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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "BootParameters.h"
#define LOG_TAG "BootParameters"
#include <fcntl.h>
#include <string>
#include <android-base/file.h>
#include <base/json/json_parser.h>
#include <base/json/json_reader.h>
#include <base/json/json_value_converter.h>
#include <utils/Log.h>
using android::base::RemoveFileIfExists;
using android::base::ReadFileToString;
using base::JSONReader;
using base::JSONValueConverter;
using base::Value;
namespace android {
namespace {
// Brightness and volume are stored as integer strings in next_boot.json.
// They are divided by this constant to produce the actual float values in
// range [0.0, 1.0]. This constant must match its counterpart in
// DeviceManager.
constexpr const float kFloatScaleFactor = 1000.0f;
constexpr const char* kNextBootFile = "/data/misc/bootanimation/next_boot.json";
constexpr const char* kLastBootFile = "/data/misc/bootanimation/last_boot.json";
void swapBootConfigs() {
// rename() will fail if next_boot.json doesn't exist, so delete
// last_boot.json manually first.
std::string err;
if (!RemoveFileIfExists(kLastBootFile, &err))
ALOGE("Unable to delete last boot file: %s", err.c_str());
if (rename(kNextBootFile, kLastBootFile) && errno != ENOENT)
ALOGE("Unable to swap boot files: %s", strerror(errno));
int fd = open(kNextBootFile, O_CREAT, DEFFILEMODE);
if (fd == -1) {
ALOGE("Unable to create next boot file: %s", strerror(errno));
} else {
// Make next_boot.json writable to everyone so DeviceManagementService
// can save saved_parameters there.
if (fchmod(fd, DEFFILEMODE))
ALOGE("Unable to set next boot file permissions: %s", strerror(errno));
close(fd);
}
}
} // namespace
BootParameters::SavedBootParameters::SavedBootParameters()
: brightness(-kFloatScaleFactor), volume(-kFloatScaleFactor) {}
void BootParameters::SavedBootParameters::RegisterJSONConverter(
JSONValueConverter<SavedBootParameters>* converter) {
converter->RegisterIntField("brightness", &SavedBootParameters::brightness);
converter->RegisterIntField("volume", &SavedBootParameters::volume);
converter->RegisterRepeatedString("param_names",
&SavedBootParameters::param_names);
converter->RegisterRepeatedString("param_values",
&SavedBootParameters::param_values);
}
BootParameters::BootParameters() {
swapBootConfigs();
loadParameters();
}
void BootParameters::loadParameters() {
std::string contents;
if (!ReadFileToString(kLastBootFile, &contents)) {
if (errno != ENOENT)
ALOGE("Unable to read from %s: %s", kLastBootFile, strerror(errno));
return;
}
std::unique_ptr<Value> json = JSONReader::Read(contents);
if (json.get() == nullptr) {
return;
}
JSONValueConverter<SavedBootParameters> converter;
if (converter.Convert(*(json.get()), &mRawParameters)) {
mBrightness = mRawParameters.brightness / kFloatScaleFactor;
mVolume = mRawParameters.volume / kFloatScaleFactor;
if (mRawParameters.param_names.size() == mRawParameters.param_values.size()) {
for (size_t i = 0; i < mRawParameters.param_names.size(); i++) {
mParameters.push_back({
.key = mRawParameters.param_names[i]->c_str(),
.value = mRawParameters.param_values[i]->c_str()
});
}
} else {
ALOGW("Parameter names and values size mismatch");
}
}
}
} // namespace android
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