Parcel.cpp revision 499127eab812088ca24421b59ebfac6f47ea850f
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/Debug.h> 30#include <utils/Log.h> 31#include <utils/String8.h> 32#include <utils/String16.h> 33#include <utils/misc.h> 34#include <utils/Flattenable.h> 35#include <cutils/ashmem.h> 36 37#include <private/binder/binder_module.h> 38#include <private/binder/Static.h> 39 40#include <inttypes.h> 41#include <stdio.h> 42#include <stdlib.h> 43#include <stdint.h> 44#include <sys/mman.h> 45 46#ifndef INT32_MAX 47#define INT32_MAX ((int32_t)(2147483647)) 48#endif 49 50#define LOG_REFS(...) 51//#define LOG_REFS(...) ALOG(LOG_DEBUG, "Parcel", __VA_ARGS__) 52#define LOG_ALLOC(...) 53//#define LOG_ALLOC(...) ALOG(LOG_DEBUG, "Parcel", __VA_ARGS__) 54 55// --------------------------------------------------------------------------- 56 57#define PAD_SIZE(s) (((s)+3)&~3) 58 59// Note: must be kept in sync with android/os/StrictMode.java's PENALTY_GATHER 60#define STRICT_MODE_PENALTY_GATHER (0x40 << 16) 61 62// Note: must be kept in sync with android/os/Parcel.java's EX_HAS_REPLY_HEADER 63#define EX_HAS_REPLY_HEADER -128 64 65// Maximum size of a blob to transfer in-place. 66static const size_t IN_PLACE_BLOB_LIMIT = 40 * 1024; 67 68// XXX This can be made public if we want to provide 69// support for typed data. 70struct small_flat_data 71{ 72 uint32_t type; 73 uint32_t data; 74}; 75 76namespace android { 77 78static pthread_mutex_t gParcelGlobalAllocSizeLock = PTHREAD_MUTEX_INITIALIZER; 79static size_t gParcelGlobalAllocSize = 0; 80static size_t gParcelGlobalAllocCount = 0; 81 82void acquire_object(const sp<ProcessState>& proc, 83 const flat_binder_object& obj, const void* who) 84{ 85 switch (obj.type) { 86 case BINDER_TYPE_BINDER: 87 if (obj.binder) { 88 LOG_REFS("Parcel %p acquiring reference on local %p", who, obj.cookie); 89 reinterpret_cast<IBinder*>(obj.cookie)->incStrong(who); 90 } 91 return; 92 case BINDER_TYPE_WEAK_BINDER: 93 if (obj.binder) 94 reinterpret_cast<RefBase::weakref_type*>(obj.binder)->incWeak(who); 95 return; 96 case BINDER_TYPE_HANDLE: { 97 const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle); 98 if (b != NULL) { 99 LOG_REFS("Parcel %p acquiring reference on remote %p", who, b.get()); 100 b->incStrong(who); 101 } 102 return; 103 } 104 case BINDER_TYPE_WEAK_HANDLE: { 105 const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle); 106 if (b != NULL) b.get_refs()->incWeak(who); 107 return; 108 } 109 case BINDER_TYPE_FD: { 110 // intentionally blank -- nothing to do to acquire this, but we do 111 // recognize it as a legitimate object type. 112 return; 113 } 114 } 115 116 ALOGD("Invalid object type 0x%08x", obj.type); 117} 118 119void release_object(const sp<ProcessState>& proc, 120 const flat_binder_object& obj, const void* who) 121{ 122 switch (obj.type) { 123 case BINDER_TYPE_BINDER: 124 if (obj.binder) { 125 LOG_REFS("Parcel %p releasing reference on local %p", who, obj.cookie); 126 reinterpret_cast<IBinder*>(obj.cookie)->decStrong(who); 127 } 128 return; 129 case BINDER_TYPE_WEAK_BINDER: 130 if (obj.binder) 131 reinterpret_cast<RefBase::weakref_type*>(obj.binder)->decWeak(who); 132 return; 133 case BINDER_TYPE_HANDLE: { 134 const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle); 135 if (b != NULL) { 136 LOG_REFS("Parcel %p releasing reference on remote %p", who, b.get()); 137 b->decStrong(who); 138 } 139 return; 140 } 141 case BINDER_TYPE_WEAK_HANDLE: { 142 const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle); 143 if (b != NULL) b.get_refs()->decWeak(who); 144 return; 145 } 146 case BINDER_TYPE_FD: { 147 if (obj.cookie != 0) close(obj.handle); 148 return; 149 } 150 } 151 152 ALOGE("Invalid object type 0x%08x", obj.type); 153} 154 155inline static status_t finish_flatten_binder( 156 const sp<IBinder>& /*binder*/, const flat_binder_object& flat, Parcel* out) 157{ 158 return out->writeObject(flat, false); 159} 160 161status_t flatten_binder(const sp<ProcessState>& /*proc*/, 162 const sp<IBinder>& binder, Parcel* out) 163{ 164 flat_binder_object obj; 165 166 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 167 if (binder != NULL) { 168 IBinder *local = binder->localBinder(); 169 if (!local) { 170 BpBinder *proxy = binder->remoteBinder(); 171 if (proxy == NULL) { 172 ALOGE("null proxy"); 173 } 174 const int32_t handle = proxy ? proxy->handle() : 0; 175 obj.type = BINDER_TYPE_HANDLE; 176 obj.binder = 0; /* Don't pass uninitialized stack data to a remote process */ 177 obj.handle = handle; 178 obj.cookie = 0; 179 } else { 180 obj.type = BINDER_TYPE_BINDER; 181 obj.binder = reinterpret_cast<uintptr_t>(local->getWeakRefs()); 182 obj.cookie = reinterpret_cast<uintptr_t>(local); 183 } 184 } else { 185 obj.type = BINDER_TYPE_BINDER; 186 obj.binder = 0; 187 obj.cookie = 0; 188 } 189 190 return finish_flatten_binder(binder, obj, out); 191} 192 193status_t flatten_binder(const sp<ProcessState>& /*proc*/, 194 const wp<IBinder>& binder, Parcel* out) 195{ 196 flat_binder_object obj; 197 198 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 199 if (binder != NULL) { 200 sp<IBinder> real = binder.promote(); 201 if (real != NULL) { 202 IBinder *local = real->localBinder(); 203 if (!local) { 204 BpBinder *proxy = real->remoteBinder(); 205 if (proxy == NULL) { 206 ALOGE("null proxy"); 207 } 208 const int32_t handle = proxy ? proxy->handle() : 0; 209 obj.type = BINDER_TYPE_WEAK_HANDLE; 210 obj.binder = 0; /* Don't pass uninitialized stack data to a remote process */ 211 obj.handle = handle; 212 obj.cookie = 0; 213 } else { 214 obj.type = BINDER_TYPE_WEAK_BINDER; 215 obj.binder = reinterpret_cast<uintptr_t>(binder.get_refs()); 216 obj.cookie = reinterpret_cast<uintptr_t>(binder.unsafe_get()); 217 } 218 return finish_flatten_binder(real, obj, out); 219 } 220 221 // XXX How to deal? In order to flatten the given binder, 222 // we need to probe it for information, which requires a primary 223 // reference... but we don't have one. 224 // 225 // The OpenBinder implementation uses a dynamic_cast<> here, 226 // but we can't do that with the different reference counting 227 // implementation we are using. 