Parcel.cpp revision 702ea9d42f52fc145090c0f0bfbe64993e4b8b33
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/IPCThreadState.h> 23#include <binder/Binder.h> 24#include <binder/BpBinder.h> 25#include <utils/Debug.h> 26#include <binder/ProcessState.h> 27#include <utils/Log.h> 28#include <utils/String8.h> 29#include <utils/String16.h> 30#include <utils/TextOutput.h> 31#include <utils/misc.h> 32#include <utils/Flattenable.h> 33 34#include <private/binder/binder_module.h> 35 36#include <stdio.h> 37#include <stdlib.h> 38#include <stdint.h> 39 40#ifndef INT32_MAX 41#define INT32_MAX ((int32_t)(2147483647)) 42#endif 43 44#define LOG_REFS(...) 45//#define LOG_REFS(...) LOG(LOG_DEBUG, "Parcel", __VA_ARGS__) 46 47// --------------------------------------------------------------------------- 48 49#define PAD_SIZE(s) (((s)+3)&~3) 50 51// XXX This can be made public if we want to provide 52// support for typed data. 53struct small_flat_data 54{ 55 uint32_t type; 56 uint32_t data; 57}; 58 59namespace android { 60 61void acquire_object(const sp<ProcessState>& proc, 62 const flat_binder_object& obj, const void* who) 63{ 64 switch (obj.type) { 65 case BINDER_TYPE_BINDER: 66 if (obj.binder) { 67 LOG_REFS("Parcel %p acquiring reference on local %p", who, obj.cookie); 68 static_cast<IBinder*>(obj.cookie)->incStrong(who); 69 } 70 return; 71 case BINDER_TYPE_WEAK_BINDER: 72 if (obj.binder) 73 static_cast<RefBase::weakref_type*>(obj.binder)->incWeak(who); 74 return; 75 case BINDER_TYPE_HANDLE: { 76 const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle); 77 if (b != NULL) { 78 LOG_REFS("Parcel %p acquiring reference on remote %p", who, b.get()); 79 b->incStrong(who); 80 } 81 return; 82 } 83 case BINDER_TYPE_WEAK_HANDLE: { 84 const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle); 85 if (b != NULL) b.get_refs()->incWeak(who); 86 return; 87 } 88 case BINDER_TYPE_FD: { 89 // intentionally blank -- nothing to do to acquire this, but we do 90 // recognize it as a legitimate object type. 91 return; 92 } 93 } 94 95 LOGD("Invalid object type 0x%08lx", obj.type); 96} 97 98void release_object(const sp<ProcessState>& proc, 99 const flat_binder_object& obj, const void* who) 100{ 101 switch (obj.type) { 102 case BINDER_TYPE_BINDER: 103 if (obj.binder) { 104 LOG_REFS("Parcel %p releasing reference on local %p", who, obj.cookie); 105 static_cast<IBinder*>(obj.cookie)->decStrong(who); 106 } 107 return; 108 case BINDER_TYPE_WEAK_BINDER: 109 if (obj.binder) 110 static_cast<RefBase::weakref_type*>(obj.binder)->decWeak(who); 111 return; 112 case BINDER_TYPE_HANDLE: { 113 const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle); 114 if (b != NULL) { 115 LOG_REFS("Parcel %p releasing reference on remote %p", who, b.get()); 116 b->decStrong(who); 117 } 118 return; 119 } 120 case BINDER_TYPE_WEAK_HANDLE: { 121 const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle); 122 if (b != NULL) b.get_refs()->decWeak(who); 123 return; 124 } 125 case BINDER_TYPE_FD: { 126 if (obj.cookie != (void*)0) close(obj.handle); 127 return; 128 } 129 } 130 131 LOGE("Invalid object type 0x%08lx", obj.type); 132} 133 134inline static status_t finish_flatten_binder( 135 const sp<IBinder>& binder, const flat_binder_object& flat, Parcel* out) 136{ 137 return out->writeObject(flat, false); 138} 139 140status_t flatten_binder(const sp<ProcessState>& proc, 141 const sp<IBinder>& binder, Parcel* out) 142{ 143 flat_binder_object obj; 144 145 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 146 if (binder != NULL) { 147 IBinder *local = binder->localBinder(); 148 if (!local) { 149 BpBinder *proxy = binder->remoteBinder(); 150 if (proxy == NULL) { 151 LOGE("null proxy"); 152 } 153 const int32_t handle = proxy ? proxy->handle() : 0; 154 obj.type = BINDER_TYPE_HANDLE; 155 obj.handle = handle; 156 obj.cookie = NULL; 157 } else { 158 obj.type = BINDER_TYPE_BINDER; 159 obj.binder = local->getWeakRefs(); 160 obj.cookie = local; 161 } 162 } else { 163 obj.type = BINDER_TYPE_BINDER; 164 obj.binder = NULL; 165 obj.cookie = NULL; 166 } 167 168 return finish_flatten_binder(binder, obj, out); 169} 170 171status_t flatten_binder(const sp<ProcessState>& proc, 172 const wp<IBinder>& binder, Parcel* out) 173{ 174 flat_binder_object obj; 175 176 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 177 if (binder != NULL) { 178 sp<IBinder> real = binder.promote(); 179 if (real != NULL) { 180 IBinder *local = real->localBinder(); 181 if (!local) { 182 BpBinder *proxy = real->remoteBinder(); 183 if (proxy == NULL) { 184 LOGE("null proxy"); 185 } 186 const int32_t handle = proxy ? proxy->handle() : 0; 187 obj.type = BINDER_TYPE_WEAK_HANDLE; 188 obj.handle = handle; 189 obj.cookie = NULL; 190 } else { 191 obj.type = BINDER_TYPE_WEAK_BINDER; 192 obj.binder = binder.get_refs(); 193 obj.cookie = binder.unsafe_get(); 194 } 195 return finish_flatten_binder(real, obj, out); 196 } 197 198 // XXX How to deal? In order to flatten the given binder, 199 // we need to probe it for information, which requires a primary 200 // reference... but we don't have one. 201 // 202 // The OpenBinder implementation uses a dynamic_cast<> here, 203 // but we can't do that with the different reference counting 204 // implementation we are using. 205 LOGE("Unable to unflatten Binder weak reference!"); 206 obj.type = BINDER_TYPE_BINDER; 207 obj.binder = NULL; 208 obj.cookie = NULL; 209 return finish_flatten_binder(NULL, obj, out); 210 211 } else { 212 obj.type = BINDER_TYPE_BINDER; 213 obj.binder = NULL; 214 obj.cookie = NULL; 215 return finish_flatten_binder(NULL, obj, out); 216 } 217} 218 219inline static status_t finish_unflatten_binder( 220 BpBinder* proxy, const flat_binder_object& flat, const Parcel& in) 221{ 222 return NO_ERROR; 223} 224 225status_t unflatten_binder(const sp<ProcessState>& proc, 226 const Parcel& in, sp<IBinder>* out) 227{ 228 const flat_binder_object* flat = in.readObject(false); 229 230 if (flat) { 231 switch (flat->type) { 232 case BINDER_TYPE_BINDER: 233 *out = static_cast<IBinder*>(flat->cookie); 234 return finish_unflatten_binder(NULL, *flat, in); 235 case BINDER_TYPE_HANDLE: 236 *out = proc->getStrongProxyForHandle(flat->handle); 237 return finish_unflatten_binder( 238 static_cast<BpBinder*>(out->get()), *flat, in); 239 } 240 } 241 return BAD_TYPE; 242} 243 244status_t unflatten_binder(const sp<ProcessState>& proc, 245 const Parcel& in, wp<IBinder>* out) 246{ 247 const flat_binder_object* flat = in.readObject(false); 248 249 if (flat) { 250 switch (flat->type) { 251 case BINDER_TYPE_BINDER: 252 *out = static_cast<IBinder*>(flat->cookie); 253 return finish_unflatten_binder(NULL, *flat, in); 254 case BINDER_TYPE_WEAK_BINDER: 255 if (flat->binder != NULL) { 256 out->set_object_and_refs( 257 static_cast<IBinder*>(flat->cookie), 258 static_cast<RefBase::weakref_type*>(flat->binder)); 259 } else { 260 *out = NULL; 261 } 262 return finish_unflatten_binder(NULL, *flat, in); 263 case BINDER_TYPE_HANDLE: 264 case BINDER_TYPE_WEAK_HANDLE: 265 *out = proc->getWeakProxyForHandle(flat->handle); 266 return finish_unflatten_binder( 267 static_cast<BpBinder*>(out->unsafe_get()), *flat, in); 268 } 269 } 270 return BAD_TYPE; 271} 272 273// --------------------------------------------------------------------------- 274 275Parcel::Parcel() 276{ 277 initState(); 278} 279 280Parcel::~Parcel() 281{ 282 freeDataNoInit(); 283} 284 285const uint8_t* Parcel::data() const 286{ 287 return mData; 288} 289 290size_t Parcel::dataSize() const 291{ 292 return (mDataSize > mDataPos ? mDataSize : mDataPos); 293} 294 295size_t Parcel::dataAvail() const 296{ 297 // TODO: decide what to do about the possibility that this can 298 // report an available-data size that exceeds a Java int's max 299 // positive value, causing havoc. Fortunately this will only 300 // happen if someone constructs a Parcel containing more than two 301 // gigabytes of data, which on typical phone hardware is simply 302 // not possible. 303 return dataSize() - dataPosition(); 304} 305 306size_t Parcel::dataPosition() const 307{ 308 return mDataPos; 309} 310 311size_t Parcel::dataCapacity() const 312{ 313 return mDataCapacity; 314} 315 316status_t Parcel::setDataSize(size_t size) 317{ 318 status_t err; 319 err = continueWrite(size); 320 if (err == NO_ERROR) { 321 mDataSize = size; 322 LOGV("setDataSize Setting data size of %p to %d\n", this, mDataSize); 323 } 324 return err; 325} 326 327void Parcel::setDataPosition(size_t pos) const 328{ 329 mDataPos = pos; 330 mNextObjectHint = 0; 331} 332 333status_t Parcel::setDataCapacity(size_t size) 334{ 335 if (size > mDataSize) return continueWrite(size); 336 return NO_ERROR; 337} 338 339status_t Parcel::setData(const uint8_t* buffer, size_t len) 340{ 341 status_t err = restartWrite(len); 342 if (err == NO_ERROR) { 343 memcpy(const_cast<uint8_t*>(data()), buffer, len); 344 mDataSize = len; 345 mFdsKnown = false; 346 } 347 return err; 348} 349 350status_t Parcel::appendFrom(Parcel *parcel, size_t offset, size_t len) 351{ 352 const sp<ProcessState> proc(ProcessState::self()); 