Parcel.cpp revision 84a6d041e2c69d4d0b69269a0b59e725c9f119a3
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 32#include <private/binder/binder_module.h> 33 34#include <stdio.h> 35#include <stdlib.h> 36#include <stdint.h> 37 38#ifndef INT32_MAX 39#define INT32_MAX ((int32_t)(2147483647)) 40#endif 41 42#define LOG_REFS(...) 43//#define LOG_REFS(...) LOG(LOG_DEBUG, "Parcel", __VA_ARGS__) 44 45// --------------------------------------------------------------------------- 46 47#define PAD_SIZE(s) (((s)+3)&~3) 48 49// XXX This can be made public if we want to provide 50// support for typed data. 51struct small_flat_data 52{ 53 uint32_t type; 54 uint32_t data; 55}; 56 57namespace android { 58 59void acquire_object(const sp<ProcessState>& proc, 60 const flat_binder_object& obj, const void* who) 61{ 62 switch (obj.type) { 63 case BINDER_TYPE_BINDER: 64 if (obj.binder) { 65 LOG_REFS("Parcel %p acquiring reference on local %p", who, obj.cookie); 66 static_cast<IBinder*>(obj.cookie)->incStrong(who); 67 } 68 return; 69 case BINDER_TYPE_WEAK_BINDER: 70 if (obj.binder) 71 static_cast<RefBase::weakref_type*>(obj.binder)->incWeak(who); 72 return; 73 case BINDER_TYPE_HANDLE: { 74 const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle); 75 if (b != NULL) { 76 LOG_REFS("Parcel %p acquiring reference on remote %p", who, b.get()); 77 b->incStrong(who); 78 } 79 return; 80 } 81 case BINDER_TYPE_WEAK_HANDLE: { 82 const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle); 83 if (b != NULL) b.get_refs()->incWeak(who); 84 return; 85 } 86 case BINDER_TYPE_FD: { 87 // intentionally blank -- nothing to do to acquire this, but we do 88 // recognize it as a legitimate object type. 89 return; 90 } 91 } 92 93 LOGD("Invalid object type 0x%08lx", obj.type); 94} 95 96void release_object(const sp<ProcessState>& proc, 97 const flat_binder_object& obj, const void* who) 98{ 99 switch (obj.type) { 100 case BINDER_TYPE_BINDER: 101 if (obj.binder) { 102 LOG_REFS("Parcel %p releasing reference on local %p", who, obj.cookie); 103 static_cast<IBinder*>(obj.cookie)->decStrong(who); 104 } 105 return; 106 case BINDER_TYPE_WEAK_BINDER: 107 if (obj.binder) 108 static_cast<RefBase::weakref_type*>(obj.binder)->decWeak(who); 109 return; 110 case BINDER_TYPE_HANDLE: { 111 const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle); 112 if (b != NULL) { 113 LOG_REFS("Parcel %p releasing reference on remote %p", who, b.get()); 114 b->decStrong(who); 115 } 116 return; 117 } 118 case BINDER_TYPE_WEAK_HANDLE: { 119 const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle); 120 if (b != NULL) b.get_refs()->decWeak(who); 121 return; 122 } 123 case BINDER_TYPE_FD: { 124 if (obj.cookie != (void*)0) close(obj.handle); 125 return; 126 } 127 } 128 129 LOGE("Invalid object type 0x%08lx", obj.type); 130} 131 132inline static status_t finish_flatten_binder( 133 const sp<IBinder>& binder, const flat_binder_object& flat, Parcel* out) 134{ 135 return out->writeObject(flat, false); 136} 137 138status_t flatten_binder(const sp<ProcessState>& proc, 139 const sp<IBinder>& binder, Parcel* out) 140{ 141 flat_binder_object obj; 142 143 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 144 if (binder != NULL) { 145 IBinder *local = binder->localBinder(); 146 if (!local) { 147 BpBinder *proxy = binder->remoteBinder(); 148 if (proxy == NULL) { 149 LOGE("null proxy"); 150 } 151 const int32_t handle = proxy ? proxy->handle() : 0; 152 obj.type = BINDER_TYPE_HANDLE; 153 obj.handle = handle; 154 obj.cookie = NULL; 155 } else { 156 obj.type = BINDER_TYPE_BINDER; 157 obj.binder = local->getWeakRefs(); 158 obj.cookie = local; 159 } 160 } else { 161 obj.type = BINDER_TYPE_BINDER; 162 obj.binder = NULL; 163 obj.cookie = NULL; 164 } 165 166 return finish_flatten_binder(binder, obj, out); 167} 168 169status_t flatten_binder(const sp<ProcessState>& proc, 170 const wp<IBinder>& binder, Parcel* out) 171{ 172 flat_binder_object obj; 173 174 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 175 if (binder != NULL) { 176 sp<IBinder> real = binder.promote(); 177 if (real != NULL) { 178 IBinder *local = real->localBinder(); 179 if (!local) { 180 BpBinder *proxy = real->remoteBinder(); 181 if (proxy == NULL) { 182 LOGE("null proxy"); 183 } 184 const int32_t handle = proxy ? proxy->handle() : 0; 185 obj.type = BINDER_TYPE_WEAK_HANDLE; 186 obj.handle = handle; 187 obj.cookie = NULL; 188 } else { 189 obj.type = BINDER_TYPE_WEAK_BINDER; 190 obj.binder = binder.get_refs(); 191 obj.cookie = binder.unsafe_get(); 192 } 193 return finish_flatten_binder(real, obj, out); 194 } 195 196 // XXX How to deal? In order to flatten the given binder, 197 // we need to probe it for information, which requires a primary 198 // reference... but we don't have one. 199 // 200 // The OpenBinder implementation uses a dynamic_cast<> here, 201 // but we can't do that with the different reference counting 202 // implementation we are using. 203 LOGE("Unable to unflatten Binder weak reference!"); 204 obj.type = BINDER_TYPE_BINDER; 205 obj.binder = NULL; 206 obj.cookie = NULL; 207 return finish_flatten_binder(NULL, obj, out); 208 209 } else { 210 obj.type = BINDER_TYPE_BINDER; 211 obj.binder = NULL; 212 obj.cookie = NULL; 213 return finish_flatten_binder(NULL, obj, out); 214 } 215} 216 217inline static status_t finish_unflatten_binder( 218 BpBinder* proxy, const flat_binder_object& flat, const Parcel& in) 219{ 220 return NO_ERROR; 221} 222 223status_t unflatten_binder(const sp<ProcessState>& proc, 224 const Parcel& in, sp<IBinder>* out) 225{ 226 const flat_binder_object* flat = in.readObject(false); 227 228 if (flat) { 229 switch (flat->type) { 230 case BINDER_TYPE_BINDER: 231 *out = static_cast<IBinder*>(flat->cookie); 232 return finish_unflatten_binder(NULL, *flat, in); 233 case BINDER_TYPE_HANDLE: 234 *out = proc->getStrongProxyForHandle(flat->handle); 235 return finish_unflatten_binder( 236 static_cast<BpBinder*>(out->get()), *flat, in); 237 } 238 } 239 return BAD_TYPE; 240} 241 242status_t unflatten_binder(const sp<ProcessState>& proc, 243 const Parcel& in, wp<IBinder>* out) 244{ 245 const flat_binder_object* flat = in.readObject(false); 246 247 if (flat) { 248 switch (flat->type) { 249 case BINDER_TYPE_BINDER: 250 *out = static_cast<IBinder*>(flat->cookie); 251 return finish_unflatten_binder(NULL, *flat, in); 252 case BINDER_TYPE_WEAK_BINDER: 253 if (flat->binder != NULL) { 254 out->set_object_and_refs( 255 static_cast<IBinder*>(flat->cookie), 256 static_cast<RefBase::weakref_type*>(flat->binder)); 257 } else { 258 *out = NULL; 259 } 260 return finish_unflatten_binder(NULL, *flat, in); 261 case BINDER_TYPE_HANDLE: 262 case BINDER_TYPE_WEAK_HANDLE: 263 *out = proc->getWeakProxyForHandle(flat->handle); 264 return finish_unflatten_binder( 265 static_cast<BpBinder*>(out->unsafe_get()), *flat, in); 266 } 267 } 268 return BAD_TYPE; 269} 270 271// --------------------------------------------------------------------------- 272 273Parcel::Parcel() 274{ 275 initState(); 276} 277 278Parcel::~Parcel() 279{ 280 freeDataNoInit(); 281} 282 283const uint8_t* Parcel::data() const 284{ 285 return mData; 286} 287 288size_t Parcel::dataSize() const 289{ 290 return (mDataSize > mDataPos ? mDataSize : mDataPos); 291} 292 293size_t Parcel::dataAvail() const 294{ 295 // TODO: decide what to do about the possibility that this can 296 // report an available-data size that exceeds a Java int's max 297 // positive value, causing havoc. Fortunately this will only 298 // happen if someone constructs a Parcel containing more than two 299 // gigabytes of data, which on typical phone hardware is simply 300 // not possible. 301 return dataSize() - dataPosition(); 302} 303 304size_t Parcel::dataPosition() const 305{ 306 return mDataPos; 307} 308 309size_t Parcel::dataCapacity() const 310{ 311 return mDataCapacity; 312} 313 314status_t Parcel::setDataSize(size_t size) 315{ 316 status_t err; 317 err = continueWrite(size); 318 if (err == NO_ERROR) { 319 mDataSize = size; 320 LOGV("setDataSize Setting data size of %p to %d\n", this, mDataSize); 321 } 322 return err; 323} 324 325void Parcel::setDataPosition(size_t pos) const 326{ 327 mDataPos = pos; 328 mNextObjectHint = 0; 329} 330 331status_t Parcel::setDataCapacity(size_t size) 332{ 333 if (size > mDataSize) return continueWrite(size); 334 return NO_ERROR; 335} 336 337status_t Parcel::setData(const uint8_t* buffer, size_t len) 338{ 339 status_t err = restartWrite(len); 340 if (err == NO_ERROR) { 341 memcpy(const_cast<uint8_t*>(data()), buffer, len); 342 mDataSize = len; 