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      1 /*
      2  * Copyright (C) 2015 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 #include <binder/Status.h>
     18 
     19 namespace android {
     20 namespace binder {
     21 
     22 Status Status::ok() {
     23     return Status();
     24 }
     25 
     26 Status Status::fromExceptionCode(int32_t exceptionCode) {
     27     return Status(exceptionCode, OK);
     28 }
     29 
     30 Status Status::fromExceptionCode(int32_t exceptionCode,
     31                                  const String8& message) {
     32     return Status(exceptionCode, OK, message);
     33 }
     34 
     35 Status Status::fromServiceSpecificError(int32_t serviceSpecificErrorCode) {
     36     return Status(EX_SERVICE_SPECIFIC, serviceSpecificErrorCode);
     37 }
     38 
     39 Status Status::fromServiceSpecificError(int32_t serviceSpecificErrorCode,
     40                                         const String8& message) {
     41     return Status(EX_SERVICE_SPECIFIC, serviceSpecificErrorCode, message);
     42 }
     43 
     44 Status Status::fromStatusT(status_t status) {
     45     Status ret;
     46     ret.setFromStatusT(status);
     47     return ret;
     48 }
     49 
     50 Status::Status(int32_t exceptionCode, int32_t errorCode)
     51     : mException(exceptionCode),
     52       mErrorCode(errorCode) {}
     53 
     54 Status::Status(int32_t exceptionCode, int32_t errorCode, const String8& message)
     55     : mException(exceptionCode),
     56       mErrorCode(errorCode),
     57       mMessage(message) {}
     58 
     59 status_t Status::readFromParcel(const Parcel& parcel) {
     60     status_t status = parcel.readInt32(&mException);
     61     if (status != OK) {
     62         setFromStatusT(status);
     63         return status;
     64     }
     65 
     66     // Skip over fat response headers.  Not used (or propagated) in native code.
     67     if (mException == EX_HAS_REPLY_HEADER) {
     68         // Note that the header size includes the 4 byte size field.
     69         const int32_t header_start = parcel.dataPosition();
     70         int32_t header_size;
     71         status = parcel.readInt32(&header_size);
     72         if (status != OK) {
     73             setFromStatusT(status);
     74             return status;
     75         }
     76         parcel.setDataPosition(header_start + header_size);
     77         // And fat response headers are currently only used when there are no
     78         // exceptions, so act like there was no error.
     79         mException = EX_NONE;
     80     }
     81 
     82     if (mException == EX_NONE) {
     83         return status;
     84     }
     85 
     86     // The remote threw an exception.  Get the message back.
     87     String16 message;
     88     status = parcel.readString16(&message);
     89     if (status != OK) {
     90         setFromStatusT(status);
     91         return status;
     92     }
     93     mMessage = String8(message);
     94 
     95     if (mException == EX_SERVICE_SPECIFIC) {
     96         status = parcel.readInt32(&mErrorCode);
     97     }
     98     if (status != OK) {
     99         setFromStatusT(status);
    100         return status;
    101     }
    102 
    103     return status;
    104 }
    105 
    106 status_t Status::writeToParcel(Parcel* parcel) const {
    107     // Something really bad has happened, and we're not going to even
    108     // try returning rich error data.
    109     if (mException == EX_TRANSACTION_FAILED) {
    110         return mErrorCode;
    111     }
    112 
    113     status_t status = parcel->writeInt32(mException);
    114     if (status != OK) { return status; }
    115     if (mException == EX_NONE) {
    116         // We have no more information to write.
    117         return status;
    118     }
    119     status = parcel->writeString16(String16(mMessage));
    120     if (mException != EX_SERVICE_SPECIFIC) {
    121         // We have no more information to write.
    122         return status;
    123     }
    124     status = parcel->writeInt32(mErrorCode);
    125     return status;
    126 }
    127 
    128 void Status::setException(int32_t ex, const String8& message) {
    129     mException = ex;
    130     mErrorCode = NO_ERROR;  // an exception, not a transaction failure.
    131     mMessage.setTo(message);
    132 }
    133 
    134 void Status::setServiceSpecificError(int32_t errorCode, const String8& message) {
    135     setException(EX_SERVICE_SPECIFIC, message);
    136     mErrorCode = errorCode;
    137 }
    138 
    139 void Status::setFromStatusT(status_t status) {
    140     mException = (status == NO_ERROR) ? EX_NONE : EX_TRANSACTION_FAILED;
    141     mErrorCode = status;
    142     mMessage.clear();
    143 }
    144 
    145 String8 Status::toString8() const {
    146     String8 ret;
    147     if (mException == EX_NONE) {
    148         ret.append("No error");
    149     } else {
    150         ret.appendFormat("Status(%d): '", mException);
    151         if (mException == EX_SERVICE_SPECIFIC ||
    152             mException == EX_TRANSACTION_FAILED) {
    153             ret.appendFormat("%d: ", mErrorCode);
    154         }
    155         ret.append(String8(mMessage));
    156         ret.append("'");
    157     }
    158     return ret;
    159 }
    160 
    161 }  // namespace binder
    162 }  // namespace android
    163