Parcel.cpp revision 41a0f2f86c0ca7d2fef50aef6215987f445a7231
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 <binder/ProcessState.h> 26#include <binder/TextOutput.h> 27 28#include <errno.h> 29#include <utils/CallStack.h> 30#include <utils/Debug.h> 31#include <utils/Log.h> 32#include <utils/String8.h> 33#include <utils/String16.h> 34#include <utils/misc.h> 35#include <utils/Flattenable.h> 36#include <cutils/ashmem.h> 37 38#include <private/binder/binder_module.h> 39 40#include <fcntl.h> 41#include <inttypes.h> 42#include <stdio.h> 43#include <stdlib.h> 44#include <stdint.h> 45#include <sys/mman.h> 46 47#ifndef INT32_MAX 48#define INT32_MAX ((int32_t)(2147483647)) 49#endif 50 51#define LOG_REFS(...) 52//#define LOG_REFS(...) ALOG(LOG_DEBUG, "Parcel", __VA_ARGS__) 53 54// --------------------------------------------------------------------------- 55 56#define PAD_SIZE(s) (((s)+3)&~3) 57 58// Note: must be kept in sync with android/os/StrictMode.java's PENALTY_GATHER 59#define STRICT_MODE_PENALTY_GATHER 0x100 60 61// Note: must be kept in sync with android/os/Parcel.java's EX_HAS_REPLY_HEADER 62#define EX_HAS_REPLY_HEADER -128 63 64// Maximum size of a blob to transfer in-place. 65static const size_t IN_PLACE_BLOB_LIMIT = 40 * 1024; 66 67// XXX This can be made public if we want to provide 68// support for typed data. 69struct small_flat_data 70{ 71 uint32_t type; 72 uint32_t data; 73}; 74 75namespace android { 76 77void acquire_object(const sp<ProcessState>& proc, 78 const flat_binder_object& obj, const void* who) 79{ 80 switch (obj.type) { 81 case BINDER_TYPE_BINDER: 82 if (obj.binder) { 83 LOG_REFS("Parcel %p acquiring reference on local %p", who, obj.cookie); 84 reinterpret_cast<IBinder*>(obj.cookie)->incStrong(who); 85 } 86 return; 87 case BINDER_TYPE_WEAK_BINDER: 88 if (obj.binder) 89 reinterpret_cast<RefBase::weakref_type*>(obj.binder)->incWeak(who); 90 return; 91 case BINDER_TYPE_HANDLE: { 92 const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle); 93 if (b != NULL) { 94 LOG_REFS("Parcel %p acquiring reference on remote %p", who, b.get()); 95 b->incStrong(who); 96 } 97 return; 98 } 99 case BINDER_TYPE_WEAK_HANDLE: { 100 const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle); 101 if (b != NULL) b.get_refs()->incWeak(who); 102 return; 103 } 104 case BINDER_TYPE_FD: { 105 // intentionally blank -- nothing to do to acquire this, but we do 106 // recognize it as a legitimate object type. 107 return; 108 } 109 } 110 111 ALOGD("Invalid object type 0x%08x", obj.type); 112} 113 114void release_object(const sp<ProcessState>& proc, 115 const flat_binder_object& obj, const void* who) 116{ 117 switch (obj.type) { 118 case BINDER_TYPE_BINDER: 119 if (obj.binder) { 120 LOG_REFS("Parcel %p releasing reference on local %p", who, obj.cookie); 121 reinterpret_cast<IBinder*>(obj.cookie)->decStrong(who); 122 } 123 return; 124 case BINDER_TYPE_WEAK_BINDER: 125 if (obj.binder) 126 reinterpret_cast<RefBase::weakref_type*>(obj.binder)->decWeak(who); 127 return; 128 case BINDER_TYPE_HANDLE: { 129 const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle); 130 if (b != NULL) { 131 LOG_REFS("Parcel %p releasing reference on remote %p", who, b.get()); 132 b->decStrong(who); 133 } 134 return; 135 } 136 case BINDER_TYPE_WEAK_HANDLE: { 137 const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle); 138 if (b != NULL) b.get_refs()->decWeak(who); 139 return; 140 } 141 case BINDER_TYPE_FD: { 142 if (obj.cookie != 0) close(obj.handle); 143 return; 144 } 145 } 146 147 ALOGE("Invalid object type 0x%08x", obj.type); 148} 149 150inline static status_t finish_flatten_binder( 151 const sp<IBinder>& /*binder*/, const flat_binder_object& flat, Parcel* out) 152{ 153 return out->writeObject(flat, false); 154} 155 156status_t flatten_binder(const sp<ProcessState>& /*proc*/, 157 const sp<IBinder>& binder, Parcel* out) 158{ 159 flat_binder_object obj; 160 161 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 162 if (binder != NULL) { 163 IBinder *local = binder->localBinder(); 164 if (!local) { 165 BpBinder *proxy = binder->remoteBinder(); 166 if (proxy == NULL) { 167 ALOGE("null proxy"); 168 } 169 const int32_t handle = proxy ? proxy->handle() : 0; 170 obj.type = BINDER_TYPE_HANDLE; 171 obj.binder = 0; /* Don't pass uninitialized stack data to a remote process */ 172 obj.handle = handle; 173 obj.cookie = 0; 174 } else { 175 obj.type = BINDER_TYPE_BINDER; 176 obj.binder = reinterpret_cast<uintptr_t>(local->getWeakRefs()); 177 obj.cookie = reinterpret_cast<uintptr_t>(local); 178 } 179 } else { 180 obj.type = BINDER_TYPE_BINDER; 181 obj.binder = 0; 182 obj.cookie = 0; 183 } 184 185 return finish_flatten_binder(binder, obj, out); 186} 187 188status_t flatten_binder(const sp<ProcessState>& /*proc*/, 189 const wp<IBinder>& binder, Parcel* out) 190{ 191 flat_binder_object obj; 192 193 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 194 if (binder != NULL) { 195 sp<IBinder> real = binder.promote(); 196 if (real != NULL) { 197 IBinder *local = real->localBinder(); 198 if (!local) { 199 BpBinder *proxy = real->remoteBinder(); 200 if (proxy == NULL) { 201 ALOGE("null proxy"); 202 } 203 const int32_t handle = proxy ? proxy->handle() : 0; 204 obj.type = BINDER_TYPE_WEAK_HANDLE; 205 obj.binder = 0; /* Don't pass uninitialized stack data to a remote process */ 206 obj.handle = handle; 207 obj.cookie = 0; 208 } else { 209 obj.type = BINDER_TYPE_WEAK_BINDER; 210 obj.binder = reinterpret_cast<uintptr_t>(binder.get_refs()); 211 obj.cookie = reinterpret_cast<uintptr_t>(binder.unsafe_get()); 212 } 213 return finish_flatten_binder(real, obj, out); 214 } 215 216 // XXX How to deal? In order to flatten the given binder, 217 // we need to probe it for information, which requires a primary 218 // reference... but we don't have one. 219 // 220 // The OpenBinder implementation uses a dynamic_cast<> here, 221 // but we can't do that with the different reference counting 222 // implementation we are using. 