Parcel.cpp revision 97e2bcd76021b31c5064fd3f669bc3f450b4c952
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// Note: must be kept in sync with android/os/StrictMode.java's PENALTY_GATHER 52#define STRICT_MODE_PENALTY_GATHER 0x100 53 54// Note: must be kept in sync with android/os/Parcel.java's EX_HAS_REPLY_HEADER 55#define EX_HAS_REPLY_HEADER -128 56 57// XXX This can be made public if we want to provide 58// support for typed data. 59struct small_flat_data 60{ 61 uint32_t type; 62 uint32_t data; 63}; 64 65namespace android { 66 67void acquire_object(const sp<ProcessState>& proc, 68 const flat_binder_object& obj, const void* who) 69{ 70 switch (obj.type) { 71 case BINDER_TYPE_BINDER: 72 if (obj.binder) { 73 LOG_REFS("Parcel %p acquiring reference on local %p", who, obj.cookie); 74 static_cast<IBinder*>(obj.cookie)->incStrong(who); 75 } 76 return; 77 case BINDER_TYPE_WEAK_BINDER: 78 if (obj.binder) 79 static_cast<RefBase::weakref_type*>(obj.binder)->incWeak(who); 80 return; 81 case BINDER_TYPE_HANDLE: { 82 const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle); 83 if (b != NULL) { 84 LOG_REFS("Parcel %p acquiring reference on remote %p", who, b.get()); 85 b->incStrong(who); 86 } 87 return; 88 } 89 case BINDER_TYPE_WEAK_HANDLE: { 90 const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle); 91 if (b != NULL) b.get_refs()->incWeak(who); 92 return; 93 } 94 case BINDER_TYPE_FD: { 95 // intentionally blank -- nothing to do to acquire this, but we do 96 // recognize it as a legitimate object type. 97 return; 98 } 99 } 100 101 LOGD("Invalid object type 0x%08lx", obj.type); 102} 103 104void release_object(const sp<ProcessState>& proc, 105 const flat_binder_object& obj, const void* who) 106{ 107 switch (obj.type) { 108 case BINDER_TYPE_BINDER: 109 if (obj.binder) { 110 LOG_REFS("Parcel %p releasing reference on local %p", who, obj.cookie); 111 static_cast<IBinder*>(obj.cookie)->decStrong(who); 112 } 113 return; 114 case BINDER_TYPE_WEAK_BINDER: 115 if (obj.binder) 116 static_cast<RefBase::weakref_type*>(obj.binder)->decWeak(who); 117 return; 118 case BINDER_TYPE_HANDLE: { 119 const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle); 120 if (b != NULL) { 121 LOG_REFS("Parcel %p releasing reference on remote %p", who, b.get()); 122 b->decStrong(who); 123 } 124 return; 125 } 126 case BINDER_TYPE_WEAK_HANDLE: { 127 const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle); 128 if (b != NULL) b.get_refs()->decWeak(who); 129 return; 130 } 131 case BINDER_TYPE_FD: { 132 if (obj.cookie != (void*)0) close(obj.handle); 133 return; 134 } 135 } 136 137 LOGE("Invalid object type 0x%08lx", obj.type); 138} 139 140inline static status_t finish_flatten_binder( 141 const sp<IBinder>& binder, const flat_binder_object& flat, Parcel* out) 142{ 143 return out->writeObject(flat, false); 144} 145 146status_t flatten_binder(const sp<ProcessState>& proc, 147 const sp<IBinder>& binder, Parcel* out) 148{ 149 flat_binder_object obj; 150 151 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 152 if (binder != NULL) { 153 IBinder *local = binder->localBinder(); 154 if (!local) { 155 BpBinder *proxy = binder->remoteBinder(); 156 if (proxy == NULL) { 157 LOGE("null proxy"); 158 } 159 const int32_t handle = proxy ? proxy->handle() : 0; 160 obj.type = BINDER_TYPE_HANDLE; 161 obj.handle = handle; 162 obj.cookie = NULL; 163 } else { 164 obj.type = BINDER_TYPE_BINDER; 165 obj.binder = local->getWeakRefs(); 166 obj.cookie = local; 167 } 168 } else { 169 obj.type = BINDER_TYPE_BINDER; 170 obj.binder = NULL; 171 obj.cookie = NULL; 172 } 173 174 return finish_flatten_binder(binder, obj, out); 175} 176 177status_t flatten_binder(const sp<ProcessState>& proc, 178 const wp<IBinder>& binder, Parcel* out) 179{ 180 flat_binder_object obj; 181 182 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 183 if (binder != NULL) { 184 sp<IBinder> real = binder.promote(); 185 if (real != NULL) { 186 IBinder *local = real->localBinder(); 187 if (!local) { 188 BpBinder *proxy = real->remoteBinder(); 189 if (proxy == NULL) { 190 LOGE("null proxy"); 191 } 192 const int32_t handle = proxy ? proxy->handle() : 0; 193 obj.type = BINDER_TYPE_WEAK_HANDLE; 194 obj.handle = handle; 195 obj.cookie = NULL; 196 } else { 197 obj.type = BINDER_TYPE_WEAK_BINDER; 198 obj.binder = binder.get_refs(); 199 obj.cookie = binder.unsafe_get(); 200 } 201 return finish_flatten_binder(real, obj, out); 202 } 203 204 // XXX How to deal? In order to flatten the given binder, 205 // we need to probe it for information, which requires a primary 206 // reference... but we don't have one. 207 // 208 // The OpenBinder implementation uses a dynamic_cast<> here, 209 // but we can't do that with the different reference counting 210 // implementation we are using. 