libbinder: Add binder::Status type
This object implements equivalent functionality to the Java logic which
serializes and re-throws exceptions from services.
Bug: 25615695
Test: Integration test for generated AIDL code reveals this to work
correctly.
Change-Id: Ic80c9def0dd232582ea9c49717ec50894af6bfc2
diff --git a/libs/binder/Status.cpp b/libs/binder/Status.cpp
new file mode 100644
index 0000000..41fff3d
--- /dev/null
+++ b/libs/binder/Status.cpp
@@ -0,0 +1,133 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <binder/Status.h>
+
+namespace android {
+namespace binder {
+
+Status Status::fromExceptionCode(int32_t exception_code) {
+ return Status(exception_code, "");
+}
+
+Status Status::fromStatusT(status_t status) {
+ Status ret;
+ ret.setFromStatusT(status);
+ return ret;
+}
+
+Status Status::ok() {
+ return Status();
+}
+
+Status::Status(int32_t exception_code, const String8& message)
+ : mException(exception_code),
+ mMessage(message) {}
+
+Status::Status(int32_t exception_code, const char* message)
+ : mException(exception_code),
+ mMessage(message) {}
+
+status_t Status::readFromParcel(const Parcel& parcel) {
+ status_t status = parcel.readInt32(&mException);
+ if (status != OK) {
+ setFromStatusT(status);
+ return status;
+ }
+
+ // Skip over fat response headers. Not used (or propagated) in native code.
+ if (mException == EX_HAS_REPLY_HEADER) {
+ // Note that the header size includes the 4 byte size field.
+ const int32_t header_start = parcel.dataPosition();
+ int32_t header_size;
+ status = parcel.readInt32(&header_size);
+ if (status != OK) {
+ setFromStatusT(status);
+ return status;
+ }
+ parcel.setDataPosition(header_start + header_size);
+ // And fat response headers are currently only used when there are no
+ // exceptions, so act like there was no error.
+ mException = EX_NONE;
+ }
+
+ if (mException == EX_NONE) {
+ return status;
+ }
+
+ // The remote threw an exception. Get the message back.
+ mMessage = String8(parcel.readString16());
+
+ return status;
+}
+
+status_t Status::writeToParcel(Parcel* parcel) const {
+ status_t status = parcel->writeInt32(mException);
+ if (status != OK) { return status; }
+ if (mException == EX_NONE) {
+ // We have no more information to write.
+ return status;
+ }
+ status = parcel->writeString16(String16(mMessage));
+ return status;
+}
+
+void Status::setFromStatusT(status_t status) {
+ switch (status) {
+ case NO_ERROR:
+ mException = EX_NONE;
+ mMessage.clear();
+ break;
+ case UNEXPECTED_NULL:
+ mException = EX_NULL_POINTER;
+ mMessage.setTo("Unexpected null reference in Parcel");
+ break;
+ default:
+ mException = EX_TRANSACTION_FAILED;
+ mMessage.setTo("Transaction failed");
+ break;
+ }
+}
+
+void Status::setException(int32_t ex, const String8& message) {
+ mException = ex;
+ mMessage.setTo(message);
+}
+
+void Status::getException(int32_t* returned_exception,
+ String8* returned_message) const {
+ if (returned_exception) {
+ *returned_exception = mException;
+ }
+ if (returned_message) {
+ returned_message->setTo(mMessage);
+ }
+}
+
+String8 Status::toString8() const {
+ String8 ret;
+ if (mException == EX_NONE) {
+ ret.append("No error");
+ } else {
+ ret.appendFormat("Status(%d): '", mException);
+ ret.append(String8(mMessage));
+ ret.append("'");
+ }
+ return ret;
+}
+
+} // namespace binder
+} // namespace android