_basic_continue_state(struct bt_bfcr *bfcr) |
| 939 | { |
| 940 | enum bt_bfcr_status status; |
| 941 | |
| 942 | BT_ASSERT(bfcr->cur_basic_field_class); |
| 943 | |
| 944 | switch (bfcr->cur_basic_field_class->type) { |
| 945 | case CTF_FIELD_CLASS_TYPE_INT: |
| 946 | case CTF_FIELD_CLASS_TYPE_ENUM: |
| 947 | status = read_basic_int_class_and_call_continue(bfcr); |
| 948 | break; |
| 949 | case CTF_FIELD_CLASS_TYPE_FLOAT: |
| 950 | status = read_basic_float_class_and_call_continue(bfcr); |
| 951 | break; |
| 952 | case CTF_FIELD_CLASS_TYPE_STRING: |
| 953 | status = read_basic_string_class_and_call(bfcr, false); |
| 954 | break; |
| 955 | default: |
| 956 | abort(); |
| 957 | } |
| 958 | |
| 959 | return status; |
| 960 | } |
| 961 | |
| 962 | static inline |
| 963 | size_t bits_to_skip_to_align_to(struct bt_bfcr *bfcr, size_t align) |
| 964 | { |
| 965 | size_t aligned_packet_at; |
| 966 | |
| 967 | aligned_packet_at = ALIGN(packet_at(bfcr), align); |
| 968 | return aligned_packet_at - packet_at(bfcr); |
| 969 | } |
| 970 | |
| 971 | static inline |
| 972 | enum bt_bfcr_status align_class_state(struct bt_bfcr *bfcr, |
| 973 | struct ctf_field_class *field_class, enum bfcr_state next_state) |
| 974 | { |
| 975 | unsigned int field_alignment; |
| 976 | size_t skip_bits; |
| 977 | enum bt_bfcr_status status = BT_BFCR_STATUS_OK; |
| 978 | |
| 979 | /* Get field's alignment */ |
| 980 | field_alignment = field_class->alignment; |
| 981 | |
| 982 | /* |
| 983 | * 0 means "undefined" for variants; what we really want is 1 |
| 984 | * (always aligned) |
| 985 | */ |
| 986 | BT_ASSERT(field_alignment >= 1); |
| 987 | |
| 988 | /* Compute how many bits we need to skip */ |
| 989 | skip_bits = bits_to_skip_to_align_to(bfcr, (size_t) field_alignment); |
| 990 | |
| 991 | /* Nothing to skip? aligned */ |
| 992 | if (skip_bits == 0) { |
| 993 | bfcr->state = next_state; |
| 994 | goto end; |
| 995 | } |
| 996 | |
| 997 | /* Make sure there's at least one bit left */ |
| 998 | if (!at_least_one_bit_left(bfcr)) { |
| 999 | status = BT_BFCR_STATUS_EOF; |
| 1000 | goto end; |
| 1001 | } |
| 1002 | |
| 1003 | /* Consume as many bits as possible in what's left */ |
| 1004 | consume_bits(bfcr, MIN(available_bits(bfcr), skip_bits)); |
| 1005 | |
| 1006 | /* Are we done now? */ |
| 1007 | skip_bits = bits_to_skip_to_align_to(bfcr, field_alignment); |
| 1008 | if (skip_bits == 0) { |
| 1009 | /* Yes: go to next state */ |
| 1010 | bfcr->state = next_state; |
| 1011 | goto end; |
| 1012 | } else { |
| 1013 | /* No: need more data */ |
| 1014 | BT_LOGV("Reached end of data when aligning: bfcr-addr=%p", bfcr); |
| 1015 | status = BT_BFCR_STATUS_EOF; |
| 1016 | } |
| 1017 | |
| 1018 | end: |
| 1019 | return status; |
| 1020 | } |
| 1021 | |
