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
swapBootConfigs()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
SavedBootParameters()74 BootParameters::SavedBootParameters::SavedBootParameters()
75 : brightness(-kFloatScaleFactor), volume(-kFloatScaleFactor) {}
76
RegisterJSONConverter(JSONValueConverter<SavedBootParameters> * converter)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
BootParameters()87 BootParameters::BootParameters() {
88 swapBootConfigs();
89 loadParameters();
90 }
91
loadParameters()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
125