223 ALOGE("Unable to unflatten Binder weak reference!"); 224 obj.type = BINDER_TYPE_BINDER; 225 obj.binder = 0; 226 obj.cookie = 0; 227 return finish_flatten_binder(NULL, obj, out); 228 229 } else { 230 obj.type = BINDER_TYPE_BINDER; 231 obj.binder = 0; 232 obj.cookie = 0; 233 return finish_flatten_binder(NULL, obj, out); 234 } 235} 236 237inline static status_t finish_unflatten_binder( 238 BpBinder* /*proxy*/, const flat_binder_object& /*flat*/, 239 const Parcel& /*in*/) 240{ 241 return NO_ERROR; 242} 243 244status_t unflatten_binder(const sp<ProcessState>& proc, 245 const Parcel& in, sp<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 = reinterpret_cast<IBinder*>(flat->cookie); 253 return finish_unflatten_binder(NULL, *flat, in); 254 case BINDER_TYPE_HANDLE: 255 *out = proc->getStrongProxyForHandle(flat->handle); 256 return finish_unflatten_binder( 257 static_cast<BpBinder*>(out->get()), *flat, in); 258 } 259 } 260 return BAD_TYPE; 261} 262 263status_t unflatten_binder(const sp<ProcessState>& proc, 264 const Parcel& in, wp<IBinder>* out) 265{ 266 const flat_binder_object* flat = in.readObject(false); 267 268 if (flat) { 269 switch (flat->type) { 270 case BINDER_TYPE_BINDER: 271 *out = reinterpret_cast<IBinder*>(flat->cookie); 272 return finish_unflatten_binder(NULL, *flat, in); 273 case BINDER_TYPE_WEAK_BINDER: 274 if (flat->binder != 0) { 275 out->set_object_and_refs( 276 reinterpret_cast<IBinder*>(flat->cookie), 277 reinterpret_cast<RefBase::weakref_type*>(flat->binder)); 278 } else { 279 *out = NULL; 280 } 281 return finish_unflatten_binder(NULL, *flat, in); 282 case BINDER_TYPE_HANDLE: 283 case BINDER_TYPE_WEAK_HANDLE: 284 *out = proc->getWeakProxyForHandle(flat->handle); 285 return finish_unflatten_binder( 286 static_cast<BpBinder*>(out->unsafe_get()), *flat, in); 287 } 288 } 289 return BAD_TYPE; 290} 291 292// --------------------------------------------------------------------------- 293 294Parcel::Parcel() 295{ 296 initState(); 297} 298 299Parcel::~Parcel() 300{ 301 freeDataNoInit(); 302} 303 304const uint8_t* Parcel::data() const 305{ 306 return mData; 307} 308 309size_t Parcel::dataSize() const 310{ 311 return (mDataSize > mDataPos ? mDataSize : mDataPos); 312} 313 314size_t Parcel::dataAvail() const 315{ 316 // TODO: decide what to do about the possibility that this can 317 // report an available-data size that exceeds a Java int's max 318 // positive value, causing havoc. Fortunately this will only 319 // happen if someone constructs a Parcel containing more than two 320 // gigabytes of data, which on typical phone hardware is simply 321 // not possible. 322 return dataSize() - dataPosition(); 323} 324 325size_t Parcel::dataPosition() const 326{ 327 return mDataPos; 328} 329 330size_t Parcel::dataCapacity() const 331{ 332 return mDataCapacity; 333} 334 335status_t Parcel::setDataSize(size_t size) 336{ 337 status_t err; 338 err = continueWrite(size); 339 if (err == NO_ERROR) { 340 mDataSize = size; 341 ALOGV("setDataSize Setting data size of %p to %zu", this, mDataSize); 342 } 343 return err; 344} 345 346void Parcel::setDataPosition(size_t pos) const 347{ 348 mDataPos = pos; 349 mNextObjectHint = 0; 350} 351 352status_t Parcel::setDataCapacity(size_t size) 353{ 354 if (size > mDataCapacity) return continueWrite(size); 355 return NO_ERROR; 356} 357 358status_t Parcel::setData(const uint8_t* buffer, size_t len) 359{ 360 status_t err = restartWrite(len); 361 if (err == NO_ERROR) { 362 memcpy(const_cast<uint8_t*>(data()), buffer, len); 363 mDataSize = len; 364 mFdsKnown = false; 365 } 366 return err; 367} 368 369status_t Parcel::appendFrom(const Parcel *parcel, size_t offset, size_t len) 370{ 371 const sp<ProcessState> proc(ProcessState::self()); 372 status_t err; 373 const uint8_t *data = parcel->mData; 374 const binder_size_t *objects = parcel->mObjects; 375 size_t size = parcel->mObjectsSize; 376 int startPos = mDataPos; 377 int firstIndex = -1, lastIndex = -2; 378 379 if (len == 0) { 380 return NO_ERROR; 381 } 382 383 // range checks against the source parcel size 384 if ((offset > parcel->mDataSize) 385 || (len > parcel->mDataSize) 386 || (offset + len > parcel->mDataSize)) { 387 return BAD_VALUE; 388 } 389 390 // Count objects in range 391 for (int i = 0; i < (int) size; i++) { 392 size_t off = objects[i]; 393 if ((off >= offset) && (off < offset + len)) { 394 if (firstIndex == -1) { 395 firstIndex = i; 396 } 397 lastIndex = i; 398 } 399 } 400 int numObjects = lastIndex - firstIndex + 1; 401 402 if ((mDataSize+len) > mDataCapacity) { 403 // grow data 404 err = growData(len); 405 if (err != NO_ERROR) { 406 return err; 407 } 408 } 409 410 // append data 411 memcpy(mData + mDataPos, data + offset, len); 412 mDataPos += len; 413 mDataSize += len; 414 415 err = NO_ERROR; 416 417 if (numObjects > 0) { 418 // grow objects 419 if (mObjectsCapacity < mObjectsSize + numObjects) { 420 int newSize = ((mObjectsSize + numObjects)*3)/2; 421 binder_size_t *objects = 422 (binder_size_t*)realloc(mObjects, newSize*sizeof(binder_size_t)); 423 if (objects == (binder_size_t*)0) { 424 return NO_MEMORY; 425 } 426 mObjects = objects; 427 mObjectsCapacity = newSize; 428 } 429 430 // append and acquire objects 431 int idx = mObjectsSize; 432 for (int i = firstIndex; i <= lastIndex; i++) { 433 size_t off = objects[i] - offset + startPos; 434 mObjects[idx++] = off; 435 mObjectsSize++; 436 437 flat_binder_object* flat 438 = reinterpret_cast<flat_binder_object*>(mData + off); 439 acquire_object(proc, *flat, this); 440 441 if (flat->type == BINDER_TYPE_FD) { 442 // If this is a file descriptor, we need to dup it so the 443 // new Parcel now owns its own fd, and can declare that we 444 // officially know we have fds. 445 flat->handle = dup(flat->handle); 446 flat->cookie = 1; 447 