Parcel.cpp revision 07fd0f195db6d341cab4e54257f508d802c98832
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 <stdio.h> 39#include <stdlib.h> 40#include <stdint.h> 41#include <sys/mman.h> 42 43#ifndef INT32_MAX 44#define INT32_MAX ((int32_t)(2147483647)) 45#endif 46 47#define LOG_REFS(...) 48//#define LOG_REFS(...) ALOG(LOG_DEBUG, "Parcel", __VA_ARGS__) 49 50// --------------------------------------------------------------------------- 51 52#define PAD_SIZE(s) (((s)+3)&~3) 53 54// Note: must be kept in sync with android/os/StrictMode.java's PENALTY_GATHER 55#define STRICT_MODE_PENALTY_GATHER 0x100 56 57// Note: must be kept in sync with android/os/Parcel.java's EX_HAS_REPLY_HEADER 58#define EX_HAS_REPLY_HEADER -128 59 60// Maximum size of a blob to transfer in-place. 61static const size_t IN_PLACE_BLOB_LIMIT = 40 * 1024; 62 63// XXX This can be made public if we want to provide 64// support for typed data. 65struct small_flat_data 66{ 67 uint32_t type; 68 uint32_t data; 69}; 70 71namespace android { 72 73void acquire_object(const sp<ProcessState>& proc, 74 const flat_binder_object& obj, const void* who) 75{ 76 switch (obj.type) { 77 case BINDER_TYPE_BINDER: 78 if (obj.binder) { 79 LOG_REFS("Parcel %p acquiring reference on local %p", who, obj.cookie); 80 reinterpret_cast<IBinder*>(obj.cookie)->incStrong(who); 81 } 82 return; 83 case BINDER_TYPE_WEAK_BINDER: 84 if (obj.binder) 85 reinterpret_cast<RefBase::weakref_type*>(obj.binder)->incWeak(who); 86 return; 87 case BINDER_TYPE_HANDLE: { 88 const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle); 89 if (b != NULL) { 90 LOG_REFS("Parcel %p acquiring reference on remote %p", who, b.get()); 91 b->incStrong(who); 92 } 93 return; 94 } 95 case BINDER_TYPE_WEAK_HANDLE: { 96 const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle); 97 if (b != NULL) b.get_refs()->incWeak(who); 98 return; 99 } 100 case BINDER_TYPE_FD: { 101 // intentionally blank -- nothing to do to acquire this, but we do 102 // recognize it as a legitimate object type. 103 return; 104 } 105 } 106 107 ALOGD("Invalid object type 0x%08x", obj.type); 108} 109 110void release_object(const sp<ProcessState>& proc, 111 const flat_binder_object& obj, const void* who) 112{ 113 switch (obj.type) { 114 case BINDER_TYPE_BINDER: 115 if (obj.binder) { 116 LOG_REFS("Parcel %p releasing reference on local %p", who, obj.cookie); 117 reinterpret_cast<IBinder*>(obj.cookie)->decStrong(who); 118 } 119 return; 120 case BINDER_TYPE_WEAK_BINDER: 121 if (obj.binder) 122 reinterpret_cast<RefBase::weakref_type*>(obj.binder)->decWeak(who); 123 return; 124 case BINDER_TYPE_HANDLE: { 125 const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle); 126 if (b != NULL) { 127 LOG_REFS("Parcel %p releasing reference on remote %p", who, b.get()); 128 b->decStrong(who); 129 } 130 return; 131 } 132 case BINDER_TYPE_WEAK_HANDLE: { 133 const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle); 134 if (b != NULL) b.get_refs()->decWeak(who); 135 return; 136 } 137 case BINDER_TYPE_FD: { 138 if (obj.cookie != 0) close(obj.handle); 139 return; 140 } 141 } 142 143 ALOGE("Invalid object type 0x%08x", obj.type); 144} 145 146inline static status_t finish_flatten_binder( 147 const sp<IBinder>& /*binder*/, const flat_binder_object& flat, Parcel* out) 148{ 149 return out->writeObject(flat, false); 150} 151 152status_t flatten_binder(const sp<ProcessState>& /*proc*/, 153 const sp<IBinder>& binder, Parcel* out) 154{ 155 flat_binder_object obj; 156 157 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 158 if (binder != NULL) { 159 IBinder *local = binder->localBinder(); 160 if (!local) { 161 BpBinder *proxy = binder->remoteBinder(); 162 if (proxy == NULL) { 163 ALOGE("null proxy"); 164 } 165 const int32_t handle = proxy ? proxy->handle() : 0; 166 obj.type = BINDER_TYPE_HANDLE; 167 obj.binder = 0; /* Don't pass uninitialized stack data to a remote process */ 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.binder = 0; /* Don't pass uninitialized stack data to a remote process */ 202 obj.handle = handle; 203 obj.cookie = 0; 204 } else { 205 obj.type = BINDER_TYPE_WEAK_BINDER; 206 obj.binder = reinterpret_cast<uintptr_t>(binder.get_refs()); 207 obj.cookie = reinterpret_cast<uintptr_t>(binder.unsafe_get()); 208 } 209 return finish_flatten_binder(real, obj, out); 210 } 211 212 // XXX How to deal? In order to flatten the given binder, 213 // we need to probe it for information, which requires a primary 214 // reference... but we don't have one. 215 // 216 // The OpenBinder implementation uses a dynamic_cast<> here, 217 // but we can't do that with the different reference counting 218 // implementation we are using. 