Parcel.cpp revision 9b5c3b9132831ba9078fc7c4001821bcfe8dd39d
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 <utils/Debug.h> 29#include <utils/Log.h> 30#include <utils/String8.h> 31#include <utils/String16.h> 32#include <utils/misc.h> 33#include <utils/Flattenable.h> 34#include <cutils/ashmem.h> 35 36#include <private/binder/binder_module.h> 37 38#include <inttypes.h> 39#include <stdio.h> 40#include <stdlib.h> 41#include <stdint.h> 42#include <sys/mman.h> 43 44#ifndef INT32_MAX 45#define INT32_MAX ((int32_t)(2147483647)) 46#endif 47 48#define LOG_REFS(...) 49//#define LOG_REFS(...) ALOG(LOG_DEBUG, "Parcel", __VA_ARGS__) 50 51// --------------------------------------------------------------------------- 52 53#define PAD_SIZE(s) (((s)+3)&~3) 54 55// Note: must be kept in sync with android/os/StrictMode.java's PENALTY_GATHER 56#define STRICT_MODE_PENALTY_GATHER 0x100 57 58// Note: must be kept in sync with android/os/Parcel.java's EX_HAS_REPLY_HEADER 59#define EX_HAS_REPLY_HEADER -128 60 61// Maximum size of a blob to transfer in-place. 62static const size_t IN_PLACE_BLOB_LIMIT = 40 * 1024; 63 64// XXX This can be made public if we want to provide 65// support for typed data. 66struct small_flat_data 67{ 68 uint32_t type; 69 uint32_t data; 70}; 71 72namespace android { 73 74void acquire_object(const sp<ProcessState>& proc, 75 const flat_binder_object& obj, const void* who) 76{ 77 switch (obj.type) { 78 case BINDER_TYPE_BINDER: 79 if (obj.binder) { 80 LOG_REFS("Parcel %p acquiring reference on local %p", who, obj.cookie); 81 reinterpret_cast<IBinder*>(obj.cookie)->incStrong(who); 82 } 83 return; 84 case BINDER_TYPE_WEAK_BINDER: 85 if (obj.binder) 86 reinterpret_cast<RefBase::weakref_type*>(obj.binder)->incWeak(who); 87 return; 88 case BINDER_TYPE_HANDLE: { 89 const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle); 90 if (b != NULL) { 91 LOG_REFS("Parcel %p acquiring reference on remote %p", who, b.get()); 92 b->incStrong(who); 93 } 94 return; 95 } 96 case BINDER_TYPE_WEAK_HANDLE: { 97 const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle); 98 if (b != NULL) b.get_refs()->incWeak(who); 99 return; 100 } 101 case BINDER_TYPE_FD: { 102 // intentionally blank -- nothing to do to acquire this, but we do 103 // recognize it as a legitimate object type. 104 return; 105 } 106 } 107 108 ALOGD("Invalid object type 0x%08x", obj.type); 109} 110 111void release_object(const sp<ProcessState>& proc, 112 const flat_binder_object& obj, const void* who) 113{ 114 switch (obj.type) { 115 case BINDER_TYPE_BINDER: 116 if (obj.binder) { 117 LOG_REFS("Parcel %p releasing reference on local %p", who, obj.cookie); 118 reinterpret_cast<IBinder*>(obj.cookie)->decStrong(who); 119 } 120 return; 121 case BINDER_TYPE_WEAK_BINDER: 122 if (obj.binder) 123 reinterpret_cast<RefBase::weakref_type*>(obj.binder)->decWeak(who); 124 return; 125 case BINDER_TYPE_HANDLE: { 126 const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle); 127 if (b != NULL) { 128 LOG_REFS("Parcel %p releasing reference on remote %p", who, b.get()); 129 b->decStrong(who); 130 } 131 return; 132 } 133 case BINDER_TYPE_WEAK_HANDLE: { 134 const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle); 135 if (b != NULL) b.get_refs()->decWeak(who); 136 return; 137 } 138 case BINDER_TYPE_FD: { 139 if (obj.cookie != 0) close(obj.handle); 140 return; 141 } 142 } 143 144 ALOGE("Invalid object type 0x%08x", obj.type); 145} 146 147inline static status_t finish_flatten_binder( 148 const sp<IBinder>& /*binder*/, const flat_binder_object& flat, Parcel* out) 149{ 150 return out->writeObject(flat, false); 151} 152 153status_t flatten_binder(const sp<ProcessState>& /*proc*/, 154 const sp<IBinder>& binder, Parcel* out) 155{ 156 flat_binder_object obj; 157 158 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 159 if (binder != NULL) { 160 IBinder *local = binder->localBinder(); 161 if (!local) { 162 BpBinder *proxy = binder->remoteBinder(); 163 if (proxy == NULL) { 164 ALOGE("null proxy"); 165 } 166 const int32_t handle = proxy ? proxy->handle() : 0; 167 obj.type = BINDER_TYPE_HANDLE; 168 obj.handle = handle; 169 obj.cookie = 0; 170 } else { 171 obj.type = BINDER_TYPE_BINDER; 172 obj.binder = reinterpret_cast<uintptr_t>(local->getWeakRefs()); 173 obj.cookie = reinterpret_cast<uintptr_t>(local); 174 } 175 } else { 176 obj.type = BINDER_TYPE_BINDER; 177 obj.binder = 0; 178 obj.cookie = 0; 179 } 180 181 return finish_flatten_binder(binder, obj, out); 182} 183 184status_t flatten_binder(const sp<ProcessState>& /*proc*/, 185 const wp<IBinder>& binder, Parcel* out) 186{ 187 flat_binder_object obj; 188 189 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 190 if (binder != NULL) { 191 sp<IBinder> real = binder.promote(); 192 if (real != NULL) { 193 IBinder *local = real->localBinder(); 194 if (!local) { 195 BpBinder *proxy = real->remoteBinder(); 196 if (proxy == NULL) { 197 ALOGE("null proxy"); 198 } 199 const int32_t handle = proxy ? proxy->handle() : 0; 200 obj.type = BINDER_TYPE_WEAK_HANDLE; 201 obj.handle = handle; 202 obj.cookie = 0; 203 } else { 204 obj.type = BINDER_TYPE_WEAK_BINDER; 205 obj.binder = reinterpret_cast<uintptr_t>(binder.get_refs()); 206 obj.cookie = reinterpret_cast<uintptr_t>(binder.unsafe_get()); 207 } 208 return finish_flatten_binder(real, obj, out); 209 } 210 211 // XXX How to deal? In order to flatten the given binder, 212 // we need to probe it for information, which requires a primary 213 // reference... but we don't have one. 214 // 215 // The OpenBinder implementation uses a dynamic_cast<> here, 216 // but we can't do that with the different reference counting 217 // implementation we are using. 