211 LOGE("Unable to unflatten Binder weak reference!"); 212 obj.type = BINDER_TYPE_BINDER; 213 obj.binder = NULL; 214 obj.cookie = NULL; 215 return finish_flatten_binder(NULL, obj, out); 216 217 } else { 218 obj.type = BINDER_TYPE_BINDER; 219 obj.binder = NULL; 220 obj.cookie = NULL; 221 return finish_flatten_binder(NULL, obj, out); 222 } 223} 224 225inline static status_t finish_unflatten_binder( 226 BpBinder* proxy, const flat_binder_object& flat, const Parcel& in) 227{ 228 return NO_ERROR; 229} 230 231status_t unflatten_binder(const sp<ProcessState>& proc, 232 const Parcel& in, sp<IBinder>* out) 233{ 234 const flat_binder_object* flat = in.readObject(false); 235 236 if (flat) { 237 switch (flat->type) { 238 case BINDER_TYPE_BINDER: 239 *out = static_cast<IBinder*>(flat->cookie); 240 return finish_unflatten_binder(NULL, *flat, in); 241 case BINDER_TYPE_HANDLE: 242 *out = proc->getStrongProxyForHandle(flat->handle); 243 return finish_unflatten_binder( 244 static_cast<BpBinder*>(out->get()), *flat, in); 245 } 246 } 247 return BAD_TYPE; 248} 249 250status_t unflatten_binder(const sp<ProcessState>& proc, 251 const Parcel& in, wp<IBinder>* out) 252{ 253 const flat_binder_object* flat = in.readObject(false); 254 255 if (flat) { 256 switch (flat->type) { 257 case BINDER_TYPE_BINDER: 258 *out = static_cast<IBinder*>(flat->cookie); 259 return finish_unflatten_binder(NULL, *flat, in); 260 case BINDER_TYPE_WEAK_BINDER: 261 if (flat->binder != NULL) { 262 out->set_object_and_refs( 263 static_cast<IBinder*>(flat->cookie), 264 static_cast<RefBase::weakref_type*>(flat->binder)); 265 } else { 266 *out = NULL; 267 } 268 return finish_unflatten_binder(NULL, *flat, in); 269 case BINDER_TYPE_HANDLE: 270 case BINDER_TYPE_WEAK_HANDLE: 271 *out = proc->getWeakProxyForHandle(flat->handle); 272 return finish_unflatten_binder( 273 static_cast<BpBinder*>(out->unsafe_get()), *flat, in); 274 } 275 } 276 return BAD_TYPE; 277} 278 279// --------------------------------------------------------------------------- 280 281Parcel::Parcel() 282{ 283 initState(); 284} 285 286Parcel::~Parcel() 287{ 288 freeDataNoInit(); 289} 290 291const uint8_t* Parcel::data() const 292{ 293 return mData; 294} 295 296size_t Parcel::dataSize() const 297{ 298 return (mDataSize > mDataPos ? mDataSize : mDataPos); 299} 300 301size_t Parcel::dataAvail() const 302{ 303 // TODO: decide what to do about the possibility that this can 304 // report an available-data size that exceeds a Java int's max 305 // positive value, causing havoc. Fortunately this will only 306 // happen if someone constructs a Parcel containing more than two 307 // gigabytes of data, which on typical phone hardware is simply 308 // not possible. 309 return dataSize() - dataPosition(); 310} 311 312size_t Parcel::dataPosition() const 313{ 314 return mDataPos; 315} 316 317size_t Parcel::dataCapacity() const 318{ 319 return mDataCapacity; 320} 321 322status_t Parcel::setDataSize(size_t size) 323{ 324 status_t err; 325 err = continueWrite(size); 326 if (err == NO_ERROR) { 327 mDataSize = size; 328 LOGV("setDataSize Setting data size of %p to %d\n", this, mDataSize); 329 } 330 return err; 331} 332 333void Parcel::setDataPosition(size_t pos) const 334{ 335 mDataPos = pos; 336 mNextObjectHint = 0; 337} 338 339status_t Parcel::setDataCapacity(size_t size) 340{ 341 if (size > mDataCapacity) return continueWrite(size); 342 return NO_ERROR; 343} 344 345status_t Parcel::setData(const uint8_t* buffer, size_t len) 346{ 347 status_t err = restartWrite(len); 348 if (err == NO_ERROR) { 349 memcpy(const_cast<uint8_t*>(data()), buffer, len); 350 mDataSize = len; 351 mFdsKnown = false; 352 } 353 return err; 354} 355 356status_t Parcel::appendFrom(Parcel *parcel, size_t offset, size_t len) 357{ 358 const sp<ProcessState> proc(ProcessState::self()); 359 status_t err; 360 uint8_t *data = parcel->mData; 361 size_t *objects = parcel->mObjects; 362 size_t size = parcel->mObjectsSize; 363 int startPos = mDataPos; 364 int firstIndex = -1, lastIndex = -2; 365 366 if (len == 0) { 367 return NO_ERROR; 368 } 369 370 // range checks against the source parcel size 371 if ((offset > parcel->mDataSize) 372 || (len > parcel->mDataSize) 373 || (offset + len > parcel->mDataSize)) { 374 return BAD_VALUE; 375 } 376 377 // Count objects in range 378 for (int i = 0; i < (int) size; i++) { 379 size_t off = objects[i]; 380 if ((off >= offset) && (off < offset + len)) { 381 if (firstIndex == -1) { 382 firstIndex = i; 383 } 384 lastIndex = i; 385 } 386 } 387 int numObjects = lastIndex - firstIndex + 1; 388 389 if ((mDataSize+len) > mDataCapacity) { 390 // grow data 391 err = growData(len); 392 if (err != NO_ERROR) { 393 return err; 394 } 395 } 396 397 // append data 398 memcpy(mData + mDataPos, data + offset, len); 399 mDataPos += len; 400 mDataSize += len; 401 402 if (numObjects > 0) { 403 // grow objects 404 if (mObjectsCapacity < mObjectsSize + numObjects) { 405 int newSize = ((mObjectsSize + numObjects)*3)/2; 406 size_t *objects = 407 (size_t*)realloc(mObjects, newSize*sizeof(size_t)); 408 if (objects == (size_t*)0) { 409 return NO_MEMORY; 410 } 411 mObjects = objects; 412 mObjectsCapacity = newSize; 413 } 414 415 // append and acquire objects 416 int idx = mObjectsSize; 417 for (int i = firstIndex; i <= lastIndex; i++) { 418 size_t off = objects[i] - offset + startPos; 419 mObjects[idx++] = off; 420 mObjectsSize++; 421 422 flat_binder_object* flat 423 = reinterpret_cast<flat_binder_object*>(mData + off); 424 acquire_object(proc, *flat, this); 425 426 if (flat->type == BINDER_TYPE_FD) { 427 // If this is a file descriptor, we need to dup it so the 428 // new Parcel now owns its own fd, and can declare that we 429 // officially know we have fds. 430 flat->handle = dup(flat->handle); 431 flat->cookie = (void*)1; 432 mHasFds = mFdsKnown = true; 433 } 434 } 435 } 436 437 return NO_ERROR; 438} 439 440bool Parcel::hasFileDescriptors() const 441{ 442 if (!mFdsKnown) { 443 scanForFds(); 444 } 445 return mHasFds; 446} 447 448// Write RPC headers. (previously just the interface token) 449status_t Parcel::writeInterfaceToken(const String16& interface) 450{ 451 writeInt32(IPCThreadState::self()->getStrictModePolicy() | 452 STRICT_MODE_PENALTY_GATHER); 453 // currently the interface identification token is just its name as a string 454 return writeString16(interface); 455} 456 457bool Parcel::checkInterface(IBinder* binder) const 458{ 459 return enforceInterface(binder->getInterfaceDescriptor()); 460} 461 462bool Parcel::enforceInterface(const String16& interface, 463 IPCThreadState* threadState) const 464{ 465 int32_t strictPolicy = readInt32(); 466 if (threadState == NULL) { 467 threadState = IPCThreadState::self(); 468 } 469 if ((threadState->getLastTransactionBinderFlags() & 470 IBinder::FLAG_ONEWAY) != 0) { 471 // For one-way calls, the callee is running entirely 472 // disconnected from the caller, so disable StrictMode entirely. 473 // Not only does disk/network usage not impact the caller, but 474 // there's no way to commuicate back any violations anyway. 475 threadState->setStrictModePolicy(0); 476 } else { 477 threadState->setStrictModePolicy(strictPolicy); 478 } 479 const String16 str(readString16()); 480 if (str == interface) { 481 return true; 482 } else { 483 LOGW("**** enforceInterface() expected '%s' but read '%s'\n", 484 String8(interface).string(), String8(str).string()); 485 return false; 486 } 487} 488 489const size_t* Parcel::objects() const 490{ 491 return mObjects; 492} 493 494size_t Parcel::objectsCount() const 495{ 496 return mObjectsSize; 497} 498 499status_t Parcel::errorCheck() const 500{ 501 return mError; 502} 503 504void Parcel::setError(status_t err) 505{ 506 mError = err; 507} 508 509status_t Parcel::finishWrite(size_t len) 510{ 511 //printf("Finish write of %d\n", len); 512 mDataPos += len; 513 LOGV("finishWrite Setting data pos of %p to %d\n", this, mDataPos); 514 if (mDataPos > mDataSize) { 515 mDataSize = mDataPos; 516 LOGV("finishWrite Setting data size of %p to %d\n", this, mDataSize); 517 } 518 //printf("New pos=%d, size=%d\n", mDataPos, mDataSize); 519 return NO_ERROR; 520} 521 522status_t Parcel::writeUnpadded(const void* data, size_t len) 523{ 524 size_t end = mDataPos + len; 525 if (end < mDataPos) { 526 // integer overflow 527 return BAD_VALUE; 528 } 529 530 if (end <= mDataCapacity) { 531restart_write: 532 memcpy(mData+mDataPos, data, len); 533 return finishWrite(len); 534 } 535 536 status_t err = growData(len); 537 if (err == NO_ERROR) goto restart_write; 538 return err; 539} 540 541status_t Parcel::write(const void* data, size_t len) 542{ 543 void* const d = writeInplace(len); 544 if (d) { 545 memcpy(d, data, len); 546 return NO_ERROR; 547 } 548 return mError; 549} 550 551void* Parcel::writeInplace(size_t len) 552{ 553 const size_t padded = PAD_SIZE(len); 554 555 // sanity check for integer overflow 556 if (mDataPos+padded < mDataPos) { 557 return NULL; 558 } 559 560 if ((mDataPos+padded) <= mDataCapacity) { 561restart_write: 562 //printf("Writing %ld bytes, padded to %ld\n", len, padded); 563 uint8_t* const data = mData+mDataPos; 564 565 // Need to pad at end? 566 if (padded != len) { 567#if BYTE_ORDER == BIG_ENDIAN 