228 ALOGE("Unable to unflatten Binder weak reference!"); 229 obj.type = BINDER_TYPE_BINDER; 230 obj.binder = 0; 231 obj.cookie = 0; 232 return finish_flatten_binder(NULL, obj, out); 233 234 } else { 235 obj.type = BINDER_TYPE_BINDER; 236 obj.binder = 0; 237 obj.cookie = 0; 238 return finish_flatten_binder(NULL, obj, out); 239 } 240} 241 242inline static status_t finish_unflatten_binder( 243 BpBinder* /*proxy*/, const flat_binder_object& /*flat*/, 244 const Parcel& /*in*/) 245{ 246 return NO_ERROR; 247} 248 249status_t unflatten_binder(const sp<ProcessState>& proc, 250 const Parcel& in, sp<IBinder>* out) 251{ 252 const flat_binder_object* flat = in.readObject(false); 253 254 if (flat) { 255 switch (flat->type) { 256 case BINDER_TYPE_BINDER: 257 *out = reinterpret_cast<IBinder*>(flat->cookie); 258 return finish_unflatten_binder(NULL, *flat, in); 259 case BINDER_TYPE_HANDLE: 260 *out = proc->getStrongProxyForHandle(flat->handle); 261 return finish_unflatten_binder( 262 static_cast<BpBinder*>(out->get()), *flat, in); 263 } 264 } 265 return BAD_TYPE; 266} 267 268status_t unflatten_binder(const sp<ProcessState>& proc, 269 const Parcel& in, wp<IBinder>* out) 270{ 271 const flat_binder_object* flat = in.readObject(false); 272 273 if (flat) { 274 switch (flat->type) { 275 case BINDER_TYPE_BINDER: 276 *out = reinterpret_cast<IBinder*>(flat->cookie); 277 return finish_unflatten_binder(NULL, *flat, in); 278 case BINDER_TYPE_WEAK_BINDER: 279 if (flat->binder != 0) { 280 out->set_object_and_refs( 281 reinterpret_cast<IBinder*>(flat->cookie), 282 reinterpret_cast<RefBase::weakref_type*>(flat->binder)); 283 } else { 284 *out = NULL; 285 } 286 return finish_unflatten_binder(NULL, *flat, in); 287 case BINDER_TYPE_HANDLE: 288 case BINDER_TYPE_WEAK_HANDLE: 289 *out = proc->getWeakProxyForHandle(flat->handle); 290 return finish_unflatten_binder( 291 static_cast<BpBinder*>(out->unsafe_get()), *flat, in); 292 } 293 } 294 return BAD_TYPE; 295} 296 297// --------------------------------------------------------------------------- 298 299Parcel::Parcel() 300{ 301 LOG_ALLOC("Parcel %p: constructing", this); 302 initState(); 303} 304 305Parcel::~Parcel() 306{ 307 freeDataNoInit(); 308 LOG_ALLOC("Parcel %p: destroyed", this); 309} 310 311size_t Parcel::getGlobalAllocSize() { 312 pthread_mutex_lock(&gParcelGlobalAllocSizeLock); 313 size_t size = gParcelGlobalAllocSize; 314 pthread_mutex_unlock(&gParcelGlobalAllocSizeLock); 315 return size; 316} 317 318size_t Parcel::getGlobalAllocCount() { 319 pthread_mutex_lock(&gParcelGlobalAllocSizeLock); 320 size_t count = gParcelGlobalAllocCount; 321 pthread_mutex_unlock(&gParcelGlobalAllocSizeLock); 322 return count; 323} 324 325const uint8_t* Parcel::data() const 326{ 327 return mData; 328} 329 330size_t Parcel::dataSize() const 331{ 332 return (mDataSize > mDataPos ? mDataSize : mDataPos); 333} 334 335size_t Parcel::dataAvail() const 336{ 337 // TODO: decide what to do about the possibility that this can 338 // report an available-data size that exceeds a Java int's max 339 // positive value, causing havoc. Fortunately this will only 340 // happen if someone constructs a Parcel containing more than two 341 // gigabytes of data, which on typical phone hardware is simply 342 // not possible. 343 return dataSize() - dataPosition(); 344} 345 346size_t Parcel::dataPosition() const 347{ 348 return mDataPos; 349} 350 351size_t Parcel::dataCapacity() const 352{ 353 return mDataCapacity; 354} 355 356status_t Parcel::setDataSize(size_t size) 357{ 358 status_t err; 359 err = continueWrite(size); 360 if (err == NO_ERROR) { 361 mDataSize = size; 362 ALOGV("setDataSize Setting data size of %p to %zu", this, mDataSize); 363 } 364 return err; 365} 366 367void Parcel::setDataPosition(size_t pos) const 368{ 369 mDataPos = pos; 370 mNextObjectHint = 0; 371} 372 373status_t Parcel::setDataCapacity(size_t size) 374{ 375 if (size > mDataCapacity) return continueWrite(size); 376 return NO_ERROR; 377} 378 379status_t Parcel::setData(const uint8_t* buffer, size_t len) 380{ 381 status_t err = restartWrite(len); 382 if (err == NO_ERROR) { 383 memcpy(const_cast<uint8_t*>(data()), buffer, len); 384 mDataSize = len; 385 mFdsKnown = false; 386 } 387 return err; 388} 389 390status_t Parcel::appendFrom(const Parcel *parcel, size_t offset, size_t len) 391{ 392 const sp<ProcessState> proc(ProcessState::self()); 393 status_t err; 394 const uint8_t *data = parcel->mData; 395 const binder_size_t *objects = parcel->mObjects; 396 size_t size = parcel->mObjectsSize; 397 int startPos = mDataPos; 398 int firstIndex = -1, lastIndex = -2; 399 400 if (len == 0) { 401 return NO_ERROR; 402 } 403 404 // range checks against the source parcel size 405 if ((offset > parcel->mDataSize) 406 || (len > parcel->mDataSize) 407 || (offset + len > parcel->mDataSize)) { 408 return BAD_VALUE; 409 } 410 411 // Count objects in range 412 for (int i = 0; i < (int) size; i++) { 413 size_t off = objects[i]; 414 if ((off >= offset) && (off < offset + len)) { 415 if (firstIndex == -1) { 416 firstIndex = i; 417 } 418 lastIndex = i; 419 } 420 } 421 int numObjects = lastIndex - firstIndex + 1; 422 423 if ((mDataSize+len) > mDataCapacity) { 424 // grow data 425 err = growData(len); 426 if (err != NO_ERROR) { 427 return err; 428 } 429 } 430 431 // append data 432 memcpy(mData + mDataPos, data + offset, len); 433 mDataPos += len; 434 mDataSize += len; 435 436 err = NO_ERROR; 437 438 if (numObjects > 0) { 439 // grow objects 440 if (mObjectsCapacity < mObjectsSize + numObjects) { 441 int newSize = ((mObjectsSize + numObjects)*3)/2; 442 binder_size_t *objects = 443 (binder_size_t*)realloc(mObjects, newSize*sizeof(binder_size_t)); 444 if (objects == (binder_size_t*)0) { 445 return NO_MEMORY; 446 } 447 mObjects = objects; 448 mObjectsCapacity = newSize; 449 } 450 451 // append and acquire objects 452 int idx = mObjectsSize; 453 for (int i = firstIndex; i <= lastIndex; i++) { 454 size_t off = objects[i] - offset + startPos; 455 mObjects[idx++] = off; 456 mObjectsSize++; 457 458 flat_binder_object* flat 459 = reinterpret_cast<flat_binder_object*>(mData + off); 460 acquire_object(proc, *flat, this); 461 462 if (flat->type == BINDER_TYPE_FD) { 463 // If this is a file descriptor, we need to dup it so the 464 // new Parcel now owns its own fd, and can declare that we 465 // officially know we have fds. 466 flat->handle = dup(flat->handle); 467 flat->cookie = 1; 468 mHasFds = mFdsKnown = true; 469 if (!mAllowFds) { 470 err = FDS_NOT_ALLOWED; 471 } 472 } 473 } 474 } 475 476 return err; 477} 478 479bool Parcel::pushAllowFds(bool allowFds) 480{ 481 const bool origValue = mAllowFds; 482 if (!allowFds) { 483 mAllowFds = false; 484 } 485 return origValue; 486} 487 488void Parcel::restoreAllowFds(bool lastValue) 489{ 490 mAllowFds = lastValue; 491} 492 493bool Parcel::hasFileDescriptors() const 494{ 495 if (!mFdsKnown) { 496 scanForFds(); 497 } 498 return mHasFds; 499} 500 501// Write RPC headers. (previously just the interface token) 502status_t Parcel::writeInterfaceToken(const String16& interface) 503{ 504 writeInt32(IPCThreadState::self()->getStrictModePolicy() | 505 STRICT_MODE_PENALTY_GATHER); 506 // currently the interface identification token is just its name as a string 507 return writeString16(interface); 508} 509 510bool Parcel::checkInterface(IBinder* binder) const 511{ 512 return enforceInterface(binder->getInterfaceDescriptor()); 513} 514 515bool Parcel::enforceInterface(const String16& interface, 516 IPCThreadState* threadState) const 517{ 518 int32_t strictPolicy = readInt32(); 519 if (threadState == NULL) { 520 threadState = IPCThreadState::self(); 521 } 522 if ((threadState->getLastTransactionBinderFlags() & 523 IBinder::FLAG_ONEWAY) != 0) { 524 // For one-way calls, the callee is running entirely 525 // disconnected from the caller, so disable StrictMode entirely. 526 // Not only does disk/network usage not impact the caller, but 527 // there's no way to commuicate back any violations anyway. 528 threadState->setStrictModePolicy(0); 529 } else { 530 threadState->setStrictModePolicy(strictPolicy); 531 } 532 const String16 str(readString16()); 533 if (str == interface) { 534 return true; 535 } else { 536 ALOGW("**** enforceInterface() expected '%s' but read '%s'", 537 String8(interface).string(), String8(str).string()); 538 return false; 539 } 540} 541 542const binder_size_t* Parcel::objects() const 543{ 544 return mObjects; 545} 546 547size_t Parcel::objectsCount() const 548{ 549 return mObjectsSize; 550} 551 552status_t Parcel::errorCheck() const 553{ 554 return mError; 555} 556 557void Parcel::setError(status_t err) 558{ 559 mError = err; 560} 561 562status_t Parcel::finishWrite(size_t len) 563{ 564 //printf("Finish write of %d\n", len); 565 mDataPos += len; 566 ALOGV("finishWrite Setting data pos of %p to %zu", this, mDataPos); 567 if (mDataPos > mDataSize) { 568 mDataSize = mDataPos; 569 ALOGV("finishWrite Setting data size of %p to %zu", this, mDataSize); 570 } 571 //printf("New pos=%d, size=%d\n", mDataPos, mDataSize); 572 return NO_ERROR; 573} 574 575status_t Parcel::writeUnpadded(const void* data, size_t len) 576{ 577 size_t end = mDataPos + len; 578 if (end < mDataPos) { 579 // integer overflow 580 return BAD_VALUE; 581 } 582 583 if (end <= mDataCapacity) { 584restart_write: 585 memcpy(mData+mDataPos, data, len); 586 return finishWrite(len); 587 } 588 589 status_t err = growData(len); 590 if (err == NO_ERROR) goto restart_write; 591 return err; 592} 593 594status_t Parcel::write(const void* data, size_t len) 595{ 596 void* const d = writeInplace(len); 597 if (d) { 598 memcpy(d, data, len); 599 return NO_ERROR; 600 } 601 return mError; 602} 603 604void* Parcel::writeInplace(size_t len) 605{ 606 const size_t padded = PAD_SIZE(len); 607 608 // sanity check for integer overflow 609 if (mDataPos+padded < mDataPos) { 610 return NULL; 611 } 612 613 if ((mDataPos+padded) <= mDataCapacity) { 614restart_write: 615 //printf("Writing %ld bytes, padded to %ld\n", len, padded); 616 uint8_t* const data = mData+mDataPos; 617 618 // Need to pad at end? 619 if (padded != len) { 620#if BYTE_ORDER == BIG_ENDIAN 621 static const uint32_t mask[4] = { 622 0x00000000, 0xffffff00, 0xffff0000, 0xff000000 623 }; 624#endif 625#if BYTE_ORDER == LITTLE_ENDIAN 626 static const uint32_t mask[4] = { 627 0x00000000, 0x00ffffff, 0x0000ffff, 0x000000ff 628 }; 629#endif 630 //printf("Applying pad mask: %p to %p\n", (void*)mask[padded-len], 631 // *reinterpret_cast<void**>(data+padded-4)); 632 *reinterpret_cast<uint32_t*>(data+padded-4) &= mask[padded-len]; 633 } 634 635 finishWrite(padded); 636 return data; 637 } 638 639 status_t err = growData(padded); 640 if (err == NO_ERROR) goto restart_write; 641 return NULL; 642} 643 644status_t Parcel::writeInt32(int32_t val) 645{ 646 return writeAligned(val); 647} 648 649status_t Parcel::writeUint32(uint32_t val) 650{ 651 return writeAligned(val); 652} 653 654status_t Parcel::writeInt32Array(size_t len, const int32_t *val) { 655 if (!val) { 656 return writeAligned(-1); 657 } 658 status_t ret = writeAligned(len); 659 if (ret == NO_ERROR) { 660 ret = write(val, len * sizeof(*val)); 661 } 662 return ret; 663} 664status_t Parcel::writeByteArray(size_t len, const uint8_t *val) { 665 if (!val) { 666 return writeAligned(-1); 667 } 668 status_t ret = writeAligned(len); 669 if (ret == NO_ERROR) { 670 ret = write(val, len * sizeof(*val)); 671 } 672 return ret; 673} 674 675status_t Parcel::writeInt64(int64_t val) 676{ 677 return writeAligned(val); 678} 679 680status_t Parcel::writePointer(uintptr_t val) 681{ 682 return writeAligned<binder_uintptr_t>(val); 683} 684 685status_t Parcel::writeFloat(float val) 686{ 687 return writeAligned(val); 688} 689 690#if defined(__mips__) && defined(__mips_hard_float) 691 692status_t Parcel::writeDouble(double val) 693{ 694 union { 695 double d; 696 unsigned long long ll; 697 } u; 698 u.d = val; 699 return writeAligned(u.ll); 700} 701 702#else 703 704status_t Parcel::writeDouble(double val) 705{ 706 return writeAligned(val); 707} 708 709#endif 710 711status_t Parcel::writeCString(const char* str) 712{ 713 return write(str, strlen(str)+1); 714} 715 716status_t Parcel::writeString8(const String8& str) 717{ 718 status_t err = writeInt32(str.bytes()); 719 // only write string if its length is more than zero characters, 720 // as readString8 will only read if the length field is non-zero. 721 // this is slightly different from how writeString16 works. 722 if (str.bytes() > 0 && err == NO_ERROR) { 723 err = write(str.string(), str.bytes()+1); 724 } 725 return err; 726} 727 728status_t Parcel::writeString16(const String16& str) 729{ 730 return writeString16(str.string(), str.size()); 731} 732 733status_t Parcel::writeString16(const char16_t* str, size_t len) 734{ 735 if (str == NULL) return writeInt32(-1); 736 737 status_t err = writeInt32(len); 738 if (err == NO_ERROR) { 739 len *= sizeof(char16_t); 740 uint8_t* data = (uint8_t*)writeInplace(len+sizeof(char16_t)); 741 if (data) { 742 memcpy(data, str, len); 743 *reinterpret_cast<char16_t*>(data+len) = 0; 744 return NO_ERROR; 745 } 746 err = mError; 747 } 748 return err; 749} 750 751status_t Parcel::writeStrongBinder(const sp<IBinder>& val) 752{ 753 return flatten_binder(ProcessState::self(), val, this); 754} 755 756status_t Parcel::writeWeakBinder(const wp<IBinder>& val) 757{ 758 return flatten_binder(ProcessState::self(), val, this); 759} 760 761status_t Parcel::writeNativeHandle(const native_handle* handle) 762{ 763 if (!handle || handle->version != sizeof(native_handle)) 764 return BAD_TYPE; 765 766 status_t err; 767 err = writeInt32(handle->numFds); 768 if (err != NO_ERROR) return err; 769 770 err = writeInt32(handle->numInts); 771 if (err != NO_ERROR) return err; 772 773 for (int i=0 ; err==NO_ERROR && i<handle->numFds ; i++) 774 err = writeDupFileDescriptor(handle->data[i]); 775 776 if (err != NO_ERROR) { 777 ALOGD("write native handle, write dup fd failed"); 778 return err; 779 } 780 err = write(handle->data + handle->numFds, sizeof(int)*handle->numInts); 781 return err; 782} 783 784status_t Parcel::writeFileDescriptor(int fd, bool takeOwnership) 785{ 786 flat_binder_object obj; 787 obj.type = BINDER_TYPE_FD; 788 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 789 obj.binder = 0; /* Don't pass uninitialized stack data to a remote process */ 790 obj.handle = fd; 791 obj.cookie = takeOwnership ? 1 : 0; 792 return writeObject(obj, true); 793} 794 795status_t Parcel::writeDupFileDescriptor(int fd) 796{ 797 int dupFd = dup(fd); 798 if (dupFd < 0) { 799 return -errno; 800 } 801 status_t err = writeFileDescriptor(dupFd, true /*takeOwnership*/); 802 if (err) { 803 close(dupFd); 804 } 805 return err; 806} 807 808// WARNING: This method must stay in sync with 809// Parcelable.Creator<ParcelFileDescriptor> CREATOR 810// in frameworks/base/core/java/android/os/ParcelFileDescriptor.java 811status_t Parcel::writeParcelFileDescriptor(int fd, int commChannel) { 812 status_t status; 813 814 if (fd < 0) { 815 status = writeInt32(0); // ParcelFileDescriptor is null 816 if (status) return status; 817 } else { 818 status = writeInt32(1); // ParcelFileDescriptor is not null 819 if (status) return status; 820 status = writeDupFileDescriptor(fd); 821 if (status) return status; 822 if (commChannel < 0) { 823 status = writeInt32(0); // commChannel is null 824 if (status) return status; 825 } else { 826 status = writeInt32(1); // commChannel is not null 827 if (status) return status; 828 status = writeDupFileDescriptor(commChannel); 829 } 830 } 831 return status; 832} 833 834status_t Parcel::writeBlob(size_t len, WritableBlob* outBlob) 835{ 836 status_t status; 837 838 if (!mAllowFds || len <= IN_PLACE_BLOB_LIMIT) { 839 ALOGV("writeBlob: write in place"); 840 status = writeInt32(0); 841 if (status) return status; 842 843 void* ptr = writeInplace(len); 844 if (!ptr) return NO_MEMORY; 845 846 outBlob->init(false /*mapped*/, ptr, len); 847 return NO_ERROR; 848 } 849 850 ALOGV("writeBlob: write to ashmem"); 851 int fd = ashmem_create_region("Parcel Blob", len); 852 if (fd < 0) return NO_MEMORY; 853 854 int result = ashmem_set_prot_region(fd, PROT_READ | PROT_WRITE); 855 if (result < 0) { 856 status = result; 857 } else { 858 void* ptr = ::mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); 859 if (ptr == MAP_FAILED) { 860 status = -errno; 861 } else { 862 result = ashmem_set_prot_region(fd, PROT_READ); 863 if (result < 0) { 864 status = result; 865 } else { 866 status = writeInt32(1); 867 if (!status) { 868 status = writeFileDescriptor(fd, true /*takeOwnership*/); 869 if (!status) { 870 outBlob->init(true /*mapped*/, ptr, len); 871 return NO_ERROR; 872 } 873 } 874 } 875 } 876 ::munmap(ptr, len); 877 } 878 ::close(fd); 879 return status; 880} 881 882status_t