A update
This commit is contained in:
220
drivers/fs/duckfs.c
Normal file
220
drivers/fs/duckfs.c
Normal file
@ -0,0 +1,220 @@
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#include <stdbool.h>
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#include <string.h>
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#include <stdlib.h>
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#include <drivers/ide.h>
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#include <fs/duckfs.h>
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static uint16_t duckfs_initialized = 0;
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static duckfs_file_header_t duckfs_root;
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const char* duckfs_versions[18] = { DFS_VERSION_0, DFS_VERSION_1, DFS_VERSION_2, DFS_VERSION_3, DFS_VERSION_4 };
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int32_t duckfs_init(int16_t drive)
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{
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char duckfs_header_block[512];
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if (ide_read48(drive, 0xA, 1, duckfs_header_block) != 0)
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{
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printf("[ DEBUG ] Disk read error on drive #%i\n", drive);
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return -1;
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}
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duckfs_superblock_t* superblock = (duckfs_superblock_t*)duckfs_header_block;
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/*
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if (superblock->duckfs_magic != (int32_t) DFS_MAGIC)
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{
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return -2;
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}
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bool compliant = false;
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for (int16_t i = 0; i < 5; ++i)
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{
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if (strcmp(superblock->duckfs_version_string, duckfs_versions[i]) == 0)
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{
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compliant = true;
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}
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}
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if (compliant == false)
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{
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return -3;
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}*/
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memset(&duckfs_root, 0, sizeof(duckfs_root));
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strncpy(duckfs_root.filename, "/", DFS_MAX_FILENAME_LEN);
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strncpy(duckfs_root.permissions, "RW", sizeof(duckfs_root.permissions));
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duckfs_root.num_sectors = -1;
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duckfs_root.type = DFS_FILE_DIRECTORY;
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duckfs_root.next = NULL;
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duckfs_root.prev = NULL;
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duckfs_root.contents = NULL;
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duckfs_root.lba_start = 0;
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duckfs_root.lba_end = 0;
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duckfs_root.contents = malloc(sizeof(duckfs_file_header_t) * DFS_MAX_FILES);
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if (!duckfs_root.contents) {
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printf("Memory allocation failed for duckfs_root.contents\n");
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return -4;
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}
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for (int32_t i = 0; i < DFS_MAX_FILES; i++) {
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duckfs_root.contents[i].type = DFS_FILE_UNUSED;
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}
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duckfs_initialized = 1;
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return 0;
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}
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void duckfs_format(int16_t drive)
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{
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/* Nothing to do, DuckFS does not require formatting. */
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}
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int32_t duckfs_makedir(const char* filename, const char* perms)
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{
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duckfs_file_header_t* dir = malloc(sizeof(duckfs_file_header_t));
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if (!dir)
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{
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return -1;
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}
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if (strlen(perms) < 3)
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{
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return -2;
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}
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char p[3] = { "." };
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p[0] = perms[0];
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p[1] = perms[1];
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p[2] = perms[2];
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char filen[DFS_MAX_FILENAME_LEN + 1];
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char perma[3];
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strcpy(filen, filename);
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strcpy(perma, perms);
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strncpy(dir->filename, filen, sizeof(dir->filename) - 1);
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dir->filename[sizeof(dir->filename) - 1] = '\0';
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strncpy(dir->permissions, p, sizeof(dir->permissions));
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dir->type = DFS_FILE_DIRECTORY;
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dir->contents = malloc(sizeof(duckfs_file_header_t) * DFS_MAX_FILES);
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if (!dir->contents) {
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free(dir);
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return -1;
