Parcel.cpp revision f0a2475905786d5457e7af838ac714acbfdafa4f
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 39#include <inttypes.h> 40#include <stdio.h> 41#include <stdlib.h> 42#include <stdint.h> 43#include <sys/mman.h> 44 45#ifndef INT32_MAX 46#define INT32_MAX ((int32_t)(2147483647)) 47#endif 48 49#define LOG_REFS(...) 50//#define LOG_REFS(...) ALOG(LOG_DEBUG, "Parcel", __VA_ARGS__) 51 52// --------------------------------------------------------------------------- 53 54#define PAD_SIZE(s) (((s)+3)&~3) 55 56// Note: must be kept in sync with android/os/StrictMode.java's PENALTY_GATHER 57#define STRICT_MODE_PENALTY_GATHER 0x100 58 59// Note: must be kept in sync with android/os/Parcel.java's EX_HAS_REPLY_HEADER 60#define EX_HAS_REPLY_HEADER -128 61 62// Maximum size of a blob to transfer in-place. 63static const size_t IN_PLACE_BLOB_LIMIT = 40 * 1024; 64 65// XXX This can be made public if we want to provide 66// support for typed data. 67struct small_flat_data 68{ 69 uint32_t type; 70 uint32_t data; 71}; 72 73namespace android { 74 75void acquire_object(const sp<ProcessState>& proc, 76 const flat_binder_object& obj, const void* who) 77{ 78 switch (obj.type) { 79 case BINDER_TYPE_BINDER: 80 if (obj.binder) { 81 LOG_REFS("Parcel %p acquiring reference on local %p", who, obj.cookie); 82 reinterpret_cast<IBinder*>(obj.cookie)->incStrong(who); 83 } 84 return; 85 case BINDER_TYPE_WEAK_BINDER: 86 if (obj.binder) 87 reinterpret_cast<RefBase::weakref_type*>(obj.binder)->incWeak(who); 88 return; 89 case BINDER_TYPE_HANDLE: { 90 const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle); 91 if (b != NULL) { 92 LOG_REFS("Parcel %p acquiring reference on remote %p", who, b.get()); 93 b->incStrong(who); 94 } 95 return; 96 } 97 case BINDER_TYPE_WEAK_HANDLE: { 98 const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle); 99 if (b != NULL) b.get_refs()->incWeak(who); 100 return; 101 } 102 case BINDER_TYPE_FD: { 103 // intentionally blank -- nothing to do to acquire this, but we do 104 // recognize it as a legitimate object type. 105 return; 106 } 107 } 108 109 ALOGD("Invalid object type 0x%08x", obj.type); 110} 111 112void release_object(const sp<ProcessState>& proc, 113 const flat_binder_object& obj, const void* who) 114{ 115 switch (obj.type) { 116 case BINDER_TYPE_BINDER: 117 if (obj.binder) { 118 LOG_REFS("Parcel %p releasing reference on local %p", who, obj.cookie); 119 reinterpret_cast<IBinder*>(obj.cookie)->decStrong(who); 120 } 121 return; 122 case BINDER_TYPE_WEAK_BINDER: 123 if (obj.binder) 124 reinterpret_cast<RefBase::weakref_type*>(obj.binder)->decWeak(who); 125 return; 126 case BINDER_TYPE_HANDLE: { 127 const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle); 128 if (b != NULL) { 129 LOG_REFS("Parcel %p releasing reference on remote %p", who, b.get()); 130 b->decStrong(who); 131 } 132 return; 133 } 134 case BINDER_TYPE_WEAK_HANDLE: { 135 const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle); 136 if (b != NULL) b.get_refs()->decWeak(who); 137 return; 138 } 139 case BINDER_TYPE_FD: { 140 if (obj.cookie != 0) close(obj.handle); 141 return; 142 } 143 } 144 145 ALOGE("Invalid object type 0x%08x", obj.type); 146} 147 148inline static status_t finish_flatten_binder( 149 const sp<IBinder>& /*binder*/, const flat_binder_object& flat, Parcel* out) 150{ 151 return out->writeObject(flat, false); 152} 153 154status_t flatten_binder(const sp<ProcessState>& /*proc*/, 155 const sp<IBinder>& binder, Parcel* out) 156{ 157 flat_binder_object obj; 158 159 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 160 if (binder != NULL) { 161 IBinder *local = binder->localBinder(); 162 if (!local) { 163 BpBinder *proxy = binder->remoteBinder(); 164 if (proxy == NULL) { 165 ALOGE("null proxy"); 166 } 167 const int32_t handle = proxy ? proxy->handle() : 0; 168 obj.type = BINDER_TYPE_HANDLE; 169 obj.binder = 0; /* Don't pass uninitialized stack data to a remote process */ 170 obj.handle = handle; 171 obj.cookie = 0; 172 } else { 173 obj.type = BINDER_TYPE_BINDER; 174 obj.binder = reinterpret_cast<uintptr_t>(local->getWeakRefs()); 175 obj.cookie = reinterpret_cast<uintptr_t>(local); 176 } 177 } else { 178 obj.type = BINDER_TYPE_BINDER; 179 obj.binder = 0; 180 obj.cookie = 0; 181 } 182 183 return finish_flatten_binder(binder, obj, out); 184} 185 186status_t flatten_binder(const sp<ProcessState>& /*proc*/, 187 const wp<IBinder>& binder, Parcel* out) 188{ 189 flat_binder_object obj; 190 191 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 192 if (binder != NULL) { 193 sp<IBinder> real = binder.promote(); 194 if (real != NULL) { 195 IBinder *local = real->localBinder(); 196 if (!local) { 197 BpBinder *proxy = real->remoteBinder(); 198 if (proxy == NULL) { 199 ALOGE("null proxy"); 200 } 201 const int32_t handle = proxy ? proxy->handle() : 0; 202 obj.type = BINDER_TYPE_WEAK_HANDLE; 203 obj.binder = 0; /* Don't pass uninitialized stack data to a remote process */ 204 obj.handle = handle; 205 obj.cookie = 0; 206 } else { 207 obj.type = BINDER_TYPE_WEAK_BINDER; 208 obj.binder = reinterpret_cast<uintptr_t>(binder.get_refs()); 209 obj.cookie = reinterpret_cast<uintptr_t>(binder.unsafe_get()); 210 } 211 return finish_flatten_binder(real, obj, out); 212 } 213 214 // XXX How to deal? In order to flatten the given binder, 215 // we need to probe it for information, which requires a primary 216 // reference... but we don't have one. 217 // 218 // The OpenBinder implementation uses a dynamic_cast<> here, 219 // but we can't do that with the different reference counting 220 // implementation we are using. 