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; 420 421 template<class T> 422 status_t readAligned(T *pArg) const; 423 424 template<class T> T readAligned() const; 425 426 template<class T> 427 status_t writeAligned(T val); 428 429 status_t writeRawNullableParcelable(const Parcelable* 430 parcelable); 431 432 template<typename T, typename U> 433 status_t unsafeReadTypedVector(std::vector<T>* val, 434 status_t(Parcel::*read_func)(U*) const) const; 435 template<typename T> 436 status_t readNullableTypedVector(std::unique_ptr<std::vector<T>>* val, 437 status_t(Parcel::*read_func)(T*) const) const; 438 template<typename T> 439 status_t readTypedVector(std::vector<T>* val, 440 status_t(Parcel::*read_func)(T*) const) const; 441 template<typename T, typename U> 442 status_t unsafeWriteTypedVector(const std::vector<T>& val, 443 status_t(Parcel::*write_func)(U)); 444 template<typename T> 445 status_t writeNullableTypedVector(const std::unique_ptr<std::vector<T>>& val, 446 status_t(Parcel::*write_func)(const T&)); 447 template<typename T> 448 status_t writeNullableTypedVector(const std::unique_ptr<std::vector<T>>& val, 449 status_t(Parcel::*write_func)(T)); 450 template<typename T> 451 status_t writeTypedVector(const std::vector<T>& val, 452 status_t(Parcel::*write_func)(const T&)); 453 template<typename T> 454 status_t writeTypedVector(const std::vector<T>& val, 455 status_t(Parcel::*write_func)(T)); 456 457 status_t mError; 458 uint8_t* mData; 459 size_t mDataSize; 460 size_t mDataCapacity; 461 mutable size_t mDataPos; 462 binder_size_t* mObjects; 463 size_t mObjectsSize; 464 size_t mObjectsCapacity; 465 mutable size_t mNextObjectHint; 466 467 mutable bool mFdsKnown; 468 mutable bool mHasFds; 469 bool mAllowFds; 470 471 release_func mOwner; 472 void* mOwnerCookie; 473 474 class Blob { 475 public: 476 Blob(); 477 ~Blob(); 478 479 void clear(); 480 void release(); 481 inline size_t size() const { return mSize; } 482 inline int fd() const { return mFd; } 483 inline bool isMutable() const { return mMutable; } 484 485 protected: 486 void init(int fd, void* data, size_t size, bool isMutable); 487 488 int mFd; // owned by parcel so not closed when released 489 void* mData; 490 size_t mSize; 491 bool mMutable; 492 }; 493 494 #if defined(__clang__) 495 #pragma clang diagnostic push 496 #pragma clang diagnostic ignored "-Wweak-vtables" 497 #endif 498 499 // FlattenableHelperInterface and FlattenableHelper avoid generating a vtable entry in objects 500 // following Flattenable template/protocol. 501 class FlattenableHelperInterface { 502 protected: 503 ~FlattenableHelperInterface() { } 504 public: 505 virtual size_t getFlattenedSize() const = 0; 506 virtual size_t getFdCount() const = 0; 507 virtual status_t flatten(void* buffer, size_t size, int* fds, size_t count) const = 0; 508 virtual status_t unflatten(void const* buffer, size_t size, int const* fds, size_t count) = 0; 509 }; 510 511 #if defined(__clang__) 512 #pragma clang diagnostic pop 513 #endif 514 515 // Concrete implementation of FlattenableHelperInterface that delegates virtual calls to the 516 // specified class T implementing the Flattenable protocol. It "virtualizes" a compile-time 517 // protocol. 