568 static const uint32_t mask[4] = { 569 0x00000000, 0xffffff00, 0xffff0000, 0xff000000 570 }; 571#endif 572#if BYTE_ORDER == LITTLE_ENDIAN 573 static const uint32_t mask[4] = { 574 0x00000000, 0x00ffffff, 0x0000ffff, 0x000000ff 575 }; 576#endif 577 //printf("Applying pad mask: %p to %p\n", (void*)mask[padded-len], 578 // *reinterpret_cast<void**>(data+padded-4)); 579 *reinterpret_cast<uint32_t*>(data+padded-4) &= mask[padded-len]; 580 } 581 582 finishWrite(padded); 583 return data; 584 } 585 586 status_t err = growData(padded); 587 if (err == NO_ERROR) goto restart_write; 588 return NULL; 589} 590 591status_t Parcel::writeInt32(int32_t val) 592{ 593 return writeAligned(val); 594} 595 596status_t Parcel::writeInt64(int64_t val) 597{ 598 return writeAligned(val); 599} 600 601status_t Parcel::writeFloat(float val) 602{ 603 return writeAligned(val); 604} 605 606status_t Parcel::writeDouble(double val) 607{ 608 return writeAligned(val); 609} 610 611status_t Parcel::writeIntPtr(intptr_t val) 612{ 613 return writeAligned(val); 614} 615 616status_t Parcel::writeCString(const char* str) 617{ 618 return write(str, strlen(str)+1); 619} 620 621status_t Parcel::writeString8(const String8& str) 622{ 623 status_t err = writeInt32(str.bytes()); 624 // only write string if its length is more than zero characters, 625 // as readString8 will only read if the length field is non-zero. 626 // this is slightly different from how writeString16 works. 627 if (str.bytes() > 0 && err == NO_ERROR) { 628 err = write(str.string(), str.bytes()+1); 629 } 630 return err; 631} 632 633status_t Parcel::writeString16(const String16& str) 634{ 635 return writeString16(str.string(), str.size()); 636} 637 638status_t Parcel::writeString16(const char16_t* str, size_t len) 639{ 640 if (str == NULL) return writeInt32(-1); 641 642 status_t err = writeInt32(len); 643 if (err == NO_ERROR) { 644 len *= sizeof(char16_t); 645 uint8_t* data = (uint8_t*)writeInplace(len+sizeof(char16_t)); 646 if (data) { 647 memcpy(data, str, len); 648 *reinterpret_cast<char16_t*>(data+len) = 0; 649 return NO_ERROR; 650 } 651 err = mError; 652 } 653 return err; 654} 655 656status_t Parcel::writeStrongBinder(const sp<IBinder>& val) 657{ 658 return flatten_binder(ProcessState::self(), val, this); 659} 660 661status_t Parcel::writeWeakBinder(const wp<IBinder>& val) 662{ 663 return flatten_binder(ProcessState::self(), val, this); 664} 665 666status_t Parcel::writeNativeHandle(const native_handle* handle) 667{ 668 if (!handle || handle->version != sizeof(native_handle)) 669 return BAD_TYPE; 670 671 status_t err; 672 err = writeInt32(handle->numFds); 673 if (err != NO_ERROR) return err; 674 675 err = writeInt32(handle->numInts); 676 if (err != NO_ERROR) return err; 677 678 for (int i=0 ; err==NO_ERROR && i<handle->numFds ; i++) 679 err = writeDupFileDescriptor(handle->data[i]); 680 681 if (err != NO_ERROR) { 682 LOGD("write native handle, write dup fd failed"); 683 return err; 684 } 685 err = write(handle->data + handle->numFds, sizeof(int)*handle->numInts); 686 return err; 687} 688 689status_t Parcel::writeFileDescriptor(int fd) 690{ 691 flat_binder_object obj; 692 obj.type = BINDER_TYPE_FD; 693 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 694 obj.handle = fd; 695 obj.cookie = (void*)0; 696 return writeObject(obj, true); 697} 698 699status_t Parcel::writeDupFileDescriptor(int fd) 700{ 701 flat_binder_object obj; 702 obj.type = BINDER_TYPE_FD; 703 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 704 obj.handle = dup(fd); 705 obj.cookie = (void*)1; 706 return writeObject(obj, true); 707} 708 709status_t Parcel::write(const Flattenable& val) 710{ 711 status_t err; 712 713 // size if needed 714 size_t len = val.getFlattenedSize(); 715 size_t fd_count = val.getFdCount(); 716 717 err = this->writeInt32(len); 718 if (err) return err; 719 720 err = this->writeInt32(fd_count); 721 if (err) return err; 722 723 // payload 724 void* buf = this->writeInplace(PAD_SIZE(len)); 725 if (buf == NULL) 726 return BAD_VALUE; 727 728 int* fds = NULL; 729 if (fd_count) { 730 fds = new int[fd_count]; 731 } 732 733 err = val.flatten(buf, len, fds, fd_count); 734 for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) { 735 err = this->writeDupFileDescriptor( fds[i] ); 736 } 737 738 if (fd_count) { 739 delete [] fds; 740 } 741 742 return err; 743} 744 745status_t Parcel::writeObject(const flat_binder_object& val, bool nullMetaData) 746{ 747 const bool enoughData = (mDataPos+sizeof(val)) <= mDataCapacity; 748 const bool enoughObjects = mObjectsSize < mObjectsCapacity; 749 if (enoughData && enoughObjects) { 750restart_write: 751 *reinterpret_cast<flat_binder_object*>(mData+mDataPos) = val; 752 753 // Need to write meta-data? 754 if (nullMetaData || val.binder != NULL) { 755 mObjects[mObjectsSize] = mDataPos; 756 acquire_object(ProcessState::self(), val, this); 757 mObjectsSize++; 758 } 759 760 // remember if it's a file descriptor 761 if (val.type == BINDER_TYPE_FD) { 762 mHasFds = mFdsKnown = true; 763 } 764 765 return finishWrite(sizeof(flat_binder_object)); 766 } 767 768 if (!enoughData) { 769 const status_t err = growData(sizeof(val)); 770 if (err != NO_ERROR) return err; 771 } 772 if (!enoughObjects) { 773 size_t newSize = ((mObjectsSize+2)*3)/2; 774 size_t* objects = (size_t*)realloc(mObjects, newSize*sizeof(size_t)); 775 if (objects == NULL) return NO_MEMORY; 776 mObjects = objects; 777 mObjectsCapacity = newSize; 778 } 779 780 goto restart_write; 781} 782 783status_t Parcel::writeNoException() 784{ 785 return writeInt32(0); 786} 787 788void Parcel::remove(size_t start, size_t amt) 789{ 790 LOG_ALWAYS_FATAL("Parcel::remove() not yet implemented!"); 791} 792 793status_t Parcel::read(void* outData, size_t len) const 794{ 795 if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize) { 796 memcpy(outData, mData+mDataPos, len); 797 mDataPos += PAD_SIZE(len); 798 LOGV("read Setting data pos of %p to %d\n", this, mDataPos); 799 return NO_ERROR; 800 } 801 return NOT_ENOUGH_DATA; 802} 803 804const void* Parcel::readInplace(size_t len) const 805{ 806 if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize) { 807 const void* data = mData+mDataPos; 808 mDataPos += PAD_SIZE(len); 809 LOGV("readInplace Setting data pos of %p to %d\n", this, mDataPos); 810 return data; 811 } 812 return NULL; 813} 814 815template<class T> 816status_t Parcel::readAligned(T *pArg) const { 817 COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T)); 818 819 if ((mDataPos+sizeof(T)) <= mDataSize) { 820 const void* data = mData+mDataPos; 821 mDataPos += sizeof(T); 822 *pArg = *reinterpret_cast<const T*>(data); 823 return NO_ERROR; 824 } else { 825 return NOT_ENOUGH_DATA; 826 } 827} 828 829template<class T> 830T Parcel::readAligned() const { 831 T result; 832 if (readAligned(&result) != NO_ERROR) { 833 result = 0; 834 } 835 836 return result; 837} 838 839template<class T> 840status_t Parcel::writeAligned(T val) { 841 COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T)); 842 843 if ((mDataPos+sizeof(val)) <= mDataCapacity) { 844restart_write: 845 *reinterpret_cast<T*>(mData+mDataPos) = val; 846 return finishWrite(sizeof(val)); 847 } 848 849 status_t err = growData(sizeof(val)); 850 if (err == NO_ERROR) goto restart_write; 851 return err; 852} 853 854status_t Parcel::readInt32(int32_t *pArg) const 855{ 856 return readAligned(pArg); 857} 858 859int32_t Parcel::readInt32() const 860{ 861 return readAligned<int32_t>(); 862} 863 864 865status_t Parcel::readInt64(int64_t *pArg) const 866{ 867 return readAligned(pArg); 868} 869 870 871int64_t Parcel::readInt64() const 872{ 873 return readAligned<int64_t>(); 874} 875 876status_t Parcel::readFloat(float *pArg) const 877{ 878 return readAligned(pArg); 879} 880 881 882float Parcel::readFloat() const 883{ 884 return readAligned<float>(); 885} 886 887status_t Parcel::readDouble(double *pArg) const 888{ 889 return readAligned(pArg); 890} 891 892 893double Parcel::readDouble() const 894{ 895 return readAligned<double>(); 896} 897 898status_t Parcel::readIntPtr(intptr_t *pArg) const 899{ 900 return readAligned(pArg); 901} 902 903 904intptr_t Parcel::readIntPtr() const 905{ 906 return readAligned<intptr_t>(); 907} 908 909 910const char* Parcel::readCString() const 911{ 912 const size_t avail = mDataSize-mDataPos; 913 if (avail > 0) { 914 const char* str = reinterpret_cast<const char*>(mData+mDataPos); 915 // is the string's trailing NUL within the parcel's valid bounds? 916 const char* eos = reinterpret_cast<const char*>(memchr(str, 0, avail)); 917 if (eos) { 918 const size_t len = eos - str; 919 mDataPos += PAD_SIZE(len+1); 920 LOGV("readCString Setting data pos of %p to %d\n", this, mDataPos); 921 return str; 922 } 923 } 924 return NULL; 925} 926 927String8 Parcel::readString8() const 928{ 929 int32_t size = readInt32(); 930 // watch for potential int overflow adding 1 for trailing NUL 931 if (size > 0 && size < INT32_MAX) { 932 const char* str = (const char*)readInplace(size+1); 933 if (str) return String8(str, size); 934 } 935 return String8(); 936} 937 938String16 Parcel::readString16() const 939{ 940 size_t len; 941 const char16_t* str = readString16Inplace(&len); 942 if (str) return String16(str, len); 943 LOGE("Reading a NULL string not supported here."); 944 return String16(); 945} 946 947const