Merge remote-tracking branch 'Kernel/master'

Kernel/include/filesystem/ustar.hpp

@@ -0,0 +1,137 @@
+/*
+	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 <filesystem.hpp>
+
+namespace vfs
+{
+	class USTAR
+	{
+	public:
+		enum TypeFlag
+		{
+			AREGTYPE = '\0',
+			REGTYPE = '0',
+			LNKTYPE = '1',
+			SYMTYPE = '2',
+			CHRTYPE = '3',
+			BLKTYPE = '4',
+			DIRTYPE = '5',
+			FIFOTYPE = '6',
+			CONTTYPE = '7'
+		};
+
+		enum ModeFlag
+		{
+			TSUID = 04000,
+			TSGID = 02000,
+			TSVTX = 01000,
+			TUREAD = 00400,
+			TUWRITE = 00200,
+			TUEXEC = 00100,
+			TGREAD = 00040,
+			TGWRITE = 00020,
+			TGEXEC = 00010,
+			TOREAD = 00004,
+			TOWRITE = 00002,
+			TOEXEC = 00001,
+		};
+
+		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];
+		};
+
+		constexpr static int INODE_CHECKSUM = 0x7757A4;
+
+		struct USTARInode
+		{
+			struct Inode Node;
+			FileHeader *Header;
+			USTARInode *Parent;
+			std::string Name;
+			std::string Path;
+			std::vector<USTARInode *> Children;
+			bool Deleted;
+			int Checksum;
+		};
+
+	private:
+		std::unordered_map<ino_t, USTARInode *> Files;
+
+		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:
+		dev_t DeviceID = -1;
+		ino_t NextInode = 0;
+
+		int Lookup(struct Inode *Parent, const char *Name, struct Inode **Result);
+		int Create(struct Inode *Parent, const char *Name, mode_t Mode, struct Inode **Result);
+		ssize_t Read(struct Inode *Node, void *Buffer, size_t Size, off_t Offset);
+		ssize_t ReadDir(struct Inode *Node, struct kdirent *Buffer, size_t Size, off_t Offset, off_t Entries);
+		int SymLink(struct Inode *Node, const char *Name, const char *Target, struct Inode **Result);
+		ssize_t ReadLink(struct Inode *Node, char *Buffer, size_t Size);
+		int Stat(struct Inode *Node, struct kstat *Stat);
+
+		bool TestArchive(uintptr_t Address);
+		void ReadArchive(uintptr_t Address, size_t Size);
+
+		USTAR(){};
+		~USTAR(){};
+	};
+}
+
+bool TestAndInitializeUSTAR(uintptr_t Address, size_t Size);
+
+#endif // !__FENNIX_KERNEL_FILESYSTEM_USTAR_H__