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KimisOS
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KimisOS/tools/diskwrite.c

241 lines
8.1 KiB
C
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#define FILE_END 0xFFFFFFFF
#define FILE_FREE 0x00000000
#define FAT_ATTR_READONLY 0x01
#define FAT_ATTR_HIDDEN 0x02
#define FAT_ATTR_SYSTEM 0x04
#define FAT_ATTR_VOLID 0x08
#define FAT_ATTR_DIR 0x10
#define FAT_ATTR_ARCHIVE 0x20
#define FAT_LFN FAT_ATTR_READONLY | FAT_ATTR_HIDDEN | FAT_ATTR_SYSTEM | FAT_ATTR_VOLID
typedef uint8_t *buffer_t;
typedef struct{
uint8_t jmp[3];
char oem[8];
uint16_t bytes_per_sector;
uint8_t sectors_per_cluster;
uint16_t reserved_sectors;
uint8_t fat_count;
uint16_t root_dir_entries;
uint16_t sectors_in_volume_small;
uint8_t media_descriptor;
uint16_t sectors_per_fat_small;
uint16_t sectors_per_track;
uint16_t heads_per_volume;
uint32_t partition_start;
uint32_t large_sector_count;
uint32_t sectors_per_fat;
uint16_t flags;
uint16_t fat_verno;
uint32_t root_dir_cluster;
uint16_t fsinfo_sector;
uint16_t backup_boot_sector;
uint8_t reserved[12];
uint8_t drive_no;
uint8_t nt_flags;
uint8_t sig;
uint32_t vol_uuid;
char volid[11];
char sysid[8];
}__attribute__((packed))fat_bpb_t;
typedef struct{
uint32_t lead_sig;
uint8_t reserved[480];
uint32_t sig0;
uint32_t last_free_cluster;
uint32_t cluster_search_start;
uint8_t reserved0[12];
uint32_t trail_sig;
}fsinfo_t;
typedef struct{
fat_bpb_t bpb;
fsinfo_t fsinfo;
uint32_t *file_table;
}fat_info;
typedef struct{
char filename[8];
char ext[3];
uint8_t attributes;
uint8_t ntflags;
uint8_t creation_time;
uint16_t create_time;
uint16_t create_date;
uint16_t last_access;
uint16_t start_cluster_high;
uint16_t last_modification_time;
uint16_t last_modification_date;
uint16_t start_cluster_low;
uint32_t size_bytes;
}__attribute__((packed)) file_t;
int verbose = 0;
int read_sector(FILE *file, uint32_t sector_start, uint32_t count, buffer_t buf){
verbose && printf("Attempting to read bytes 0x%x - 0x%x\n", sector_start * 512, sector_start * 512 + count * 512);
// rewind(file);
int result = fseek(file, sector_start * 512, SEEK_SET);
if(result){
return result;
}
fflush(stdout);
memset(buf, 0, count * 512);
result = fread(buf, 512, count, file);
return result;
}
int write_sector(FILE *file, uint32_t sector_start, uint32_t count, buffer_t buf){
// printf("pre seek\n");
// rewind(file);
int result = fseek(file, sector_start * 512, SEEK_SET);
if(result){
printf("Error during seek\n");
return result;
}
// printf("pre write\n");
result = fwrite(buf, 512, count, file);
return result;
}
uint32_t find_free_cluster(fat_info *info){
verbose && printf("finding free cluster\n");
uint32_t start = info->fsinfo.cluster_search_start;
if(start < 2){
start = 2;
}
for(int i = start; i < (info->bpb.sectors_per_fat * info->bpb.bytes_per_sector)/4; i++){
// printf("%d, %p\n", i);
if(info->file_table[i]) continue;
return i;
}
}
void write_cluster_value(fat_info *info, uint32_t value, uint32_t cluster){
printf("writing cluster :3\n");
for(int i = 0; i < info->bpb.fat_count; i++){
info->file_table[cluster + i * info->bpb.sectors_per_fat * (info->bpb.bytes_per_sector/4)] = value;
}
}
int read_file(fat_info *info, file_t *file, buffer_t *buffer, size_t size, FILE *disk){
if(!file){
uint32_t first_cluster = info->bpb.root_dir_cluster;
uint32_t next_cluster = first_cluster;
// while
return 1;
}
uint32_t first_cluster = file->start_cluster_low | (file->start_cluster_high << 16);
uint32_t clusters = (size / (info->bpb.bytes_per_sector * info->bpb.sectors_per_cluster )) + 1;
uint8_t *new_buffer = calloc(1, clusters * (info->bpb.bytes_per_sector * info->bpb.sectors_per_cluster));
}
//write size bytes to file from buffer. no value may be zero or null.
