refactor into files

src/main/cpp/assets_manager.cpp

@@ -0,0 +1,21 @@
+#include "assets_manager.h"
+#include <android/asset_manager.h>
+
+void AssetsManager::Init(AAssetManager *asset_manager)
+{
+    m_asset_manager = asset_manager;
+}
+
+std::vector<uint8_t> AssetsManager::ReadAll(const std::string &filename)
+{
+    if (AAsset* asset = AAssetManager_open(m_asset_manager,
+        filename.c_str(), AASSET_MODE_BUFFER))
+    {
+        const auto size = AAsset_getLength(asset);
+        auto buffer = std::vector<uint8_t>(size);
+        AAsset_read(asset, buffer.data(), size);
+        AAsset_close(asset);
+        return buffer;
+    }
+    return {};
+}