353 status_t err; 354 uint8_t *data = parcel->mData; 355 size_t *objects = parcel->mObjects; 356 size_t size = parcel->mObjectsSize; 357 int startPos = mDataPos; 358 int firstIndex = -1, lastIndex = -2; 359 360 if (len == 0) { 361 return NO_ERROR; 362 } 363 364 // range checks against the source parcel size 365 if ((offset > parcel->mDataSize) 366 || (len > parcel->mDataSize) 367 || (offset + len > parcel->mDataSize)) { 368 return BAD_VALUE; 369 } 370 371 // Count objects in range 372 for (int i = 0; i < (int) size; i++) { 373 size_t off = objects[i]; 374 if ((off >= offset) && (off < offset + len)) { 375 if (firstIndex == -1) { 376 firstIndex = i; 377 } 378 lastIndex = i; 379 } 380 } 381 int numObjects = lastIndex - firstIndex + 1; 382 383 // grow data 384 err = growData(len); 385 if (err != NO_ERROR) { 386 return err; 387 } 388 389 // append data 390 memcpy(mData + mDataPos, data + offset, len); 391 mDataPos += len; 392 mDataSize += len; 393 394 if (numObjects > 0) { 395 // grow objects 396 if (mObjectsCapacity < mObjectsSize + numObjects) { 397 int newSize = ((mObjectsSize + numObjects)*3)/2; 398 size_t *objects = 399 (size_t*)realloc(mObjects, newSize*sizeof(size_t)); 400 if (objects == (size_t*)0) { 401 return NO_MEMORY; 402 } 403 mObjects = objects; 404 mObjectsCapacity = newSize; 405 } 406 407 // append and acquire objects 408 int idx = mObjectsSize; 409 for (int i = firstIndex; i <= lastIndex; i++) { 410 size_t off = objects[i] - offset + startPos; 411 mObjects[idx++] = off; 412 mObjectsSize++; 413 414 flat_binder_object* flat 415 = reinterpret_cast<flat_binder_object*>(mData + off); 416 acquire_object(proc, *flat, this); 417 418 if (flat->type == BINDER_TYPE_FD) { 419 // If this is a file descriptor, we need to dup it so the 420 // new Parcel now owns its own fd, and can declare that we 421 // officially know we have fds. 422 flat->handle = dup(flat->handle); 423 flat->cookie = (void*)1; 424 mHasFds = mFdsKnown = true; 425 } 426 } 427 } 428 429 return NO_ERROR; 430} 431 432bool Parcel::hasFileDescriptors() const 433{ 434 if (!mFdsKnown) { 435 scanForFds(); 436 } 437 return mHasFds; 438} 439 440// Write RPC headers. (previously just the interface token) 441status_t Parcel::writeInterfaceToken(const String16& interface) 442{ 443 writeInt32(IPCThreadState::self()->getStrictModePolicy()); 444 // currently the interface identification token is just its name as a string 445 return writeString16(interface); 446} 447 448bool Parcel::checkInterface(IBinder* binder) const 449{ 450 return enforceInterface(binder->getInterfaceDescriptor()); 451} 452 453bool Parcel::enforceInterface(const String16& interface) const 454{ 455 int32_t strict_policy = readInt32(); 456 const String16 str(readString16()); 457 if (str == interface) { 458 return true; 459 } else { 460 LOGW("**** enforceInterface() expected '%s' but read '%s'\n", 461 String8(interface).string(), String8(str).string()); 462 return false; 463 } 464} 465 466const size_t* Parcel::objects() const 467{ 468 return mObjects; 469} 470 471size_t Parcel::objectsCount() const 472{ 473 return mObjectsSize; 474} 475 476status_t Parcel::errorCheck() const 477{ 478 return mError; 479} 480 481void Parcel::setError(status_t err) 482{ 483 mError = err; 484} 485 486status_t Parcel::finishWrite(size_t len) 487{ 488 //printf("Finish write of %d\n", len); 489 mDataPos += len; 490 LOGV("finishWrite Setting data pos of %p to %d\n", this, mDataPos); 491 if (mDataPos > mDataSize) { 492 mDataSize = mDataPos; 493 LOGV("finishWrite Setting data size of %p to %d\n", this, mDataSize); 494 } 495 //printf("New pos=%d, size=%d\n", mDataPos, mDataSize); 496 return NO_ERROR; 497} 498 499status_t Parcel::writeUnpadded(const void* data, size_t len) 500{ 501 size_t end = mDataPos + len; 502 if (end < mDataPos) { 503 // integer overflow 504 return BAD_VALUE; 505 } 506 507 if (end <= mDataCapacity) { 508restart_write: 509 memcpy(mData+mDataPos, data, len); 510 return finishWrite(len); 511 } 512 513 status_t err = growData(len); 514 if (err == NO_ERROR) goto restart_write; 515 return err; 516} 517 518status_t Parcel::write(const void* data, size_t len) 519{ 520 void* const d = writeInplace(len); 521 if (d) { 522 memcpy(d, data, len); 523 return NO_ERROR; 524 } 525 return mError; 526} 527 528void* Parcel::writeInplace(size_t len) 529{ 530 const size_t padded = PAD_SIZE(len); 531 532 // sanity check for integer overflow 533 if (mDataPos+padded < mDataPos) { 534 return NULL; 535 } 536 537 if ((mDataPos+padded) <= mDataCapacity) { 