1 /* 2 * Copyright (C) 2005 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 #define LOG_TAG "Parcel" 18 //#define LOG_NDEBUG 0 19 20 #include <binder/Parcel.h> 21 22 #include <binder/Binder.h> 23 #include <binder/BpBinder.h> 24 #include <utils/Debug.h> 25 #include <binder/ProcessState.h> 26 #include <utils/Log.h> 27 #include <utils/String8.h> 28 #include <utils/String16.h> 29 #include <utils/TextOutput.h> 30 #include <utils/misc.h> 31 #include <utils/Flattenable.h> 32 33 #include <private/binder/binder_module.h> 34 35 #include <stdio.h> 36 #include <stdlib.h> 37 #include <stdint.h> 38 39 #ifndef INT32_MAX 40 #define INT32_MAX ((int32_t)(2147483647)) 41 #endif 42 43 #define LOG_REFS(...) 44 //#define LOG_REFS(...) LOG(LOG_DEBUG, "Parcel", __VA_ARGS__) 45 46 // --------------------------------------------------------------------------- 47 48 #define PAD_SIZE(s) (((s)+3)&~3) 49 50 // XXX This can be made public if we want to provide 51 // support for typed data. 52 struct small_flat_data 53 { 54 uint32_t type; 55 uint32_t data; 56 }; 57 58 namespace android { 59 60 void acquire_object(const sp<ProcessState>& proc, 61 const flat_binder_object& obj, const void* who) 62 { 63 switch (obj.type) { 64 case BINDER_TYPE_BINDER: 65 if (obj.binder) { 66 LOG_REFS("Parcel %p acquiring reference on local %p", who, obj.cookie); 67 static_cast<IBinder*>(obj.cookie)->incStrong(who); 68 } 69 return; 70 case BINDER_TYPE_WEAK_BINDER: 71 if (obj.binder) 72 static_cast<RefBase::weakref_type*>(obj.binder)->incWeak(who); 73 return; 74 case BINDER_TYPE_HANDLE: { 75 const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle); 76 if (b != NULL) { 77 LOG_REFS("Parcel %p acquiring reference on remote %p", who, b.get()); 78 b->incStrong(who); 79 } 80 return; 81 } 82 case BINDER_TYPE_WEAK_HANDLE: { 83 const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle); 84 if (b != NULL) b.get_refs()->incWeak(who); 85 return; 86 } 87 case BINDER_TYPE_FD: { 88 // intentionally blank -- nothing to do to acquire this, but we do 89 // recognize it as a legitimate object type. 90 return; 91 } 92 } 93 94 LOGD("Invalid object type 0x%08lx", obj.type); 95 } 96 97 void release_object(const sp<ProcessState>& proc, 98 const flat_binder_object& obj, const void* who) 99 { 100 switch (obj.type) { 101 case BINDER_TYPE_BINDER: 102 if (obj.binder) { 103 LOG_REFS("Parcel %p releasing reference on local %p", who, obj.cookie); 104 static_cast<IBinder*>(obj.cookie)->decStrong(who); 105 } 106 return; 107 case BINDER_TYPE_WEAK_BINDER: 108 if (obj.binder) 109 static_cast<RefBase::weakref_type*>(obj.binder)->decWeak(who); 110 return; 111 case BINDER_TYPE_HANDLE: { 112 const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle); 113 if (b != NULL) { 114 LOG_REFS("Parcel %p releasing reference on remote %p", who, b.get()); 115 b->decStrong(who); 116 } 117 return; 118 } 119 case BINDER_TYPE_WEAK_HANDLE: { 120 const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle); 121 if (b != NULL) b.get_refs()->decWeak(who); 122 return; 123 } 124 case BINDER_TYPE_FD: { 125 if (obj.cookie != (void*)0) close(obj.handle); 126 return; 127 } 128 } 129 130 LOGE("Invalid object type 0x%08lx", obj.type); 131 } 132 133 inline static status_t finish_flatten_binder( 134 const sp<IBinder>& binder, const flat_binder_object& flat, Parcel* out) 135 { 136 return out->writeObject(flat, false); 137 } 138 139 status_t flatten_binder(const sp<ProcessState>& proc, 140 const sp<IBinder>& binder, Parcel* out) 141 { 142 flat_binder_object obj; 143 144 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 145 if (binder != NULL) { 146 IBinder *local = binder->localBinder(); 147 if (!local) { 148 BpBinder *proxy = binder->remoteBinder(); 149 if (proxy == NULL) { 150 LOGE("null proxy"); 151 } 152 const int32_t handle = proxy ? proxy->handle() : 0; 153 obj.type = BINDER_TYPE_HANDLE; 154 obj.handle = handle; 155 obj.cookie = NULL; 156 } else { 157 obj.type = BINDER_TYPE_BINDER; 158 obj.binder = local->getWeakRefs(); 159 obj.cookie = local; 160 } 161 } else { 162 obj.type = BINDER_TYPE_BINDER; 163 obj.binder = NULL; 164 obj.cookie = NULL; 165 } 166 167 return finish_flatten_binder(binder, obj, out); 168 } 169 170 status_t flatten_binder(const sp<ProcessState>& proc, 171 const wp<IBinder>& binder, Parcel* out) 172 { 173 flat_binder_object obj; 174 175 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 176 if (binder != NULL) { 177 sp<IBinder> real = binder.promote(); 178 if (real != NULL) { 179 IBinder *local = real->localBinder(); 180 if (!local) { 181 