518 template<typename T> 519 class FlattenableHelper : public FlattenableHelperInterface { 520 friend class Parcel; 521 const Flattenable<T>& val; 522 explicit FlattenableHelper(const Flattenable<T>& _val) : val(_val) { } 523 524 protected: 525 ~FlattenableHelper() = default; 526 public: 527 virtual size_t getFlattenedSize() const { 528 return val.getFlattenedSize(); 529 } 530 virtual size_t getFdCount() const { 531 return val.getFdCount(); 532 } 533 virtual status_t flatten(void* buffer, size_t size, int* fds, size_t count) const { 534 return val.flatten(buffer, size, fds, count); 535 } 536 virtual status_t unflatten(void const* buffer, size_t size, int const* fds, size_t count) { 537 return const_cast<Flattenable<T>&>(val).unflatten(buffer, size, fds, count); 538 } 539 }; 540 status_t write(const FlattenableHelperInterface& val); 541 status_t read(FlattenableHelperInterface& val) const; 542 543 public: 544 class ReadableBlob : public Blob { 545 friend class Parcel; 546 public: 547 inline const void* data() const { return mData; } 548 inline void* mutableData() { return isMutable() ? mData : NULL; } 549 }; 550 551 class WritableBlob : public Blob { 552 friend class Parcel; 553 public: 554 inline void* data() { return mData; } 555 }; 556 557 private: 558 size_t mOpenAshmemSize; 559 560 public: 561 // TODO: Remove once ABI can be changed. 562 size_t getBlobAshmemSize() const; 563 size_t getOpenAshmemSize() const; 564 }; 565 566 // --------------------------------------------------------------------------- 567 568 template<typename T> 569 status_t Parcel::write(const Flattenable<T>& val) { 570 const FlattenableHelper<T> helper(val); 571 return write(helper); 572 } 573 574 template<typename T> 575 status_t Parcel::write(const LightFlattenable<T>& val) { 576 size_t size(val.getFlattenedSize()); 577 if (!val.isFixedSize()) { 578 if (size > INT32_MAX) { 579 return BAD_VALUE; 580 } 581 status_t err = writeInt32(static_cast<int32_t>(size)); 582 if (err != NO_ERROR) { 583 return err; 584 } 585 } 586 if (size) { 587 void* buffer = writeInplace(size); 588 if (buffer == NULL) 589 return NO_MEMORY; 590 return val.flatten(buffer, size); 591 } 592 return NO_ERROR; 593 } 594 595 template<typename T> 596 status_t Parcel::read(Flattenable<T>& val) const { 597 FlattenableHelper<T> helper(val); 598 return read(helper); 599 } 600 601 template<typename T> 602 status_t Parcel::read(LightFlattenable<T>& val) const { 603 size_t size; 604 if (val.isFixedSize()) { 605 size = val.getFlattenedSize(); 606 } else { 607 int32_t s; 608 status_t err = readInt32(&s); 609 if (err != NO_ERROR) { 610 return err; 611 } 612 size = static_cast<size_t>(s); 613 } 614 if (size) { 615 void const* buffer = readInplace(size); 616 return buffer == NULL ? NO_MEMORY : 617 val.unflatten(buffer, size); 618 } 619 return NO_ERROR; 620 } 621 622 template<typename T> 623 status_t Parcel::writeVectorSize(const std::vector<T>& val) { 624 if (val.size() > INT32_MAX) { 625 return BAD_VALUE; 626 } 627 return writeInt32(static_cast<int32_t>(val.size())); 628 } 629 630 template<typename T> 631 status_t Parcel::writeVectorSize(const std::unique_ptr<std::vector<T>>& val) { 632 if (!val) { 633 return writeInt32(-1); 634 } 635 636 return writeVectorSize(*val); 637 } 638 639 template<typename T> 640 status_t Parcel::resizeOutVector(std::vector<T>* val) const { 641 int32_t size; 642 status_t err = readInt32(&size); 643 if (err != NO_ERROR) { 644 return err; 645 } 646 647 if (size < 0) { 648 return UNEXPECTED_NULL; 649 } 650 val->resize(size_t(size)); 651 return OK; 652 } 653 654 template<typename T> 655 status_t Parcel::resizeOutVector(std::unique_ptr<std::vector<T>>* val) const { 656 int32_t size; 657 status_t err = readInt32(&size); 658 if (err != NO_ERROR) { 659 return err; 660 } 661 662 val->reset(); 663 if (size >= 0) { 664 val->reset(new std::vector<T>(size_t(size))); 