219 ALOGE("Unable to unflatten Binder weak reference!"); 220 obj.type = BINDER_TYPE_BINDER; 221 obj.binder = 0; 222 obj.cookie = 0; 223 return finish_flatten_binder(NULL, obj, out); 224 225 } else { 226 obj.type = BINDER_TYPE_BINDER; 227 obj.binder = 0; 228 obj.cookie = 0; 229 return finish_flatten_binder(NULL, obj, out); 230 } 231} 232 233inline static status_t finish_unflatten_binder( 234 BpBinder* /*proxy*/, const flat_binder_object& /*flat*/, 235 const Parcel& /*in*/) 236{ 237 return NO_ERROR; 238} 239 240status_t unflatten_binder(const sp<ProcessState>& proc, 241 const Parcel& in, sp<IBinder>* out) 242{ 243 const flat_binder_object* flat = in.readObject(false); 244 245 if (flat) { 246 switch (flat->type) { 247 case BINDER_TYPE_BINDER: 248 *out = reinterpret_cast<IBinder*>(flat->cookie); 249 return finish_unflatten_binder(NULL, *flat, in); 250 case BINDER_TYPE_HANDLE: 251 *out = proc->getStrongProxyForHandle(flat->handle); 252 return finish_unflatten_binder( 253 static_cast<BpBinder*>(out->get()), *flat, in); 254 } 255 } 256 return BAD_TYPE; 257} 258 259status_t unflatten_binder(const sp<ProcessState>& proc, 260 const Parcel& in, wp<IBinder>* out) 261{ 262 const flat_binder_object* flat = in.readObject(false); 263 264 if (flat) { 265 switch (flat->type) { 266 case BINDER_TYPE_BINDER: 267 *out = reinterpret_cast<IBinder*>(flat->cookie); 268 return finish_unflatten_binder(NULL, *flat, in); 269 case BINDER_TYPE_WEAK_BINDER: 270 if (flat->binder != 0) { 271 out->set_object_and_refs( 272 reinterpret_cast<IBinder*>(flat->cookie), 273 reinterpret_cast<RefBase::weakref_type*>(flat->binder)); 274 } else { 275 *out = NULL; 276 } 277 return finish_unflatten_binder(NULL, *flat, in); 278 case BINDER_TYPE_HANDLE: 279 case BINDER_TYPE_WEAK_HANDLE: 280 *out = proc->getWeakProxyForHandle(flat->handle); 281 return finish_unflatten_binder( 282 static_cast<BpBinder*>(out->unsafe_get()), *flat, in); 283 } 284 } 285 return BAD_TYPE; 286} 287 288// --------------------------------------------------------------------------- 289 290Parcel::Parcel() 291{ 292 initState(); 293} 294 295Parcel::~Parcel() 296{ 297 freeDataNoInit(); 298} 299 300const uint8_t* Parcel::data() const 301{ 302 return mData; 303} 304 305size_t Parcel::dataSize() const 306{ 307 return (mDataSize > mDataPos ? mDataSize : mDataPos); 308} 309 310size_t Parcel::dataAvail() const 311{ 312 // TODO: decide what to do about the possibility that this can 313 // report an available-data size that exceeds a Java int's max 314 // positive value, causing havoc. Fortunately this will only 315 // happen if someone constructs a Parcel containing more than two 316 // gigabytes of data, which on typical phone hardware is simply 317 // not possible. 318 return dataSize() - dataPosition(); 319} 320 321size_t Parcel::dataPosition() const 322{ 323 return mDataPos; 324} 325 326size_t Parcel::dataCapacity() const 327{ 328 return mDataCapacity; 329} 330 331status_t Parcel::setDataSize(size_t size) 332{ 333 status_t err; 334 err = continueWrite(size); 335 if (err == NO_ERROR) { 336 mDataSize = size; 337 ALOGV("setDataSize Setting data size of %p to %d\n", this, mDataSize); 338 } 339 return err; 340} 341 342void Parcel::setDataPosition(size_t pos) const 343{ 344 mDataPos = pos; 345 mNextObjectHint = 0; 346} 347 348status_t Parcel::setDataCapacity(size_t size) 349{ 350 if (size > mDataCapacity) return continueWrite(size); 351 return NO_ERROR; 352} 353 354status_t Parcel::setData(const uint8_t* buffer, size_t len) 355{ 356 status_t err = restartWrite(len); 357 if (err == NO_ERROR) { 358 memcpy(const_cast<uint8_t*>(data()), buffer, len); 359 mDataSize = len; 360 mFdsKnown = false; 361 } 362 return err; 363} 364 365status_t Parcel::appendFrom(const Parcel *parcel, size_t offset, size_t len) 366{ 367 const sp<ProcessState> proc(ProcessState::self()); 368 status_t err; 369 const uint8_t *data = parcel->mData; 370 const binder_size_t *objects = parcel->mObjects; 371 size_t size = parcel->mObjectsSize; 372 int startPos = mDataPos; 373 int firstIndex = -1, lastIndex = -2; 374 375 if (len == 0) { 376 return NO_ERROR; 377 } 378 379 // range checks against the source parcel size 380 if ((offset > parcel->mDataSize) 381 || (len > parcel->mDataSize) 382 || (offset + len > parcel->mDataSize)) { 383 return BAD_VALUE; 384 } 385 386 // Count objects in range 387 for (int i = 0; i < (int) size; i++) { 388 size_t off = objects[i]; 389 if ((off >= offset) && (off < offset + len)) { 390 if (firstIndex == -1) { 391 firstIndex = i; 392 } 393 lastIndex = i; 394 } 395 } 396 int numObjects = lastIndex - firstIndex + 1; 397 398 if ((mDataSize+len) > mDataCapacity) { 399 // grow data 400 err = growData(len); 401 if (err != NO_ERROR) { 402 return err; 403 } 404 } 405 406 // append data 407 memcpy(mData + mDataPos, data + offset, len); 408 mDataPos += len; 409 mDataSize += len; 410 411 err = NO_ERROR; 412 413 if (numObjects > 0) { 414 // grow objects 415 if (mObjectsCapacity < mObjectsSize + numObjects) { 416 int newSize = ((mObjectsSize + numObjects)*3)/2; 417 binder_size_t *objects = 418 (binder_size_t*)realloc(mObjects, newSize*sizeof(binder_size_t)); 419 if (objects == (binder_size_t*)0) { 420 return NO_MEMORY; 421 } 422 mObjects = objects; 423 mObjectsCapacity = newSize; 424 } 425 426 // append and acquire objects 427 int idx = mObjectsSize; 428 for (int i = firstIndex; i <= lastIndex; i++) { 429 size_t off = objects[i] - offset + startPos; 430 mObjects[idx++] = off; 431 mObjectsSize++; 432 433 flat_binder_object* flat 434 = reinterpret_cast<flat_binder_object*>(mData + off); 435 acquire_object(proc, *flat, this); 436 437 if (flat->type == BINDER_TYPE_FD) { 438 // If this is a file descriptor, we need to dup it so the 439 // new Parcel now owns its own fd, and can declare that we 440 // officially know we have fds. 441 flat->handle = dup(flat->handle); 