BpBinder *proxy = real->remoteBinder(); 182 if (proxy == NULL) { 183 LOGE("null proxy"); 184 } 185 const int32_t handle = proxy ? proxy->handle() : 0; 186 obj.type = BINDER_TYPE_WEAK_HANDLE; 187 obj.handle = handle; 188 obj.cookie = NULL; 189 } else { 190 obj.type = BINDER_TYPE_WEAK_BINDER; 191 obj.binder = binder.get_refs(); 192 obj.cookie = binder.unsafe_get(); 193 } 194 return finish_flatten_binder(real, obj, out); 195 } 196 197 // XXX How to deal? In order to flatten the given binder, 198 // we need to probe it for information, which requires a primary 199 // reference... but we don't have one. 200 // 201 // The OpenBinder implementation uses a dynamic_cast<> here, 202 // but we can't do that with the different reference counting 203 // implementation we are using. 204 LOGE("Unable to unflatten Binder weak reference!"); 205 obj.type = BINDER_TYPE_BINDER; 206 obj.binder = NULL; 207 obj.cookie = NULL; 208 return finish_flatten_binder(NULL, obj, out); 209 210 } else { 211 obj.type = BINDER_TYPE_BINDER; 212 obj.binder = NULL; 213 obj.cookie = NULL; 214 return finish_flatten_binder(NULL, obj, out); 215 } 216 } 217 218 inline static status_t finish_unflatten_binder( 219 BpBinder* proxy, const flat_binder_object& flat, const Parcel& in) 220 { 221 return NO_ERROR; 222 } 223 224 status_t unflatten_binder(const sp<ProcessState>& proc, 225 const Parcel& in, sp<IBinder>* out) 226 { 227 const flat_binder_object* flat = in.readObject(false); 228 229 if (flat) { 230 switch (flat->type) { 231 case BINDER_TYPE_BINDER: 232 *out = static_cast<IBinder*>(flat->cookie); 233 return finish_unflatten_binder(NULL, *flat, in); 234 case BINDER_TYPE_HANDLE: 235 *out = proc->getStrongProxyForHandle(flat->handle); 236 return finish_unflatten_binder( 237 static_cast<BpBinder*>(out->get()), *flat, in); 238 } 239 } 240 return BAD_TYPE; 241 } 242 243 status_t unflatten_binder(const sp<ProcessState>& proc, 244 const Parcel& in, wp<IBinder>* out) 245 { 246 const flat_binder_object* flat = in.readObject(false); 247 248 if (flat) { 249 switch (flat->type) { 250 case BINDER_TYPE_BINDER: 251 *out = static_cast<IBinder*>(flat->cookie); 252 return finish_unflatten_binder(NULL, *flat, in); 253 case BINDER_TYPE_WEAK_BINDER: 254 if (flat->binder != NULL) { 255 out->set_object_and_refs( 256 static_cast<IBinder*>(flat->cookie), 257 static_cast<RefBase::weakref_type*>(flat->binder)); 258 } else { 259 *out = NULL; 260 } 261 return finish_unflatten_binder(NULL, *flat, in); 262 case BINDER_TYPE_HANDLE: 263 case BINDER_TYPE_WEAK_HANDLE: 264 *out = proc->getWeakProxyForHandle(flat->handle); 265 return finish_unflatten_binder( 266 static_cast<BpBinder*>(out->unsafe_get()), *flat, in); 267 } 268 } 269 return BAD_TYPE; 270 } 271 272 // --------------------------------------------------------------------------- 273 274 Parcel::Parcel() 275 { 276 initState(); 277 } 278 279 Parcel::~Parcel() 280 { 281 freeDataNoInit(); 282 } 283 284 const uint8_t* Parcel::data() const 285 { 286 return mData; 287 } 288 289 size_t Parcel::dataSize() const 290 { 291 return (mDataSize > mDataPos ? mDataSize : mDataPos); 292 } 293 294 size_t Parcel::dataAvail() const 295 { 296 // TODO: decide what to do about the possibility that this can 297 // report an available-data size that exceeds a Java int's max 298 // positive value, causing havoc. Fortunately this will only 299 // happen if someone constructs a Parcel containing more than two 300 // gigabytes of data, which on typical phone hardware is simply 301 // not possible. 302 return dataSize() - dataPosition(); 303 } 304 305 size_t Parcel::dataPosition() const 306 { 307 return mDataPos; 308 } 309 310 size_t Parcel::dataCapacity() const 311 { 312 return mDataCapacity; 313 } 314 315 status_t Parcel::setDataSize(size_t size) 316 { 317 status_t err; 318 err = continueWrite(size); 319 if (err == NO_ERROR) { 320 mDataSize = size; 321 LOGV("setDataSize Setting data size of %p to %d\n", this, mDataSize); 322 } 323 return err; 324 } 325 326 void Parcel::setDataPosition(size_t pos) const 327 { 328 mDataPos = pos; 329 mNextObjectHint = 0; 330 } 331 332 status_t Parcel::setDataCapacity(size_t size) 333 { 334 if (size > mDataSize) return continueWrite(size); 335 return NO_ERROR; 336 } 337 338 status_t Parcel::setData(const uint8_t* buffer, size_t len) 339 { 340 status_t err = restartWrite(len); 341 if (err == NO_ERROR) { 342 memcpy(const_cast<uint8_t*>(data()), buffer, len); 343 mDataSize = len; 344 mFdsKnown = false; 345 } 346 return err; 347 } 348 349 status_t Parcel::appendFrom(Parcel *parcel, size_t