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 <linux/android/binder.h> 24 25 #include <android-base/unique_fd.h> 26 #include <cutils/native_handle.h> 27 #include <utils/Errors.h> 28 #include <utils/RefBase.h> 29 #include <utils/String16.h> 30 #include <utils/Vector.h> 31 #include <utils/Flattenable.h> 32 33 #include <binder/IInterface.h> 34 #include <binder/Parcelable.h> 35 #include <binder/Map.h> 36 37 // --------------------------------------------------------------------------- 38 namespace android { 39 40 template <typename T> class Flattenable; 41 template <typename T> class LightFlattenable; 42 class IBinder; 43 class IPCThreadState; 44 class ProcessState; 45 class String8; 46 class TextOutput; 47 48 namespace binder { 49 class Value; 50 }; 51 52 class Parcel { 53 friend class IPCThreadState; 54 public: 55 class ReadableBlob; 56 class WritableBlob; 57 58 Parcel(); 59 ~Parcel(); 60 61 const uint8_t* data() const; 62 size_t dataSize() const; 63 size_t dataAvail() const; 64 size_t dataPosition() const; 65 size_t dataCapacity() const; 66 67 status_t setDataSize(size_t size); 68 void setDataPosition(size_t pos) const; 69 status_t setDataCapacity(size_t size); 70 71 status_t setData(const uint8_t* buffer, size_t len); 72 73 status_t appendFrom(const Parcel *parcel, 74 size_t start, size_t len); 75 76 int compareData(const Parcel& other); 77 78 bool allowFds() const; 79 bool pushAllowFds(bool allowFds); 80 void restoreAllowFds(bool lastValue); 81 82 bool hasFileDescriptors() const; 83 84 // Writes the RPC header. 85 status_t writeInterfaceToken(const String16& interface); 86 87 // Parses the RPC header, returning true if the interface name 88 // in the header matches the expected interface from the caller. 89 // 90 // Additionally, enforceInterface does part of the work of 91 // propagating the StrictMode policy mask, populating the current 92 // IPCThreadState, which as an optimization may optionally be 93 // passed in. 94 bool enforceInterface(const String16& interface, 95 IPCThreadState* threadState = nullptr) const; 96 bool checkInterface(IBinder*) const; 97 98 void freeData(); 99 100 private: 101 const binder_size_t* objects() const; 102 103 public: 104 size_t objectsCount() const; 105 106 status_t errorCheck() const; 107 void setError(status_t err); 108 109 status_t write(const void* data, size_t len); 110 void* writeInplace(size_t len); 111 status_t writeUnpadded(const void* data, size_t len); 112 status_t writeInt32(int32_t val); 113 status_t writeUint32(uint32_t val); 114 status_t writeInt64(int64_t val); 115 status_t writeUint64(uint64_t val); 116 status_t writeFloat(float val); 117 status_t writeDouble(double val); 118 status_t writeCString(const char* str); 119 status_t writeString8(const String8& str); 120 status_t writeString16(const String16& str); 121 status_t writeString16(const std::unique_ptr<String16>& str); 122 status_t writeString16(const char16_t* str, size_t len); 123 status_t writeStrongBinder(const sp<IBinder>& val); 124 status_t writeWeakBinder(const wp<IBinder>& val); 125 status_t writeInt32Array(size_t len, const int32_t *val); 126 status_t writeByteArray(size_t len, const uint8_t *val); 127 status_t writeBool(bool val); 128 status_t writeChar(char16_t val); 129 status_t writeByte(int8_t val); 130 131 // Take a UTF8 encoded string, convert to UTF16, write it to the parcel. 