fat_driver.h

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#ifndef _FAT_DRIVER_H
#define _FAT_DRIVER_H 1
 
#if !defined(BUILDING_IEEE1394_DISK) && !defined(BUILDING_USBHDFSD)
#include "scache.h"
#include <bdm.h>
#endif
 
#define DIR_CHAIN_SIZE 32
 
#define FAT_MAX_NAME 256
 
// attributes (bits:5-Archive 4-Directory 3-Volume Label 2-System 1-Hidden 0-Read Only)
#define FAT_ATTR_READONLY     0x01
#define FAT_ATTR_HIDDEN       0x02
#define FAT_ATTR_SYSTEM       0x04
#define FAT_ATTR_VOLUME_LABEL 0x08
#define FAT_ATTR_DIRECTORY    0x10
#define FAT_ATTR_ARCHIVE      0x20
 
#ifndef BUILDING_USBHDFSD
typedef struct _fat_bpb
{
    unsigned int sectorSize;     // bytes per sector - should be 512
    unsigned char clusterSize;   // sectors per cluster - power of two
    unsigned int resSectors;     // reserved sectors - typically 1 (boot sector)
    unsigned char fatCount;      // number of FATs - must be 2
    unsigned int rootSize;       // number of rootdirectory entries - typically 512
    unsigned int fatSize;        // sectors per FAT - varies
    unsigned int trackSize;      // sectors per track
    unsigned int headCount;      // number of heads
    unsigned int sectorCount;    // number of sectors
    unsigned int partStart;      // sector where partition starts (boot sector)
    unsigned int rootDirStart;   // sector where root directory starts
    unsigned int rootDirCluster; // fat32 - cluster of the root directory
    unsigned int activeFat;      // fat32 - current active fat number
    unsigned char fatType;       // 12-FAT16, 16-FAT16, 32-FAT32
    unsigned char fatId[9];      // File system ID. "FAT12", "FAT16" or "FAT  " - for debug only
    unsigned int dataStart;      // sector where data starts
} fat_bpb;
 
typedef struct _fat_driver
{
#if !defined(BUILDING_IEEE1394_DISK) && !defined(BUILDING_USBHDFSD)
    struct block_device *bd;
    cache_set *cache;
#else
    struct SBP2Device *dev;
#endif
    fat_bpb partBpb; // partition bios parameter block
 
    // modified by Hermes
#define MAX_DIR_CLUSTER 512
    unsigned int cbuf[MAX_DIR_CLUSTER]; // cluster index buffer // 2048 by Hermes
 
    unsigned int lastChainCluster;
    int lastChainResult;
 
/* enough for long filename of length 260 characters (20*13) and one short filename */
#define MAX_DE_STACK 21
    unsigned int deSec[MAX_DE_STACK]; // direntry sector
    int deOfs[MAX_DE_STACK];          // direntry offset
    int deIdx;                        // direntry index
 
#define SEQ_MASK_SIZE 2048               // Allow 2K files per directory
    u8 seq_mask[SEQ_MASK_SIZE / 8];      // bitmask for consumed seq numbers
#define DIR_MASK_SIZE 2048 * 11          // Allow 2K maxed fullnames per directory
    u8 dir_used_mask[DIR_MASK_SIZE / 8]; // bitmask for used directory entries
 
#define MAX_CLUSTER_STACK 128
    unsigned int clStack[MAX_CLUSTER_STACK]; // cluster allocation stack
    int clStackIndex;
    unsigned int clStackLast; // last free cluster of the fat table
} fat_driver;
#endif /* BUILDING_USBHDFSD */
 
typedef struct _fat_dir_list
{
    unsigned int direntryCluster; // the directory cluster requested by getFirstDirentry
    int direntryIndex;            // index of the directory children
} fat_dir_list;
 
typedef struct _fat_dir_chain_record
{
    unsigned int cluster;
    unsigned int index;
} fat_dir_chain_record;
 
typedef struct _fat_dir
{
    unsigned char attr; // attributes (bits:5-Archive 4-Directory 3-Volume Label 2-System 1-Hidden 0-Read Only)
    char name[FAT_MAX_NAME];
    unsigned char cdate[4];        // D:M:Yl:Yh
    unsigned char ctime[3];        // H:M:S
    unsigned char adate[4];        // D:M:Yl:Yh
    unsigned char atime[3];        // H:M:S
    unsigned char mdate[4];        // D:M:Yl:Yh
    unsigned char mtime[3];        // H:M:S
    unsigned int size;             // file size, 0 for directory
    unsigned int parentDirCluster; // The cluster number of the parent directory.
    unsigned int startCluster;
    // Stuff here are used for caching and might not be filled.
    unsigned int lastCluster;
    fat_dir_chain_record chain[DIR_CHAIN_SIZE]; // cluser/offset cache - for seeking purpose
} fat_dir;
 
#ifdef BUILDING_IEEE1394_DISK
extern int InitFAT(void);
#endif /* BUILDING_IEEE1394_DISK */
extern int strEqual(const char *s1, const char *s2);
 
#ifdef BUILDING_USBHDFSD
extern int fat_mount(mass_dev *dev, unsigned int start, unsigned int count);
extern void fat_forceUnmount(mass_dev *dev);
#endif /* BUILDING_USBHDFSD */
#ifdef BUILDING_IEEE1394_DISK
extern int fat_mount(struct SBP2Device *dev, unsigned int start, unsigned int count);
extern void fat_forceUnmount(struct SBP2Device *dev);
#endif /* BUILDING_IEEE1394_DISK */
#if !defined(BUILDING_IEEE1394_DISK) && !defined(BUILDING_USBHDFSD)
extern int fat_mount(struct block_device *bd);
extern void fat_forceUnmount(struct block_device *bd);
#endif
 
extern void fat_setFatDirChain(fat_driver *fatd, fat_dir *fatDir);
extern int fat_readFile(fat_driver *fatd, fat_dir *fatDir, unsigned int filePos, unsigned char *buffer, unsigned int size);
extern int fat_getFirstDirentry(fat_driver *fatd, const char *dirName, fat_dir_list *fatdlist, fat_dir *fatDir_host, fat_dir *fatDir);
extern int fat_getNextDirentry(fat_driver *fatd, fat_dir_list *fatdlist, fat_dir *fatDir);
 
extern fat_driver *fat_getData(int device);
extern int fat_getFileStartCluster(fat_driver *fatd, const char *fname, unsigned int *startCluster, fat_dir *fatDir);
extern int fat_getClusterChain(fat_driver *fatd, unsigned int cluster, unsigned int *buf, unsigned int bufSize, int startFlag);
#ifndef BUILDING_IEEE1394_DISK
extern int fat_CheckChain(fat_driver *fatd, unsigned int cluster);
#endif /* BUILDING_USBHDFSD */
 
#if !defined(BUILDING_IEEE1394_DISK) && !defined(BUILDING_USBHDFSD)
extern int fat_stopUnit(int device);
extern void fat_stopAll(void);
#endif
 
#endif