221 ALOGE("Unable to unflatten Binder weak reference!"); 222 obj.type = BINDER_TYPE_BINDER; 223 obj.binder = 0; 224 obj.cookie = 0; 225 return finish_flatten_binder(NULL, obj, out); 226 227 } else { 228 obj.type = BINDER_TYPE_BINDER; 229 obj.binder = 0; 230 obj.cookie = 0; 231 return finish_flatten_binder(NULL, obj, out); 232 } 233} 234 235inline static status_t finish_unflatten_binder( 236 BpBinder* /*proxy*/, const flat_binder_object& /*flat*/, 237 const Parcel& /*in*/) 238{ 239 return NO_ERROR; 240} 241 242status_t unflatten_binder(const sp<ProcessState>& proc, 243 const Parcel& in, sp<IBinder>* out) 244{ 245 const flat_binder_object* flat = in.readObject(false); 246 247 if (flat) { 248 switch (flat->type) { 249 case BINDER_TYPE_BINDER: 250 *out = reinterpret_cast<IBinder*>(flat->cookie); 251 return finish_unflatten_binder(NULL, *flat, in); 252 case BINDER_TYPE_HANDLE: 253 *out = proc->getStrongProxyForHandle(flat->handle); 254 return finish_unflatten_binder( 255 static_cast<BpBinder*>(out->get()), *flat, in); 256 } 257 } 258 return BAD_TYPE; 259} 260 261status_t unflatten_binder(const sp<ProcessState>& proc, 262 const Parcel& in, wp<IBinder>* out) 263{ 264 const flat_binder_object* flat = in.readObject(false); 265 266 if (flat) { 267 switch (flat->type) { 268 case BINDER_TYPE_BINDER: 269 *out = reinterpret_cast<IBinder*>(flat->cookie); 270 return finish_unflatten_binder(NULL, *flat, in); 271 case BINDER_TYPE_WEAK_BINDER: 272 if (flat->binder != 0) { 273 out->set_object_and_refs( 274 reinterpret_cast<IBinder*>(flat->cookie), 275 reinterpret_cast<RefBase::weakref_type*>(flat->binder)); 276 } else { 277 *out = NULL; 278 } 279 return finish_unflatten_binder(NULL, *flat, in); 280 case BINDER_TYPE_HANDLE: 281 case BINDER_TYPE_WEAK_HANDLE: 282 *out = proc->getWeakProxyForHandle(flat->handle); 283 return finish_unflatten_binder( 284 static_cast<BpBinder*>(out->unsafe_get()), *flat, in); 285 } 286 } 287 return BAD_TYPE; 288} 289 290// --------------------------------------------------------------------------- 291 292Parcel::Parcel() 293{ 294 initState(); 295} 296 297Parcel::~Parcel() 298{ 299 freeDataNoInit(); 300} 301 302const uint8_t* Parcel::data() const 303{ 304 return mData; 305} 306 307size_t Parcel::dataSize() const 308{ 309 return (mDataSize > mDataPos ? mDataSize : mDataPos); 310} 311 312size_t Parcel::dataAvail() const 313{ 314 // TODO: decide what to do about the possibility that this can 315 // report an available-data size that exceeds a Java int's max 316 // positive value, causing havoc. Fortunately this will only 317 // happen if someone constructs a Parcel containing more than two 318 // gigabytes of data, which on typical phone hardware is simply 319 // not possible. 320 return dataSize() - dataPosition(); 321} 322 323size_t Parcel::dataPosition() const 324{ 325 return mDataPos; 326} 327 328size_t Parcel::dataCapacity() const 329{ 330 return mDataCapacity; 331} 332 333status_t Parcel::setDataSize(size_t size) 334{ 335 status_t err; 336 err = continueWrite(size); 337 if (err == NO_ERROR) { 338 mDataSize = size; 339 ALOGV("setDataSize Setting data size of %p to %zu", this, mDataSize); 340 } 341 return err; 342} 343 344void Parcel::setDataPosition(size_t pos) const 345{ 346 mDataPos = pos; 347 mNextObjectHint = 0; 348} 349 350status_t Parcel::setDataCapacity(size_t size) 351{ 352 if (size > mDataCapacity) return continueWrite(size); 353 return NO_ERROR; 354} 355 356status_t Parcel::setData(const uint8_t* buffer, size_t len) 357{ 358 status_t err = restartWrite(len); 359 if (err == NO_ERROR) { 360 memcpy(const_cast<uint8_t*>(data()), buffer, len); 361 mDataSize = len; 362 mFdsKnown = false; 363 } 364 return err; 365} 366 367status_t Parcel::appendFrom(const Parcel *parcel, size_t offset, size_t len) 368{ 369 const sp<ProcessState> proc(ProcessState::self()); 370 status_t err; 371 const uint8_t *data = parcel->mData; 372 const binder_size_t *objects = parcel->mObjects; 373 size_t size = parcel->mObjectsSize; 374 int startPos = mDataPos; 375 int firstIndex = -1, lastIndex = -2; 376 377 if (len == 0) { 378 return NO_ERROR; 379 } 380 381 // range checks against the source parcel size 382 if ((offset > parcel->mDataSize) 383 || (len > parcel->mDataSize) 384 || (offset + len > parcel->mDataSize)) { 385 return BAD_VALUE; 386 } 387 388 // Count objects in range 389 for (int i = 0; i < (int) size; i++) { 390 size_t off = objects[i]; 391 if ((off >= offset) && (off < offset + len)) { 392 if (firstIndex == -1) { 393 firstIndex = i; 394 } 395 lastIndex = i; 396 } 397 } 398 int numObjects = lastIndex - firstIndex + 1; 399 400 if ((mDataSize+len) > mDataCapacity) { 401 // grow data 402 err = growData(len); 403 if (err != NO_ERROR) { 404 return err; 405 } 406 } 407 408 // append data 409 memcpy(mData + mDataPos, data + offset, len); 410 mDataPos += len; 411 mDataSize += len; 412 413 err = NO_ERROR; 414 415 if (numObjects > 0) { 416 // grow objects 417 if (mObjectsCapacity < mObjectsSize + numObjects) { 418 int newSize = ((mObjectsSize + numObjects)*3)/2; 419 binder_size_t *objects = 420 (binder_size_t*)realloc(mObjects, newSize*sizeof(binder_size_t)); 421 if (objects == (binder_size_t*)0) { 422 return NO_MEMORY; 423 } 424 mObjects = objects; 425 mObjectsCapacity = newSize; 426 } 427 428 // append and acquire objects 429 int idx = mObjectsSize; 430 for (int i = firstIndex; i <= lastIndex; i++) { 431 size_t off = objects[i] - offset + startPos; 432 mObjects[idx++] = off; 433 mObjectsSize++; 434 435 flat_binder_object* flat 436 = reinterpret_cast<flat_binder_object*>(mData + off); 437 acquire_object(proc, *flat, this); 438 439 if (flat->type == BINDER_TYPE_FD) { 440 // If this is a file descriptor, we need to dup it so the 441 // new Parcel now owns its own fd, and can declare that we 442 // officially know we have fds. 443 flat->handle = dup(flat->handle); 444 flat->cookie = 1; 445 mHasFds = mFdsKnown = true; 446 if (!mAllowFds) { 447 err = FDS_NOT_ALLOWED; 448 } 449 } 450 } 451 } 452 453 return err; 454} 455 456bool Parcel::pushAllowFds(bool allowFds) 457{ 458 const bool origValue = mAllowFds; 459 if (!allowFds) { 460 mAllowFds = false; 461 } 462 return origValue; 463} 464 465void Parcel::restoreAllowFds(bool lastValue) 466{ 467 mAllowFds = lastValue; 468} 469 470bool Parcel::hasFileDescriptors() const 471{ 472 if (!mFdsKnown) { 473 scanForFds(); 474 } 475 return mHasFds; 476} 477 478// Write RPC headers. (previously just the interface token) 479status_t Parcel::writeInterfaceToken(const String16& interface) 480{ 481 writeInt32(IPCThreadState::self()->getStrictModePolicy() | 482 STRICT_MODE_PENALTY_GATHER); 483 // currently the interface identification token is just its name as a string 484 return writeString16(interface); 485} 486 487bool Parcel::checkInterface(IBinder* binder) const 488{ 489 return enforceInterface(binder->getInterfaceDescriptor()); 490} 491 492bool Parcel::enforceInterface(const String16& interface, 493 IPCThreadState* threadState) const 494{ 495 int32_t strictPolicy = readInt32(); 496 if (threadState == NULL) { 497 threadState = IPCThreadState::self(); 498 } 499 if ((threadState->getLastTransactionBinderFlags() & 500 IBinder::FLAG_ONEWAY) != 0) { 501 // For one-way calls, the callee is running entirely 502 // disconnected from the caller, so disable StrictMode entirely. 503 // Not only does disk/network usage not impact the caller, but 504 // there's no way to commuicate back any violations anyway. 505 threadState->setStrictModePolicy(0); 506 } else { 507 threadState->setStrictModePolicy(strictPolicy); 508 } 509 const String16 str(readString16()); 510 if (str == interface) { 511 return true; 512 } else { 513 ALOGW("**** enforceInterface() expected '%s' but read '%s'", 514 String8(interface).string(), String8(str).string()); 515 return false; 516 } 517} 518 519const binder_size_t* Parcel::objects() const 520{ 521 return mObjects; 522} 523 524size_t Parcel::objectsCount() const 525{ 526 return mObjectsSize; 527} 528 529status_t Parcel::errorCheck() const 530{ 531 return mError; 532} 533 534void Parcel::setError(status_t err) 535{ 536 mError = err; 537} 538 539status_t Parcel::finishWrite(size_t len) 540{ 541 //printf("Finish write of %d\n", len); 542 mDataPos += len; 543 ALOGV("finishWrite Setting data pos of %p to %zu", this, mDataPos); 544 if (mDataPos > mDataSize) { 545 mDataSize = mDataPos; 546 ALOGV("finishWrite Setting data size of %p to %zu", this, mDataSize); 547 } 548 //printf("New pos=%d, size=%d\n", mDataPos, mDataSize); 549 return NO_ERROR; 550} 551 552status_t Parcel::writeUnpadded(const void* data, size_t len) 553{ 554 size_t end = mDataPos + len; 555 if (end < mDataPos) { 556 // integer overflow 557 return BAD_VALUE; 558 } 559 560 if (end <= mDataCapacity) { 561restart_write: 562 memcpy(mData+mDataPos, data, len); 563 return finishWrite(len); 564 } 565 566 status_t err = growData(len); 567 if (err == NO_ERROR) goto restart_write; 568 return err; 569} 570 571status_t Parcel::write(const void* data, size_t len) 572{ 573 void* const d = writeInplace(len); 574 if (d) { 575 memcpy(d, data, len); 576 return NO_ERROR; 577 } 578 return mError; 579} 580 581void* Parcel::writeInplace(size_t len) 582{ 583 const size_t padded = PAD_SIZE(len); 584 585 // sanity check for integer overflow 586 if (mDataPos+padded < mDataPos) { 587 return NULL; 588 } 589 590 if ((mDataPos+padded) <= mDataCapacity) { 591restart_write: 592 //printf("Writing %ld bytes, padded to %ld\n", len, padded); 593 uint8_t* const data = mData+mDataPos; 594 595 // Need to pad at end? 596 if (padded != len) { 597#if BYTE_ORDER == BIG_ENDIAN 598 static const uint32_t mask[4] = { 599 0x00000000, 0xffffff00, 0xffff0000, 0xff000000 600 }; 601#endif 602#if BYTE_ORDER == LITTLE_ENDIAN 603 static const uint32_t mask[4] = { 604 0x00000000, 0x00ffffff, 0x0000ffff, 0x000000ff 605 }; 606#endif 607 //printf("Applying pad mask: %p to %p\n", (void*)mask[padded-len], 608 // *reinterpret_cast<void**>(data+padded-4)); 609 *reinterpret_cast<uint32_t*>(data+padded-4) &= mask[padded-len]; 610 } 611 612 finishWrite(padded); 613 return data; 614 } 615 616 status_t err = growData(padded); 617 if (err == NO_ERROR) goto restart_write; 618 return NULL; 619} 620 621status_t Parcel::writeInt32(int32_t val) 622{ 623 return writeAligned(val); 624} 625status_t Parcel::writeInt32Array(size_t len, const int32_t *val) { 626 if (!val) { 627 return writeAligned(-1); 628 } 629 status_t ret = writeAligned(len); 630 if (ret == NO_ERROR) { 631 ret = write(val, len * sizeof(*val)); 632 } 633 return ret; 634} 635status_t Parcel::writeByteArray(size_t len, const uint8_t *val) { 636 if (!val) { 637 return writeAligned(-1); 638 } 639 status_t ret = writeAligned(len); 640 if (ret == NO_ERROR) { 641 ret = write(val, len * sizeof(*val)); 642 } 643 return ret; 644} 645 646status_t Parcel::writeInt64(int64_t val) 647{ 648 return