132 status_t writeUtf8AsUtf16(const std::string& str); 133 status_t writeUtf8AsUtf16(const std::unique_ptr<std::string>& str); 134 135 status_t writeByteVector(const std::unique_ptr<std::vector<int8_t>>& val); 136 status_t writeByteVector(const std::vector<int8_t>& val); 137 status_t writeByteVector(const std::unique_ptr<std::vector<uint8_t>>& val); 138 status_t writeByteVector(const std::vector<uint8_t>& val); 139 status_t writeInt32Vector(const std::unique_ptr<std::vector<int32_t>>& val); 140 status_t writeInt32Vector(const std::vector<int32_t>& val); 141 status_t writeInt64Vector(const std::unique_ptr<std::vector<int64_t>>& val); 142 status_t writeInt64Vector(const std::vector<int64_t>& val); 143 status_t writeUint64Vector(const std::unique_ptr<std::vector<uint64_t>>& val); 144 status_t writeUint64Vector(const std::vector<uint64_t>& val); 145 status_t writeFloatVector(const std::unique_ptr<std::vector<float>>& val); 146 status_t writeFloatVector(const std::vector<float>& val); 147 status_t writeDoubleVector(const std::unique_ptr<std::vector<double>>& val); 148 status_t writeDoubleVector(const std::vector<double>& val); 149 status_t writeBoolVector(const std::unique_ptr<std::vector<bool>>& val); 150 status_t writeBoolVector(const std::vector<bool>& val); 151 status_t writeCharVector(const std::unique_ptr<std::vector<char16_t>>& val); 152 status_t writeCharVector(const std::vector<char16_t>& val); 153 status_t writeString16Vector( 154 const std::unique_ptr<std::vector<std::unique_ptr<String16>>>& val); 155 status_t writeString16Vector(const std::vector<String16>& val); 156 status_t writeUtf8VectorAsUtf16Vector( 157 const std::unique_ptr<std::vector<std::unique_ptr<std::string>>>& val); 158 status_t writeUtf8VectorAsUtf16Vector(const std::vector<std::string>& val); 159 160 status_t writeStrongBinderVector(const std::unique_ptr<std::vector<sp<IBinder>>>& val); 161 status_t writeStrongBinderVector(const std::vector<sp<IBinder>>& val); 162 163 template<typename T> 164 status_t writeParcelableVector(const std::unique_ptr<std::vector<std::unique_ptr<T>>>& val); 165 template<typename T> 166 status_t writeParcelableVector(const std::shared_ptr<std::vector<std::unique_ptr<T>>>& val); 167 template<typename T> 168 status_t writeParcelableVector(const std::vector<T>& val); 169 170 template<typename T> 171 status_t writeNullableParcelable(const std::unique_ptr<T>& parcelable); 172 173 status_t writeParcelable(const Parcelable& parcelable); 174 175 status_t writeValue(const binder::Value& value); 176 177 template<typename T> 178 status_t write(const Flattenable<T>& val); 179 180 template<typename T> 181 status_t write(const LightFlattenable<T>& val); 182 183 template<typename T> 184 status_t writeVectorSize(const std::vector<T>& val); 185 template<typename T> 186 status_t writeVectorSize(const std::unique_ptr<std::vector<T>>& val); 187 188 status_t writeMap(const binder::Map& map); 189 status_t writeNullableMap(const std::unique_ptr<binder::Map>& map); 190 191 // Place a native_handle into the parcel (the native_handle's file- 192 // descriptors are dup'ed, so it is safe to delete the native_handle 193 // when this function returns). 194 // Doesn't take ownership of the native_handle. 195 status_t writeNativeHandle(const native_handle* handle); 196 197 // Place a file descriptor into the parcel. The given fd must remain 198 // valid for the lifetime of the parcel. 199 // The Parcel does not take ownership of the given fd unless you ask it to. 200 status_t writeFileDescriptor(int fd, bool takeOwnership = false); 201 202 // Place a file descriptor into the parcel. A dup of the fd is made, which 203 // will be closed once the parcel is destroyed. 204 status_t writeDupFileDescriptor(int fd); 205 206 // Place a Java "parcel file descriptor" into the parcel. The given fd must remain 207 // valid for the lifetime of the parcel. 208 // The Parcel does not take ownership of the given fd unless you ask it to. 209 status_t writeParcelFileDescriptor(int fd, bool takeOwnership = false); 210 211 // Place a Java "parcel file descriptor" into the parcel. A dup of the fd is made, which will 212 // be closed once the parcel is destroyed. 213 status_t writeDupParcelFileDescriptor(int fd); 214 215 // Place a file descriptor into the parcel. This will not affect the 216 // semantics of the smart file descriptor. A new descriptor will be 217 // created, and will be closed when the parcel is destroyed. 