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}
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for (int i = 0; i < DFS_MAX_FILES; i++) {
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dir->contents[i].type = DFS_FILE_UNUSED;
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}
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return 0;
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}
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void duckfs_free_directory(duckfs_file_header_t* dir)
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{
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if (!dir || dir->type != DFS_FILE_DIRECTORY || !dir->contents)
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{
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return;
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}
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for (int i = 0; i < DFS_MAX_FILES; i++) {
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duckfs_file_header_t* entry = &dir->contents[i];
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if (entry->type == DFS_FILE_UNUSED)
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{
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continue;
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}
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if (entry->type == DFS_FILE_DIRECTORY) {
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duckfs_free_directory(entry);
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}
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}
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free(dir->contents);
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dir->contents = NULL;
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}
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bool duckfs_add_entry(duckfs_file_header_t* dir, duckfs_file_header_t* entry)
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{
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if (dir->type != DFS_FILE_DIRECTORY || !dir->contents)
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{
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return false;
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}
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for (int i = 0; i < DFS_MAX_FILES; i++) {
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if (dir->contents[i].type == DFS_FILE_UNUSED) {
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dir->contents[i] = *entry;
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return true;
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}
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}
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return false; /* Directory full */
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}
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duckfs_file_header_t duckfs_create_entry(const char* name, const char* perms, const char* type)
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{
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duckfs_file_header_t entry = {0};
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strncpy(entry.filename, name, DFS_MAX_FILENAME_LEN);
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strncpy(entry.permissions, perms, sizeof(entry.permissions) - 1);
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int16_t itype = DFS_FILE_UNUSED;
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if (strcmp(type, "text") == 0)
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{
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itype = DFS_FILE_TEXT;
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}
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else if (strcmp(type, "bin") == 0)
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{
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itype = DFS_FILE_BINARY;
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}
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else if (strcmp(type, "dir") == 0)
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{
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itype = DFS_FILE_BINARY;
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}
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else
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{
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duckfs_file_header_t vvvv = { .type = DFS_FILE_ERROR };
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return vvvv;
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}
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entry.num_sectors = 0;
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entry.type = itype;
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entry.next = NULL;
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entry.prev = NULL;
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entry.contents = NULL;
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entry.lba_start = 0;
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entry.lba_end = 0;
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if (itype == DFS_FILE_DIRECTORY)
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{
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entry.contents = malloc(sizeof(duckfs_file_header_t) * DFS_MAX_FILES);
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if (entry.contents)
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{
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for (int i = 0; i < DFS_MAX_FILES; i++)
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{
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entry.contents[i].type = DFS_FILE_UNUSED;
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}
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}
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}
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return entry;
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}
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duckfs_file_header_t duckfs_makefile(const char* filename, const char* perms, duckfs_file_header_t parent)
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{
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}
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428
drivers/fs/fat32.c
Normal file
428
drivers/fs/fat32.c
Normal file
@ -0,0 +1,428 @@
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#include <string.h>
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#include <stdio.h>
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#include <drivers/ide.h>
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#include <fs/fat32.h>
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struct __attribute__((packed)) fat32_bpb {
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uint8_t jmp[3];
