Mark Salyzyn | bd1ad04 | 2016-02-17 16:08:13 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2016 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include <errno.h> |
| 18 | #include <inttypes.h> |
| 19 | #include <stdbool.h> |
| 20 | #include <stdint.h> |
| 21 | #include <stdio.h> |
| 22 | #include <stdlib.h> |
| 23 | #include <string.h> |
| 24 | |
| 25 | #include <log/log.h> |
| 26 | #include <log/logger.h> |
| 27 | |
Mark Salyzyn | be1d3c2 | 2016-03-10 08:25:33 -0800 | [diff] [blame] | 28 | #include "log_cdefs.h" |
| 29 | |
Mark Salyzyn | bd1ad04 | 2016-02-17 16:08:13 -0800 | [diff] [blame] | 30 | #define MAX_EVENT_PAYLOAD (LOGGER_ENTRY_MAX_PAYLOAD - sizeof(int32_t)) |
| 31 | |
| 32 | typedef struct { |
| 33 | uint32_t tag; |
| 34 | unsigned pos; /* Read/write position into buffer */ |
| 35 | unsigned count[ANDROID_MAX_LIST_NEST_DEPTH + 1]; /* Number of elements */ |
| 36 | unsigned list[ANDROID_MAX_LIST_NEST_DEPTH + 1]; /* pos for list counter */ |
| 37 | unsigned list_nest_depth; |
| 38 | unsigned len; /* Length or raw buffer. */ |
| 39 | bool overflow; |
| 40 | bool list_stop; /* next call decrement list_nest_depth and issue a stop */ |
| 41 | enum { |
| 42 | kAndroidLoggerRead = 1, |
| 43 | kAndroidLoggerWrite = 2, |
| 44 | } read_write_flag; |
| 45 | uint8_t storage[LOGGER_ENTRY_MAX_PAYLOAD]; |
| 46 | } android_log_context_internal; |
| 47 | |
Mark Salyzyn | be1d3c2 | 2016-03-10 08:25:33 -0800 | [diff] [blame] | 48 | LIBLOG_ABI_PUBLIC android_log_context create_android_logger(uint32_t tag) { |
Mark Salyzyn | bd1ad04 | 2016-02-17 16:08:13 -0800 | [diff] [blame] | 49 | size_t needed, i; |
| 50 | android_log_context_internal *context; |
| 51 | |
| 52 | context = calloc(1, sizeof(android_log_context_internal)); |
| 53 | if (!context) { |
| 54 | return NULL; |
| 55 | } |
| 56 | context->tag = tag; |
| 57 | context->read_write_flag = kAndroidLoggerWrite; |
| 58 | needed = sizeof(uint8_t) + sizeof(uint8_t); |
| 59 | if ((context->pos + needed) > MAX_EVENT_PAYLOAD) { |
| 60 | context->overflow = true; |
| 61 | } |
| 62 | /* Everything is a list */ |
| 63 | context->storage[context->pos + 0] = EVENT_TYPE_LIST; |
| 64 | context->list[0] = context->pos + 1; |
| 65 | context->pos += needed; |
| 66 | |
| 67 | return (android_log_context)context; |
| 68 | } |
| 69 | |
Mark Salyzyn | be1d3c2 | 2016-03-10 08:25:33 -0800 | [diff] [blame] | 70 | LIBLOG_ABI_PUBLIC android_log_context create_android_log_parser( |
| 71 | const char *msg, |
| 72 | size_t len) { |
Mark Salyzyn | bd1ad04 | 2016-02-17 16:08:13 -0800 | [diff] [blame] | 73 | android_log_context_internal *context; |
| 74 | size_t i; |
| 75 | |
| 76 | context = calloc(1, sizeof(android_log_context_internal)); |
| 77 | if (!context) { |
| 78 | return NULL; |
| 79 | } |
| 80 | len = (len <= MAX_EVENT_PAYLOAD) ? len : MAX_EVENT_PAYLOAD; |
| 81 | context->len = len; |
| 82 | memcpy(context->storage, msg, len); |
| 83 | context->read_write_flag = kAndroidLoggerRead; |
| 84 | |
| 85 | return (android_log_context)context; |
| 86 | } |
| 87 | |