Parcel::write(const FlattenableHelperInterface& val) 883{ 884 status_t err; 885 886 // size if needed 887 const size_t len = val.getFlattenedSize(); 888 const size_t fd_count = val.getFdCount(); 889 890 err = this->writeInt32(len); 891 if (err) return err; 892 893 err = this->writeInt32(fd_count); 894 if (err) return err; 895 896 // payload 897 void* const buf = this->writeInplace(PAD_SIZE(len)); 898 if (buf == NULL) 899 return BAD_VALUE; 900 901 int* fds = NULL; 902 if (fd_count) { 903 fds = new int[fd_count]; 904 } 905 906 err = val.flatten(buf, len, fds, fd_count); 907 for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) { 908 err = this->writeDupFileDescriptor( fds[i] ); 909 } 910 911 if (fd_count) { 912 delete [] fds; 913 } 914 915 return err; 916} 917 918status_t Parcel::writeObject(const flat_binder_object& val, bool nullMetaData) 919{ 920 const bool enoughData = (mDataPos+sizeof(val)) <= mDataCapacity; 921 const bool enoughObjects = mObjectsSize < mObjectsCapacity; 922 if (enoughData && enoughObjects) { 923restart_write: 924 *reinterpret_cast<flat_binder_object*>(mData+mDataPos) = val; 925 926 // Need to write meta-data? 927 if (nullMetaData || val.binder != 0) { 928 mObjects[mObjectsSize] = mDataPos; 929 acquire_object(ProcessState::self(), val, this); 930 mObjectsSize++; 931 } 932 933 // remember if it's a file descriptor 934 if (val.type == BINDER_TYPE_FD) { 935 if (!mAllowFds) { 936 return FDS_NOT_ALLOWED; 937 } 938 mHasFds = mFdsKnown = true; 939 } 940 941 return finishWrite(sizeof(flat_binder_object)); 942 } 943 944 if (!enoughData) { 945 const status_t err = growData(sizeof(val)); 946 if (err != NO_ERROR) return err; 947 } 948 if (!enoughObjects) { 949 size_t newSize = ((mObjectsSize+2)*3)/2; 950 binder_size_t* objects = (binder_size_t*)realloc(mObjects, newSize*sizeof(binder_size_t)); 951 if (objects == NULL) return NO_MEMORY; 952 mObjects = objects; 953 mObjectsCapacity = newSize; 954 } 955 956 goto restart_write; 957} 958 959status_t Parcel::writeNoException() 960{ 961 return writeInt32(0); 962} 963 964void Parcel::remove(size_t /*start*/, size_t /*amt*/) 965{ 966 LOG_ALWAYS_FATAL("Parcel::remove() not yet implemented!"); 967} 968 969status_t Parcel::read(void* outData, size_t len) const 970{ 971 if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize 972 && len <= PAD_SIZE(len)) { 973 memcpy(outData, mData+mDataPos, len); 974 mDataPos += PAD_SIZE(len); 975 ALOGV("read Setting data pos of %p to %zu", this, mDataPos); 976 return NO_ERROR; 977 } 978 return NOT_ENOUGH_DATA; 979} 980 981const void* Parcel::readInplace(size_t len) const 982{ 983 if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize 984 && len <= PAD_SIZE(len)) { 985 const void* data = mData+mDataPos; 986 mDataPos += PAD_SIZE(len); 987 ALOGV("readInplace Setting data pos of %p to %zu", this, mDataPos); 988 return data; 989 } 990 return NULL; 991} 992 993template<class T> 994status_t Parcel::readAligned(T *pArg) const { 995 COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T)); 996 997 if ((mDataPos+sizeof(T)) <= mDataSize) { 998 const void* data = mData+mDataPos; 999 mDataPos += sizeof(T); 1000 *pArg = *reinterpret_cast<const T*>(data); 1001 return NO_ERROR; 1002 } else { 1003 return NOT_ENOUGH_DATA; 1004 } 1005} 1006 1007template<class T> 1008T Parcel::readAligned() const { 1009 T result; 1010 if (readAligned(&result) != NO_ERROR) { 1011 result = 0; 1012 } 1013 1014 return result; 1015} 1016 1017template<class T> 1018status_t Parcel::writeAligned(T val) { 1019 COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T)); 1020 1021 if ((mDataPos+sizeof(val)) <= mDataCapacity) { 1022restart_write: 1023 *reinterpret_cast<T*>(mData+mDataPos) = val; 1024 return finishWrite(sizeof(val)); 1025 } 1026 1027 status_t err = growData(sizeof(val)); 1028 if (err == NO_ERROR) goto restart_write; 1029 return err; 1030} 1031 1032status_t Parcel::readInt32(int32_t *pArg) const 1033{ 1034 return readAligned(pArg); 1035} 1036 1037int32_t Parcel::readInt32() const 1038{ 1039 return readAligned<int32_t>(); 1040} 1041 1042status_t Parcel::readUint32(uint32_t *pArg) const 1043{ 1044 return readAligned(pArg); 1045} 1046 1047uint32_t Parcel::readUint32() const 1048{ 1049 return readAligned<uint32_t>(); 1050} 1051 1052status_t Parcel::readInt64(int64_t *pArg) const 1053{ 1054 return readAligned(pArg); 1055} 1056 1057 1058int64_t Parcel::readInt64() const 1059{ 1060 return readAligned<int64_t>(); 1061} 1062 1063status_t Parcel::readPointer(uintptr_t *pArg) const 1064{ 1065 status_t ret; 1066 binder_uintptr_t ptr; 1067 ret = readAligned(&ptr); 1068 if (!ret) 1069 *pArg = ptr; 1070 return ret; 1071} 1072 1073uintptr_t Parcel::readPointer() const 1074{ 1075 return readAligned<binder_uintptr_t>(); 1076} 1077 1078 1079status_t Parcel::readFloat(float *pArg) const 1080{ 1081 return readAligned(pArg); 1082} 1083 1084 1085float Parcel::readFloat() const 1086{ 1087 return readAligned<float>(); 1088} 1089 1090#if defined(__mips__) && defined(__mips_hard_float) 1091 1092status_t Parcel::readDouble(double *pArg) const 1093{ 1094 union { 1095 double d; 1096 unsigned long long ll; 1097 } u; 1098 u.d = 0; 1099 status_t status; 1100 status = readAligned(&u.ll); 1101 *pArg = u.d; 1102 return status; 1103} 1104 1105double Parcel::readDouble() const 1106{ 1107 union { 1108 double d; 1109 unsigned long long ll; 1110 } u; 1111 u.ll = readAligned<unsigned long long>(); 1112 return u.d; 1113} 1114 1115#else 1116 1117status_t Parcel::readDouble(double *pArg) const 1118{ 1119 return readAligned(pArg); 1120} 1121 1122double Parcel::readDouble() const 1123{ 1124 return readAligned<double>(); 1125} 1126 1127#endif 1128 1129status_t Parcel::readIntPtr(intptr_t *pArg) const 1130{ 1131 return readAligned(pArg); 1132} 1133 1134 1135intptr_t Parcel::readIntPtr() const 1136{ 1137 return readAligned<intptr_t>(); 1138} 1139 1140 1141const char* Parcel::readCString() const 1142{ 1143 const size_t avail = mDataSize-mDataPos; 1144 if (avail > 0) { 1145 const char* str = reinterpret_cast<const char*>(mData+mDataPos); 1146 // is the string's trailing NUL within the parcel's valid bounds? 