343 mFdsKnown = false; 344 } 345 return err; 346} 347 348status_t Parcel::appendFrom(Parcel *parcel, size_t offset, size_t len) 349{ 350 const sp<ProcessState> proc(ProcessState::self()); 351 status_t err; 352 uint8_t *data = parcel->mData; 353 size_t *objects = parcel->mObjects; 354 size_t size = parcel->mObjectsSize; 355 int startPos = mDataPos; 356 int firstIndex = -1, lastIndex = -2; 357 358 if (len == 0) { 359 return NO_ERROR; 360 } 361 362 // range checks against the source parcel size 363 if ((offset > parcel->mDataSize) 364 || (len > parcel->mDataSize) 365 || (offset + len > parcel->mDataSize)) { 366 return BAD_VALUE; 367 } 368 369 // Count objects in range 370 for (int i = 0; i < (int) size; i++) { 371 size_t off = objects[i]; 372 if ((off >= offset) && (off < offset + len)) { 373 if (firstIndex == -1) { 374 firstIndex = i; 375 } 376 lastIndex = i; 377 } 378 } 379 int numObjects = lastIndex - firstIndex + 1; 380 381 // grow data 382 err = growData(len); 383 if (err != NO_ERROR) { 384 return err; 385 } 386 387 // append data 388 memcpy(mData + mDataPos, data + offset, len); 389 mDataPos += len; 390 mDataSize += len; 391 392 if (numObjects > 0) { 393 // grow objects 394 if (mObjectsCapacity < mObjectsSize + numObjects) { 395 int newSize = ((mObjectsSize + numObjects)*3)/2; 396 size_t *objects = 397 (size_t*)realloc(mObjects, newSize*sizeof(size_t)); 398 if (objects == (size_t*)0) { 399 return NO_MEMORY; 400 } 401 mObjects = objects; 402 mObjectsCapacity = newSize; 403 } 404 405 // append and acquire objects 406 int idx = mObjectsSize; 407 for (int i = firstIndex; i <= lastIndex; i++) { 408 size_t off = objects[i] - offset + startPos; 409 mObjects[idx++] = off; 410 mObjectsSize++; 411 412 flat_binder_object* flat 413 = reinterpret_cast<flat_binder_object*>(mData + off); 414 acquire_object(proc, *flat, this); 415 416 if (flat->type == BINDER_TYPE_FD) { 417 // If this is a file descriptor, we need to dup it so the 418 // new Parcel now owns its own fd, and can declare that we 419 // officially know we have fds. 420 flat->handle = dup(flat->handle); 421 flat->cookie = (void*)1; 422 mHasFds = mFdsKnown = true; 423 } 424 } 425 } 426 427 return NO_ERROR; 428} 429 430bool Parcel::hasFileDescriptors() const 431{ 432 if (!mFdsKnown) { 433 scanForFds(); 434 } 435 return mHasFds; 436} 437 438status_t Parcel::writeInterfaceToken(const String16& interface) 439{ 440 // currently the interface identification token is just its name as a string 441 return writeString16(interface); 442} 443 444bool Parcel::checkInterface(IBinder* binder) const 445{ 446 return enforceInterface(binder->getInterfaceDescriptor()); 447} 448 449bool Parcel::enforceInterface(const String16& interface) const 450{ 451 const String16 str(readString16()); 452 if (str == interface) { 453 return true; 454 } else { 455 LOGW("**** enforceInterface() expected '%s' but read '%s'\n", 456 String8(interface).string(), String8(str).string()); 457 return false; 458 } 459} 460 461const size_t* Parcel::objects() const 462{ 463 return mObjects; 464} 465 466size_t Parcel::objectsCount() const 467{ 468 return mObjectsSize; 469} 470 471status_t Parcel::errorCheck() const 472{ 473 return mError; 474} 475 476void Parcel::setError(status_t err) 477{ 478 mError = err; 479} 480 481status_t Parcel::finishWrite(size_t len) 482{ 483 //printf("Finish write of %d\n", len); 484 mDataPos += len; 485 LOGV("finishWrite Setting data pos of %p to %d\n", this, mDataPos); 486 if (mDataPos > mDataSize) { 487 mDataSize = mDataPos; 488 LOGV("finishWrite Setting data size of %p to %d\n", this, mDataSize); 489 } 490 //printf("New pos=%d, size=%d\n", mDataPos, mDataSize); 491 return NO_ERROR; 492} 493 494status_t Parcel::writeUnpadded(const void* data, size_t len) 495{ 496 size_t end = mDataPos + len; 497 if (end < mDataPos) { 498 // integer overflow 499 return BAD_VALUE; 500 } 501 502 if (end <= mDataCapacity) { 503restart_write: 504 memcpy(mData+mDataPos, data, len); 505 return finishWrite(len); 506 } 507 508 status_t err = growData(len); 509 if (err == NO_ERROR) goto restart_write; 510 return err; 511} 512 513status_t Parcel::write(const void* data, size_t len) 514{ 515 void* const d = writeInplace(len); 516 if (d) { 517 memcpy(d, data, len); 518 return NO_ERROR; 519 } 