Parcel.cpp revision 208059f67ed2dd9fa025e07fcb6954d3cb61c79e
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 <utils/Parcel.h> 21 22#include <utils/Binder.h> 23#include <utils/BpBinder.h> 24#include <utils/Debug.h> 25#include <utils/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 const flat_binder_object* flat 413 = reinterpret_cast<flat_binder_object*>(mData + off); 414 acquire_object(proc, *flat, this); 415 416 // take note if the object is a file descriptor 417 if (flat->type == BINDER_TYPE_FD) { 418 mHasFds = mFdsKnown = true; 419 } 420 } 421 } 422 423 return NO_ERROR; 424} 425 426bool Parcel::hasFileDescriptors() const 427{ 428 if (!mFdsKnown) { 429 scanForFds(); 430 } 431 return mHasFds; 432} 433 434status_t Parcel::writeInterfaceToken(const String16& interface) 435{ 436 // currently the interface identification token is just its name as a string 437 return writeString16(interface); 438} 439 440bool Parcel::enforceInterface(const String16& interface) const 441{ 442 String16 str = readString16(); 443 if (str == interface) { 444 return true; 445 } else { 446 LOGW("**** enforceInterface() expected '%s' but read '%s'\n", 447 String8(interface).string(), String8(str).string()); 448 return false; 449 } 450} 451 452const size_t* Parcel::objects() const 453{ 454 return mObjects; 455} 456 457size_t Parcel::objectsCount() const 458{ 459 return mObjectsSize; 460} 461 462status_t Parcel::errorCheck() const 463{ 464 return mError; 465} 466 467void Parcel::setError(status_t err) 468{ 469 mError = err; 470} 471 472status_t Parcel::finishWrite(size_t len) 473{ 474 //printf("Finish write of %d\n", len); 475 mDataPos += len; 476 LOGV("finishWrite Setting data pos of %p to %d\n", this, mDataPos); 477 if (mDataPos > mDataSize) { 478 mDataSize = mDataPos; 479 LOGV("finishWrite Setting data size of %p to %d\n", this, mDataSize); 480 } 481 //printf("New pos=%d, size=%d\n", mDataPos, mDataSize); 482 return NO_ERROR; 483} 484 485status_t Parcel::writeUnpadded(const void* data, size_t len) 486{ 487 size_t end = mDataPos + len; 488 if (end < mDataPos) { 489 // integer overflow 490 return BAD_VALUE; 491 } 492 493 if (end <= mDataCapacity) { 494restart_write: 495 memcpy(mData+mDataPos, data, len); 496 return finishWrite(len); 497 } 498 499 status_t err = growData(len); 500 if (err == NO_ERROR) goto restart_write; 501 return err; 502} 503 504status_t Parcel::write(const void* data, size_t len) 505{ 506 void* const d = writeInplace(len); 507 if (d) { 508 memcpy(d, data, len); 509 return NO_ERROR; 510 } 511 return mError; 512} 513 514void* Parcel::writeInplace(size_t len) 515{ 516 const size_t padded = PAD_SIZE(len); 517 518 // sanity check for integer overflow 519 if (mDataPos+padded < mDataPos) { 520 return NULL; 521 } 522 523 if ((mDataPos+padded) <= mDataCapacity) { 524restart_write: 525 //printf("Writing %ld bytes, padded to %ld\n", len, padded); 526 uint8_t* const data = mData+mDataPos; 527 528 // Need to pad at end? 529 if (padded != len) { 530#if BYTE_ORDER == BIG_ENDIAN 531 static const uint32_t mask[4] = { 532 0x00000000, 0xffffff00, 0xffff0000, 0xff000000 533 }; 534#endif 535#if BYTE_ORDER == LITTLE_ENDIAN 536 static const uint32_t mask[4] = { 537 0x00000000, 