1147 const char* eos = reinterpret_cast<const char*>(memchr(str, 0, avail)); 1148 if (eos) { 1149 const size_t len = eos - str; 1150 mDataPos += PAD_SIZE(len+1); 1151 ALOGV("readCString Setting data pos of %p to %zu", this, mDataPos); 1152 return str; 1153 } 1154 } 1155 return NULL; 1156} 1157 1158String8 Parcel::readString8() const 1159{ 1160 int32_t size = readInt32(); 1161 // watch for potential int overflow adding 1 for trailing NUL 1162 if (size > 0 && size < INT32_MAX) { 1163 const char* str = (const char*)readInplace(size+1); 1164 if (str) return String8(str, size); 1165 } 1166 return String8(); 1167} 1168 1169String16 Parcel::readString16() const 1170{ 1171 size_t len; 1172 const char16_t* str = readString16Inplace(&len); 1173 if (str) return String16(str, len); 1174 ALOGE("Reading a NULL string not supported here."); 1175 return String16(); 1176} 1177 1178const char16_t* Parcel::readString16Inplace(size_t* outLen) const 1179{ 1180 int32_t size = readInt32(); 1181 // watch for potential int overflow from size+1 1182 if (size >= 0 && size < INT32_MAX) { 1183 *outLen = size; 1184 const char16_t* str = (const char16_t*)readInplace((size+1)*sizeof(char16_t)); 1185 if (str != NULL) { 1186 return str; 1187 } 1188 } 1189 *outLen = 0; 1190 return NULL; 1191} 1192 1193sp<IBinder> Parcel::readStrongBinder() const 1194{ 1195 sp<IBinder> val; 1196 unflatten_binder(ProcessState::self(), *this, &val); 1197 return val; 1198} 1199 1200wp<IBinder> Parcel::readWeakBinder() const 1201{ 1202 wp<IBinder> val; 1203 unflatten_binder(ProcessState::self(), *this, &val); 1204 return val; 1205} 1206 1207int32_t Parcel::readExceptionCode() const 1208{ 1209 int32_t exception_code = readAligned<int32_t>(); 1210 if (exception_code == EX_HAS_REPLY_HEADER) { 1211 int32_t header_start = dataPosition(); 1212 int32_t header_size = readAligned<int32_t>(); 1213 // Skip over fat responses headers. Not used (or propagated) in 1214 // native code 1215 setDataPosition(header_start + header_size); 1216 // And fat response headers are currently only used when there are no 1217 // exceptions, so return no error: 1218 return 0; 1219 } 1220 return exception_code; 1221} 1222 1223native_handle* Parcel::readNativeHandle() const 1224{ 1225 int numFds, numInts; 1226 status_t err; 1227 err = readInt32(&numFds); 1228 if (err != NO_ERROR) return 0; 1229 err = readInt32(&numInts); 1230 if (err != NO_ERROR) return 0; 1231 1232 native_handle* h = native_handle_create(numFds, numInts); 1233 for (int i=0 ; err==NO_ERROR && i<numFds ; i++) { 1234 h->data[i] = dup(readFileDescriptor()); 1235 if (h->data[i] < 0) err = BAD_VALUE; 1236 } 1237 err = read(h->data + numFds, sizeof(int)*numInts); 1238 if (err != NO_ERROR) { 1239 native_handle_close(h); 1240 native_handle_delete(h); 1241 h = 0; 1242 } 1243 return h; 1244} 1245 1246 1247int Parcel::readFileDescriptor() const 1248{ 1249 const flat_binder_object* flat = readObject(true); 1250 if (flat) { 1251 switch (flat->type) { 1252 case BINDER_TYPE_FD: 1253 //ALOGI("Returning file descriptor %ld from parcel %p", flat->handle, this); 1254 return flat->handle; 1255 } 1256 } 1257 return BAD_TYPE; 1258} 1259 1260// WARNING: This method must stay in sync with writeToParcel() 1261// in frameworks/base/core/java/android/os/ParcelFileDescriptor.java 1262int Parcel::readParcelFileDescriptor(int& outCommChannel) const { 1263 int fd; 1264 outCommChannel = -1; 1265 1266 if (readInt32() == 0) { 1267 fd = -1; 1268 } else { 1269 fd = readFileDescriptor(); 1270 if (fd >= 0 && readInt32() != 0) { 1271 outCommChannel = readFileDescriptor(); 1272 } 1273 } 1274 return fd; 1275} 1276 1277status_t Parcel::readBlob(size_t len, ReadableBlob* outBlob) const 1278{ 1279 int32_t useAshmem; 1280 status_t status = readInt32(&useAshmem); 1281 if (status) return status; 1282 1283 if (!useAshmem) { 1284 ALOGV("readBlob: read in place"); 1285 const void* ptr = readInplace(len); 1286 if (!ptr) return BAD_VALUE; 1287 1288 outBlob->init(false /*mapped*/, const_cast<void*>(ptr), len); 1289 return NO_ERROR; 1290 } 1291 1292 ALOGV("readBlob: read from ashmem"); 1293 int fd = readFileDescriptor(); 1294 if (fd == int(BAD_TYPE)) return BAD_VALUE; 1295 1296 void* ptr = ::mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0); 1297 if (ptr == MAP_FAILED) return NO_MEMORY; 1298 1299 outBlob->init(true /*mapped*/, ptr, len); 1300 return NO_ERROR; 1301} 1302 1303status_t Parcel::read(FlattenableHelperInterface& val) const 1304{ 1305 // size 1306 const size_t len = this->readInt32(); 1307 const size_t fd_count = this->readInt32(); 1308 1309 // payload 1310 void const* const buf = this->readInplace(PAD_SIZE(len)); 1311 if (buf == NULL) 1312 return BAD_VALUE; 1313 1314 int* fds = NULL; 1315 if (fd_count) { 1316 fds = new int[fd_count]; 1317 } 1318 1319 status_t err = NO_ERROR; 1320 for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) { 1321 fds[i] = dup(this->readFileDescriptor()); 1322 if (fds[i] < 0) { 1323 err = BAD_VALUE; 1324 ALOGE("dup() failed in Parcel::read, i is %zu, fds[i] is %d, fd_count is %zu, error: %s", 1325 i, fds[i], fd_count, strerror(errno)); 1326 } 1327 } 1328 1329 if (err == NO_ERROR) { 1330 err = val.unflatten(buf, len, fds, fd_count); 1331 } 1332 1333 if (fd_count) { 1334 delete [] fds; 1335 } 1336 1337 return err; 1338} 1339const flat_binder_object* Parcel::readObject(bool nullMetaData) const 1340{ 1341 const size_t DPOS = mDataPos; 1342 if ((DPOS+sizeof(flat_binder_object)) <= mDataSize) { 1343 const flat_binder_object* obj 1344 = reinterpret_cast<const flat_binder_object*>(mData+DPOS); 1345 mDataPos = DPOS + sizeof(flat_binder_object); 1346 if (!nullMetaData && (obj->cookie == 0 && obj->binder == 0)) { 1347 // When transferring a NULL object, we don't write it into 1348 // the object list, so we don't want to check for it when 1349 // reading. 