218 status_t writeUniqueFileDescriptor( 219 const base::unique_fd& fd); 220 221 // Place a vector of file desciptors into the parcel. Each descriptor is 222 // dup'd as in writeDupFileDescriptor 223 status_t writeUniqueFileDescriptorVector( 224 const std::unique_ptr<std::vector<base::unique_fd>>& val); 225 status_t writeUniqueFileDescriptorVector( 226 const std::vector<base::unique_fd>& val); 227 228 // Writes a blob to the parcel. 229 // If the blob is small, then it is stored in-place, otherwise it is 230 // transferred by way of an anonymous shared memory region. Prefer sending 231 // immutable blobs if possible since they may be subsequently transferred between 232 // processes without further copying whereas mutable blobs always need to be copied. 233 // The caller should call release() on the blob after writing its contents. 234 status_t writeBlob(size_t len, bool mutableCopy, WritableBlob* outBlob); 235 236 // Write an existing immutable blob file descriptor to the parcel. 237 // This allows the client to send the same blob to multiple processes 238 // as long as it keeps a dup of the blob file descriptor handy for later. 239 status_t writeDupImmutableBlobFileDescriptor(int fd); 240 241 status_t writeObject(const flat_binder_object& val, bool nullMetaData); 242 243 // Like Parcel.java's writeNoException(). Just writes a zero int32. 244 // Currently the native implementation doesn't do any of the StrictMode 245 // stack gathering and serialization that the Java implementation does. 246 status_t writeNoException(); 247 248 void remove(size_t start, size_t amt); 249 250 status_t read(void* outData, size_t len) const; 251 const void* readInplace(size_t len) const; 252 int32_t readInt32() const; 253 status_t readInt32(int32_t *pArg) const; 254 uint32_t readUint32() const; 255 status_t readUint32(uint32_t *pArg) const; 256 int64_t readInt64() const; 257 status_t readInt64(int64_t *pArg) const; 258 uint64_t readUint64() const; 259 status_t readUint64(uint64_t *pArg) const; 260 float readFloat() const; 261 status_t readFloat(float *pArg) const; 262 double readDouble() const; 263 status_t readDouble(double *pArg) const; 264 intptr_t readIntPtr() const; 265 status_t readIntPtr(intptr_t *pArg) const; 266 bool readBool() const; 267 status_t readBool(bool *pArg) const; 268 char16_t readChar() const; 269 status_t readChar(char16_t *pArg) const; 270 int8_t readByte() const; 271 status_t readByte(int8_t *pArg) const; 272 273 // Read a UTF16 encoded string, convert to UTF8 274 status_t readUtf8FromUtf16(std::string* str) const; 275 status_t readUtf8FromUtf16(std::unique_ptr<std::string>* str) const; 276 277 const char* readCString() const; 278 String8 readString8() const; 279 status_t readString8(String8* pArg) const; 280 String16 readString16() const; 281 status_t readString16(String16* pArg) const; 282 status_t readString16(std::unique_ptr<String16>* pArg) const; 283 const char16_t* readString16Inplace(size_t* outLen) const; 284 sp<IBinder> readStrongBinder() const; 285 status_t readStrongBinder(sp<IBinder>* val) const; 286 status_t readNullableStrongBinder(sp<IBinder>* val) const; 287 wp<IBinder> readWeakBinder() const; 288 289 template<typename T> 290 status_t readParcelableVector( 291 std::unique_ptr<std::vector<std::unique_ptr<T>>>* val) const; 292 template<typename T> 293 status_t readParcelableVector(std::vector<T>* val) const; 294 295 status_t readParcelable(Parcelable* parcelable) const; 296 297 template<typename T> 298 status_t readParcelable(std::unique_ptr<T>* parcelable) const; 299 300 status_t readValue(binder::Value* value) const; 301 302 template<typename T> 303 status_t readStrongBinder(sp<T>* val) const; 304 305 template<typename T> 306 status_t readNullableStrongBinder(sp<T>* val) const; 307 308 status_t readStrongBinderVector(std::unique_ptr<std::vector<sp<IBinder>>>* val) const; 309 status_t readStrongBinderVector(std::vector<sp<IBinder>>* val) const; 310 311 status_t readByteVector(std::unique_ptr<std::vector<int8_t>>* val) const; 312 status_t