mHasFds = mFdsKnown = true; 448 if (!mAllowFds) { 449 err = FDS_NOT_ALLOWED; 450 } 451 } 452 } 453 } 454 455 return err; 456} 457 458bool Parcel::pushAllowFds(bool allowFds) 459{ 460 const bool origValue = mAllowFds; 461 if (!allowFds) { 462 mAllowFds = false; 463 } 464 return origValue; 465} 466 467void Parcel::restoreAllowFds(bool lastValue) 468{ 469 mAllowFds = lastValue; 470} 471 472bool Parcel::hasFileDescriptors() const 473{ 474 if (!mFdsKnown) { 475 scanForFds(); 476 } 477 return mHasFds; 478} 479 480// Write RPC headers. (previously just the interface token) 481status_t Parcel::writeInterfaceToken(const String16& interface) 482{ 483 writeInt32(IPCThreadState::self()->getStrictModePolicy() | 484 STRICT_MODE_PENALTY_GATHER); 485 // currently the interface identification token is just its name as a string 486 return writeString16(interface); 487} 488 489bool Parcel::checkInterface(IBinder* binder) const 490{ 491 return enforceInterface(binder->getInterfaceDescriptor()); 492} 493 494bool Parcel::enforceInterface(const String16& interface, 495 IPCThreadState* threadState) const 496{ 497 int32_t strictPolicy = readInt32(); 498 if (threadState == NULL) { 499 threadState = IPCThreadState::self(); 500 } 501 if ((threadState->getLastTransactionBinderFlags() & 502 IBinder::FLAG_ONEWAY) != 0) { 503 // For one-way calls, the callee is running entirely 504 // disconnected from the caller, so disable StrictMode entirely. 505 // Not only does disk/network usage not impact the caller, but 506 // there's no way to commuicate back any violations anyway. 507 threadState->setStrictModePolicy(0); 508 } else { 509 threadState->setStrictModePolicy(strictPolicy); 510 } 511 const String16 str(readString16()); 512 if (str == interface) { 513 return true; 514 } else { 515 ALOGW("**** enforceInterface() expected '%s' but read '%s'", 516 String8(interface).string(), String8(str).string()); 517 return false; 518 } 519} 520 521const binder_size_t* Parcel::objects() const 522{ 523 return mObjects; 524} 525 526size_t Parcel::objectsCount() const 527{ 528 return mObjectsSize; 529} 530 531status_t Parcel::errorCheck() const 532{ 533 return mError; 534} 535 536void Parcel::setError(status_t err) 537{ 538 mError = err; 539} 540 541status_t Parcel::finishWrite(size_t len) 542{ 543 //printf("Finish write of %d\n", len); 544 mDataPos += len; 545 ALOGV("finishWrite Setting data pos of %p to %zu", this, mDataPos); 546 if (mDataPos > mDataSize) { 547 mDataSize = mDataPos; 548 ALOGV("finishWrite Setting data size of %p to %zu", this, mDataSize); 549 } 550 //printf("New pos=%d, size=%d\n", mDataPos, mDataSize); 551 return NO_ERROR; 552} 553 554status_t Parcel::writeUnpadded(const void* data, size_t len) 555{ 556 size_t end = mDataPos + len; 557 if (end < mDataPos) { 558 // integer overflow 559 return BAD_VALUE; 560 } 561 562 if (end <= mDataCapacity) { 563restart_write: 564 memcpy(mData+mDataPos, data, len); 565 return finishWrite(len); 566 } 567 568 status_t err = growData(len); 569 if (err == NO_ERROR) goto restart_write; 570 return err; 571} 572 573status_t Parcel::write(const void* data, size_t len) 574{ 575 void* const d = writeInplace(len); 576 if (d) { 577 memcpy(d, data, len); 578 return NO_ERROR; 579 } 580 return mError; 581} 582 583void* Parcel::writeInplace(size_t len) 584{ 585 const size_t padded = PAD_SIZE(len); 586 587 // sanity check for integer overflow 588 if (mDataPos+padded < mDataPos) { 589 return NULL; 590 } 591 592 if ((mDataPos+padded) <= mDataCapacity) { 593restart_write: 594 //printf("Writing %ld bytes, padded to %ld\n", len, padded); 595 uint8_t* const data = mData+mDataPos; 596 597 // Need to pad at end? 598 if (padded != len) { 599#if BYTE_ORDER == BIG_ENDIAN 600 static const uint32_t mask[4] = { 601 0x00000000, 0xffffff00, 0xffff0000, 0xff000000 602 }; 603#endif 604#if BYTE_ORDER == LITTLE_ENDIAN 605 static const uint32_t mask[4] = { 606 0x00000000, 0x00ffffff, 0x0000ffff, 0x000000ff 607 }; 608#endif 609 //printf("Applying pad mask: %p to %p\n", (void*)mask[padded-len], 610 // *reinterpret_cast<void**>(data+padded-4)); 611 *reinterpret_cast<uint32_t*>(data+padded-4) &= mask[padded-len]; 612 } 613 614 finishWrite(padded); 615 return data; 616 } 617 618 status_t err = growData(padded); 619 if (err == NO_ERROR) goto restart_write; 620 return NULL; 621} 622 623status_t Parcel::writeInt32(int32_t val) 624{ 625 return writeAligned(val); 626} 627 628status_t Parcel::writeUint32(uint32_t val) 629{ 630 return writeAligned(val); 631} 632 633status_t Parcel::writeInt32Array(size_t len, const int32_t *val) { 634 if (!val) { 635 return writeAligned(-1); 636 } 637 status_t ret = writeAligned(len); 638 if (ret == NO_ERROR) { 639 ret = write(val, len * sizeof(*val)); 640 } 641 return ret; 642} 643status_t Parcel::writeByteArray(size_t len, const uint8_t *val) { 644 if (!val) { 645 return writeAligned(-1); 646 } 647 status_t ret = writeAligned(len); 648 if (ret == NO_ERROR) { 649 ret = write(val, len * sizeof(*val)); 650 } 651 return ret; 652} 653 654status_t Parcel::writeInt64(int64_t val) 655{ 656 return writeAligned(val); 657} 658 659status_t Parcel::writePointer(uintptr_t val) 660{ 661 return writeAligned<binder_uintptr_t>(val); 662} 663 664status_t Parcel::writeFloat(float val) 665{ 666 return writeAligned(val); 667} 668 669#if defined(__mips__) && defined(__mips_hard_float) 670 671status_t Parcel::writeDouble(double val) 672{ 673 union { 674 double d; 675 unsigned long long ll; 676 } u; 677 u.d = val; 678 return writeAligned(u.ll); 679} 680 681#else 682 683status_t Parcel::writeDouble(double val) 684{ 685 return writeAligned(val); 686} 687 688#endif 689 690status_t Parcel::writeCString(const char* str) 691{ 692 return write(str, strlen(str)+1); 693} 694 695status_t Parcel::writeString8(const String8& str) 696{ 697 status_t err = writeInt32(str.bytes()); 698 // only write string if its length is more than zero characters, 699 // as readString8 will only read if the length field is non-zero. 700 // this is slightly different from how writeString16 works. 