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 #ifndef ANDROID_PARCEL_H 18 #define ANDROID_PARCEL_H 19 20 #include <string> 21 #include <vector> 22 23 #include <android-base/unique_fd.h> 24 #include <cutils/native_handle.h> 25 #include <utils/Errors.h> 26 #include <utils/RefBase.h> 27 #include <utils/String16.h> 28 #include <utils/Vector.h> 29 #include <utils/Flattenable.h> 30 #include <linux/android/binder.h> 31 32 #include <binder/IInterface.h> 33 #include <binder/Parcelable.h> 34 #include <binder/Map.h> 35 36 // --------------------------------------------------------------------------- 37 namespace android { 38 39 template <typename T> class Flattenable; 40 template <typename T> class LightFlattenable; 41 class IBinder; 42 class IPCThreadState; 43 class ProcessState; 44 class String8; 45 class TextOutput; 46 47 namespace binder { 48 class Value; 49 }; 50 51 class Parcel { 52 friend class IPCThreadState; 53 public: 54 class ReadableBlob; 55 class WritableBlob; 56 57 Parcel(); 58 ~Parcel(); 59 60 const uint8_t* data() const; 61 size_t dataSize() const; 62 size_t dataAvail() const; 63 size_t dataPosition() const; 64 size_t dataCapacity() const; 65 66 status_t setDataSize(size_t size); 67 void setDataPosition(size_t pos) const; 68 status_t setDataCapacity(size_t size); 69 70 status_t setData(const uint8_t* buffer, size_t len); 71 72 status_t appendFrom(const Parcel *parcel, 73 size_t start, size_t len); 74 75 int compareData(const Parcel& other); 76 77 bool allowFds() const; 78 bool pushAllowFds(bool allowFds); 79 void restoreAllowFds(bool lastValue); 80 81 bool hasFileDescriptors() const; 82 83 // Writes the RPC header. 84 status_t writeInterfaceToken(const String16& interface); 85 86 // Parses the RPC header, returning true if the interface name 87 // in the header matches the expected interface from the caller. 88 // 89 // Additionally, enforceInterface does part of the work of 90 // propagating the StrictMode policy mask, populating the current 91 // IPCThreadState, which as an optimization may optionally be 92 // passed in. 93 bool enforceInterface(const String16& interface, 94 IPCThreadState* threadState = NULL) const; 95 bool checkInterface(IBinder*) const; 96 97 void freeData(); 98 99 private: 100 const binder_size_t* objects() const; 101 102 public: 103 size_t objectsCount() const; 104 105 status_t errorCheck() const; 106 void setError(status_t err); 107 108 status_t write(const void* data, size_t len); 109 void* writeInplace(size_t len); 110 status_t writeUnpadded(const void* data, size_t len); 111 status_t writeInt32(int32_t val); 112 status_t writeUint32(uint32_t val); 113 status_t writeInt64(int64_t val); 114 status_t writeUint64(uint64_t val); 115 status_t writeFloat(float val); 116 status_t writeDouble(double val); 117 status_t writeCString(const char* str); 118 status_t writeString8(const String8& str); 119 status_t writeString16(const String16& str); 120 status_t writeString16(const std::unique_ptr<String16>& str); 121 status_t writeString16(const char16_t* str, size_t len); 122 status_t writeStrongBinder(const sp<IBinder>& val); 123 status_t writeWeakBinder(const wp<IBinder>& val); 124 status_t writeInt32Array(size_t len, const int32_t *val); 125 status_t writeByteArray(size_t len, const uint8_t *val); 126 status_t writeBool(bool val); 127 status_t writeChar(char16_t val); 128 status_t writeByte(int8_t val); 129 130 // Take a UTF8 encoded string, convert to UTF16, write it to the parcel. 