readByteVector(std::vector<int8_t>* val) const; 313 status_t readByteVector(std::unique_ptr<std::vector<uint8_t>>* val) const; 314 status_t readByteVector(std::vector<uint8_t>* val) const; 315 status_t readInt32Vector(std::unique_ptr<std::vector<int32_t>>* val) const; 316 status_t readInt32Vector(std::vector<int32_t>* val) const; 317 status_t readInt64Vector(std::unique_ptr<std::vector<int64_t>>* val) const; 318 status_t readInt64Vector(std::vector<int64_t>* val) const; 319 status_t readUint64Vector(std::unique_ptr<std::vector<uint64_t>>* val) const; 320 status_t readUint64Vector(std::vector<uint64_t>* val) const; 321 status_t readFloatVector(std::unique_ptr<std::vector<float>>* val) const; 322 status_t readFloatVector(std::vector<float>* val) const; 323 status_t readDoubleVector(std::unique_ptr<std::vector<double>>* val) const; 324 status_t readDoubleVector(std::vector<double>* val) const; 325 status_t readBoolVector(std::unique_ptr<std::vector<bool>>* val) const; 326 status_t readBoolVector(std::vector<bool>* val) const; 327 status_t readCharVector(std::unique_ptr<std::vector<char16_t>>* val) const; 328 status_t readCharVector(std::vector<char16_t>* val) const; 329 status_t readString16Vector( 330 std::unique_ptr<std::vector<std::unique_ptr<String16>>>* val) const; 331 status_t readString16Vector(std::vector<String16>* val) const; 332 status_t readUtf8VectorFromUtf16Vector( 333 std::unique_ptr<std::vector<std::unique_ptr<std::string>>>* val) const; 334 status_t readUtf8VectorFromUtf16Vector(std::vector<std::string>* val) const; 335 336 template<typename T> 337 status_t read(Flattenable<T>& val) const; 338 339 template<typename T> 340 status_t read(LightFlattenable<T>& val) const; 341 342 template<typename T> 343 status_t resizeOutVector(std::vector<T>* val) const; 344 template<typename T> 345 status_t resizeOutVector(std::unique_ptr<std::vector<T>>* val) const; 346 347 status_t readMap(binder::Map* map)const; 348 status_t readNullableMap(std::unique_ptr<binder::Map>* map) const; 349 350 // Like Parcel.java's readExceptionCode(). Reads the first int32 351 // off of a Parcel's header, returning 0 or the negative error 352 // code on exceptions, but also deals with skipping over rich 353 // response headers. Callers should use this to read & parse the 354 // response headers rather than doing it by hand. 355 int32_t readExceptionCode() const; 356 357 // Retrieve native_handle from the parcel. This returns a copy of the 358 // parcel's native_handle (the caller takes ownership). The caller 359 // must free the native_handle with native_handle_close() and 360 // native_handle_delete(). 361 native_handle* readNativeHandle() const; 362 363 364 // Retrieve a file descriptor from the parcel. This returns the raw fd 365 // in the parcel, which you do not own -- use dup() to get your own copy. 366 int readFileDescriptor() const; 367 368 // Retrieve a Java "parcel file descriptor" from the parcel. This returns the raw fd 369 // in the parcel, which you do not own -- use dup() to get your own copy. 370 int readParcelFileDescriptor() const; 371 372 // Retrieve a smart file descriptor from the parcel. 373 status_t readUniqueFileDescriptor( 374 base::unique_fd* val) const; 375 376 // Retrieve a Java "parcel file descriptor" from the parcel. 377 status_t readUniqueParcelFileDescriptor(base::unique_fd* val) const; 378 379 380 // Retrieve a vector of smart file descriptors from the parcel. 381 status_t readUniqueFileDescriptorVector( 382 std::unique_ptr<std::vector<base::unique_fd>>* val) const; 383 status_t readUniqueFileDescriptorVector( 384 std::vector<base::unique_fd>* val) const; 385 386 // Reads a blob from the parcel. 387 // The caller should call release() on the blob after reading its contents. 388 status_t readBlob(size_t len, ReadableBlob* outBlob) const; 389 390 const flat_binder_object* readObject(bool nullMetaData) const; 391 392 // Explicitly close all file descriptors in the parcel. 