701 if (str.bytes() > 0 && err == NO_ERROR) { 702 err = write(str.string(), str.bytes()+1); 703 } 704 return err; 705} 706 707status_t Parcel::writeString16(const String16& str) 708{ 709 return writeString16(str.string(), str.size()); 710} 711 712status_t Parcel::writeString16(const char16_t* str, size_t len) 713{ 714 if (str == NULL) return writeInt32(-1); 715 716 status_t err = writeInt32(len); 717 if (err == NO_ERROR) { 718 len *= sizeof(char16_t); 719 uint8_t* data = (uint8_t*)writeInplace(len+sizeof(char16_t)); 720 if (data) { 721 memcpy(data, str, len); 722 *reinterpret_cast<char16_t*>(data+len) = 0; 723 return NO_ERROR; 724 } 725 err = mError; 726 } 727 return err; 728} 729 730status_t Parcel::writeStrongBinder(const sp<IBinder>& val) 731{ 732 return flatten_binder(ProcessState::self(), val, this); 733} 734 735status_t Parcel::writeWeakBinder(const wp<IBinder>& val) 736{ 737 return flatten_binder(ProcessState::self(), val, this); 738} 739 740status_t Parcel::writeNativeHandle(const native_handle* handle) 741{ 742 if (!handle || handle->version != sizeof(native_handle)) 743 return BAD_TYPE; 744 745 status_t err; 746 err = writeInt32(handle->numFds); 747 if (err != NO_ERROR) return err; 748 749 err = writeInt32(handle->numInts); 750 if (err != NO_ERROR) return err; 751 752 for (int i=0 ; err==NO_ERROR && i<handle->numFds ; i++) 753 err = writeDupFileDescriptor(handle->data[i]); 754 755 if (err != NO_ERROR) { 756 ALOGD("write native handle, write dup fd failed"); 757 return err; 758 } 759 err = write(handle->data + handle->numFds, sizeof(int)*handle->numInts); 760 return err; 761} 762 763status_t Parcel::writeFileDescriptor(int fd, bool takeOwnership) 764{ 765 flat_binder_object obj; 766 obj.type = BINDER_TYPE_FD; 767 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 768 obj.binder = 0; /* Don't pass uninitialized stack data to a remote process */ 769 obj.handle = fd; 770 obj.cookie = takeOwnership ? 1 : 0; 771 return writeObject(obj, true); 772} 773 774status_t Parcel::writeDupFileDescriptor(int fd) 775{ 776 int dupFd = dup(fd); 777 778 { // Temporary extra debug validation for b/17477219: a Parcel recipient is 779 // getting a positive but invalid fd unexpectedly. Trying to track down 780 // where it's coming from. 781 int dupErrno = dupFd < 0 ? errno : 0; 782 int fdFlags = fcntl(fd, F_GETFD); 783 int fdFlagsErrno = fdFlags == -1 ? errno : 0; 784 int dupFlags = fcntl(dupFd, F_GETFD); 785 int dupFlagsErrno = dupFlags == -1 ? errno : 0; 786 if (dupFd < 0 || fdFlags == -1 || dupFlags == -1) { 787 ALOGE("Parcel::writeDupFileDescriptor failed:\n" 788 " fd=%d flags=%d err=%d(%s)\n" 789 " dupFd=%d dupErr=%d(%s) flags=%d err=%d(%s)", 790 fd, fdFlags, fdFlagsErrno, strerror(fdFlagsErrno), 791 dupFd, dupErrno, strerror(dupErrno), 792 dupFlags, dupFlagsErrno, strerror(dupFlagsErrno)); 793 if (fd < 0 || fdFlags == -1) { 794 CallStack(LOG_TAG); 795 } 796 return -errno; 797 } 798 } 799 800 if (dupFd < 0) { 801 return -errno; 802 } 803 status_t err = writeFileDescriptor(dupFd, true /*takeOwnership*/); 804 if (err) { 805 close(dupFd); 806 } 807 return err; 808} 809 810// WARNING: This method must stay in sync with 811// Parcelable.Creator<ParcelFileDescriptor> CREATOR 812// in frameworks/base/core/java/android/os/ParcelFileDescriptor.java 813status_t Parcel::writeParcelFileDescriptor(int fd, int commChannel) { 814 status_t status; 815 816 if (fd < 0) { 817 status = writeInt32(0); // ParcelFileDescriptor is null 818 if (status) return status; 819 } else { 820 status = writeInt32(1); // ParcelFileDescriptor is not null 821 if (status) return status; 822 status = writeDupFileDescriptor(fd); 823 if (status) return status; 824 if (commChannel < 0) { 825 status = writeInt32(0); // commChannel is null 826 if (status) return status; 827 } else { 828 status = writeInt32(1); // commChannel is not null 829 if (status) return status; 830 status = writeDupFileDescriptor(commChannel); 831 } 832 } 833 return status; 834} 835 836status_t Parcel::writeBlob(size_t len, WritableBlob* outBlob) 837{ 838 status_t status; 839 840 if (!mAllowFds || len <= IN_PLACE_BLOB_LIMIT) { 841 ALOGV("writeBlob: write in place"); 842 status = writeInt32(0); 843 if (status) return status; 844 845 void* ptr = writeInplace(len); 846 if (!ptr) return NO_MEMORY; 847 848 outBlob->init(false /*mapped*/, ptr, len); 849 return NO_ERROR; 850 } 851 852 ALOGV("writeBlob: write to ashmem"); 853 int fd = ashmem_create_region("Parcel Blob", len); 854 if (fd < 0) return NO_MEMORY; 855 856 int result = ashmem_set_prot_region(fd, PROT_READ | PROT_WRITE); 857 if (result < 0) { 858 status = result; 859 } else { 860 void* ptr = ::mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); 861 if (ptr == MAP_FAILED) { 862 status = -errno; 863 } else { 864 result = ashmem_set_prot_region(fd, PROT_READ); 865 if (result < 0) { 866 status = result; 867 } else { 868 status = writeInt32(1); 869 if (!status) { 870 status = writeFileDescriptor(fd, true /*takeOwnership*/); 871 if (!status) { 872 outBlob->init(true /*mapped*/, ptr, len); 873 return NO_ERROR; 874 } 875 } 876 } 877 } 878 ::munmap(ptr, len); 879 } 880 ::close(fd); 881 return status; 882} 883 884status_t Parcel::write(const FlattenableHelperInterface& val) 885{ 886 status_t err; 887 888 // size if needed 889 const size_t len = val.getFlattenedSize(); 890 const size_t fd_count = val.getFdCount(); 891 892 err = this->writeInt32(len); 893 if (err) return err; 894 895 err = this->writeInt32(fd_count); 896 if (err) return err; 897 898 // payload 899 void* const buf = this->writeInplace(PAD_SIZE(len)); 900 if (buf == NULL) 901 return BAD_VALUE; 902 903 int* fds = NULL; 904 if (fd_count) { 905 fds = new int[fd_count]; 906 } 907 