218 ALOGE("Unable to unflatten Binder weak reference!"); 219 obj.type = BINDER_TYPE_BINDER; 220 obj.binder = 0; 221 obj.cookie = 0; 222 return finish_flatten_binder(NULL, obj, out); 223 224 } else { 225 obj.type = BINDER_TYPE_BINDER; 226 obj.binder = 0; 227 obj.cookie = 0; 228 return finish_flatten_binder(NULL, obj, out); 229 } 230} 231 232inline static status_t finish_unflatten_binder( 233 BpBinder* /*proxy*/, const flat_binder_object& /*flat*/, 234 const Parcel& /*in*/) 235{ 236 return NO_ERROR; 237} 238 239status_t unflatten_binder(const sp<ProcessState>& proc, 240 const Parcel& in, sp<IBinder>* out) 241{ 242 const flat_binder_object* flat = in.readObject(false); 243 244 if (flat) { 245 switch (flat->type) { 246 case BINDER_TYPE_BINDER: 247 *out = reinterpret_cast<IBinder*>(flat->cookie); 248 return finish_unflatten_binder(NULL, *flat, in); 249 case BINDER_TYPE_HANDLE: 250 *out = proc->getStrongProxyForHandle(flat->handle); 251 return finish_unflatten_binder( 252 static_cast<BpBinder*>(out->get()), *flat, in); 253 } 254 } 255 return BAD_TYPE; 256} 257 258status_t unflatten_binder(const sp<ProcessState>& proc, 259 const Parcel& in, wp<IBinder>* out) 260{ 261 const flat_binder_object* flat = in.readObject(false); 262 263 if (flat) { 264 switch (flat->type) { 265 case BINDER_TYPE_BINDER: 266 *out = reinterpret_cast<IBinder*>(flat->cookie); 267 return finish_unflatten_binder(NULL, *flat, in); 268 case BINDER_TYPE_WEAK_BINDER: 269 if (flat->binder != 0) { 270 out->set_object_and_refs( 271 reinterpret_cast<IBinder*>(flat->cookie), 272 reinterpret_cast<RefBase::weakref_type*>(flat->binder)); 273 } else { 274 *out = NULL; 275 } 276 return finish_unflatten_binder(NULL, *flat, in); 277 case BINDER_TYPE_HANDLE: 278 case BINDER_TYPE_WEAK_HANDLE: 279 *out = proc->getWeakProxyForHandle(flat->handle); 280 return finish_unflatten_binder( 281 static_cast<BpBinder*>(out->unsafe_get()), *flat, in); 282 } 283 } 284 return BAD_TYPE; 285} 286 287// --------------------------------------------------------------------------- 288 289Parcel::Parcel() 290{ 291 initState(); 292} 293 294Parcel::~Parcel() 295{ 296 freeDataNoInit(); 297} 298 299const uint8_t* Parcel::data() const 300{ 301 return mData; 302} 303 304size_t Parcel::dataSize() const 305{ 306 return (mDataSize > mDataPos ? mDataSize : mDataPos); 307} 308 309size_t Parcel::dataAvail() const 310{ 311 // TODO: decide what to do about the possibility that this can 312 // report an available-data size that exceeds a Java int's max 313 // positive value, causing havoc. Fortunately this will only 314 // happen if someone constructs a Parcel containing more than two 315 // gigabytes of data, which on typical phone hardware is simply 316 // not possible. 317 return dataSize() - dataPosition(); 318} 319 320size_t Parcel::dataPosition() const 321{ 322 return mDataPos; 323} 324 325size_t Parcel::dataCapacity() const 326{ 327 return mDataCapacity; 328} 329 330status_t Parcel::setDataSize(size_t size) 331{ 332 status_t err; 333 err = continueWrite(size); 334 if (err == NO_ERROR) { 335 mDataSize = size; 336 ALOGV("setDataSize Setting data size of %p to %d\n", this, mDataSize); 337 } 338 return err; 339} 340 341void Parcel::setDataPosition(size_t pos) const 342{ 343 mDataPos = pos; 344 mNextObjectHint = 0; 345} 346 347status_t Parcel::setDataCapacity(size_t size) 348{ 349 if (size > mDataCapacity) return continueWrite(size); 350 return NO_ERROR; 351} 352 353status_t Parcel::setData(const uint8_t* buffer, size_t len) 354{ 355 status_t err = restartWrite(len); 356 if (err == NO_ERROR) { 357 memcpy(const_cast<uint8_t*>(data()), buffer, len); 358 mDataSize = len; 359 mFdsKnown = false; 360 } 361 return err; 362} 363 364status_t Parcel::appendFrom(const Parcel *parcel, size_t offset, size_t len) 365{ 366 const sp<ProcessState> proc(ProcessState::self()); 367 status_t err; 368 const uint8_t *data = parcel->mData; 369 const binder_size_t *objects = parcel->mObjects; 370 size_t size = parcel->mObjectsSize; 371 int startPos = mDataPos; 372 int firstIndex = -1, lastIndex = -2; 373 374 if (len == 0) { 375 return NO_ERROR; 376 } 377 378 // range checks against the source parcel size 379 if ((offset > parcel->mDataSize) 380 || (len > parcel->mDataSize) 381 || (offset + len > parcel->mDataSize)) { 382 return BAD_VALUE; 383 } 384 385 // Count objects in range 386 for (int i = 0; i < (int) size; i++) { 387 size_t off = objects[i]; 388 if ((off >= offset) && (off < offset + len)) { 389 if (firstIndex == -1) { 390 firstIndex = i; 391 } 392 lastIndex = i; 393 } 394 } 395 int numObjects = lastIndex - firstIndex + 1; 396 397 if ((mDataSize+len) > mDataCapacity) { 398 // grow data 399 err = growData(len); 400 if (err != NO_ERROR) { 401 return err; 402 } 403 } 404 405 // append data 406 memcpy(mData + mDataPos, data + offset, len); 407 mDataPos += len; 408 mDataSize += len; 409 410 err = NO_ERROR; 411 412 if (numObjects > 0) { 413 // grow objects 414 if (mObjectsCapacity < mObjectsSize + numObjects) { 415 int newSize = ((mObjectsSize + numObjects)*3)/2; 416 binder_size_t *objects = 417 (binder_size_t*)realloc(mObjects, newSize*sizeof(binder_size_t)); 418 if (objects == (binder_size_t*)0) { 