HidlBinderSupport.cpp revision 7f97f44562b057c3c780c0a05c101b677f9b0f96
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 287f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hongstd::map<std::string, std::function<sp<IBinder>(void*)>> gBnConstructorMap{}; 297f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 307f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong// static 317f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hongconst size_t hidl_string::kOffsetOfBuffer = offsetof(hidl_string, mBuffer); 327f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 337f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hongstatus_t readEmbeddedFromParcel(hidl_string * /* string */, 347f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong const Parcel &parcel, size_t parentHandle, size_t parentOffset) { 357f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong const void *ptr = parcel.readEmbeddedBuffer( 367f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong nullptr /* buffer_handle */, 377f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong parentHandle, 387f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong parentOffset + hidl_string::kOffsetOfBuffer); 397f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 407f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return ptr != NULL ? OK : UNKNOWN_ERROR; 417f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong} 427f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 437f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hongstatus_t writeEmbeddedToParcel(const hidl_string &string, 447f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong Parcel *parcel, size_t parentHandle, size_t parentOffset) { 457f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return parcel->writeEmbeddedBuffer( 467f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong string.c_str(), 477f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong string.size() + 1, 487f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong nullptr /* handle */, 497f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong parentHandle, 507f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong parentOffset + hidl_string::kOffsetOfBuffer); 517f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong} 527f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 537f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hongandroid::status_t writeToParcel(const hidl_version &version, android::hardware::Parcel& parcel) { 547f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return parcel.writeUint32(static_cast<uint32_t>(version.get_major()) << 16 | version.get_minor()); 557f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong} 567f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 577f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Honghidl_version* readFromParcel(const android::hardware::Parcel& parcel) { 587f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong uint32_t version; 597f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong android::status_t status = parcel.readUint32(&version); 607f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (status != OK) { 617f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return nullptr; 627f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } else { 637f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return new hidl_version(version >> 16, version & 0xFFFF); 647f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 657f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong} 667f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 677f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hongstatus_t readFromParcel(Status *s, const Parcel& parcel) { 687f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong int32_t exception; 697f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong int32_t errorCode; 707f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong status_t status = parcel.readInt32(&exception); 717f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (status != OK) { 727f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong s->setFromStatusT(status); 737f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return status; 747f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 757f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 767f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong // Skip over fat response headers. Not used (or propagated) in native code. 777f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (exception == Status::EX_HAS_REPLY_HEADER) { 787f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong // Note that the header size includes the 4 byte size field. 797f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong const int32_t header_start = parcel.dataPosition(); 807f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong int32_t header_size; 817f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong status = parcel.readInt32(&header_size); 827f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (status != OK) { 837f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong s->setFromStatusT(status); 847f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return status; 857f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 867f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong parcel.setDataPosition(header_start + header_size); 877f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong // And fat response headers are currently only used when there are no 887f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong // exceptions, so act like there was no error. 897f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong exception = Status::EX_NONE; 907f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 917f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 927f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (exception == Status::EX_NONE) { 937f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong *s = Status::ok(); 947f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return status; 957f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 967f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 977f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong // The remote threw an exception. Get the message back. 987f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong String16 message; 997f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong status = parcel.readString16(&message); 1007f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (status != OK) { 1017f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong s->setFromStatusT(status); 1027f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return status; 1037f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1047f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1057f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (exception == Status::EX_SERVICE_SPECIFIC) { 1067f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong status = parcel.readInt32(&errorCode); 1077f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1087f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (status != OK) { 1097f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong s->setFromStatusT(status); 1107f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return status; 1117f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1127f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1137f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (exception == Status::EX_SERVICE_SPECIFIC) { 1147f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong s->setServiceSpecificError(errorCode, String8(message)); 1157f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } else { 1167f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong s->setException(exception, String8(message)); 1177f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1187f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1197f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return status; 1207f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong} 1217f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1227f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hongstatus_t writeToParcel(const Status &s, Parcel* parcel) { 1237f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong // Something really bad has happened, and we're not going to even 1247f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong // try returning rich error data. 1257f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (s.exceptionCode() == Status::EX_TRANSACTION_FAILED) { 1267f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return s.transactionError(); 1277f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1287f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1297f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong status_t status = parcel->writeInt32(s.exceptionCode()); 1307f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (status != OK) { return status; } 1317f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (s.exceptionCode() == Status::EX_NONE) { 1327f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong // We have no more information to write. 1337f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return status; 1347f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1357f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong status = parcel->writeString16(String16(s.exceptionMessage())); 1367f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong if (s.exceptionCode() != Status::EX_SERVICE_SPECIFIC) { 1377f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong // We have no more information to write. 1387f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return status; 1397f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong } 1407f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong status = parcel->writeInt32(s.serviceSpecificErrorCode()); 1417f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong return status; 1427f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong} 1437f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong 1447f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong} // namespace hardware 1457f97f44562b057c3c780c0a05c101b677f9b0f96Yifan Hong} // namespace android 146