writeAligned(val); 649} 650 651status_t Parcel::writePointer(uintptr_t val) 652{ 653 return writeAligned<binder_uintptr_t>(val); 654} 655 656status_t Parcel::writeFloat(float val) 657{ 658 return writeAligned(val); 659} 660 661#if defined(__mips__) && defined(__mips_hard_float) 662 663status_t Parcel::writeDouble(double val) 664{ 665 union { 666 double d; 667 unsigned long long ll; 668 } u; 669 u.d = val; 670 return writeAligned(u.ll); 671} 672 673#else 674 675status_t Parcel::writeDouble(double val) 676{ 677 return writeAligned(val); 678} 679 680#endif 681 682status_t Parcel::writeIntPtr(intptr_t val) 683{ 684 return writeAligned(val); 685} 686 687status_t Parcel::writeCString(const char* str) 688{ 689 return write(str, strlen(str)+1); 690} 691 692status_t Parcel::writeString8(const String8& str) 693{ 694 status_t err = writeInt32(str.bytes()); 695 // only write string if its length is more than zero characters, 696 // as readString8 will only read if the length field is non-zero. 697 // this is slightly different from how writeString16 works. 698 if (str.bytes() > 0 && err == NO_ERROR) { 699 err = write(str.string(), str.bytes()+1); 700 } 701 return err; 702} 703 704status_t Parcel::writeString16(const String16& str) 705{ 706 return writeString16(str.string(), str.size()); 707} 708 709status_t Parcel::writeString16(const char16_t* str, size_t len) 710{ 711 if (str == NULL) return writeInt32(-1); 712 713 status_t err = writeInt32(len); 714 if (err == NO_ERROR) { 715 len *= sizeof(char16_t); 716 uint8_t* data = (uint8_t*)writeInplace(len+sizeof(char16_t)); 717 if (data) { 718 memcpy(data, str, len); 719 *reinterpret_cast<char16_t*>(data+len) = 0; 720 return NO_ERROR; 721 } 722 err = mError; 723 } 724 return err; 725} 726 727status_t Parcel::writeStrongBinder(const sp<IBinder>& val) 728{ 729 return flatten_binder(ProcessState::self(), val, this); 730} 731 732status_t Parcel::writeWeakBinder(const wp<IBinder>& val) 733{ 734 return flatten_binder(ProcessState::self(), val, this); 735} 736 737status_t Parcel::writeNativeHandle(const native_handle* handle) 738{ 739 if (!handle || handle->version != sizeof(native_handle)) 740 return BAD_TYPE; 741 742 status_t err; 743 err = writeInt32(handle->numFds); 744 if (err != NO_ERROR) return err; 745 746 err = writeInt32(handle->numInts); 747 if (err != NO_ERROR) return err; 748 749 for (int i=0 ; err==NO_ERROR && i<handle->numFds ; i++) 750 err = writeDupFileDescriptor(handle->data[i]); 751 752 if (err != NO_ERROR) { 753 ALOGD("write native handle, write dup fd failed"); 754 return err; 755 } 756 err = write(handle->data + handle->numFds, sizeof(int)*handle->numInts); 757 return err; 758} 759 760status_t Parcel::writeFileDescriptor(int fd, bool takeOwnership) 761{ 762 flat_binder_object obj; 763 obj.type = BINDER_TYPE_FD; 764 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 765 obj.binder = 0; /* Don't pass uninitialized stack data to a remote process */ 766 obj.handle = fd; 767 obj.cookie = takeOwnership ? 1 : 0; 768 return writeObject(obj, true); 769} 770 771status_t Parcel::writeDupFileDescriptor(int fd) 772{ 773 int dupFd = dup(fd); 774 if (dupFd < 0) { 775 return -errno; 776 } 777 status_t err = writeFileDescriptor(dupFd, true /*takeOwnership*/); 778 if (err) { 779 close(dupFd); 780 } 781 return err; 782} 783 784status_t Parcel::writeBlob(size_t len, WritableBlob* outBlob) 785{ 786 status_t status; 787 788 if (!mAllowFds || len <= IN_PLACE_BLOB_LIMIT) { 789 ALOGV("writeBlob: write in place"); 790 status = writeInt32(0); 791 if (status) return status; 792 793 void* ptr = writeInplace(len); 794 if (!ptr) return NO_MEMORY; 795 796 outBlob->init(false /*mapped*/, ptr, len); 797 return NO_ERROR; 798 } 799 800 ALOGV("writeBlob: write to ashmem"); 801 int fd = ashmem_create_region("Parcel Blob", len); 802 if (fd < 0) return NO_MEMORY; 803 804 int result = ashmem_set_prot_region(fd, PROT_READ | PROT_WRITE); 805 if (result < 0) { 806 status = result; 807 } else { 808 void* ptr = ::mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); 809 if (ptr == MAP_FAILED) { 810 status = -errno; 811 } else { 812 result = ashmem_set_prot_region(fd, PROT_READ); 813 if (result < 0) { 814 status = result; 815 } else { 816 status = writeInt32(1); 817 if (!status) { 818 status = writeFileDescriptor(fd, true /*takeOwnership*/); 819 if (!status) { 820 outBlob->init(true /*mapped*/, ptr, len); 821 return NO_ERROR; 822 } 823 } 824 } 825 } 826 ::munmap(ptr, len); 827 } 828 ::close(fd); 829 return status; 830} 831 832status_t Parcel::write(const FlattenableHelperInterface& val) 833{ 834 status_t err; 835 836 // size if needed 837 const size_t len = val.getFlattenedSize(); 838 const size_t fd_count = val.getFdCount(); 839 840 err = this->writeInt32(len); 841 if (err) return err; 842 843 err = this->writeInt32(fd_count); 844 if (err) return err; 845 846 // payload 847 void* const buf = this->writeInplace(PAD_SIZE(len)); 848 if (buf == NULL) 849 return BAD_VALUE; 850 851 int* fds = NULL; 852 if (fd_count) { 853 fds = new int[fd_count]; 854 } 855 856 err = val.flatten(buf, len, fds, fd_count); 857 for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) { 858 err = this->writeDupFileDescriptor( fds[i] ); 859 } 860 861 if (fd_count) { 862 delete [] fds; 863 } 864 865 return err; 866} 867 868status_t Parcel::writeObject(const flat_binder_object& val, bool nullMetaData) 869{ 870 const bool enoughData = (mDataPos+sizeof(val)) <= mDataCapacity; 871 const bool enoughObjects = mObjectsSize < mObjectsCapacity; 872 if (enoughData && enoughObjects) { 873restart_write: 874 *reinterpret_cast<flat_binder_object*>(mData+mDataPos) = val; 875 876 // Need to write meta-data? 877 if (nullMetaData || val.binder != 0) { 878 mObjects[mObjectsSize] = mDataPos; 879 acquire_object(ProcessState::self(), val, this); 880 mObjectsSize++; 881 } 882 883 // remember if it's a file descriptor 884 if (val.type == BINDER_TYPE_FD) { 885 if (!mAllowFds) { 886 return FDS_NOT_ALLOWED; 887 } 888 mHasFds = mFdsKnown = true; 889 } 890 891 return finishWrite(sizeof(flat_binder_object)); 892 } 893 894 if (!enoughData) { 895 const status_t err = growData(sizeof(val)); 896 if (err != NO_ERROR) return err; 897 } 898 if (!enoughObjects) { 899 size_t newSize = ((mObjectsSize+2)*3)/2; 900 binder_size_t* objects = (binder_size_t*)realloc(mObjects, newSize*sizeof(binder_size_t)); 901 if (objects == NULL) return NO_MEMORY; 902 mObjects = objects; 903 mObjectsCapacity = newSize; 904 } 905 906 goto restart_write; 907} 908 909status_t Parcel::writeNoException() 910{ 911 return writeInt32(0); 912} 913 914void Parcel::remove(size_t /*start*/, size_t /*amt*/) 915{ 916 LOG_ALWAYS_FATAL("Parcel::remove() not yet implemented!"); 917} 918 919status_t Parcel::read(void* outData, size_t len) const 920{ 921 if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize 922 && len <= PAD_SIZE(len)) { 923 memcpy(outData, mData+mDataPos, len); 924 mDataPos += PAD_SIZE(len); 925 ALOGV("read Setting data pos of %p to %zu", this, mDataPos); 926 return NO_ERROR; 927 } 928 return NOT_ENOUGH_DATA; 929} 930 931const void* Parcel::readInplace(size_t len) const 932{ 933 if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize 934 && len <= PAD_SIZE(len)) { 935 const void* data = mData+mDataPos; 936 mDataPos += PAD_SIZE(len); 937 ALOGV("readInplace Setting data pos of %p to %zu", this, mDataPos); 938 return data; 939 } 940 return NULL; 941} 942 943template<class T> 944status_t Parcel::readAligned(T *pArg) const { 945 COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T)); 946 947 if ((mDataPos+sizeof(T)) <= mDataSize) { 948 const void* data = mData+mDataPos; 949 mDataPos += sizeof(T); 950 *pArg = *reinterpret_cast<const T*>(data); 951 return NO_ERROR; 952 } else { 953 return NOT_ENOUGH_DATA; 954 } 955} 956 957template<class T> 958T Parcel::readAligned() const { 959 T result; 960 if (readAligned(&result) != NO_ERROR) { 961 result = 0; 962 } 963 964 return result; 965} 966 967template<class T> 968status_t Parcel::writeAligned(T val) { 969 COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T)); 970 971 if ((mDataPos+sizeof(val)) <= mDataCapacity) { 972restart_write: 973 *reinterpret_cast<T*>(mData+mDataPos) = val; 974 return finishWrite(sizeof(val)); 975 } 976 977 status_t err = growData(sizeof(val)); 978 if (err == NO_ERROR) goto restart_write; 979 return err; 980} 981 982status_t Parcel::readInt32(int32_t *pArg) const 983{ 984 return readAligned(pArg); 985} 986 987int32_t Parcel::readInt32() const 988{ 989 return readAligned<int32_t>(); 990} 991 992 993status_t Parcel::readInt64(int64_t *pArg) const 994{ 995 return readAligned(pArg); 996} 997 998 999int64_t Parcel::readInt64() const 1000{ 1001 return readAligned<int64_t>(); 1002} 1003 1004status_t Parcel::readPointer(uintptr_t *pArg) const 1005{ 1006 status_t ret; 1007 binder_uintptr_t ptr; 1008 ret = readAligned(&ptr); 1009 if (!ret) 1010 *pArg = ptr; 1011 return ret; 1012} 1013 1014uintptr_t Parcel::readPointer() const 1015{ 1016 return readAligned<binder_uintptr_t>(); 1017} 1018 1019 1020status_t Parcel::readFloat(float *pArg) const 1021{ 1022 return readAligned(pArg); 1023} 1024 1025 1026float Parcel::readFloat() const 1027{ 1028 return readAligned<float>(); 1029} 1030 1031#if defined(__mips__) && defined(__mips_hard_float) 1032 1033status_t Parcel::readDouble(double *pArg) const 1034{ 1035 union { 1036 double d; 1037 unsigned long long ll; 1038 } u; 1039 status_t status; 1040 status = readAligned(&u.ll); 1041 *pArg = u.d; 1042 return status; 1043} 1044 1045double Parcel::readDouble() const 1046{ 1047 union { 1048 double d; 1049 unsigned long long ll; 1050 } u; 1051 u.ll = readAligned<unsigned long long>(); 1052 return u.d; 1053} 1054 1055#else 1056 1057status_t Parcel::readDouble(double *pArg) const 1058{ 1059 return readAligned(pArg); 1060} 1061 1062double Parcel::readDouble() const 1063{ 1064 return readAligned<double>(); 1065} 1066 1067#endif 1068 1069status_t Parcel::readIntPtr(intptr_t *pArg) const 1070{ 1071 return readAligned(pArg); 1072} 1073 1074 1075intptr_t Parcel::readIntPtr() const 1076{ 1077 return readAligned<intptr_t>(); 1078} 1079 1080 1081const char* Parcel::readCString() const 1082{ 1083 const size_t avail = mDataSize-mDataPos; 1084 if (avail > 0) { 1085 const char* str = reinterpret_cast<const char*>(mData+mDataPos); 1086 // is the string's trailing NUL within the parcel's valid bounds? 