char16_t* Parcel::readString16Inplace(size_t* outLen) const 948{ 949 int32_t size = readInt32(); 950 // watch for potential int overflow from size+1 951 if (size >= 0 && size < INT32_MAX) { 952 *outLen = size; 953 const char16_t* str = (const char16_t*)readInplace((size+1)*sizeof(char16_t)); 954 if (str != NULL) { 955 return str; 956 } 957 } 958 *outLen = 0; 959 return NULL; 960} 961 962sp<IBinder> Parcel::readStrongBinder() const 963{ 964 sp<IBinder> val; 965 unflatten_binder(ProcessState::self(), *this, &val); 966 return val; 967} 968 969wp<IBinder> Parcel::readWeakBinder() const 970{ 971 wp<IBinder> val; 972 unflatten_binder(ProcessState::self(), *this, &val); 973 return val; 974} 975 976int32_t Parcel::readExceptionCode() const 977{ 978 int32_t exception_code = readAligned<int32_t>(); 979 if (exception_code == EX_HAS_REPLY_HEADER) { 980 int32_t header_size = readAligned<int32_t>(); 981 // Skip over fat responses headers. Not used (or propagated) in 982 // native code 983 setDataPosition(dataPosition() + header_size); 984 // And fat response headers are currently only used when there are no 985 // exceptions, so return no error: 986 return 0; 987 } 988 return exception_code; 989} 990 991native_handle* Parcel::readNativeHandle() const 992{ 993 int numFds, numInts; 994 status_t err; 995 err = readInt32(&numFds); 996 if (err != NO_ERROR) return 0; 997 err = readInt32(&numInts); 998 if (err != NO_ERROR) return 0; 999 1000 native_handle* h = native_handle_create(numFds, numInts); 1001 for (int i=0 ; err==NO_ERROR && i<numFds ; i++) { 1002 h->data[i] = dup(readFileDescriptor()); 1003 if (h->data[i] < 0) err = BAD_VALUE; 1004 } 1005 err = read(h->data + numFds, sizeof(int)*numInts); 1006 if (err != NO_ERROR) { 1007 native_handle_close(h); 1008 native_handle_delete(h); 1009 h = 0; 1010 } 1011 return h; 1012} 1013 1014 1015int Parcel::readFileDescriptor() const 1016{ 1017 const flat_binder_object* flat = readObject(true); 1018 if (flat) { 1019 switch (flat->type) { 1020 case BINDER_TYPE_FD: 1021 //LOGI("Returning file descriptor %ld from parcel %p\n", flat->handle, this); 1022 return flat->handle; 1023 } 1024 } 1025 return BAD_TYPE; 1026} 1027 1028status_t Parcel::read(Flattenable& val) const 1029{ 1030 // size 1031 const size_t len = this->readInt32(); 1032 const size_t fd_count = this->readInt32(); 1033 1034 // payload 1035 void const* buf = this->readInplace(PAD_SIZE(len)); 1036 if (buf == NULL) 1037 return BAD_VALUE; 1038 1039 int* fds = NULL; 1040 if (fd_count) { 1041 fds = new int[fd_count]; 1042 } 1043 1044 status_t err = NO_ERROR; 1045 for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) { 1046 fds[i] = dup(this->readFileDescriptor()); 1047 if (fds[i] < 0) err = BAD_VALUE; 1048 } 1049 1050 if (err == NO_ERROR) { 1051 err = val.unflatten(buf, len, fds, fd_count); 1052 } 1053 1054 if (fd_count) { 1055 delete [] fds; 1056 } 1057 1058 return err; 1059} 1060const flat_binder_object* Parcel::readObject(bool nullMetaData) const 1061{ 1062 const size_t DPOS = mDataPos; 1063 if ((DPOS+sizeof(flat_binder_object)) <= mDataSize) { 1064 const flat_binder_object* obj 1065 = reinterpret_cast<const flat_binder_object*>(mData+DPOS); 1066 mDataPos = DPOS + sizeof(flat_binder_object); 1067 if (!nullMetaData && (obj->cookie == NULL && obj->binder == NULL)) { 1068 // When transferring a NULL object, we don't write it into 1069 // the object list, so we don't want to check for it when 1070 // reading. 1071 LOGV("readObject Setting data pos of %p to %d\n", this, mDataPos); 1072 return obj; 1073 } 1074 1075 // Ensure that this object is valid... 1076 size_t* const OBJS = mObjects; 1077 const size_t N = mObjectsSize; 1078 size_t opos = mNextObjectHint; 1079 1080 if (N > 0) { 1081 LOGV("Parcel %p looking for obj at %d, hint=%d\n", 1082 this, DPOS, opos); 1083 1084 // Start at the current hint position, looking for an object at 1085 // the current data position. 1086 if (opos < N) { 1087 while (opos < (N-1) && OBJS[opos] < DPOS) { 1088 opos++; 1089 } 1090 } else { 1091 opos = N-1; 1092 } 1093 if (OBJS[opos] == DPOS) { 1094 // Found it! 1095 LOGV("Parcel found obj %d at index %d with forward search", 1096 this, DPOS, opos); 1097 mNextObjectHint = opos+1; 1098 LOGV("readObject Setting data pos of %p to %d\n", this, mDataPos); 1099 return obj; 1100 } 1101 1102 // Look backwards for it... 1103 while (opos > 0 && OBJS[opos] > DPOS) { 1104 opos--; 1105 } 1106 if (OBJS[opos] == DPOS) { 1107 // Found it! 1108 LOGV("Parcel found obj %d at index %d with backward search", 1109 this, DPOS, opos); 1110 mNextObjectHint = opos+1; 1111 LOGV("readObject Setting data pos of %p to %d\n", this, mDataPos); 1112 