0x00ffffff, 0x0000ffff, 0x000000ff 538 }; 539#endif 540 //printf("Applying pad mask: %p to %p\n", (void*)mask[padded-len], 541 // *reinterpret_cast<void**>(data+padded-4)); 542 *reinterpret_cast<uint32_t*>(data+padded-4) &= mask[padded-len]; 543 } 544 545 finishWrite(padded); 546 return data; 547 } 548 549 status_t err = growData(padded); 550 if (err == NO_ERROR) goto restart_write; 551 return NULL; 552} 553 554status_t Parcel::writeInt32(int32_t val) 555{ 556 if ((mDataPos+sizeof(val)) <= mDataCapacity) { 557restart_write: 558 *reinterpret_cast<int32_t*>(mData+mDataPos) = val; 559 return finishWrite(sizeof(val)); 560 } 561 562 status_t err = growData(sizeof(val)); 563 if (err == NO_ERROR) goto restart_write; 564 return err; 565} 566 567status_t Parcel::writeInt64(int64_t val) 568{ 569 if ((mDataPos+sizeof(val)) <= mDataCapacity) { 570restart_write: 571 *reinterpret_cast<int64_t*>(mData+mDataPos) = val; 572 return finishWrite(sizeof(val)); 573 } 574 575 status_t err = growData(sizeof(val)); 576 if (err == NO_ERROR) goto restart_write; 577 return err; 578} 579 580status_t Parcel::writeFloat(float val) 581{ 582 if ((mDataPos+sizeof(val)) <= mDataCapacity) { 583restart_write: 584 *reinterpret_cast<float*>(mData+mDataPos) = val; 585 return finishWrite(sizeof(val)); 586 } 587 588 status_t err = growData(sizeof(val)); 589 if (err == NO_ERROR) goto restart_write; 590 return err; 591} 592 593status_t Parcel::writeDouble(double val) 594{ 595 if ((mDataPos+sizeof(val)) <= mDataCapacity) { 596restart_write: 597 *reinterpret_cast<double*>(mData+mDataPos) = val; 598 return finishWrite(sizeof(val)); 599 } 600 601 status_t err = growData(sizeof(val)); 602 if (err == NO_ERROR) goto restart_write; 603 return err; 604} 605 606status_t Parcel::writeCString(const char* str) 607{ 608 return write(str, strlen(str)+1); 609} 610 611status_t Parcel::writeString8(const String8& str) 612{ 613 status_t err = writeInt32(str.bytes()); 614 if (err == NO_ERROR) { 615 err = write(str.string(), str.bytes()+1); 616 } 617 return err; 618} 619 620status_t Parcel::writeString16(const String16& str) 621{ 622 return writeString16(str.string(), str.size()); 623} 624 625status_t Parcel::writeString16(const char16_t* str, size_t len) 626{ 627 if (str == NULL) return writeInt32(-1); 628 629 status_t err = writeInt32(len); 630 if (err == NO_ERROR) { 631 len *= sizeof(char16_t); 632 uint8_t* data = (uint8_t*)writeInplace(len+sizeof(char16_t)); 633 if (data) { 634 memcpy(data, str, len); 635 *reinterpret_cast<char16_t*>(data+len) = 0; 636 return NO_ERROR; 637 } 638 err = mError; 639 } 640 return err; 641} 642 643status_t Parcel::writeStrongBinder(const sp<IBinder>& val) 644{ 645 return flatten_binder(ProcessState::self(), val, this); 646} 647 648status_t Parcel::writeWeakBinder(const wp<IBinder>& val) 649{ 650 return flatten_binder(ProcessState::self(), val, this); 651} 652 653status_t Parcel::writeNativeHandle(const native_handle& handle) 654{ 655 if (handle.version != sizeof(native_handle)) 656 return BAD_TYPE; 657 658 status_t err; 659 err = writeInt32(handle.numFds); 660 if (err != NO_ERROR) return err; 661 662 err = writeInt32(handle.numInts); 663 if (err != NO_ERROR) return err; 664 665 for (int i=0 ; err==NO_ERROR && i<handle.numFds ; i++) 666 err = writeDupFileDescriptor(handle.data[i]); 667 668 if (err != NO_ERROR) { 669 LOGD("write native handle, write dup fd failed"); 670 return err; 671 } 672 673 err = write(handle.data + handle.numFds, sizeof(int)*handle.numInts); 674 675 return err; 676} 677 678status_t Parcel::writeFileDescriptor(int fd) 679{ 680 flat_binder_object obj; 681 obj.type = BINDER_TYPE_FD; 682 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 683 obj.handle = fd; 684 obj.cookie = (void*)0; 685 return writeObject(obj, true); 686} 687 688status_t Parcel::writeDupFileDescriptor(int fd) 689{ 690 flat_binder_object obj; 691 obj.type = BINDER_TYPE_FD; 692 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 693 obj.handle = dup(fd); 694 obj.cookie = (void*)1; 695 return writeObject(obj, true); 696} 697 698status_t Parcel::writeObject(const flat_binder_object& val, bool nullMetaData) 699{ 700 const bool enoughData = (mDataPos+sizeof(val)) <= mDataCapacity; 701 const bool enoughObjects = mObjectsSize < mObjectsCapacity; 702 if (enoughData && enoughObjects) { 703restart_write: 704 *reinterpret_cast<flat_binder_object*>(mData+mDataPos) = val; 705 706 // Need to write meta-data? 707 if (nullMetaData || val.binder != NULL) { 708 mObjects[mObjectsSize] = mDataPos; 709 acquire_object(ProcessState::self(), val, this); 710 mObjectsSize++; 711 } 712 713 // remember if it's a file descriptor 714 if (val.type == BINDER_TYPE_FD) { 715 mHasFds = mFdsKnown = true; 716 } 717 718 return finishWrite(sizeof(flat_binder_object)); 719 } 720 721 if (!enoughData) { 722 const status_t err = growData(sizeof(val)); 723 if (err != NO_ERROR) return err; 724 } 725 if (!enoughObjects) { 726 size_t newSize = ((mObjectsSize+2)*3)/2; 727 size_t* objects = (size_t*)realloc(mObjects, newSize*sizeof(size_t)); 728 if (objects == NULL) return NO_MEMORY; 729 mObjects = objects; 730 mObjectsCapacity = newSize; 731 } 732 733 goto restart_write; 734} 735 736 737void Parcel::remove(size_t start, size_t amt) 738{ 739 LOG_ALWAYS_FATAL("Parcel::remove() not yet implemented!"); 740} 741 742status_t Parcel::read(void* outData, size_t len) const 743{ 744 if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize) { 745 memcpy(outData, mData+mDataPos, len); 746 mDataPos += PAD_SIZE(len); 747 LOGV("read Setting data pos of %p to %d\n", this, mDataPos); 748 return NO_ERROR; 749 } 750 return NOT_ENOUGH_DATA; 751} 752 753const void* Parcel::readInplace(size_t len) const 754{ 755 if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize) { 756 const void* data = mData+mDataPos; 757 mDataPos += PAD_SIZE(len); 758 LOGV("readInplace Setting data pos of %p to %d\n", this, mDataPos); 759 return data; 760 } 761 return NULL; 762} 763 764status_t Parcel::readInt32(int32_t *pArg) const 765{ 766 if ((mDataPos+sizeof(int32_t)) <= mDataSize) { 767 const void* data = mData+mDataPos; 768 mDataPos += sizeof(int32_t); 769 *pArg = *reinterpret_cast<const int32_t*>(data); 770 return NO_ERROR; 771 } else { 772 return NOT_ENOUGH_DATA; 773 } 774} 775 776int32_t Parcel::readInt32() const 777{ 778 if ((mDataPos+sizeof(int32_t)) <= mDataSize) { 779 const void* data = mData+mDataPos; 780 mDataPos += sizeof(int32_t); 781 LOGV("readInt32 Setting data pos of %p to %d\n", this, mDataPos); 782 return *reinterpret_cast<const int32_t*>(data); 783 } 784 return 0; 785} 786 787 788status_t Parcel::readInt64(int64_t *pArg) const 789{ 790 if ((mDataPos+sizeof(int64_t)) <= mDataSize) { 791 const void* data = mData+mDataPos; 792 mDataPos += sizeof(int64_t); 793 *pArg = *reinterpret_cast<const int64_t*>(data); 794 LOGV("readInt64 Setting data pos of %p to %d\n", this, mDataPos); 795 return NO_ERROR; 796 } else { 797 return NOT_ENOUGH_DATA; 798 } 799} 800 801 802int64_t Parcel::readInt64() const 803{ 804 if ((mDataPos+sizeof(int64_t)) <= mDataSize) { 805 const void* data = mData+mDataPos; 806 mDataPos += sizeof(int64_t); 807 LOGV("readInt64 Setting data pos of %p to %d\n", this, mDataPos); 808 return *reinterpret_cast<const int64_t*>(data); 809 } 810 return 0; 811} 812 813status_t Parcel::readFloat(float *pArg) const 814{ 815 if ((mDataPos+sizeof(float)) <= mDataSize) { 816 const void* data = mData+mDataPos; 817 mDataPos += sizeof(float); 818 LOGV("readFloat Setting data pos of %p to %d\n", this, mDataPos); 819 *pArg = *reinterpret_cast<const float*>(data); 820 return NO_ERROR; 821 } else { 822 return NOT_ENOUGH_DATA; 823 } 824} 825 826 827float Parcel::readFloat() const 828{ 829 if ((mDataPos+sizeof(float)) <= mDataSize) { 830 const void* data = mData+mDataPos; 831 mDataPos += sizeof(float); 832 LOGV("readFloat Setting data pos of %p to %d\n", this, mDataPos); 833 return *reinterpret_cast<const float*>(data); 834 } 835 return 0; 836} 837 838status_t Parcel::readDouble(double *pArg) const 839{ 840 if ((mDataPos+sizeof(double)) <= mDataSize) { 841 const void* data = mData+mDataPos; 842 mDataPos += sizeof(double); 843 LOGV("readDouble Setting data pos of %p to %d\n", this, mDataPos); 844 *pArg = *reinterpret_cast<const double*>(data); 845 return NO_ERROR; 846 } else { 847 return NOT_ENOUGH_DATA; 848 } 849} 850 851 852double Parcel::readDouble() const 853{ 854 if ((mDataPos+sizeof(double)) <= mDataSize) { 855 const void* data = mData+mDataPos; 856 mDataPos += sizeof(double); 857 LOGV("readDouble Setting data pos of %p to %d\n", this, mDataPos); 858 return *reinterpret_cast<const double*>(data); 859 } 860 return 0; 861} 862 863 864const char* Parcel::readCString() const 865{ 866 const size_t avail = mDataSize-mDataPos; 867 if (avail > 0) { 868 const char* str = reinterpret_cast<const char*>(mData+mDataPos); 869 // is the string's trailing NUL within the parcel's valid bounds? 870 const char* eos = reinterpret_cast<const char*>(memchr(str, 0, avail)); 871 if (eos) { 872 const size_t len = eos - str; 873 mDataPos += PAD_SIZE(len+1); 874 LOGV("readCString Setting data pos of %p to %d\n", this, mDataPos); 875 return str; 876 } 877 } 878 return NULL; 879} 880 881String8 Parcel::readString8() const 882{ 883 int32_t size = readInt32(); 884 // watch for potential int overflow adding 1 for trailing NUL 885 if (size > 0 && size < INT32_MAX) { 886 const char* str = (const char*)readInplace(size+1); 887 if (str) return String8(str, size); 888 } 889 return String8(); 890} 891 892String16 Parcel::readString16() const 893{ 894 size_t len; 895 const char16_t* str = readString16Inplace(&len); 