538restart_write: 539 //printf("Writing %ld bytes, padded to %ld\n", len, padded); 540 uint8_t* const data = mData+mDataPos; 541 542 // Need to pad at end? 543 if (padded != len) { 544#if BYTE_ORDER == BIG_ENDIAN 545 static const uint32_t mask[4] = { 546 0x00000000, 0xffffff00, 0xffff0000, 0xff000000 547 }; 548#endif 549#if BYTE_ORDER == LITTLE_ENDIAN 550 static const uint32_t mask[4] = { 551 0x00000000, 0x00ffffff, 0x0000ffff, 0x000000ff 552 }; 553#endif 554 //printf("Applying pad mask: %p to %p\n", (void*)mask[padded-len], 555 // *reinterpret_cast<void**>(data+padded-4)); 556 *reinterpret_cast<uint32_t*>(data+padded-4) &= mask[padded-len]; 557 } 558 559 finishWrite(padded); 560 return data; 561 } 562 563 status_t err = growData(padded); 564 if (err == NO_ERROR) goto restart_write; 565 return NULL; 566} 567 568status_t Parcel::writeInt32(int32_t val) 569{ 570 return writeAligned(val); 571} 572 573status_t Parcel::writeInt64(int64_t val) 574{ 575 return writeAligned(val); 576} 577 578status_t Parcel::writeFloat(float val) 579{ 580 return writeAligned(val); 581} 582 583status_t Parcel::writeDouble(double val) 584{ 585 return writeAligned(val); 586} 587 588status_t Parcel::writeIntPtr(intptr_t val) 589{ 590 return writeAligned(val); 591} 592 593status_t Parcel::writeCString(const char* str) 594{ 595 return write(str, strlen(str)+1); 596} 597 598status_t Parcel::writeString8(const String8& str) 599{ 600 status_t err = writeInt32(str.bytes()); 601 if (err == NO_ERROR) { 602 err = write(str.string(), str.bytes()+1); 603 } 604 return err; 605} 606 607status_t Parcel::writeString16(const String16& str) 608{ 609 return writeString16(str.string(), str.size()); 610} 611 612status_t Parcel::writeString16(const char16_t* str, size_t len) 613{ 614 if (str == NULL) return writeInt32(-1); 615 616 status_t err = writeInt32(len); 617 if (err == NO_ERROR) { 618 len *= sizeof(char16_t); 619 uint8_t* data = (uint8_t*)writeInplace(len+sizeof(char16_t)); 620 if (data) { 621 memcpy(data, str, len); 622 *reinterpret_cast<char16_t*>(data+len) = 0; 623 return NO_ERROR; 624 } 625 err = mError; 626 } 627 return err; 628} 629 630status_t Parcel::writeStrongBinder(const sp<IBinder>& val) 631{ 632 return flatten_binder(ProcessState::self(), val, this); 633} 634 635status_t Parcel::writeWeakBinder(const wp<IBinder>& val) 636{ 637 return flatten_binder(ProcessState::self(), val, this); 638} 639 640status_t Parcel::writeNativeHandle(const native_handle* handle) 641{ 642 if (!handle || handle->version != sizeof(native_handle)) 643 return BAD_TYPE; 644 645 status_t err; 646 err = writeInt32(handle->numFds); 647 if (err != NO_ERROR) return err; 648 649 err = writeInt32(handle->numInts); 650 if (err != NO_ERROR) return err; 651 652 for (int i=0 ; err==NO_ERROR && i<handle->numFds ; i++) 653 err = writeDupFileDescriptor(handle->data[i]); 654 655 if (err != NO_ERROR) { 656 LOGD("write native handle, write dup fd failed"); 657 return err; 658 } 659 err = write(handle->data + handle->numFds, sizeof(int)*handle->numInts); 660 return err; 661} 662 663status_t Parcel::writeFileDescriptor(int fd) 664{ 665 flat_binder_object obj; 666 obj.type = BINDER_TYPE_FD; 667 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 668 obj.handle = fd; 669 obj.cookie = (void*)0; 670 return writeObject(obj, true); 671} 672 673status_t Parcel::writeDupFileDescriptor(int fd) 674{ 675 flat_binder_object obj; 676 obj.type = BINDER_TYPE_FD; 677 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 678 obj.handle = dup(fd); 679 obj.cookie = (void*)1; 680 return writeObject(obj, true); 681} 682 683status_t Parcel::write(const Flattenable& val) 684{ 685 status_t err; 686 687 // size if needed 688 size_t len = val.getFlattenedSize(); 689 size_t fd_count = val.getFdCount(); 690 691 err = this->writeInt32(len); 692 if (err) return err; 693 694 err = this->writeInt32(fd_count); 695 if (err) return err; 696 697 // payload 698 void* buf = this->writeInplace(PAD_SIZE(len)); 699 if (buf == NULL) 700 return BAD_VALUE; 701 702 int* fds = NULL; 703 if (fd_count) { 704 fds = new int[fd_count]; 705 } 706 707 err = val.flatten(buf, len, fds, fd_count); 708 for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) { 709 err = this->writeDupFileDescriptor( fds[i] ); 710 } 711 712 if (fd_count) { 713 delete [] fds; 714 } 715 716 return err; 717} 718 719status_t Parcel::writeObject(const flat_binder_object& val, bool nullMetaData) 720{ 721 const bool enoughData = (mDataPos+sizeof(val)) <= mDataCapacity; 722 const bool