419 return NO_MEMORY; 420 } 421 mObjects = objects; 422 mObjectsCapacity = newSize; 423 } 424 425 // append and acquire objects 426 int idx = mObjectsSize; 427 for (int i = firstIndex; i <= lastIndex; i++) { 428 size_t off = objects[i] - offset + startPos; 429 mObjects[idx++] = off; 430 mObjectsSize++; 431 432 flat_binder_object* flat 433 = reinterpret_cast<flat_binder_object*>(mData + off); 434 acquire_object(proc, *flat, this); 435 436 if (flat->type == BINDER_TYPE_FD) { 437 // If this is a file descriptor, we need to dup it so the 438 // new Parcel now owns its own fd, and can declare that we 439 // officially know we have fds. 440 flat->handle = dup(flat->handle); 441 flat->cookie = 1; 442 mHasFds = mFdsKnown = true; 443 if (!mAllowFds) { 444 err = FDS_NOT_ALLOWED; 445 } 446 } 447 } 448 } 449 450 return err; 451} 452 453bool Parcel::pushAllowFds(bool allowFds) 454{ 455 const bool origValue = mAllowFds; 456 if (!allowFds) { 457 mAllowFds = false; 458 } 459 return origValue; 460} 461 462void Parcel::restoreAllowFds(bool lastValue) 463{ 464 mAllowFds = lastValue; 465} 466 467bool Parcel::hasFileDescriptors() const 468{ 469 if (!mFdsKnown) { 470 scanForFds(); 471 } 472 return mHasFds; 473} 474 475// Write RPC headers. (previously just the interface token) 476status_t Parcel::writeInterfaceToken(const String16& interface) 477{ 478 writeInt32(IPCThreadState::self()->getStrictModePolicy() | 479 STRICT_MODE_PENALTY_GATHER); 480 // currently the interface identification token is just its name as a string 481 return writeString16(interface); 482} 483 484bool Parcel::checkInterface(IBinder* binder) const 485{ 486 return enforceInterface(binder->getInterfaceDescriptor()); 487} 488 489bool Parcel::enforceInterface(const String16& interface, 490 IPCThreadState* threadState) const 491{ 492 int32_t strictPolicy = readInt32(); 493 if (threadState == NULL) { 494 threadState = IPCThreadState::self(); 495 } 496 if ((threadState->getLastTransactionBinderFlags() & 497 IBinder::FLAG_ONEWAY) != 0) { 498 // For one-way calls, the callee is running entirely 499 // disconnected from the caller, so disable StrictMode entirely. 500 // Not only does disk/network usage not impact the caller, but 501 // there's no way to commuicate back any violations anyway. 502 threadState->setStrictModePolicy(0); 503 } else { 504 threadState->setStrictModePolicy(strictPolicy); 505 } 506 const String16 str(readString16()); 507 if (str == interface) { 508 return true; 509 } else { 510 ALOGW("**** enforceInterface() expected '%s' but read '%s'\n", 511 String8(interface).string(), String8(str).string()); 512 return false; 513 } 514} 515 516const binder_size_t* Parcel::objects() const 517{ 518 return mObjects; 519} 520 521size_t Parcel::objectsCount() const 522{ 523 return mObjectsSize; 524} 525 526status_t Parcel::errorCheck() const 527{ 528 return mError; 529} 530 531void Parcel::setError(status_t err) 532{ 533 mError = err; 534} 535 536status_t Parcel::finishWrite(size_t len) 537{ 538 //printf("Finish write of %d\n", len); 539 mDataPos += len; 540 ALOGV("finishWrite Setting data pos of %p to %d\n", this, mDataPos); 541 if (mDataPos > mDataSize) { 542 mDataSize = mDataPos; 543 ALOGV("finishWrite Setting data size of %p to %d\n", this, mDataSize); 544 } 545 //printf("New pos=%d, size=%d\n", mDataPos, mDataSize); 546 return NO_ERROR; 547} 548 549status_t Parcel::writeUnpadded(const void* data, size_t len) 550{ 551 size_t end = mDataPos + len; 552 if (end < mDataPos) { 553 // integer overflow 554 return BAD_VALUE; 555 } 556 557 if (end <= mDataCapacity) { 558restart_write: 559 memcpy(mData+mDataPos, data, len); 560 return finishWrite(len); 561 } 562 563 status_t err = growData(len); 564 if (err == NO_ERROR) goto restart_write; 565 return err; 566} 567 568status_t Parcel::write(const void* data, size_t len) 569{ 570 void* const d = writeInplace(len); 571 if (d) { 572 memcpy(d, data, len); 573 return NO_ERROR; 574 } 575 return mError; 576} 577 578void* Parcel::writeInplace(size_t len) 579{ 580 const size_t padded = PAD_SIZE(len); 581 582 // sanity check for integer overflow 583 if (mDataPos+padded < mDataPos) { 584 return NULL; 585 } 586 587 if ((mDataPos+padded) <= mDataCapacity) { 588restart_write: 589 //printf("Writing %ld bytes, padded to %ld\n", len, padded); 590 uint8_t* const data = mData+mDataPos; 591 592 // Need to pad at end? 593 if (padded != len) { 594#if BYTE_ORDER == BIG_ENDIAN 595 static const uint32_t mask[4] = { 596 0x00000000, 0xffffff00, 0xffff0000, 0xff000000 597 }; 598#endif 599#if BYTE_ORDER == LITTLE_ENDIAN 600 static const uint32_t mask[4] = { 601 0x00000000, 0x00ffffff, 0x0000ffff, 0x000000ff 602 }; 603#endif 604 //printf("Applying pad mask: %p to %p\n", (void*)mask[padded-len], 605 // *reinterpret_cast<void**>(data+padded-4)); 606 *reinterpret_cast<uint32_t*>(data+padded-4) &= mask[padded-len]; 607 } 608 609 finishWrite(padded); 610 return data; 611 } 612 613 status_t err = growData(padded); 614 if (err == NO_ERROR) goto restart_write; 615 return NULL; 616} 617 618status_t Parcel::writeInt32(int32_t val) 619{ 620 return writeAligned(val); 621} 622status_t Parcel::writeInt32Array(size_t len, const int32_t *val) { 623 if (!val) { 624 return writeAligned(-1); 625 } 626 status_t ret = writeAligned(len); 627 if (ret == NO_ERROR) { 628 ret = write(val, len * sizeof(*val)); 629 } 630 return ret; 631} 632 633status_t Parcel::writeInt64(int64_t