offset, size_t len) 350 { 351 const sp<ProcessState> proc(ProcessState::self()); 352 status_t err; 353 uint8_t *data = parcel->mData; 354 size_t *objects = parcel->mObjects; 355 size_t size = parcel->mObjectsSize; 356 int startPos = mDataPos; 357 int firstIndex = -1, lastIndex = -2; 358 359 if (len == 0) { 360 return NO_ERROR; 361 } 362 363 // range checks against the source parcel size 364 if ((offset > parcel->mDataSize) 365 || (len > parcel->mDataSize) 366 || (offset + len > parcel->mDataSize)) { 367 return BAD_VALUE; 368 } 369 370 // Count objects in range 371 for (int i = 0; i < (int) size; i++) { 372 size_t off = objects[i]; 373 if ((off >= offset) && (off < offset + len)) { 374 if (firstIndex == -1) { 375 firstIndex = i; 376 } 377 lastIndex = i; 378 } 379 } 380 int numObjects = lastIndex - firstIndex + 1; 381 382 // grow data 383 err = growData(len); 384 if (err != NO_ERROR) { 385 return err; 386 } 387 388 // append data 389 memcpy(mData + mDataPos, data + offset, len); 390 mDataPos += len; 391 mDataSize += len; 392 393 if (numObjects > 0) { 394 // grow objects 395 if (mObjectsCapacity < mObjectsSize + numObjects) { 396 int newSize = ((mObjectsSize + numObjects)*3)/2; 397 size_t *objects = 398 (size_t*)realloc(mObjects, newSize*sizeof(size_t)); 399 if (objects == (size_t*)0) { 400 return NO_MEMORY; 401 } 402 mObjects = objects; 403 mObjectsCapacity = newSize; 404 } 405 406 // append and acquire objects 407 int idx = mObjectsSize; 408 for (int i = firstIndex; i <= lastIndex; i++) { 409 size_t off = objects[i] - offset + startPos; 410 mObjects[idx++] = off; 411 mObjectsSize++; 412 413 flat_binder_object* flat 414 = reinterpret_cast<flat_binder_object*>(mData + off); 415 acquire_object(proc, *flat, this); 416 417 if (flat->type == BINDER_TYPE_FD) { 418 // If this is a file descriptor, we need to dup it so the 419 // new Parcel now owns its own fd, and can declare that we 420 // officially know we have fds. 421 flat->handle = dup(flat->handle); 422 flat->cookie = (void*)1; 423 mHasFds = mFdsKnown = true; 424 } 425 } 426 } 427 428 return NO_ERROR; 429 } 430 431 bool Parcel::hasFileDescriptors() const 432 { 433 if (!mFdsKnown) { 434 scanForFds(); 435 } 436 return mHasFds; 437 } 438 439 status_t Parcel::writeInterfaceToken(const String16& interface) 440 { 441 // currently the interface identification token is just its name as a string 442 return writeString16(interface); 443 } 444 445 bool Parcel::checkInterface(IBinder* binder) const 446 { 447 return enforceInterface(binder->getInterfaceDescriptor()); 448 } 449 450 bool Parcel::enforceInterface(const String16& interface) const 451 { 452 const String16 str(readString16()); 453 if (str == interface) { 454 return true; 455 } else { 456 LOGW("**** enforceInterface() expected '%s' but read '%s'\n", 457 String8(interface).string(), String8(str).string()); 458 return false; 459 } 460 } 461 462 const size_t* Parcel::objects() const 463 { 464 return mObjects; 465 } 466 467 size_t Parcel::objectsCount() const 468 { 469 return mObjectsSize; 470 } 471 472 status_t Parcel::errorCheck() const 473 { 474 return mError; 475 } 476 477 void Parcel::setError(status_t err) 478 { 479 mError = err; 480 } 481 482 status_t Parcel::finishWrite(size_t len) 483 { 484 //printf("Finish write of %d\n", len); 485 mDataPos += len; 486 LOGV("finishWrite Setting data pos of %p to %d\n", this, mDataPos); 487 if (mDataPos > mDataSize) { 488 mDataSize = mDataPos; 489 LOGV("finishWrite Setting data size of %p to %d\n", this, mDataSize); 490 } 491 //printf("New pos=%d, size=%d\n", mDataPos, mDataSize); 492 return NO_ERROR; 493 } 494 495 status_t Parcel::writeUnpadded(const void* data, size_t len) 496 { 497 size_t end = mDataPos + len; 498 if (end < mDataPos) { 499 // integer overflow 500 return BAD_VALUE; 501 } 502 503 if (end <= mDataCapacity) { 504 restart_write: 505 memcpy(mData+mDataPos, data, len); 506 return finishWrite(len); 507 } 508 509 status_t err = growData(len); 510 if (err == NO_ERROR) goto restart_write; 511 return err; 512 } 513 514 status_t Parcel::write(const void* data, size_t len) 515 { 516 void* const d = writeInplace(len); 517 if (d) { 518 memcpy(d, data, len); 519 return NO_ERROR; 520 } 521 return mError; 522 } 523 524 void* Parcel::writeInplace(size_t len) 525 { 526 const size_t padded = PAD_SIZE(len); 527 528 // sanity check for integer overflow 529 if (mDataPos+padded < mDataPos) { 530 return NULL; 531 } 532 533 if ((mDataPos+padded) <= mDataCapacity) { 534 restart_write: 535 //printf("Writing %ld bytes, padded to %ld\n", len, padded); 536 uint8_t* const data = mData+mDataPos; 537 538 // Need to pad at end? 539 if (padded != len) { 540 #if BYTE_ORDER == BIG_ENDIAN 541 static const uint32_t mask[4] = { 542 0x00000000, 0xffffff00, 0xffff0000, 0xff000000 543 }; 544 #endif 545 #if BYTE_ORDER == LITTLE_ENDIAN 546 static const uint32_t mask[4] = { 547 0x00000000, 0x00ffffff, 0x0000ffff, 0x000000ff 548 }; 549 #endif 550 //printf("Applying pad mask: %p to %p\n", (void*)mask[padded-len], 551 // *reinterpret_cast<void**>(data+padded-4)); 552 *reinterpret_cast<uint32_t*>(data+padded-4) &= mask[padded-len]; 553 } 554 555 finishWrite(padded); 556 return data; 557 } 558 559 status_t err = growData(padded); 560 if (err == NO_ERROR) goto restart_write; 561 return NULL; 562 } 563 564 status_t Parcel::writeInt32(int32_t val) 565 { 566 return writeAligned(val); 567 } 568 569 status_t Parcel::writeInt64(int64_t val) 570 { 571 return writeAligned(val); 572 } 573 574 status_t Parcel::writeFloat(float val) 575 { 576 return writeAligned(val); 577 } 578 579 status_t Parcel::writeDouble(double val) 580 { 581 return writeAligned(val); 582 } 583 584 status_t Parcel::writeIntPtr(intptr_t val) 585 { 586 return writeAligned(val); 587 } 588 589 status_t Parcel::writeCString(const char* str) 590 { 591 return write(str, strlen(str)+1); 592 } 593 594 status_t Parcel::writeString8(const String8& str) 595 { 596 status_t err = writeInt32(str.bytes()); 597 if (err == NO_ERROR) { 598 err = write(str.string(), str.bytes()+1); 599 } 600 return err; 601 } 602 603 status_t Parcel::writeString16(const String16& str) 604 { 605 return writeString16(str.string(), str.size()); 606 } 607 608 status_t Parcel::writeString16(const char16_t* str, size_t len) 609 { 610 if (str == NULL) return writeInt32(-1); 611 612 status_t err = writeInt32(len); 613 if (err == NO_ERROR) { 614 len *= sizeof(char16_t); 615 uint8_t* data = (uint8_t*)writeInplace(len+sizeof(char16_t)); 616 if (data) { 617 memcpy(data, str, len); 618 *reinterpret_cast<char16_t*>(data+len) = 0; 619 return NO_ERROR; 620 } 621 err = mError; 622 } 623 return err; 624 } 625 626 status_t Parcel::writeStrongBinder(const sp<IBinder>& val) 627 { 628 return flatten_binder(ProcessState::self(), val, this); 629 } 630 631 status_t Parcel::writeWeakBinder(const wp<IBinder>& val) 632 { 633 return flatten_binder(ProcessState::self(), val, this); 634 } 635 636 status_t Parcel::writeNativeHandle(const native_handle* handle) 637 { 638 if (!handle || handle->version != sizeof(native_handle)) 639 return BAD_TYPE; 640 641 status_t err; 642 err = writeInt32(handle->numFds); 643 if (err != NO_ERROR) return err; 644 645 err = writeInt32(handle->numInts); 646 if (err != NO_ERROR) return err; 647 648 for (int i=0 ; err==NO_ERROR && i<handle->numFds ; i++) 649 err = writeDupFileDescriptor(handle->data[i]); 650 651 if (err != NO_ERROR) { 652 LOGD("write native handle, write dup fd failed"); 653 return err; 654 } 655 err = write(handle->data + handle->numFds, sizeof(int)*handle->numInts); 656 return err; 657 } 658 659 status_t Parcel::writeFileDescriptor(int fd) 660 { 661 flat_binder_object obj; 662 obj.type = BINDER_TYPE_FD; 663 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 664 obj.handle = fd; 665 obj.cookie = (void*)0; 666 return writeObject(obj, true); 667 } 668 669 status_t Parcel::writeDupFileDescriptor(int fd) 670 { 671 flat_binder_object obj; 672 obj.type = BINDER_TYPE_FD; 673 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 674 obj.handle = dup(fd); 675 obj.cookie = (void*)1; 676 return writeObject(obj, true); 677 } 678 679 status_t Parcel::write(const Flattenable& val) 680 { 681 status_t err; 682 683 // size if needed 684 size_t len = val.getFlattenedSize(); 685 size_t fd_count = val.getFdCount(); 686 687 err = this->writeInt32(len); 688 if (err) return err; 689 690 err = this->writeInt32(fd_count); 691 if (err) return err; 692 693 // payload 694 void* buf = this->writeInplace(PAD_SIZE(len)); 695 if (buf == NULL) 696 return BAD_VALUE; 697 698 int* fds = NULL; 699 if (fd_count) { 700 fds = new int[fd_count]; 701 } 702 703 err = val.flatten(buf, len, fds, fd_count); 704 for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) { 705 err = this->writeDupFileDescriptor( fds[i] ); 706 } 707 708 if (fd_count) { 709 delete [] fds; 710 } 711 712 return err; 713 } 714 715 status_t Parcel::writeObject(const flat_binder_object& val, bool nullMetaData) 716 { 717 const bool enoughData = (mDataPos+sizeof(val)) <= mDataCapacity; 718 const bool enoughObjects = mObjectsSize < mObjectsCapacity; 