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uint8_t oem[8];
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uint16_t bytes_per_sector;
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uint8_t sectors_per_cluster;
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uint16_t reserved_sector_count;
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uint8_t num_fats;
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uint16_t root_entry_count;
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uint16_t total_sectors_16;
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uint8_t media;
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uint16_t fat_size_16;
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uint16_t sectors_per_track;
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uint16_t num_heads;
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uint32_t hidden_sectors;
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uint32_t total_sectors_32;
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uint32_t fat_size_32;
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uint16_t ext_flags;
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uint16_t fs_version;
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uint32_t root_cluster;
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};
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static int32_t fat32_drive = 0;
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static struct fat32_bpb bpb;
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static uint32_t fat_start_lba;
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static uint32_t cluster_heap_lba;
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static uint32_t current_directory_cluster;
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static uint8_t sector[512];
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int32_t fat32_init(int32_t drive)
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{
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fat32_drive = drive;
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int err = ide_read48(drive, 0, 1, sector);
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if (err != 0) {
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printf("ide_read48 failed on sector 0 (err = %d)\n", err);
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return -1;
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}
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memcpy(&bpb, sector, sizeof(bpb));
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fat_start_lba = bpb.reserved_sector_count;
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cluster_heap_lba = fat_start_lba + bpb.num_fats * bpb.fat_size_32;
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current_directory_cluster = bpb.root_cluster;
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printf("Bytes per sector: %u\n", bpb.bytes_per_sector);
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printf("Sectors per cluster: %u\n", bpb.sectors_per_cluster);
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printf("Reserved sectors: %u\n", bpb.reserved_sector_count);
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printf("Number of FATs: %u\n", bpb.num_fats);
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printf("FAT size (32): %u\n", bpb.fat_size_32);
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printf("Root cluster: %u\n", bpb.root_cluster);
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return 0;
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}
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static uint32_t cluster_to_lba(uint32_t cluster)
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{
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return cluster_heap_lba + (cluster - 2) * bpb.sectors_per_cluster;
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}
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static void format_83_name(const char *input, char out[11]) {
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memset(out, ' ', 11);
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int i = 0, j = 0;
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// Copy name part (up to 8 chars)
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while (input[i] && input[i] != '.' && j < 8) {
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out[j++] = toupper((unsigned char)input[i++]);
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}
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// Skip dot
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if (input[i] == '.') i++;
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// Copy extension (up to 3 chars)
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int k = 8;
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while (input[i] && j < 11) {
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out[k++] = toupper((unsigned char)input[i++]);
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j++;
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}
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}
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static uint32_t find_free_cluster() {
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// Read FAT sectors one by one
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for (uint32_t cluster = 2; cluster < bpb.total_sectors_32; cluster++) {
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uint32_t fat_sector = fat_start_lba + (cluster * 4) / 512;
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uint32_t fat_offset = (cluster * 4) % 512;
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if (ide_read48(fat32_drive, fat_sector, 1, sector) != 0)
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return 0;
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uint32_t entry = *(uint32_t *)(sector + fat_offset) & 0x0FFFFFFF;
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if (entry == 0x00000000) {
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return cluster;
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}
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}
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return 0; // No free cluster found
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}
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int32_t fat32_list_root(void)
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{
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uint32_t lba = cluster_to_lba(current_directory_cluster);
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if (ide_read48(fat32_drive, lba, 1, sector) != 0)
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{
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return -1;
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}