val) 634{ 635 return writeAligned(val); 636} 637 638status_t Parcel::writePointer(uintptr_t val) 639{ 640 return writeAligned<binder_uintptr_t>(val); 641} 642 643status_t Parcel::writeFloat(float val) 644{ 645 return writeAligned(val); 646} 647 648#if defined(__mips__) && defined(__mips_hard_float) 649 650status_t Parcel::writeDouble(double val) 651{ 652 union { 653 double d; 654 unsigned long long ll; 655 } u; 656 u.d = val; 657 return writeAligned(u.ll); 658} 659 660#else 661 662status_t Parcel::writeDouble(double val) 663{ 664 return writeAligned(val); 665} 666 667#endif 668 669status_t Parcel::writeIntPtr(intptr_t val) 670{ 671 return writeAligned(val); 672} 673 674status_t Parcel::writeCString(const char* str) 675{ 676 return write(str, strlen(str)+1); 677} 678 679status_t Parcel::writeString8(const String8& str) 680{ 681 status_t err = writeInt32(str.bytes()); 682 // only write string if its length is more than zero characters, 683 // as readString8 will only read if the length field is non-zero. 684 // this is slightly different from how writeString16 works. 685 if (str.bytes() > 0 && err == NO_ERROR) { 686 err = write(str.string(), str.bytes()+1); 687 } 688 return err; 689} 690 691status_t Parcel::writeString16(const String16& str) 692{ 693 return writeString16(str.string(), str.size()); 694} 695 696status_t Parcel::writeString16(const char16_t* str, size_t len) 697{ 698 if (str == NULL) return writeInt32(-1); 699 700 status_t err = writeInt32(len); 701 if (err == NO_ERROR) { 702 len *= sizeof(char16_t); 703 uint8_t* data = (uint8_t*)writeInplace(len+sizeof(char16_t)); 704 if (data) { 705 memcpy(data, str, len); 706 *reinterpret_cast<char16_t*>(data+len) = 0; 707 return NO_ERROR; 708 } 709 err = mError; 710 } 711 return err; 712} 713 714status_t Parcel::writeStrongBinder(const sp<IBinder>& val) 715{ 716 return flatten_binder(ProcessState::self(), val, this); 717} 718 719status_t Parcel::writeWeakBinder(const wp<IBinder>& val) 720{ 721 return flatten_binder(ProcessState::self(), val, this); 722} 723 724status_t Parcel::writeNativeHandle(const native_handle* handle) 725{ 726 if (!handle || handle->version != sizeof(native_handle)) 727 return BAD_TYPE; 728 729 status_t err; 730 err = writeInt32(handle->numFds); 731 if (err != NO_ERROR) return err; 732 733 err = writeInt32(handle->numInts); 734 if (err != NO_ERROR) return err; 735 736 for (int i=0 ; err==NO_ERROR && i<handle->numFds ; i++) 737 err = writeDupFileDescriptor(handle->data[i]); 738 739 if (err != NO_ERROR) { 740 ALOGD("write native handle, write dup fd failed"); 741 return err; 742 } 743 err = write(handle->data + handle->numFds, sizeof(int)*handle->numInts); 744 return err; 745} 746 747status_t Parcel::writeFileDescriptor(int fd, bool takeOwnership) 748{ 749 flat_binder_object obj; 750 obj.type = BINDER_TYPE_FD; 751 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 752 obj.handle = fd; 753 obj.cookie = takeOwnership ? 1 : 0; 754 return writeObject(obj, true); 755} 756 757status_t Parcel::writeDupFileDescriptor(int fd) 758{ 759 int dupFd = dup(fd); 760 if (dupFd < 0) { 761 return -errno; 762 } 763 status_t err = writeFileDescriptor(dupFd, true /*takeOwnership*/); 764 if (err) { 765 close(dupFd); 766 } 767 return err; 768} 769 770status_t Parcel::writeBlob(size_t len, WritableBlob* outBlob) 771{ 772 status_t status; 773 774 if (!mAllowFds || len <= IN_PLACE_BLOB_LIMIT) { 775 ALOGV("writeBlob: write in place"); 776 status = writeInt32(0); 777 if (status) return status; 778 779 void* ptr = writeInplace(len); 780 if (!ptr) return NO_MEMORY; 781 782 outBlob->init(false /*mapped*/, ptr, len); 783 return NO_ERROR; 784 } 785 786 ALOGV("writeBlob: write to ashmem"); 787 int fd = ashmem_create_region("Parcel Blob", len); 788 if (fd < 0) return NO_MEMORY; 789 790 int result = ashmem_set_prot_region(fd, PROT_READ | PROT_WRITE); 791 if (result < 0) { 792 status = result; 793 } else { 794 void* ptr = ::mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); 795 if (ptr == MAP_FAILED) { 796 status = -errno; 797 } else { 798 result = ashmem_set_prot_region(fd, PROT_READ); 799 if (result < 0) { 800 status = result; 801 } else { 802 status = writeInt32(1); 803 if (!status) { 804 status = writeFileDescriptor(fd, true /*takeOwnership*/); 805 if (!status) { 806 outBlob->init(true /*mapped*/, ptr, len); 807 return NO_ERROR; 808 } 809 } 810 } 811 } 812 ::munmap(ptr, len); 813 } 814 ::close(fd); 815 return status; 816} 817 818status_t Parcel::write(const FlattenableHelperInterface& val) 819{ 820 status_t err; 821 822 // size if needed 823 const size_t len = val.getFlattenedSize(); 824 const size_t fd_count = val.getFdCount(); 825 826 err = this->writeInt32(len); 827 if (err) return err; 828 829 err = this->writeInt32(fd_count); 830 if (err) return err; 831 832 // payload 833 void* const buf = this->writeInplace(PAD_SIZE(len)); 834 if (buf == NULL) 835 return BAD_VALUE; 836 837 int* fds = NULL; 838 if (fd_count) { 839 fds = new int[fd_count]; 840 } 841 842 err = val.flatten(buf, len, fds, fd_count); 843 for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) { 844 err = this->writeDupFileDescriptor( fds[i] ); 845 } 846 847 if (fd_count) { 848 delete [] fds; 849 } 850 851 return err; 852} 853 854status_t Parcel::writeObject(const flat_binder_object& val, bool nullMetaData) 855{ 856 const bool enoughData = (mDataPos+sizeof(val)) <= mDataCapacity; 857 const bool enoughObjects = mObjectsSize < mObjectsCapacity; 858 if (enoughData && enoughObjects) { 859restart_write: 860 *reinterpret_cast<flat_binder_object*>(mData+mDataPos) = val; 861 862 // Need to write meta-data? 863 if (nullMetaData || val.binder != 0) { 864 mObjects[mObjectsSize] = mDataPos; 865 acquire_object(ProcessState::self(), val, this); 866 mObjectsSize++; 867 } 868 869 // remember if it's a file descriptor 870 if (val.type == BINDER_TYPE_FD) { 871 if (!mAllowFds) { 872 return FDS_NOT_ALLOWED; 873 } 874 mHasFds = mFdsKnown = true; 875 } 876 877 return finishWrite(sizeof(flat_binder_object)); 878 } 879 880 if (!enoughData) { 881 const status_t err = growData(sizeof(val)); 882 if (err != NO_ERROR) return err; 883 } 884 if (!enoughObjects) { 885 size_t newSize = ((mObjectsSize+2)*3)/2; 886 binder_size_t* objects = (binder_size_t*)realloc(mObjects, newSize*sizeof(binder_size_t)); 887 if (objects == NULL) return NO_MEMORY; 888 mObjects = objects; 889 mObjectsCapacity = newSize; 890 } 891 892 goto restart_write; 893} 894 895status_t Parcel::writeNoException() 896{ 897 return writeInt32(0); 898} 899 900void Parcel::remove(size_t /*start*/, size_t /*amt*/) 901{ 902 LOG_ALWAYS_FATAL("Parcel::remove() not yet implemented!"); 903} 904 905status_t Parcel::read(void* outData, size_t len) const 906{ 907 if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize) { 908 memcpy(outData, mData+mDataPos, len); 909 mDataPos += PAD_SIZE(len); 910 ALOGV("read Setting data pos of %p to %d\n", this, mDataPos); 911 return NO_ERROR; 912 } 913 return NOT_ENOUGH_DATA; 914} 915 916const void* Parcel::readInplace(size_t len) const 917{ 918 if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize) { 919 const void* data = mData+mDataPos; 920 mDataPos += PAD_SIZE(len); 921 ALOGV("readInplace Setting data pos of %p to %d\n", this, mDataPos); 922 return data; 923 } 924 return NULL; 925} 926 927template<class T> 928status_t Parcel::readAligned(T *pArg) const { 929 COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T)); 930 931 if ((mDataPos+sizeof(T)) <= mDataSize) { 932 const void* data = mData+mDataPos; 933 mDataPos += sizeof(T); 934 *pArg = *reinterpret_cast<const T*>(data); 935 return NO_ERROR; 936 } else { 937 return NOT_ENOUGH_DATA; 938 } 939} 940 941template<class T> 942T Parcel::readAligned() const { 943 T result; 944 if (readAligned(&result) != NO_ERROR) { 945 result = 0; 946 } 947 948 return result; 949} 950 951template<class T> 952status_t Parcel::writeAligned(T val) { 953 COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T)); 954 955 if ((mDataPos+sizeof(val)) <= mDataCapacity) { 956restart_write: 957 *reinterpret_cast<T*>(mData+mDataPos) = val; 958 return finishWrite(sizeof(val)); 959 } 960 961 status_t err = growData(sizeof(val)); 962 if (err == NO_ERROR) goto restart_write; 963 return err; 964} 965 966status_t Parcel::readInt32(int32_t *pArg) const 967{ 968 return readAligned(pArg); 969} 970 971int32_t Parcel::readInt32() const 972{ 973 return readAligned<int32_t>(); 974} 975 976 977status_t Parcel::readInt64(int64_t *pArg) const 978{ 979 return readAligned(pArg); 980} 981 982 983int64_t Parcel::readInt64() const 984{ 985 return readAligned<int64_t>(); 986} 987 988status_t Parcel::readPointer(uintptr_t *pArg) const 989{ 990 status_t ret; 991 binder_uintptr_t ptr; 992 ret = readAligned(&ptr); 993 if (!ret) 994 *pArg = ptr; 995 return ret; 996} 997 998uintptr_t Parcel::readPointer() const 999{ 1000 return readAligned<binder_uintptr_t>(); 1001} 1002 1003 1004status_t Parcel::readFloat(float *pArg) const 1005{ 1006 return readAligned(pArg); 1007} 1008 1009 1010float Parcel::readFloat() const 1011{ 1012 return readAligned<float>(); 1013} 1014 1015#if defined(__mips__) && defined(__mips_hard_float) 1016 1017status_t Parcel::readDouble(double *pArg) const 1018{ 1019 union { 1020 double d; 1021 unsigned long long ll; 1022 } u; 1023 status_t status; 1024 status = readAligned(&u.ll); 1025 *pArg = u.d; 1026 return status; 1027} 1028 1029double Parcel::readDouble() const 1030{ 1031 union { 1032 double d; 1033 unsigned long long ll; 1034 } u; 1035 u.ll = readAligned<unsigned long long>(); 1036 return u.d; 1037} 1038 1039#else 1040 1041status_t Parcel::readDouble(double *pArg) const 1042{ 1043 return readAligned(pArg); 1044} 1045 1046double Parcel::readDouble() const 1047{ 1048 return readAligned<double>(); 1049} 1050 1051#endif 1052 1053status_t Parcel::readIntPtr(intptr_t *pArg) const 1054{ 1055 return readAligned(pArg); 1056} 1057 1058 1059intptr_t Parcel::readIntPtr() const 1060{ 1061 return readAligned<intptr_t>(); 1062} 1063 1064 1065const char* Parcel::readCString() const 1066{ 1067 const size_t avail = mDataSize-mDataPos; 1068 if (avail > 0) { 1069 const char* str = reinterpret_cast<const char*>(mData+mDataPos); 1070 // is the string's trailing NUL within the parcel's valid bounds? 