Mark Salyzyn | be1d3c2 | 2016-03-10 08:25:33 -0800 | [diff] [blame] | 88 | LIBLOG_ABI_PUBLIC int android_log_destroy(android_log_context *ctx) { |
Mark Salyzyn | bd1ad04 | 2016-02-17 16:08:13 -0800 | [diff] [blame] | 89 | android_log_context_internal *context; |
| 90 | |
| 91 | context = (android_log_context_internal *)*ctx; |
| 92 | if (!context) { |
| 93 | return -EBADF; |
| 94 | } |
| 95 | memset(context, 0, sizeof(*context)); |
| 96 | free(context); |
| 97 | *ctx = NULL; |
| 98 | return 0; |
| 99 | } |
| 100 | |
Mark Salyzyn | be1d3c2 | 2016-03-10 08:25:33 -0800 | [diff] [blame] | 101 | LIBLOG_ABI_PUBLIC int android_log_write_list_begin(android_log_context ctx) { |
Mark Salyzyn | bd1ad04 | 2016-02-17 16:08:13 -0800 | [diff] [blame] | 102 | size_t needed; |
| 103 | android_log_context_internal *context; |
| 104 | |
| 105 | context = (android_log_context_internal *)ctx; |
| 106 | if (!context || |
| 107 | (kAndroidLoggerWrite != context->read_write_flag)) { |
| 108 | return -EBADF; |
| 109 | } |
| 110 | if (context->list_nest_depth > ANDROID_MAX_LIST_NEST_DEPTH) { |
| 111 | context->overflow = true; |
| 112 | return -EOVERFLOW; |
| 113 | } |
| 114 | needed = sizeof(uint8_t) + sizeof(uint8_t); |
| 115 | if ((context->pos + needed) > MAX_EVENT_PAYLOAD) { |
| 116 | context->overflow = true; |
| 117 | return -EIO; |
| 118 | } |
| 119 | context->count[context->list_nest_depth]++; |
| 120 | context->list_nest_depth++; |
| 121 | if (context->list_nest_depth > ANDROID_MAX_LIST_NEST_DEPTH) { |
| 122 | context->overflow = true; |
| 123 | return -EOVERFLOW; |
| 124 | } |
| 125 | if (context->overflow) { |
| 126 | return -EIO; |
| 127 | } |
| 128 | context->storage[context->pos + 0] = EVENT_TYPE_LIST; |
| 129 | context->storage[context->pos + 1] = 0; |
| 130 | context->list[context->list_nest_depth] = context->pos + 1; |
| 131 | context->count[context->list_nest_depth] = 0; |
| 132 | context->pos += needed; |
| 133 | return 0; |
| 134 | } |
| 135 | |
| 136 | static inline void copy4LE(uint8_t *buf, uint32_t val) |
| 137 | { |
| 138 | buf[0] = val & 0xFF; |
| 139 | buf[1] = (val >> 8) & 0xFF; |
| 140 | buf[2] = (val >> 16) & 0xFF; |
| 141 | buf[3] = (val >> 24) & 0xFF; |
| 142 | } |
| 143 | |
Mark Salyzyn | be1d3c2 | 2016-03-10 08:25:33 -0800 | [diff] [blame] | 144 | LIBLOG_ABI_PUBLIC int android_log_write_int32(android_log_context ctx, |
| 145 | int32_t value) { |
Mark Salyzyn | bd1ad04 | 2016-02-17 16:08:13 -0800 | [diff] [blame] | 146 | size_t needed; |
| 147 | android_log_context_internal *context; |
| 148 | |
| 149 | context = (android_log_context_internal *)ctx; |
| 150 | if (!context || (kAndroidLoggerWrite != context->read_write_flag)) { |
| 151 | return -EBADF; |
| 152 | } |
| 153 | if (context->overflow) { |
| 154 | return -EIO; |
| 155 | } |
| 156 | needed = sizeof(uint8_t) + sizeof(value); |
| 157 | if ((context->pos + needed) > MAX_EVENT_PAYLOAD) { |
| 158 | context->overflow = true; |
| 159 | return -EIO; |
| 160 | } |
| 161 | context->count[context->list_nest_depth]++; |
| 162 | context->storage[context->pos + 0] = EVENT_TYPE_INT; |
| 163 | copy4LE(&context->storage[context->pos + 1], value); |