719 if (enoughData && enoughObjects) { 720 restart_write: 721 *reinterpret_cast<flat_binder_object*>(mData+mDataPos) = val; 722 723 // Need to write meta-data? 724 if (nullMetaData || val.binder != NULL) { 725 mObjects[mObjectsSize] = mDataPos; 726 acquire_object(ProcessState::self(), val, this); 727 mObjectsSize++; 728 } 729 730 // remember if it's a file descriptor 731 if (val.type == BINDER_TYPE_FD) { 732 mHasFds = mFdsKnown = true; 733 } 734 735 return finishWrite(sizeof(flat_binder_object)); 736 } 737 738 if (!enoughData) { 739 const status_t err = growData(sizeof(val)); 740 if (err != NO_ERROR) return err; 741 } 742 if (!enoughObjects) { 743 size_t newSize = ((mObjectsSize+2)*3)/2; 744 size_t* objects = (size_t*)realloc(mObjects, newSize*sizeof(size_t)); 745 if (objects == NULL) return NO_MEMORY; 746 mObjects = objects; 747 mObjectsCapacity = newSize; 748 } 749 750 goto restart_write; 751 } 752 753 void Parcel::remove(size_t start, size_t amt) 754 { 755 LOG_ALWAYS_FATAL("Parcel::remove() not yet implemented!"); 756 } 757 758 status_t Parcel::read(void* outData, size_t len) const 759 { 760 if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize) { 761 memcpy(outData, mData+mDataPos, len); 762 mDataPos += PAD_SIZE(len); 763 LOGV("read Setting data pos of %p to %d\n", this, mDataPos); 764 return NO_ERROR; 765 } 766 return NOT_ENOUGH_DATA; 767 } 768 769 const void* Parcel::readInplace(size_t len) const 770 { 771 if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize) { 772 const void* data = mData+mDataPos; 773 mDataPos += PAD_SIZE(len); 774 LOGV("readInplace Setting data pos of %p to %d\n", this, mDataPos); 775 return data; 776 } 777 return NULL; 778 } 779 780 template<class T> 781 status_t Parcel::readAligned(T *pArg) const { 782 COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T)); 783 784 if ((mDataPos+sizeof(T)) <= mDataSize) { 785 const void* data = mData+mDataPos; 786 mDataPos += sizeof(T); 787 *pArg = *reinterpret_cast<const T*>(data); 788 return NO_ERROR; 789 } else { 790 return NOT_ENOUGH_DATA; 791 } 792 } 793 794 template<class T> 795 T Parcel::readAligned() const { 796 T result; 797 if (readAligned(&result) != NO_ERROR) { 798 result = 0; 799 } 800 801 return result; 802 } 803 804 template<class T> 805 status_t Parcel::writeAligned(T val) { 806 COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T)); 807 808 if ((mDataPos+sizeof(val)) <= mDataCapacity) { 809 restart_write: 810 *reinterpret_cast<T*>(mData+mDataPos) = val; 811 return finishWrite(sizeof(val)); 812 } 813 814 status_t err = growData(sizeof(val)); 815 if (err == NO_ERROR) goto restart_write; 816 return err; 817 } 818 819 status_t Parcel::readInt32(int32_t *pArg) const 820 { 821 return readAligned(pArg); 822 } 823 824 int32_t Parcel::readInt32() const 825 { 826 return readAligned<int32_t>(); 827 } 828 829 830 status_t Parcel::readInt64(int64_t *pArg) const 831 { 832 return readAligned(pArg); 833 } 834 835 836 int64_t Parcel::readInt64() const 837 { 838 return readAligned<int64_t>(); 839 } 840 841 status_t Parcel::readFloat(float *pArg) const 842 { 843 return readAligned(pArg); 844 } 845 846 847 float Parcel::readFloat() const 848 { 849 return readAligned<float>(); 850 } 851 852 status_t Parcel::readDouble(double *pArg) const 853 { 854 return readAligned(pArg); 855 } 856 857 858 double Parcel::readDouble() const 859 { 860 return readAligned<double>(); 861 } 862 863 status_t Parcel::readIntPtr(intptr_t *pArg) const 864 { 865 return readAligned(pArg); 866 } 867 868 869 intptr_t Parcel::readIntPtr() const 870 { 871 return readAligned<intptr_t>(); 872 } 873 874 875 const char* Parcel::readCString() const 876 { 877 const size_t avail = mDataSize-mDataPos; 878 if (avail > 0) { 879 const char* str = reinterpret_cast<const char*>(mData+mDataPos); 880 // is the string's trailing NUL within the parcel's valid bounds? 