131 status_t writeUtf8AsUtf16(const std::string& str); 132 status_t writeUtf8AsUtf16(const std::unique_ptr<std::string>& str); 133 134 status_t writeByteVector(const std::unique_ptr<std::vector<int8_t>>& val); 135 status_t writeByteVector(const std::vector<int8_t>& val); 136 status_t writeByteVector(const std::unique_ptr<std::vector<uint8_t>>& val); 137 status_t writeByteVector(const std::vector<uint8_t>& val); 138 status_t writeInt32Vector(const std::unique_ptr<std::vector<int32_t>>& val); 139 status_t writeInt32Vector(const std::vector<int32_t>& val); 140 status_t writeInt64Vector(const std::unique_ptr<std::vector<int64_t>>& val); 141 status_t writeInt64Vector(const std::vector<int64_t>& val); 142 status_t writeFloatVector(const std::unique_ptr<std::vector<float>>& val); 143 status_t writeFloatVector(const std::vector<float>& val); 144 status_t writeDoubleVector(const std::unique_ptr<std::vector<double>>& val); 145 status_t writeDoubleVector(const std::vector<double>& val); 146 status_t writeBoolVector(const std::unique_ptr<std::vector<bool>>& val); 147 status_t writeBoolVector(const std::vector<bool>& val); 148 status_t writeCharVector(const std::unique_ptr<std::vector<char16_t>>& val); 149 status_t writeCharVector(const std::vector<char16_t>& val); 150 status_t writeString16Vector( 151 const std::unique_ptr<std::vector<std::unique_ptr<String16>>>& val); 152 status_t writeString16Vector(const std::vector<String16>& val); 153 status_t writeUtf8VectorAsUtf16Vector( 154 const std::unique_ptr<std::vector<std::unique_ptr<std::string>>>& val); 155 status_t writeUtf8VectorAsUtf16Vector(const std::vector<std::string>& val); 156 157 status_t writeStrongBinderVector(const std::unique_ptr<std::vector<sp<IBinder>>>& val); 158 status_t writeStrongBinderVector(const std::vector<sp<IBinder>>& val); 159 160 template<typename T> 161 status_t writeParcelableVector(const std::unique_ptr<std::vector<std::unique_ptr<T>>>& val); 162 template<typename T> 163 status_t writeParcelableVector(const std::shared_ptr<std::vector<std::unique_ptr<T>>>& val); 164 template<typename T> 165 status_t writeParcelableVector(const std::vector<T>& val); 166 167 template<typename T> 168 status_t writeNullableParcelable(const std::unique_ptr<T>& parcelable); 169 170 status_t writeParcelable(const Parcelable& parcelable); 171 172 status_t writeValue(const binder::Value& value); 173 174 template<typename T> 175 status_t write(const Flattenable<T>& val); 176 177 template<typename T> 178 status_t write(const LightFlattenable<T>& val); 179 180 template<typename T> 181 status_t writeVectorSize(const std::vector<T>& val); 182 template<typename T> 183 status_t writeVectorSize(const std::unique_ptr<std::vector<T>>& val); 184 185 status_t writeMap(const binder::Map& map); 186 status_t writeNullableMap(const std::unique_ptr<binder::Map>& map); 187 188 // Place a native_handle into the parcel (the native_handle's file- 189 // descriptors are dup'ed, so it is safe to delete the native_handle 190 // when this function returns). 191 // Doesn't take ownership of the native_handle. 192 status_t writeNativeHandle(const native_handle* handle); 193 194 // Place a file descriptor into the parcel. The given fd must remain 195 // valid for the lifetime of the parcel. 196 // The Parcel does not take ownership of the given fd unless you ask it to. 197 status_t writeFileDescriptor(int fd, bool takeOwnership = false); 198 199 // Place a file descriptor into the parcel. A dup of the fd is made, which 200 // will be closed once the parcel is destroyed. 201 status_t writeDupFileDescriptor(int fd); 202 203 // Place a Java "parcel file descriptor" into the parcel. The given fd must remain 204 // valid for the lifetime of the parcel. 205 // The Parcel does not take ownership of the given fd unless you ask it to. 206 status_t writeParcelFileDescriptor(int fd, bool takeOwnership = false); 207 208 // Place a file descriptor into the parcel. This will not affect the 209 // semantics of the smart file descriptor. A new descriptor will be 210 // created, and will be closed when the parcel is destroyed. 