665 } 666 667 return OK; 668 } 669 670 template<typename T> 671 status_t Parcel::readStrongBinder(sp<T>* val) const { 672 sp<IBinder> tmp; 673 status_t ret = readStrongBinder(&tmp); 674 675 if (ret == OK) { 676 *val = interface_cast<T>(tmp); 677 678 if (val->get() == nullptr) { 679 return UNKNOWN_ERROR; 680 } 681 } 682 683 return ret; 684 } 685 686 template<typename T> 687 status_t Parcel::readNullableStrongBinder(sp<T>* val) const { 688 sp<IBinder> tmp; 689 status_t ret = readNullableStrongBinder(&tmp); 690 691 if (ret == OK) { 692 *val = interface_cast<T>(tmp); 693 694 if (val->get() == nullptr && tmp.get() != nullptr) { 695 ret = UNKNOWN_ERROR; 696 } 697 } 698 699 return ret; 700 } 701 702 template<typename T, typename U> 703 status_t Parcel::unsafeReadTypedVector( 704 std::vector<T>* val, 705 status_t(Parcel::*read_func)(U*) const) const { 706 int32_t size; 707 status_t status = this->readInt32(&size); 708 709 if (status != OK) { 710 return status; 711 } 712 713 if (size < 0) { 714 return UNEXPECTED_NULL; 715 } 716 717 if (val->max_size() < static_cast<size_t>(size)) { 718 return NO_MEMORY; 719 } 720 721 val->resize(static_cast<size_t>(size)); 722 723 if (val->size() < static_cast<size_t>(size)) { 724 return NO_MEMORY; 725 } 726 727 for (auto& v: *val) { 728 status = (this->*read_func)(&v); 729 730 if (status != OK) { 731 return status; 732 } 733 } 734 735 return OK; 736 } 737 738 template<typename T> 739 status_t Parcel::readTypedVector(std::vector<T>* val, 740 status_t(Parcel::*read_func)(T*) const) const { 741 return unsafeReadTypedVector(val, read_func); 742 } 743 744 template<typename T> 745 status_t Parcel::readNullableTypedVector(std::unique_ptr<std::vector<T>>* val, 746 status_t(Parcel::*read_func)(T*) const) const { 747 const size_t start = dataPosition(); 748 int32_t size; 749 status_t status = readInt32(&size); 750 val->reset(); 751 752 if (status != OK || size < 0) { 753 return status; 754 } 755 756 setDataPosition(start); 757 val->reset(new std::vector<T>()); 758 759 status = unsafeReadTypedVector(val->get(), read_func); 760 761 if (status != OK) { 762 val->reset(); 763 } 764 765 return status; 766 } 767 768 template<typename T, typename U> 769 status_t Parcel::unsafeWriteTypedVector(const std::vector<T>& val, 770 status_t(Parcel::*write_func)(U)) { 771 if (val.size() > std::numeric_limits<int32_t>::max()) { 772 return BAD_VALUE; 773 } 774 775 status_t status = this->writeInt32(static_cast<int32_t>(val.size())); 776 777 if (status != OK) { 778 return status; 779 } 780 781 for (const auto& item : val) { 782 status = (this->*write_func)(item); 783 784 if (status != OK) { 785 return status; 786 } 787 } 788 789 return OK; 790 } 791 792 template<typename T> 793 status_t Parcel::writeTypedVector(const std::vector<T>& val, 794 status_t(Parcel::*write_func)(const T&)) { 795 return unsafeWriteTypedVector(val, write_func); 796 } 797 798 template<typename T> 799 status_t Parcel::writeTypedVector(const std::vector<T>& val, 800 status_t(Parcel::*write_func)(T)) { 801 return unsafeWriteTypedVector(val, write_func); 802 } 803 804 template<typename T> 805 status_t Parcel::writeNullableTypedVector(const std::unique_ptr<std::vector<T>>& val, 806 status_t(Parcel::*write_func)(const T&)) { 807 if (val.get() == nullptr) { 808 return this->writeInt32(-1); 809 } 810 811 return unsafeWriteTypedVector(*val, write_func); 812 } 813 814 template<typename T> 815 status_t Parcel::writeNullableTypedVector(const std::unique_ptr<std::vector<T>>& val, 816 status_t(Parcel::*write_func)(T)) { 