442 flat->cookie = 1; 443 mHasFds = mFdsKnown = true; 444 if (!mAllowFds) { 445 err = FDS_NOT_ALLOWED; 446 } 447 } 448 } 449 } 450 451 return err; 452} 453 454bool Parcel::pushAllowFds(bool allowFds) 455{ 456 const bool origValue = mAllowFds; 457 if (!allowFds) { 458 mAllowFds = false; 459 } 460 return origValue; 461} 462 463void Parcel::restoreAllowFds(bool lastValue) 464{ 465 mAllowFds = lastValue; 466} 467 468bool Parcel::hasFileDescriptors() const 469{ 470 if (!mFdsKnown) { 471 scanForFds(); 472 } 473 return mHasFds; 474} 475 476// Write RPC headers. (previously just the interface token) 477status_t Parcel::writeInterfaceToken(const String16& interface) 478{ 479 writeInt32(IPCThreadState::self()->getStrictModePolicy() | 480 STRICT_MODE_PENALTY_GATHER); 481 // currently the interface identification token is just its name as a string 482 return writeString16(interface); 483} 484 485bool Parcel::checkInterface(IBinder* binder) const 486{ 487 return enforceInterface(binder->getInterfaceDescriptor()); 488} 489 490bool Parcel::enforceInterface(const String16& interface, 491 IPCThreadState* threadState) const 492{ 493 int32_t strictPolicy = readInt32(); 494 if (threadState == NULL) { 495 threadState = IPCThreadState::self(); 496 } 497 if ((threadState->getLastTransactionBinderFlags() & 498 IBinder::FLAG_ONEWAY) != 0) { 499 // For one-way calls, the callee is running entirely 500 // disconnected from the caller, so disable StrictMode entirely. 501 // Not only does disk/network usage not impact the caller, but 502 // there's no way to commuicate back any violations anyway. 503 threadState->setStrictModePolicy(0); 504 } else { 505 threadState->setStrictModePolicy(strictPolicy); 506 } 507 const String16 str(readString16()); 508 if (str == interface) { 509 return true; 510 } else { 511 ALOGW("**** enforceInterface() expected '%s' but read '%s'\n", 512 String8(interface).string(), String8(str).string()); 513 return false; 514 } 515} 516 517const binder_size_t* Parcel::objects() const 518{ 519 return mObjects; 520} 521 522size_t Parcel::objectsCount() const 523{ 524 return mObjectsSize; 525} 526 527status_t Parcel::errorCheck() const 528{ 529 return mError; 530} 531 532void Parcel::setError(status_t err) 533{ 534 mError = err; 535} 536 537status_t Parcel::finishWrite(size_t len) 538{ 539 //printf("Finish write of %d\n", len); 540 mDataPos += len; 541 ALOGV("finishWrite Setting data pos of %p to %d\n", this, mDataPos); 542 if (mDataPos > mDataSize) { 543 mDataSize = mDataPos; 544 ALOGV("finishWrite Setting data size of %p to %d\n", this, mDataSize); 545 } 546 //printf("New pos=%d, size=%d\n", mDataPos, mDataSize); 547 return NO_ERROR; 548} 549 550status_t Parcel::writeUnpadded(const void* data, size_t len) 551{ 552 size_t end = mDataPos + len; 553 if (end < mDataPos) { 554 // integer overflow 555 return BAD_VALUE; 556 } 557 558 if (end <= mDataCapacity) { 559restart_write: 560 memcpy(mData+mDataPos, data, len); 561 return finishWrite(len); 562 } 563 564 status_t err = growData(len); 565 if (err == NO_ERROR) goto restart_write; 566 return err; 567} 568 569status_t Parcel::write(const void* data, size_t len) 570{ 571 void* const d = writeInplace(len); 572 if (d) { 573 memcpy(d, data, len); 574 return NO_ERROR; 575 } 576 return mError; 577} 578 579void* Parcel::writeInplace(size_t len) 580{ 581 const size_t padded = PAD_SIZE(len); 582 583 // sanity check for integer overflow 584 if (mDataPos+padded < mDataPos) { 585 return NULL; 586 } 587 588 if ((mDataPos+padded) <= mDataCapacity) { 589restart_write: 590 //printf("Writing %ld bytes, padded to %ld\n", len, padded); 591 uint8_t* const data = mData+mDataPos; 592 593 // Need to pad at end? 594 if (padded != len) { 595#if BYTE_ORDER == BIG_ENDIAN 596 static const uint32_t mask[4] = { 597 0x00000000, 0xffffff00, 0xffff0000, 0xff000000 598 }; 599#endif 600#if BYTE_ORDER == LITTLE_ENDIAN 601 static const uint32_t mask[4] = { 602 0x00000000, 0x00ffffff, 0x0000ffff, 0x000000ff 603 }; 604#endif 605 //printf("Applying pad mask: %p to %p\n", (void*)mask[padded-len], 606 // *reinterpret_cast<void**>(data+padded-4)); 607 *reinterpret_cast<uint32_t*>(data+padded-4) &= mask[padded-len]; 608 } 609 610 finishWrite(padded); 611 return data; 612 } 613 614 status_t err = growData(padded); 615 if (err == NO_ERROR) goto restart_write; 616 return NULL; 617} 618 619status_t Parcel::writeInt32(int32_t val) 620{ 621 return writeAligned(val); 622} 623status_t Parcel::writeInt32Array(size_t len, const int32_t *val) { 624 if (!val) { 625 return writeAligned(-1); 626 } 627 status_t ret = writeAligned(len); 628 if (ret == NO_ERROR) { 629 ret = write(val, len * sizeof(*val)); 630 } 631 return ret; 632} 633 634status_t Parcel::writeInt64(int64_t val) 635{ 636 return writeAligned(val); 637} 638 639status_t Parcel::writePointer(uintptr_t val) 640{ 641 return writeAligned<binder_uintptr_t>(val); 642} 643 644status_t Parcel::writeFloat(float val) 645{ 646 return writeAligned(val); 647} 648 649#if defined(__mips__) && defined(__mips_hard_float) 650 651status_t Parcel::writeDouble(double val) 652{ 653 union { 654 double d; 655 unsigned long long ll; 656 } u; 657 u.d = val; 658 return writeAligned(u.ll); 659} 660 661#else 662 663status_t Parcel::writeDouble(double val) 664{ 665 return writeAligned(val); 666} 667 668#endif 669 670status_t Parcel::writeIntPtr(intptr_t val) 671{ 672 return writeAligned(val); 673} 674 675status_t Parcel::writeCString(const char* str) 676{ 677 return write(str, strlen(str)+1); 678} 679 680status_t Parcel::writeString8(const String8& str) 681{ 682 status_t err = writeInt32(str.bytes()); 683 // only write string if its length is more than zero characters, 684 // as readString8 will only read if the length field is non-zero. 685 // this is slightly different from how writeString16 works. 