/*
 * fileio.h
 *
 *  Created on: Aug 23, 2011
 *      Author: Tiberiu
 */

#ifndef FILEIO_H_
#define FILEIO_H_

#include <types.h>

enum FsFlags
{
	FsFile			= 0x1,
	FsDirectory		= 0x2,
	FsCharDevice	= 0x3,
	FsBlockDevice	= 0x4,
	FsPipe			= 0x5,
	FsSymbolLink	= 0x6,
	FsMountPoint	= 0x8
};

typedef uint32 (*ReadRoutine)(struct _FsNode*, uint32, uint32, uint8*);
typedef uint32 (*WriteRoutine)(struct _FsNode*, uint32, uint32, uint8*);
typedef void (*OpenRoutine)(struct _FsNode*);
typedef void (*CloseRoutine)(struct _FsNode*);
typedef struct _DirectoryEntry (*ReadDirRoutine)(struct _FsNode*,uint32);
typedef struct _FsNode* (*FindDirRoutine)(struct _FsNode*,char *name);

typedef struct _FsNode
{
   char Name[128];			// The filename.
   uint32 Permissions;		// The permissions mask.
   uint32 UserId;			// The owning user.
   uint32 GroupId;			// The owning group.
   uint32 Flags;			// Includes the node type. See enum above.
   uint32 INode;			// This is device-specific - provides a way for a filesystem to identify files.
   uint32 Length;			// Size of the file, in bytes.
   uint32 Implementation;	// An implementation-defined number.
   ReadRoutine Read;
   WriteRoutine Write;
   OpenRoutine Open;
   CloseRoutine Close;
   ReadDirRoutine ReadDir;
   FindDirRoutine FindDir;
   struct _FsNode *Ptr; 			// Used by mountpoints and symlinks.
} FsNode;


typedef struct _DirectoryEntry
{
	char Name[128];
	uint32 INode;
} DirectoryEntry;


extern uint32 FsRead(FsNode *node, uint32 offset, uint32 size, uint8 *buffer);
extern uint32 FsWrite(FsNode *node, uint32 offset, uint32 size, uint8 *buffer);
extern void FsOpen(FsNode *node, uint8 read, uint8 write);
extern void FsClose(FsNode *node);
extern DirectoryEntry *FsReadDir(FsNode *node, uint32 index);
extern FsNode *FsFindDir(FsNode *node, char *name);

#ifdef NEVER
void VfsRegisterFilesys();
void VfsMount();
#endif

#endif /* FILEIO_H_ */