1 files changed, 66 insertions, 0 deletions

diff --git a/misc_writer/include/misc_writer/misc_writer.h b/misc_writer/include/misc_writer/misc_writer.h
new file mode 100644
index 000000000..6a32ffe46
--- /dev/null
+++ b/misc_writer/include/misc_writer/misc_writer.h
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2019 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.
+ */
+
+#pragma once
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include <optional>
+#include <string>
+
+namespace android {
+namespace hardware {
+namespace google {
+namespace pixel {
+
+enum class MiscWriterActions : int32_t {
+  kSetDarkThemeFlag = 0,
+  kClearDarkThemeFlag,
+  kSetSotaFlag,
+  kClearSotaFlag,
+
+  kUnset = -1,
+};
+
+class MiscWriter {
+ public:
+  static constexpr uint32_t kThemeFlagOffsetInVendorSpace = 0;
+  static constexpr char kDarkThemeFlag[] = "theme-dark";
+  static constexpr uint32_t kSotaFlagOffsetInVendorSpace = 32;
+  static constexpr char kSotaFlag[] = "enable-sota";
+
+  // Returns true of |size| bytes data starting from |offset| is fully inside the vendor space.
+  static bool OffsetAndSizeInVendorSpace(size_t offset, size_t size);
+  // Writes the given data to the vendor space in /misc partition, at the given offset. Note that
+  // offset is in relative to the start of the vendor space.
+  static bool WriteMiscPartitionVendorSpace(const void* data, size_t size, size_t offset,
+                                            std::string* err);
+
+  explicit MiscWriter(const MiscWriterActions& action) : action_(action) {}
+
+  // Performs the stored MiscWriterActions. If |override_offset| is set, writes to the input offset
+  // in the vendor space of /misc instead of the default offset.
+  bool PerformAction(std::optional<size_t> override_offset = std::nullopt);
+
+ private:
+  MiscWriterActions action_{ MiscWriterActions::kUnset };
+};
+
+}  // namespace pixel
+}  // namespace google
+}  // namespace hardware
+}  // namespace android