/*
	This file is part of Fennix Kernel.

	Fennix Kernel is free software: you can redistribute it and/or
	modify it under the terms of the GNU General Public License as
	published by the Free Software Foundation, either version 3 of
	the License, or (at your option) any later version.

	Fennix Kernel is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
*/

#ifndef __FENNIX_KERNEL_FILESYSTEM_USTAR_H__
#define __FENNIX_KERNEL_FILESYSTEM_USTAR_H__

#include <types.h>

#include <filesystem.hpp>

namespace vfs
{
	class USTARNode : public Node
	{
	private:
		uintptr_t Address;

	public:
		size_t read(uint8_t *Buffer, size_t Size, off_t Offset) final;

		USTARNode(uintptr_t Address, const char *Name, NodeType Type,
				  Virtual *vfs_ctx);

		~USTARNode();
	};

	class USTAR
	{

		enum FileType
		{
			REGULAR_FILE = '0',
			HARDLINK = '1',
			SYMLINK = '2',
			CHARDEV = '3',
			BLOCKDEV = '4',
			DIRECTORY = '5',
			FIFO = '6'
		};

		struct FileHeader
		{
			char name[100];
			char mode[8];
			char uid[8];
			char gid[8];
			char size[12];
			char mtime[12];
			char chksum[8];
			char typeflag[1];
			char link[100];
			char signature[6];
			char version[2];
			char owner[32];
			char group[32];
			char dev_maj[8];
			char dev_min[8];
			char prefix[155];
			char pad[12];
		};

	private:
		inline uint32_t GetSize(const char *String)
		{
			uint32_t ret = 0;
			while (*String)
			{
				ret *= 8;
				ret += *String - '0';
				String++;
			}
			return ret;
		}

		inline int StringToInt(const char *String)
		{
			int ret = 0;
			for (int i = 0; String[i] != '\0'; ++i)
				ret = ret * 10 + String[i] - '0';
			return ret;
		}

	public:
		bool TestArchive(uintptr_t Address);
		void ReadArchive(uintptr_t Address, Virtual *vfs_ctx);
		USTAR();
		~USTAR();
	};
}

#endif // !__FENNIX_KERNEL_FILESYSTEM_USTAR_H__