1087 const char* eos = reinterpret_cast<const char*>(memchr(str, 0, avail)); 1088 if (eos) { 1089 const size_t len = eos - str; 1090 mDataPos += PAD_SIZE(len+1); 1091 ALOGV("readCString Setting data pos of %p to %zu", this, mDataPos); 1092 return str; 1093 } 1094 } 1095 return NULL; 1096} 1097 1098String8 Parcel::readString8() const 1099{ 1100 int32_t size = readInt32(); 1101 // watch for potential int overflow adding 1 for trailing NUL 1102 if (size > 0 && size < INT32_MAX) { 1103 const char* str = (const char*)readInplace(size+1); 1104 if (str) return String8(str, size); 1105 } 1106 return String8(); 1107} 1108 1109String16 Parcel::readString16() const 1110{ 1111 size_t len; 1112 const char16_t* str = readString16Inplace(&len); 1113 if (str) return String16(str, len); 1114 ALOGE("Reading a NULL string not supported here."); 1115 return String16(); 1116} 1117 1118const char16_t* Parcel::readString16Inplace(size_t* outLen) const 1119{ 1120 int32_t size = readInt32(); 1121 // watch for potential int overflow from size+1 1122 if (size >= 0 && size < INT32_MAX) { 1123 *outLen = size; 1124 const char16_t* str = (const char16_t*)readInplace((size+1)*sizeof(char16_t)); 1125 if (str != NULL) { 1126 return str; 1127 } 1128 } 1129 *outLen = 0; 1130 return NULL; 1131} 1132 1133sp<IBinder> Parcel::readStrongBinder() const 1134{ 1135 sp<IBinder> val; 1136 unflatten_binder(ProcessState::self(), *this, &val); 1137 return val; 1138} 1139 1140wp<IBinder> Parcel::readWeakBinder() const 1141{ 1142 wp<IBinder> val; 1143 unflatten_binder(ProcessState::self(), *this, &val); 1144 return val; 1145} 1146 1147int32_t Parcel::readExceptionCode() const 1148{ 1149 int32_t exception_code = readAligned<int32_t>(); 1150 if (exception_code == EX_HAS_REPLY_HEADER) { 1151 int32_t header_start = dataPosition(); 1152 int32_t header_size = readAligned<int32_t>(); 1153 // Skip over fat responses headers. Not used (or propagated) in 1154 // native code 1155 setDataPosition(header_start + header_size); 1156 // And fat response headers are currently only used when there are no 1157 // exceptions, so return no error: 1158 return 0; 1159 } 1160 return exception_code; 1161} 1162 1163native_handle* Parcel::readNativeHandle() const 1164{ 1165 int numFds, numInts; 1166 status_t err; 1167 err = readInt32(&numFds); 1168 if (err != NO_ERROR) return 0; 1169 err = readInt32(&numInts); 1170 if (err != NO_ERROR) return 0; 1171 1172 native_handle* h = native_handle_create(numFds, numInts); 1173 for (int i=0 ; err==NO_ERROR && i<numFds ; i++) { 1174 h->data[i] = dup(readFileDescriptor()); 1175 if (h->data[i] < 0) err = BAD_VALUE; 1176 } 1177 err = read(h->data + numFds, sizeof(int)*numInts); 1178 if (err != NO_ERROR) { 1179 native_handle_close(h); 1180 native_handle_delete(h); 1181 h = 0; 1182 } 1183 return h; 1184} 1185 1186 1187int Parcel::readFileDescriptor() const 1188{ 1189 const flat_binder_object* flat = readObject(true); 1190 if (flat) { 1191 switch (flat->type) { 1192 case BINDER_TYPE_FD: 1193 //ALOGI("Returning file descriptor %ld from parcel %p", flat->handle, this); 1194 return flat->handle; 1195 } 1196 } 1197 return BAD_TYPE; 1198} 1199 1200status_t Parcel::readBlob(size_t len, ReadableBlob* outBlob) const 1201{ 1202 int32_t useAshmem; 1203 status_t status = readInt32(&useAshmem); 1204 if (status) return status; 1205 1206 if (!useAshmem) { 1207 ALOGV("readBlob: read in place"); 1208 const void* ptr = readInplace(len); 1209 if (!ptr) return BAD_VALUE; 1210 1211 outBlob->init(false /*mapped*/, const_cast<void*>(ptr), len); 1212 return NO_ERROR; 1213 } 1214 1215 ALOGV("readBlob: read from ashmem"); 1216 int fd = readFileDescriptor(); 1217 if (fd == int(BAD_TYPE)) return BAD_VALUE; 1218 1219 void* ptr = ::mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0); 1220 if (!ptr) return NO_MEMORY; 1221 1222 outBlob->init(true /*mapped*/, ptr, len); 1223 return NO_ERROR; 1224} 1225 1226status_t Parcel::read(FlattenableHelperInterface& val) const 1227{ 1228 // size 1229 const size_t len = this->readInt32(); 1230 const size_t fd_count = this->readInt32(); 1231 1232 // payload 1233 void const* const buf = this->readInplace(PAD_SIZE(len)); 1234 if (buf == NULL) 1235 return BAD_VALUE; 1236 1237 int* fds = NULL; 1238 if (fd_count) { 1239 fds = new int[fd_count]; 1240 } 1241 1242 status_t err = NO_ERROR; 1243 for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) { 1244 fds[i] = dup(this->readFileDescriptor()); 1245 if (fds[i] < 0) { 1246 err = BAD_VALUE; 1247 ALOGE("dup() failed in Parcel::read, i is %zu, fds[i] is %d, fd_count is %zu, error: %s", 1248 i, fds[i], fd_count, strerror(errno)); 1249 } 1250 } 1251 1252 if (err == NO_ERROR) { 1253 err = val.unflatten(buf, len, fds, fd_count); 1254 } 1255 1256 if (fd_count) { 1257 delete [] fds; 1258 } 1259 1260 return err; 1261} 1262const flat_binder_object* Parcel::readObject(bool nullMetaData) const 1263{ 1264 const size_t DPOS = mDataPos; 1265 if ((DPOS+sizeof(flat_binder_object)) <= mDataSize) { 1266 const flat_binder_object* obj 1267 = reinterpret_cast<const flat_binder_object*>(mData+DPOS); 1268 mDataPos = DPOS + sizeof(flat_binder_object); 1269 if (!nullMetaData && (obj->cookie == 0 && obj->binder == 0)) { 1270 // When transferring a NULL object, we don't write it into 1271 // the object list, so we don't want to check for it when 1272 // reading. 1273 ALOGV("readObject Setting data pos of %p to %zu", this, mDataPos); 1274 return obj; 1275 } 1276 1277 // Ensure that this object is valid... 1278 binder_size_t* const OBJS = mObjects; 1279 const size_t N = mObjectsSize; 1280 size_t opos = mNextObjectHint; 1281 1282 if (N > 0) { 1283 ALOGV("Parcel %p looking for obj at %zu, hint=%zu", 1284 this, DPOS, opos); 1285 1286 // Start at the current hint position, looking for an object at 1287 // the current data position. 