| 1022 | static inline |
| 1023 | enum bt_bfcr_status next_field_state(struct bt_bfcr *bfcr) |
| 1024 | { |
| 1025 | int ret; |
| 1026 | struct stack_entry *top; |
| 1027 | struct ctf_field_class *next_field_class = NULL; |
| 1028 | enum bt_bfcr_status status = BT_BFCR_STATUS_OK; |
| 1029 | |
| 1030 | if (stack_empty(bfcr->stack)) { |
| 1031 | goto end; |
| 1032 | } |
| 1033 | |
| 1034 | top = stack_top(bfcr->stack); |
| 1035 | |
| 1036 | /* Are we done with this base class? */ |
| 1037 | while (top->index == top->base_len) { |
| 1038 | if (bfcr->user.cbs.classes.compound_end) { |
| 1039 | BT_LOGV("Calling user function (compound, end)."); |
| 1040 | status = bfcr->user.cbs.classes.compound_end( |
| 1041 | top->base_class, bfcr->user.data); |
| 1042 | BT_LOGV("User function returned: status=%s", |
| 1043 | bt_bfcr_status_string(status)); |
| 1044 | if (status != BT_BFCR_STATUS_OK) { |
| 1045 | BT_LOGW("User function failed: bfcr-addr=%p, status=%s", |
| 1046 | bfcr, bt_bfcr_status_string(status)); |
| 1047 | goto end; |
| 1048 | } |
| 1049 | } |
| 1050 | |
| 1051 | stack_pop(bfcr->stack); |
| 1052 | |
| 1053 | /* Are we done with the root class? */ |
| 1054 | if (stack_empty(bfcr->stack)) { |
| 1055 | bfcr->state = BFCR_STATE_DONE; |
| 1056 | goto end; |
| 1057 | } |
| 1058 | |
| 1059 | top = stack_top(bfcr->stack); |
| 1060 | top->index++; |
| 1061 | } |
| 1062 | |
| 1063 | /* Get next field's class */ |
| 1064 | switch (top->base_class->type) { |
| 1065 | case CTF_FIELD_CLASS_TYPE_STRUCT: |
| 1066 | next_field_class = ctf_field_class_struct_borrow_member_by_index( |
| 1067 | (void *) top->base_class, (uint64_t) top->index)->fc; |
| 1068 | break; |
| 1069 | case CTF_FIELD_CLASS_TYPE_ARRAY: |
| 1070 | case CTF_FIELD_CLASS_TYPE_SEQUENCE: |
| 1071 | { |
| 1072 | struct ctf_field_class_array_base *array_fc = |
| 1073 | (void *) top->base_class; |
| 1074 | |
| 1075 | next_field_class = array_fc->elem_fc; |
| 1076 | break; |
| 1077 | } |
| 1078 | case CTF_FIELD_CLASS_TYPE_VARIANT: |
| 1079 | /* Variant classes are dynamic: the user should know! */ |
| 1080 | next_field_class = |
| 1081 | bfcr->user.cbs.query.borrow_variant_selected_field_class( |
| 1082 | top->base_class, bfcr->user.data); |
| 1083 | break; |
| 1084 | default: |
| 1085 | break; |
| 1086 | } |
| 1087 | |
| 1088 | if (!next_field_class) { |
| 1089 | BT_LOGW("Cannot get the field class of the next field: " |
| 1090 | "bfcr-addr=%p, base-fc-addr=%p, base-fc-type=%d, " |
| 1091 | "index=%" PRId64, |
| 1092 | bfcr, top->base_class, top->base_class->type, |
| 1093 | top->index); |
| 1094 | status = BT_BFCR_STATUS_ERROR; |
| 1095 | goto end; |
| 1096 | } |
| 1097 | |
| 1098 | if (next_field_class->is_compound) { |
| 1099 | if (bfcr->user.cbs.classes.compound_begin) { |