896 if (str) return String16(str, len); 897 LOGE("Reading a NULL string not supported here."); 898 return String16(); 899} 900 901const char16_t* Parcel::readString16Inplace(size_t* outLen) const 902{ 903 int32_t size = readInt32(); 904 // watch for potential int overflow from size+1 905 if (size >= 0 && size < INT32_MAX) { 906 *outLen = size; 907 const char16_t* str = (const char16_t*)readInplace((size+1)*sizeof(char16_t)); 908 if (str != NULL) { 909 return str; 910 } 911 } 912 *outLen = 0; 913 return NULL; 914} 915 916sp<IBinder> Parcel::readStrongBinder() const 917{ 918 sp<IBinder> val; 919 unflatten_binder(ProcessState::self(), *this, &val); 920 return val; 921} 922 923wp<IBinder> Parcel::readWeakBinder() const 924{ 925 wp<IBinder> val; 926 unflatten_binder(ProcessState::self(), *this, &val); 927 return val; 928} 929 930 931native_handle* Parcel::readNativeHandle(native_handle* (*alloc)(void*, int, int), void* cookie) const 932{ 933 int numFds, numInts; 934 status_t err; 935 err = readInt32(&numFds); 936 if (err != NO_ERROR) return 0; 937 err = readInt32(&numInts); 938 if (err != NO_ERROR) return 0; 939 940 native_handle* h; 941 if (alloc == 0) { 942 size_t size = sizeof(native_handle) + sizeof(int)*(numFds + numInts); 943 h = (native_handle*)malloc(size); 944 h->version = sizeof(native_handle); 945 h->numFds = numFds; 946 h->numInts = numInts; 947 } else { 948 h = alloc(cookie, numFds, numInts); 949 if (h->version != sizeof(native_handle)) { 950 return 0; 951 } 952 } 953 for (int i=0 ; err==NO_ERROR && i<numFds ; i++) { 954 h->data[i] = dup(readFileDescriptor()); 955 if (h->data[i] < 0) err = BAD_VALUE; 956 } 957 958 err = read(h->data + numFds, sizeof(int)*numInts); 959 960 if (err != NO_ERROR) { 961 if (alloc == 0) { 962 free(h); 963 } 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 983const flat_binder_object* Parcel::readObject(bool nullMetaData) const 984{ 985 const size_t DPOS = mDataPos; 986 if ((DPOS+sizeof(flat_binder_object)) <= mDataSize) { 987 const flat_binder_object* obj 988 = reinterpret_cast<const flat_binder_object*>(mData+DPOS); 989 mDataPos = DPOS + sizeof(flat_binder_object); 990 if (!nullMetaData && (obj->cookie == NULL && obj->binder == NULL)) { 991 // When transferring a NULL object, we don't write it into 992 // the object list, so we don't want to check for it when 993 // reading. 994 LOGV("readObject Setting data pos of %p to %d\n", this, mDataPos); 995 return obj; 996 } 997 998 // Ensure that this object is valid... 999 size_t* const OBJS = mObjects; 1000 const size_t N = mObjectsSize; 1001 size_t opos = mNextObjectHint; 1002 1003 if (N > 0) { 1004 LOGV("Parcel %p looking for obj at %d, hint=%d\n", 1005 this, DPOS, opos); 1006 1007 // Start at the current hint position, looking for an object at 1008 // the current data position. 