modules/usb/usbhdfsd/fat_driver.h

   1 #ifndef _FAT_DRIVER_H
   2 #define _FAT_DRIVER_H 1
   3
   4 #define DIR_CHAIN_SIZE 32
   5
   6 #define FAT_MAX_NAME 128
   7
   8 //attributes (bits:5-Archive 4-Directory 3-Volume Label 2-System 1-Hidden 0-Read Only)
   9 #define FAT_ATTR_READONLY     0x01
  10 #define FAT_ATTR_HIDDEN       0x02
  11 #define FAT_ATTR_SYSTEM       0x04
  12 #define FAT_ATTR_VOLUME_LABEL 0x08
  13 #define FAT_ATTR_DIRECTORY    0x10
  14 #define FAT_ATTR_ARCHIVE      0x20
  15
  16 typedef struct _fat_bpb {
  17         unsigned int  sectorSize;       //bytes per sector - should be 512
  18         unsigned char clusterSize;      //sectors per cluster - power of two
  19         unsigned int  resSectors;       //reserved sectors - typically 1 (boot sector)
  20         unsigned char fatCount;         //number of FATs - must be 2
  21         unsigned int  rootSize;         //number of rootdirectory entries - typically 512
  22         unsigned int  fatSize;          //sectors per FAT - varies
  23         unsigned int  trackSize;        //sectors per track
  24         unsigned int  headCount;        //number of heads
  25         unsigned int  sectorCount;      //number of sectors
  26         unsigned int  partStart;        //sector where partition starts (boot sector)
  27         unsigned int  rootDirStart;     //sector where root directory starts
  28         unsigned int  rootDirCluster;   //fat32 - cluster of the root directory
  29         unsigned int  activeFat;        //fat32 - current active fat number
  30         unsigned char fatType;          //12-FAT16, 16-FAT16, 32-FAT32
  31         unsigned char fatId[9];         //File system ID. "FAT12", "FAT16" or "FAT  " - for debug only
  32         unsigned int  dataStart;        //sector where data starts
  33 } fat_bpb;
  34
  35 typedef struct _fat_driver {
  36         mass_dev* dev;
  37         fat_bpb  partBpb;       //partition bios parameter block
  38
  39         // modified by Hermes
  40 #define MAX_DIR_CLUSTER 512
  41         unsigned int cbuf[MAX_DIR_CLUSTER]; //cluster index buffer // 2048 by Hermes
  42
  43         unsigned int  lastChainCluster;
  44         int lastChainResult;
  45
  46 /* enough for long filename of length 260 characters (20*13) and one short filename */
  47 #define MAX_DE_STACK 21
  48         unsigned int deSec[MAX_DE_STACK]; //direntry sector
  49         int          deOfs[MAX_DE_STACK]; //direntry offset
  50         int          deIdx; //direntry index
  51
  52 #define SEQ_MASK_SIZE 2048         //Allow 2K files per directory
  53         u8 seq_mask[SEQ_MASK_SIZE/8];      //bitmask for consumed seq numbers
  54 #define DIR_MASK_SIZE 2048*11      //Allow 2K maxed fullnames per directory
  55         u8 dir_used_mask[DIR_MASK_SIZE/8]; //bitmask for used directory entries
  56
  57 #define MAX_CLUSTER_STACK 128
  58         unsigned int clStack[MAX_CLUSTER_STACK]; //cluster allocation stack
  59         int clStackIndex;
  60         unsigned int clStackLast; // last free cluster of the fat table
  61 } fat_driver;
  62
  63 typedef struct _fat_dir_list {
  64         unsigned int  direntryCluster; //the directory cluster requested by getFirstDirentry
  65         int direntryIndex; //index of the directory children
  66 } fat_dir_list;
  67
  68 typedef struct _fat_dir_chain_record {
  69         unsigned int cluster;
  70         unsigned int index;
  71 } fat_dir_chain_record;
  72
  73 typedef struct _fat_dir {
  74         unsigned char attr;             //attributes (bits:5-Archive 4-Directory 3-Volume Label 2-System 1-Hidden 0-Read Only)
  75         unsigned char name[FAT_MAX_NAME];
  76         unsigned char cdate[4]; //D:M:Yl:Yh
  77         unsigned char ctime[3]; //H:M:S
  78         unsigned char adate[4]; //D:M:Yl:Yh
  79         unsigned char atime[3]; //H:M:S
  80         unsigned char mdate[4]; //D:M:Yl:Yh
  81         unsigned char mtime[3]; //H:M:S
  82         unsigned int  size;             //file size, 0 for directory
  83         unsigned int  lastCluster;
  84         fat_dir_chain_record  chain[DIR_CHAIN_SIZE];  //cluser/offset cache - for seeking purpose
  85 } fat_dir;
  86
  87 int strEqual(const unsigned char *s1, const unsigned char* s2);
  88
  89 int fat_mount(mass_dev* dev, unsigned int start, unsigned int count);
  90 void fat_forceUnmount(mass_dev* dev);
  91 void fat_setFatDirChain(fat_driver* fatd, fat_dir* fatDir);
  92 int fat_readFile(fat_driver* fatd, fat_dir* fatDir, unsigned int filePos, unsigned char* buffer, unsigned int size);
  93 int fat_getFirstDirentry(fat_driver* fatd, const unsigned char* dirName, fat_dir_list* fatdlist, fat_dir* fatDir);
  94 int fat_getNextDirentry(fat_driver* fatd, fat_dir_list* fatdlist, fat_dir* fatDir);
  95
  96 fat_driver * fat_getData(int device);
  97 int      fat_getFileStartCluster(fat_driver* fatd, const unsigned char* fname, unsigned int* startCluster, fat_dir* fatDir);
  98 int      fat_getClusterChain(fat_driver* fatd, unsigned int cluster, unsigned int* buf, int bufSize, int start);
  99
 100 #endif
 101