int write_file(fat_info *info, file_t *file, buffer_t *buffer, size_t size, FILE *disk){
if(!file){
return 1;
}
uint32_t first_cluster = file->start_cluster_low | (file->start_cluster_high << 16);
uint32_t clusters = (size / (info->bpb.bytes_per_sector * info->bpb.sectors_per_cluster )) + 1;
uint8_t *new_buffer = calloc(1, clusters * (info->bpb.bytes_per_sector * info->bpb.sectors_per_cluster ));
memcpy(new_buffer, buffer, size);
uint32_t cluster = first_cluster;
for(uint32_t i = 0; i < clusters; i++){
write_sector(disk, info->bpb.reserved_sectors + info->bpb.partition_start + (cluster * info->bpb.sectors_per_cluster), info->bpb.sectors_per_cluster, new_buffer + i * info->bpb.sectors_per_cluster * info->bpb.bytes_per_sector);
uint32_t next_cluster = info->file_table[cluster];
if(next_cluster == -1){
next_cluster = find_free_cluster(info);
write_cluster_value(info, next_cluster, cluster);
}
cluster = next_cluster;
}
write_cluster_value(info, -1, cluster);
return size * info->bpb.bytes_per_sector * info->bpb.sectors_per_cluster;
}
int create_file(char *path, fat_info *info, FILE *file){
}
int fat_write_back(FILE *file, fat_info *info){
int res = 0;
if(res = write_sector(file, info->bpb.reserved_sectors, info->bpb.sectors_per_fat * info->bpb.fat_count, (buffer_t)info->file_table) == 0){
verbose && printf("Error during write: %d\n", res);
}
}
int detect_repair_fs(FILE *file, fat_info *info){
//perform sanity checks and set data if wrong
buffer_t boot_sector = malloc(512);
read_sector(file, 0, 1, boot_sector);
info->bpb = *(fat_bpb_t *)boot_sector;
verbose && printf("\033[0;33mBytes per sector: %d\n", info->bpb.bytes_per_sector);
verbose && printf("Sectors per cluster: %x\n", info->bpb.sectors_per_cluster);
info->bpb.bytes_per_sector += 512 * info->bpb.bytes_per_sector == 0;
info->bpb.sectors_per_cluster += 8 * info->bpb.sectors_per_cluster == 0;
verbose && printf("Reserved sectors %d\n", info->bpb.reserved_sectors);
info->bpb.reserved_sectors += 32 * info->bpb.reserved_sectors == 0;
verbose && printf("Root directory cluster: %d\n", info->bpb.root_dir_cluster);
info->bpb.root_dir_cluster += 2 * info->bpb.root_dir_cluster == 0;
memcpy(boot_sector, &info->bpb, sizeof(fat_bpb_t));
write_sector(file, 0, 1, boot_sector);
verbose && printf("\033[1;31mAllocating File Table: 0x%x bytes\033[0m\n", info->bpb.sectors_per_fat * info->bpb.fat_count * info->bpb.bytes_per_sector);
info->file_table = malloc(info->bpb.sectors_per_fat * info->bpb.fat_count * info->bpb.bytes_per_sector);
read_sector(file, info->bpb.reserved_sectors, info->bpb.sectors_per_fat * info->bpb.fat_count, (buffer_t)info->file_table);
}
int main(int argc, char **argv){
char **files = malloc(512);
int filec = 0;
FILE *output_file = 0;
fat_info info = {};
if(argc == 1 || !strcmp(argv[1], "-h")){
printf("write files to virtual disk\n");
printf("Usage:\ndiskwrite <input files> -o <output file>");
printf("\n-h: Help");
printf("\n-o: Specify output file\n");
printf("-v: Verbose\n");
}
for(int i = 1; i < argc; i++){
if(!strcmp(argv[i], "-o")){
i++;
if(i >= argc){
printf("Error: No output file specified!\n");
}
verbose && printf("OF: %s\n", argv[i]);
output_file = fopen(argv[i], "r+");
continue;
}
if(!strcmp(argv[i], "-v")){
verbose = 1;
continue;
}
files[filec++] = argv[i];
verbose && printf("IF: %s\n", argv[i]);
}
if(filec == 0){
printf("Nothing to do, no files to write\n");
return 0;
}
detect_repair_fs(output_file, &info);
for(int i = 0; i < filec; i++){
printf("\033[1;34mWriting file %d in list: %s\033[0m\n", i, files[i]);
create_file(files[i], &info, output_file);
}
fat_write_back(output_file, &info);
verbose && printf("Finished. Exiting...\n");
return 0;
}
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