HidlBinderSupport.cpp revision 1f535a27054e7553e968cac664981073f0074009
17f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong/* 27f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * Copyright (C) 2016 The Android Open Source Project 37f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * 47f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * Licensed under the Apache License, Version 2.0 (the "License"); 57f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * you may not use this file except in compliance with the License. 67f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * You may obtain a copy of the License at 77f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * 87f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * http://www.apache.org/licenses/LICENSE-2.0 97f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * 107f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * Unless required by applicable law or agreed to in writing, software 117f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * distributed under the License is distributed on an "AS IS" BASIS, 127f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 137f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * See the License for the specific language governing permissions and 147f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong * limitations under the License. 157f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong */ 167f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 177f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong#define LOG_TAG "HidlSupport" 187f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 197f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong#include <hidl/HidlBinderSupport.h> 207f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 217f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong#ifdef LIBHIDL_TARGET_DEBUGGABLE 227f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong#include <android-base/logging.h> 237f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong#endif 247f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 257f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hongnamespace android { 267f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hongnamespace hardware { 277f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 283079100878a2595be644d866e67c12a9de620fd5Martijn Coenenconst size_t hidl_memory::kOffsetOfHandle = offsetof(hidl_memory, mHandle); 293079100878a2595be644d866e67c12a9de620fd5Martijn Coenenconst size_t hidl_memory::kOffsetOfName = offsetof(hidl_memory, mName); 303079100878a2595be644d866e67c12a9de620fd5Martijn Coenen 313079100878a2595be644d866e67c12a9de620fd5Martijn Coenenstatus_t readEmbeddedFromParcel(hidl_memory * /* memory */, 323079100878a2595be644d866e67c12a9de620fd5Martijn Coenen const Parcel &parcel, size_t parentHandle, size_t parentOffset) { 331f535a27054e7553e968cac664981073f0074009Steven Moreland const native_handle_t *handle; 341f535a27054e7553e968cac664981073f0074009Steven Moreland ::android::status_t _hidl_err = parcel.readNullableEmbeddedNativeHandle( 353079100878a2595be644d866e67c12a9de620fd5Martijn Coenen parentHandle, 361f535a27054e7553e968cac664981073f0074009Steven Moreland parentOffset + hidl_memory::kOffsetOfHandle, 371f535a27054e7553e968cac664981073f0074009Steven Moreland &handle); 383079100878a2595be644d866e67c12a9de620fd5Martijn Coenen 391f535a27054e7553e968cac664981073f0074009Steven Moreland if (_hidl_err == ::android::OK) { 401f535a27054e7553e968cac664981073f0074009Steven Moreland _hidl_err = readEmbeddedFromParcel( 411f535a27054e7553e968cac664981073f0074009Steven Moreland (hidl_string*) nullptr, 421f535a27054e7553e968cac664981073f0074009Steven Moreland parcel, 431f535a27054e7553e968cac664981073f0074009Steven Moreland parentHandle, 441f535a27054e7553e968cac664981073f0074009Steven Moreland parentOffset + hidl_memory::kOffsetOfName); 453079100878a2595be644d866e67c12a9de620fd5Martijn Coenen } 463079100878a2595be644d866e67c12a9de620fd5Martijn Coenen 473079100878a2595be644d866e67c12a9de620fd5Martijn Coenen return _hidl_err; 483079100878a2595be644d866e67c12a9de620fd5Martijn Coenen} 493079100878a2595be644d866e67c12a9de620fd5Martijn Coenen 503079100878a2595be644d866e67c12a9de620fd5Martijn Coenenstatus_t writeEmbeddedToParcel(const hidl_memory &memory, 513079100878a2595be644d866e67c12a9de620fd5Martijn Coenen Parcel *parcel, size_t parentHandle, size_t parentOffset) { 523079100878a2595be644d866e67c12a9de620fd5Martijn Coenen status_t _hidl_err = parcel->writeEmbeddedNativeHandle( 533079100878a2595be644d866e67c12a9de620fd5Martijn Coenen memory.handle(), 543079100878a2595be644d866e67c12a9de620fd5Martijn Coenen parentHandle, 553079100878a2595be644d866e67c12a9de620fd5Martijn Coenen parentOffset + hidl_memory::kOffsetOfHandle); 563079100878a2595be644d866e67c12a9de620fd5Martijn Coenen 573079100878a2595be644d866e67c12a9de620fd5Martijn Coenen if (_hidl_err == ::android::OK) { 583079100878a2595be644d866e67c12a9de620fd5Martijn Coenen _hidl_err = writeEmbeddedToParcel( 593079100878a2595be644d866e67c12a9de620fd5Martijn Coenen memory.name(), 603079100878a2595be644d866e67c12a9de620fd5Martijn Coenen parcel, 613079100878a2595be644d866e67c12a9de620fd5Martijn Coenen parentHandle, 623079100878a2595be644d866e67c12a9de620fd5Martijn Coenen parentOffset + hidl_memory::kOffsetOfName); 633079100878a2595be644d866e67c12a9de620fd5Martijn Coenen } 643079100878a2595be644d866e67c12a9de620fd5Martijn Coenen 653079100878a2595be644d866e67c12a9de620fd5Martijn Coenen return _hidl_err; 663079100878a2595be644d866e67c12a9de620fd5Martijn Coenen} 677f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong// static 687f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hongconst size_t hidl_string::kOffsetOfBuffer = offsetof(hidl_string, mBuffer); 697f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 707f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hongstatus_t readEmbeddedFromParcel(hidl_string * /* string */, 717f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong const Parcel &parcel, size_t parentHandle, size_t parentOffset) { 721f535a27054e7553e968cac664981073f0074009Steven Moreland const void *out; 731f535a27054e7553e968cac664981073f0074009Steven Moreland return parcel.readEmbeddedBuffer( 747f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong nullptr /* buffer_handle */, 757f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong parentHandle, 761f535a27054e7553e968cac664981073f0074009Steven Moreland parentOffset + hidl_string::kOffsetOfBuffer, 771f535a27054e7553e968cac664981073f0074009Steven Moreland &out); 787f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong} 797f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 807f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hongstatus_t writeEmbeddedToParcel(const hidl_string &string, 817f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong Parcel *parcel, size_t parentHandle, size_t parentOffset) { 827f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return parcel->writeEmbeddedBuffer( 837f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong string.c_str(), 847f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong string.size() + 1, 857f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong nullptr /* handle */, 867f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong parentHandle, 877f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong parentOffset + hidl_string::kOffsetOfBuffer); 887f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong} 897f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 907f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hongandroid::status_t writeToParcel(const hidl_version &version, android::hardware::Parcel& parcel) { 917f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return