mirror of https://github.com/ventoy/Ventoy.git
129 lines
4.9 KiB
C
129 lines
4.9 KiB
C
#ifndef __FAT_DEFS_H__
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#define __FAT_DEFS_H__
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#include "fat_opts.h"
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#include "fat_types.h"
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//-----------------------------------------------------------------------------
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// FAT32 Offsets
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// Name Offset
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//-----------------------------------------------------------------------------
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// Boot Sector
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#define BS_JMPBOOT 0 // Length = 3
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#define BS_OEMNAME 3 // Length = 8
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#define BPB_BYTSPERSEC 11 // Length = 2
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#define BPB_SECPERCLUS 13 // Length = 1
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#define BPB_RSVDSECCNT 14 // Length = 2
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#define BPB_NUMFATS 16 // Length = 1
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#define BPB_ROOTENTCNT 17 // Length = 2
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#define BPB_TOTSEC16 19 // Length = 2
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#define BPB_MEDIA 21 // Length = 1
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#define BPB_FATSZ16 22 // Length = 2
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#define BPB_SECPERTRK 24 // Length = 2
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#define BPB_NUMHEADS 26 // Length = 2
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#define BPB_HIDDSEC 28 // Length = 4
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#define BPB_TOTSEC32 32 // Length = 4
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// FAT 12/16
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#define BS_FAT_DRVNUM 36 // Length = 1
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#define BS_FAT_BOOTSIG 38 // Length = 1
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#define BS_FAT_VOLID 39 // Length = 4
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#define BS_FAT_VOLLAB 43 // Length = 11
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#define BS_FAT_FILSYSTYPE 54 // Length = 8
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// FAT 32
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#define BPB_FAT32_FATSZ32 36 // Length = 4
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#define BPB_FAT32_EXTFLAGS 40 // Length = 2
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#define BPB_FAT32_FSVER 42 // Length = 2
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#define BPB_FAT32_ROOTCLUS 44 // Length = 4
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#define BPB_FAT32_FSINFO 48 // Length = 2
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#define BPB_FAT32_BKBOOTSEC 50 // Length = 2
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#define BS_FAT32_DRVNUM 64 // Length = 1
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#define BS_FAT32_BOOTSIG 66 // Length = 1
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#define BS_FAT32_VOLID 67 // Length = 4
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#define BS_FAT32_VOLLAB 71 // Length = 11
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#define BS_FAT32_FILSYSTYPE 82 // Length = 8
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//-----------------------------------------------------------------------------
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// FAT Types
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//-----------------------------------------------------------------------------
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#define FAT_TYPE_FAT12 1
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#define FAT_TYPE_FAT16 2
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#define FAT_TYPE_FAT32 3
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//-----------------------------------------------------------------------------
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// FAT32 Specific Statics
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//-----------------------------------------------------------------------------
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#define SIGNATURE_POSITION 510
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#define SIGNATURE_VALUE 0xAA55
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#define PARTITION1_TYPECODE_LOCATION 450
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#define FAT32_TYPECODE1 0x0B
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#define FAT32_TYPECODE2 0x0C
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#define PARTITION1_LBA_BEGIN_LOCATION 454
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#define PARTITION1_SIZE_LOCATION 458
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#define FAT_DIR_ENTRY_SIZE 32
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#define FAT_SFN_SIZE_FULL 11
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#define FAT_SFN_SIZE_PARTIAL 8
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//-----------------------------------------------------------------------------
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// FAT32 File Attributes and Types
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//-----------------------------------------------------------------------------
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#define FILE_ATTR_READ_ONLY 0x01
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#define FILE_ATTR_HIDDEN 0x02
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#define FILE_ATTR_SYSTEM 0x04
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#define FILE_ATTR_SYSHID 0x06
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#define FILE_ATTR_VOLUME_ID 0x08
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#define FILE_ATTR_DIRECTORY 0x10
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#define FILE_ATTR_ARCHIVE 0x20
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#define FILE_ATTR_LFN_TEXT 0x0F
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#define FILE_HEADER_BLANK 0x00
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#define FILE_HEADER_DELETED 0xE5
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#define FILE_TYPE_DIR 0x10
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#define FILE_TYPE_FILE 0x20
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//-----------------------------------------------------------------------------
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// Time / Date details
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//-----------------------------------------------------------------------------
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#define FAT_TIME_HOURS_SHIFT 11
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#define FAT_TIME_HOURS_MASK 0x1F
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#define FAT_TIME_MINUTES_SHIFT 5
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#define FAT_TIME_MINUTES_MASK 0x3F
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#define FAT_TIME_SECONDS_SHIFT 0
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#define FAT_TIME_SECONDS_MASK 0x1F
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#define FAT_TIME_SECONDS_SCALE 2
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#define FAT_DATE_YEAR_SHIFT 9
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#define FAT_DATE_YEAR_MASK 0x7F
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#define FAT_DATE_MONTH_SHIFT 5
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#define FAT_DATE_MONTH_MASK 0xF
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#define FAT_DATE_DAY_SHIFT 0
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#define FAT_DATE_DAY_MASK 0x1F
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#define FAT_DATE_YEAR_OFFSET 1980
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//-----------------------------------------------------------------------------
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// Other Defines
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//-----------------------------------------------------------------------------
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#define FAT32_LAST_CLUSTER 0xFFFFFFFF
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#define FAT32_INVALID_CLUSTER 0xFFFFFFFF
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STRUCT_PACK_BEGIN
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struct fat_dir_entry STRUCT_PACK
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{
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uint8 Name[11];
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uint8 Attr;
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uint8 NTRes;
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uint8 CrtTimeTenth;
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uint8 CrtTime[2];
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uint8 CrtDate[2];
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uint8 LstAccDate[2];
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uint16 FstClusHI;
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uint8 WrtTime[2];
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uint8 WrtDate[2];
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uint16 FstClusLO;
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uint32 FileSize;
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} STRUCT_PACKED;
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STRUCT_PACK_END
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#endif
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