686 if (str.bytes() > 0 && err == NO_ERROR) { 687 err = write(str.string(), str.bytes()+1); 688 } 689 return err; 690} 691 692status_t Parcel::writeString16(const String16& str) 693{ 694 return writeString16(str.string(), str.size()); 695} 696 697status_t Parcel::writeString16(const char16_t* str, size_t len) 698{ 699 if (str == NULL) return writeInt32(-1); 700 701 status_t err = writeInt32(len); 702 if (err == NO_ERROR) { 703 len *= sizeof(char16_t); 704 uint8_t* data = (uint8_t*)writeInplace(len+sizeof(char16_t)); 705 if (data) { 706 memcpy(data, str, len); 707 *reinterpret_cast<char16_t*>(data+len) = 0; 708 return NO_ERROR; 709 } 710 err = mError; 711 } 712 return err; 713} 714 715status_t Parcel::writeStrongBinder(const sp<IBinder>& val) 716{ 717 return flatten_binder(ProcessState::self(), val, this); 718} 719 720status_t Parcel::writeWeakBinder(const wp<IBinder>& val) 721{ 722 return flatten_binder(ProcessState::self(), val, this); 723} 724 725status_t Parcel::writeNativeHandle(const native_handle* handle) 726{ 727 if (!handle || handle->version != sizeof(native_handle)) 728 return BAD_TYPE; 729 730 status_t err; 731 err = writeInt32(handle->numFds); 732 if (err != NO_ERROR) return err; 733 734 err = writeInt32(handle->numInts); 735 if (err != NO_ERROR) return err; 736 737 for (int i=0 ; err==NO_ERROR && i<handle->numFds ; i++) 738 err = writeDupFileDescriptor(handle->data[i]); 739 740 if (err != NO_ERROR) { 741 ALOGD("write native handle, write dup fd failed"); 742 return err; 743 } 744 err = write(handle->data + handle->numFds, sizeof(int)*handle->numInts); 745 return err; 746} 747 748status_t Parcel::writeFileDescriptor(int fd, bool takeOwnership) 749{ 750 flat_binder_object obj; 751 obj.type = BINDER_TYPE_FD; 752 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 753 obj.binder = 0; /* Don't pass uninitialized stack data to a remote process */ 754 obj.handle = fd; 755 obj.cookie = takeOwnership ? 1 : 0; 756 return writeObject(obj, true); 757} 758 759status_t Parcel::writeDupFileDescriptor(int fd) 760{ 761 int dupFd = dup(fd); 762 if (dupFd < 0) { 763 return -errno; 764 } 765 status_t err = writeFileDescriptor(dupFd, true /*takeOwnership*/); 766 if (err) { 767 close(dupFd); 768 } 769 return err; 770} 771 772status_t Parcel::writeBlob(size_t len, WritableBlob* outBlob) 773{ 774 status_t status; 775 776 if (!mAllowFds || len <= IN_PLACE_BLOB_LIMIT) { 777 ALOGV("writeBlob: write in place"); 778 status = writeInt32(0); 779 if (status) return status; 780 781 void* ptr = writeInplace(len); 782 if (!ptr) return NO_MEMORY; 783 784 outBlob->init(false /*mapped*/, ptr, len); 785 return NO_ERROR; 786 } 787 788 ALOGV("writeBlob: write to ashmem"); 789 int fd = ashmem_create_region("Parcel Blob", len); 790 if (fd < 0) return NO_MEMORY; 791 792 int result = ashmem_set_prot_region(fd, PROT_READ | PROT_WRITE); 793 if (result < 0) { 794 status = result; 795 } else { 796 void* ptr = ::mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); 797 if (ptr == MAP_FAILED) { 798 status = -errno; 799 } else { 800 result = ashmem_set_prot_region(fd, PROT_READ); 801 if (result < 0) { 802 status = result; 803 } else { 804 status = writeInt32(1); 805 if (!status) { 806 status = writeFileDescriptor(fd, true /*takeOwnership*/); 807 if (!status) { 808 outBlob->init(true /*mapped*/, ptr, len); 809 return NO_ERROR; 810 } 811 } 812 } 813 } 814 ::munmap(ptr, len); 815 } 816 ::close(fd); 817 return status; 818} 819 820status_t Parcel::write(const FlattenableHelperInterface& val) 821{ 822 status_t err; 823 824 // size if needed 825 const size_t len = val.getFlattenedSize(); 826 const size_t fd_count = val.getFdCount(); 827 828 err = this->writeInt32(len); 829 if (err) return err; 830 831 err = this->writeInt32(fd_count); 832 if (err) return err; 833 834 // payload 835 void* const buf = this->writeInplace(PAD_SIZE(len)); 836 if (buf == NULL) 837 return BAD_VALUE; 838 839 int* fds = NULL; 840 if (fd_count) { 841 fds = new int[fd_count]; 842 } 843 844 err = val.flatten(buf, len, fds, fd_count); 845 for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) { 846 err = this->writeDupFileDescriptor( fds[i] ); 847 } 848 849 if (fd_count) { 850 delete [] fds; 851 } 852 853 return err; 854} 855 856status_t Parcel::writeObject(const flat_binder_object& val, bool nullMetaData) 857{ 858 const bool enoughData = (mDataPos+sizeof(val)) <= mDataCapacity; 859 const bool enoughObjects = mObjectsSize < mObjectsCapacity; 860 if (enoughData && enoughObjects) { 861restart_write: 862 *reinterpret_cast<flat_binder_object*>(mData+mDataPos) = val; 863 864 // Need to write meta-data? 865 if (nullMetaData || val.binder != 0) { 866 mObjects[mObjectsSize] = mDataPos; 867 