1288 if (opos < N) { 1289 while (opos < (N-1) && OBJS[opos] < DPOS) { 1290 opos++; 1291 } 1292 } else { 1293 opos = N-1; 1294 } 1295 if (OBJS[opos] == DPOS) { 1296 // Found it! 1297 ALOGV("Parcel %p found obj %zu at index %zu with forward search", 1298 this, DPOS, opos); 1299 mNextObjectHint = opos+1; 1300 ALOGV("readObject Setting data pos of %p to %zu", this, mDataPos); 1301 return obj; 1302 } 1303 1304 // Look backwards for it... 1305 while (opos > 0 && OBJS[opos] > DPOS) { 1306 opos--; 1307 } 1308 if (OBJS[opos] == DPOS) { 1309 // Found it! 1310 ALOGV("Parcel %p found obj %zu at index %zu with backward search", 1311 this, DPOS, opos); 1312 mNextObjectHint = opos+1; 1313 ALOGV("readObject Setting data pos of %p to %zu", this, mDataPos); 1314 return obj; 1315 } 1316 } 1317 ALOGW("Attempt to read object from Parcel %p at offset %zu that is not in the object list", 1318 this, DPOS); 1319 } 1320 return NULL; 1321} 1322 1323void Parcel::closeFileDescriptors() 1324{ 1325 size_t i = mObjectsSize; 1326 if (i > 0) { 1327 //ALOGI("Closing file descriptors for %zu objects...", i); 1328 } 1329 while (i > 0) { 1330 i--; 1331 const flat_binder_object* flat 1332 = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]); 1333 if (flat->type == BINDER_TYPE_FD) { 1334 //ALOGI("Closing fd: %ld", flat->handle); 1335 close(flat->handle); 1336 } 1337 } 1338} 1339 1340uintptr_t Parcel::ipcData() const 1341{ 1342 return reinterpret_cast<uintptr_t>(mData); 1343} 1344 1345size_t Parcel::ipcDataSize() const 1346{ 1347 return (mDataSize > mDataPos ? mDataSize : mDataPos); 1348} 1349 1350uintptr_t Parcel::ipcObjects() const 1351{ 1352 return reinterpret_cast<uintptr_t>(mObjects); 1353} 1354 1355size_t Parcel::ipcObjectsCount() const 1356{ 1357 return mObjectsSize; 1358} 1359 1360void Parcel::ipcSetDataReference(const uint8_t* data, size_t dataSize, 1361 const binder_size_t* objects, size_t objectsCount, release_func relFunc, void* relCookie) 1362{ 1363 binder_size_t minOffset = 0; 1364 freeDataNoInit(); 1365 mError = NO_ERROR; 1366 mData = const_cast<uint8_t*>(data); 1367 mDataSize = mDataCapacity = dataSize; 1368 //ALOGI("setDataReference Setting data size of %p to %lu (pid=%d)", this, mDataSize, getpid()); 1369 mDataPos = 0; 1370 ALOGV("setDataReference Setting data pos of %p to %zu", this, mDataPos); 1371 mObjects = const_cast<binder_size_t*>(objects); 1372 mObjectsSize = mObjectsCapacity = objectsCount; 1373 mNextObjectHint = 0; 1374 mOwner = relFunc; 1375 mOwnerCookie = relCookie; 1376 for (size_t i = 0; i < mObjectsSize; i++) { 1377 binder_size_t offset = mObjects[i]; 1378 if (offset < minOffset) { 1379 ALOGE("%s: bad object offset %"PRIu64" < %"PRIu64"\n", 1380 __func__, (uint64_t)offset, (uint64_t)minOffset); 1381 mObjectsSize = 0; 1382 break; 1383 } 1384 minOffset = offset + sizeof(flat_binder_object); 1385 } 1386 scanForFds(); 1387} 1388 1389void Parcel::print(TextOutput& to, uint32_t /*flags*/) const 1390{ 1391 to << "Parcel("; 1392 1393 if (errorCheck() != NO_ERROR) { 1394 const status_t err = errorCheck(); 1395 to << "Error: " << (void*)(intptr_t)err << " \"" << strerror(-err) << "\""; 1396 } else if (dataSize() > 0) { 1397 const uint8_t* DATA = data(); 1398 to << indent << HexDump(DATA, dataSize()) << dedent; 1399 const binder_size_t* OBJS = objects(); 1400 const size_t N = objectsCount(); 1401 for (size_t i=0; i<N; i++) { 1402 const flat_binder_object* flat 1403 = reinterpret_cast<const flat_binder_object*>(DATA+OBJS[i]); 1404 to << endl << "Object #" << i << " @ " << (void*)OBJS[i] << ": " 1405 << TypeCode(flat->type & 0x7f7f7f00) 1406 << " = " << flat->binder; 1407 } 1408 } else { 1409 to << "NULL"; 1410 } 1411 1412 to << ")"; 1413} 1414 1415void Parcel::releaseObjects() 1416{ 1417 const sp<ProcessState> proc(ProcessState::self()); 1418 size_t i = mObjectsSize; 1419 uint8_t* const data = mData; 1420 binder_size_t* const objects = mObjects; 1421 while (i > 0) { 1422 i--; 1423 const flat_binder_object* flat 1424 = reinterpret_cast<flat_binder_object*>(data+objects[i]); 1425 release_object(proc, *flat, this); 1426 } 1427} 1428 1429void Parcel::acquireObjects() 1430{ 1431 const sp<ProcessState> proc(ProcessState::self()); 1432 size_t i = mObjectsSize; 1433 uint8_t* const data = mData; 1434 binder_size_t* const objects = mObjects; 1435 while (i > 0) { 1436 i--; 1437 const flat_binder_object* flat 1438 = reinterpret_cast<flat_binder_object*>(data+objects[i]); 1439 acquire_object(proc, *flat, this); 1440 } 1441} 1442 1443void Parcel::freeData() 1444{ 1445 freeDataNoInit(); 1446 initState(); 1447} 1448 1449void Parcel::freeDataNoInit() 1450{ 1451 if (mOwner) { 1452 //ALOGI("Freeing data ref of %p (pid=%d)", this, getpid()); 1453 mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie); 1454 } else { 1455 releaseObjects(); 1456 if (mData) free(mData); 1457 if (mObjects) free(mObjects); 1458 } 1459} 1460 1461status_t Parcel::growData(size_t len) 1462{ 1463 size_t newSize = ((mDataSize+len)*3)/2; 1464 return (newSize <= mDataSize) 1465 ? (status_t) NO_MEMORY 1466 : continueWrite(newSize); 1467} 1468 1469status_t Parcel::restartWrite(size_t desired) 1470{ 1471 if (mOwner) { 1472 freeData(); 1473 return continueWrite(desired); 1474 } 1475 1476 uint8_t* data = (uint8_t*)realloc(mData, desired); 1477 if (!data && desired > mDataCapacity) { 1478 mError = NO_MEMORY; 1479 return NO_MEMORY; 1480 } 1481 1482 releaseObjects(); 1483 1484 if (data) { 1485 mData = data; 1486 mDataCapacity = desired; 1487 } 1488 1489 mDataSize = mDataPos = 0; 1490 ALOGV("restartWrite Setting data size of %p to %zu", this, mDataSize); 1491 ALOGV("restartWrite Setting data pos of %p to %zu", this, mDataPos); 1492 1493 free(mObjects); 1494 mObjects = NULL; 1495 mObjectsSize = mObjectsCapacity = 0; 1496 mNextObjectHint = 0; 1497 mHasFds = false; 1498 mFdsKnown = true; 1499 mAllowFds = true; 1500 1501 return NO_ERROR; 1502} 1503 1504status_t Parcel::continueWrite(size_t desired) 1505{ 1506 // If shrinking, first adjust for any objects that appear 1507 // after the new data size. 1508 size_t objectsSize = mObjectsSize; 1509 if (desired < mDataSize) { 1510 if (desired == 0) { 1511 objectsSize = 0; 1512 } else { 1513 while (objectsSize > 0) { 1514 if (mObjects[objectsSize-1] < desired) 1515 break; 1516 objectsSize--; 1517 } 1518 } 1519 } 1520 1521 if (mOwner) { 1522 // If the size is going to zero, just release the owner's data. 1523 if (desired == 0) { 1524 freeData(); 1525 return NO_ERROR; 1526 } 1527 1528 // If there is a different owner, we need to take 1529 // posession. 