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Allow finding files in the root directory

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This allows you to find the cluster number of a file in the root
directory by name. The main program is a simple demo where you can type
in a filename and it will tell you the cluster number.
This commit is contained in:
Byron Lathi
2022-04-17 18:12:13 -05:00
parent edd13e9b71
commit 52f631e558
3 changed files with 193 additions and 28 deletions
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15
sw/kernel/filesystem/fat.h
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@@ -5,6 +5,15 @@
extern uint8_t fat_buf[];
#define FAT_MAX_FILE_NAME 255
#define FAT_CLUSTERS_PER_SECTOR 128
#define FAT_CLUSTERMASK 0x0fffffff
#define FAT_EOC_CLUSTERMASK 0x0ffffff8
#define FAT_LAST_LFN_MASK (1 << 6)
#define FAT_LFN_ENTRY_MASK 0x1f
typedef struct {
uint16_t bytes_per_sector;
uint8_t sectors_per_cluster;
@@ -87,7 +96,7 @@ typedef struct {
uint8_t checksum;
uint16_t filename1[6];
uint16_t reserved;
uint16_t filename[2];
uint16_t filename2[2];
} vfat_dentry_t;
typedef struct {
@@ -104,8 +113,10 @@ typedef struct {
uint32_t file_size;
} dos_dentry_t;
void fat_print_pbp_info(ebpb_t* epbp);
void fat_print_pbp_info(full_bpb_t* bpb);
void fat_init();
void fat_read(char* filename, void* buf);
uint16_t fat_parse_path_to_cluster(char* filename);
#endif