| 164 | context->pos += needed; |
| 165 | return 0; |
| 166 | } |
| 167 | |
| 168 | static inline void copy8LE(uint8_t *buf, uint64_t val) |
| 169 | { |
| 170 | buf[0] = val & 0xFF; |
| 171 | buf[1] = (val >> 8) & 0xFF; |
| 172 | buf[2] = (val >> 16) & 0xFF; |
| 173 | buf[3] = (val >> 24) & 0xFF; |
| 174 | buf[4] = (val >> 32) & 0xFF; |
| 175 | buf[5] = (val >> 40) & 0xFF; |
| 176 | buf[6] = (val >> 48) & 0xFF; |
| 177 | buf[7] = (val >> 56) & 0xFF; |
| 178 | } |
| 179 | |
Mark Salyzyn | be1d3c2 | 2016-03-10 08:25:33 -0800 | [diff] [blame] | 180 | LIBLOG_ABI_PUBLIC int android_log_write_int64(android_log_context ctx, |
| 181 | int64_t value) { |
Mark Salyzyn | bd1ad04 | 2016-02-17 16:08:13 -0800 | [diff] [blame] | 182 | size_t needed; |
| 183 | android_log_context_internal *context; |
| 184 | |
| 185 | context = (android_log_context_internal *)ctx; |
| 186 | if (!context || (kAndroidLoggerWrite != context->read_write_flag)) { |
| 187 | return -EBADF; |
| 188 | } |
| 189 | if (context->overflow) { |
| 190 | return -EIO; |
| 191 | } |
| 192 | needed = sizeof(uint8_t) + sizeof(value); |
| 193 | if ((context->pos + needed) > MAX_EVENT_PAYLOAD) { |
| 194 | context->overflow = true; |
| 195 | return -EIO; |
| 196 | } |
| 197 | context->count[context->list_nest_depth]++; |
| 198 | context->storage[context->pos + 0] = EVENT_TYPE_LONG; |
| 199 | copy8LE(&context->storage[context->pos + 1], value); |
| 200 | context->pos += needed; |
| 201 | return 0; |
| 202 | } |
| 203 | |
Mark Salyzyn | be1d3c2 | 2016-03-10 08:25:33 -0800 | [diff] [blame] | 204 | LIBLOG_ABI_PUBLIC int android_log_write_string8_len(android_log_context ctx, |
| 205 | const char *value, |
| 206 | size_t maxlen) { |
Mark Salyzyn | bd1ad04 | 2016-02-17 16:08:13 -0800 | [diff] [blame] | 207 | size_t needed; |
Mark Salyzyn | 67d7eaf | 2016-02-25 08:41:25 -0800 | [diff] [blame] | 208 | ssize_t len; |
Mark Salyzyn | bd1ad04 | 2016-02-17 16:08:13 -0800 | [diff] [blame] | 209 | android_log_context_internal *context; |
| 210 | |
| 211 | context = (android_log_context_internal *)ctx; |
| 212 | if (!context || (kAndroidLoggerWrite != context->read_write_flag)) { |
| 213 | return -EBADF; |
| 214 | } |
| 215 | if (context->overflow) { |
| 216 | return -EIO; |
| 217 | } |
| 218 | if (!value) { |
Mark Salyzyn | 67d7eaf | 2016-02-25 08:41:25 -0800 | [diff] [blame] | 219 | value = ""; |
Mark Salyzyn | bd1ad04 | 2016-02-17 16:08:13 -0800 | [diff] [blame] | 220 | } |
Mark Salyzyn | 67d7eaf | 2016-02-25 08:41:25 -0800 | [diff] [blame] | 221 | len = strnlen(value, maxlen); |
| 222 | needed = sizeof(uint8_t) + sizeof(int32_t) + len; |
Mark Salyzyn | bd1ad04 | 2016-02-17 16:08:13 -0800 | [diff] [blame] | 223 | if ((context->pos + needed) > MAX_EVENT_PAYLOAD) { |
| 224 | /* Truncate string for delivery */ |
Mark Salyzyn | 67d7eaf | 2016-02-25 08:41:25 -0800 | [diff] [blame] | 225 | len = MAX_EVENT_PAYLOAD - context->pos - 1 - sizeof(int32_t); |
Mark Salyzyn | bd1ad04 | 2016-02-17 16:08:13 -0800 | [diff] [blame] | 226 | if (len <= 0) { |
| 227 | context->overflow = true; |
| 228 | return -EIO; |
| 229 | } |
| 230 | } |
