136 lines
4.6 KiB
C
136 lines
4.6 KiB
C
// vfat.h
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// Author: Josh Holtrop
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// Date: 03/11/04
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// Modified: 03/22/04
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#ifndef __HOS_VFAT__
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#define __HOS_VFAT__ __HOS_VFAT__
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#include "hos_defines.h"
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#include "fs/vfs.h"
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#define VFAT_FAT12_EOCL 0x0FF8 // end-of-cluster chain reached if FatValue >= EOCL
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#define VFAT_FAT16_EOCL 0xFFF8
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#define VFAT_FAT32_EOCL 0x0FFFFFF8
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#define VFAT_FAT12_EOC 0x0FFF // end-of-cluster chain value
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#define VFAT_FAT16_EOC 0xFFFF
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#define VFAT_FAT32_EOC 0x0FFFFFFF
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#define VFAT_FAT12_BAD 0x0FF7 // bad cluster mark
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#define VFAT_FAT16_BAD 0xFFF7
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#define VFAT_FAT32_BAD 0x0FFFFFF7
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#define VFAT_DIRENTRY_FREE 0xE5
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#define VFAT_DIRENTRY_FREE_LAST 0x00
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typedef struct
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{
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byte jmpBoot[3]; // {0xEB, 0x??, 0x90} or {0xE9, 0x??, 0x??}
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char OEMName[8]; // any 8-char string (def. "MSWIN4.1")
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word bytesPerSector; // 512 (default), 1024, 2048, 4096
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byte sectorsPerCluster; // 1 (default), 2, 4, 8, 16, 32, 64, 128
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word reservedSectors; // 1 (fat12/16), 32 (fat32)
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byte numFATs; // 2
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word rootEntries; // number of 32-byte root directory entries (224 for 1440k floppy) - 0 for fat32
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word totalSectors16; // total number of sectors in volume (2880 for floppy) - 0 for fat32
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byte media; // >= 0xF0 valid, 0xF8 (default non-removable), 0xF0 (default removable), must match lsb of FAT[0]
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word sectorsPerFAT16; // number of sectors in FAT (9 for floppy)
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word sectorsPerTrack; // (18 for floppy)
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word numHeads; // number of heads (2 for floppy)
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dword hiddenSectors; // 0
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dword totalSectors32; // 0, non-zero for fat32 volumes
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/* FAT32 specific members */
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dword sectorsPerFAT32; // number of sectors in a fat for fat32 volumes
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word extFlags; // bits 0-3 active fat, bit 7 {0 = mirror all FATs, 1 = only use 1 FAT}
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word fsVersion; // fat32 version (0:0)
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dword rootCluster; // first cluster of root directory (default 2)
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word fsInfo; // sector number of FSINFO block (default 1)
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word bootCopy; // sector of backup boot record (default 6)
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} __attribute__ ((packed)) vfat_bpb;
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typedef struct
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{
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dword leadSignature; // 0x41615252
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byte reserved1[480];
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dword structSignature; // 0x61417272
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dword lastFree; // last known free cluster (0xFFFFFFFF == unknown)
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dword nextFree; // start looking for free clusters here (0xFFFFFFFF == unknown)
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byte reserved2[12];
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dword trailSignature; // 0xAA550000
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} __attribute__ ((packed)) vfat_fsinfo;
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typedef struct
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{
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char fileName[8]; // file name, 8 char. max, pad w/ spaces
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char fileExt[3]; // file extension, 3 char. max, pad w/ spaces
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byte attributes; // file attributes, read-only, etc.
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byte reserved; // 0
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byte timeTenths; // 0-199
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word time; // time of creation
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word date; // date of creation
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word adate; // last accessed date
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word clusterHigh; // 0 for fat12/16
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word wtime; // last write time
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word wdate; // last write date
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word clusterLow; // LSW of first cluster of file data
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dword fileSize;
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} __attribute__ ((packed)) vfat_dirEntry;
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typedef struct
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{
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byte order;
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word name0_4[5]; // filename - first 5 characters (unicode)
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byte attributes; // must be VFAT_LONG_NAME
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byte type; // 0 = part of long name
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byte checksum; // checksum of short entry at end of long entry set
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word name5_10[6]; // filename - next 6 characters (unicode)
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word clusterLow; // 0
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word name11_12[2]; // filename - next 2 characters
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} __attribute__ ((packed)) vfat_lfnEntry;
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#define VFAT_READ_ONLY 0x01
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#define VFAT_HIDDEN 0x02
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#define VFAT_SYSTEM 0x04
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#define VFAT_VOLUME 0x08
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#define VFAT_DIRECTORY 0x10
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#define VFAT_ARCHIVE 0x20
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#define VFAT_LONG_NAME 0x0F // VFAT_READ_ONLY | VFAT_HIDDEN | VFAT_SYSTEM | VFAT_VOLUME
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#define VFAT_ATTR_MASK 0x3F // VFAT_READ_ONLY | VFAT_HIDDEN | VFAT_SYSTEM | VFAT_VOLUME | VFAT_DIRECTORY | VFAT_ARCHIVE
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#define VFAT_ORDER_MASK 0x40
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/*
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* Illegal file name characters:
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* Values less than 0x20 except for 0x05. 0x05 signifies that the actual filename character is 0xE5
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* 0x22 ("), 0x2A (*)
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* 0x2E (.), 0x2F (/), 0x3A (:)
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* 0x3C (<), 0x3E (>), 0x3F (?), 0x5C (\), 0x7C (|)
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* The following are illegal in 8.3 but legal in LFN:
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* 0x2B (+), 0x2C (,), 0x3B (;), 0x3D (=), 0x5B ([), 0x5D (])
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*/
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//From Microsoft's FAT32 File System Specification
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typedef struct
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{
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dword diskSize;
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byte sectorsPerCluster;
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} DSKSZTOSECPERCLUS;
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// sector[510] == 0x55
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// sector[511] == 0xAA
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int vfat_identify(vfat_bpb *bpb);
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int vfat_format(Volume *vol);
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FILE *vfat_open(char *fileName, dword attributes, Volume *vol);
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vfat_bpb *vfat_getBootSector(Volume *vol);
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int vfat_close(FILE *fp);
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byte *vfat_loadFAT(Volume *vol, vfat_bpb *bpb)
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vfat_getEntryInRoot(vol, bpb, fileName, 0);
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#endif
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