881 const char* eos = reinterpret_cast<const char*>(memchr(str, 0, avail)); 882 if (eos) { 883 const size_t len = eos - str; 884 mDataPos += PAD_SIZE(len+1); 885 LOGV("readCString Setting data pos of %p to %d\n", this, mDataPos); 886 return str; 887 } 888 } 889 return NULL; 890 } 891 892 String8 Parcel::readString8() const 893 { 894 int32_t size = readInt32(); 895 // watch for potential int overflow adding 1 for trailing NUL 896 if (size > 0 && size < INT32_MAX) { 897 const char* str = (const char*)readInplace(size+1); 898 if (str) return String8(str, size); 899 } 900 return String8(); 901 } 902 903 String16 Parcel::readString16() const 904 { 905 size_t len; 906 const char16_t* str = readString16Inplace(&len); 907 if (str) return String16(str, len); 908 LOGE("Reading a NULL string not supported here."); 909 return String16(); 910 } 911 912 const char16_t* Parcel::readString16Inplace(size_t* outLen) const 913 { 914 int32_t size = readInt32(); 915 // watch for potential int overflow from size+1 916 if (size >= 0 && size < INT32_MAX) { 917 *outLen = size; 918 const char16_t* str = (const char16_t*)readInplace((size+1)*sizeof(char16_t)); 919 if (str != NULL) { 920 return str; 921 } 922 } 923 *outLen = 0; 924 return NULL; 925 } 926 927 sp<IBinder> Parcel::readStrongBinder() const 928 { 929 sp<IBinder> val; 930 unflatten_binder(ProcessState::self(), *this, &val); 931 return val; 932 } 933 934 wp<IBinder> Parcel::readWeakBinder() const 935 { 936 wp<IBinder> val; 937 unflatten_binder(ProcessState::self(), *this, &val); 938 return val; 939 } 940 941 942 native_handle* Parcel::readNativeHandle() const 943 { 944 int numFds, numInts; 945 status_t err; 946 err = readInt32(&numFds); 947 if (err != NO_ERROR) return 0; 948 err = readInt32(&numInts); 949 if (err != NO_ERROR) return 0; 950 951 native_handle* h = native_handle_create(numFds, numInts); 952 for (int i=0 ; err==NO_ERROR && i<numFds ; i++) { 953 h->data[i] = dup(readFileDescriptor()); 954 if (h->data[i] < 0) err = BAD_VALUE; 955 } 956 err = read(h->data + numFds, sizeof(int)*numInts); 957 if (err != NO_ERROR) { 958 native_handle_close(h); 959 native_handle_delete(h); 960 h = 0; 961 } 962 return h; 963 } 964 965 966 int Parcel::readFileDescriptor() const 967 { 968 const flat_binder_object* flat = readObject(true); 969 if (flat) { 970 switch (flat->type) { 971 case BINDER_TYPE_FD: 972 //LOGI("Returning file descriptor %ld from parcel %p\n", flat->handle, this); 973 return flat->handle; 974 } 975 } 976 return BAD_TYPE; 977 } 978 979 status_t Parcel::read(Flattenable& val) const 980 { 981 // size 982 const size_t len = this->readInt32(); 983 const size_t fd_count = this->readInt32(); 984 985 // payload 986 void const* buf = this->readInplace(PAD_SIZE(len)); 987 if (buf == NULL) 988 return BAD_VALUE; 989 990 int* fds = NULL; 991 if (fd_count) { 992 fds = new int[fd_count]; 993 } 994 995 status_t err = NO_ERROR; 996 for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) { 997 fds[i] = dup(this->readFileDescriptor()); 998 if (fds[i] < 0) err = BAD_VALUE; 999 } 1000 1001 if (err == NO_ERROR) { 1002 err = val.unflatten(buf, len, fds, fd_count); 1003 } 1004 1005 if (fd_count) { 1006 delete [] fds; 1007 } 1008 1009 return err; 1010 } 1011 const flat_binder_object* Parcel::readObject(bool nullMetaData) const 1012 { 1013 const size_t DPOS = mDataPos; 1014 if ((DPOS+sizeof(flat_binder_object)) <= mDataSize) { 1015 const flat_binder_object* obj 1016 = reinterpret_cast<const flat_binder_object*>(mData+DPOS); 1017 mDataPos = DPOS + sizeof(flat_binder_object); 1018 if (!nullMetaData && (obj->cookie == NULL && obj->binder == NULL)) { 1019 // When transferring a NULL object, we don't write it into 1020 // the object list, so we don't want to check for it when 1021 // reading. 1022 LOGV("readObject Setting data pos of %p to %d\n", this, mDataPos); 1023 return obj; 1024 } 1025 1026 // Ensure that this object is valid... 1027 size_t* const OBJS = mObjects; 1028 const size_t N = mObjectsSize; 1029 size_t opos = mNextObjectHint; 1030 1031 if (N > 0) { 1032 LOGV("Parcel %p looking for obj at %d, hint=%d\n", 1033 this, DPOS, opos); 1034 1035 // Start at the current hint position, looking for an object at 1036 // the current data position. 1037 if (opos < N) { 1038 while (opos < (N-1) && OBJS[opos] < DPOS) { 1039 opos++; 1040 } 1041 } else { 1042 opos = N-1; 1043 } 1044 if (OBJS[opos] == DPOS) { 1045 // Found it! 1046 LOGV("Parcel found obj %d at index %d with forward search", 1047 this, DPOS, opos); 1048 mNextObjectHint = opos+1; 1049 LOGV("readObject Setting data pos of %p to %d\n", this, mDataPos); 1050 return obj; 1051 } 1052 1053 // Look backwards for it... 1054 while (opos > 0 && OBJS[opos] > DPOS) { 1055 opos--; 1056 } 1057 if (OBJS[opos] == DPOS) { 1058 // Found it! 1059 LOGV("Parcel found obj %d at index %d with backward search", 1060 this, DPOS, opos); 1061 mNextObjectHint = opos+1; 1062 LOGV("readObject Setting data pos of %p to %d\n", this, mDataPos); 1063 return obj; 1064 } 1065 } 1066 LOGW("Attempt to read object from Parcel %p at offset %d that is not in the object list", 1067 this, DPOS); 1068 } 1069 return NULL; 1070 } 1071 1072 void Parcel::closeFileDescriptors() 1073 { 1074 size_t