393 void closeFileDescriptors(); 394 395 // Debugging: get metrics on current allocations. 396 static size_t getGlobalAllocSize(); 397 static size_t getGlobalAllocCount(); 398 399 bool replaceCallingWorkSourceUid(uid_t uid); 400 // Returns the work source provided by the caller. This can only be trusted for trusted calling 401 // uid. 402 uid_t readCallingWorkSourceUid(); 403 void readRequestHeaders() const; 404 405 private: 406 typedef void (*release_func)(Parcel* parcel, 407 const uint8_t* data, size_t dataSize, 408 const binder_size_t* objects, size_t objectsSize, 409 void* cookie); 410 411 uintptr_t ipcData() const; 412 size_t ipcDataSize() const; 413 uintptr_t ipcObjects() const; 414 size_t ipcObjectsCount() const; 415 void ipcSetDataReference(const uint8_t* data, size_t dataSize, 416 const binder_size_t* objects, size_t objectsCount, 417 release_func relFunc, void* relCookie); 418 419 public: 420 void print(TextOutput& to, uint32_t flags = 0) const; 421 422 private: 423 Parcel(const Parcel& o); 424 Parcel& operator=(const Parcel& o); 425 426 status_t finishWrite(size_t len); 427 void releaseObjects(); 428 void acquireObjects(); 429 status_t growData(size_t len); 430 status_t restartWrite(size_t desired); 431 status_t continueWrite(size_t desired); 432 status_t writePointer(uintptr_t val); 433 status_t readPointer(uintptr_t *pArg) const; 434 uintptr_t readPointer() const; 435 void freeDataNoInit(); 436 void initState(); 437 void scanForFds() const; 438 status_t validateReadData(size_t len) const; 439 void updateWorkSourceRequestHeaderPosition() const; 440 441 template<class T> 442 status_t readAligned(T *pArg) const; 443 444 template<class T> T readAligned() const; 445 446 template<class T> 447 status_t writeAligned(T val); 448 449 status_t writeRawNullableParcelable(const Parcelable* 450 parcelable); 451 452 template<typename T, typename U> 453 status_t unsafeReadTypedVector(std::vector<T>* val, 454 status_t(Parcel::*read_func)(U*) const) const; 455 template<typename T> 456 status_t readNullableTypedVector(std::unique_ptr<std::vector<T>>* val, 457 status_t(Parcel::*read_func)(T*) const) const; 458 template<typename T> 459 status_t readTypedVector(std::vector<T>* val, 460 status_t(Parcel::*read_func)(T*) const) const; 461 template<typename T, typename U> 462 status_t unsafeWriteTypedVector(const std::vector<T>& val, 463 status_t(Parcel::*write_func)(U)); 464 template<typename T> 465 status_t writeNullableTypedVector(const std::unique_ptr<std::vector<T>>& val, 466 status_t(Parcel::*write_func)(const T&)); 467 template<typename T> 468 status_t writeNullableTypedVector(const std::unique_ptr<std::vector<T>>& val, 469 status_t(Parcel::*write_func)(T)); 470 template<typename T> 471 status_t writeTypedVector(const std::vector<T>& val, 472 status_t(Parcel::*write_func)(const T&)); 473 template<typename T> 474 status_t writeTypedVector(const std::vector<T>& val, 475 status_t(Parcel::*write_func)(T)); 476 477 status_t mError; 478 uint8_t* mData; 479 size_t mDataSize; 480 size_t mDataCapacity; 481 mutable size_t mDataPos; 482 binder_size_t* mObjects; 483 size_t mObjectsSize; 484 size_t mObjectsCapacity; 485 mutable size_t mNextObjectHint; 486 mutable bool mObjectsSorted; 487 488 mutable bool mRequestHeaderPresent; 489 mutable size_t mWorkSourceRequestHeaderPosition; 490 491 mutable bool mFdsKnown; 492 mutable bool mHasFds; 493 bool mAllowFds; 494 495 release_func mOwner; 496 void* mOwnerCookie; 497 498 class Blob { 499 public: 500 Blob(); 501 ~Blob(); 502 503 void clear(); 504 void release(); 505 inline size_t size() const { return mSize; } 506 inline int fd() const { return mFd; } 507 inline bool isMutable() const { return mMutable; } 508 509 protected: 510 void init(int fd, void* data, size_t size, bool isMutable); 511 512 int mFd; // owned by parcel so not closed when released 513 void* mData; 514 size_t mSize; 515 bool mMutable; 516 }; 517 518 #if defined(__clang__) 519 #pragma clang diagnostic push 520 #pragma clang diagnostic ignored "-Wweak-vtables" 521 #endif 522 523 // FlattenableHelperInterface and FlattenableHelper avoid generating a vtable entry in objects 524 // following Flattenable template/protocol. 