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for (int i = 0; i < 512; i += 32)
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{
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char *entry = (char *)§or[i];
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if ((uint8_t)entry[0] == 0x00)
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{
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break;
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}
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if ((uint8_t)entry[0] == 0xE5)
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{
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continue;
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}
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char name[12];
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memcpy(name, entry, 11);
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name[11] = 0;
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for (int j = 0; j < 11; j++)
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{
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if (name[j] == ' ')
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{
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name[j] = 0;
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}
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}
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uint8_t attr = entry[11];
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if (attr & FAT32_ATTR_DIRECTORY)
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{
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printf("<DIR> %s\n", name);
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}
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else
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{
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printf(" %s\n", name);
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}
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}
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return 0;
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}
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int32_t fat32_read_file(const char *name, uint8_t *buffer, uint32_t max_len)
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{
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uint32_t lba = cluster_to_lba(current_directory_cluster);
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if (ide_read48(fat32_drive, lba, 1, sector) != 0)
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{
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return -1;
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}
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for (int32_t i = 0; i < 512; i += 32)
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{
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char *entry = (char *)§or[i];
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if ((uint8_t)entry[0] == 0x00)
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{
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break;
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}
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if ((uint8_t)entry[0] == 0xE5)
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{
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continue;
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}
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char entry_name[12];
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memcpy(entry_name, entry, 11);
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entry_name[11] = 0;
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for (int32_t j = 0; j < 11; j++)
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{
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if (entry_name[j] == ' ')
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{
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entry_name[j] = 0;
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}
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}
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if (strncmp(entry_name, name, 11) != 0)
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{
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continue;
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}
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uint32_t cluster = (*(uint16_t *)(entry + 26)) | ((*(uint16_t *)(entry + 20)) << 16);
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uint32_t size = *(uint32_t *)(entry + 28);
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uint32_t bytes_read = 0;
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while (cluster < 0x0FFFFFF8 && bytes_read < max_len && bytes_read < size)
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{
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uint32_t lba = cluster_to_lba(cluster);
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if (ide_read48(fat32_drive, lba, bpb.sectors_per_cluster, buffer + bytes_read) != 0)
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{
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return -1;
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}
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bytes_read += bpb.sectors_per_cluster * 512;
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uint32_t fat_sector = cluster * 4 / 512;
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uint32_t fat_offset = cluster * 4 % 512;
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if (ide_read48(fat32_drive, fat_start_lba + fat_sector, 1, sector) != 0)
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{
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return -1;
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}
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cluster = *(uint32_t *)(sector + fat_offset) & 0x0FFFFFFF;
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}
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return bytes_read;
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}
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return -2;
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}
|
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int32_t fat32_write_file(const char *name, const uint8_t *buffer, uint32_t len)
|
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{
|
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uint32_t lba = cluster_to_lba(current_directory_cluster);
|
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if (ide_read48(fat32_drive, lba, 1, sector) != 0)
|
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{
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return -1;
|
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}
|
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|
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for (int32_t i = 0; i < 512; i += 32)
