Rick Rongen
20ab9e1d6e
Added late gdt setup with initial tss Moved attributes to include root Reordered some imports
97 lines
2.3 KiB
C
97 lines
2.3 KiB
C
//
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// Created by rick on 11-03-21.
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//
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#include <attributes.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <myke/fs/blockdev.h>
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typedef struct {
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char filename[100];
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uint64_t mode;
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uint64_t uid;
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uint64_t gid;
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char filesize[12];
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char lastmod[12];
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uint64_t checksum;
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char type;
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char linked[100];
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char magic[6];
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char version[2];
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char username[32];
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char groupname[32];
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uint64_t device_major;
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uint64_t device_minor;
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char prefix[155];
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} att_packed ustar_sector;
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typedef struct {
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ustar_sector sector;
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uint32_t lba;
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} ustar_inode;
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typedef struct {
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ustar_inode *first_inode;
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const block_device_t *device;
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} ustar_fs;
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const char *ustar_magic = "ustar";
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const char *ustar_version = "00";
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#define USTAR_TYPE_FILE '0'
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#define USTAR_TYPE_LINK '1'
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#define USTAR_TYPE_SYMBOL '2'
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#define USTAR_TYPE_CHAR '3'
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#define USTAR_TYPE_BLOCK '4'
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#define USTAR_TYPE_DIR '5'
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#define USTAR_TYPE_FIFO '6'
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#define SECTOR_SIZE 512
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long ustar_oct_to_long(char *oct, uint32_t size) {
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char value[size + 1];
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memcpy(value, oct, size);
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value[size] = 0;
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return strtol(value, NULL, 8);
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}
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bool ustar_sector_valid(ustar_sector *sector) {
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return strncmp(ustar_magic, sector->magic, 6) == 0;
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}
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ustar_sector *ustar_next(ustar_sector *current) {
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if (ustar_sector_valid(current)) {
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return NULL;
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}
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long filesize = ustar_oct_to_long(current->filesize, 12);
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long offset = (((filesize + SECTOR_SIZE - 1) / SECTOR_SIZE) + 1) * SECTOR_SIZE;
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ustar_sector *next = ((void *) current) + offset;
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return ustar_sector_valid(next) ? next : NULL;
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}
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uint8_t ustar_check_device(const block_device_t *device, uint8_t *first_sector) {
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ustar_sector *sector = (ustar_sector *) first_sector;
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if (!ustar_sector_valid(sector)) {
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return BLOCK_DEV_DRIVER_CHECK_NO_MATCH;
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}
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ustar_fs *fs = malloc(sizeof(ustar_fs));
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fs->first_inode = malloc(sizeof(ustar_inode));
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memcpy(&fs->first_inode->sector, first_sector, sizeof(ustar_sector));
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fs->first_inode->lba = 0;
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fs->device = device;
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return BLOCK_DEV_DRIVER_CHECK_OK;
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}
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BLOCK_DEV_DRIVER(300) = {
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.name = "ustar",
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.check_device = ustar_check_device,
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.free_device = NULL,
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}; |