211 status_t writeUniqueFileDescriptor( 212 const base::unique_fd& fd); 213 214 // Place a vector of file desciptors into the parcel. Each descriptor is 215 // dup'd as in writeDupFileDescriptor 216 status_t writeUniqueFileDescriptorVector( 217 const std::unique_ptr<std::vector<base::unique_fd>>& val); 218 status_t writeUniqueFileDescriptorVector( 219 const std::vector<base::unique_fd>& val); 220 221 // Writes a blob to the parcel. 222 // If the blob is small, then it is stored in-place, otherwise it is 223 // transferred by way of an anonymous shared memory region. Prefer sending 224 // immutable blobs if possible since they may be subsequently transferred between 225 // processes without further copying whereas mutable blobs always need to be copied. 226 // The caller should call release() on the blob after writing its contents. 227 status_t writeBlob(size_t len, bool mutableCopy, WritableBlob* outBlob); 228 229 // Write an existing immutable blob file descriptor to the parcel. 230 // This allows the client to send the same blob to multiple processes 231 // as long as it keeps a dup of the blob file descriptor handy for later. 232 status_t writeDupImmutableBlobFileDescriptor(int fd); 233 234 status_t writeObject(const flat_binder_object& val, bool nullMetaData); 235 236 // Like Parcel.java's writeNoException(). Just writes a zero int32. 237 // Currently the native implementation doesn't do any of the StrictMode 238 // stack gathering and serialization that the Java implementation does. 239 status_t writeNoException(); 240 241 void remove(size_t start, size_t amt); 242 243 status_t read(void* outData, size_t len) const; 244 const void* readInplace(size_t len) const; 245 int32_t readInt32() const; 246 status_t readInt32(int32_t *pArg) const; 247 uint32_t readUint32() const; 248 status_t readUint32(uint32_t *pArg) const; 249 int64_t readInt64() const; 250 status_t readInt64(int64_t *pArg) const; 251 uint64_t readUint64() const; 252 status_t readUint64(uint64_t *pArg) const; 253 float readFloat() const; 254 status_t readFloat(float *pArg) const; 255 double readDouble() const; 256 status_t readDouble(double *pArg) const; 257 intptr_t readIntPtr() const; 258 status_t readIntPtr(intptr_t *pArg) const; 259 bool readBool() const; 260 status_t readBool(bool *pArg) const; 261 char16_t readChar() const; 262 status_t readChar(char16_t *pArg) const; 263 int8_t readByte() const; 264 status_t readByte(int8_t *pArg) const; 265 266 // Read a UTF16 encoded string, convert to UTF8 267 status_t readUtf8FromUtf16(std::string* str) const; 268 status_t readUtf8FromUtf16(std::unique_ptr<std::string>* str) const; 269 270 const char* readCString() const; 271 String8 readString8() const; 272 status_t readString8(String8* pArg) const; 273 String16 readString16() const; 274 status_t readString16(String16* pArg) const; 275 status_t readString16(std::unique_ptr<String16>* pArg) const; 276 const char16_t* readString16Inplace(size_t* outLen) const; 277 sp<IBinder> readStrongBinder() const; 278 status_t readStrongBinder(sp<IBinder>* val) const; 279 status_t readNullableStrongBinder(sp<IBinder>* val) const; 280 wp<IBinder> readWeakBinder() const; 281 282 template<typename T> 283 status_t readParcelableVector( 284 std::unique_ptr<std::vector<std::unique_ptr<T>>>* val) const; 285 template<typename T> 286 status_t readParcelableVector(std::vector<T>* val) const; 287 288 status_t readParcelable(Parcelable* parcelable) const; 289 290 template<typename T> 291 status_t readParcelable(std::unique_ptr<T>* parcelable) const; 292 293 status_t readValue(binder::Value* value) const; 294 295 template<typename T> 296 status_t readStrongBinder(sp<T>* val) const; 297 298 template<typename T> 299 status_t readNullableStrongBinder(sp<T>* val) const; 300 301 status_t readStrongBinderVector(std::unique_ptr<std::vector<sp<IBinder>>>* val) const; 302 status_t readStrongBinderVector(std::vector<sp<IBinder>>* val) const; 