enoughObjects = mObjectsSize < mObjectsCapacity; 723 if (enoughData && enoughObjects) { 724restart_write: 725 *reinterpret_cast<flat_binder_object*>(mData+mDataPos) = val; 726 727 // Need to write meta-data? 728 if (nullMetaData || val.binder != NULL) { 729 mObjects[mObjectsSize] = mDataPos; 730 acquire_object(ProcessState::self(), val, this); 731 mObjectsSize++; 732 } 733 734 // remember if it's a file descriptor 735 if (val.type == BINDER_TYPE_FD) { 736 mHasFds = mFdsKnown = true; 737 } 738 739 return finishWrite(sizeof(flat_binder_object)); 740 } 741 742 if (!enoughData) { 743 const status_t err = growData(sizeof(val)); 744 if (err != NO_ERROR) return err; 745 } 746 if (!enoughObjects) { 747 size_t newSize = ((mObjectsSize+2)*3)/2; 748 size_t* objects = (size_t*)realloc(mObjects, newSize*sizeof(size_t)); 749 if (objects == NULL) return NO_MEMORY; 750 mObjects = objects; 751 mObjectsCapacity = newSize; 752 } 753 754 goto restart_write; 755} 756 757void Parcel::remove(size_t start, size_t amt) 758{ 759 LOG_ALWAYS_FATAL("Parcel::remove() not yet implemented!"); 760} 761 762status_t Parcel::read(void* outData, size_t len) const 763{ 764 if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize) { 765 memcpy(outData, mData+mDataPos, len); 766 mDataPos += PAD_SIZE(len); 767 LOGV("read Setting data pos of %p to %d\n", this, mDataPos); 768 return NO_ERROR; 769 } 770 return NOT_ENOUGH_DATA; 771} 772 773const void* Parcel::readInplace(size_t len) const 774{ 775 if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize) { 776 const void* data = mData+mDataPos; 777 mDataPos += PAD_SIZE(len); 778 LOGV("readInplace Setting data pos of %p to %d\n", this, mDataPos); 779 return data; 780 } 781 return NULL; 782} 783 784template<class T> 785status_t Parcel::readAligned(T *pArg) const { 786 COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T)); 787 788 if ((mDataPos+sizeof(T)) <= mDataSize) { 789 const void* data = mData+mDataPos; 790 mDataPos += sizeof(T); 791 *pArg = *reinterpret_cast<const T*>(data); 792 return NO_ERROR; 793 } else { 794 return NOT_ENOUGH_DATA; 795 } 796} 797 798template<class T> 799T Parcel::readAligned() const { 800 T result; 801 if (readAligned(&result) != NO_ERROR) { 802 result = 0; 803 } 804 805 return result; 806} 807 808template<class T> 809status_t Parcel::writeAligned(T val) { 810 COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T)); 811 812 if ((mDataPos+sizeof(val)) <= mDataCapacity) { 813restart_write: 814 *reinterpret_cast<T*>(mData+mDataPos) = val; 815 return finishWrite(sizeof(val)); 816 } 817 818 status_t err = growData(sizeof(val)); 819 if (err == NO_ERROR) goto restart_write; 820 return err; 821} 822 823status_t Parcel::readInt32(int32_t *pArg) const 824{ 825 return readAligned(pArg); 826} 827 828int32_t Parcel::readInt32() const 829{ 830 return readAligned<int32_t>(); 831} 832 833 834status_t Parcel::readInt64(int64_t *pArg) const 835{ 836 return readAligned(pArg); 837} 838 839 840int64_t Parcel::readInt64() const 841{ 842 return readAligned<int64_t>(); 843} 844 845status_t Parcel::readFloat(float *pArg) const 846{ 847 return readAligned(pArg); 848} 849 850 851float Parcel::readFloat() const 852{ 853 return readAligned<float>(); 854} 855 856status_t Parcel::readDouble(double *pArg) const 857{ 858 return readAligned(pArg); 859} 860 861 862double Parcel::readDouble() const 863{ 864 return readAligned<double>(); 865} 866 867status_t Parcel::readIntPtr(intptr_t *pArg) const 868{ 869 return readAligned(pArg); 870} 871 872 873intptr_t Parcel::readIntPtr() const 874{ 875 return readAligned<intptr_t>(); 876} 877 878 879const char* Parcel::readCString() const 880{ 881 const size_t avail = mDataSize-mDataPos; 882 if (avail > 0) { 883 const char* str = reinterpret_cast<const char*>(mData+mDataPos); 884 // is the string's trailing NUL within the parcel's valid bounds? 