| 231 | context->count[context->list_nest_depth]++; |
| 232 | context->storage[context->pos + 0] = EVENT_TYPE_STRING; |
| 233 | copy4LE(&context->storage[context->pos + 1], len); |
Mark Salyzyn | 67d7eaf | 2016-02-25 08:41:25 -0800 | [diff] [blame] | 234 | if (len) { |
| 235 | memcpy(&context->storage[context->pos + 5], value, len); |
| 236 | } |
Mark Salyzyn | bd1ad04 | 2016-02-17 16:08:13 -0800 | [diff] [blame] | 237 | context->pos += needed; |
Mark Salyzyn | 67d7eaf | 2016-02-25 08:41:25 -0800 | [diff] [blame] | 238 | return len; |
| 239 | } |
| 240 | |
Mark Salyzyn | be1d3c2 | 2016-03-10 08:25:33 -0800 | [diff] [blame] | 241 | LIBLOG_ABI_PUBLIC int android_log_write_string8(android_log_context ctx, |
| 242 | const char *value) { |
Mark Salyzyn | 67d7eaf | 2016-02-25 08:41:25 -0800 | [diff] [blame] | 243 | return android_log_write_string8_len(ctx, value, MAX_EVENT_PAYLOAD); |
Mark Salyzyn | bd1ad04 | 2016-02-17 16:08:13 -0800 | [diff] [blame] | 244 | } |
| 245 | |
Mark Salyzyn | be1d3c2 | 2016-03-10 08:25:33 -0800 | [diff] [blame] | 246 | LIBLOG_ABI_PUBLIC int android_log_write_float32(android_log_context ctx, |
| 247 | float value) { |
Mark Salyzyn | bd1ad04 | 2016-02-17 16:08:13 -0800 | [diff] [blame] | 248 | size_t needed; |
| 249 | uint32_t ivalue; |
| 250 | android_log_context_internal *context; |
| 251 | |
| 252 | context = (android_log_context_internal *)ctx; |
| 253 | if (!context || (kAndroidLoggerWrite != context->read_write_flag)) { |
| 254 | return -EBADF; |
| 255 | } |
| 256 | if (context->overflow) { |
| 257 | return -EIO; |
| 258 | } |
| 259 | needed = sizeof(uint8_t) + sizeof(ivalue); |
| 260 | if ((context->pos + needed) > MAX_EVENT_PAYLOAD) { |
| 261 | context->overflow = true; |
| 262 | return -EIO; |
| 263 | } |
| 264 | ivalue = *(uint32_t *)&value; |
| 265 | context->count[context->list_nest_depth]++; |
| 266 | context->storage[context->pos + 0] = EVENT_TYPE_FLOAT; |
| 267 | copy4LE(&context->storage[context->pos + 1], ivalue); |
| 268 | context->pos += needed; |
| 269 | return 0; |
| 270 | } |
| 271 | |
Mark Salyzyn | be1d3c2 | 2016-03-10 08:25:33 -0800 | [diff] [blame] | 272 | LIBLOG_ABI_PUBLIC int android_log_write_list_end(android_log_context ctx) { |
Mark Salyzyn | bd1ad04 | 2016-02-17 16:08:13 -0800 | [diff] [blame] | 273 | android_log_context_internal *context; |
| 274 | |
| 275 | context = (android_log_context_internal *)ctx; |
| 276 | if (!context || (kAndroidLoggerWrite != context->read_write_flag)) { |
| 277 | return -EBADF; |
| 278 | } |
| 279 | if (context->list_nest_depth > ANDROID_MAX_LIST_NEST_DEPTH) { |
| 280 | context->overflow = true; |
| 281 | context->list_nest_depth--; |
| 282 | return -EOVERFLOW; |
| 283 | } |
| 284 | if (!context->list_nest_depth) { |
| 285 | context->overflow = true; |
| 286 | return -EOVERFLOW; |
| 287 | } |
| 288 | if (context->list[context->list_nest_depth] <= 0) { |
| 289 | context->list_nest_depth--; |
| 290 | context->overflow = true; |
| 291 | return -EOVERFLOW; |
| 292 | } |
| 293 | context->storage[context->list[context->list_nest_depth]] = |