i = mObjectsSize; 1075 if (i > 0) { 1076 //LOGI("Closing file descriptors for %d objects...", mObjectsSize); 1077 } 1078 while (i > 0) { 1079 i--; 1080 const flat_binder_object* flat 1081 = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]); 1082 if (flat->type == BINDER_TYPE_FD) { 1083 //LOGI("Closing fd: %ld\n", flat->handle); 1084 close(flat->handle); 1085 } 1086 } 1087 } 1088 1089 const uint8_t* Parcel::ipcData() const 1090 { 1091 return mData; 1092 } 1093 1094 size_t Parcel::ipcDataSize() const 1095 { 1096 return (mDataSize > mDataPos ? mDataSize : mDataPos); 1097 } 1098 1099 const size_t* Parcel::ipcObjects() const 1100 { 1101 return mObjects; 1102 } 1103 1104 size_t Parcel::ipcObjectsCount() const 1105 { 1106 return mObjectsSize; 1107 } 1108 1109 void Parcel::ipcSetDataReference(const uint8_t* data, size_t dataSize, 1110 const size_t* objects, size_t objectsCount, release_func relFunc, void* relCookie) 1111 { 1112 freeDataNoInit(); 1113 mError = NO_ERROR; 1114 mData = const_cast<uint8_t*>(data); 1115 mDataSize = mDataCapacity = dataSize; 1116 //LOGI("setDataReference Setting data size of %p to %lu (pid=%d)\n", this, mDataSize, getpid()); 1117 mDataPos = 0; 1118 LOGV("setDataReference Setting data pos of %p to %d\n", this, mDataPos); 1119 mObjects = const_cast<size_t*>(objects); 1120 mObjectsSize = mObjectsCapacity = objectsCount; 1121 mNextObjectHint = 0; 1122 mOwner = relFunc; 1123 mOwnerCookie = relCookie; 1124 scanForFds(); 1125 } 1126 1127 void Parcel::print(TextOutput& to, uint32_t flags) const 1128 { 1129 to << "Parcel("; 1130 1131 if (errorCheck() != NO_ERROR) { 1132 const status_t err = errorCheck(); 1133 to << "Error: " << (void*)err << " \"" << strerror(-err) << "\""; 1134 } else if (dataSize() > 0) { 1135 const uint8_t* DATA = data(); 1136 to << indent << HexDump(DATA, dataSize()) << dedent; 1137 const size_t* OBJS = objects(); 1138 const size_t N = objectsCount(); 1139 for (size_t i=0; i<N; i++) { 1140 const flat_binder_object* flat 1141 = reinterpret_cast<const flat_binder_object*>(DATA+OBJS[i]); 1142 to << endl << "Object #" << i << " @ " << (void*)OBJS[i] << ": " 1143 << TypeCode(flat->type & 0x7f7f7f00) 1144 << " = " << flat->binder; 1145 } 1146 } else { 1147 to << "NULL"; 1148 } 1149 1150 to << ")"; 1151 } 1152 1153 void Parcel::releaseObjects() 1154 { 1155 const sp<ProcessState> proc(ProcessState::self()); 1156 size_t i = mObjectsSize; 1157 uint8_t* const data = mData; 1158 size_t* const objects = mObjects; 1159 while (i > 0) { 1160 i--; 1161 const flat_binder_object* flat 1162 = reinterpret_cast<flat_binder_object*>(data+objects[i]); 1163 release_object(proc, *flat, this); 1164 } 1165 } 1166 1167 void Parcel::acquireObjects() 1168 { 1169 const sp<ProcessState> proc(ProcessState::self()); 1170 size_t i = mObjectsSize; 1171 uint8_t* const data = mData; 1172 size_t* const objects = mObjects; 1173 while (i > 0) { 1174 i--; 1175 const flat_binder_object* flat 1176 = reinterpret_cast<flat_binder_object*>(data+objects[i]); 1177 acquire_object(proc, *flat, this); 1178 } 1179 } 1180 1181 void Parcel::freeData() 1182 { 1183 freeDataNoInit(); 1184 initState(); 1185 } 1186 1187 void Parcel::freeDataNoInit() 1188 { 1189 if (mOwner) { 1190 //LOGI("Freeing data ref of %p (pid=%d)\n", this, getpid()); 1191 mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie); 1192 } else { 1193 releaseObjects(); 1194 if (mData) free(mData); 1195 if (mObjects) free(mObjects); 1196 } 1197 } 1198 1199 status_t Parcel::growData(size_t len) 1200 { 1201 size_t newSize = ((mDataSize+len)*3)/2; 1202 return (newSize <= mDataSize) 1203 ? (status_t) NO_MEMORY 1204 : continueWrite(newSize); 1205 } 1206 1207 status_t Parcel::restartWrite(size_t desired) 1208 { 1209 if (mOwner) { 1210 freeData(); 1211 return continueWrite(desired); 1212 } 1213 1214 uint8_t* data = (uint8_t*)realloc(mData, desired); 1215 if (!data && desired > mDataCapacity) { 1216 mError = NO_MEMORY; 1217 return NO_MEMORY; 1218 } 1219 1220 releaseObjects(); 1221 1222 if (data) { 1223 mData = data; 1224 mDataCapacity = desired; 1225 } 1226 1227 mDataSize = mDataPos = 0; 1228 LOGV("restartWrite Setting data size of %p to %d\n", this, mDataSize); 1229 LOGV("restartWrite Setting data pos of %p to %d\n", this, mDataPos); 1230 1231 free(mObjects); 1232 mObjects = NULL; 1233 mObjectsSize = mObjectsCapacity = 0; 1234 mNextObjectHint = 0; 1235 mHasFds = false; 1236 mFdsKnown = true; 1237 1238 return NO_ERROR; 1239 } 1240 1241 status_t Parcel::continueWrite(size_t desired) 1242 { 1243 // If shrinking, first adjust for any objects that appear 1244 // after the new data size. 1245 size_t objectsSize = mObjectsSize; 1246 if (desired < mDataSize) { 1247 if (desired == 0) { 1248 objectsSize = 0; 1249 } else { 1250 while (objectsSize > 0) { 1251 if (mObjects[objectsSize-1] < desired) 1252 break; 1253 objectsSize--; 1254 } 1255 } 1256 } 1257 1258 if (mOwner) { 1259 // If the size is going to zero, just release the owner's data. 1260 if (desired == 0) { 1261 freeData(); 1262 return NO_ERROR; 1263 } 1264 1265 // If there is a different owner, we need to take 1266 // posession. 