885 const char* eos = reinterpret_cast<const char*>(memchr(str, 0, avail)); 886 if (eos) { 887 const size_t len = eos - str; 888 mDataPos += PAD_SIZE(len+1); 889 LOGV("readCString Setting data pos of %p to %d\n", this, mDataPos); 890 return str; 891 } 892 } 893 return NULL; 894} 895 896String8 Parcel::readString8() const 897{ 898 int32_t size = readInt32(); 899 // watch for potential int overflow adding 1 for trailing NUL 900 if (size > 0 && size < INT32_MAX) { 901 const char* str = (const char*)readInplace(size+1); 902 if (str) return String8(str, size); 903 } 904 return String8(); 905} 906 907String16 Parcel::readString16() const 908{ 909 size_t len; 910 const char16_t* str = readString16Inplace(&len); 911 if (str) return String16(str, len); 912 LOGE("Reading a NULL string not supported here."); 913 return String16(); 914} 915 916const char16_t* Parcel::readString16Inplace(size_t* outLen) const 917{ 918 int32_t size = readInt32(); 919 // watch for potential int overflow from size+1 920 if (size >= 0 && size < INT32_MAX) { 921 *outLen = size; 922 const char16_t* str = (const char16_t*)readInplace((size+1)*sizeof(char16_t)); 923 if (str != NULL) { 924 return str; 925 } 926 } 927 *outLen = 0; 928 return NULL; 929} 930 931sp<IBinder> Parcel::readStrongBinder() const 932{ 933 sp<IBinder> val; 934 unflatten_binder(ProcessState::self(), *this, &val); 935 return val; 936} 937 938wp<IBinder> Parcel::readWeakBinder() const 939{ 940 wp<IBinder> val; 941 unflatten_binder(ProcessState::self(), *this, &val); 942 return val; 943} 944 945 946native_handle* Parcel::readNativeHandle() const 947{ 948 int numFds, numInts; 949 status_t err; 950 err = readInt32(&numFds); 951 if (err != NO_ERROR) return 0; 952 err = readInt32(&numInts); 953 if (err != NO_ERROR) return 0; 954 955 native_handle* h = native_handle_create(numFds, numInts); 956 for (int i=0 ; err==NO_ERROR && i<numFds ; i++) { 957 h->data[i] = dup(readFileDescriptor()); 958 if (h->data[i] < 0) err = BAD_VALUE; 959 } 960 err = read(h->data + numFds, sizeof(int)*numInts); 961 if (err != NO_ERROR) { 962 native_handle_close(h); 963 native_handle_delete(h); 964 h = 0; 965 } 966 return h; 967} 968 969 970int Parcel::readFileDescriptor() const 971{ 972 const flat_binder_object* flat = readObject(true); 973 if (flat) { 974 switch (flat->type) { 975 case BINDER_TYPE_FD: 976 //LOGI("Returning file descriptor %ld from parcel %p\n", flat->handle, this); 977 return flat->handle; 978 } 979 } 980 return BAD_TYPE; 981} 982 983status_t Parcel::read(Flattenable& val) const 984{ 985 // size 986 const size_t len = this->readInt32(); 987 const size_t fd_count = this->readInt32(); 988 989 // payload 990 void const* buf = this->readInplace(PAD_SIZE(len)); 991 if (buf == NULL) 992 return BAD_VALUE; 993 994 int* fds = NULL; 995 if (fd_count) { 996 fds = new int[fd_count]; 997 } 998 999 status_t err = NO_ERROR; 1000 for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) { 1001 fds[i] = dup(this->readFileDescriptor()); 1002 if (fds[i] < 0) err = BAD_VALUE; 1003 } 1004 1005 if (err == NO_ERROR) { 1006 err = val.unflatten(buf, len, fds, fd_count); 1007 } 1008 1009 if (fd_count) { 1010 delete [] fds; 1011 } 1012 1013 return err; 1014} 1015const flat_binder_object* Parcel::readObject(bool nullMetaData) const 1016{ 1017 const size_t DPOS = mDataPos; 1018 if ((DPOS+sizeof(flat_binder_object)) <= mDataSize) { 1019 const flat_binder_object* obj 1020 = reinterpret_cast<const flat_binder_object*>(mData+DPOS); 1021 mDataPos = DPOS + sizeof(flat_binder_object); 1022 if (!nullMetaData && (obj->cookie == NULL && obj->binder == NULL)) { 1023 // When transferring a NULL object, we don't write it into 1024 // the object list, so we don't want to check for it when 1025 // reading. 1026 LOGV("readObject Setting data pos of %p to %d\n", this, mDataPos); 1027 return obj; 1028 } 1029 1030 // Ensure that this object is valid... 1031 size_t* const OBJS = mObjects; 1032 const size_t N = mObjectsSize; 1033 size_t opos = mNextObjectHint; 1034 1035 if (N > 0) { 1036 LOGV("Parcel %p looking for obj at %d, hint=%d\n", 1037 this, DPOS, opos); 1038 1039 // Start at the current hint position, looking for an object at 1040 // the current data position. 1041 if (opos < N) { 1042 while (opos < (N-1) && OBJS[opos] < DPOS) { 1043 opos++; 1044 } 1045 } else { 1046 opos = N-1; 1047 } 1048 if (OBJS[opos] == DPOS) { 1049 // Found it! 1050 LOGV("Parcel found obj %d at index %d with forward search", 1051 this, DPOS, opos); 1052 mNextObjectHint = opos+1; 1053 LOGV("readObject Setting data pos of %p to %d\n", this, mDataPos); 1054 return obj; 1055 } 1056 1057 // Look backwards for it... 1058 while (opos > 0 && OBJS[opos] > DPOS) { 1059 opos--; 1060 } 1061 if (OBJS[opos] == DPOS) { 1062 // Found it! 1063 LOGV("Parcel found obj %d at index %d with backward search", 1064 this, DPOS, opos); 1065 mNextObjectHint = opos+1; 1066 LOGV("readObject Setting data pos of %p to %d\n", this, mDataPos); 1067 return obj; 1068 } 1069 } 1070 LOGW("Attempt to read object from Parcel %p at offset %d that is not in the object list", 1071 this, DPOS); 1072 } 1073 return NULL; 1074} 1075 1076void Parcel::closeFileDescriptors() 1077{ 1078 