1009 if (opos < N) { 1010 while (opos < (N-1) && OBJS[opos] < DPOS) { 1011 opos++; 1012 } 1013 } else { 1014 opos = N-1; 1015 } 1016 if (OBJS[opos] == DPOS) { 1017 // Found it! 1018 LOGV("Parcel found obj %d at index %d with forward search", 1019 this, DPOS, opos); 1020 mNextObjectHint = opos+1; 1021 LOGV("readObject Setting data pos of %p to %d\n", this, mDataPos); 1022 return obj; 1023 } 1024 1025 // Look backwards for it... 1026 while (opos > 0 && OBJS[opos] > DPOS) { 1027 opos--; 1028 } 1029 if (OBJS[opos] == DPOS) { 1030 // Found it! 1031 LOGV("Parcel found obj %d at index %d with backward search", 1032 this, DPOS, opos); 1033 mNextObjectHint = opos+1; 1034 LOGV("readObject Setting data pos of %p to %d\n", this, mDataPos); 1035 return obj; 1036 } 1037 } 1038 LOGW("Attempt to read object from Parcel %p at offset %d that is not in the object list", 1039 this, DPOS); 1040 } 1041 return NULL; 1042} 1043 1044void Parcel::closeFileDescriptors() 1045{ 1046 size_t i = mObjectsSize; 1047 if (i > 0) { 1048 //LOGI("Closing file descriptors for %d objects...", mObjectsSize); 1049 } 1050 while (i > 0) { 1051 i--; 1052 const flat_binder_object* flat 1053 = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]); 1054 if (flat->type == BINDER_TYPE_FD) { 1055 //LOGI("Closing fd: %ld\n", flat->handle); 1056 close(flat->handle); 1057 } 1058 } 1059} 1060 1061const uint8_t* Parcel::ipcData() const 1062{ 1063 return mData; 1064} 1065 1066size_t Parcel::ipcDataSize() const 1067{ 1068 return (mDataSize > mDataPos ? mDataSize : mDataPos); 1069} 1070 1071const size_t* Parcel::ipcObjects() const 1072{ 1073 return mObjects; 1074} 1075 1076size_t Parcel::ipcObjectsCount() const 1077{ 1078 return mObjectsSize; 1079} 1080 1081void Parcel::ipcSetDataReference(const uint8_t* data, size_t dataSize, 1082 const size_t* objects, size_t objectsCount, release_func relFunc, void* relCookie) 1083{ 1084 freeDataNoInit(); 1085 mError = NO_ERROR; 1086 mData = const_cast<uint8_t*>(data); 1087 mDataSize = mDataCapacity = dataSize; 1088 //LOGI("setDataReference Setting data size of %p to %lu (pid=%d)\n", this, mDataSize, getpid()); 1089 mDataPos = 0; 1090 LOGV("setDataReference Setting data pos of %p to %d\n", this, mDataPos); 1091 mObjects = const_cast<size_t*>(objects); 1092 mObjectsSize = mObjectsCapacity = objectsCount; 1093 mNextObjectHint = 0; 1094 mOwner = relFunc; 1095 mOwnerCookie = relCookie; 1096 scanForFds(); 1097} 1098 1099void Parcel::print(TextOutput& to, uint32_t flags) const 1100{ 1101 to << "Parcel("; 1102 1103 if (errorCheck() != NO_ERROR) { 1104 const status_t err = errorCheck(); 1105 to << "Error: " << (void*)err << " \"" << strerror(-err) << "\""; 1106 } else if (dataSize() > 0) { 1107 const uint8_t* DATA = data(); 1108 to << indent << HexDump(DATA, dataSize()) << dedent; 1109 const size_t* OBJS = objects(); 1110 const size_t N = objectsCount(); 1111 for (size_t i=0; i<N; i++) { 1112 const flat_binder_object* flat 1113 = reinterpret_cast<const flat_binder_object*>(DATA+OBJS[i]); 1114 to << endl << "Object #" << i << " @ " << (void*)OBJS[i] << ": " 1115 << TypeCode(flat->type & 0x7f7f7f00) 1116 << " = " << flat->binder; 1117 } 1118 } else { 1119 to << "NULL"; 1120 } 1121 1122 to << ")"; 1123} 1124 1125void Parcel::releaseObjects() 1126{ 1127 const sp<ProcessState> proc(ProcessState::self()); 1128 size_t i = mObjectsSize; 1129 uint8_t* const data = mData; 1130 size_t* const objects = mObjects; 1131 while (i > 0) { 1132 i--; 1133 const flat_binder_object* flat 1134 = reinterpret_cast<flat_binder_object*>(data+objects[i]); 1135 release_object(proc, *flat, this); 