acquire_object(ProcessState::self(), val, this); 868 mObjectsSize++; 869 } 870 871 // remember if it's a file descriptor 872 if (val.type == BINDER_TYPE_FD) { 873 if (!mAllowFds) { 874 return FDS_NOT_ALLOWED; 875 } 876 mHasFds = mFdsKnown = true; 877 } 878 879 return finishWrite(sizeof(flat_binder_object)); 880 } 881 882 if (!enoughData) { 883 const status_t err = growData(sizeof(val)); 884 if (err != NO_ERROR) return err; 885 } 886 if (!enoughObjects) { 887 size_t newSize = ((mObjectsSize+2)*3)/2; 888 binder_size_t* objects = (binder_size_t*)realloc(mObjects, newSize*sizeof(binder_size_t)); 889 if (objects == NULL) return NO_MEMORY; 890 mObjects = objects; 891 mObjectsCapacity = newSize; 892 } 893 894 goto restart_write; 895} 896 897status_t Parcel::writeNoException() 898{ 899 return writeInt32(0); 900} 901 902void Parcel::remove(size_t /*start*/, size_t /*amt*/) 903{ 904 LOG_ALWAYS_FATAL("Parcel::remove() not yet implemented!"); 905} 906 907status_t Parcel::read(void* outData, size_t len) const 908{ 909 if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize) { 910 memcpy(outData, mData+mDataPos, len); 911 mDataPos += PAD_SIZE(len); 912 ALOGV("read Setting data pos of %p to %d\n", this, mDataPos); 913 return NO_ERROR; 914 } 915 return NOT_ENOUGH_DATA; 916} 917 918const void* Parcel::readInplace(size_t len) const 919{ 920 if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize) { 921 const void* data = mData+mDataPos; 922 mDataPos += PAD_SIZE(len); 923 ALOGV("readInplace Setting data pos of %p to %d\n", this, mDataPos); 924 return data; 925 } 926 return NULL; 927} 928 929template<class T> 930status_t Parcel::readAligned(T *pArg) const { 931 COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T)); 932 933 if ((mDataPos+sizeof(T)) <= mDataSize) { 934 const void* data = mData+mDataPos; 935 mDataPos += sizeof(T); 936 *pArg = *reinterpret_cast<const T*>(data); 937 return NO_ERROR; 938 } else { 939 return NOT_ENOUGH_DATA; 940 } 941} 942 943template<class T> 944T Parcel::readAligned() const { 945 T result; 946 if (readAligned(&result) != NO_ERROR) { 947 result = 0; 948 } 949 950 return result; 951} 952 953template<class T> 954status_t Parcel::writeAligned(T val) { 955 COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T)); 956 957 if ((mDataPos+sizeof(val)) <= mDataCapacity) { 958restart_write: 959 *reinterpret_cast<T*>(mData+mDataPos) = val; 960 return finishWrite(sizeof(val)); 961 } 962 963 status_t err = growData(sizeof(val)); 964 if (err == NO_ERROR) goto restart_write; 965 return err; 966} 967 968status_t Parcel::readInt32(int32_t *pArg) const 969{ 970 return readAligned(pArg); 971} 972 973int32_t Parcel::readInt32() const 974{ 975 return readAligned<int32_t>(); 976} 977 978 979status_t Parcel::readInt64(int64_t *pArg) const 980{ 981 return readAligned(pArg); 982} 983 984 985int64_t Parcel::readInt64() const 986{ 987 return readAligned<int64_t>(); 988} 989 990status_t Parcel::readPointer(uintptr_t *pArg) const 991{ 992 status_t ret; 993 binder_uintptr_t ptr; 994 ret = readAligned(&ptr); 995 if (!ret) 996 *pArg = ptr; 997 return ret; 998} 999 1000uintptr_t Parcel::readPointer() const 1001{ 1002 return readAligned<binder_uintptr_t>(); 1003} 1004 1005 1006status_t Parcel::readFloat(float *pArg) const 1007{ 1008 return readAligned(pArg); 1009} 1010 1011 1012float Parcel::readFloat() const 1013{ 1014 return readAligned<float>(); 1015} 1016 1017#if defined(__mips__) && defined(__mips_hard_float) 1018 1019status_t Parcel::readDouble(double *pArg) const 1020{ 1021 union { 1022 double d; 1023 unsigned long long ll; 1024 } u; 1025 status_t status; 1026 status = readAligned(&u.ll); 1027 *pArg = u.d; 1028 return status; 1029} 1030 1031double Parcel::readDouble() const 1032{ 1033 union { 1034 double d; 1035 unsigned long long ll; 1036 } u; 1037 u.ll = readAligned<unsigned long long>(); 1038 return u.d; 1039} 1040 1041#else 1042 1043status_t Parcel::readDouble(double *pArg) const 1044{ 1045 return readAligned(pArg); 1046} 1047 1048double Parcel::readDouble() const 1049{ 1050 return readAligned<double>(); 1051} 1052 1053#endif 1054 1055status_t Parcel::readIntPtr(intptr_t *pArg) const 1056{ 1057 return readAligned(pArg); 1058} 1059 1060 1061intptr_t Parcel::readIntPtr() const 1062{ 1063 return readAligned<intptr_t>(); 1064} 1065 1066 1067const char* Parcel::readCString() const 1068{ 1069 const size_t avail = mDataSize-mDataPos; 1070 if (avail > 0) { 1071 const char* str = reinterpret_cast<const char*>(mData+mDataPos); 1072 // is the string's trailing NUL within the parcel's valid bounds? 