| 1100 | BT_LOGV("Calling user function (compound, begin)."); |
| 1101 | status = bfcr->user.cbs.classes.compound_begin( |
| 1102 | next_field_class, bfcr->user.data); |
| 1103 | BT_LOGV("User function returned: status=%s", |
| 1104 | bt_bfcr_status_string(status)); |
| 1105 | if (status != BT_BFCR_STATUS_OK) { |
| 1106 | BT_LOGW("User function failed: bfcr-addr=%p, status=%s", |
| 1107 | bfcr, bt_bfcr_status_string(status)); |
| 1108 | goto end; |
| 1109 | } |
| 1110 | } |
| 1111 | |
| 1112 | ret = stack_push_with_len(bfcr, next_field_class); |
| 1113 | if (ret) { |
| 1114 | /* stack_push_with_len() logs errors */ |
| 1115 | status = BT_BFCR_STATUS_ERROR; |
| 1116 | goto end; |
| 1117 | } |
| 1118 | |
| 1119 | /* Next state: align a compound class */ |
| 1120 | bfcr->state = BFCR_STATE_ALIGN_COMPOUND; |
| 1121 | } else { |
| 1122 | /* Replace current basic field class */ |
| 1123 | BT_LOGV("Replacing current basic field class: " |
| 1124 | "bfcr-addr=%p, cur-basic-fc-addr=%p, " |
| 1125 | "next-basic-fc-addr=%p", |
| 1126 | bfcr, bfcr->cur_basic_field_class, next_field_class); |
| 1127 | bfcr->cur_basic_field_class = next_field_class; |
| 1128 | |
| 1129 | /* Next state: align a basic class */ |
| 1130 | bfcr->state = BFCR_STATE_ALIGN_BASIC; |
| 1131 | } |
| 1132 | |
| 1133 | end: |
| 1134 | return status; |
| 1135 | } |
| 1136 | |
| 1137 | static inline |
| 1138 | enum bt_bfcr_status handle_state(struct bt_bfcr *bfcr) |
| 1139 | { |
| 1140 | enum bt_bfcr_status status = BT_BFCR_STATUS_OK; |
| 1141 | |
| 1142 | BT_LOGV("Handling state: bfcr-addr=%p, state=%s", |
| 1143 | bfcr, bfcr_state_string(bfcr->state)); |
| 1144 | |
| 1145 | switch (bfcr->state) { |
| 1146 | case BFCR_STATE_NEXT_FIELD: |
| 1147 | status = next_field_state(bfcr); |
| 1148 | break; |
| 1149 | case BFCR_STATE_ALIGN_BASIC: |
| 1150 | status = align_class_state(bfcr, bfcr->cur_basic_field_class, |
| 1151 | BFCR_STATE_READ_BASIC_BEGIN); |
| 1152 | break; |
| 1153 | case BFCR_STATE_ALIGN_COMPOUND: |
| 1154 | status = align_class_state(bfcr, stack_top(bfcr->stack)->base_class, |
| 1155 | BFCR_STATE_NEXT_FIELD); |
| 1156 | break; |
| 1157 | case BFCR_STATE_READ_BASIC_BEGIN: |
| 1158 | status = read_basic_begin_state(bfcr); |
| 1159 | break; |
| 1160 | case BFCR_STATE_READ_BASIC_CONTINUE: |
| 1161 | status = read_basic_continue_state(bfcr); |
| 1162 | break; |
| 1163 | case BFCR_STATE_DONE: |
| 1164 | break; |
| 1165 | } |
| 1166 | |
| 1167 | BT_LOGV("Handled state: bfcr-addr=%p, status=%s", |
| 1168 | bfcr, bt_bfcr_status_string(status)); |
| 1169 | return status; |
| 1170 | } |
| 1171 | |
| 1172 | BT_HIDDEN |
| 1173 | struct bt_bfcr *bt_bfcr_create(struct bt_bfcr_cbs cbs, void *data) |
| 1174 | { |
| 1175 | struct bt_bfcr *bfcr; |