| 294 | context->count[context->list_nest_depth]; |
| 295 | context->list_nest_depth--; |
| 296 | return 0; |
| 297 | } |
| 298 | |
| 299 | /* |
| 300 | * Logs the list of elements to the event log. |
| 301 | */ |
Mark Salyzyn | be1d3c2 | 2016-03-10 08:25:33 -0800 | [diff] [blame] | 302 | LIBLOG_ABI_PUBLIC int android_log_write_list(android_log_context ctx, |
| 303 | log_id_t id) { |
Mark Salyzyn | bd1ad04 | 2016-02-17 16:08:13 -0800 | [diff] [blame] | 304 | android_log_context_internal *context; |
| 305 | const char *msg; |
| 306 | ssize_t len; |
| 307 | |
| 308 | if ((id != LOG_ID_EVENTS) && (id != LOG_ID_SECURITY)) { |
| 309 | return -EINVAL; |
| 310 | } |
| 311 | |
| 312 | context = (android_log_context_internal *)ctx; |
| 313 | if (!context || (kAndroidLoggerWrite != context->read_write_flag)) { |
| 314 | return -EBADF; |
| 315 | } |
| 316 | if (context->list_nest_depth) { |
| 317 | return -EIO; |
| 318 | } |
| 319 | /* NB: if there was overflow, then log is truncated. Nothing reported */ |
| 320 | context->storage[1] = context->count[0]; |
| 321 | len = context->len = context->pos; |
| 322 | msg = (const char *)context->storage; |
| 323 | /* it'snot a list */ |
| 324 | if (context->count[0] <= 1) { |
| 325 | len -= sizeof(uint8_t) + sizeof(uint8_t); |
| 326 | if (len < 0) { |
| 327 | len = 0; |
| 328 | } |
| 329 | msg += sizeof(uint8_t) + sizeof(uint8_t); |
| 330 | } |
| 331 | return (id == LOG_ID_EVENTS) ? |
| 332 | __android_log_bwrite(context->tag, msg, len) : |
| 333 | __android_log_security_bwrite(context->tag, msg, len); |
| 334 | } |
| 335 | |
| 336 | /* |
| 337 | * Extract a 4-byte value from a byte stream. |
| 338 | */ |
| 339 | static inline uint32_t get4LE(const uint8_t* src) |
| 340 | { |
| 341 | return src[0] | (src[1] << 8) | (src[2] << 16) | (src[3] << 24); |
| 342 | } |
| 343 | |
| 344 | /* |
| 345 | * Extract an 8-byte value from a byte stream. |
| 346 | */ |
| 347 | static inline uint64_t get8LE(const uint8_t* src) |
| 348 | { |
| 349 | uint32_t low = src[0] | (src[1] << 8) | (src[2] << 16) | (src[3] << 24); |
| 350 | uint32_t high = src[4] | (src[5] << 8) | (src[6] << 16) | (src[7] << 24); |
| 351 | return ((uint64_t) high << 32) | (uint64_t) low; |
| 352 | } |
| 353 | |
| 354 | /* |
| 355 | * Gets the next element. Parsing errors result in an EVENT_TYPE_UNKNOWN type. |
| 356 | * If there is nothing to process, the complete field is set to non-zero. If |
| 357 | * an EVENT_TYPE_UNKNOWN type is returned once, and the caller does not check |
| 358 | * this and continues to call this function, the behavior is undefined |
| 359 | * (although it won't crash). |
| 360 | */ |
| 361 | static android_log_list_element android_log_read_next_internal( |
| 362 | android_log_context ctx, int peek) { |
| 363 | android_log_list_element elem; |
| 364 | unsigned pos; |
| 365 | android_log_context_internal *context; |
| 366 | |
| 367 | context = (android_log_context_internal *)ctx; |
| 368 | |
| 369 | memset(&elem, 0, sizeof(elem)); |
| 370 | |
| 371 | /* Nothing to parse from this context, so return complete. */ |
| 372 | if (!context || (kAndroidLoggerRead != context->read_write_flag) || |