1530 uint8_t* data = (uint8_t*)malloc(desired); 1531 if (!data) { 1532 mError = NO_MEMORY; 1533 return NO_MEMORY; 1534 } 1535 binder_size_t* objects = NULL; 1536 1537 if (objectsSize) { 1538 objects = (binder_size_t*)malloc(objectsSize*sizeof(binder_size_t)); 1539 if (!objects) { 1540 free(data); 1541 1542 mError = NO_MEMORY; 1543 return NO_MEMORY; 1544 } 1545 1546 // Little hack to only acquire references on objects 1547 // we will be keeping. 1548 size_t oldObjectsSize = mObjectsSize; 1549 mObjectsSize = objectsSize; 1550 acquireObjects(); 1551 mObjectsSize = oldObjectsSize; 1552 } 1553 1554 if (mData) { 1555 memcpy(data, mData, mDataSize < desired ? mDataSize : desired); 1556 } 1557 if (objects && mObjects) { 1558 memcpy(objects, mObjects, objectsSize*sizeof(binder_size_t)); 1559 } 1560 //ALOGI("Freeing data ref of %p (pid=%d)", this, getpid()); 1561 mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie); 1562 mOwner = NULL; 1563 1564 mData = data; 1565 mObjects = objects; 1566 mDataSize = (mDataSize < desired) ? mDataSize : desired; 1567 ALOGV("continueWrite Setting data size of %p to %zu", this, mDataSize); 1568 mDataCapacity = desired; 1569 mObjectsSize = mObjectsCapacity = objectsSize; 1570 mNextObjectHint = 0; 1571 1572 } else if (mData) { 1573 if (objectsSize < mObjectsSize) { 1574 // Need to release refs on any objects we are dropping. 1575 const sp<ProcessState> proc(ProcessState::self()); 1576 for (size_t i=objectsSize; i<mObjectsSize; i++) { 1577 const flat_binder_object* flat 1578 = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]); 1579 if (flat->type == BINDER_TYPE_FD) { 1580 // will need to rescan because we may have lopped off the only FDs 1581 mFdsKnown = false; 1582 } 1583 release_object(proc, *flat, this); 1584 } 1585 binder_size_t* objects = 1586 (binder_size_t*)realloc(mObjects, objectsSize*sizeof(binder_size_t)); 1587 if (objects) { 1588 mObjects = objects; 1589 } 1590 mObjectsSize = objectsSize; 1591 mNextObjectHint = 0; 1592 } 1593 1594 // We own the data, so we can just do a realloc(). 1595 if (desired > mDataCapacity) { 1596 uint8_t* data = (uint8_t*)realloc(mData, desired); 1597 if (data) { 1598 mData = data; 1599 mDataCapacity = desired; 1600 } else if (desired > mDataCapacity) { 1601 mError = NO_MEMORY; 1602 return NO_MEMORY; 1603 } 1604 } else { 1605 if (mDataSize > desired) { 1606 mDataSize = desired; 1607 ALOGV("continueWrite Setting data size of %p to %zu", this, mDataSize); 1608 } 1609 if (mDataPos > desired) { 1610 mDataPos = desired; 1611 ALOGV("continueWrite Setting data pos of %p to %zu", this, mDataPos); 1612 } 1613 } 1614 1615 } else { 1616 // This is the first data. Easy! 1617 uint8_t* data = (uint8_t*)malloc(desired); 1618 if (!data) { 1619 mError = NO_MEMORY; 1620 return NO_MEMORY; 1621 } 1622 1623 if(!(mDataCapacity == 0 && mObjects == NULL 1624 && mObjectsCapacity == 0)) { 1625 ALOGE("continueWrite: %zu/%p/%zu/%zu", mDataCapacity, mObjects, mObjectsCapacity, desired); 1626 } 1627 1628 mData = data; 1629 mDataSize = mDataPos = 0; 1630 ALOGV("continueWrite Setting data size of %p to %zu", this, mDataSize); 1631 ALOGV("continueWrite Setting data pos of %p to %zu", this, mDataPos); 1632 mDataCapacity = desired; 1633 } 1634 1635 return NO_ERROR; 1636} 1637 1638void Parcel::initState() 1639{ 1640 mError = NO_ERROR; 1641 mData = 0; 1642 mDataSize = 0; 1643 mDataCapacity = 0; 1644 mDataPos = 0; 1645 ALOGV("initState Setting data size of %p to %zu", this, mDataSize); 1646 ALOGV("initState Setting data pos of %p to %zu", this, mDataPos); 1647 mObjects = NULL; 1648 mObjectsSize = 0; 1649 mObjectsCapacity = 0; 1650 mNextObjectHint = 0; 1651 mHasFds = false; 1652 mFdsKnown = true; 1653 mAllowFds = true; 1654 mOwner = NULL; 1655} 1656 1657void Parcel::scanForFds() const 1658{ 1659 bool hasFds = false; 1660 for (size_t i=0; i<mObjectsSize; i++) { 1661 const flat_binder_object* flat 1662 = reinterpret_cast<const flat_binder_object*>(mData + mObjects[i]); 1663 if (flat->type == BINDER_TYPE_FD) { 1664 hasFds = true; 1665 break; 1666 } 1667 } 1668 mHasFds = hasFds; 1669 mFdsKnown = true; 1670} 1671 1672// --- Parcel::Blob --- 1673 1674Parcel::Blob::Blob() : 1675 mMapped(false), mData(NULL), mSize(0) { 1676} 1677 1678Parcel::Blob::~Blob() { 1679 release(); 1680} 1681 1682void Parcel::Blob::release() { 1683 if (mMapped && mData) { 1684 ::munmap(mData, mSize); 1685 } 1686 clear(); 1687} 1688 1689void Parcel::Blob::init(bool mapped, void* data, size_t size) { 1690 mMapped = mapped; 1691 mData = data; 1692 mSize = size; 1693} 1694 1695void Parcel::Blob::clear() { 1696 mMapped = false; 1697 mData = NULL; 1698 mSize = 0; 1699} 1700 1701}; // namespace android 1702