1 files changed, 124 insertions, 0 deletions
diff --git a/cmds/bootanimation/iot/BootParameters.cpp b/cmds/bootanimation/iot/BootParameters.cpp
new file mode 100644
index 000000000000..da6ad0d1f08f
--- /dev/null
+++ b/cmds/bootanimation/iot/BootParameters.cpp
@@ -0,0 +1,124 @@
+/*
+ * 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