size_t i = mObjectsSize; 1079 if (i > 0) { 1080 //LOGI("Closing file descriptors for %d objects...", mObjectsSize); 1081 } 1082 while (i > 0) { 1083 i--; 1084 const flat_binder_object* flat 1085 = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]); 1086 if (flat->type == BINDER_TYPE_FD) { 1087 //LOGI("Closing fd: %ld\n", flat->handle); 1088 close(flat->handle); 1089 } 1090 } 1091} 1092 1093const uint8_t* Parcel::ipcData() const 1094{ 1095 return mData; 1096} 1097 1098size_t Parcel::ipcDataSize() const 1099{ 1100 return (mDataSize > mDataPos ? mDataSize : mDataPos); 1101} 1102 1103const size_t* Parcel::ipcObjects() const 1104{ 1105 return mObjects; 1106} 1107 1108size_t Parcel::ipcObjectsCount() const 1109{ 1110 return mObjectsSize; 1111} 1112 1113void Parcel::ipcSetDataReference(const uint8_t* data, size_t dataSize, 1114 const size_t* objects, size_t objectsCount, release_func relFunc, void* relCookie) 1115{ 1116 freeDataNoInit(); 1117 mError = NO_ERROR; 1118 mData = const_cast<uint8_t*>(data); 1119 mDataSize = mDataCapacity = dataSize; 1120 //LOGI("setDataReference Setting data size of %p to %lu (pid=%d)\n", this, mDataSize, getpid()); 1121 mDataPos = 0; 1122 LOGV("setDataReference Setting data pos of %p to %d\n", this, mDataPos); 1123 mObjects = const_cast<size_t*>(objects); 1124 mObjectsSize = mObjectsCapacity = objectsCount; 1125 mNextObjectHint = 0; 1126 mOwner = relFunc; 1127 mOwnerCookie = relCookie; 1128 scanForFds(); 1129} 1130 1131void Parcel::print(TextOutput& to, uint32_t flags) const 1132{ 1133 to << "Parcel("; 1134 1135 if (errorCheck() != NO_ERROR) { 1136 const status_t err = errorCheck(); 1137 to << "Error: " << (void*)err << " \"" << strerror(-err) << "\""; 1138 } else if (dataSize() > 0) { 1139 const uint8_t* DATA = data(); 1140 to << indent << HexDump(DATA, dataSize()) << dedent; 1141 const size_t* OBJS = objects(); 1142 const size_t N = objectsCount(); 1143 for (size_t i=0; i<N; i++) { 1144 const flat_binder_object* flat 1145 = reinterpret_cast<const flat_binder_object*>(DATA+OBJS[i]); 1146 to << endl << "Object #" << i << " @ " << (void*)OBJS[i] << ": " 1147 << TypeCode(flat->type & 0x7f7f7f00) 1148 << " = " << flat->binder; 1149 } 1150 } else { 1151 to << "NULL"; 1152 } 1153 1154 to << ")"; 1155} 1156 1157void Parcel::releaseObjects() 1158{ 1159 const sp<ProcessState> proc(ProcessState::self()); 1160 size_t i = mObjectsSize; 1161 uint8_t* const data = mData; 1162 size_t* const objects = mObjects; 1163 while (i > 0) { 1164 i--; 1165 const flat_binder_object* flat 1166 = reinterpret_cast<flat_binder_object*>(data+objects[i]); 1167 release_object(proc, *flat, this); 1168 } 1169} 1170 1171void Parcel::acquireObjects() 1172{ 1173 const sp<ProcessState> proc(ProcessState::self()); 1174 size_t i = mObjectsSize; 1175 uint8_t* const data = mData; 1176 size_t* const objects = mObjects; 1177 while (i > 0) { 1178 i--; 1179 const flat_binder_object* flat 1180 = reinterpret_cast<flat_binder_object*>(data+objects[i]); 1181 acquire_object(proc, *flat, this); 1182 } 1183} 1184 1185void Parcel::freeData() 1186{ 1187 freeDataNoInit(); 1188 initState(); 1189} 1190 1191void Parcel::freeDataNoInit() 1192{ 1193 if (mOwner) { 1194 //LOGI("Freeing data ref of %p (pid=%d)\n", this, getpid()); 1195 mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie); 1196 } else { 1197 releaseObjects(); 1198 if (mData) free(mData); 1199 if (mObjects) free(mObjects); 1200 } 1201} 1202 1203status_t Parcel::growData(size_t len) 1204{ 1205 size_t newSize = ((mDataSize+len)*3)/2; 1206 return (newSize <= mDataSize) 1207 ? (status_t) NO_MEMORY 1208 : continueWrite(newSize); 1209} 1210 1211status_t Parcel::restartWrite(size_t desired) 1212{ 1213 if (mOwner) { 1214 freeData(); 1215 return continueWrite(desired); 1216 } 1217 1218 uint8_t* data = (uint8_t*)realloc(mData, desired); 1219 if (!data && desired > mDataCapacity) { 1220 mError = NO_MEMORY; 1221 return NO_MEMORY; 1222 } 1223 1224 releaseObjects(); 1225 1226 if (data) { 1227 mData = data; 1228 mDataCapacity = desired; 1229 } 1230 1231 mDataSize = mDataPos = 0; 1232 LOGV("restartWrite Setting data size of %p to %d\n", this, mDataSize); 1233 LOGV("restartWrite Setting data pos of %p to %d\n", this, mDataPos); 1234 1235 free(mObjects); 1236 mObjects = NULL; 1237 mObjectsSize = mObjectsCapacity = 0; 1238 mNextObjectHint = 0; 1239 mHasFds = false; 1240 mFdsKnown = true; 1241 1242 return NO_ERROR; 1243} 1244 1245status_t Parcel::continueWrite(size_t desired) 1246{ 1247 // If shrinking, first adjust for any objects that appear 1248 // after the new data size. 1249 size_t objectsSize = mObjectsSize; 1250 if (desired < mDataSize) { 1251 if (desired == 0) { 1252 objectsSize = 0; 1253 } else { 1254 while (objectsSize > 0) { 1255 if (mObjects[objectsSize-1] < desired) 1256 break; 1257 objectsSize--; 1258 } 1259 } 1260 } 1261 1262 if (mOwner) { 1263 // If the size is going to zero, just release the owner's data. 1264 if (desired == 0) { 1265 freeData(); 1266 return NO_ERROR; 1267 } 1268 1269 // If there is a different owner, we need to take 1270 // posession. 