525 class FlattenableHelperInterface { 526 protected: 527 ~FlattenableHelperInterface() { } 528 public: 529 virtual size_t getFlattenedSize() const = 0; 530 virtual size_t getFdCount() const = 0; 531 virtual status_t flatten(void* buffer, size_t size, int* fds, size_t count) const = 0; 532 virtual status_t unflatten(void const* buffer, size_t size, int const* fds, size_t count) = 0; 533 }; 534 535 #if defined(__clang__) 536 #pragma clang diagnostic pop 537 #endif 538 539 // Concrete implementation of FlattenableHelperInterface that delegates virtual calls to the 540 // specified class T implementing the Flattenable protocol. It "virtualizes" a compile-time 541 // protocol. 542 template<typename T> 543 class FlattenableHelper : public FlattenableHelperInterface { 544 friend class Parcel; 545 const Flattenable<T>& val; 546 explicit FlattenableHelper(const Flattenable<T>& _val) : val(_val) { } 547 548 protected: 549 ~FlattenableHelper() = default; 550 public: 551 virtual size_t getFlattenedSize() const { 552 return val.getFlattenedSize(); 553 } 554 virtual size_t getFdCount() const { 555 return val.getFdCount(); 556 } 557 virtual status_t flatten(void* buffer, size_t size, int* fds, size_t count) const { 558 return val.flatten(buffer, size, fds, count); 559 } 560 virtual status_t unflatten(void const* buffer, size_t size, int const* fds, size_t count) { 561 return const_cast<Flattenable<T>&>(val).unflatten(buffer, size, fds, count); 562 } 563 }; 564 status_t write(const FlattenableHelperInterface& val); 565 status_t read(FlattenableHelperInterface& val) const; 566 567 public: 568 class ReadableBlob : public Blob { 569 friend class Parcel; 570 public: 571 inline const void* data() const { return mData; } 572 inline void* mutableData() { return isMutable() ? mData : nullptr; } 573 }; 574 575 class WritableBlob : public Blob { 576 friend class Parcel; 577 public: 578 inline void* data() { return mData; } 579 }; 580 581 private: 582 size_t mOpenAshmemSize; 583 584 public: 585 // TODO: Remove once ABI can be changed. 586 size_t getBlobAshmemSize() const; 587 size_t getOpenAshmemSize() const; 588 }; 589 590 // --------------------------------------------------------------------------- 591 592 template<typename T> 593 status_t Parcel::write(const Flattenable<T>& val) { 594 const FlattenableHelper<T> helper(val); 595 return write(helper); 596 } 597 598 template<typename T> 599 status_t Parcel::write(const LightFlattenable<T>& val) { 600 size_t size(val.getFlattenedSize()); 601 if (!val.isFixedSize()) { 602 if (size > INT32_MAX) { 603 return BAD_VALUE; 604 } 605 status_t err = writeInt32(static_cast<int32_t>(size)); 606 if (err != NO_ERROR) { 607 return err; 608 } 609 } 610 if (size) { 611 void* buffer = writeInplace(size); 612 if (buffer == nullptr) 613 return NO_MEMORY; 614 return val.flatten(buffer, size); 615 } 616 return NO_ERROR; 617 } 618 619 template<typename T> 620 status_t Parcel::read(Flattenable<T>& val) const { 621 FlattenableHelper<T> helper(val); 622 return read(helper); 623 } 624 625 template<typename T> 626 status_t Parcel::read(LightFlattenable<T>& val) const { 627 size_t size; 628 if (val.isFixedSize()) { 629 size = val.getFlattenedSize(); 630 } else { 631 int32_t s; 632 status_t err = readInt32(&s); 633 if (err != NO_ERROR) { 634 return err; 635 } 636 size = static_cast<size_t>(s); 637 } 638 if (size) { 639 void const* buffer = readInplace(size); 640 return buffer == nullptr ? NO_MEMORY : 641 val.unflatten(buffer, size); 642 } 643 return NO_ERROR; 644 } 645 646 template<typename T> 647 status_t Parcel::writeVectorSize(const std::vector<T>& val) { 648 if (val.size() > INT32_MAX) { 649 return BAD_VALUE; 650 } 651 return writeInt32(static_cast<int32_t>(val.size())); 