908 err = val.flatten(buf, len, fds, fd_count); 909 for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) { 910 err = this->writeDupFileDescriptor( fds[i] ); 911 } 912 913 if (fd_count) { 914 delete [] fds; 915 } 916 917 return err; 918} 919 920status_t Parcel::writeObject(const flat_binder_object& val, bool nullMetaData) 921{ 922 const bool enoughData = (mDataPos+sizeof(val)) <= mDataCapacity; 923 const bool enoughObjects = mObjectsSize < mObjectsCapacity; 924 if (enoughData && enoughObjects) { 925restart_write: 926 *reinterpret_cast<flat_binder_object*>(mData+mDataPos) = val; 927 928 // Need to write meta-data? 929 if (nullMetaData || val.binder != 0) { 930 mObjects[mObjectsSize] = mDataPos; 931 acquire_object(ProcessState::self(), val, this); 932 mObjectsSize++; 933 } 934 935 // remember if it's a file descriptor 936 if (val.type == BINDER_TYPE_FD) { 937 if (!mAllowFds) { 938 return FDS_NOT_ALLOWED; 939 } 940 mHasFds = mFdsKnown = true; 941 } 942 943 return finishWrite(sizeof(flat_binder_object)); 944 } 945 946 if (!enoughData) { 947 const status_t err = growData(sizeof(val)); 948 if (err != NO_ERROR) return err; 949 } 950 if (!enoughObjects) { 951 size_t newSize = ((mObjectsSize+2)*3)/2; 952 binder_size_t* objects = (binder_size_t*)realloc(mObjects, newSize*sizeof(binder_size_t)); 953 if (objects == NULL) return NO_MEMORY; 954 mObjects = objects; 955 mObjectsCapacity = newSize; 956 } 957 958 goto restart_write; 959} 960 961status_t Parcel::writeNoException() 962{ 963 return writeInt32(0); 964} 965 966void Parcel::remove(size_t /*start*/, size_t /*amt*/) 967{ 968 LOG_ALWAYS_FATAL("Parcel::remove() not yet implemented!"); 969} 970 971status_t Parcel::read(void* outData, size_t len) const 972{ 973 if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize 974 && len <= PAD_SIZE(len)) { 975 memcpy(outData, mData+mDataPos, len); 976 mDataPos += PAD_SIZE(len); 977 ALOGV("read Setting data pos of %p to %zu", this, mDataPos); 978 return NO_ERROR; 979 } 980 return NOT_ENOUGH_DATA; 981} 982 983const void* Parcel::readInplace(size_t len) const 984{ 985 if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize 986 && len <= PAD_SIZE(len)) { 987 const void* data = mData+mDataPos; 988 mDataPos += PAD_SIZE(len); 989 ALOGV("readInplace Setting data pos of %p to %zu", this, mDataPos); 990 return data; 991 } 992 return NULL; 993} 994 995template<class T> 996status_t Parcel::readAligned(T *pArg) const { 997 COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T)); 998 999 if ((mDataPos+sizeof(T)) <= mDataSize) { 1000 const void* data = mData+mDataPos; 1001 mDataPos += sizeof(T); 1002 *pArg = *reinterpret_cast<const T*>(data); 1003 return NO_ERROR; 1004 } else { 1005 return NOT_ENOUGH_DATA; 1006 } 1007} 1008 1009template<class T> 1010T Parcel::readAligned() const { 1011 T result; 1012 if (readAligned(&result) != NO_ERROR) { 1013 result = 0; 1014 } 1015 1016 return result; 1017} 1018 1019template<class T> 1020status_t Parcel::writeAligned(T val) { 1021 COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T)); 1022 1023 if ((mDataPos+sizeof(val)) <= mDataCapacity) { 1024restart_write: 1025 *reinterpret_cast<T*>(mData+mDataPos) = val; 1026 return finishWrite(sizeof(val)); 1027 } 1028 1029 status_t err = growData(sizeof(val)); 1030 if (err == NO_ERROR) goto restart_write; 1031 return err; 1032} 1033 1034status_t Parcel::readInt32(int32_t *pArg) const 1035{ 1036 return readAligned(pArg); 1037} 1038 1039int32_t Parcel::readInt32() const 1040{ 1041 return readAligned<int32_t>(); 1042} 1043 1044status_t Parcel::readUint32(uint32_t *pArg) const 1045{ 1046 return readAligned(pArg); 1047} 1048 1049uint32_t Parcel::readUint32() const 1050{ 1051 return readAligned<uint32_t>(); 1052} 1053 1054status_t Parcel::readInt64(int64_t *pArg) const 1055{ 1056 return readAligned(pArg); 1057} 1058 1059 1060int64_t Parcel::readInt64() const 1061{ 1062 return readAligned<int64_t>(); 1063} 1064 1065status_t Parcel::readPointer(uintptr_t *pArg) const 1066{ 1067 status_t ret; 1068 binder_uintptr_t ptr; 1069 ret = readAligned(&ptr); 1070 if (!ret) 1071 *pArg = ptr; 1072 return ret; 1073} 1074 1075uintptr_t Parcel::readPointer() const 1076{ 1077 return readAligned<binder_uintptr_t>(); 1078} 1079 1080 1081status_t Parcel::readFloat(float *pArg) const 1082{ 1083 return readAligned(pArg); 1084} 1085 1086 1087float Parcel::readFloat() const 1088{ 1089 return readAligned<float>(); 1090} 1091 1092#if defined(__mips__) && defined(__mips_hard_float) 1093 1094status_t Parcel::readDouble(double *pArg) const 1095{ 1096 union { 1097 double d; 1098 unsigned long long ll; 1099 } u; 1100 u.d = 0; 1101 status_t status; 1102 status = readAligned(&u.ll); 1103 *pArg = u.d; 1104 return status; 1105} 1106 1107double Parcel::readDouble() const 1108{ 1109 union { 1110 double d; 1111 unsigned long long ll; 1112 } u; 1113 u.ll = readAligned<unsigned long long>(); 1114 return u.d; 1115} 1116 1117#else 1118 1119status_t Parcel::readDouble(double *pArg) const 1120{ 1121 return readAligned(pArg); 1122} 1123 1124double Parcel::readDouble() const 1125{ 1126 return readAligned<double>(); 1127} 1128 1129#endif 1130 1131status_t Parcel::readIntPtr(intptr_t *pArg) const 1132{ 1133 return readAligned(pArg); 1134} 1135 1136 1137intptr_t Parcel::readIntPtr() const 1138{ 1139 return readAligned<intptr_t>(); 1140} 1141 1142 1143const char* Parcel::readCString() const 1144{ 1145 const size_t avail = mDataSize-mDataPos; 1146 if (avail > 0) { 1147 const char* str = reinterpret_cast<const char*>(mData+mDataPos); 1148 // is the string's trailing NUL within the parcel's valid bounds? 