520 return mError; 521} 522 523void* Parcel::writeInplace(size_t len) 524{ 525 const size_t padded = PAD_SIZE(len); 526 527 // sanity check for integer overflow 528 if (mDataPos+padded < mDataPos) { 529 return NULL; 530 } 531 532 if ((mDataPos+padded) <= mDataCapacity) { 533restart_write: 534 //printf("Writing %ld bytes, padded to %ld\n", len, padded); 535 uint8_t* const data = mData+mDataPos; 536 537 // Need to pad at end? 538 if (padded != len) { 539#if BYTE_ORDER == BIG_ENDIAN 540 static const uint32_t mask[4] = { 541 0x00000000, 0xffffff00, 0xffff0000, 0xff000000 542 }; 543#endif 544#if BYTE_ORDER == LITTLE_ENDIAN 545 static const uint32_t mask[4] = { 546 0x00000000, 0x00ffffff, 0x0000ffff, 0x000000ff 547 }; 548#endif 549 //printf("Applying pad mask: %p to %p\n", (void*)mask[padded-len], 550 // *reinterpret_cast<void**>(data+padded-4)); 551 *reinterpret_cast<uint32_t*>(data+padded-4) &= mask[padded-len]; 552 } 553 554 finishWrite(padded); 555 return data; 556 } 557 558 status_t err = growData(padded); 559 if (err == NO_ERROR) goto restart_write; 560 return NULL; 561} 562 563status_t Parcel::writeInt32(int32_t val) 564{ 565 return writeAligned(val); 566} 567 568status_t Parcel::writeInt64(int64_t val) 569{ 570 return writeAligned(val); 571} 572 573status_t Parcel::writeFloat(float val) 574{ 575 return writeAligned(val); 576} 577 578status_t Parcel::writeDouble(double val) 579{ 580 return writeAligned(val); 581} 582 583status_t Parcel::writeIntPtr(intptr_t val) 584{ 585 return writeAligned(val); 586} 587 588status_t Parcel::writeCString(const char* str) 589{ 590 return write(str, strlen(str)+1); 591} 592 593status_t Parcel::writeString8(const String8& str) 594{ 595 status_t err = writeInt32(str.bytes()); 596 if (err == NO_ERROR) { 597 err = write(str.string(), str.bytes()+1); 598 } 599 return err; 600} 601 602status_t Parcel::writeString16(const String16& str) 603{ 604 return writeString16(str.string(), str.size()); 605} 606 607status_t Parcel::writeString16(const char16_t* str, size_t len) 608{ 609 if (str == NULL) return writeInt32(-1); 610 611 status_t err = writeInt32(len); 612 if (err == NO_ERROR) { 613 len *= sizeof(char16_t); 614 uint8_t* data = (uint8_t*)writeInplace(len+sizeof(char16_t)); 615 if (data) { 616 memcpy(data, str, len); 617 *reinterpret_cast<char16_t*>(data+len) = 0; 618 return NO_ERROR; 619 } 620 err = mError; 621 } 622 return err; 623} 624 625status_t Parcel::writeStrongBinder(const sp<IBinder>& val) 626{ 627 return flatten_binder(ProcessState::self(), val, this); 628} 629 630status_t Parcel::writeWeakBinder(const wp<IBinder>& val) 631{ 632 return flatten_binder(ProcessState::self(), val, this); 633} 634 635status_t Parcel::writeNativeHandle(const native_handle* handle) 636{ 637 if (!handle || handle->version != sizeof(native_handle)) 638 return BAD_TYPE; 639 640 status_t err; 641 err = writeInt32(handle->numFds); 642 if (err != NO_ERROR) return err; 643 644 err = writeInt32(handle->numInts); 645 if (err != NO_ERROR) return err; 646 647 for (int i=0 ; err==NO_ERROR && i<handle->numFds ; i++) 648 err = writeDupFileDescriptor(handle->data[i]); 649 650 if (err != NO_ERROR) { 651 LOGD("write native handle, write dup fd failed"); 652 return err; 653 } 654 err = write(handle->data + handle->numFds, sizeof(int)*handle->numInts); 655 return err; 656} 657 658status_t Parcel::writeFileDescriptor(int fd) 659{ 660 flat_binder_object obj; 661 obj.type = BINDER_TYPE_FD; 662 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 663 obj.handle = fd; 664 obj.cookie = (void*)0; 665 return writeObject(obj, true); 666} 667 668status_t Parcel::writeDupFileDescriptor(int fd) 669{ 670 flat_binder_object obj; 671 obj.type = BINDER_TYPE_FD; 672 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 673 obj.handle = dup(fd); 674 obj.cookie = (void*)1; 675 return writeObject(obj, true); 676} 677 678status_t Parcel::writeObject(const flat_binder_object& val, bool nullMetaData) 679{ 680 const bool enoughData = (mDataPos+sizeof(val)) <= mDataCapacity; 681 const bool enoughObjects = mObjectsSize < mObjectsCapacity; 682 if (enoughData && enoughObjects) { 683restart_write: 684 *reinterpret_cast<flat_binder_object*>(mData+mDataPos) = val; 685 686 // Need to write meta-data? 687 if (nullMetaData || val.binder != NULL) { 688 mObjects[mObjectsSize] = mDataPos; 689 acquire_object(ProcessState::self(), val, this); 690 mObjectsSize++; 691 } 692 693 // remember if it's a file descriptor 694 if (val.type == BINDER_TYPE_FD) { 695 mHasFds = mFdsKnown = true; 696 } 697 698 return finishWrite(sizeof(flat_binder_object)); 699 } 700 701 if (!enoughData) { 702 const status_t err = growData(sizeof(val)); 703 if (err != NO_ERROR) return err; 704 } 705 if (!enoughObjects) { 706 size_t newSize = ((mObjectsSize+2)*3)/2; 707 size_t* objects = (size_t*)realloc(mObjects, newSize*sizeof(size_t)); 708 if (objects == NULL) return NO_MEMORY; 709 mObjects = objects; 710 mObjectsCapacity = newSize; 711 } 712 713 goto restart_write; 714} 715 716 717void Parcel::remove(size_t start, size_t amt) 718{ 719 LOG_ALWAYS_FATAL("Parcel::remove() not yet implemented!"); 720} 721 722status_t Parcel::read(void* outData, size_t len) const 723{ 724 if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize) { 725 memcpy(outData, mData+mDataPos, len); 726 mDataPos += PAD_SIZE(len); 727 LOGV("read Setting data pos of %p to %d\n", this, mDataPos); 728 return NO_ERROR; 729 } 730 return NOT_ENOUGH_DATA; 731} 732 733const void* Parcel::readInplace(size_t len) const 734{ 735 if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize) { 736 const void* data = mData+mDataPos; 737 mDataPos += PAD_SIZE(len); 738 LOGV("readInplace Setting data pos of %p to %d\n", this, mDataPos); 739 return data; 740 } 741 return NULL; 742} 743 744template<class T> 745status_t Parcel::readAligned(T *pArg) const { 746 COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T)); 747 748 if ((mDataPos+sizeof(T)) <= mDataSize) { 749 const void* data = mData+mDataPos; 750 mDataPos += sizeof(T); 751 *pArg = *reinterpret_cast<const T*>(data); 752 return NO_ERROR; 753 } else { 754 return NOT_ENOUGH_DATA; 755 } 756} 757 758template<class T> 759T Parcel::readAligned() const { 760 T result; 761 if (readAligned(&result) != NO_ERROR) { 762 result = 0; 763 } 764 765 return result; 766} 767 768template<class T> 769status_t Parcel::writeAligned(T val) { 770 COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T)); 771 772 if ((mDataPos+sizeof(val)) <= mDataCapacity) { 773restart_write: 774 *reinterpret_cast<T*>(mData+mDataPos) = val; 775 return finishWrite(sizeof(val)); 776 } 777 778 status_t err = growData(sizeof(val)); 779 if (err == NO_ERROR) goto restart_write; 780 return err; 781} 782 783status_t Parcel::readInt32(int32_t *pArg) const 784{ 785 return readAligned(pArg); 786} 787 788int32_t Parcel::readInt32() const 789{ 790 return readAligned<int32_t>(); 791} 792 793 794status_t Parcel::readInt64(int64_t *pArg) const 795{ 796 return readAligned(pArg); 797} 798 799 800int64_t Parcel::readInt64() const 801{ 802 return readAligned<int64_t>(); 803} 804 805status_t Parcel::readFloat(float *pArg) const 806{ 807 return readAligned(pArg); 808} 809 810 811float Parcel::readFloat() const 812{ 813 return readAligned<float>(); 814} 815 816status_t Parcel::readDouble(double *pArg) const 817{ 818 return readAligned(pArg); 819} 820 821 822double Parcel::readDouble() const 823{ 824 return readAligned<double>(); 825} 826 827status_t Parcel::readIntPtr(intptr_t *pArg) const 828{ 829 return readAligned(pArg); 830} 831 832 833intptr_t Parcel::readIntPtr() const 834{ 835 return readAligned<intptr_t>(); 836} 837 838 839const char* Parcel::readCString() const 840{ 841 const size_t avail = mDataSize-mDataPos; 842 if (avail > 0) { 843 const char* str = reinterpret_cast<const char*>(mData+mDataPos); 844 // is the string's trailing NUL within the parcel's valid bounds? 845 const char* eos = reinterpret_cast<const char*>(memchr(str, 0, avail)); 846 if (eos) { 847 const size_t len = eos - str; 848 mDataPos += PAD_SIZE(len+1); 849 LOGV("readCString Setting data pos of %p to %d\n", this, mDataPos); 850 return str; 851 } 852 } 853 return NULL; 854} 855 856String8 Parcel::readString8() const 857{ 858 int32_t size = readInt32(); 859 // watch for potential int overflow adding 1 for trailing NUL 860 if (size > 0 && size < INT32_MAX) { 861 const char* str = (const char*)readInplace(size+1); 862 if (str) return String8(str, size); 863 } 864 return String8(); 865} 866 867String16 Parcel::readString16() const 868{ 