303 304 status_t readByteVector(std::unique_ptr<std::vector<int8_t>>* val) const; 305 status_t readByteVector(std::vector<int8_t>* val) const; 306 status_t readByteVector(std::unique_ptr<std::vector<uint8_t>>* val) const; 307 status_t readByteVector(std::vector<uint8_t>* val) const; 308 status_t readInt32Vector(std::unique_ptr<std::vector<int32_t>>* val) const; 309 status_t readInt32Vector(std::vector<int32_t>* val) const; 310 status_t readInt64Vector(std::unique_ptr<std::vector<int64_t>>* val) const; 311 status_t readInt64Vector(std::vector<int64_t>* val) const; 312 status_t readFloatVector(std::unique_ptr<std::vector<float>>* val) const; 313 status_t readFloatVector(std::vector<float>* val) const; 314 status_t readDoubleVector(std::unique_ptr<std::vector<double>>* val) const; 315 status_t readDoubleVector(std::vector<double>* val) const; 316 status_t readBoolVector(std::unique_ptr<std::vector<bool>>* val) const; 317 status_t readBoolVector(std::vector<bool>* val) const; 318 status_t readCharVector(std::unique_ptr<std::vector<char16_t>>* val) const; 319 status_t readCharVector(std::vector<char16_t>* val) const; 320 status_t readString16Vector( 321 std::unique_ptr<std::vector<std::unique_ptr<String16>>>* val) const; 322 status_t readString16Vector(std::vector<String16>* val) const; 323 status_t readUtf8VectorFromUtf16Vector( 324 std::unique_ptr<std::vector<std::unique_ptr<std::string>>>* val) const; 325 status_t readUtf8VectorFromUtf16Vector(std::vector<std::string>* val) const; 326 327 template<typename T> 328 status_t read(Flattenable<T>& val) const; 329 330 template<typename T> 331 status_t read(LightFlattenable<T>& val) const; 332 333 template<typename T> 334 status_t resizeOutVector(std::vector<T>* val) const; 335 template<typename T> 336 status_t resizeOutVector(std::unique_ptr<std::vector<T>>* val) const; 337 338 status_t readMap(binder::Map* map)const; 339 status_t readNullableMap(std::unique_ptr<binder::Map>* map) const; 340 341 // Like Parcel.java's readExceptionCode(). Reads the first int32 342 // off of a Parcel's header, returning 0 or the negative error 343 // code on exceptions, but also deals with skipping over rich 344 // response headers. Callers should use this to read & parse the 345 // response headers rather than doing it by hand. 346 int32_t readExceptionCode() const; 347 348 // Retrieve native_handle from the parcel. This returns a copy of the 349 // parcel's native_handle (the caller takes ownership). The caller 350 // must free the native_handle with native_handle_close() and 351 // native_handle_delete(). 352 native_handle* readNativeHandle() const; 353 354 355 // Retrieve a file descriptor from the parcel. This returns the raw fd 356 // in the parcel, which you do not own -- use dup() to get your own copy. 357 int readFileDescriptor() const; 358 359 // Retrieve a Java "parcel file descriptor" from the parcel. This returns the raw fd 360 // in the parcel, which you do not own -- use dup() to get your own copy. 361 int readParcelFileDescriptor() const; 362 363 // Retrieve a smart file descriptor from the parcel. 364 status_t readUniqueFileDescriptor( 365 base::unique_fd* val) const; 366 367 368 // Retrieve a vector of smart file descriptors from the parcel. 369 status_t readUniqueFileDescriptorVector( 370 std::unique_ptr<std::vector<base::unique_fd>>* val) const; 371 status_t readUniqueFileDescriptorVector( 372 std::vector<base::unique_fd>* val) const; 373 374 // Reads a blob from the parcel. 375 // The caller should call release() on the blob after reading its contents. 376 status_t readBlob(size_t len, ReadableBlob* outBlob) const; 377 378 const flat_binder_object* readObject(bool nullMetaData) const; 379 380 // Explicitly close all file descriptors in the parcel. 381 void closeFileDescriptors(); 382 383 // Debugging: get metrics on current allocations. 