| 1176 | |
| 1177 | BT_LOGD_STR("Creating binary class reader (BFCR)."); |
| 1178 | bfcr = g_new0(struct bt_bfcr, 1); |
| 1179 | if (!bfcr) { |
| 1180 | BT_LOGE_STR("Failed to allocate one binary class reader."); |
| 1181 | goto end; |
| 1182 | } |
| 1183 | |
| 1184 | bfcr->stack = stack_new(); |
| 1185 | if (!bfcr->stack) { |
| 1186 | BT_LOGE_STR("Cannot create BFCR's stack."); |
| 1187 | bt_bfcr_destroy(bfcr); |
| 1188 | bfcr = NULL; |
| 1189 | goto end; |
| 1190 | } |
| 1191 | |
| 1192 | bfcr->state = BFCR_STATE_NEXT_FIELD; |
| 1193 | bfcr->user.cbs = cbs; |
| 1194 | bfcr->user.data = data; |
| 1195 | BT_LOGD("Created BFCR: addr=%p", bfcr); |
| 1196 | |
| 1197 | end: |
| 1198 | return bfcr; |
| 1199 | } |
| 1200 | |
| 1201 | BT_HIDDEN |
| 1202 | void bt_bfcr_destroy(struct bt_bfcr *bfcr) |
| 1203 | { |
| 1204 | if (bfcr->stack) { |
| 1205 | stack_destroy(bfcr->stack); |
| 1206 | } |
| 1207 | |
| 1208 | BT_LOGD("Destroying BFCR: addr=%p", bfcr); |
| 1209 | g_free(bfcr); |
| 1210 | } |
| 1211 | |
| 1212 | static |
| 1213 | void reset(struct bt_bfcr *bfcr) |
| 1214 | { |
| 1215 | BT_LOGD("Resetting BFCR: addr=%p", bfcr); |
| 1216 | stack_clear(bfcr->stack); |
| 1217 | stitch_reset(bfcr); |
| 1218 | bfcr->buf.addr = NULL; |
| 1219 | bfcr->last_bo = -1; |
| 1220 | } |
| 1221 | |
| 1222 | static |
| 1223 | void update_packet_offset(struct bt_bfcr *bfcr) |
| 1224 | { |
| 1225 | BT_LOGV("Updating packet offset for next call: " |
| 1226 | "bfcr-addr=%p, cur-packet-offset=%zu, next-packet-offset=%zu", |
| 1227 | bfcr, bfcr->buf.packet_offset, |
| 1228 | bfcr->buf.packet_offset + bfcr->buf.at); |
| 1229 | bfcr->buf.packet_offset += bfcr->buf.at; |
| 1230 | } |
| 1231 | |
| 1232 | BT_HIDDEN |
| 1233 | size_t bt_bfcr_start(struct bt_bfcr *bfcr, |
| 1234 | struct ctf_field_class *cls, const uint8_t *buf, |
| 1235 | size_t offset, size_t packet_offset, size_t sz, |
| 1236 | enum bt_bfcr_status *status) |
| 1237 | { |
| 1238 | BT_ASSERT(bfcr); |
| 1239 | BT_ASSERT(BYTES_TO_BITS(sz) >= offset); |
| 1240 | reset(bfcr); |
| 1241 | bfcr->buf.addr = buf; |
| 1242 | bfcr->buf.offset = offset; |
| 1243 | bfcr->buf.at = 0; |
| 1244 | bfcr->buf.packet_offset = packet_offset; |
| 1245 | bfcr->buf.buf_sz = sz; |
| 1246 | bfcr->buf.sz = BYTES_TO_BITS(sz) - offset; |
| 1247 | *status = BT_BFCR_STATUS_OK; |
| 1248 | |
| 1249 | BT_LOGV("Starting decoding: bfcr-addr=%p, fc-addr=%p, " |
| 1250 | "buf-addr=%p, buf-size=%zu, offset=%zu, " |
| 1251 | "packet-offset=%zu", |
| 1252 | bfcr, cls, buf, sz, offset, packet_offset); |
| 1253 | |
| 1254 | /* Set root class */ |
| 1255 | if (cls->is_compound) { |
| 1256 | /* Compound class: push on visit stack */ |
| 1257 | int stack_ret; |
| 1258 | |
| 1259 | if (bfcr->user.cbs.classes.compound_begin) { |