1350 ALOGV("readObject Setting data pos of %p to %zu", this, mDataPos); 1351 return obj; 1352 } 1353 1354 // Ensure that this object is valid... 1355 binder_size_t* const OBJS = mObjects; 1356 const size_t N = mObjectsSize; 1357 size_t opos = mNextObjectHint; 1358 1359 if (N > 0) { 1360 ALOGV("Parcel %p looking for obj at %zu, hint=%zu", 1361 this, DPOS, opos); 1362 1363 // Start at the current hint position, looking for an object at 1364 // the current data position. 1365 if (opos < N) { 1366 while (opos < (N-1) && OBJS[opos] < DPOS) { 1367 opos++; 1368 } 1369 } else { 1370 opos = N-1; 1371 } 1372 if (OBJS[opos] == DPOS) { 1373 // Found it! 1374 ALOGV("Parcel %p found obj %zu at index %zu with forward search", 1375 this, DPOS, opos); 1376 mNextObjectHint = opos+1; 1377 ALOGV("readObject Setting data pos of %p to %zu", this, mDataPos); 1378 return obj; 1379 } 1380 1381 // Look backwards for it... 1382 while (opos > 0 && OBJS[opos] > DPOS) { 1383 opos--; 1384 } 1385 if (OBJS[opos] == DPOS) { 1386 // Found it! 1387 ALOGV("Parcel %p found obj %zu at index %zu with backward search", 1388 this, DPOS, opos); 1389 mNextObjectHint = opos+1; 1390 ALOGV("readObject Setting data pos of %p to %zu", this, mDataPos); 1391 return obj; 1392 } 1393 } 1394 ALOGW("Attempt to read object from Parcel %p at offset %zu that is not in the object list", 1395 this, DPOS); 1396 } 1397 return NULL; 1398} 1399 1400void Parcel::closeFileDescriptors() 1401{ 1402 size_t i = mObjectsSize; 1403 if (i > 0) { 1404 //ALOGI("Closing file descriptors for %zu objects...", i); 1405 } 1406 while (i > 0) { 1407 i--; 1408 const flat_binder_object* flat 1409 = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]); 1410 if (flat->type == BINDER_TYPE_FD) { 1411 //ALOGI("Closing fd: %ld", flat->handle); 1412 close(flat->handle); 1413 } 1414 } 1415} 1416 1417uintptr_t Parcel::ipcData() const 1418{ 1419 return reinterpret_cast<uintptr_t>(mData); 1420} 1421 1422size_t Parcel::ipcDataSize() const 1423{ 1424 return (mDataSize > mDataPos ? mDataSize : mDataPos); 1425} 1426 1427uintptr_t Parcel::ipcObjects() const 1428{ 1429 return reinterpret_cast<uintptr_t>(mObjects); 1430} 1431 1432size_t Parcel::ipcObjectsCount() const 1433{ 1434 return mObjectsSize; 1435} 1436 1437void Parcel::ipcSetDataReference(const uint8_t* data, size_t dataSize, 1438 const binder_size_t* objects, size_t objectsCount, release_func relFunc, void* relCookie) 1439{ 1440 binder_size_t minOffset = 0; 1441 freeDataNoInit(); 1442 mError = NO_ERROR; 1443 mData = const_cast<uint8_t*>(data); 1444 mDataSize = mDataCapacity = dataSize; 1445 //ALOGI("setDataReference Setting data size of %p to %lu (pid=%d)", this, mDataSize, getpid()); 1446 mDataPos = 0; 1447 ALOGV("setDataReference Setting data pos of %p to %zu", this, mDataPos); 1448 mObjects = const_cast<binder_size_t*>(objects); 1449 mObjectsSize = mObjectsCapacity = objectsCount; 1450 mNextObjectHint = 0; 1451 mOwner = relFunc; 1452 mOwnerCookie = relCookie; 1453 for (size_t i = 0; i < mObjectsSize; i++) { 1454 binder_size_t offset = mObjects[i]; 1455 if (offset < minOffset) { 1456 ALOGE("%s: bad object offset %" PRIu64 " < %" PRIu64 "\n", 1457 __func__, (uint64_t)offset, (uint64_t)minOffset); 1458 mObjectsSize = 0; 1459 break; 1460 } 1461 minOffset = offset + sizeof(flat_binder_object); 1462 } 1463 scanForFds(); 1464} 1465 1466void Parcel::print(TextOutput& to, uint32_t /*flags*/) const 1467{ 1468 to << "Parcel("; 1469 1470 if (errorCheck() != NO_ERROR) { 1471 const status_t err = errorCheck(); 1472 to << "Error: " << (void*)(intptr_t)err << " \"" << strerror(-err) << "\""; 1473 } else if (dataSize() > 0) { 1474 const uint8_t* DATA = data(); 1475 to << indent << HexDump(DATA, dataSize()) << dedent; 1476 const binder_size_t* OBJS = objects(); 1477 const size_t N = objectsCount(); 1478 for (size_t i=0; i<N; i++) { 1479 const flat_binder_object* flat 1480 = reinterpret_cast<const flat_binder_object*>(DATA+OBJS[i]); 1481 to << endl << "Object #" << i << " @ " << (void*)OBJS[i] << ": " 1482 << TypeCode(flat->type & 0x7f7f7f00) 1483 << " = " << flat->binder; 1484 } 1485 } else { 1486 to << "NULL"; 1487 } 1488 1489 to << ")"; 1490} 1491 1492void Parcel::releaseObjects() 1493{ 1494 const sp<ProcessState> proc(ProcessState::self()); 1495 size_t i = mObjectsSize; 1496 uint8_t* const data = mData; 1497 binder_size_t* const objects = mObjects; 1498 while (i > 0) { 1499 i--; 1500 const flat_binder_object* flat 1501 = reinterpret_cast<flat_binder_object*>(data+objects[i]); 1502 release_object(proc, *flat, this); 1503 } 1504} 1505 1506void Parcel::acquireObjects() 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 acquire_object(proc, *flat, this); 1517 } 1518} 1519 1520void Parcel::freeData() 1521{ 1522 freeDataNoInit(); 1523 initState(); 1524} 1525 1526void Parcel::freeDataNoInit() 1527{ 1528 if (mOwner) { 1529 LOG_ALLOC("Parcel %p: freeing other owner data", this); 1530 //ALOGI("Freeing data ref of %p (pid=%d)", this, getpid()); 1531 mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie); 1532 } else { 1533 LOG_ALLOC("Parcel %p: freeing allocated data", this); 1534 releaseObjects(); 1535 if (mData) { 1536 LOG_ALLOC("Parcel %p: freeing with %zu capacity", this, mDataCapacity); 1537 