817 if (val.get() == nullptr) { 818 return this->writeInt32(-1); 819 } 820 821 return unsafeWriteTypedVector(*val, write_func); 822 } 823 824 template<typename T> 825 status_t Parcel::readParcelableVector(std::vector<T>* val) const { 826 return unsafeReadTypedVector<T, Parcelable>(val, &Parcel::readParcelable); 827 } 828 829 template<typename T> 830 status_t Parcel::readParcelableVector(std::unique_ptr<std::vector<std::unique_ptr<T>>>* val) const { 831 const size_t start = dataPosition(); 832 int32_t size; 833 status_t status = readInt32(&size); 834 val->reset(); 835 836 if (status != OK || size < 0) { 837 return status; 838 } 839 840 setDataPosition(start); 841 val->reset(new std::vector<std::unique_ptr<T>>()); 842 843 status = unsafeReadTypedVector(val->get(), &Parcel::readParcelable<T>); 844 845 if (status != OK) { 846 val->reset(); 847 } 848 849 return status; 850 } 851 852 template<typename T> 853 status_t Parcel::readParcelable(std::unique_ptr<T>* parcelable) const { 854 const size_t start = dataPosition(); 855 int32_t present; 856 status_t status = readInt32(&present); 857 parcelable->reset(); 858 859 if (status != OK || !present) { 860 return status; 861 } 862 863 setDataPosition(start); 864 parcelable->reset(new T()); 865 866 status = readParcelable(parcelable->get()); 867 868 if (status != OK) { 869 parcelable->reset(); 870 } 871 872 return status; 873 } 874 875 template<typename T> 876 status_t Parcel::writeNullableParcelable(const std::unique_ptr<T>& parcelable) { 877 return writeRawNullableParcelable(parcelable.get()); 878 } 879 880 template<typename T> 881 status_t Parcel::writeParcelableVector(const std::vector<T>& val) { 882 return unsafeWriteTypedVector<T,const Parcelable&>(val, &Parcel::writeParcelable); 883 } 884 885 template<typename T> 886 status_t Parcel::writeParcelableVector(const std::unique_ptr<std::vector<std::unique_ptr<T>>>& val) { 887 if (val.get() == nullptr) { 888 return this->writeInt32(-1); 889 } 890 891 return unsafeWriteTypedVector(*val, &Parcel::writeNullableParcelable<T>); 892 } 893 894 template<typename T> 895 status_t Parcel::writeParcelableVector(const std::shared_ptr<std::vector<std::unique_ptr<T>>>& val) { 896 if (val.get() == nullptr) { 897 return this->writeInt32(-1); 898 } 899 900 return unsafeWriteTypedVector(*val, &Parcel::writeNullableParcelable<T>); 901 } 902 903 // --------------------------------------------------------------------------- 904 905 inline TextOutput& operator<<(TextOutput& to, const Parcel& parcel) 906 { 907 parcel.print(to); 908 return to; 909 } 910 911 // --------------------------------------------------------------------------- 912 913 // Generic acquire and release of objects. 914 void acquire_object(const sp<ProcessState>& proc, 915 const flat_binder_object& obj, const void* who); 916 void release_object(const sp<ProcessState>& proc, 917 const flat_binder_object& obj, const void* who); 918 919 void flatten_binder(const sp<ProcessState>& proc, 920 const sp<IBinder>& binder, flat_binder_object* out); 921 void flatten_binder(const sp<ProcessState>& proc, 922 const wp<IBinder>& binder, flat_binder_object* out); 923 status_t unflatten_binder(const sp<ProcessState>& proc, 924 const flat_binder_object& flat, sp<IBinder>* out); 925 status_t unflatten_binder(const sp<ProcessState>& proc, 926 const flat_binder_object& flat, wp<IBinder>* out); 927 928 }; // namespace android 929 930 // --------------------------------------------------------------------------- 931 932 #endif // ANDROID_PARCEL_H 933
