136 lines
3.8 KiB
C
136 lines
3.8 KiB
C
/*
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* fat.h
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*
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* Created on: Aug 31, 2011
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* Author: Tiberiu
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*/
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#ifndef FAT_H_
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#define FAT_H_
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#include <fileio.h>
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/*******************************************************
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* FAT: Bios Parameter Block *
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*******************************************************/
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typedef struct {
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uint8 AsmJmp[3];
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char OemId[8];
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uint16 BytesPerSector;
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uint8 SectorsPerCluster;
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uint16 ReservedSectors;
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uint8 FatsCount;
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uint16 DirectoryEntriesCount;
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uint16 TotalSectors;
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uint8 MediaDescriptorType;
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uint32 SectorsPerFat;
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uint16 SectorsPerTrack;
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uint16 Heads;
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uint32 HiddenSectors;
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uint32 TotalSectorsLarge;
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} __attribute__((packed)) FatBiosParameterBlock ;
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/*******************************************************
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* FAT12/FAT16: Extended boot record *
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*******************************************************/
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typedef struct {
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uint8 DriveNumber; // Useless
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uint8 NtFlags;
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uint8 Signature; // Must be 0x28/0x29
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uint32 VolumeIdSerial;
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char VolumeLabel[11];
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char SystemId[8];
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} __attribute__((packed)) Fat16ExtendedBootRecord; // fat12 or 16
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/*******************************************************
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* FAT32: Extended boot record *
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*******************************************************/
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typedef struct {
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uint32 SectorsPerFat;
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uint16 Flags;
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uint16 FatVersion; // High byte=major version, low=minor
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uint32 RootDirectoryCluster;
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uint16 FsInfoCluster;
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uint16 BackupBootSectorCluster;
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uint8 Reserved[12]; // Should be set to 0 when formatting
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uint8 DriveNumber;
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uint8 NtFlags;
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uint8 Signature; // Must be 0x28/0x29
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uint32 VolumeIdSerial;
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char VolumeLabel[11];
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char SystemId[8]; // Always "FAT32 "
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} __attribute__((packed)) Fat32ExtendedBootRecord;
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/*******************************************************
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* FAT: Extended boot record (union of above 2 fields) *
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*******************************************************/
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union FatExtendedBootRecord
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{
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Fat16ExtendedBootRecord fat16;
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Fat32ExtendedBootRecord fat32;
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};
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/*******************************************************
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* FAT: Complete boot sector info *
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*******************************************************/
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typedef struct {
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FatBiosParameterBlock bpb;
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union FatExtendedBootRecord ext;
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} __attribute__((packed)) FatBootSector;
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/*******************************************************
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* FAT: Directory entry *
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*******************************************************/
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typedef struct {
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char FileName[8];
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char FileExt[3];
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uint8 Attributes;
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uint8 _reserved;
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uint8 CreateTimeFine; // hundreds (0.01) of a second, up to 199
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uint16 CreateTime; // 15-11 hour; 10-5 mins; 4-0 secs/2;
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uint16 CreateDate; // 15-9 year (since 1980); 8-5 mon; 4-0 day
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uint16 AccessDate;
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uint16 FirstClusterHigh; // Fat32; EA-index in fat12,fat16
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uint16 LastModifiedTime;
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uint16 LastModifiedDate;
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uint16 FirstClusterLow;
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uint32 Size;
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} __attribute__((packed)) FatDirectoryEntry;
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/*******************************************************
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* FAT: Long file name entry *
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*******************************************************/
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typedef struct {
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uint8 SequenceNo;
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uint16 Name1[5]; // Encoded in UTF-16
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uint8 Attributes; // Should be 0xF;
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uint8 _reserved;
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uint16 Name2[6];
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uint16 FirstCluster;// Should be 0x0000
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uint16 Name3[2];
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} FatLongFileName;
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/*******************************************************
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* FAT: Directory entry (union of above 2 fields) *
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*******************************************************/
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union FatDirEntryUnion {
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FatDirectoryEntry d;
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FatLongFileName lfn;
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};
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extern uint32 FatDetect (void* buffer);
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extern void FatInstall();
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extern uint32 Fat12Detect (DevReadRoutine r, uint32 blocksz);
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extern uint32 Fat16Detect (DevReadRoutine r, uint32 blocksz);
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extern uint32 Fat32Detect (DevReadRoutine r, uint32 blocksz);
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#endif /* FAT_H_ */
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