384 static size_t getGlobalAllocSize(); 385 static size_t getGlobalAllocCount(); 386 387 private: 388 typedef void (*release_func)(Parcel* parcel, 389 const uint8_t* data, size_t dataSize, 390 const binder_size_t* objects, size_t objectsSize, 391 void* cookie); 392 393 uintptr_t ipcData() const; 394 size_t ipcDataSize() const; 395 uintptr_t ipcObjects() const; 396 size_t ipcObjectsCount() const; 397 void ipcSetDataReference(const uint8_t* data, size_t dataSize, 398 const binder_size_t* objects, size_t objectsCount, 399 release_func relFunc, void* relCookie); 400 401 public: 402 void print(TextOutput& to, uint32_t flags = 0) const; 403 404 private: 405 Parcel(const Parcel& o); 406 Parcel& operator=(const Parcel& o); 407 408 status_t finishWrite(size_t len); 409 void releaseObjects(); 410 void acquireObjects(); 411 status_t growData(size_t len); 412 status_t restartWrite(size_t desired); 413 status_t continueWrite(size_t desired); 414 status_t writePointer(uintptr_t val); 415 status_t readPointer(uintptr_t *pArg) const; 416 uintptr_t readPointer() const; 417 void freeDataNoInit(); 418 void initState(); 419 void scanForFds() const; 420 status_t validateReadData(size_t len) const; 421 422 template<class T> 423 status_t readAligned(T *pArg) const; 424 425 template<class T> T readAligned() const; 426 427 template<class T> 428 status_t writeAligned(T val); 429 430 status_t writeRawNullableParcelable(const Parcelable* 431 parcelable); 432 433 template<typename T, typename U> 434 status_t unsafeReadTypedVector(std::vector<T>* val, 435 status_t(Parcel::*read_func)(U*) const) const; 436 template<typename T> 437 status_t readNullableTypedVector(std::unique_ptr<std::vector<T>>* val, 438 status_t(Parcel::*read_func)(T*) const) const; 439 template<typename T> 440 status_t readTypedVector(std::vector<T>* val, 441 status_t(Parcel::*read_func)(T*) const) const; 442 template<typename T, typename U> 443 status_t unsafeWriteTypedVector(const std::vector<T>& val, 444 status_t(Parcel::*write_func)(U)); 445 template<typename T> 446 status_t writeNullableTypedVector(const std::unique_ptr<std::vector<T>>& val, 447 status_t(Parcel::*write_func)(const T&)); 448 template<typename T> 449 status_t writeNullableTypedVector(const std::unique_ptr<std::vector<T>>& val, 450 status_t(Parcel::*write_func)(T)); 451 template<typename T> 452 status_t writeTypedVector(const std::vector<T>& val, 453 status_t(Parcel::*write_func)(const T&)); 454 template<typename T> 455 status_t writeTypedVector(const std::vector<T>& val, 456 status_t(Parcel::*write_func)(T)); 457 458 status_t mError; 459 uint8_t* mData; 460 size_t mDataSize; 461 size_t mDataCapacity; 462 mutable size_t mDataPos; 463 binder_size_t* mObjects; 464 size_t mObjectsSize; 465 size_t mObjectsCapacity; 466 mutable size_t mNextObjectHint; 467 mutable bool mObjectsSorted; 468 469 mutable bool mFdsKnown; 470 mutable bool mHasFds; 471 bool mAllowFds; 472 473 release_func mOwner; 474 void* mOwnerCookie; 475 476 class Blob { 477 public: 478 Blob(); 479 ~Blob(); 480 481 void clear(); 482 void release(); 483 inline size_t size() const { return mSize; } 484 inline int fd() const { return mFd; } 485 inline bool isMutable() const { return mMutable; } 486 487 protected: 488 void init(int fd, void* data, size_t size, bool isMutable); 489 490 int mFd; // owned by parcel so not closed when released 491 void* mData; 492 size_t mSize; 493 bool mMutable; 494 }; 495 496 #if defined(__clang__) 497 #pragma clang diagnostic push 498 #pragma clang diagnostic ignored "-Wweak-vtables" 499 #endif 500 501 // FlattenableHelperInterface and FlattenableHelper avoid generating a vtable entry in objects 502 // following Flattenable template/protocol. 