1071 const char* eos = reinterpret_cast<const char*>(memchr(str, 0, avail)); 1072 if (eos) { 1073 const size_t len = eos - str; 1074 mDataPos += PAD_SIZE(len+1); 1075 ALOGV("readCString Setting data pos of %p to %d\n", this, mDataPos); 1076 return str; 1077 } 1078 } 1079 return NULL; 1080} 1081 1082String8 Parcel::readString8() const 1083{ 1084 int32_t size = readInt32(); 1085 // watch for potential int overflow adding 1 for trailing NUL 1086 if (size > 0 && size < INT32_MAX) { 1087 const char* str = (const char*)readInplace(size+1); 1088 if (str) return String8(str, size); 1089 } 1090 return String8(); 1091} 1092 1093String16 Parcel::readString16() const 1094{ 1095 size_t len; 1096 const char16_t* str = readString16Inplace(&len); 1097 if (str) return String16(str, len); 1098 ALOGE("Reading a NULL string not supported here."); 1099 return String16(); 1100} 1101 1102const char16_t* Parcel::readString16Inplace(size_t* outLen) const 1103{ 1104 int32_t size = readInt32(); 1105 // watch for potential int overflow from size+1 1106 if (size >= 0 && size < INT32_MAX) { 1107 *outLen = size; 1108 const char16_t* str = (const char16_t*)readInplace((size+1)*sizeof(char16_t)); 1109 if (str != NULL) { 1110 return str; 1111 } 1112 } 1113 *outLen = 0; 1114 return NULL; 1115} 1116 1117sp<IBinder> Parcel::readStrongBinder() const 1118{ 1119 sp<IBinder> val; 1120 unflatten_binder(ProcessState::self(), *this, &val); 1121 return val; 1122} 1123 1124wp<IBinder> Parcel::readWeakBinder() const 1125{ 1126 wp<IBinder> val; 1127 unflatten_binder(ProcessState::self(), *this, &val); 1128 return val; 1129} 1130 1131int32_t Parcel::readExceptionCode() const 1132{ 1133 int32_t exception_code = readAligned<int32_t>(); 1134 if (exception_code == EX_HAS_REPLY_HEADER) { 1135 int32_t header_start = dataPosition(); 1136 int32_t header_size = readAligned<int32_t>(); 1137 // Skip over fat responses headers. Not used (or propagated) in 1138 // native code 1139 setDataPosition(header_start + header_size); 1140 // And fat response headers are currently only used when there are no 1141 // exceptions, so return no error: 1142 return 0; 1143 } 1144 return exception_code; 1145} 1146 1147native_handle* Parcel::readNativeHandle() const 1148{ 1149 int numFds, numInts; 1150 status_t err; 1151 err = readInt32(&numFds); 1152 if (err != NO_ERROR) return 0; 1153 err = readInt32(&numInts); 1154 if (err != NO_ERROR) return 0; 1155 1156 native_handle* h = native_handle_create(numFds, numInts); 1157 for (int i=0 ; err==NO_ERROR && i<numFds ; i++) { 1158 h->data[i] = dup(readFileDescriptor()); 1159 if (h->data[i] < 0) err = BAD_VALUE; 1160 } 1161 err = read(h->data + numFds, sizeof(int)*numInts); 1162 if (err != NO_ERROR) { 1163 native_handle_close(h); 1164 native_handle_delete(h); 1165 h = 0; 1166 } 1167 return h; 1168} 1169 1170 1171int Parcel::readFileDescriptor() const 1172{ 1173 const flat_binder_object* flat = readObject(true); 1174 if (flat) { 1175 switch (flat->type) { 1176 case BINDER_TYPE_FD: 1177 //ALOGI("Returning file descriptor %ld from parcel %p\n", flat->handle, this); 1178 return flat->handle; 1179 } 1180 } 1181 return BAD_TYPE; 1182} 1183 1184status_t Parcel::readBlob(size_t len, ReadableBlob* outBlob) const 1185{ 1186 int32_t useAshmem; 1187 status_t status = readInt32(&useAshmem); 1188 if (status) return status; 1189 1190 if (!useAshmem) { 1191 ALOGV("readBlob: read in place"); 1192 const void* ptr = readInplace(len); 1193 if (!ptr) return BAD_VALUE; 1194 1195 outBlob->init(false /*mapped*/, const_cast<void*>(ptr), len); 1196 return NO_ERROR; 1197 } 1198 1199 ALOGV("readBlob: read from ashmem"); 1200 int fd = readFileDescriptor(); 1201 if (fd == int(BAD_TYPE)) return BAD_VALUE; 1202 1203 void* ptr = ::mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0); 1204 if (!ptr) return NO_MEMORY; 1205 1206 outBlob->init(true /*mapped*/, ptr, len); 1207 return NO_ERROR; 1208} 1209 1210status_t Parcel::read(FlattenableHelperInterface& val) const 1211{ 1212 // size 1213 const size_t len = this->readInt32(); 1214 const size_t fd_count = this->readInt32(); 1215 1216 // payload 1217 void const* const buf = this->readInplace(PAD_SIZE(len)); 1218 if (buf == NULL) 1219 return BAD_VALUE; 1220 1221 int* fds = NULL; 1222 if (fd_count) { 1223 fds = new int[fd_count]; 1224 } 1225 1226 status_t err = NO_ERROR; 1227 for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) { 1228 fds[i] = dup(this->readFileDescriptor()); 1229 if (fds[i] < 0) err = BAD_VALUE; 1230 } 1231 1232 if (err == NO_ERROR) { 1233 err = val.unflatten(buf, len, fds, fd_count); 1234 } 1235 1236 if (fd_count) { 1237 delete [] fds; 1238 } 1239 1240 return err; 1241} 1242const flat_binder_object* Parcel::readObject(bool nullMetaData) const 1243{ 1244 const size_t DPOS = mDataPos; 1245 if ((DPOS+sizeof(flat_binder_object)) <= mDataSize) { 1246 const flat_binder_object* obj 1247 = reinterpret_cast<const flat_binder_object*>(mData+DPOS); 1248 mDataPos = DPOS + sizeof(flat_binder_object); 1249 if (!nullMetaData && (obj->cookie == 0 && obj->binder == 0)) { 1250 // When transferring a NULL object, we don't write it into 1251 // the object list, so we don't want to check for it when 1252 // reading. 1253 ALOGV("readObject Setting data pos of %p to %d\n", this, mDataPos); 1254 return obj; 1255 } 1256 1257 // Ensure that this object is valid... 1258 binder_size_t* const OBJS = mObjects; 1259 const size_t N = mObjectsSize; 1260 size_t opos = mNextObjectHint; 1261 1262 if (N > 0) { 1263 ALOGV("Parcel %p looking for obj at %d, hint=%d\n", 1264 this, DPOS, opos); 1265 1266 // Start at the current hint position, looking for an object at 1267 // the current data position. 