parcel.writeUint32(static_cast<uint32_t>(version.get_major()) << 16 | version.get_minor()); 927f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong} 937f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 947f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Honghidl_version* readFromParcel(const android::hardware::Parcel& parcel) { 957f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong uint32_t version; 967f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong android::status_t status = parcel.readUint32(&version); 977f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (status != OK) { 987f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return nullptr; 997f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } else { 1007f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return new hidl_version(version >> 16, version & 0xFFFF); 1017f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1027f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong} 1037f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1047f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hongstatus_t readFromParcel(Status *s, const Parcel& parcel) { 1057f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong int32_t exception; 1067f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong int32_t errorCode; 1077f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong status_t status = parcel.readInt32(&exception); 1087f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (status != OK) { 1097f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong s->setFromStatusT(status); 1107f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return status; 1117f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1127f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1137f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong // Skip over fat response headers. Not used (or propagated) in native code. 1147f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (exception == Status::EX_HAS_REPLY_HEADER) { 1157f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong // Note that the header size includes the 4 byte size field. 1167f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong const int32_t header_start = parcel.dataPosition(); 1177f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong int32_t header_size; 1187f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong status = parcel.readInt32(&header_size); 1197f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (status != OK) { 1207f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong s->setFromStatusT(status); 1217f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return status; 1227f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1237f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong parcel.setDataPosition(header_start + header_size); 1247f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong // And fat response headers are currently only used when there are no 1257f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong // exceptions, so act like there was no error. 1267f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong exception = Status::EX_NONE; 1277f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1287f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1297f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (exception == Status::EX_NONE) { 1307f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong *s = Status::ok(); 1317f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return status; 1327f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1337f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1347f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong // The remote threw an exception. Get the message back. 1357f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong String16 message; 1367f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong status = parcel.readString16(&message); 1377f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (status != OK) { 1387f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong s->setFromStatusT(status); 1397f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return status; 1407f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1417f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1427f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (exception == Status::EX_SERVICE_SPECIFIC) { 1437f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong status = parcel.readInt32(&errorCode); 1447f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1457f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (status != OK) { 1467f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong s->setFromStatusT(status); 1477f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return status; 1487f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1497f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1507f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (exception == Status::EX_SERVICE_SPECIFIC) { 1517f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong s->setServiceSpecificError(errorCode, String8(message)); 1527f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } else { 1537f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong s->setException(exception, String8(message)); 1547f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1557f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1567f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return status; 1577f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong} 1587f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1597f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hongstatus_t writeToParcel(const Status &s, Parcel* parcel) { 1607f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong // Something really bad has happened, and we're not going to even 1617f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong // try returning rich error data. 1627f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (s.exceptionCode() == Status::EX_TRANSACTION_FAILED) { 1637f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return s.transactionError(); 1647f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1657f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1667f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong status_t status = parcel->writeInt32(s.exceptionCode()); 1677f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (status != OK) { return status; } 1687f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (s.exceptionCode() == Status::EX_NONE) { 1697f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong // We have no more information to write. 1707f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return status; 1717f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1727f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong status = parcel->writeString16(String16(s.exceptionMessage())); 1737f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (s.exceptionCode() != Status::EX_SERVICE_SPECIFIC) { 1747f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong // We have no more information to write. 1757f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return status; 1767f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1777f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong status = parcel->writeInt32(s.serviceSpecificErrorCode()); 1787f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return status; 1797f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong} 1807f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1817f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong} // namespace hardware 1827f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong} // namespace android 183