1073 const char* eos = reinterpret_cast<const char*>(memchr(str, 0, avail)); 1074 if (eos) { 1075 const size_t len = eos - str; 1076 mDataPos += PAD_SIZE(len+1); 1077 ALOGV("readCString Setting data pos of %p to %d\n", this, mDataPos); 1078 return str; 1079 } 1080 } 1081 return NULL; 1082} 1083 1084String8 Parcel::readString8() const 1085{ 1086 int32_t size = readInt32(); 1087 // watch for potential int overflow adding 1 for trailing NUL 1088 if (size > 0 && size < INT32_MAX) { 1089 const char* str = (const char*)readInplace(size+1); 1090 if (str) return String8(str, size); 1091 } 1092 return String8(); 1093} 1094 1095String16 Parcel::readString16() const 1096{ 1097 size_t len; 1098 const char16_t* str = readString16Inplace(&len); 1099 if (str) return String16(str, len); 1100 ALOGE("Reading a NULL string not supported here."); 1101 return String16(); 1102} 1103 1104const char16_t* Parcel::readString16Inplace(size_t* outLen) const 1105{ 1106 int32_t size = readInt32(); 1107 // watch for potential int overflow from size+1 1108 if (size >= 0 && size < INT32_MAX) { 1109 *outLen = size; 1110 const char16_t* str = (const char16_t*)readInplace((size+1)*sizeof(char16_t)); 1111 if (str != NULL) { 1112 return str; 1113 } 1114 } 1115 *outLen = 0; 1116 return NULL; 1117} 1118 1119sp<IBinder> Parcel::readStrongBinder() const 1120{ 1121 sp<IBinder> val; 1122 unflatten_binder(ProcessState::self(), *this, &val); 1123 return val; 1124} 1125 1126wp<IBinder> Parcel::readWeakBinder() const 1127{ 1128 wp<IBinder> val; 1129 unflatten_binder(ProcessState::self(), *this, &val); 1130 return val; 1131} 1132 1133int32_t Parcel::readExceptionCode() const 1134{ 1135 int32_t exception_code = readAligned<int32_t>(); 1136 if (exception_code == EX_HAS_REPLY_HEADER) { 1137 int32_t header_start = dataPosition(); 1138 int32_t header_size = readAligned<int32_t>(); 1139 // Skip over fat responses headers. Not used (or propagated) in 1140 // native code 1141 setDataPosition(header_start + header_size); 1142 // And fat response headers are currently only used when there are no 1143 // exceptions, so return no error: 1144 return 0; 1145 } 1146 return exception_code; 1147} 1148 1149native_handle* Parcel::readNativeHandle() const 1150{ 1151 int numFds, numInts; 1152 status_t err; 1153 err = readInt32(&numFds); 1154 if (err != NO_ERROR) return 0; 1155 err = readInt32(&numInts); 1156 if (err != NO_ERROR) return 0; 1157 1158 native_handle* h = native_handle_create(numFds, numInts); 1159 for (int i=0 ; err==NO_ERROR && i<numFds ; i++) { 1160 h->data[i] = dup(readFileDescriptor()); 1161 if (h->data[i] < 0) err = BAD_VALUE; 1162 } 1163 err = read(h->data + numFds, sizeof(int)*numInts); 1164 if (err != NO_ERROR) { 1165 native_handle_close(h); 1166 native_handle_delete(h); 1167 h = 0; 1168 } 1169 return h; 1170} 1171 1172 1173int Parcel::readFileDescriptor() const 1174{ 1175 const flat_binder_object* flat = readObject(true); 1176 if (flat) { 1177 switch (flat->type) { 1178 case BINDER_TYPE_FD: 1179 //ALOGI("Returning file descriptor %ld from parcel %p\n", flat->handle, this); 1180 return flat->handle; 1181 } 1182 } 1183 return BAD_TYPE; 1184} 1185 1186status_t Parcel::readBlob(size_t len, ReadableBlob* outBlob) const 1187{ 1188 int32_t useAshmem; 1189 status_t status = readInt32(&useAshmem); 1190 if (status) return status; 1191 1192 if (!useAshmem) { 1193 ALOGV("readBlob: read in place"); 1194 const void* ptr = readInplace(len); 1195 if (!ptr) return BAD_VALUE; 1196 1197 outBlob->init(false /*mapped*/, const_cast<void*>(ptr), len); 1198 return NO_ERROR; 1199 } 1200 1201 ALOGV("readBlob: read from ashmem"); 1202 int fd = readFileDescriptor(); 1203 if (fd == int(BAD_TYPE)) return BAD_VALUE; 1204 1205 void* ptr = ::mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0); 1206 if (!ptr) return NO_MEMORY; 1207 1208 outBlob->init(true /*mapped*/, ptr, len); 1209 return NO_ERROR; 1210} 1211 1212status_t Parcel::read(FlattenableHelperInterface& val) const 1213{ 1214 // size 1215 const size_t len = this->readInt32(); 1216 const size_t fd_count = this->readInt32(); 1217 1218 // payload 1219 void const* const buf = this->readInplace(PAD_SIZE(len)); 1220 if (buf == NULL) 1221 return BAD_VALUE; 1222 1223 int* fds = NULL; 1224 if (fd_count) { 1225 fds = new int[fd_count]; 1226 } 1227 1228 status_t err = NO_ERROR; 1229 for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) { 1230 fds[i] = dup(this->readFileDescriptor()); 1231 if (fds[i] < 0) err = BAD_VALUE; 1232 } 1233 1234 if (err == NO_ERROR) { 1235 err = val.unflatten(buf, len, fds, fd_count); 1236 } 1237 1238 if (fd_count) { 1239 delete [] fds; 1240 } 1241 1242 return err; 1243} 1244const flat_binder_object* Parcel::readObject(bool nullMetaData) const 1245{ 1246 const size_t DPOS = mDataPos; 1247 if ((DPOS+sizeof(flat_binder_object)) <= mDataSize) { 1248 const flat_binder_object* obj 1249 = reinterpret_cast<const flat_binder_object*>(mData+DPOS); 1250 mDataPos = DPOS + sizeof(flat_binder_object); 1251 if (!nullMetaData && (obj->cookie == 0 && obj->binder == 0)) { 1252 // When transferring a NULL object, we don't write it into 1253 // the object list, so we don't want to check for it when 1254 // reading. 1255 ALOGV("readObject Setting data pos of %p to %d\n", this, mDataPos); 1256 return obj; 1257 } 1258 1259 // Ensure that this object is valid... 1260 binder_size_t* const OBJS = mObjects; 1261 const size_t N = mObjectsSize; 1262 size_t opos = mNextObjectHint; 1263 1264 if (N > 0) { 1265 ALOGV("Parcel %p looking for obj at %d, hint=%d\n", 1266 this, DPOS, opos); 1267 1268 // Start at the current hint position, looking for an object at 1269 // the current data position. 