| 373 | (context->list_nest_depth > ANDROID_MAX_LIST_NEST_DEPTH) || |
| 374 | (context->count[context->list_nest_depth] >= |
| 375 | (MAX_EVENT_PAYLOAD / (sizeof(uint8_t) + sizeof(uint8_t))))) { |
| 376 | elem.type = EVENT_TYPE_UNKNOWN; |
| 377 | if (context && |
| 378 | (context->list_stop || |
| 379 | ((context->list_nest_depth <= ANDROID_MAX_LIST_NEST_DEPTH) && |
| 380 | !context->count[context->list_nest_depth]))) { |
| 381 | elem.type = EVENT_TYPE_LIST_STOP; |
| 382 | } |
| 383 | elem.complete = true; |
| 384 | return elem; |
| 385 | } |
| 386 | |
| 387 | /* |
| 388 | * Use a different variable to update the position in case this |
| 389 | * operation is a "peek". |
| 390 | */ |
| 391 | pos = context->pos; |
| 392 | if (context->list_stop) { |
| 393 | elem.type = EVENT_TYPE_LIST_STOP; |
| 394 | elem.complete = !context->count[0] && (!context->list_nest_depth || |
| 395 | ((context->list_nest_depth == 1) && !context->count[1])); |
| 396 | if (!peek) { |
| 397 | /* Suck in superfluous stop */ |
| 398 | if (context->storage[pos] == EVENT_TYPE_LIST_STOP) { |
| 399 | context->pos = pos + 1; |
| 400 | } |
| 401 | if (context->list_nest_depth) { |
| 402 | --context->list_nest_depth; |
| 403 | if (context->count[context->list_nest_depth]) { |
| 404 | context->list_stop = false; |
| 405 | } |
| 406 | } else { |
| 407 | context->list_stop = false; |
| 408 | } |
| 409 | } |
| 410 | return elem; |
| 411 | } |
| 412 | if ((pos + 1) > context->len) { |
| 413 | elem.type = EVENT_TYPE_UNKNOWN; |
| 414 | elem.complete = true; |
| 415 | return elem; |
| 416 | } |
| 417 | |
| 418 | elem.type = context->storage[pos++]; |
| 419 | switch ((int)elem.type) { |
| 420 | case EVENT_TYPE_FLOAT: |
| 421 | /* Rely on union to translate elem.data.int32 into elem.data.float32 */ |
| 422 | /* FALLTHRU */ |
| 423 | case EVENT_TYPE_INT: |
| 424 | elem.len = sizeof(int32_t); |
| 425 | if ((pos + elem.len) > context->len) { |
| 426 | elem.type = EVENT_TYPE_UNKNOWN; |
| 427 | return elem; |
| 428 | } |
| 429 | elem.data.int32 = get4LE(&context->storage[pos]); |
| 430 | /* common tangeable object suffix */ |
| 431 | pos += elem.len; |
| 432 | elem.complete = !context->list_nest_depth && !context->count[0]; |
| 433 | if (!peek) { |
| 434 | if (!context->count[context->list_nest_depth] || |
| 435 | !--(context->count[context->list_nest_depth])) { |
| 436 | context->list_stop = true; |
| 437 | } |
| 438 | context->pos = pos; |
| 439 | } |
| 440 | return elem; |
| 441 | |
| 442 | case EVENT_TYPE_LONG: |
| 443 | elem.len = sizeof(int64_t); |
| 444 | if ((pos + elem.len) > context->len) { |
| 445 | elem.type = EVENT_TYPE_UNKNOWN; |
| 446 | return elem; |
| 447 | } |
| 448 | elem.data.int64 = get8LE(&context->storage[pos]); |
| 449 | /* common tangeable object suffix */ |
| 450 | pos += elem.len; |
| 451 | elem.complete = !context->list_nest_depth && !context->count[0]; |
| 452 | if (!peek) { |
| 453 | if (!context->count[context->list_nest_depth] || |
| 454 | !--(context->count[context->list_nest_depth])) { |
| 455 | context->list_stop = true; |
| 456 | } |