1149 const char* eos = reinterpret_cast<const char*>(memchr(str, 0, avail)); 1150 if (eos) { 1151 const size_t len = eos - str; 1152 mDataPos += PAD_SIZE(len+1); 1153 ALOGV("readCString Setting data pos of %p to %zu", this, mDataPos); 1154 return str; 1155 } 1156 } 1157 return NULL; 1158} 1159 1160String8 Parcel::readString8() const 1161{ 1162 int32_t size = readInt32(); 1163 // watch for potential int overflow adding 1 for trailing NUL 1164 if (size > 0 && size < INT32_MAX) { 1165 const char* str = (const char*)readInplace(size+1); 1166 if (str) return String8(str, size); 1167 } 1168 return String8(); 1169} 1170 1171String16 Parcel::readString16() const 1172{ 1173 size_t len; 1174 const char16_t* str = readString16Inplace(&len); 1175 if (str) return String16(str, len); 1176 ALOGE("Reading a NULL string not supported here."); 1177 return String16(); 1178} 1179 1180const char16_t* Parcel::readString16Inplace(size_t* outLen) const 1181{ 1182 int32_t size = readInt32(); 1183 // watch for potential int overflow from size+1 1184 if (size >= 0 && size < INT32_MAX) { 1185 *outLen = size; 1186 const char16_t* str = (const char16_t*)readInplace((size+1)*sizeof(char16_t)); 1187 if (str != NULL) { 1188 return str; 1189 } 1190 } 1191 *outLen = 0; 1192 return NULL; 1193} 1194 1195sp<IBinder> Parcel::readStrongBinder() const 1196{ 1197 sp<IBinder> val; 1198 unflatten_binder(ProcessState::self(), *this, &val); 1199 return val; 1200} 1201 1202wp<IBinder> Parcel::readWeakBinder() const 1203{ 1204 wp<IBinder> val; 1205 unflatten_binder(ProcessState::self(), *this, &val); 1206 return val; 1207} 1208 1209int32_t Parcel::readExceptionCode() const 1210{ 1211 int32_t exception_code = readAligned<int32_t>(); 1212 if (exception_code == EX_HAS_REPLY_HEADER) { 1213 int32_t header_start = dataPosition(); 1214 int32_t header_size = readAligned<int32_t>(); 1215 // Skip over fat responses headers. Not used (or propagated) in 1216 // native code 1217 setDataPosition(header_start + header_size); 1218 // And fat response headers are currently only used when there are no 1219 // exceptions, so return no error: 1220 return 0; 1221 } 1222 return exception_code; 1223} 1224 1225native_handle* Parcel::readNativeHandle() const 1226{ 1227 int numFds, numInts; 1228 status_t err; 1229 err = readInt32(&numFds); 1230 if (err != NO_ERROR) return 0; 1231 err = readInt32(&numInts); 1232 if (err != NO_ERROR) return 0; 1233 1234 native_handle* h = native_handle_create(numFds, numInts); 1235 for (int i=0 ; err==NO_ERROR && i<numFds ; i++) { 1236 h->data[i] = dup(readFileDescriptor()); 1237 if (h->data[i] < 0) err = BAD_VALUE; 1238 } 1239 err = read(h->data + numFds, sizeof(int)*numInts); 1240 if (err != NO_ERROR) { 1241 native_handle_close(h); 1242 native_handle_delete(h); 1243 h = 0; 1244 } 1245 return h; 1246} 1247 1248 1249int Parcel::readFileDescriptor() const 1250{ 1251 const flat_binder_object* flat = readObject(true); 1252 if (flat) { 1253 switch (flat->type) { 1254 case BINDER_TYPE_FD: 1255 //ALOGI("Returning file descriptor %ld from parcel %p", flat->handle, this); 1256 return flat->handle; 1257 } 1258 } 1259 return BAD_TYPE; 1260} 1261 1262// WARNING: This method must stay in sync with writeToParcel() 1263// in frameworks/base/core/java/android/os/ParcelFileDescriptor.java 1264int Parcel::readParcelFileDescriptor(int& outCommChannel) const { 1265 int fd; 1266 outCommChannel = -1; 1267 1268 if (readInt32() == 0) { 1269 fd = -1; 1270 } else { 1271 fd = readFileDescriptor(); 1272 if (fd >= 0 && readInt32() != 0) { 1273 outCommChannel = readFileDescriptor(); 1274 } 1275 } 1276 return fd; 1277} 1278 1279status_t Parcel::readBlob(size_t len, ReadableBlob* outBlob) const 1280{ 1281 int32_t useAshmem; 1282 status_t status = readInt32(&useAshmem); 1283 if (status) return status; 1284 1285 if (!useAshmem) { 1286 ALOGV("readBlob: read in place"); 1287 const void* ptr = readInplace(len); 1288 if (!ptr) return BAD_VALUE; 1289 1290 outBlob->init(false /*mapped*/, const_cast<void*>(ptr), len); 1291 return NO_ERROR; 1292 } 1293 1294 ALOGV("readBlob: read from ashmem"); 1295 int fd = readFileDescriptor(); 1296 if (fd == int(BAD_TYPE)) return BAD_VALUE; 1297 1298 void* ptr = ::mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0); 1299 if (ptr == MAP_FAILED) return NO_MEMORY; 1300 1301 outBlob->init(true /*mapped*/, ptr, len); 1302 return NO_ERROR; 1303} 1304 1305status_t Parcel::read(FlattenableHelperInterface& val) const 1306{ 1307 // size 1308 const size_t len = this->readInt32(); 1309 const size_t fd_count = this->readInt32(); 1310 1311 // payload 1312 void const* const buf = this->readInplace(PAD_SIZE(len)); 1313 if (buf == NULL) 1314 return BAD_VALUE; 1315 1316 int* fds = NULL; 1317 if (fd_count) { 1318 fds = new int[fd_count]; 1319 } 1320 1321 status_t err = NO_ERROR; 1322 for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) { 1323 int oldfd = this->readFileDescriptor(); 1324 fds[i] = dup(oldfd); 1325 if (fds[i] < 0) { 1326 int dupErrno = errno; 1327 err = BAD_VALUE; 1328 int flags = fcntl(oldfd, F_GETFD); 1329 int fcntlErrno = errno; 1330 const flat_binder_object* flat = readObject(true); 1331 ALOGE("dup failed in Parcel::read, fd %zu of %zu\n" 1332 " dup(%d) = %d [errno: %d (%s)]\n" 1333 " fcntl(%d, F_GETFD) = %d [errno: %d (%s)]\n" 1334 " flat %p type %d", 1335 i, fd_count, 1336 oldfd, fds[i], dupErrno, strerror(dupErrno), 1337 oldfd, flags, fcntlErrno, strerror(fcntlErrno), 1338 flat, flat ? flat->type : 0); 1339 CallStack(LOG_TAG); 1340 } 1341 } 1342 1343 if (err == NO_ERROR) { 1344 err = val.unflatten(buf, len, fds, fd_count); 1345 } 1346 1347 if (fd_count) { 1348 delete [] fds; 1349 } 1350 1351 return err; 1352} 1353const flat_binder_object* Parcel::readObject(bool nullMetaData) const 1354{ 1355 const size_t DPOS = mDataPos; 1356 if ((DPOS+sizeof(flat_binder_object)) <= mDataSize) { 1357 const flat_binder_object* obj 1358 = reinterpret_cast<const flat_binder_object*>(mData+DPOS); 1359 mDataPos = DPOS + sizeof(flat_binder_object); 1360 if (!nullMetaData && (obj->cookie == 0 && obj->binder == 0)) { 1361 // When transferring a NULL object, we don't write it into 1362 // the object list, so we don't want to check for it when 1363 // reading. 