pthread_mutex_lock(&gParcelGlobalAllocSizeLock); 1538 gParcelGlobalAllocSize -= mDataCapacity; 1539 gParcelGlobalAllocCount--; 1540 pthread_mutex_unlock(&gParcelGlobalAllocSizeLock); 1541 free(mData); 1542 } 1543 if (mObjects) free(mObjects); 1544 } 1545} 1546 1547status_t Parcel::growData(size_t len) 1548{ 1549 size_t newSize = ((mDataSize+len)*3)/2; 1550 return (newSize <= mDataSize) 1551 ? (status_t) NO_MEMORY 1552 : continueWrite(newSize); 1553} 1554 1555status_t Parcel::restartWrite(size_t desired) 1556{ 1557 if (mOwner) { 1558 freeData(); 1559 return continueWrite(desired); 1560 } 1561 1562 uint8_t* data = (uint8_t*)realloc(mData, desired); 1563 if (!data && desired > mDataCapacity) { 1564 mError = NO_MEMORY; 1565 return NO_MEMORY; 1566 } 1567 1568 releaseObjects(); 1569 1570 if (data) { 1571 LOG_ALLOC("Parcel %p: restart from %zu to %zu capacity", this, mDataCapacity, desired); 1572 pthread_mutex_lock(&gParcelGlobalAllocSizeLock); 1573 gParcelGlobalAllocSize += desired; 1574 gParcelGlobalAllocSize -= mDataCapacity; 1575 pthread_mutex_unlock(&gParcelGlobalAllocSizeLock); 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 LOG_ALLOC("Parcel %p: taking ownership of %zu capacity", this, desired); 1656 pthread_mutex_lock(&gParcelGlobalAllocSizeLock); 1657 gParcelGlobalAllocSize += desired; 1658 gParcelGlobalAllocCount++; 1659 pthread_mutex_unlock(&gParcelGlobalAllocSizeLock); 1660 1661 mData = data; 1662 mObjects = objects; 1663 mDataSize = (mDataSize < desired) ? mDataSize : desired; 1664 ALOGV("continueWrite Setting data size of %p to %zu", this, mDataSize); 1665 mDataCapacity = desired; 1666 mObjectsSize = mObjectsCapacity = objectsSize; 1667 mNextObjectHint = 0; 1668 1669 } else if (mData) { 1670 if (objectsSize < mObjectsSize) { 1671 // Need to release refs on any objects we are dropping. 1672 const sp<ProcessState> proc(ProcessState::self()); 1673 for (size_t i=objectsSize; i<mObjectsSize; i++) { 1674 const flat_binder_object* flat 1675 = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]); 1676 if (flat->type == BINDER_TYPE_FD) { 1677 // will need to rescan because we may have lopped off the only FDs 1678 mFdsKnown = false; 1679 } 1680 release_object(proc, *flat, this); 1681 } 1682 binder_size_t* objects = 1683 (binder_size_t*)realloc(mObjects, objectsSize*sizeof(binder_size_t)); 1684 if (objects) { 1685 mObjects = objects; 1686 } 1687 mObjectsSize = objectsSize; 1688 mNextObjectHint = 0; 1689 } 1690 1691 // We own the data, so we can just do a realloc(). 1692 if (desired > mDataCapacity) { 1693 uint8_t* data = (uint8_t*)realloc(mData, desired); 1694 if (data) { 1695 LOG_ALLOC("Parcel %p: continue from %zu to %zu capacity", this, mDataCapacity, 1696 desired); 1697 pthread_mutex_lock(&gParcelGlobalAllocSizeLock); 1698 gParcelGlobalAllocSize += desired; 1699 gParcelGlobalAllocSize -= mDataCapacity; 1700 pthread_mutex_unlock(&gParcelGlobalAllocSizeLock); 1701 mData = data; 1702 mDataCapacity = desired; 1703 } else if (desired > mDataCapacity) { 1704 mError = NO_MEMORY; 1705 return NO_MEMORY; 1706 } 1707 } else { 1708 if (mDataSize > desired) { 1709 mDataSize = desired; 1710 ALOGV("continueWrite Setting data size of %p to %zu", this, mDataSize); 1711 } 1712 if (mDataPos > desired) { 1713 mDataPos = desired; 1714 ALOGV("continueWrite Setting data pos of %p to %zu", this, mDataPos); 1715 } 1716 } 1717 1718 } else { 1719 // This is the first data. Easy! 1720 uint8_t* data = (uint8_t*)malloc(desired); 1721 if (!data) { 1722 mError = NO_MEMORY; 1723 return NO_MEMORY; 1724 } 1725 1726 if(!(mDataCapacity == 0 && mObjects == NULL 1727 && mObjectsCapacity == 0)) { 1728 ALOGE("continueWrite: %zu/%p/%zu/%zu", mDataCapacity, mObjects, mObjectsCapacity, desired); 1729 } 1730 1731 LOG_ALLOC("Parcel %p: allocating with %zu capacity", this, desired); 1732 pthread_mutex_lock(&gParcelGlobalAllocSizeLock); 1733 gParcelGlobalAllocSize += desired; 1734 gParcelGlobalAllocCount++; 1735 pthread_mutex_unlock(&gParcelGlobalAllocSizeLock); 1736 1737 mData = data; 1738 mDataSize = mDataPos = 0; 1739 ALOGV("continueWrite Setting data size of %p to %zu", this, mDataSize); 1740 ALOGV("continueWrite Setting data pos of %p to %zu", this, mDataPos); 1741 mDataCapacity = desired; 1742 } 1743 1744 return NO_ERROR; 1745} 1746 1747void Parcel::initState() 1748{ 1749 LOG_ALLOC("Parcel %p: initState", this); 1750 mError = NO_ERROR; 1751 mData = 0; 1752 mDataSize = 0; 1753 mDataCapacity = 0; 1754 mDataPos = 0; 1755 ALOGV("initState Setting data size of %p to %zu", this, mDataSize); 1756 ALOGV("initState Setting data pos of %p to %zu", this, mDataPos); 1757 mObjects = NULL; 1758 mObjectsSize = 0; 1759 mObjectsCapacity = 0; 1760 mNextObjectHint = 0; 1761 mHasFds = false; 1762 mFdsKnown = true; 1763 mAllowFds = true; 1764 mOwner = NULL; 1765} 1766 1767void Parcel::scanForFds() const 1768{ 1769 bool hasFds = false; 1770 for (size_t i=0; i<mObjectsSize; i++) { 1771 const flat_binder_object* flat 1772 = reinterpret_cast<const flat_binder_object*>(mData + mObjects[i]); 1773 if (flat->type == BINDER_TYPE_FD) { 1774 hasFds = true; 1775 break; 1776 } 1777 } 1778 mHasFds = hasFds; 1779 mFdsKnown = true; 1780} 1781 1782// --- Parcel::Blob --- 1783 1784Parcel::Blob::Blob() : 1785 mMapped(false), mData(NULL), mSize(0) { 1786} 1787 1788Parcel::Blob::~Blob() { 1789 release(); 1790} 1791 1792void Parcel::Blob::release() { 1793 if (mMapped && mData) { 1794 ::munmap(mData, mSize); 1795 } 1796 clear(); 1797} 1798 1799void Parcel::Blob::init(bool mapped, void* data, size_t size) { 1800 mMapped = mapped; 1801 mData = data; 1802 mSize = size; 1803} 1804 1805void Parcel::Blob::clear() { 1806 mMapped = false; 1807 mData = NULL; 1808 mSize = 0; 1809} 1810 1811}; // namespace android 1812