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
19namespace android {
20namespace binder {
21
22Status Status::ok() {
23    return Status();
24}
25
26Status Status::fromExceptionCode(int32_t exceptionCode) {
27    return Status(exceptionCode, OK);
28}
29
30Status Status::fromExceptionCode(int32_t exceptionCode,
31                                 const String8& message) {
32    return Status(exceptionCode, OK, message);
33}
34
35Status Status::fromServiceSpecificError(int32_t serviceSpecificErrorCode) {
36    return Status(EX_SERVICE_SPECIFIC, serviceSpecificErrorCode);
37}
38
39Status Status::fromServiceSpecificError(int32_t serviceSpecificErrorCode,
40                                        const String8& message) {
41    return Status(EX_SERVICE_SPECIFIC, serviceSpecificErrorCode, message);
42}
43
44Status Status::fromStatusT(status_t status) {
45    Status ret;
46    ret.setFromStatusT(status);
47    return ret;
48}
49
50Status::Status(int32_t exceptionCode, int32_t errorCode)
51    : mException(exceptionCode),
52      mErrorCode(errorCode) {}
53
54Status::Status(int32_t exceptionCode, int32_t errorCode, const String8& message)
55    : mException(exceptionCode),
56      mErrorCode(errorCode),
57      mMessage(message) {}
58
59status_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
106status_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
128void 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
134void Status::setServiceSpecificError(int32_t errorCode, const String8& message) {
135    setException(EX_SERVICE_SPECIFIC, message);
136    mErrorCode = errorCode;
137}
138
139void Status::setFromStatusT(status_t status) {
140    mException = (status == NO_ERROR) ? EX_NONE : EX_TRANSACTION_FAILED;
141    mErrorCode = status;
142    mMessage.clear();
143}
144
145String8 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