Nigel/BarinkOS
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We can now open and read files on the harddisk through a messy virtual filesystem

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The uri has to contain 8.3 filenames for now as I have not yet figured out
how to convert from that to regular filenaming for the name comparison.

reading files is still limited to 1 sector
This commit is contained in:
Nigel Barink
2023-02-26 13:44:41 +01:00
parent 61f1852420
commit e6901f0526
12 changed files with 310 additions and 385 deletions
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44
kernel/storage/filesystems/FAT/FAT.h
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@ -63,32 +63,18 @@ enum struct FAT_TYPE{
class FAT {
public:
// Wanted API for vfs
static file Open(char* filename);
static int close(file* file);
static int Read(file* file, void* buffer , int length);
static int Write(file* file, const void* buffer, int length);
static int create(inode* dir_node, inode** target, const char* component_name);
static int lookup(inode* , inode**, const char*);
static int compare(directoryEntry* , char* , char*);
static superblock* Mount(filesystem* fs, const char* name ,vfsmount* mount);
static FILE Open(char* filename);
static int close(FILE* file);
static int Read(FILE* file, void* buffer , unsigned int length);
static int Write(FILE* file, const void* buffer, unsigned int length);
static int Create(inode* dir_node, inode** target, const char* component_name);
static DirectoryNode* Lookup(inode* , DirectoryNode*);
static int Compare(DirectoryNode* , char *filename, char *filename2);
static FS_SUPER* Mount(filesystem* fs, const char* name , vfsmount* mount);
// TEMP
static void listFilesInRoot(MBR* mbr, BiosParameterBlock* bpb );
static BiosParameterBlock* getBPB( bool DEBUG =false );
static FAT_TYPE determineFATType(BiosParameterBlock* bpb);
static uint16_t GetFATEntry(BiosParameterBlock*, unsigned int);
static uint16_t DetermineFreeSpace();
static int GetSectorOfRootDirectory(BiosParameterBlock*);
static unsigned int RootDirSize(BiosParameterBlock*);
static void OpenSubdir (DIR*, BiosParameterBlock*);
static void readFile(DIR*, BiosParameterBlock*);
static const int FREE = 0x0000;
static const int ALLOCATED = 0x0002;
static const int FREE = 0x0000;
static const int ALLOCATED = 0x0002;
static const int BAD = 0xFFF7;
static const int EOF = 0xFFFF;
@ -98,6 +84,9 @@ public:
static const char DOS_TRAILING_SPACE = 0x20;
static const char FREE_DIR = 0xE5; // If KANJI charset 0x05
static const char FREE_DIR_2 = 0x00; // All directories after this are free including this one
static void ListRootDirectoryContents(BiosParameterBlock* bpb );
static BiosParameterBlock* GetBiosParameterBlock(bool DEBUG =false );
enum ATTRIBUTES {
ATTR_READ_ONLY = 0x01,
@ -111,6 +100,13 @@ public:
private:
static FAT_TYPE DetermineFATType(BiosParameterBlock* bpb);
static uint16_t GetFATEntry(BiosParameterBlock*, unsigned int);
static uint16_t DetermineFreeSpace();
static int GetSectorOfRootDirectory(BiosParameterBlock*);
static unsigned int RootDirSize(BiosParameterBlock*);
static void OpenSubdir (DIR*, BiosParameterBlock*);
static void ReadFileContents(DIR *fileEntry, BiosParameterBlock *bpb);
enum ENTRY_SIZE {
FAT12 = 12,