1270 if (opos < N) { 1271 while (opos < (N-1) && OBJS[opos] < DPOS) { 1272 opos++; 1273 } 1274 } else { 1275 opos = N-1; 1276 } 1277 if (OBJS[opos] == DPOS) { 1278 // Found it! 1279 ALOGV("Parcel found obj %d at index %d with forward search", 1280 this, DPOS, opos); 1281 mNextObjectHint = opos+1; 1282 ALOGV("readObject Setting data pos of %p to %d\n", this, mDataPos); 1283 return obj; 1284 } 1285 1286 // Look backwards for it... 1287 while (opos > 0 && OBJS[opos] > DPOS) { 1288 opos--; 1289 } 1290 if (OBJS[opos] == DPOS) { 1291 // Found it! 1292 ALOGV("Parcel found obj %d at index %d with backward search", 1293 this, DPOS, opos); 1294 mNextObjectHint = opos+1; 1295 ALOGV("readObject Setting data pos of %p to %d\n", this, mDataPos); 1296 return obj; 1297 } 1298 } 1299 ALOGW("Attempt to read object from Parcel %p at offset %zu that is not in the object list", 1300 this, DPOS); 1301 } 1302 return NULL; 1303} 1304 1305void Parcel::closeFileDescriptors() 1306{ 1307 size_t i = mObjectsSize; 1308 if (i > 0) { 1309 //ALOGI("Closing file descriptors for %d objects...", mObjectsSize); 1310 } 1311 while (i > 0) { 1312 i--; 1313 const flat_binder_object* flat 1314 = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]); 1315 if (flat->type == BINDER_TYPE_FD) { 1316 //ALOGI("Closing fd: %ld\n", flat->handle); 1317 close(flat->handle); 1318 } 1319 } 1320} 1321 1322uintptr_t Parcel::ipcData() const 1323{ 1324 return reinterpret_cast<uintptr_t>(mData); 1325} 1326 1327size_t Parcel::ipcDataSize() const 1328{ 1329 return (mDataSize > mDataPos ? mDataSize : mDataPos); 1330} 1331 1332uintptr_t Parcel::ipcObjects() const 1333{ 1334 return reinterpret_cast<uintptr_t>(mObjects); 1335} 1336 1337size_t Parcel::ipcObjectsCount() const 1338{ 1339 return mObjectsSize; 1340} 1341 1342void Parcel::ipcSetDataReference(const uint8_t* data, size_t dataSize, 1343 const binder_size_t* objects, size_t objectsCount, release_func relFunc, void* relCookie) 1344{ 1345 freeDataNoInit(); 1346 mError = NO_ERROR; 1347 mData = const_cast<uint8_t*>(data); 1348 mDataSize = mDataCapacity = dataSize; 1349 //ALOGI("setDataReference Setting data size of %p to %lu (pid=%d)\n", this, mDataSize, getpid()); 1350 mDataPos = 0; 1351 ALOGV("setDataReference Setting data pos of %p to %d\n", this, mDataPos); 1352 mObjects = const_cast<binder_size_t*>(objects); 1353 mObjectsSize = mObjectsCapacity = objectsCount; 1354 mNextObjectHint = 0; 1355 mOwner = relFunc; 1356 mOwnerCookie = relCookie; 1357 scanForFds(); 1358} 1359 1360void Parcel::print(TextOutput& to, uint32_t /*flags*/) const 1361{ 1362 to << "Parcel("; 1363 1364 if (errorCheck() != NO_ERROR) { 1365 const status_t err = errorCheck(); 1366 to << "Error: " << (void*)(intptr_t)err << " \"" << strerror(-err) << "\""; 1367 } else if (dataSize() > 0) { 1368 const uint8_t* DATA = data(); 1369 to << indent << HexDump(DATA, dataSize()) << dedent; 1370 const binder_size_t* OBJS = objects(); 1371 const size_t N = objectsCount(); 1372 for (size_t i=0; i<N; i++) { 1373 const flat_binder_object* flat 1374 = reinterpret_cast<const flat_binder_object*>(DATA+OBJS[i]); 1375 to << endl << "Object #" << i << " @ " << (void*)OBJS[i] << ": " 1376 << TypeCode(flat->type & 0x7f7f7f00) 1377 << " = " << flat->binder; 1378 } 1379 } else { 1380 to << "NULL"; 1381 } 1382 1383 to << ")"; 1384} 1385 1386void Parcel::releaseObjects() 1387{ 1388 const sp<ProcessState> proc(ProcessState::self()); 1389 size_t i = mObjectsSize; 1390 uint8_t* const data = mData; 1391 binder_size_t* const objects = mObjects; 1392 while (i > 0) { 1393 i--; 1394 const flat_binder_object* flat 1395 = reinterpret_cast<flat_binder_object*>(data+objects[i]); 1396 release_object(proc, *flat, this); 1397 } 1398} 1399 1400void Parcel::acquireObjects() 1401{ 1402 const sp<ProcessState> proc(ProcessState::self()); 1403 size_t i = mObjectsSize; 1404 uint8_t* const data = mData; 1405 binder_size_t* const objects = mObjects; 1406 while (i > 0) { 1407 i--; 1408 const flat_binder_object* flat 1409 = reinterpret_cast<flat_binder_object*>(data+objects[i]); 1410 acquire_object(proc, *flat, this); 1411 } 1412} 1413 1414void Parcel::freeData() 1415{ 1416 freeDataNoInit(); 1417 initState(); 1418} 1419 1420void Parcel::freeDataNoInit() 1421{ 1422 if (mOwner) { 1423 //ALOGI("Freeing data ref of %p (pid=%d)\n", this, getpid()); 1424 mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie); 1425 } else { 1426 releaseObjects(); 1427 if (mData) free(mData); 1428 if (mObjects) free(mObjects); 1429 } 1430} 1431 1432status_t Parcel::growData(size_t len) 1433{ 1434 size_t newSize = ((mDataSize+len)*3)/2; 1435 return (newSize <= mDataSize) 1436 ? (status_t) NO_MEMORY 1437 : continueWrite(newSize); 1438} 1439 1440status_t Parcel::restartWrite(size_t desired) 1441{ 1442 if (mOwner) { 1443 freeData(); 1444 return continueWrite(desired); 1445 } 1446 1447 uint8_t* data = (uint8_t*)realloc(mData, desired); 1448 if (!data && desired > mDataCapacity) { 1449 mError = NO_MEMORY; 1450 return NO_MEMORY; 1451 } 1452 1453 releaseObjects(); 1454 1455 if (data) { 1456 mData = data; 1457 mDataCapacity = desired; 1458 } 1459 1460 mDataSize = mDataPos = 0; 1461 ALOGV("restartWrite Setting data size of %p to %d\n", this, mDataSize); 1462 ALOGV("restartWrite Setting data pos of %p to %d\n", this, mDataPos); 1463 1464 free(mObjects); 1465 mObjects = NULL; 1466 mObjectsSize = mObjectsCapacity = 0; 1467 mNextObjectHint = 0; 1468 mHasFds = false; 1469 mFdsKnown = true; 1470 mAllowFds = true; 1471 1472 return NO_ERROR; 1473} 1474 1475status_t Parcel::continueWrite(size_t desired) 1476{ 1477 // If shrinking, first adjust for any objects that appear 1478 // after the new data size. 1479 size_t objectsSize = mObjectsSize; 1480 if (desired < mDataSize) { 1481 if (desired == 0) { 1482 objectsSize = 0; 1483 } else { 1484 while (objectsSize > 0) { 1485 if (mObjects[objectsSize-1] < desired) 1486 break; 1487 objectsSize--; 1488 } 1489 } 1490 } 1491 1492 if (mOwner) { 1493 // If the size is going to zero, just release the owner's data. 1494 if (desired == 0) { 1495 freeData(); 1496 return NO_ERROR; 1497 } 1498 1499 // If there is a different owner, we need to take 1500 // posession. 