/*****************************************************************************\*              efs - General purpose Embedded Filesystem library              **          --------------------- -----------------------------------          **                                                                             ** Filename : fs.h                                                             ** Description : Headerfile for fs.c                                           **                                                                             ** This program 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; version 2                     ** of the License.                                                             *                                                                              ** This program 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.                                **                                                                             ** As a special exception, if other files instantiate templates or             ** use macros or inline functions from this file, or you compile this          ** file and link it with other works to produce a work based on this file,     ** this file does not by itself cause the resulting work to be covered         ** by the GNU General Public License. However the source code for this         ** file must still be made available in accordance with section (3) of         ** the GNU General Public License.                                             **                                                                             ** This exception does not invalidate any other reasons why a work based       ** on this file might be covered by the GNU General Public License.            **                                                                             **                                                    (c)2006 Lennart Yseboodt **                                                    (c)2006 Michael De Nil   *\*****************************************************************************/#ifndef __FS_H_#define __FS_H_/*****************************************************************************/#include "config.h"#include "error.h"#include "partition.h"#include "types.h"#include "debug.h"#include "time.h"/*****************************************************************************/#define FAT12 1#define FAT16 2#define FAT32 3#define FS_INFO_SECTOR 1#define FSINFO_MAGIC_BEGIN 0x41615252#define FSINFO_MAGIC_END   0xAA550000/*****************************************************************************************\              VolumeId               ------  * ushort BytesPerSector		Must be 512 or shit happens.* uchar  SectorsPerCluster	Must be multiple of 2 (1,2,4,8,16 or 32)* ushort ReservedSectorCount	Number of sectors after which the first FAT begins.* uchar	 NumberOfFats		Should be 2* ushort RootEntryCount		Number of filerecords the Rootdir can contain. NOT for FAT32* ushort SectorCount16		Number of Sectors for 12/16 bit FAT * ushort FatSectorCount16	Number of Sectors for 1 FAT on FAT12/16 bit FAT's* ulong  SectorCount32		Number of Sectors for 32 bit FAT* ulong FatSectorCount32	Number of Sectors for 1 FAT on FAT32 * ulong RootCluster			Clusternumber of the first cluster of the RootDir on FAT 32This is NOT a complete volumeId copy, no direct I/O is possible.\*****************************************************************************************/struct VolumeId{	euint16 BytesPerSector;	euint8 SectorsPerCluster;	euint16 ReservedSectorCount;	euint8 NumberOfFats;	euint16 RootEntryCount;	euint16 SectorCount16;	euint16 FatSectorCount16;	euint32 SectorCount32;	euint32 FatSectorCount32;	euint32 RootCluster;};typedef struct VolumeId VolumeId;/**************************************************************************************************\              FileSystem               --------* Partition* 	part		Pointer to partition on which this FS resides.* VolumeId		volumeId	Contains important FS info.* ulong			DataClusterCount	Number of dataclusters. This number determines the FATType.* ulong			FatSectorCount		Number of sectors for 1 FAT, regardless of FATType* ulong			SectorCount			Number of sectors, regardless of FATType* ulong 		FirstSectorRootDir	First sector of the RootDir. * uchar			type				Determines FATType (FAT12 FAT16 or FAT32 are defined)\**************************************************************************************************/struct FileSystem{	Partition *part;	VolumeId volumeId;	euint32 DataClusterCount;	euint32 FatSectorCount;	euint32 SectorCount;	euint32 FirstSectorRootDir;	euint32 FirstClusterCurrentDir;	euint32 FreeClusterCount;	euint32 NextFreeCluster;	euint8 type;};typedef struct FileSystem FileSystem;/**************************************************************************************************\              FileLocation               ----------* euint32		Sector				Sector where the directoryentry of the file/directory can be found.* euint8		Offset				Offset (in 32byte segments) where in the sector the entry is.\**************************************************************************************************/struct FileLocation{	euint32 Sector;	euint8 Offset;	euint8 attrib;};typedef struct FileLocation FileLocation;/*****************************************************************************\*                               FileCache                                    *                              -----------                                   * This struct acts as cache for the current file. It contains the current    * FATPointer (next location in the FAT table), LogicCluster                  * (the last part of the file that was read) and DataCluster                  * (the last cluster that was read).     * euint8		Linear				For how many more clusters the file is nonfragmented* euint32		LogicCluster		This field determines the n'th cluster of the file as current* euint32		DiscCluster		If this field is 0, it means the cache is invalid. Otherwise									it is the clusternumber corresponding with 									logic(FirstCluster+LogicCluster).* euint32		FirstCluster		First cluster of the chain. Zero or one are invalid.* euint32		LastCluster		Last cluster of the chain (is not always filled in)\*****************************************************************************/struct ClusterChain{	euint8 Linear;	esint32 LogicCluster;	euint32 DiscCluster;	euint32 FirstCluster;	euint32 LastCluster;	euint32 ClusterCount;};typedef struct ClusterChain ClusterChain;/*****************************************************************************\*                               FileRecord                                    **                              ------------                                   ** This struct represents a 32 byte file entry as it occurs in the data area   ** of the filesystem. Direct I/O is possible.                                  *\*****************************************************************************/struct FileRecord{	euint8 FileName[11];	euint8 Attribute;	euint8 NTReserved;	euint8 MilliSecTimeStamp;	euint16 CreatedTime;	euint16 CreatedDate;	euint16 AccessDate;	euint16 FirstClusterHigh;	euint16 WriteTime;	euint16 WriteDate;	euint16 FirstClusterLow;	euint32 FileSize;};typedef struct FileRecord FileRecord;eint16 fs_initFs(FileSystem *fs,Partition *part);eint16 fs_isValidFat(Partition *part);void fs_loadVolumeId(FileSystem *fs, Partition *part);esint16 fs_verifySanity(FileSystem *fs);void fs_countDataSectors(FileSystem *fs);void fs_determineFatType(FileSystem *fs);void fs_findFirstSectorRootDir(FileSystem *fs);void fs_initCurrentDir(FileSystem *fs);euint32 fs_getSectorAddressRootDir(FileSystem *fs,euint32 secref);euint32 fs_clusterToSector(FileSystem *fs,euint32 cluster);euint32 fs_sectorToCluster(FileSystem *fs,euint32 sector);euint32 fs_getNextFreeCluster(FileSystem *fs,euint32 startingcluster);euint32 fs_giveFreeClusterHint(FileSystem *fs);esint16 fs_findFreeFile(FileSystem *fs,eint8* filename,FileLocation *loc,euint8 mode);esint8 fs_findFile(FileSystem *fs,eint8* filename,FileLocation *loc,euint32 *lastDir);esint8 fs_findFile_broken(FileSystem *fs,eint8* filename,FileLocation *loc);euint32 fs_getLastCluster(FileSystem *fs,ClusterChain *Cache);euint32 fs_getFirstClusterRootDir(FileSystem *fs);euint16 fs_makeDate(void);euint16 fs_makeTime(void);void fs_setFirstClusterInDirEntry(FileRecord *rec,euint32 cluster_addr);void fs_initClusterChain(FileSystem *fs,ClusterChain *cache,euint32 cluster_addr);esint8 fs_flushFs(FileSystem *fs);esint8 fs_umount(FileSystem *fs);esint8 fs_clearCluster(FileSystem *fs,euint32 cluster);esint8 fs_getFsInfo(FileSystem *fs,euint8 force_update);esint8 fs_setFsInfo(FileSystem *fs);#endif