1268 if (opos < N) { 1269 while (opos < (N-1) && OBJS[opos] < DPOS) { 1270 opos++; 1271 } 1272 } else { 1273 opos = N-1; 1274 } 1275 if (OBJS[opos] == DPOS) { 1276 // Found it! 1277 ALOGV("Parcel found obj %d at index %d with forward search", 1278 this, DPOS, opos); 1279 mNextObjectHint = opos+1; 1280 ALOGV("readObject Setting data pos of %p to %d\n", this, mDataPos); 1281 return obj; 1282 } 1283 1284 // Look backwards for it... 1285 while (opos > 0 && OBJS[opos] > DPOS) { 1286 opos--; 1287 } 1288 if (OBJS[opos] == DPOS) { 1289 // Found it! 1290 ALOGV("Parcel found obj %d at index %d with backward search", 1291 this, DPOS, opos); 1292 mNextObjectHint = opos+1; 1293 ALOGV("readObject Setting data pos of %p to %d\n", this, mDataPos); 1294 return obj; 1295 } 1296 } 1297 ALOGW("Attempt to read object from Parcel %p at offset %zu that is not in the object list", 1298 this, DPOS); 1299 } 1300 return NULL; 1301} 1302 1303void Parcel::closeFileDescriptors() 1304{ 1305 size_t i = mObjectsSize; 1306 if (i > 0) { 1307 //ALOGI("Closing file descriptors for %d objects...", mObjectsSize); 1308 } 1309 while (i > 0) { 1310 i--; 1311 const flat_binder_object* flat 1312 = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]); 1313 if (flat->type == BINDER_TYPE_FD) { 1314 //ALOGI("Closing fd: %ld\n", flat->handle); 1315 close(flat->handle); 1316 } 1317 } 1318} 1319 1320uintptr_t Parcel::ipcData() const 1321{ 1322 return reinterpret_cast<uintptr_t>(mData); 1323} 1324 1325size_t Parcel::ipcDataSize() const 1326{ 1327 return (mDataSize > mDataPos ? mDataSize : mDataPos); 1328} 1329 1330uintptr_t Parcel::ipcObjects() const 1331{ 1332 return reinterpret_cast<uintptr_t>(mObjects); 1333} 1334 1335size_t Parcel::ipcObjectsCount() const 1336{ 1337 return mObjectsSize; 1338} 1339 1340void Parcel::ipcSetDataReference(const uint8_t* data, size_t dataSize, 1341 const binder_size_t* objects, size_t objectsCount, release_func relFunc, void* relCookie) 1342{ 1343 size_t minOffset = 0; 1344 freeDataNoInit(); 1345 mError = NO_ERROR; 1346 mData = const_cast<uint8_t*>(data); 1347 mDataSize = mDataCapacity = dataSize; 1348 //ALOGI("setDataReference Setting data size of %p to %lu (pid=%d)\n", this, mDataSize, getpid()); 1349 mDataPos = 0; 1350 ALOGV("setDataReference Setting data pos of %p to %d\n", this, mDataPos); 1351 mObjects = const_cast<binder_size_t*>(objects); 1352 mObjectsSize = mObjectsCapacity = objectsCount; 1353 mNextObjectHint = 0; 1354 mOwner = relFunc; 1355 mOwnerCookie = relCookie; 1356 for (size_t i = 0; i < mObjectsSize; i++) { 1357 size_t offset = mObjects[i]; 1358 if (offset < minOffset) { 1359 ALOGE("%s: bad object offset %zu < %zu\n", 1360 __func__, offset, minOffset); 1361 mObjectsSize = 0; 1362 break; 1363 } 1364 minOffset = offset + sizeof(flat_binder_object); 1365 } 1366 scanForFds(); 1367} 1368 1369void Parcel::print(TextOutput& to, uint32_t /*flags*/) const 1370{ 1371 to << "Parcel("; 1372 1373 if (errorCheck() != NO_ERROR) { 1374 const status_t err = errorCheck(); 1375 to << "Error: " << (void*)(intptr_t)err << " \"" << strerror(-err) << "\""; 1376 } else if (dataSize() > 0) { 1377 const uint8_t* DATA = data(); 1378 to << indent << HexDump(DATA, dataSize()) << dedent; 1379 const binder_size_t* OBJS = objects(); 1380 const size_t N = objectsCount(); 1381 for (size_t i=0; i<N; i++) { 1382 const flat_binder_object* flat 1383 = reinterpret_cast<const flat_binder_object*>(DATA+OBJS[i]); 1384 to << endl << "Object #" << i << " @ " << (void*)OBJS[i] << ": " 1385 << TypeCode(flat->type & 0x7f7f7f00) 1386 << " = " << flat->binder; 1387 } 1388 } else { 1389 to << "NULL"; 1390 } 1391 1392 to << ")"; 1393} 1394 1395void Parcel::releaseObjects() 1396{ 1397 const sp<ProcessState> proc(ProcessState::self()); 1398 size_t i = mObjectsSize; 1399 uint8_t* const data = mData; 1400 binder_size_t* const objects = mObjects; 1401 while (i > 0) { 1402 i--; 1403 const flat_binder_object* flat 1404 = reinterpret_cast<flat_binder_object*>(data+objects[i]); 1405 release_object(proc, *flat, this); 1406 } 1407} 1408 1409void Parcel::acquireObjects() 1410{ 1411 const sp<ProcessState> proc(ProcessState::self()); 1412 size_t i = mObjectsSize; 1413 uint8_t* const data = mData; 1414 binder_size_t* const objects = mObjects; 1415 while (i > 0) { 1416 i--; 1417 const flat_binder_object* flat 1418 = reinterpret_cast<flat_binder_object*>(data+objects[i]); 1419 acquire_object(proc, *flat, this); 1420 } 1421} 1422 1423void Parcel::freeData() 1424{ 1425 freeDataNoInit(); 1426 initState(); 1427} 1428 1429void Parcel::freeDataNoInit() 1430{ 1431 if (mOwner) { 1432 //ALOGI("Freeing data ref of %p (pid=%d)\n", this, getpid()); 1433 mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie); 1434 } else { 1435 releaseObjects(); 1436 if (mData) free(mData); 1437 if (mObjects) free(mObjects); 1438 } 1439} 1440 1441status_t Parcel::growData(size_t len) 1442{ 1443 size_t newSize = ((mDataSize+len)*3)/2; 1444 return (newSize <= mDataSize) 1445 ? (status_t) NO_MEMORY 1446 : continueWrite(newSize); 1447} 1448 1449status_t Parcel::restartWrite(size_t desired) 1450{ 1451 if (mOwner) { 1452 freeData(); 1453 return continueWrite(desired); 1454 } 1455 1456 uint8_t* data = (uint8_t*)realloc(mData, desired); 1457 if (!data && desired > mDataCapacity) { 1458 mError = NO_MEMORY; 1459 return NO_MEMORY; 1460 } 1461 1462 releaseObjects(); 1463 1464 if (data) { 1465 mData = data; 1466 mDataCapacity = desired; 1467 } 1468 1469 mDataSize = mDataPos = 0; 1470 ALOGV("restartWrite Setting data size of %p to %d\n", this, mDataSize); 1471 ALOGV("restartWrite Setting data pos of %p to %d\n", this, mDataPos); 1472 1473 free(mObjects); 1474 mObjects = NULL; 1475 mObjectsSize = mObjectsCapacity = 0; 1476 mNextObjectHint = 0; 1477 mHasFds = false; 1478 mFdsKnown = true; 1479 mAllowFds = true; 1480 1481 return NO_ERROR; 1482} 1483 1484status_t Parcel::continueWrite(size_t desired) 1485{ 1486 // If shrinking, first adjust for any objects that appear 1487 // after the new data size. 1488 size_t objectsSize = mObjectsSize; 1489 if (desired < mDataSize) { 1490 if (desired == 0) { 1491 objectsSize = 0; 1492 } else { 1493 while (objectsSize > 0) { 1494 if (mObjects[objectsSize-1] < desired) 1495 break; 1496 objectsSize--; 1497 } 1498 } 1499 } 1500 1501 if (mOwner) { 1502 // If the size is going to zero, just release the owner's data. 1503 if (desired == 0) { 1504 freeData(); 1505 return NO_ERROR; 1506 } 1507 1508 // If there is a different owner, we need to take 1509 // posession. 