David Pursell | 54a8fe4 | 2017-09-29 16:05:26 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2017 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 "BootParameters.h" |
| 18 | |
| 19 | #define LOG_TAG "BootParameters" |
| 20 | |
| 21 | #include <fcntl.h> |
| 22 | |
| 23 | #include <string> |
| 24 | |
| 25 | #include <android-base/file.h> |
| 26 | #include <base/json/json_parser.h> |
| 27 | #include <base/json/json_reader.h> |
| 28 | #include <base/json/json_value_converter.h> |
| 29 | #include <utils/Log.h> |
| 30 | |
| 31 | using android::base::RemoveFileIfExists; |
| 32 | using android::base::ReadFileToString; |
| 33 | using base::JSONReader; |
| 34 | using base::JSONValueConverter; |
| 35 | using base::Value; |
| 36 | |
| 37 | namespace android { |
| 38 | |
| 39 | namespace { |
| 40 | |
| 41 | // Brightness and volume are stored as integer strings in next_boot.json. |
| 42 | // They are divided by this constant to produce the actual float values in |
| 43 | // range [0.0, 1.0]. This constant must match its counterpart in |
| 44 | // DeviceManager. |
| 45 | constexpr const float kFloatScaleFactor = 1000.0f; |
| 46 | |
| 47 | constexpr const char* kNextBootFile = "/data/misc/bootanimation/next_boot.json"; |
| 48 | constexpr const char* kLastBootFile = "/data/misc/bootanimation/last_boot.json"; |
| 49 | |
| 50 | void swapBootConfigs() { |
| 51 | // rename() will fail if next_boot.json doesn't exist, so delete |
| 52 | // last_boot.json manually first. |
| 53 | std::string err; |
| 54 | if (!RemoveFileIfExists(kLastBootFile, &err)) |
| 55 | ALOGE("Unable to delete last boot file: %s", err.c_str()); |
| 56 | |
| 57 | if (rename(kNextBootFile, kLastBootFile) && errno != ENOENT) |
| 58 | ALOGE("Unable to swap boot files: %s", strerror(errno)); |
| 59 | |
| 60 | int fd = open(kNextBootFile, O_CREAT, DEFFILEMODE); |
| 61 | if (fd == -1) { |
| 62 | ALOGE("Unable to create next boot file: %s", strerror(errno)); |
| 63 | } else { |
| 64 | // Make next_boot.json writable to everyone so DeviceManagementService |
| 65 | // can save saved_parameters there. |
| 66 | if (fchmod(fd, DEFFILEMODE)) |
| 67 | ALOGE("Unable to set next boot file permissions: %s", strerror(errno)); |
| 68 | close(fd); |
| 69 | } |
| 70 | } |
| 71 | |
| 72 | } // namespace |
| 73 | |
| 74 | BootParameters::SavedBootParameters::SavedBootParameters() |
| 75 | : brightness(-kFloatScaleFactor), volume(-kFloatScaleFactor) {} |
| 76 | |
| 77 | void BootParameters::SavedBootParameters::RegisterJSONConverter( |
| 78 | JSONValueConverter<SavedBootParameters>* converter) { |
| 79 | converter->RegisterIntField("brightness", &SavedBootParameters::brightness); |
| 80 | converter->RegisterIntField("volume", &SavedBootParameters::volume); |
| 81 | converter->RegisterRepeatedString("param_names", |
| 82 | &SavedBootParameters::param_names); |
| 83 | converter->RegisterRepeatedString("param_values", |
| 84 | &SavedBootParameters::param_values); |
| 85 | } |
| 86 | |
| 87 | BootParameters::BootParameters() { |
| 88 | swapBootConfigs(); |
| 89 | loadParameters(); |
| 90 | } |
| 91 | |
| 92 | void BootParameters::loadParameters() { |
| 93 | std::string contents; |
| 94 | if (!ReadFileToString(kLastBootFile, &contents)) { |
| 95 | if (errno != ENOENT) |
| 96 | ALOGE("Unable to read from %s: %s", kLastBootFile, strerror(errno)); |
| 97 | |
| 98 | return; |
| 99 | } |
| 100 | |
| 101 | std::unique_ptr<Value> json = JSONReader::Read(contents); |
| 102 | if (json.get() == nullptr) { |
| 103 | return; |
| 104 | } |
| 105 | |
| 106 | JSONValueConverter<SavedBootParameters> converter; |
| 107 | if (converter.Convert(*(json.get()), &mRawParameters)) { |
| 108 | mBrightness = mRawParameters.brightness / kFloatScaleFactor; |
| 109 | mVolume = mRawParameters.volume / kFloatScaleFactor; |
| 110 | |
| 111 | if (mRawParameters.param_names.size() == mRawParameters.param_values.size()) { |
| 112 | for (size_t i = 0; i < mRawParameters.param_names.size(); i++) { |
| 113 | mParameters.push_back({ |
| 114 | .key = mRawParameters.param_names[i]->c_str(), |
| 115 | .value = mRawParameters.param_values[i]->c_str() |
| 116 | }); |
| 117 | } |
| 118 | } else { |
| 119 | ALOGW("Parameter names and values size mismatch"); |
| 120 | } |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | } // namespace android |