1136 } 1137} 1138 1139void Parcel::acquireObjects() 1140{ 1141 const sp<ProcessState> proc(ProcessState::self()); 1142 size_t i = mObjectsSize; 1143 uint8_t* const data = mData; 1144 size_t* const objects = mObjects; 1145 while (i > 0) { 1146 i--; 1147 const flat_binder_object* flat 1148 = reinterpret_cast<flat_binder_object*>(data+objects[i]); 1149 acquire_object(proc, *flat, this); 1150 } 1151} 1152 1153void Parcel::freeData() 1154{ 1155 freeDataNoInit(); 1156 initState(); 1157} 1158 1159void Parcel::freeDataNoInit() 1160{ 1161 if (mOwner) { 1162 //LOGI("Freeing data ref of %p (pid=%d)\n", this, getpid()); 1163 mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie); 1164 } else { 1165 releaseObjects(); 1166 if (mData) free(mData); 1167 if (mObjects) free(mObjects); 1168 } 1169} 1170 1171status_t Parcel::growData(size_t len) 1172{ 1173 size_t newSize = ((mDataSize+len)*3)/2; 1174 return (newSize <= mDataSize) 1175 ? (status_t) NO_MEMORY 1176 : continueWrite(newSize); 1177} 1178 1179status_t Parcel::restartWrite(size_t desired) 1180{ 1181 if (mOwner) { 1182 freeData(); 1183 return continueWrite(desired); 1184 } 1185 1186 uint8_t* data = (uint8_t*)realloc(mData, desired); 1187 if (!data && desired > mDataCapacity) { 1188 mError = NO_MEMORY; 1189 return NO_MEMORY; 1190 } 1191 1192 releaseObjects(); 1193 1194 if (data) { 1195 mData = data; 1196 mDataCapacity = desired; 1197 } 1198 1199 mDataSize = mDataPos = 0; 1200 LOGV("restartWrite Setting data size of %p to %d\n", this, mDataSize); 1201 LOGV("restartWrite Setting data pos of %p to %d\n", this, mDataPos); 1202 1203 free(mObjects); 1204 mObjects = NULL; 1205 mObjectsSize = mObjectsCapacity = 0; 1206 mNextObjectHint = 0; 1207 mHasFds = false; 1208 mFdsKnown = true; 1209 1210 return NO_ERROR; 1211} 1212 1213status_t Parcel::continueWrite(size_t desired) 1214{ 1215 // If shrinking, first adjust for any objects that appear 1216 // after the new data size. 1217 size_t objectsSize = mObjectsSize; 1218 if (desired < mDataSize) { 1219 if (desired == 0) { 1220 objectsSize = 0; 1221 } else { 1222 while (objectsSize > 0) { 1223 if (mObjects[objectsSize-1] < desired) 1224 break; 1225 objectsSize--; 1226 } 1227 } 1228 } 1229 1230 if (mOwner) { 1231 // If the size is going to zero, just release the owner's data. 1232 if (desired == 0) { 1233 freeData(); 1234 return NO_ERROR; 1235 } 1236 1237 // If there is a different owner, we need to take 1238 // posession. 1239 uint8_t* data = (uint8_t*)malloc(desired); 1240 if (!data) { 1241 mError = NO_MEMORY; 1242 return NO_MEMORY; 1243 } 1244 size_t* objects = NULL; 1245 1246 if (objectsSize) { 1247 objects = (size_t*)malloc(objectsSize*sizeof(size_t)); 1248 if (!objects) { 1249 mError = NO_MEMORY; 1250 return NO_MEMORY; 1251 } 1252 1253 // Little hack to only acquire references on objects 1254 // we will be keeping. 