SharedRegionParcelable.cpp revision c0c70e3c7dd10bc2c0caffcab1f3f5fb406b35fb 
1/*
2 * Copyright 2016 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#define LOG_TAG "AAudio"
18//#define LOG_NDEBUG 0
19#include <utils/Log.h>
20
21#include <stdint.h>
22
23#include <sys/mman.h>
24#include <binder/Parcelable.h>
25
26#include <aaudio/AAudioDefinitions.h>
27
28#include "binding/SharedMemoryParcelable.h"
29#include "binding/SharedRegionParcelable.h"
30
31using android::NO_ERROR;
32using android::status_t;
33using android::Parcel;
34using android::Parcelable;
35
36using namespace aaudio;
37
38SharedRegionParcelable::SharedRegionParcelable() {}
39SharedRegionParcelable::~SharedRegionParcelable() {}
40
41void SharedRegionParcelable::setup(int32_t sharedMemoryIndex,
42                                   int32_t offsetInBytes,
43                                   int32_t sizeInBytes) {
44    mSharedMemoryIndex = sharedMemoryIndex;
45    mOffsetInBytes = offsetInBytes;
46    mSizeInBytes = sizeInBytes;
47}
48
49status_t SharedRegionParcelable::writeToParcel(Parcel* parcel) const {
50    parcel->writeInt32(mSizeInBytes);
51    if (mSizeInBytes > 0) {
52        parcel->writeInt32(mSharedMemoryIndex);
53        parcel->writeInt32(mOffsetInBytes);
54    }
55    return NO_ERROR; // TODO check for errors above
56}
57
58status_t SharedRegionParcelable::readFromParcel(const Parcel* parcel) {
59    parcel->readInt32(&mSizeInBytes);
60    if (mSizeInBytes > 0) {
61        parcel->readInt32(&mSharedMemoryIndex);
62        parcel->readInt32(&mOffsetInBytes);
63    }
64    return NO_ERROR; // TODO check for errors above
65}
66
67aaudio_result_t SharedRegionParcelable::resolve(SharedMemoryParcelable *memoryParcels,
68                                              void **regionAddressPtr) {
69    if (mSizeInBytes == 0) {
70        *regionAddressPtr = nullptr;
71        return AAUDIO_OK;
72    }
73    if (mSharedMemoryIndex < 0) {
74        ALOGE("SharedRegionParcelable invalid mSharedMemoryIndex = %d", mSharedMemoryIndex);
75        return AAUDIO_ERROR_INTERNAL;
76    }
77    SharedMemoryParcelable *memoryParcel = &memoryParcels[mSharedMemoryIndex];
78    return memoryParcel->resolve(mOffsetInBytes, mSizeInBytes, regionAddressPtr);
79}
80
81aaudio_result_t SharedRegionParcelable::validate() {
82    if (mSizeInBytes < 0 || mSizeInBytes >= MAX_MMAP_SIZE_BYTES) {
83        ALOGE("SharedRegionParcelable invalid mSizeInBytes = %d", mSizeInBytes);
84        return AAUDIO_ERROR_OUT_OF_RANGE;
85    }
86    if (mSizeInBytes > 0) {
87        if (mOffsetInBytes < 0 || mOffsetInBytes >= MAX_MMAP_OFFSET_BYTES) {
88            ALOGE("SharedRegionParcelable invalid mOffsetInBytes = %d", mOffsetInBytes);
89            return AAUDIO_ERROR_OUT_OF_RANGE;
90        }
91        if (mSharedMemoryIndex < 0 || mSharedMemoryIndex >= MAX_SHARED_MEMORIES) {
92            ALOGE("SharedRegionParcelable invalid mSharedMemoryIndex = %d", mSharedMemoryIndex);
93            return AAUDIO_ERROR_INTERNAL;
94        }
95    }
96    return AAUDIO_OK;
97}
98
99void SharedRegionParcelable::dump() {
100    ALOGD("SharedRegionParcelable mSizeInBytes = %d -----", mSizeInBytes);
101    if (mSizeInBytes > 0) {
102        ALOGD("SharedRegionParcelable mSharedMemoryIndex = %d", mSharedMemoryIndex);
103        ALOGD("SharedRegionParcelable mOffsetInBytes = %d", mOffsetInBytes);
104    }
105}
106