869 size_t len; 870 const char16_t* str = readString16Inplace(&len); 871 if (str) return String16(str, len); 872 LOGE("Reading a NULL string not supported here."); 873 return String16(); 874} 875 876const char16_t* Parcel::readString16Inplace(size_t* outLen) const 877{ 878 int32_t size = readInt32(); 879 // watch for potential int overflow from size+1 880 if (size >= 0 && size < INT32_MAX) { 881 *outLen = size; 882 const char16_t* str = (const char16_t*)readInplace((size+1)*sizeof(char16_t)); 883 if (str != NULL) { 884 return str; 885 } 886 } 887 *outLen = 0; 888 return NULL; 889} 890 891sp<IBinder> Parcel::readStrongBinder() const 892{ 893 sp<IBinder> val; 894 unflatten_binder(ProcessState::self(), *this, &val); 895 return val; 896} 897 898wp<IBinder> Parcel::readWeakBinder() const 899{ 900 wp<IBinder> val; 901 unflatten_binder(ProcessState::self(), *this, &val); 902 return val; 903} 904 905 906native_handle* Parcel::readNativeHandle() const 907{ 908 int numFds, numInts; 909 status_t err; 910 err = readInt32(&numFds); 911 if (err != NO_ERROR) return 0; 912 err = readInt32(&numInts); 913 if (err != NO_ERROR) return 0; 914 915 native_handle* h = native_handle_create(numFds, numInts); 916 for (int i=0 ; err==NO_ERROR && i<numFds ; i++) { 917 h->data[i] = dup(readFileDescriptor()); 918 if (h->data[i] < 0) err = BAD_VALUE; 919 } 920 err = read(h->data + numFds, sizeof(int)*numInts); 921 if (err != NO_ERROR) { 922 native_handle_close(h); 923 native_handle_delete(h); 924 h = 0; 925 } 926 return h; 927} 928 929 930int Parcel::readFileDescriptor() const 931{ 932 const flat_binder_object* flat = readObject(true); 933 if (flat) { 934 switch (flat->type) { 935 case BINDER_TYPE_FD: 936 //LOGI("Returning file descriptor %ld from parcel %p\n", flat->handle, this); 937 return flat->handle; 938 } 939 } 940 return BAD_TYPE; 941} 942 943const flat_binder_object* Parcel::readObject(bool nullMetaData) const 944{ 945 const size_t DPOS = mDataPos; 946 if ((DPOS+sizeof(flat_binder_object)) <= mDataSize) { 947 const flat_binder_object* obj 948 = reinterpret_cast<const flat_binder_object*>(mData+DPOS); 949 mDataPos = DPOS + sizeof(flat_binder_object); 950 if (!nullMetaData && (obj->cookie == NULL && obj->binder == NULL)) { 951 // When transferring a NULL object, we don't write it into 952 // the object list, so we don't want to check for it when 953 // reading. 954 LOGV("readObject Setting data pos of %p to %d\n", this, mDataPos); 955 return obj; 956 } 957 958 // Ensure that this object is valid... 959 size_t* const OBJS = mObjects; 960 const size_t N = mObjectsSize; 961 size_t opos = mNextObjectHint; 962 963 if (N > 0) { 964 LOGV("Parcel %p looking for obj at %d, hint=%d\n", 965 this, DPOS, opos); 966 967 // Start at the current hint position, looking for an object at 968 // the current data position. 969 if (opos < N) { 970 while (opos < (N-1) && OBJS[opos] < DPOS) { 971 opos++; 972 } 973 } else { 974 opos = N-1; 975 } 976 if (OBJS[opos] == DPOS) { 977 // Found it! 978 LOGV("Parcel found obj %d at index %d with forward search", 979 this, DPOS, opos); 980 mNextObjectHint = opos+1; 981 LOGV("readObject Setting data pos of %p to %d\n", this, mDataPos); 982 return obj; 983 } 984 985 // Look backwards for it... 986 while (opos > 0 && OBJS[opos] > DPOS) { 987 opos--; 988 } 989 if (OBJS[opos] == DPOS) { 990 // Found it! 991 LOGV("Parcel found obj %d at index %d with backward search", 992 this, DPOS, opos); 993 mNextObjectHint = opos+1; 994 LOGV("readObject Setting data pos of %p to %d\n", this, mDataPos); 995 return obj; 996 } 997 } 998 LOGW("Attempt to read object from Parcel %p at offset %d that is not in the object list", 999 this, DPOS); 1000 } 1001 return NULL; 1002} 1003 1004void Parcel::closeFileDescriptors() 1005{ 1006 size_t i = mObjectsSize; 1007 if (i > 0) { 1008 //LOGI("Closing file descriptors for %d objects...", mObjectsSize); 1009 } 1010 while (i > 0) { 1011 i--; 1012 const flat_binder_object* flat 1013 = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]); 1014 if (flat->type == BINDER_TYPE_FD) { 1015 //LOGI("Closing fd: %ld\n", flat->handle); 1016 close(flat->handle); 1017 } 1018 } 1019} 1020 1021const uint8_t* Parcel::ipcData() const 1022{ 1023 return mData; 1024} 1025 1026size_t Parcel::ipcDataSize() const 