return obj; 1113 } 1114 } 1115 LOGW("Attempt to read object from Parcel %p at offset %d that is not in the object list", 1116 this, DPOS); 1117 } 1118 return NULL; 1119} 1120 1121void Parcel::closeFileDescriptors() 1122{ 1123 size_t i = mObjectsSize; 1124 if (i > 0) { 1125 //LOGI("Closing file descriptors for %d objects...", mObjectsSize); 1126 } 1127 while (i > 0) { 1128 i--; 1129 const flat_binder_object* flat 1130 = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]); 1131 if (flat->type == BINDER_TYPE_FD) { 1132 //LOGI("Closing fd: %ld\n", flat->handle); 1133 close(flat->handle); 1134 } 1135 } 1136} 1137 1138const uint8_t* Parcel::ipcData() const 1139{ 1140 return mData; 1141} 1142 1143size_t Parcel::ipcDataSize() const 1144{ 1145 return (mDataSize > mDataPos ? mDataSize : mDataPos); 1146} 1147 1148const size_t* Parcel::ipcObjects() const 1149{ 1150 return mObjects; 1151} 1152 1153size_t Parcel::ipcObjectsCount() const 1154{ 1155 return mObjectsSize; 1156} 1157 1158void Parcel::ipcSetDataReference(const uint8_t* data, size_t dataSize, 1159 const size_t* objects, size_t objectsCount, release_func relFunc, void* relCookie) 1160{ 1161 freeDataNoInit(); 1162 mError = NO_ERROR; 1163 mData = const_cast<uint8_t*>(data); 1164 mDataSize = mDataCapacity = dataSize; 1165 //LOGI("setDataReference Setting data size of %p to %lu (pid=%d)\n", this, mDataSize, getpid()); 1166 mDataPos = 0; 1167 LOGV("setDataReference Setting data pos of %p to %d\n", this, mDataPos); 1168 mObjects = const_cast<size_t*>(objects); 1169 mObjectsSize = mObjectsCapacity = objectsCount; 1170 mNextObjectHint = 0; 1171 mOwner = relFunc; 1172 mOwnerCookie = relCookie; 1173 scanForFds(); 1174} 1175 1176void Parcel::print(TextOutput& to, uint32_t flags) const 1177{ 1178 to << "Parcel("; 1179 1180 if (errorCheck() != NO_ERROR) { 1181 const status_t err = errorCheck(); 1182 to << "Error: " << (void*)err << " \"" << strerror(-err) << "\""; 1183 } else if (dataSize() > 0) { 1184 const uint8_t* DATA = data(); 1185 to << indent << HexDump(DATA, dataSize()) << dedent; 1186 const size_t* OBJS = objects(); 1187 const size_t N = objectsCount(); 1188 for (size_t i=0; i<N; i++) { 1189 const flat_binder_object* flat 1190 = reinterpret_cast<const flat_binder_object*>(DATA+OBJS[i]); 1191 to << endl << "Object #" << i << " @ " << (void*)OBJS[i] << ": " 1192 << TypeCode(flat->type & 0x7f7f7f00) 1193 << " = " << flat->binder; 1194 } 1195 } else { 1196 to << "NULL"; 1197 } 1198 1199 to << ")"; 1200} 1201 1202void Parcel::releaseObjects() 1203{ 1204 const sp<ProcessState> proc(ProcessState::self()); 1205 size_t i = mObjectsSize; 1206 uint8_t* const data = mData; 1207 size_t* const objects = mObjects; 1208 while (i > 0) { 1209 i--; 1210 const flat_binder_object* flat 1211 = reinterpret_cast<flat_binder_object*>(data+objects[i]); 1212 release_object(proc, *flat, this); 1213 } 1214} 1215 1216void Parcel::acquireObjects() 1217{ 1218 const sp<ProcessState> proc(ProcessState::self()); 1219 size_t i = mObjectsSize; 1220 uint8_t* const data = mData; 1221 size_t* const objects = mObjects; 1222 while (i > 0) { 1223 i--; 1224 const flat_binder_object* flat 1225 = reinterpret_cast<flat_binder_object*>(data+objects[i]); 1226 acquire_object(proc, *flat, this); 1227 } 1228} 1229 1230void Parcel::freeData() 1231{ 1232 freeDataNoInit(); 1233 initState(); 1234} 1235 1236void Parcel::freeDataNoInit() 1237{ 1238 if (mOwner) { 1239 //LOGI("Freeing data ref of %p (pid=%d)\n", this, getpid()); 1240 mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie); 1241 } else { 1242 releaseObjects(); 1243 if (mData) free(mData); 1244 if (mObjects) free(mObjects); 1245 } 1246} 1247 1248status_t Parcel::growData(size_t len) 1249{ 1250 size_t newSize = ((mDataSize+len)*3)/2; 1251 return (newSize <= mDataSize) 1252 ? (status_t) NO_MEMORY 1253 : continueWrite(newSize); 1254} 1255 1256status_t Parcel::restartWrite(size_t desired) 1257{ 1258 if (mOwner) { 1259 freeData(); 1260 return continueWrite(desired); 1261 } 1262 1263 uint8_t* data = (uint8_t*)realloc(mData, desired); 1264 if (!data && desired > mDataCapacity) { 1265 mError = NO_MEMORY; 1266 return NO_MEMORY; 1267 } 1268 1269 releaseObjects(); 1270 1271 if (data) { 1272 mData = data; 1273 mDataCapacity = desired; 1274 } 1275 1276 mDataSize = mDataPos = 0; 1277 LOGV("restartWrite Setting data size of %p to %d\n", this, mDataSize); 1278 LOGV("restartWrite Setting data pos of %p to %d\n", this, mDataPos); 1279 1280 free(mObjects); 1281 mObjects = NULL; 1282 mObjectsSize = mObjectsCapacity = 0; 1283 mNextObjectHint = 0; 1284 mHasFds = false; 1285 mFdsKnown = true; 1286 1287 return NO_ERROR; 1288} 1289 1290status_t Parcel::continueWrite(size_t desired) 1291{ 1292 // If shrinking, first adjust for any objects that appear 1293 // after the new data size. 1294 size_t objectsSize = mObjectsSize; 1295 if (desired < mDataSize) { 1296 if (desired == 0) { 1297 objectsSize = 0; 1298 } else { 1299 while (objectsSize > 0) { 1300 if (mObjects[objectsSize-1] < desired) 1301 break; 1302 objectsSize--; 1303 } 1304 } 1305 } 1306 1307 if (mOwner) { 1308 // If the size is going to zero, just release the owner's data. 1309 if (desired == 0) { 1310 freeData(); 1311 return NO_ERROR; 1312 } 1313 1314 // If there is a different owner, we need to take 1315 // posession. 