1364 ALOGV("readObject Setting data pos of %p to %zu", this, mDataPos); 1365 return obj; 1366 } 1367 1368 // Ensure that this object is valid... 1369 binder_size_t* const OBJS = mObjects; 1370 const size_t N = mObjectsSize; 1371 size_t opos = mNextObjectHint; 1372 1373 if (N > 0) { 1374 ALOGV("Parcel %p looking for obj at %zu, hint=%zu", 1375 this, DPOS, opos); 1376 1377 // Start at the current hint position, looking for an object at 1378 // the current data position. 1379 if (opos < N) { 1380 while (opos < (N-1) && OBJS[opos] < DPOS) { 1381 opos++; 1382 } 1383 } else { 1384 opos = N-1; 1385 } 1386 if (OBJS[opos] == DPOS) { 1387 // Found it! 1388 ALOGV("Parcel %p found obj %zu at index %zu with forward search", 1389 this, DPOS, opos); 1390 mNextObjectHint = opos+1; 1391 ALOGV("readObject Setting data pos of %p to %zu", this, mDataPos); 1392 return obj; 1393 } 1394 1395 // Look backwards for it... 1396 while (opos > 0 && OBJS[opos] > DPOS) { 1397 opos--; 1398 } 1399 if (OBJS[opos] == DPOS) { 1400 // Found it! 1401 ALOGV("Parcel %p found obj %zu at index %zu with backward search", 1402 this, DPOS, opos); 1403 mNextObjectHint = opos+1; 1404 ALOGV("readObject Setting data pos of %p to %zu", this, mDataPos); 1405 return obj; 1406 } 1407 } 1408 ALOGW("Attempt to read object from Parcel %p at offset %zu that is not in the object list", 1409 this, DPOS); 1410 } 1411 return NULL; 1412} 1413 1414void Parcel::closeFileDescriptors() 1415{ 1416 size_t i = mObjectsSize; 1417 if (i > 0) { 1418 //ALOGI("Closing file descriptors for %zu objects...", i); 1419 } 1420 while (i > 0) { 1421 i--; 1422 const flat_binder_object* flat 1423 = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]); 1424 if (flat->type == BINDER_TYPE_FD) { 1425 //ALOGI("Closing fd: %ld", flat->handle); 1426 close(flat->handle); 1427 } 1428 } 1429} 1430 1431uintptr_t Parcel::ipcData() const 1432{ 1433 return reinterpret_cast<uintptr_t>(mData); 1434} 1435 1436size_t Parcel::ipcDataSize() const 1437{ 1438 return (mDataSize > mDataPos ? mDataSize : mDataPos); 1439} 1440 1441uintptr_t Parcel::ipcObjects() const 1442{ 1443 return reinterpret_cast<uintptr_t>(mObjects); 1444} 1445 1446size_t Parcel::ipcObjectsCount() const 1447{ 1448 return mObjectsSize; 1449} 1450 1451void Parcel::ipcSetDataReference(const uint8_t* data, size_t dataSize, 1452 const binder_size_t* objects, size_t objectsCount, release_func relFunc, void* relCookie) 1453{ 1454 binder_size_t minOffset = 0; 1455 freeDataNoInit(); 1456 mError = NO_ERROR; 1457 mData = const_cast<uint8_t*>(data); 1458 mDataSize = mDataCapacity = dataSize; 1459 //ALOGI("setDataReference Setting data size of %p to %lu (pid=%d)", this, mDataSize, getpid()); 1460 mDataPos = 0; 1461 ALOGV("setDataReference Setting data pos of %p to %zu", this, mDataPos); 1462 mObjects = const_cast<binder_size_t*>(objects); 1463 mObjectsSize = mObjectsCapacity = objectsCount; 1464 mNextObjectHint = 0; 1465 mOwner = relFunc; 1466 mOwnerCookie = relCookie; 1467 for (size_t i = 0; i < mObjectsSize; i++) { 1468 binder_size_t offset = mObjects[i]; 1469 if (offset < minOffset) { 1470 ALOGE("%s: bad object offset %" PRIu64 " < %" PRIu64 "\n", 1471 __func__, (uint64_t)offset, (uint64_t)minOffset); 1472 mObjectsSize = 0; 1473 break; 1474 } 1475 minOffset = offset + sizeof(flat_binder_object); 1476 } 1477 scanForFds(); 1478} 1479 1480void Parcel::print(TextOutput& to, uint32_t /*flags*/) const 1481{ 1482 to << "Parcel("; 1483 1484 if (errorCheck() != NO_ERROR) { 1485 const status_t err = errorCheck(); 1486 to << "Error: " << (void*)(intptr_t)err << " \"" << strerror(-err) << "\""; 1487 } else if (dataSize() > 0) { 1488 const uint8_t* DATA = data(); 1489 to << indent << HexDump(DATA, dataSize()) << dedent; 1490 const binder_size_t* OBJS = objects(); 1491 const size_t N = objectsCount(); 1492 for (size_t i=0; i<N; i++) { 1493 const flat_binder_object* flat 1494 = reinterpret_cast<const flat_binder_object*>(DATA+OBJS[i]); 1495 to << endl << "Object #" << i << " @ " << (void*)OBJS[i] << ": " 1496 << TypeCode(flat->type & 0x7f7f7f00) 1497 << " = " << flat->binder; 1498 } 1499 } else { 1500 to << "NULL"; 1501 } 1502 1503 to << ")"; 1504} 1505 1506void Parcel::releaseObjects() 1507{ 1508 const sp<ProcessState> proc(ProcessState::self()); 1509 size_t i = mObjectsSize; 1510 uint8_t* const data = mData; 1511 binder_size_t* const objects = mObjects; 1512 while (i > 0) { 1513 i--; 1514 const flat_binder_object* flat 1515 = reinterpret_cast<flat_binder_object*>(data+objects[i]); 1516 release_object(proc, *flat, this); 1517 } 1518} 1519 1520void Parcel::acquireObjects() 1521{ 1522 const sp<ProcessState> proc(ProcessState::self()); 1523 size_t i = mObjectsSize; 1524 uint8_t* const data = mData; 1525 binder_size_t* const objects = mObjects; 1526 while (i > 0) { 1527 i--; 1528 const flat_binder_object* flat 1529 = reinterpret_cast<flat_binder_object*>(data+objects[i]); 1530 acquire_object(proc, *flat, this); 1531 } 1532} 1533 1534void Parcel::freeData() 1535{ 1536 freeDataNoInit(); 1537 initState(); 1538} 1539 1540void Parcel::freeDataNoInit() 1541{ 1542 if (mOwner) { 1543 //ALOGI("Freeing data ref of %p (pid=%d)", this, getpid()); 1544 mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie); 1545 } else { 1546 releaseObjects(); 1547 if (mData) free(mData); 1548 if (mObjects) free(mObjects); 1549 } 1550} 1551 1552status_t Parcel::growData(size_t len) 1553{ 1554 size_t newSize = ((mDataSize+len)*3)/2; 1555 return (newSize <= mDataSize) 1556 ? (status_t) NO_MEMORY 1557 : continueWrite(newSize); 1558} 1559 1560status_t Parcel::restartWrite(size_t desired) 1561{ 1562 if (mOwner) { 1563 freeData(); 1564 return continueWrite(desired); 1565 } 1566 1567 uint8_t* data = (uint8_t*)realloc(mData, desired); 1568 if (!data && desired > mDataCapacity) { 1569 mError = NO_MEMORY; 