503 class FlattenableHelperInterface { 504 protected: 505 ~FlattenableHelperInterface() { } 506 public: 507 virtual size_t getFlattenedSize() const = 0; 508 virtual size_t getFdCount() const = 0; 509 virtual status_t flatten(void* buffer, size_t size, int* fds, size_t count) const = 0; 510 virtual status_t unflatten(void const* buffer, size_t size, int const* fds, size_t count) = 0; 511 }; 512 513 #if defined(__clang__) 514 #pragma clang diagnostic pop 515 #endif 516 517 // Concrete implementation of FlattenableHelperInterface that delegates virtual calls to the 518 // specified class T implementing the Flattenable protocol. It "virtualizes" a compile-time 519 // protocol. 520 template<typename T> 521 class FlattenableHelper : public FlattenableHelperInterface { 522 friend class Parcel; 523 const Flattenable<T>& val; 524 explicit FlattenableHelper(const Flattenable<T>& _val) : val(_val) { } 525 526 protected: 527 ~FlattenableHelper() = default; 528 public: 529 virtual size_t getFlattenedSize() const { 530 return val.getFlattenedSize(); 531 } 532 virtual size_t getFdCount() const { 533 return val.getFdCount(); 534 } 535 virtual status_t flatten(void* buffer, size_t size, int* fds, size_t count) const { 536 return val.flatten(buffer, size, fds, count); 537 } 538 virtual status_t unflatten(void const* buffer, size_t size, int const* fds, size_t count) { 539 return const_cast<Flattenable<T>&>(val).unflatten(buffer, size, fds, count); 540 } 541 }; 542 status_t write(const FlattenableHelperInterface& val); 543 status_t read(FlattenableHelperInterface& val) const; 544 545 public: 546 class ReadableBlob : public Blob { 547 friend class Parcel; 548 public: 549 inline const void* data() const { return mData; } 550 inline void* mutableData() { return isMutable() ? mData : NULL; } 551 }; 552 553 class WritableBlob : public Blob { 554 friend class Parcel; 555 public: 556 inline void* data() { return mData; } 557 }; 558 559 private: 560 size_t mOpenAshmemSize; 561 562 public: 563 // TODO: Remove once ABI can be changed. 564 size_t getBlobAshmemSize() const; 565 size_t getOpenAshmemSize() const; 566 }; 567 568 // --------------------------------------------------------------------------- 569 570 template<typename T> 571 status_t Parcel::write(const Flattenable<T>& val) { 572 const FlattenableHelper<T> helper(val); 573 return write(helper); 574 } 575 576 template<typename T> 577 status_t Parcel::write(const LightFlattenable<T>& val) { 578 size_t size(val.getFlattenedSize()); 579 if (!val.isFixedSize()) { 580 if (size > INT32_MAX) { 581 return BAD_VALUE; 582 } 583 status_t err = writeInt32(static_cast<int32_t>(size)); 584 if (err != NO_ERROR) { 585 return err; 586 } 587 } 588 if (size) { 589 void* buffer = writeInplace(size); 590 if (buffer == NULL) 591 return NO_MEMORY; 592 return val.flatten(buffer, size); 593 } 594 return NO_ERROR; 595 } 596 597 template<typename T> 598 status_t Parcel::read(Flattenable<T>& val) const { 599 FlattenableHelper<T> helper(val); 600 return read(helper); 601 } 602 603 template<typename T> 604 status_t Parcel::read(LightFlattenable<T>& val) const { 605 size_t size; 606 if (val.isFixedSize()) { 607 size = val.getFlattenedSize(); 608 } else { 609 int32_t s; 610 status_t err = readInt32(&s); 611 if (err != NO_ERROR) { 612 return err; 613 } 614 size = static_cast<size_t>(s); 615 } 616 if (size) { 617 void const* buffer = readInplace(size); 618 return buffer == NULL ? NO_MEMORY : 619 val.unflatten(buffer, size); 620 } 621 return NO_ERROR; 622 } 623 624 template<typename T> 625 status_t Parcel::writeVectorSize(const std::vector<T>& val) { 626 if (val.size() > INT32_MAX) { 627 return BAD_VALUE; 628 } 629 return writeInt32(static_cast<int32_t>(val.size())); 630 } 631 632 template<typename T> 633 status_t Parcel::writeVectorSize(const std::unique_ptr<std::vector<T>>& val) { 634 if (!val) { 635 return writeInt32(-1); 636 } 637 638 return writeVectorSize(*val); 639 } 640 641 