652 } 653 654 template<typename T> 655 status_t Parcel::writeVectorSize(const std::unique_ptr<std::vector<T>>& val) { 656 if (!val) { 657 return writeInt32(-1); 658 } 659 660 return writeVectorSize(*val); 661 } 662 663 template<typename T> 664 status_t Parcel::resizeOutVector(std::vector<T>* val) const { 665 int32_t size; 666 status_t err = readInt32(&size); 667 if (err != NO_ERROR) { 668 return err; 669 } 670 671 if (size < 0) { 672 return UNEXPECTED_NULL; 673 } 674 val->resize(size_t(size)); 675 return OK; 676 } 677 678 template<typename T> 679 status_t Parcel::resizeOutVector(std::unique_ptr<std::vector<T>>* val) const { 680 int32_t size; 681 status_t err = readInt32(&size); 682 if (err != NO_ERROR) { 683 return err; 684 } 685 686 val->reset(); 687 if (size >= 0) { 688 val->reset(new std::vector<T>(size_t(size))); 689 } 690 691 return OK; 692 } 693 694 template<typename T> 695 status_t Parcel::readStrongBinder(sp<T>* val) const { 696 sp<IBinder> tmp; 697 status_t ret = readStrongBinder(&tmp); 698 699 if (ret == OK) { 700 *val = interface_cast<T>(tmp); 701 702 if (val->get() == nullptr) { 703 return UNKNOWN_ERROR; 704 } 705 } 706 707 return ret; 708 } 709 710 template<typename T> 711 status_t Parcel::readNullableStrongBinder(sp<T>* val) const { 712 sp<IBinder> tmp; 713 status_t ret = readNullableStrongBinder(&tmp); 714 715 if (ret == OK) { 716 *val = interface_cast<T>(tmp); 717 718 if (val->get() == nullptr && tmp.get() != nullptr) { 719 ret = UNKNOWN_ERROR; 720 } 721 } 722 723 return ret; 724 } 725 726 template<typename T, typename U> 727 status_t Parcel::unsafeReadTypedVector( 728 std::vector<T>* val, 729 status_t(Parcel::*read_func)(U*) const) const { 730 int32_t size; 731 status_t status = this->readInt32(&size); 732 733 if (status != OK) { 734 return status; 735 } 736 737 if (size < 0) { 738 return UNEXPECTED_NULL; 739 } 740 741 if (val->max_size() < static_cast<size_t>(size)) { 742 return NO_MEMORY; 743 } 744 745 val->resize(static_cast<size_t>(size)); 746 747 if (val->size() < static_cast<size_t>(size)) { 748 return NO_MEMORY; 749 } 750 751 for (auto& v: *val) { 752 status = (this->*read_func)(&v); 753 754 if (status != OK) { 755 return status; 756 } 757 } 758 759 return OK; 760 } 761 762 template<typename T> 763 status_t Parcel::readTypedVector(std::vector<T>* val, 764 status_t(Parcel::*read_func)(T*) const) const { 765 return unsafeReadTypedVector(val, read_func); 766 } 767 768 template<typename T> 769 status_t Parcel::readNullableTypedVector(std::unique_ptr<std::vector<T>>* val, 770 status_t(Parcel::*read_func)(T*) const) const { 771 const size_t start = dataPosition(); 772 int32_t size; 773 status_t status = readInt32(&size); 774 val->reset(); 775 776 if (status != OK || size < 0) { 777 return status; 778 } 779 780 setDataPosition(start); 781 val->reset(new std::vector<T>()); 782 783 status = unsafeReadTypedVector(val->get(), read_func); 784 785 if (status != OK) { 786 val->reset(); 787 } 788 789 return status; 790 } 791 792 template<typename T, typename U> 793 status_t Parcel::unsafeWriteTypedVector(const std::vector<T>& val, 794 status_t(Parcel::*write_func)(U)) { 795 if (val.size() > std::numeric_limits<int32_t>::max()) { 796 return BAD_VALUE; 797 } 798 799 status_t status = this->writeInt32(static_cast<int32_t>(val.size())); 800 801 if (status != OK) { 802 return status; 803 } 804 805 for (const auto& item : val) { 806 status = (this->*write_func)(item); 807 808 if (status != OK) { 809 return status; 810 } 811 } 812 813 return OK; 814 } 815 816 template<typename T> 817 status_t Parcel::writeTypedVector(const std::vector<T>& val, 818 status_t(Parcel::*write_func)(const T&)) { 819 return unsafeWriteTypedVector(val, write_func); 820 } 821 822 template<typename T> 823 status_t Parcel::writeTypedVector(const std::vector<T>& val, 824 status_t(Parcel::*write_func)(T)) { 825 return unsafeWriteTypedVector(val, write_func); 826 } 827 828 template<typename T> 