1027{ 1028 return (mDataSize > mDataPos ? mDataSize : mDataPos); 1029} 1030 1031const size_t* Parcel::ipcObjects() const 1032{ 1033 return mObjects; 1034} 1035 1036size_t Parcel::ipcObjectsCount() const 1037{ 1038 return mObjectsSize; 1039} 1040 1041void Parcel::ipcSetDataReference(const uint8_t* data, size_t dataSize, 1042 const size_t* objects, size_t objectsCount, release_func relFunc, void* relCookie) 1043{ 1044 freeDataNoInit(); 1045 mError = NO_ERROR; 1046 mData = const_cast<uint8_t*>(data); 1047 mDataSize = mDataCapacity = dataSize; 1048 //LOGI("setDataReference Setting data size of %p to %lu (pid=%d)\n", this, mDataSize, getpid()); 1049 mDataPos = 0; 1050 LOGV("setDataReference Setting data pos of %p to %d\n", this, mDataPos); 1051 mObjects = const_cast<size_t*>(objects); 1052 mObjectsSize = mObjectsCapacity = objectsCount; 1053 mNextObjectHint = 0; 1054 mOwner = relFunc; 1055 mOwnerCookie = relCookie; 1056 scanForFds(); 1057} 1058 1059void Parcel::print(TextOutput& to, uint32_t flags) const 1060{ 1061 to << "Parcel("; 1062 1063 if (errorCheck() != NO_ERROR) { 1064 const status_t err = errorCheck(); 1065 to << "Error: " << (void*)err << " \"" << strerror(-err) << "\""; 1066 } else if (dataSize() > 0) { 1067 const uint8_t* DATA = data(); 1068 to << indent << HexDump(DATA, dataSize()) << dedent; 1069 const size_t* OBJS = objects(); 1070 const size_t N = objectsCount(); 1071 for (size_t i=0; i<N; i++) { 1072 const flat_binder_object* flat 1073 = reinterpret_cast<const flat_binder_object*>(DATA+OBJS[i]); 1074 to << endl << "Object #" << i << " @ " << (void*)OBJS[i] << ": " 1075 << TypeCode(flat->type & 0x7f7f7f00) 1076 << " = " << flat->binder; 1077 } 1078 } else { 1079 to << "NULL"; 1080 } 1081 1082 to << ")"; 1083} 1084 1085void Parcel::releaseObjects() 1086{ 1087 const sp<ProcessState> proc(ProcessState::self()); 1088 size_t i = mObjectsSize; 1089 uint8_t* const data = mData; 1090 size_t* const objects = mObjects; 1091 while (i > 0) { 1092 i--; 1093 const flat_binder_object* flat 1094 = reinterpret_cast<flat_binder_object*>(data+objects[i]); 1095 release_object(proc, *flat, this); 1096 } 1097} 1098 1099void Parcel::acquireObjects() 1100{ 1101 const sp<ProcessState> proc(ProcessState::self()); 1102 size_t i = mObjectsSize; 1103 uint8_t* const data = mData; 1104 size_t* const objects = mObjects; 1105 while (i > 0) { 1106 i--; 1107 const flat_binder_object* flat 1108 = reinterpret_cast<flat_binder_object*>(data+objects[i]); 1109 acquire_object(proc, *flat, this); 1110 } 1111} 1112 1113void Parcel::freeData() 1114{ 1115 freeDataNoInit(); 1116 initState(); 1117} 1118 1119void Parcel::freeDataNoInit() 1120{ 1121 if (mOwner) { 1122 //LOGI("Freeing data ref of %p (pid=%d)\n", this, getpid()); 1123 mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie); 1124 } else { 1125 releaseObjects(); 1126 if (mData) free(mData); 1127 if (mObjects) free(mObjects); 1128 } 1129} 1130 1131status_t Parcel::growData(size_t len) 1132{ 1133 size_t newSize = ((mDataSize+len)*3)/2; 1134 return (newSize <= mDataSize) 1135 ? (status_t) NO_MEMORY 1136 : continueWrite(newSize); 1137} 1138 1139status_t Parcel::restartWrite(size_t desired) 1140{ 1141 if (mOwner) { 1142 freeData(); 1143 return continueWrite(desired); 1144 } 1145 1146 uint8_t* data = (uint8_t*)realloc(mData, desired); 1147 if (!data && desired > mDataCapacity) { 1148 mError = NO_MEMORY; 1149 return NO_MEMORY; 1150 } 1151 1152 releaseObjects(); 1153 1154 if (data) { 1155 mData = data; 1156 mDataCapacity = desired; 1157 } 1158 1159 mDataSize = mDataPos = 0; 1160 LOGV("restartWrite Setting data size of %p to %d\n", this, mDataSize); 1161 LOGV("restartWrite Setting data pos of %p to %d\n", this, mDataPos); 1162 1163 free(mObjects); 1164 mObjects = NULL; 1165 mObjectsSize = mObjectsCapacity = 0; 1166 mNextObjectHint = 0; 1167 mHasFds = false; 1168 mFdsKnown = true; 1169 1170 return NO_ERROR; 1171} 1172 1173status_t Parcel::continueWrite(size_t desired) 1174{ 1175 // If shrinking, first adjust for any objects that appear 1176 // after the new data size. 1177 size_t objectsSize = mObjectsSize; 1178 if (desired < mDataSize) { 1179 if (desired == 0) { 1180 objectsSize = 0; 1181 } else { 1182 while (objectsSize > 0) { 1183 if (mObjects[objectsSize-1] < desired) 1184 break; 1185 objectsSize--; 1186 } 1187 } 1188 } 1189 1190 if (mOwner) { 1191 // If the size is going to zero, just release the owner's data. 1192 if (desired == 0) { 1193 freeData(); 1194 return NO_ERROR; 1195 } 1196 1197 // If there is a different owner, we need to take 1198 // posession. 