1570 return NO_MEMORY; 1571 } 1572 1573 releaseObjects(); 1574 1575 if (data) { 1576 mData = data; 1577 mDataCapacity = desired; 1578 } 1579 1580 mDataSize = mDataPos = 0; 1581 ALOGV("restartWrite Setting data size of %p to %zu", this, mDataSize); 1582 ALOGV("restartWrite Setting data pos of %p to %zu", this, mDataPos); 1583 1584 free(mObjects); 1585 mObjects = NULL; 1586 mObjectsSize = mObjectsCapacity = 0; 1587 mNextObjectHint = 0; 1588 mHasFds = false; 1589 mFdsKnown = true; 1590 mAllowFds = true; 1591 1592 return NO_ERROR; 1593} 1594 1595status_t Parcel::continueWrite(size_t desired) 1596{ 1597 // If shrinking, first adjust for any objects that appear 1598 // after the new data size. 1599 size_t objectsSize = mObjectsSize; 1600 if (desired < mDataSize) { 1601 if (desired == 0) { 1602 objectsSize = 0; 1603 } else { 1604 while (objectsSize > 0) { 1605 if (mObjects[objectsSize-1] < desired) 1606 break; 1607 objectsSize--; 1608 } 1609 } 1610 } 1611 1612 if (mOwner) { 1613 // If the size is going to zero, just release the owner's data. 1614 if (desired == 0) { 1615 freeData(); 1616 return NO_ERROR; 1617 } 1618 1619 // If there is a different owner, we need to take 1620 // posession. 1621 uint8_t* data = (uint8_t*)malloc(desired); 1622 if (!data) { 1623 mError = NO_MEMORY; 1624 return NO_MEMORY; 1625 } 1626 binder_size_t* objects = NULL; 1627 1628 if (objectsSize) { 1629 objects = (binder_size_t*)malloc(objectsSize*sizeof(binder_size_t)); 1630 if (!objects) { 1631 free(data); 1632 1633 mError = NO_MEMORY; 1634 return NO_MEMORY; 1635 } 1636 1637 // Little hack to only acquire references on objects 1638 // we will be keeping. 1639 size_t oldObjectsSize = mObjectsSize; 1640 mObjectsSize = objectsSize; 1641 acquireObjects(); 1642 mObjectsSize = oldObjectsSize; 1643 } 1644 1645 if (mData) { 1646 memcpy(data, mData, mDataSize < desired ? mDataSize : desired); 1647 } 1648 if (objects && mObjects) { 1649 memcpy(objects, mObjects, objectsSize*sizeof(binder_size_t)); 1650 } 1651 //ALOGI("Freeing data ref of %p (pid=%d)", this, getpid()); 1652 mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie); 1653 mOwner = NULL; 1654 1655 mData = data; 1656 mObjects = objects; 1657 mDataSize = (mDataSize < desired) ? mDataSize : desired; 1658 ALOGV("continueWrite Setting data size of %p to %zu", this, mDataSize); 1659 mDataCapacity = desired; 1660 mObjectsSize = mObjectsCapacity = objectsSize; 1661 mNextObjectHint = 0; 1662 1663 } else if (mData) { 1664 if (objectsSize < mObjectsSize) { 1665 // Need to release refs on any objects we are dropping. 1666 const sp<ProcessState> proc(ProcessState::self()); 1667 for (size_t i=objectsSize; i<mObjectsSize; i++) { 1668 const flat_binder_object* flat 1669 = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]); 1670 if (flat->type == BINDER_TYPE_FD) { 1671 // will need to rescan because we may have lopped off the only FDs 1672 mFdsKnown = false; 1673 } 1674 release_object(proc, *flat, this); 1675 } 1676 binder_size_t* objects = 1677 (binder_size_t*)realloc(mObjects, objectsSize*sizeof(binder_size_t)); 1678 if (objects) { 1679 mObjects = objects; 1680 } 1681 mObjectsSize = objectsSize; 1682 mNextObjectHint = 0; 1683 } 1684 1685 // We own the data, so we can just do a realloc(). 1686 if (desired > mDataCapacity) { 1687 uint8_t* data = (uint8_t*)realloc(mData, desired); 1688 if (data) { 1689 mData = data; 1690 mDataCapacity = desired; 1691 } else if (desired > mDataCapacity) { 1692 mError = NO_MEMORY; 1693 return NO_MEMORY; 1694 } 1695 } else { 1696 if (mDataSize > desired) { 1697 mDataSize = desired; 1698 ALOGV("continueWrite Setting data size of %p to %zu", this, mDataSize); 1699 } 1700 if (mDataPos > desired) { 1701 mDataPos = desired; 1702 ALOGV("continueWrite Setting data pos of %p to %zu", this, mDataPos); 1703 } 1704 } 1705 1706 } else { 1707 // This is the first data. Easy! 1708 uint8_t* data = (uint8_t*)malloc(desired); 1709 if (!data) { 1710 mError = NO_MEMORY; 1711 return NO_MEMORY; 1712 } 1713 1714 if(!(mDataCapacity == 0 && mObjects == NULL 1715 && mObjectsCapacity == 0)) { 1716 ALOGE("continueWrite: %zu/%p/%zu/%zu", mDataCapacity, mObjects, mObjectsCapacity, desired); 1717 } 1718 1719 mData = data; 1720 mDataSize = mDataPos = 0; 1721 ALOGV("continueWrite Setting data size of %p to %zu", this, mDataSize); 1722 ALOGV("continueWrite Setting data pos of %p to %zu", this, mDataPos); 1723 mDataCapacity = desired; 1724 } 1725 1726 return NO_ERROR; 1727} 1728 1729void Parcel::initState() 1730{ 1731 mError = NO_ERROR; 1732 mData = 0; 1733 mDataSize = 0; 1734 mDataCapacity = 0; 1735 mDataPos = 0; 1736 ALOGV("initState Setting data size of %p to %zu", this, mDataSize); 1737 ALOGV("initState Setting data pos of %p to %zu", this, mDataPos); 1738 mObjects = NULL; 1739 mObjectsSize = 0; 1740 mObjectsCapacity = 0; 1741 mNextObjectHint = 0; 1742 mHasFds = false; 1743 mFdsKnown = true; 1744 mAllowFds = true; 1745 mOwner = NULL; 1746} 1747 1748void Parcel::scanForFds() const 1749{ 1750 bool hasFds = false; 1751 for (size_t i=0; i<mObjectsSize; i++) { 1752 const flat_binder_object* flat 1753 = reinterpret_cast<const flat_binder_object*>(mData + mObjects[i]); 1754 if (flat->type == BINDER_TYPE_FD) { 1755 hasFds = true; 1756 break; 1757 } 1758 } 1759 mHasFds = hasFds; 1760 mFdsKnown = true; 1761} 1762 1763// --- Parcel::Blob --- 1764 1765Parcel::Blob::Blob() : 1766 mMapped(false), mData(NULL), mSize(0) { 1767} 1768 1769Parcel::Blob::~Blob() { 1770 release(); 1771} 1772 1773void Parcel::Blob::release() { 1774 if (mMapped && mData) { 1775 ::munmap(mData, mSize); 1776 } 1777 clear(); 1778} 1779 1780void Parcel::Blob::init(bool mapped, void* data, size_t size) { 1781 mMapped = mapped; 1782 mData = data; 1783 mSize = size; 1784} 1785 1786void Parcel::Blob::clear() { 1787 mMapped = false; 1788 mData = NULL; 1789 mSize = 0; 1790} 1791 1792}; // namespace android 1793