829 status_t Parcel::writeNullableTypedVector(const std::unique_ptr<std::vector<T>>& val, 830 status_t(Parcel::*write_func)(const T&)) { 831 if (val.get() == nullptr) { 832 return this->writeInt32(-1); 833 } 834 835 return unsafeWriteTypedVector(*val, write_func); 836 } 837 838 template<typename T> 839 status_t Parcel::writeNullableTypedVector(const std::unique_ptr<std::vector<T>>& val, 840 status_t(Parcel::*write_func)(T)) { 841 if (val.get() == nullptr) { 842 return this->writeInt32(-1); 843 } 844 845 return unsafeWriteTypedVector(*val, write_func); 846 } 847 848 template<typename T> 849 status_t Parcel::readParcelableVector(std::vector<T>* val) const { 850 return unsafeReadTypedVector<T, Parcelable>(val, &Parcel::readParcelable); 851 } 852 853 template<typename T> 854 status_t Parcel::readParcelableVector(std::unique_ptr<std::vector<std::unique_ptr<T>>>* val) const { 855 const size_t start = dataPosition(); 856 int32_t size; 857 status_t status = readInt32(&size); 858 val->reset(); 859 860 if (status != OK || size < 0) { 861 return status; 862 } 863 864 setDataPosition(start); 865 val->reset(new std::vector<std::unique_ptr<T>>()); 866 867 status = unsafeReadTypedVector(val->get(), &Parcel::readParcelable<T>); 868 869 if (status != OK) { 870 val->reset(); 871 } 872 873 return status; 874 } 875 876 template<typename T> 877 status_t Parcel::readParcelable(std::unique_ptr<T>* parcelable) const { 878 const size_t start = dataPosition(); 879 int32_t present; 880 status_t status = readInt32(&present); 881 parcelable->reset(); 882 883 if (status != OK || !present) { 884 return status; 885 } 886 887 setDataPosition(start); 888 parcelable->reset(new T()); 889 890 status = readParcelable(parcelable->get()); 891 892 if (status != OK) { 893 parcelable->reset(); 894 } 895 896 return status; 897 } 898 899 template<typename T> 900 status_t Parcel::writeNullableParcelable(const std::unique_ptr<T>& parcelable) { 901 return writeRawNullableParcelable(parcelable.get()); 902 } 903 904 template<typename T> 905 status_t Parcel::writeParcelableVector(const std::vector<T>& val) { 906 return unsafeWriteTypedVector<T,const Parcelable&>(val, &Parcel::writeParcelable); 907 } 908 909 template<typename T> 910 status_t Parcel::writeParcelableVector(const std::unique_ptr<std::vector<std::unique_ptr<T>>>& val) { 911 if (val.get() == nullptr) { 912 return this->writeInt32(-1); 913 } 914 915 return unsafeWriteTypedVector(*val, &Parcel::writeNullableParcelable<T>); 916 } 917 918 template<typename T> 919 status_t Parcel::writeParcelableVector(const std::shared_ptr<std::vector<std::unique_ptr<T>>>& val) { 920 if (val.get() == nullptr) { 921 return this->writeInt32(-1); 922 } 923 924 return unsafeWriteTypedVector(*val, &Parcel::writeNullableParcelable<T>); 925 } 926 927 // --------------------------------------------------------------------------- 928 929 inline TextOutput& operator<<(TextOutput& to, const Parcel& parcel) 930 { 931 parcel.print(to); 932 return to; 933 } 934 935 // --------------------------------------------------------------------------- 936 937 // Generic acquire and release of objects. 938 void acquire_object(const sp<ProcessState>& proc, 939 const flat_binder_object& obj, const void* who); 940 void release_object(const sp<ProcessState>& proc, 941 const flat_binder_object& obj, const void* who); 942 943 void flatten_binder(const sp<ProcessState>& proc, 944 const sp<IBinder>& binder, flat_binder_object* out); 945 void flatten_binder(const sp<ProcessState>& proc, 946 const wp<IBinder>& binder, flat_binder_object* out); 947 status_t unflatten_binder(const sp<ProcessState>& proc, 948 const flat_binder_object& flat, sp<IBinder>* out); 949 status_t unflatten_binder(const sp<ProcessState>& proc, 950 const flat_binder_object& flat, wp<IBinder>* out); 951 952 }; // namespace android 953 954 // --------------------------------------------------------------------------- 955 956 #endif // ANDROID_PARCEL_H 957