1267 uint8_t* data = (uint8_t*)malloc(desired); 1268 if (!data) { 1269 mError = NO_MEMORY; 1270 return NO_MEMORY; 1271 } 1272 size_t* objects = NULL; 1273 1274 if (objectsSize) { 1275 objects = (size_t*)malloc(objectsSize*sizeof(size_t)); 1276 if (!objects) { 1277 mError = NO_MEMORY; 1278 return NO_MEMORY; 1279 } 1280 1281 // Little hack to only acquire references on objects 1282 // we will be keeping. 1283 size_t oldObjectsSize = mObjectsSize; 1284 mObjectsSize = objectsSize; 1285 acquireObjects(); 1286 mObjectsSize = oldObjectsSize; 1287 } 1288 1289 if (mData) { 1290 memcpy(data, mData, mDataSize < desired ? mDataSize : desired); 1291 } 1292 if (objects && mObjects) { 1293 memcpy(objects, mObjects, objectsSize*sizeof(size_t)); 1294 } 1295 //LOGI("Freeing data ref of %p (pid=%d)\n", this, getpid()); 1296 mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie); 1297 mOwner = NULL; 1298 1299 mData = data; 1300 mObjects = objects; 1301 mDataSize = (mDataSize < desired) ? mDataSize : desired; 1302 LOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize); 1303 mDataCapacity = desired; 1304 mObjectsSize = mObjectsCapacity = objectsSize; 1305 mNextObjectHint = 0; 1306 1307 } else if (mData) { 1308 if (objectsSize < mObjectsSize) { 1309 // Need to release refs on any objects we are dropping. 1310 const sp<ProcessState> proc(ProcessState::self()); 1311 for (size_t i=objectsSize; i<mObjectsSize; i++) { 1312 const flat_binder_object* flat 1313 = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]); 1314 if (flat->type == BINDER_TYPE_FD) { 1315 // will need to rescan because we may have lopped off the only FDs 1316 mFdsKnown = false; 1317 } 1318 release_object(proc, *flat, this); 1319 } 1320 size_t* objects = 1321 (size_t*)realloc(mObjects, objectsSize*sizeof(size_t)); 1322 if (objects) { 1323 mObjects = objects; 1324 } 1325 mObjectsSize = objectsSize; 1326 mNextObjectHint = 0; 1327 } 1328 1329 // We own the data, so we can just do a realloc(). 1330 if (desired > mDataCapacity) { 1331 uint8_t* data = (uint8_t*)realloc(mData, desired); 1332 if (data) { 1333 mData = data; 1334 mDataCapacity = desired; 1335 } else if (desired > mDataCapacity) { 1336 mError = NO_MEMORY; 1337 return NO_MEMORY; 1338 } 1339 } else { 1340 mDataSize = desired; 1341 LOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize); 1342 if (mDataPos > desired) { 1343 mDataPos = desired; 1344 LOGV("continueWrite Setting data pos of %p to %d\n", this, mDataPos); 1345 } 1346 } 1347 1348 } else { 1349 // This is the first data. Easy! 1350 uint8_t* data = (uint8_t*)malloc(desired); 1351 if (!data) { 1352 mError = NO_MEMORY; 1353 return NO_MEMORY; 1354 } 1355 1356 if(!(mDataCapacity == 0 && mObjects == NULL 1357 && mObjectsCapacity == 0)) { 1358 LOGE("continueWrite: %d/%p/%d/%d", mDataCapacity, mObjects, mObjectsCapacity, desired); 1359 } 1360 1361 mData = data; 1362 mDataSize = mDataPos = 0; 1363 LOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize); 1364 LOGV("continueWrite Setting data pos of %p to %d\n", this, mDataPos); 1365 mDataCapacity = desired; 1366 } 1367 1368 return NO_ERROR; 1369 } 1370 1371 void Parcel::initState() 1372 { 1373 mError = NO_ERROR; 1374 mData = 0; 1375 mDataSize = 0; 1376 mDataCapacity = 0; 1377 mDataPos = 0; 1378 LOGV("initState Setting data size of %p to %d\n", this, mDataSize); 1379 LOGV("initState Setting data pos of %p to %d\n", this, mDataPos); 1380 mObjects = NULL; 1381 mObjectsSize = 0; 1382 mObjectsCapacity = 0; 1383 mNextObjectHint = 0; 1384 mHasFds = false; 1385 mFdsKnown = true; 1386 mOwner = NULL; 1387 } 1388 1389 void Parcel::scanForFds() const 1390 { 1391 bool hasFds = false; 1392 for (size_t i=0; i<mObjectsSize; i++) { 1393 const flat_binder_object* flat 1394 = reinterpret_cast<const flat_binder_object*>(mData + mObjects[i]); 1395 if (flat->type == BINDER_TYPE_FD) { 1396 hasFds = true; 1397 break; 1398 } 1399 } 1400 mHasFds = hasFds; 1401 mFdsKnown = true; 1402 } 1403 1404 }; // namespace android 1405