1510 uint8_t* data = (uint8_t*)malloc(desired); 1511 if (!data) { 1512 mError = NO_MEMORY; 1513 return NO_MEMORY; 1514 } 1515 binder_size_t* objects = NULL; 1516 1517 if (objectsSize) { 1518 objects = (binder_size_t*)malloc(objectsSize*sizeof(binder_size_t)); 1519 if (!objects) { 1520 free(data); 1521 1522 mError = NO_MEMORY; 1523 return NO_MEMORY; 1524 } 1525 1526 // Little hack to only acquire references on objects 1527 // we will be keeping. 1528 size_t oldObjectsSize = mObjectsSize; 1529 mObjectsSize = objectsSize; 1530 acquireObjects(); 1531 mObjectsSize = oldObjectsSize; 1532 } 1533 1534 if (mData) { 1535 memcpy(data, mData, mDataSize < desired ? mDataSize : desired); 1536 } 1537 if (objects && mObjects) { 1538 memcpy(objects, mObjects, objectsSize*sizeof(binder_size_t)); 1539 } 1540 //ALOGI("Freeing data ref of %p (pid=%d)\n", this, getpid()); 1541 mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie); 1542 mOwner = NULL; 1543 1544 mData = data; 1545 mObjects = objects; 1546 mDataSize = (mDataSize < desired) ? mDataSize : desired; 1547 ALOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize); 1548 mDataCapacity = desired; 1549 mObjectsSize = mObjectsCapacity = objectsSize; 1550 mNextObjectHint = 0; 1551 1552 } else if (mData) { 1553 if (objectsSize < mObjectsSize) { 1554 // Need to release refs on any objects we are dropping. 1555 const sp<ProcessState> proc(ProcessState::self()); 1556 for (size_t i=objectsSize; i<mObjectsSize; i++) { 1557 const flat_binder_object* flat 1558 = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]); 1559 if (flat->type == BINDER_TYPE_FD) { 1560 // will need to rescan because we may have lopped off the only FDs 1561 mFdsKnown = false; 1562 } 1563 release_object(proc, *flat, this); 1564 } 1565 binder_size_t* objects = 1566 (binder_size_t*)realloc(mObjects, objectsSize*sizeof(binder_size_t)); 1567 if (objects) { 1568 mObjects = objects; 1569 } 1570 mObjectsSize = objectsSize; 1571 mNextObjectHint = 0; 1572 } 1573 1574 // We own the data, so we can just do a realloc(). 1575 if (desired > mDataCapacity) { 1576 uint8_t* data = (uint8_t*)realloc(mData, desired); 1577 if (data) { 1578 mData = data; 1579 mDataCapacity = desired; 1580 } else if (desired > mDataCapacity) { 1581 mError = NO_MEMORY; 1582 return NO_MEMORY; 1583 } 1584 } else { 1585 if (mDataSize > desired) { 1586 mDataSize = desired; 1587 ALOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize); 1588 } 1589 if (mDataPos > desired) { 1590 mDataPos = desired; 1591 ALOGV("continueWrite Setting data pos of %p to %d\n", this, mDataPos); 1592 } 1593 } 1594 1595 } else { 1596 // This is the first data. Easy! 1597 uint8_t* data = (uint8_t*)malloc(desired); 1598 if (!data) { 1599 mError = NO_MEMORY; 1600 return NO_MEMORY; 1601 } 1602 1603 if(!(mDataCapacity == 0 && mObjects == NULL 1604 && mObjectsCapacity == 0)) { 1605 ALOGE("continueWrite: %zu/%p/%zu/%zu", mDataCapacity, mObjects, mObjectsCapacity, desired); 1606 } 1607 1608 mData = data; 1609 mDataSize = mDataPos = 0; 1610 ALOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize); 1611 ALOGV("continueWrite Setting data pos of %p to %d\n", this, mDataPos); 1612 mDataCapacity = desired; 1613 } 1614 1615 return NO_ERROR; 1616} 1617 1618void Parcel::initState() 1619{ 1620 mError = NO_ERROR; 1621 mData = 0; 1622 mDataSize = 0; 1623 mDataCapacity = 0; 1624 mDataPos = 0; 1625 ALOGV("initState Setting data size of %p to %d\n", this, mDataSize); 1626 ALOGV("initState Setting data pos of %p to %d\n", this, mDataPos); 1627 mObjects = NULL; 1628 mObjectsSize = 0; 1629 mObjectsCapacity = 0; 1630 mNextObjectHint = 0; 1631 mHasFds = false; 1632 mFdsKnown = true; 1633 mAllowFds = true; 1634 mOwner = NULL; 1635} 1636 1637void Parcel::scanForFds() const 1638{ 1639 bool hasFds = false; 1640 for (size_t i=0; i<mObjectsSize; i++) { 1641 const flat_binder_object* flat 1642 = reinterpret_cast<const flat_binder_object*>(mData + mObjects[i]); 1643 if (flat->type == BINDER_TYPE_FD) { 1644 hasFds = true; 1645 break; 1646 } 1647 } 1648 mHasFds = hasFds; 1649 mFdsKnown = true; 1650} 1651 1652// --- Parcel::Blob --- 1653 1654Parcel::Blob::Blob() : 1655 mMapped(false), mData(NULL), mSize(0) { 1656} 1657 1658Parcel::Blob::~Blob() { 1659 release(); 1660} 1661 1662void Parcel::Blob::release() { 1663 if (mMapped && mData) { 1664 ::munmap(mData, mSize); 1665 } 1666 clear(); 1667} 1668 1669void Parcel::Blob::init(bool mapped, void* data, size_t size) { 1670 mMapped = mapped; 1671 mData = data; 1672 mSize = size; 1673} 1674 1675void Parcel::Blob::clear() { 1676 mMapped = false; 1677 mData = NULL; 1678 mSize = 0; 1679} 1680 1681}; // namespace android 1682