1501 uint8_t* data = (uint8_t*)malloc(desired); 1502 if (!data) { 1503 mError = NO_MEMORY; 1504 return NO_MEMORY; 1505 } 1506 binder_size_t* objects = NULL; 1507 1508 if (objectsSize) { 1509 objects = (binder_size_t*)malloc(objectsSize*sizeof(binder_size_t)); 1510 if (!objects) { 1511 free(data); 1512 1513 mError = NO_MEMORY; 1514 return NO_MEMORY; 1515 } 1516 1517 // Little hack to only acquire references on objects 1518 // we will be keeping. 1519 size_t oldObjectsSize = mObjectsSize; 1520 mObjectsSize = objectsSize; 1521 acquireObjects(); 1522 mObjectsSize = oldObjectsSize; 1523 } 1524 1525 if (mData) { 1526 memcpy(data, mData, mDataSize < desired ? mDataSize : desired); 1527 } 1528 if (objects && mObjects) { 1529 memcpy(objects, mObjects, objectsSize*sizeof(binder_size_t)); 1530 } 1531 //ALOGI("Freeing data ref of %p (pid=%d)\n", this, getpid()); 1532 mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie); 1533 mOwner = NULL; 1534 1535 mData = data; 1536 mObjects = objects; 1537 mDataSize = (mDataSize < desired) ? mDataSize : desired; 1538 ALOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize); 1539 mDataCapacity = desired; 1540 mObjectsSize = mObjectsCapacity = objectsSize; 1541 mNextObjectHint = 0; 1542 1543 } else if (mData) { 1544 if (objectsSize < mObjectsSize) { 1545 // Need to release refs on any objects we are dropping. 1546 const sp<ProcessState> proc(ProcessState::self()); 1547 for (size_t i=objectsSize; i<mObjectsSize; i++) { 1548 const flat_binder_object* flat 1549 = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]); 1550 if (flat->type == BINDER_TYPE_FD) { 1551 // will need to rescan because we may have lopped off the only FDs 1552 mFdsKnown = false; 1553 } 1554 release_object(proc, *flat, this); 1555 } 1556 binder_size_t* objects = 1557 (binder_size_t*)realloc(mObjects, objectsSize*sizeof(binder_size_t)); 1558 if (objects) { 1559 mObjects = objects; 1560 } 1561 mObjectsSize = objectsSize; 1562 mNextObjectHint = 0; 1563 } 1564 1565 // We own the data, so we can just do a realloc(). 1566 if (desired > mDataCapacity) { 1567 uint8_t* data = (uint8_t*)realloc(mData, desired); 1568 if (data) { 1569 mData = data; 1570 mDataCapacity = desired; 1571 } else if (desired > mDataCapacity) { 1572 mError = NO_MEMORY; 1573 return NO_MEMORY; 1574 } 1575 } else { 1576 if (mDataSize > desired) { 1577 mDataSize = desired; 1578 ALOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize); 1579 } 1580 if (mDataPos > desired) { 1581 mDataPos = desired; 1582 ALOGV("continueWrite Setting data pos of %p to %d\n", this, mDataPos); 1583 } 1584 } 1585 1586 } else { 1587 // This is the first data. Easy! 1588 uint8_t* data = (uint8_t*)malloc(desired); 1589 if (!data) { 1590 mError = NO_MEMORY; 1591 return NO_MEMORY; 1592 } 1593 1594 if(!(mDataCapacity == 0 && mObjects == NULL 1595 && mObjectsCapacity == 0)) { 1596 ALOGE("continueWrite: %zu/%p/%zu/%zu", mDataCapacity, mObjects, mObjectsCapacity, desired); 1597 } 1598 1599 mData = data; 1600 mDataSize = mDataPos = 0; 1601 ALOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize); 1602 ALOGV("continueWrite Setting data pos of %p to %d\n", this, mDataPos); 1603 mDataCapacity = desired; 1604 } 1605 1606 return NO_ERROR; 1607} 1608 1609void Parcel::initState() 1610{ 1611 mError = NO_ERROR; 1612 mData = 0; 1613 mDataSize = 0; 1614 mDataCapacity = 0; 1615 mDataPos = 0; 1616 ALOGV("initState Setting data size of %p to %d\n", this, mDataSize); 1617 ALOGV("initState Setting data pos of %p to %d\n", this, mDataPos); 1618 mObjects = NULL; 1619 mObjectsSize = 0; 1620 mObjectsCapacity = 0; 1621 mNextObjectHint = 0; 1622 mHasFds = false; 1623 mFdsKnown = true; 1624 mAllowFds = true; 1625 mOwner = NULL; 1626} 1627 1628void Parcel::scanForFds() const 1629{ 1630 bool hasFds = false; 1631 for (size_t i=0; i<mObjectsSize; i++) { 1632 const flat_binder_object* flat 1633 = reinterpret_cast<const flat_binder_object*>(mData + mObjects[i]); 1634 if (flat->type == BINDER_TYPE_FD) { 1635 hasFds = true; 1636 break; 1637 } 1638 } 1639 mHasFds = hasFds; 1640 mFdsKnown = true; 1641} 1642 1643// --- Parcel::Blob --- 1644 1645Parcel::Blob::Blob() : 1646 mMapped(false), mData(NULL), mSize(0) { 1647} 1648 1649Parcel::Blob::~Blob() { 1650 release(); 1651} 1652 1653void Parcel::Blob::release() { 1654 if (mMapped && mData) { 1655 ::munmap(mData, mSize); 1656 } 1657 clear(); 1658} 1659 1660void Parcel::Blob::init(bool mapped, void* data, size_t size) { 1661 mMapped = mapped; 1662 mData = data; 1663 mSize = size; 1664} 1665 1666void Parcel::Blob::clear() { 1667 mMapped = false; 1668 mData = NULL; 1669 mSize = 0; 1670} 1671 1672}; // namespace android 1673