Add `compressionLevel` argument to `system::archiveFolder()`.

include/system.hpp

@@ -111,7 +111,7 @@ An equivalent shell command is
 
 	tar -cf archivePath --zstd -C folderPath .
 */
-void archiveFolder(const std::string& archivePath, const std::string& folderPath);
+void archiveFolder(const std::string& archivePath, const std::string& folderPath, int compressionLevel = 1);
 /** Extracts an archive into a folder.
 An equivalent shell command is
 

src/patch.cpp

@@ -63,7 +63,8 @@ void PatchManager::save(std::string path) {
 	saveAutosave();
 
 	uint64_t startTime = system::getNanoseconds();
-	system::archiveFolder(path, asset::autosavePath);
+	// Set compression level to 1 so that a 500MB/s SSD is almost bottlenecked
+	system::archiveFolder(path, asset::autosavePath, 1);
 	uint64_t endTime = system::getNanoseconds();
 	INFO("Archived patch in %lf seconds", (endTime - startTime) / 1e9);
 }

src/system.cpp

@@ -288,7 +288,7 @@ static std::string getRelativePath(std::string path, std::string base) {
 }
 
 
-void archiveFolder(const std::string& archivePath, const std::string& folderPath) {
+void archiveFolder(const std::string& archivePath, const std::string& folderPath, int compressionLevel) {
 	// Based on minitar.c create() in libarchive examples
 	int r;
 
@@ -297,8 +297,8 @@ void archiveFolder(const std::string& archivePath, const std::string& folderPath
 	DEFER({archive_write_free(a);});
 	archive_write_set_format_ustar(a);
 	archive_write_add_filter_zstd(a);
-	// Set compression level roughly so that a 500MB/s SSD is bottlenecked
-	r = archive_write_set_filter_option(a, NULL, "compression-level", "1");
+	assert(0 <= compressionLevel && compressionLevel <= 19);
+	r = archive_write_set_filter_option(a, NULL, "compression-level", std::to_string(compressionLevel).c_str());
 	if (r < ARCHIVE_OK)
 		throw Exception(string::f("archiveFolder() could not set filter option: %s", archive_error_string(a)));