feat: add export / file packing

destrum/src/Assets/AssetDatabase.cpp

@@ -3,7 +3,6 @@
 #include <charconv>
 #include <filesystem>
 #include <format>
-#include <fstream>
 #include <random>
 
 #include <spdlog/spdlog.h>
@@ -19,12 +18,9 @@ namespace {
 
     [[nodiscard]] std::optional<AssetGuid> ReadMetaFile(const std::filesystem::path& path)
     {
-        std::ifstream file(path);
-        if (!file) {
-            return std::nullopt;
-        }
         try {
-            const auto meta = nlohmann::json::parse(file);
+            const std::vector<std::uint8_t> bytes = AssetFS::GetInstance().ReadFile(path);
+            const auto meta = nlohmann::json::parse(bytes.begin(), bytes.end());
             return AssetGuid::Parse(meta.at("guid").get<std::string>());
         } catch (const std::exception& exception) {
             spdlog::warn("Ignoring broken asset meta file {}: {}", path.string(), exception.what());
@@ -83,14 +79,14 @@ void AssetDatabase::Clear()
 void AssetDatabase::Refresh()
 {
     Clear();
-    for (const FSMount& mount : AssetFS::GetInstance().GetMounts()) {
-        std::error_code error;
-        for (const auto& entry : std::filesystem::recursive_directory_iterator(mount.root, error)) {
-            if (!entry.is_regular_file(error) || !AssetTypes::IsMeta(entry.path().string())) {
+    const auto& assetFs = AssetFS::GetInstance();
+    for (const FSMount& mount : assetFs.GetMounts()) {
+        for (const std::filesystem::path& file : assetFs.ListFiles(mount)) {
+            if (!AssetTypes::IsMeta(file.string())) {
                 continue;
             }
-            if (const auto guid = ReadMetaFile(entry.path())) {
-                std::filesystem::path asset = entry.path();
+            if (const auto guid = ReadMetaFile(file)) {
+                std::filesystem::path asset = file;
                 asset.replace_extension();
                 Register(mount.scheme + "://" + asset.lexically_relative(mount.root).generic_string(), *guid);
             }
@@ -131,8 +127,7 @@ std::optional<AssetGuid> AssetDatabase::GuidForSave(std::string_view path)
     }
 
     auto& assetFs = AssetFS::GetInstance();
-    std::error_code error;
-    if (!std::filesystem::is_regular_file(assetFs.GetFullPath(path), error)) {
+    if (!assetFs.Exists(assetFs.GetFullPath(path))) {
         return std::nullopt;
     }