template<typename T> 642 status_t Parcel::resizeOutVector(std::vector<T>* val) const { 643 int32_t size; 644 status_t err = readInt32(&size); 645 if (err != NO_ERROR) { 646 return err; 647 } 648 649 if (size < 0) { 650 return UNEXPECTED_NULL; 651 } 652 val->resize(size_t(size)); 653 return OK; 654 } 655 656 template<typename T> 657 status_t Parcel::resizeOutVector(std::unique_ptr<std::vector<T>>* val) const { 658 int32_t size; 659 status_t err = readInt32(&size); 660 if (err != NO_ERROR) { 661 return err; 662 } 663 664 val->reset(); 665 if (size >= 0) { 666 val->reset(new std::vector<T>(size_t(size))); 667 } 668 669 return OK; 670 } 671 672 template<typename T> 673 status_t Parcel::readStrongBinder(sp<T>* val) const { 674 sp<IBinder> tmp; 675 status_t ret = readStrongBinder(&tmp); 676 677 if (ret == OK) { 678 *val = interface_cast<T>(tmp); 679 680 if (val->get() == nullptr) { 681 return UNKNOWN_ERROR; 682 } 683 } 684 685 return ret; 686 } 687 688 template<typename T> 689 status_t Parcel::readNullableStrongBinder(sp<T>* val) const { 690 sp<IBinder> tmp; 691 status_t ret = readNullableStrongBinder(&tmp); 692 693 if (ret == OK) { 694 *val = interface_cast<T>(tmp); 695 696 if (val->get() == nullptr && tmp.get() != nullptr) { 697 ret = UNKNOWN_ERROR; 698 } 699 } 700 701 return ret; 702 } 703 704 template<typename T, typename U> 705 status_t Parcel::unsafeReadTypedVector( 706 std::vector<T>* val, 707 status_t(Parcel::*read_func)(U*) const) const { 708 int32_t size; 709 status_t status = this->readInt32(&size); 710 711 if (status != OK) { 712 return status; 713 } 714 715 if (size < 0) { 716 return UNEXPECTED_NULL; 717 } 718 719 if (val->max_size() < static_cast<size_t>(size)) { 720 return NO_MEMORY; 721 } 722 723 val->resize(static_cast<size_t>(size)); 724 725 if (val->size() < static_cast<size_t>(size)) { 726 return NO_MEMORY; 727 } 728 729 for (auto& v: *val) { 730 status = (this->*read_func)(&v); 731 732 if (status != OK) { 733 return status; 734 } 735 } 736 737 return OK; 738 } 739 740 template<typename T> 741 status_t Parcel::readTypedVector(std::vector<T>* val, 742 status_t(Parcel::*read_func)(T*) const) const { 743 return unsafeReadTypedVector(val, read_func); 744 } 745 746 template<typename T> 747 status_t Parcel::readNullableTypedVector(std::unique_ptr<std::vector<T>>* val, 748 status_t(Parcel::*read_func)(T*) const) const { 749 const size_t start = dataPosition(); 750 int32_t size; 751 status_t status = readInt32(&size); 752 val->reset(); 753 754 if (status != OK || size < 0) { 755 return status; 756 } 757 758 setDataPosition(start); 759 val->reset(new std::vector<T>()); 760 761 status = unsafeReadTypedVector(val->get(), read_func); 762 763 if (status != OK) { 764 val->reset(); 765 } 766 767 return status; 768 } 769 770 template<typename T, typename U> 771 status_t Parcel::unsafeWriteTypedVector(const std::vector<T>& val, 772 status_t(Parcel::*write_func)(U)) { 773 if (val.size() > std::numeric_limits<int32_t>::max()) { 774 return BAD_VALUE; 775 } 776 777 status_t status = this->writeInt32(static_cast<int32_t>(val.size())); 778 779 if (status != OK) { 780 return status; 781 } 782 783 for (const auto& item : val) { 784 status = (this->*write_func)(item); 785 786 if (status != OK) { 787 return status; 788 } 789 } 790 791 return OK; 792 } 793 794 template<typename T> 795 status_t Parcel::writeTypedVector(const std::vector<T>& val, 796 status_t(Parcel::*write_func)(const T&)) { 797 return unsafeWriteTypedVector(val, write_func); 798 } 799 800 template<typename T> 801 status_t Parcel::writeTypedVector(const std::vector<T>& val, 802 status_t(Parcel::*write_func)(T)) { 803 return unsafeWriteTypedVector(val, write_func); 804 } 805 806 template<typename T> 807 status_t Parcel::writeNullableTypedVector(const std::unique_ptr<std::vector<T>>& val, 808 status_t(Parcel::*write_func)(const