[nostalgia] Add new pack library to bundle project into OxFS

src/nostalgia/tools/pack/pack.cpp

@@ -0,0 +1,60 @@
+/*
+ * Copyright 2015 - 2019 gtalent2@gmail.com
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include <string_view>
+#include <vector>
+
+#include "imgconv.hpp"
+#include "pack.hpp"
+
+namespace nostalgia {
+
+[[nodiscard]] static constexpr bool endsWith(std::string_view str, std::string_view ending) {
+	return str.size() >= ending.size() && str.substr(str.size() - ending.size()) == ending;
+}
+
+// stub for now
+ox::Error pathToInode(std::vector<char> *buff) {
+	return OxError(0);
+}
+
+// stub for now
+ox::Error toMetalClaw(std::vector<char> *buff) {
+	return OxError(0);
+}
+
+ox::Error copy(ox::PassThroughFS *src, ox::FileSystem32 *dest, std::string path) {
+	// copy
+	src->ls(path.c_str(), [src, dest, path](const char *name, ox::InodeId_t inode) {
+		auto stat = src->stat(path.c_str());
+		oxReturnError(stat.error);
+		if (stat.value.fileType == ox::FileType_Directory) {
+			const auto dir = path + name + '/';
+			oxReturnError(dest->mkdir(dir.c_str()));
+			oxReturnError(copy(src, dest, dir));
+		} else {
+			std::vector<char> buff(stat.value.size);
+			// load file
+			oxReturnError(src->read(path.c_str(), buff.data(), buff.size()));
+			// do transforms
+			if (endsWith(path, ".claw")) {
+				oxReturnError(pathToInode(&buff));
+				oxReturnError(toMetalClaw(&buff));
+			} else if (endsWith(path, ".png")) {
+				const auto fullPath = src->basePath() + path;
+				oxReturnError(pngToGba(fullPath.c_str(), 0, 0));
+			}
+			// write file to dest
+			oxReturnError(dest->write(path.c_str(), buff.data(), buff.size()));
+		}
+		return OxError(0);
+	});
+	return OxError(0);
+}
+
+}