1316 uint8_t* data = (uint8_t*)malloc(desired); 1317 if (!data) { 1318 mError = NO_MEMORY; 1319 return NO_MEMORY; 1320 } 1321 size_t* objects = NULL; 1322 1323 if (objectsSize) { 1324 objects = (size_t*)malloc(objectsSize*sizeof(size_t)); 1325 if (!objects) { 1326 mError = NO_MEMORY; 1327 return NO_MEMORY; 1328 } 1329 1330 // Little hack to only acquire references on objects 1331 // we will be keeping. 1332 size_t oldObjectsSize = mObjectsSize; 1333 mObjectsSize = objectsSize; 1334 acquireObjects(); 1335 mObjectsSize = oldObjectsSize; 1336 } 1337 1338 if (mData) { 1339 memcpy(data, mData, mDataSize < desired ? mDataSize : desired); 1340 } 1341 if (objects && mObjects) { 1342 memcpy(objects, mObjects, objectsSize*sizeof(size_t)); 1343 } 1344 //LOGI("Freeing data ref of %p (pid=%d)\n", this, getpid()); 1345 mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie); 1346 mOwner = NULL; 1347 1348 mData = data; 1349 mObjects = objects; 1350 mDataSize = (mDataSize < desired) ? mDataSize : desired; 1351 LOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize); 1352 mDataCapacity = desired; 1353 mObjectsSize = mObjectsCapacity = objectsSize; 1354 mNextObjectHint = 0; 1355 1356 } else if (mData) { 1357 if (objectsSize < mObjectsSize) { 1358 // Need to release refs on any objects we are dropping. 1359 const sp<ProcessState> proc(ProcessState::self()); 1360 for (size_t i=objectsSize; i<mObjectsSize; i++) { 1361 const flat_binder_object* flat 1362 = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]); 1363 if (flat->type == BINDER_TYPE_FD) { 1364 // will need to rescan because we may have lopped off the only FDs 1365 mFdsKnown = false; 1366 } 1367 release_object(proc, *flat, this); 1368 } 1369 size_t* objects = 1370 (size_t*)realloc(mObjects, objectsSize*sizeof(size_t)); 1371 if (objects) { 1372 mObjects = objects; 1373 } 1374 mObjectsSize = objectsSize; 1375 mNextObjectHint = 0; 1376 } 1377 1378 // We own the data, so we can just do a realloc(). 1379 if (desired > mDataCapacity) { 1380 uint8_t* data = (uint8_t*)realloc(mData, desired); 1381 if (data) { 1382 mData = data; 1383 mDataCapacity = desired; 1384 } else if (desired > mDataCapacity) { 1385 mError = NO_MEMORY; 1386 return NO_MEMORY; 1387 } 1388 } else { 1389 if (mDataSize > desired) { 1390 mDataSize = desired; 1391 LOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize); 1392 } 1393 if (mDataPos > desired) { 1394 mDataPos = desired; 1395 LOGV("continueWrite Setting data pos of %p to %d\n", this, mDataPos); 1396 } 1397 } 1398 1399 } else { 1400 // This is the first data. Easy! 1401 uint8_t* data = (uint8_t*)malloc(desired); 1402 if (!data) { 1403 mError = NO_MEMORY; 1404 return NO_MEMORY; 1405 } 1406 1407 if(!(mDataCapacity == 0 && mObjects == NULL 1408 && mObjectsCapacity == 0)) { 1409 LOGE("continueWrite: %d/%p/%d/%d", mDataCapacity, mObjects, mObjectsCapacity, desired); 1410 } 1411 1412 mData = data; 1413 mDataSize = mDataPos = 0; 1414 LOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize); 1415 LOGV("continueWrite Setting data pos of %p to %d\n", this, mDataPos); 1416 mDataCapacity = desired; 1417 } 1418 1419 return NO_ERROR; 1420} 1421 1422void Parcel::initState() 1423{ 1424 mError = NO_ERROR; 1425 mData = 0; 1426 mDataSize = 0; 1427 mDataCapacity = 0; 1428 mDataPos = 0; 1429 LOGV("initState Setting data size of %p to %d\n", this, mDataSize); 1430 LOGV("initState Setting data pos of %p to %d\n", this, mDataPos); 1431 mObjects = NULL; 1432 mObjectsSize = 0; 1433 mObjectsCapacity = 0; 1434 mNextObjectHint = 0; 1435 mHasFds = false; 1436 mFdsKnown = true; 1437 mOwner = NULL; 1438} 1439 1440void Parcel::scanForFds() const 1441{ 1442 bool hasFds = false; 1443 for (size_t i=0; i<mObjectsSize; i++) { 1444 const flat_binder_object* flat 1445 = reinterpret_cast<const flat_binder_object*>(mData + mObjects[i]); 1446 if (flat->type == BINDER_TYPE_FD) { 1447 hasFds = true; 1448 break; 1449 } 1450 } 1451 mHasFds = hasFds; 1452 mFdsKnown = true; 1453} 1454 1455}; // namespace android 1456