T&)) { 809 if (val.get() == nullptr) { 810 return this->writeInt32(-1); 811 } 812 813 return unsafeWriteTypedVector(*val, write_func); 814 } 815 816 template<typename T> 817 status_t Parcel::writeNullableTypedVector(const std::unique_ptr<std::vector<T>>& val, 818 status_t(Parcel::*write_func)(T)) { 819 if (val.get() == nullptr) { 820 return this->writeInt32(-1); 821 } 822 823 return unsafeWriteTypedVector(*val, write_func); 824 } 825 826 template<typename T> 827 status_t Parcel::readParcelableVector(std::vector<T>* val) const { 828 return unsafeReadTypedVector<T, Parcelable>(val, &Parcel::readParcelable); 829 } 830 831 template<typename T> 832 status_t Parcel::readParcelableVector(std::unique_ptr<std::vector<std::unique_ptr<T>>>* val) const { 833 const size_t start = dataPosition(); 834 int32_t size; 835 status_t status = readInt32(&size); 836 val->reset(); 837 838 if (status != OK || size < 0) { 839 return status; 840 } 841 842 setDataPosition(start); 843 val->reset(new std::vector<std::unique_ptr<T>>()); 844 845 status = unsafeReadTypedVector(val->get(), &Parcel::readParcelable<T>); 846 847 if (status != OK) { 848 val->reset(); 849 } 850 851 return status; 852 } 853 854 template<typename T> 855 status_t Parcel::readParcelable(std::unique_ptr<T>* parcelable) const { 856 const size_t start = dataPosition(); 857 int32_t present; 858 status_t status = readInt32(&present); 859 parcelable->reset(); 860 861 if (status != OK || !present) { 862 return status; 863 } 864 865 setDataPosition(start); 866 parcelable->reset(new T()); 867 868 status = readParcelable(parcelable->get()); 869 870 if (status != OK) { 871 parcelable->reset(); 872 } 873 874 return status; 875 } 876 877 template<typename T> 878 status_t Parcel::writeNullableParcelable(const std::unique_ptr<T>& parcelable) { 879 return writeRawNullableParcelable(parcelable.get()); 880 } 881 882 template<typename T> 883 status_t Parcel::writeParcelableVector(const std::vector<T>& val) { 884 return unsafeWriteTypedVector<T,const Parcelable&>(val, &Parcel::writeParcelable); 885 } 886 887 template<typename T> 888 status_t Parcel::writeParcelableVector(const std::unique_ptr<std::vector<std::unique_ptr<T>>>& val) { 889 if (val.get() == nullptr) { 890 return this->writeInt32(-1); 891 } 892 893 return unsafeWriteTypedVector(*val, &Parcel::writeNullableParcelable<T>); 894 } 895 896 template<typename T> 897 status_t Parcel::writeParcelableVector(const std::shared_ptr<std::vector<std::unique_ptr<T>>>& val) { 898 if (val.get() == nullptr) { 899 return this->writeInt32(-1); 900 } 901 902 return unsafeWriteTypedVector(*val, &Parcel::writeNullableParcelable<T>); 903 } 904 905 // --------------------------------------------------------------------------- 906 907 inline TextOutput& operator<<(TextOutput& to, const Parcel& parcel) 908 { 909 parcel.print(to); 910 return to; 911 } 912 913 // --------------------------------------------------------------------------- 914 915 // Generic acquire and release of objects. 916 void acquire_object(const sp<ProcessState>& proc, 917 const flat_binder_object& obj, const void* who); 918 void release_object(const sp<ProcessState>& proc, 919 const flat_binder_object& obj, const void* who); 920 921 void flatten_binder(const sp<ProcessState>& proc, 922 const sp<IBinder>& binder, flat_binder_object* out); 923 void flatten_binder(const sp<ProcessState>& proc, 924 const wp<IBinder>& binder, flat_binder_object* out); 925 status_t unflatten_binder(const sp<ProcessState>& proc, 926 const flat_binder_object& flat, sp<IBinder>* out); 927 status_t unflatten_binder(const sp<ProcessState>& proc, 928 const flat_binder_object& flat, wp<IBinder>* out); 929 930 }; // namespace android 931 932 // --------------------------------------------------------------------------- 933 934 #endif // ANDROID_PARCEL_H 935