1199 uint8_t* data = (uint8_t*)malloc(desired); 1200 if (!data) { 1201 mError = NO_MEMORY; 1202 return NO_MEMORY; 1203 } 1204 size_t* objects = NULL; 1205 1206 if (objectsSize) { 1207 objects = (size_t*)malloc(objectsSize*sizeof(size_t)); 1208 if (!objects) { 1209 mError = NO_MEMORY; 1210 return NO_MEMORY; 1211 } 1212 1213 // Little hack to only acquire references on objects 1214 // we will be keeping. 1215 size_t oldObjectsSize = mObjectsSize; 1216 mObjectsSize = objectsSize; 1217 acquireObjects(); 1218 mObjectsSize = oldObjectsSize; 1219 } 1220 1221 if (mData) { 1222 memcpy(data, mData, mDataSize < desired ? mDataSize : desired); 1223 } 1224 if (objects && mObjects) { 1225 memcpy(objects, mObjects, objectsSize*sizeof(size_t)); 1226 } 1227 //LOGI("Freeing data ref of %p (pid=%d)\n", this, getpid()); 1228 mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie); 1229 mOwner = NULL; 1230 1231 mData = data; 1232 mObjects = objects; 1233 mDataSize = (mDataSize < desired) ? mDataSize : desired; 1234 LOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize); 1235 mDataCapacity = desired; 1236 mObjectsSize = mObjectsCapacity = objectsSize; 1237 mNextObjectHint = 0; 1238 1239 } else if (mData) { 1240 if (objectsSize < mObjectsSize) { 1241 // Need to release refs on any objects we are dropping. 1242 const sp<ProcessState> proc(ProcessState::self()); 1243 for (size_t i=objectsSize; i<mObjectsSize; i++) { 1244 const flat_binder_object* flat 1245 = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]); 1246 if (flat->type == BINDER_TYPE_FD) { 1247 // will need to rescan because we may have lopped off the only FDs 1248 mFdsKnown = false; 1249 } 1250 release_object(proc, *flat, this); 1251 } 1252 size_t* objects = 1253 (size_t*)realloc(mObjects, objectsSize*sizeof(size_t)); 1254 if (objects) { 1255 mObjects = objects; 1256 } 1257 mObjectsSize = objectsSize; 1258 mNextObjectHint = 0; 1259 } 1260 1261 // We own the data, so we can just do a realloc(). 1262 if (desired > mDataCapacity) { 1263 uint8_t* data = (uint8_t*)realloc(mData, desired); 1264 if (data) { 1265 mData = data; 1266 mDataCapacity = desired; 1267 } else if (desired > mDataCapacity) { 1268 mError = NO_MEMORY; 1269 return NO_MEMORY; 1270 } 1271 } else { 1272 mDataSize = desired; 1273 LOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize); 1274 if (mDataPos > desired) { 1275 mDataPos = desired; 1276 LOGV("continueWrite Setting data pos of %p to %d\n", this, mDataPos); 1277 } 1278 } 1279 1280 } else { 1281 // This is the first data. Easy! 1282 uint8_t* data = (uint8_t*)malloc(desired); 1283 if (!data) { 1284 mError = NO_MEMORY; 1285 return NO_MEMORY; 1286 } 1287 1288 if(!(mDataCapacity == 0 && mObjects == NULL 1289 && mObjectsCapacity == 0)) { 1290 LOGE("continueWrite: %d/%p/%d/%d", mDataCapacity, mObjects, mObjectsCapacity, desired); 1291 } 1292 1293 mData = data; 1294 mDataSize = mDataPos = 0; 1295 LOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize); 1296 LOGV("continueWrite Setting data pos of %p to %d\n", this, mDataPos); 1297 mDataCapacity = desired; 1298 } 1299 1300 return NO_ERROR; 1301} 1302 1303void Parcel::initState() 1304{ 1305 mError = NO_ERROR; 1306 mData = 0; 1307 mDataSize = 0; 1308 mDataCapacity = 0; 1309 mDataPos = 0; 1310 LOGV("initState Setting data size of %p to %d\n", this, mDataSize); 1311 LOGV("initState Setting data pos of %p to %d\n", this, mDataPos); 1312 mObjects = NULL; 1313 mObjectsSize = 0; 1314 mObjectsCapacity = 0; 1315 mNextObjectHint = 0; 1316 mHasFds = false; 1317 mFdsKnown = true; 1318 mOwner = NULL; 1319} 1320 1321void Parcel::scanForFds() const 1322{ 1323 bool hasFds = false; 1324 for (size_t i=0; i<mObjectsSize; i++) { 1325 const flat_binder_object* flat 1326 = reinterpret_cast<const flat_binder_object*>(mData + mObjects[i]); 1327 if (flat->type == BINDER_TYPE_FD) { 1328 hasFds = true; 1329 break; 1330 } 1331 } 1332 mHasFds = hasFds; 1333 mFdsKnown = true; 1334} 1335 1336}; // namespace android 1337