| 1260 | BT_LOGV("Calling user function (compound, begin)."); |
| 1261 | *status = bfcr->user.cbs.classes.compound_begin( |
| 1262 | cls, bfcr->user.data); |
| 1263 | BT_LOGV("User function returned: status=%s", |
| 1264 | bt_bfcr_status_string(*status)); |
| 1265 | if (*status != BT_BFCR_STATUS_OK) { |
| 1266 | BT_LOGW("User function failed: bfcr-addr=%p, status=%s", |
| 1267 | bfcr, bt_bfcr_status_string(*status)); |
| 1268 | goto end; |
| 1269 | } |
| 1270 | } |
| 1271 | |
| 1272 | stack_ret = stack_push_with_len(bfcr, cls); |
| 1273 | if (stack_ret) { |
| 1274 | /* stack_push_with_len() logs errors */ |
| 1275 | *status = BT_BFCR_STATUS_ERROR; |
| 1276 | goto end; |
| 1277 | } |
| 1278 | |
| 1279 | bfcr->state = BFCR_STATE_ALIGN_COMPOUND; |
| 1280 | } else { |
| 1281 | /* Basic class: set as current basic class */ |
| 1282 | bfcr->cur_basic_field_class = cls; |
| 1283 | bfcr->state = BFCR_STATE_ALIGN_BASIC; |
| 1284 | } |
| 1285 | |
| 1286 | /* Run the machine! */ |
| 1287 | BT_LOGV_STR("Running the state machine."); |
| 1288 | |
| 1289 | while (true) { |
| 1290 | *status = handle_state(bfcr); |
| 1291 | if (*status != BT_BFCR_STATUS_OK || |
| 1292 | bfcr->state == BFCR_STATE_DONE) { |
| 1293 | break; |
| 1294 | } |
| 1295 | } |
| 1296 | |
| 1297 | /* Update packet offset for next time */ |
| 1298 | update_packet_offset(bfcr); |
| 1299 | |
| 1300 | end: |
| 1301 | return bfcr->buf.at; |
| 1302 | } |
| 1303 | |
| 1304 | BT_HIDDEN |
| 1305 | size_t bt_bfcr_continue(struct bt_bfcr *bfcr, const uint8_t *buf, size_t sz, |
| 1306 | enum bt_bfcr_status *status) |
| 1307 | { |
| 1308 | BT_ASSERT(bfcr); |
| 1309 | BT_ASSERT(buf); |
| 1310 | BT_ASSERT(sz > 0); |
| 1311 | bfcr->buf.addr = buf; |
| 1312 | bfcr->buf.offset = 0; |
| 1313 | bfcr->buf.at = 0; |
| 1314 | bfcr->buf.buf_sz = sz; |
| 1315 | bfcr->buf.sz = BYTES_TO_BITS(sz); |
| 1316 | *status = BT_BFCR_STATUS_OK; |
| 1317 | |
| 1318 | BT_LOGV("Continuing decoding: bfcr-addr=%p, buf-addr=%p, buf-size=%zu", |
| 1319 | bfcr, buf, sz); |
| 1320 | |
| 1321 | /* Continue running the machine */ |
| 1322 | BT_LOGV_STR("Running the state machine."); |
| 1323 | |
| 1324 | while (true) { |
| 1325 | *status = handle_state(bfcr); |
| 1326 | if (*status != BT_BFCR_STATUS_OK || |
| 1327 | bfcr->state == BFCR_STATE_DONE) { |
| 1328 | break; |
| 1329 | } |
| 1330 | } |
| 1331 | |
| 1332 | /* Update packet offset for next time */ |
| 1333 | update_packet_offset(bfcr); |
| 1334 | return bfcr->buf.at; |
| 1335 | } |
| 1336 | |
| 1337 | BT_HIDDEN |
| 1338 | void bt_bfcr_set_unsigned_int_cb(struct bt_bfcr *bfcr, |
| 1339 | bt_bfcr_unsigned_int_cb_func cb) |
| 1340 | { |
| 1341 | BT_ASSERT(bfcr); |
| 1342 | BT_ASSERT(cb); |
| 1343 | bfcr->user.cbs.classes.unsigned_int = cb; |
| 1344 | } |