Handle corrupted files

src/libslic3r/Preset.cpp

@@ -145,6 +145,9 @@ Semver get_version_from_json(std::string file_path)
         return Semver();
         //throw ConfigurationError(format("Failed loading configuration file \"%1%\": %2%", file_path, err.what()));
     }
+    catch(...) {
+        return Semver();
+    }
 }
 
 //BBS: add a function to load the key-values from xxx.json

src/libslic3r/PresetBundle.cpp

@@ -2202,7 +2202,7 @@ std::pair<PresetsConfigSubstitutions, std::string> PresetBundle::load_system_pre
         const auto t0 = std::chrono::steady_clock::now();
         PresetBundleCache::SystemPresetsCache cache;
         const std::string cache_file = PresetBundleCache::SystemPresetsCache::cache_path();
-        if (cache.load(cache_file)) {
+        if (cache.load(cache_file) && cache.is_plausible()) {
             std::set<std::string> dirty;
             if (cache.get_dirty_vendors(dir.string(), dirty)) {
                 if (dirty.empty()) {
@@ -2230,7 +2230,7 @@ std::pair<PresetsConfigSubstitutions, std::string> PresetBundle::load_system_pre
                     (boost::filesystem::path(resources_dir()) / "profiles").make_preferred().string();
                 PresetBundleCache::SystemPresetsCache bundled;
                 if (bundled.load(PresetBundleCache::SystemPresetsCache::bundled_cache_path()) &&
-                    bundled.is_valid(bundled_dir)) {
+                    bundled.is_valid(bundled_dir) && bundled.is_plausible()) {
                     bundled.apply(*this);
                     update_system_maps();
                     // Promote to user cache so subsequent launches skip this check.

src/libslic3r/PresetBundleCache.hpp

@@ -122,6 +122,13 @@ struct SystemPresetsCache {
     static std::string cache_path();
     static std::string bundled_cache_path();
     bool is_valid(const std::string& system_dir) const;
+    // Rejects caches that loaded structurally but contain no data or are internally inconsistent
+    // (e.g. vendor_versions lists all vendors but vendor_profiles only captured some of them).
+    bool is_plausible() const {
+        return !vendor_profiles.empty() &&
+               !printer_presets.empty() &&
+               vendor_versions.size() == vendor_profiles.size();
+    }
     // Returns false on structural mismatch (full re-parse required).
     // On true, populates out_dirty with vendor IDs whose version strings changed.
     // Empty out_dirty means fully valid (cache hit, no re-parse needed).