1271 uint8_t* data = (uint8_t*)malloc(desired); 1272 if (!data) { 1273 mError = NO_MEMORY; 1274 return NO_MEMORY; 1275 } 1276 size_t* objects = NULL; 1277 1278 if (objectsSize) { 1279 objects = (size_t*)malloc(objectsSize*sizeof(size_t)); 1280 if (!objects) { 1281 mError = NO_MEMORY; 1282 return NO_MEMORY; 1283 } 1284 1285 // Little hack to only acquire references on objects 1286 // we will be keeping. 1287 size_t oldObjectsSize = mObjectsSize; 1288 mObjectsSize = objectsSize; 1289 acquireObjects(); 1290 mObjectsSize = oldObjectsSize; 1291 } 1292 1293 if (mData) { 1294 memcpy(data, mData, mDataSize < desired ? mDataSize : desired); 1295 } 1296 if (objects && mObjects) { 1297 memcpy(objects, mObjects, objectsSize*sizeof(size_t)); 1298 } 1299 //LOGI("Freeing data ref of %p (pid=%d)\n", this, getpid()); 1300 mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie); 1301 mOwner = NULL; 1302 1303 mData = data; 1304 mObjects = objects; 1305 mDataSize = (mDataSize < desired) ? mDataSize : desired; 1306 LOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize); 1307 mDataCapacity = desired; 1308 mObjectsSize = mObjectsCapacity = objectsSize; 1309 mNextObjectHint = 0; 1310 1311 } else if (mData) { 1312 if (objectsSize < mObjectsSize) { 1313 // Need to release refs on any objects we are dropping. 1314 const sp<ProcessState> proc(ProcessState::self()); 1315 for (size_t i=objectsSize; i<mObjectsSize; i++) { 1316 const flat_binder_object* flat 1317 = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]); 1318 if (flat->type == BINDER_TYPE_FD) { 1319 // will need to rescan because we may have lopped off the only FDs 1320 mFdsKnown = false; 1321 } 1322 release_object(proc, *flat, this); 1323 } 1324 size_t* objects = 1325 (size_t*)realloc(mObjects, objectsSize*sizeof(size_t)); 1326 if (objects) { 1327 mObjects = objects; 1328 } 1329 mObjectsSize = objectsSize; 1330 mNextObjectHint = 0; 1331 } 1332 1333 // We own the data, so we can just do a realloc(). 1334 if (desired > mDataCapacity) { 1335 uint8_t* data = (uint8_t*)realloc(mData, desired); 1336 if (data) { 1337 mData = data; 1338 mDataCapacity = desired; 1339 } else if (desired > mDataCapacity) { 1340 mError = NO_MEMORY; 1341 return NO_MEMORY; 1342 } 1343 } else { 1344 mDataSize = desired; 1345 LOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize); 1346 if (mDataPos > desired) { 1347 mDataPos = desired; 1348 LOGV("continueWrite Setting data pos of %p to %d\n", this, mDataPos); 1349 } 1350 } 1351 1352 } else { 1353 // This is the first data. Easy! 1354 uint8_t* data = (uint8_t*)malloc(desired); 1355 if (!data) { 1356 mError = NO_MEMORY; 1357 return NO_MEMORY; 1358 } 1359 1360 if(!(mDataCapacity == 0 && mObjects == NULL 1361 && mObjectsCapacity == 0)) { 1362 LOGE("continueWrite: %d/%p/%d/%d", mDataCapacity, mObjects, mObjectsCapacity, desired); 1363 } 1364 1365 mData = data; 1366 mDataSize = mDataPos = 0; 1367 LOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize); 1368 LOGV("continueWrite Setting data pos of %p to %d\n", this, mDataPos); 1369 mDataCapacity = desired; 1370 } 1371 1372 return NO_ERROR; 1373} 1374 1375void Parcel::initState() 1376{ 1377 mError = NO_ERROR; 1378 mData = 0; 1379 mDataSize = 0; 1380 mDataCapacity = 0; 1381 mDataPos = 0; 1382 LOGV("initState Setting data size of %p to %d\n", this, mDataSize); 1383 LOGV("initState Setting data pos of %p to %d\n", this, mDataPos); 1384 mObjects = NULL; 1385 mObjectsSize = 0; 1386 mObjectsCapacity = 0; 1387 mNextObjectHint = 0; 1388 mHasFds = false; 1389 mFdsKnown = true; 1390 mOwner = NULL; 1391} 1392 1393void Parcel::scanForFds() const 1394{ 1395 bool hasFds = false; 1396 for (size_t i=0; i<mObjectsSize; i++) { 1397 const flat_binder_object* flat 1398 = reinterpret_cast<const flat_binder_object*>(mData + mObjects[i]); 1399 if (flat->type == BINDER_TYPE_FD) { 1400 hasFds = true; 1401 break; 1402 } 1403 } 1404 mHasFds = hasFds; 1405 mFdsKnown = true; 1406} 1407 1408}; // namespace android 1409