| 457 | context->pos = pos; |
| 458 | } |
| 459 | return elem; |
| 460 | |
| 461 | case EVENT_TYPE_STRING: |
| 462 | if ((pos + sizeof(int32_t)) > context->len) { |
| 463 | elem.type = EVENT_TYPE_UNKNOWN; |
| 464 | elem.complete = true; |
| 465 | return elem; |
| 466 | } |
| 467 | elem.len = get4LE(&context->storage[pos]); |
| 468 | pos += sizeof(int32_t); |
| 469 | if ((pos + elem.len) > context->len) { |
| 470 | elem.len = context->len - pos; /* truncate string */ |
| 471 | elem.complete = true; |
| 472 | if (!elem.len) { |
| 473 | elem.type = EVENT_TYPE_UNKNOWN; |
| 474 | return elem; |
| 475 | } |
| 476 | } |
| 477 | elem.data.string = (char *)&context->storage[pos]; |
| 478 | /* common tangeable object suffix */ |
| 479 | pos += elem.len; |
| 480 | elem.complete = !context->list_nest_depth && !context->count[0]; |
| 481 | if (!peek) { |
| 482 | if (!context->count[context->list_nest_depth] || |
| 483 | !--(context->count[context->list_nest_depth])) { |
| 484 | context->list_stop = true; |
| 485 | } |
| 486 | context->pos = pos; |
| 487 | } |
| 488 | return elem; |
| 489 | |
| 490 | case EVENT_TYPE_LIST: |
| 491 | if ((pos + sizeof(uint8_t)) > context->len) { |
| 492 | elem.type = EVENT_TYPE_UNKNOWN; |
| 493 | elem.complete = true; |
| 494 | return elem; |
| 495 | } |
| 496 | elem.complete = context->list_nest_depth >= ANDROID_MAX_LIST_NEST_DEPTH; |
| 497 | if (peek) { |
| 498 | return elem; |
| 499 | } |
| 500 | if (context->count[context->list_nest_depth]) { |
| 501 | context->count[context->list_nest_depth]--; |
| 502 | } |
| 503 | context->list_stop = !context->storage[pos]; |
| 504 | context->list_nest_depth++; |
| 505 | if (context->list_nest_depth <= ANDROID_MAX_LIST_NEST_DEPTH) { |
| 506 | context->count[context->list_nest_depth] = context->storage[pos]; |
| 507 | } |
| 508 | context->pos = pos + sizeof(uint8_t); |
| 509 | return elem; |
| 510 | |
| 511 | case EVENT_TYPE_LIST_STOP: /* Suprise Newline terminates lists. */ |
| 512 | if (!peek) { |
| 513 | context->pos = pos; |
| 514 | } |
| 515 | elem.type = EVENT_TYPE_UNKNOWN; |
| 516 | elem.complete = !context->list_nest_depth; |
| 517 | if (context->list_nest_depth > 0) { |
| 518 | elem.type = EVENT_TYPE_LIST_STOP; |
| 519 | if (!peek) { |
| 520 | context->list_nest_depth--; |
| 521 | } |
| 522 | } |
| 523 | return elem; |
| 524 | |
| 525 | default: |
| 526 | elem.type = EVENT_TYPE_UNKNOWN; |
| 527 | return elem; |
| 528 | } |
| 529 | } |
| 530 | |
Mark Salyzyn | be1d3c2 | 2016-03-10 08:25:33 -0800 | [diff] [blame] | 531 | LIBLOG_ABI_PUBLIC android_log_list_element android_log_read_next( |
| 532 | android_log_context ctx) { |
Mark Salyzyn | bd1ad04 | 2016-02-17 16:08:13 -0800 | [diff] [blame] | 533 | return android_log_read_next_internal(ctx, 0); |
| 534 | } |
| 535 | |
Mark Salyzyn | be1d3c2 | 2016-03-10 08:25:33 -0800 | [diff] [blame] | 536 | LIBLOG_ABI_PUBLIC android_log_list_element android_log_peek_next( |
| 537 | android_log_context ctx) { |
Mark Salyzyn | bd1ad04 | 2016-02-17 16:08:13 -0800 | [diff] [blame] | 538 | return android_log_read_next_internal(ctx, 1); |
| 539 | } |