|
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{
|
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char *entry = (char *)§or[i];
|
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if ((uint8_t)entry[0] == 0x00) break;
|
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if ((uint8_t)entry[0] == 0xE5) continue;
|
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|
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char entry_name[12];
|
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memcpy(entry_name, entry, 11);
|
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entry_name[11] = 0;
|
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for (int j = 0; j < 11; j++)
|
||||
{
|
||||
if (entry_name[j] == ' ')
|
||||
{
|
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entry_name[j] = 0;
|
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}
|
||||
}
|
||||
|
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if (strncmp(entry_name, name, 11) != 0)
|
||||
{
|
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continue;
|
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}
|
||||
|
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uint32_t cluster = (*(uint16_t *)(entry + 26)) | ((*(uint16_t *)(entry + 20)) << 16);
|
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uint32_t bytes_written = 0;
|
||||
|
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while (cluster < 0x0FFFFFF8 && bytes_written < len)
|
||||
{
|
||||
uint32_t lba = cluster_to_lba(cluster);
|
||||
if (ide_write48(fat32_drive, lba, bpb.sectors_per_cluster, buffer + bytes_written) != 0)
|
||||
{
|
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return -1;
|
||||
}
|
||||
|
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bytes_written += bpb.sectors_per_cluster * 512;
|
||||
|
||||
if (bytes_written < len)
|
||||
{
|
||||
uint32_t fat_sector = cluster * 4 / 512;
|
||||
uint32_t fat_offset = cluster * 4 % 512;
|
||||
|
||||
if (ide_read48(fat32_drive, fat_start_lba + fat_sector, 1, sector) != 0)
|
||||
{
|
||||
return -1;
|
||||
}
|
||||
|
||||
uint32_t next_cluster = find_free_cluster();
|
||||
if (next_cluster == 0)
|
||||
{
|
||||
return -3;
|
||||
}
|
||||
|
||||
*(uint32_t *)(sector + fat_offset) = next_cluster & 0x0FFFFFFF;
|
||||
|
||||
if (ide_write48(fat32_drive, fat_start_lba + fat_sector, 1, sector) != 0)
|
||||
{
|
||||
return -1;
|
||||
}
|
||||
|
||||
cluster = next_cluster;
|
||||
}
|
||||
else
|
||||
{
|
||||
uint32_t fat_sector = cluster * 4 / 512;
|
||||
uint32_t fat_offset = cluster * 4 % 512;
|
||||
|
||||
if (ide_read48(fat32_drive, fat_start_lba + fat_sector, 1, sector) != 0)
|
||||
{
|
||||
return -1;
|
||||
}
|
||||
|
||||
*(uint32_t *)(sector + fat_offset) = 0x0FFFFFFF;
|
||||
|
||||
if (ide_write48(fat32_drive, fat_start_lba + fat_sector, 1, sector) != 0)
|
||||
{
|
||||
return -1;
|
||||
}
|
||||
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
*(uint32_t *)(entry + 28) = len;
|
||||
if (ide_write48(fat32_drive, lba, 1, sector) != 0)
|
||||
{
|
||||
return -1;
|
||||
}
|
||||
|
||||
return bytes_written;
|
||||
}
|
||||
return -2;
|
||||
}
|
||||
|
||||
int32_t fat32_create_file(const char *name) {
|
||||
uint32_t root_lba = cluster_to_lba(bpb.root_cluster);
|
||||
|
||||
// Read root directory cluster sector (assuming 1 sector here for simplicity)
|
||||
if (ide_read48(fat32_drive, root_lba, 1, sector) != 0)
|
||||
return -1;
|
||||
|
||||
char formatted_name[11];
|
||||
format_83_name(name, formatted_name);
|
||||
|
||||
for (int32_t i = 0; i < 512; i += 32) {
|
||||
uint8_t *entry = §or[i];
|
||||
if (entry[0] == 0x00 || entry[0] == 0xE5) {
|
||||
// Found free directory entry, clear it
|
||||
memset(entry, 0, 32);
|
||||
|
||||
// Copy formatted filename
|
||||
memcpy(entry, formatted_name, 11);
|
||||
|
||||
// Set attributes to Archive (normal file)
|
||||
entry[11] = 0x20;
|
||||
|
||||
// Allocate first cluster for the file
|
||||
uint32_t free_cluster = find_free_cluster();
|
||||
if (free_cluster == 0) {
|
||||
return -2; // No free cluster
|
||||
}
|
||||
|
||||
// Mark cluster as end-of-chain in FAT
|
||||
uint32_t fat_sector = fat_start_lba + (free_cluster * 4) / 512;
|
||||
uint32_t fat_offset = (free_cluster * 4) % 512;
|
||||
if (ide_read48(fat32_drive, fat_sector, 1, sector) != 0)
|
||||
return -1;
|
||||
|
||||
*(uint32_t *)(sector + fat_offset) = 0x0FFFFFFF; // end of cluster chain
|
||||
if (ide_write48(fat32_drive, fat_sector, 1, sector) != 0)
|
||||
return -1;
|
||||
|
||||
// Set first cluster in directory entry (split high and low 16 bits)
|
||||
entry[20] = (free_cluster >> 16) & 0xFF;
|
||||
entry[21] = (free_cluster >> 24) & 0xFF;
|
||||
entry[26] = free_cluster & 0xFF;
|
||||
entry[27] = (free_cluster >> 8) & 0xFF;
|
||||
|
||||
// Set file size = 0
|
||||
entry[28] = 0;
|
||||
entry[29] = 0;
|
||||
entry[30] = 0;
|
||||
entry[31] = 0;
|
||||
|
||||
// Write back directory sector
|
||||
if (ide_write48(fat32_drive, root_lba, 1, sector) != 0)
|
||||
return -1;
|
||||
|
||||
return 0; // Success
|
||||
}
|
||||
}
|
||||
|
||||
return -3; // No free directory entry found
|
||||
}
|
||||
|
||||
int32_t fat32_create_directory(const char *name) {
|
||||
uint32_t lba = cluster_to_lba(current_directory_cluster);
|
||||
if (ide_read48(fat32_drive, lba, 1, sector) != 0)
|
||||
return -1;
|
||||
|
||||
for (int32_t i = 0; i < 512; i += 32) {
|
||||
char *entry = (char *)§or[i];
|
||||
if ((uint8_t)entry[0] == 0x00 || (uint8_t)entry[0] == 0xE5) {
|
||||
memset(entry, 0, 32);
|
||||
memcpy(entry, name, strlen(name) > 11 ? 11 : strlen(name));
|
||||
entry[11] = FAT32_ATTR_DIRECTORY;
|
||||
|
||||
uint32_t cluster = 6;
|
||||
*(uint16_t *)(entry + 26) = cluster & 0xFFFF;
|
||||
*(uint16_t *)(entry + 20) = (cluster >> 16) & 0xFFFF;
|
||||
*(uint32_t *)(entry + 28) = 0;
|
||||
|
||||
if (ide_write48(fat32_drive, lba, 1, sector) != 0)
|
||||
return -1;
|
||||
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
return -2;
|
||||
}
|
||||
|
||||
int32_t fat32_change_directory(const char *name) {
|
||||
uint32_t lba = cluster_to_lba(current_directory_cluster);
|
||||
if (ide_read48(fat32_drive, lba, 1, sector) != 0)
|
||||
return -1;
|
||||
|
||||
for (int32_t i = 0; i < 512; i += 32) {
|
||||
char *entry = (char *)§or[i];
|
||||
if ((uint8_t)entry[0] == 0x00) break;
|
||||
if ((uint8_t)entry[0] == 0xE5) continue;
|
||||
|
||||
char entry_name[12];
|
||||
memcpy(entry_name, entry, 11);
|
||||
entry_name[11] = 0;
|
||||
for (int32_t j = 0; j < 11; j++)
|
||||
if (entry_name[j] == ' ') entry_name[j] = 0;
|
||||
|
||||
if (strncmp(entry_name, name, 11) != 0) continue;
|
||||
|
||||
if (!(entry[11] & FAT32_ATTR_DIRECTORY))
|
||||
return -2;
|
||||
|
||||
current_directory_cluster = (*(uint16_t *)(entry + 26)) | ((*(uint16_t *)(entry + 20)) << 16);
|
||||
return 0;
|
||||
}
|
||||
return -3;
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user