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Adding subdir functionality

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Added FAT16 driver ability to list subdir entries
Removed structure of FAT32 (we won't be using it anytime soon)
This commit is contained in:
Nigel Barink
2023-02-24 21:31:20 +01:00
parent a77621faf5
commit 644ff5b1f5
3 changed files with 84 additions and 54 deletions
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41
kernel/storage/filesystems/FAT/FAT.h
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@ -18,25 +18,6 @@ struct ExtendedBootRecord_FAT16{
uint8_t SecRmndr[512];
}__attribute__((packed));
struct ExtendedBootRecord_FAT32{
uint32_t SectorsPerFAT;
uint16_t Flags;
const uint16_t FAT_VERSION_NUMBER;
uint32_t rootDirectory_clusterNumber;// Often set to 2;
uint16_t FSInfo_SectorNumber;
uint16_t backup_bpb_sectorNumber;
uint8_t Reserved [12];
uint8_t DriveNumber;
uint8_t Reserved2;
uint8_t Signature; // must be 0x28 or 0x29
uint32_t VOLUME_ID_SERIAL;
uint8_t volume_label[11];
uint8_t SystemIdentifierString [8]; // ALWAYS "FAT32 " but spec says do not trust
uint8_t BootCode [420]; // NICE
uint16_t PartitionSignature; // 0xAA55
}__attribute__((packed));
struct BiosParameterBlock {
uint8_t jmpBoot[3];
uint8_t OEMName [8];
@ -66,25 +47,10 @@ struct DIR {
uint16_t FstClusHi; // High Word of first data cluster for file/directory described
uint16_t WrtTime; // Last Modification time | Must equal CrtTime
uint16_t WrtDate; // Last Modification date | Must equal CrtDate
uint16_t FstClusLO; // Low word of first data cluster for file/directory described
uint16_t FstClusLo; // Low word of first data cluster for file/directory described
uint32_t FileSize; // size in bytes of file/directory described
}__attribute__((packed));
typedef struct _DIRECTORY{
uint8_t Filename[8];
uint8_t Ext[3];
uint8_t Attrib;
uint8_t Reserved;
uint8_t TimeCreatedMs;
uint16_t TimeCreated;
uint16_t DateCreated;
uint16_t DateLastAccessed;
uint16_t FirstClusterHiBytes;
uint16_t LastModTime;
uint16_t LastModDate;
uint16_t FirstCluster;
uint32_t FileSize;
}__attribute__((packed)) DIRECTORY, *PDIRECTORY;
enum struct FAT_TYPE{
FAT12,
@ -115,7 +81,10 @@ public:
static uint16_t GetFATEntry(BiosParameterBlock*, unsigned int);
static uint16_t DetermineFreeSpace();
static int GetSectorOfRootDirectory(BiosParameterBlock*);
static int RootDirSize(BiosParameterBlock*);
static unsigned int RootDirSize(BiosParameterBlock*);
static void OpenSubdir (DIR*, BiosParameterBlock*);
static const int FREE = 0x0000;
static const int ALLOCATED = 0x0002;