1255 size_t oldObjectsSize = mObjectsSize; 1256 mObjectsSize = objectsSize; 1257 acquireObjects(); 1258 mObjectsSize = oldObjectsSize; 1259 } 1260 1261 if (mData) { 1262 memcpy(data, mData, mDataSize < desired ? mDataSize : desired); 1263 } 1264 if (objects && mObjects) { 1265 memcpy(objects, mObjects, objectsSize*sizeof(size_t)); 1266 } 1267 //LOGI("Freeing data ref of %p (pid=%d)\n", this, getpid()); 1268 mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie); 1269 mOwner = NULL; 1270 1271 mData = data; 1272 mObjects = objects; 1273 mDataSize = (mDataSize < desired) ? mDataSize : desired; 1274 LOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize); 1275 mDataCapacity = desired; 1276 mObjectsSize = mObjectsCapacity = objectsSize; 1277 mNextObjectHint = 0; 1278 1279 } else if (mData) { 1280 if (objectsSize < mObjectsSize) { 1281 // Need to release refs on any objects we are dropping. 1282 const sp<ProcessState> proc(ProcessState::self()); 1283 for (size_t i=objectsSize; i<mObjectsSize; i++) { 1284 const flat_binder_object* flat 1285 = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]); 1286 if (flat->type == BINDER_TYPE_FD) { 1287 // will need to rescan because we may have lopped off the only FDs 1288 mFdsKnown = false; 1289 } 1290 release_object(proc, *flat, this); 1291 } 1292 size_t* objects = 1293 (size_t*)realloc(mObjects, objectsSize*sizeof(size_t)); 1294 if (objects) { 1295 mObjects = objects; 1296 } 1297 mObjectsSize = objectsSize; 1298 mNextObjectHint = 0; 1299 } 1300 1301 // We own the data, so we can just do a realloc(). 1302 if (desired > mDataCapacity) { 1303 uint8_t* data = (uint8_t*)realloc(mData, desired); 1304 if (data) { 1305 mData = data; 1306 mDataCapacity = desired; 1307 } else if (desired > mDataCapacity) { 1308 mError = NO_MEMORY; 1309 return NO_MEMORY; 1310 } 1311 } else { 1312 mDataSize = desired; 1313 LOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize); 1314 if (mDataPos > desired) { 1315 mDataPos = desired; 1316 LOGV("continueWrite Setting data pos of %p to %d\n", this, mDataPos); 1317 } 1318 } 1319 1320 } else { 1321 // This is the first data. Easy! 1322 uint8_t* data = (uint8_t*)malloc(desired); 1323 if (!data) { 1324 mError = NO_MEMORY; 1325 return NO_MEMORY; 1326 } 1327 1328 if(!(mDataCapacity == 0 && mObjects == NULL 1329 && mObjectsCapacity == 0)) { 1330 LOGE("continueWrite: %d/%p/%d/%d", mDataCapacity, mObjects, mObjectsCapacity, desired); 1331 } 1332 1333 mData = data; 1334 mDataSize = mDataPos = 0; 1335 LOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize); 1336 LOGV("continueWrite Setting data pos of %p to %d\n", this, mDataPos); 1337 mDataCapacity = desired; 1338 } 1339 1340 return NO_ERROR; 1341} 1342 1343void Parcel::initState() 1344{ 1345 mError = NO_ERROR; 1346 mData = 0; 1347 mDataSize = 0; 1348 mDataCapacity = 0; 1349 mDataPos = 0; 1350 LOGV("initState Setting data size of %p to %d\n", this, mDataSize); 1351 LOGV("initState Setting data pos of %p to %d\n", this, mDataPos); 1352 mObjects = NULL; 1353 mObjectsSize = 0; 1354 mObjectsCapacity = 0; 1355 mNextObjectHint = 0; 1356 mHasFds = false; 1357 mFdsKnown = true; 1358 mOwner = NULL; 1359} 1360 1361void Parcel::scanForFds() const 1362{ 1363 bool hasFds = false; 1364 for (size_t i=0; i<mObjectsSize; i++) { 1365 const flat_binder_object* flat 1366 = reinterpret_cast<const flat_binder_object*>(mData + mObjects[i]); 1367 if (flat->type == BINDER_TYPE_FD) { 1368 hasFds = true; 1369 break; 1370 } 1371 } 1372 mHasFds = hasFds; 1373 mFdsKnown = true; 1374} 1375 1376}; // namespace android 1377