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CoolPotOS/fs/fat.c

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文件系统重构
2024-05-12 14:34:03 +08:00
/*
* PlantsOS fat FileSystem
* Copyright by min0911
*/
#include "../include/vdisk.h"
#include "../include/fat.h"
#include "../include/memory.h"
#include "../include/list.h"
#include "../include/common.h"
#include "../include/file.h"
#include "../include/cmos.h"
#include "../include/floppy.h"
#include "../include/timer.h"
static inline int get_fat_date(unsigned short year, unsigned short month,
unsigned short day) {
year -= 1980;
unsigned short date = 0;
date |= (year & 0x7f) << 9;
date |= (month & 0x0f) << 5;
date |= (day & 0x1f);
return date;
}
static inline int get_fat_time(unsigned short hour, unsigned short minute) {
unsigned short time = 0;
time |= (hour & 0x1f) << 11;
time |= (minute & 0x3f) << 5;
return time;
}
void read_fat(unsigned char *img, int *fat, unsigned char *ff, int max,
int type) {
if (type == 12) {
for (int i = 0, j = 0; i < max; i += 2) {
fat[i + 0] = (img[j + 0] | img[j + 1] << 8) & 0xfff;
fat[i + 1] = (img[j + 1] >> 4 | img[j + 2] << 4) & 0xfff;
j += 3;
}
// 保留簇
ff[0] = 1;
ff[1] = 1;
for (int i = 1; i < max; i++) {
if (fat[i] > 0 && fat[i] < 0xff0) {
ff[fat[i]] = 1;
} else if (fat[i] >= 0xff0 && fat[i] <= 0xfff) {
ff[i + 1] = 1;
}
}
} else if (type == 16) {
unsigned short *p = (unsigned short *)img;
for (int i = 0; i != max; i++) {
fat[i] = p[i];
}
ff[0] = 1;
ff[1] = 1;
for (int i = 1; i < max; i++) {
if (fat[i] > 0 && fat[i] < 0xfff0) {
ff[fat[i]] = 1;
} else if (fat[i] >= 0xfff0 && fat[i] <= 0xffff) {
ff[i + 1] = 1;
}
}
} else if (type == 32) {
unsigned int *p = (unsigned int *)img;
for (int i = 0; i != max; i++) {
fat[i] = p[i];
}
ff[0] = 1;
ff[1] = 1;
for (int i = 1; i < max; i++) {
if (fat[i] > 0 && fat[i] < 0xffffff0) {
ff[fat[i]] = 1;
} else if (fat[i] >= 0xffffff0 && fat[i] <= 0xfffffff) {
ff[i + 1] = 1;
}
}
}
return;
}
int get_directory_max(struct FAT_FILEINFO *directory, vfs_t *vfs) {
if (directory == get_dm(vfs).root_directory) {
return get_dm(vfs).RootMaxFiles;
}
for (int i = 1; FindForCount(i, get_dm(vfs).directory_list) != NULL; i++) {
struct List *l = FindForCount(i, get_dm(vfs).directory_list);
if ((struct FAT_FILEINFO *)l->val == directory) {
return (int)FindForCount(i, get_dm(vfs).directory_max_list)->val;
}
}
}
void file_loadfile(int clustno, int size, char *buf, int *fat, vfs_t *vfs) {
if (!size) {
return;
}
void *img = kmalloc(((size - 1) / get_dm(vfs).ClustnoBytes + 1) *
get_dm(vfs).ClustnoBytes);
for (int i = 0; i != (size - 1) / get_dm(vfs).ClustnoBytes + 1; i++) {
uint32_t sec = (get_dm(vfs).FileDataAddress +
(clustno - 2) * get_dm(vfs).ClustnoBytes) /
get_dm(vfs).SectorBytes;
Disk_Read(sec, get_dm(vfs).ClustnoBytes / get_dm(vfs).SectorBytes,
img + i * get_dm(vfs).ClustnoBytes, vfs->disk_number);
clustno = fat[clustno];
}
memcpy((void *)buf, img, size);
kfree(img);
return;
}
void file_savefile(int clustno, int size, char *buf, int *fat,
unsigned char *ff, vfs_t *vfs) {
uint32_t clustall = 0;
int tmp = clustno;
int end = clustno_end(get_dm(vfs).type);
while (fat[clustno] != end) { // 计算文件占多少Fat项 Fat项 = 大小 / 簇大小 + 1
clustno = fat[clustno];
clustall++;
}
int old_clustno = clustno;
clustno = tmp;
int alloc_size;
if (size >
(clustall + 1) *
get_dm(vfs).ClustnoBytes) { // 新大小 > (旧大小 / 簇大小 + 1) * 簇大小
// 请求内存大小 = (新大小 / 簇大小 + 1) * 簇大小
alloc_size =
((size - 1) / get_dm(vfs).ClustnoBytes + 1) * get_dm(vfs).ClustnoBytes;
// 分配Fat（这里需要在写盘前分配）
for (int size1 = size; size1 > ((clustall + 1) * get_dm(vfs).ClustnoBytes);
size1 -= get_dm(vfs).ClustnoBytes) {
for (int i = 0; i != get_dm(vfs).FatMaxTerms; i++) {
if (!ff[i]) {
fat[old_clustno] = i;
old_clustno = i;
ff[i] = 1;
break;
}
}
}
fat[old_clustno] = end; // 结尾Fat
ff[old_clustno] = 1;
} else if (size <=
(clustall + 1) *
get_dm(vfs).ClustnoBytes) { // 新大小 <= (旧大小 / 簇大小
// + 1) * 簇大小
// 请求内存大小 = (旧大小 / 簇大小 + 1) * 簇大小
alloc_size = (clustall + 1) * get_dm(vfs).ClustnoBytes;
// 这里不分配Fat的原因是要清空更改后多余的数据
}
void *img = kmalloc(alloc_size);
memclean((char *)img, alloc_size);
memcpy(img, buf, size); // 把要写入的数据复制到新请求的内存地址
for (int i = 0; i != (alloc_size / get_dm(vfs).ClustnoBytes); i++) {
uint32_t sec = (get_dm(vfs).FileDataAddress +
(clustno - 2) * get_dm(vfs).ClustnoBytes) /
get_dm(vfs).SectorBytes;
Disk_Write(sec, get_dm(vfs).ClustnoBytes / get_dm(vfs).SectorBytes,
img + i * get_dm(vfs).ClustnoBytes, vfs->disk_number);
clustno = fat[clustno];
}
kfree(img);
if (size <
clustall *
get_dm(vfs).ClustnoBytes) { // 新大小 < (旧大小 / 簇大小) * 簇大小
// 分配Fat（中间情况没必要分配）
int i = old_clustno;
for (int size1 = clustall * get_dm(vfs).ClustnoBytes; size1 > size;
size1 -= get_dm(vfs).ClustnoBytes) {
fat[i] = 0;
ff[i] = 0;
for (int j = 0; j != get_dm(vfs).FatMaxTerms; j++) {
if (fat[j] == i) {
i = j;
}
}
}
old_clustno = i;
fat[old_clustno] = end;
ff[old_clustno] = 1;
}
file_savefat(fat, 0, get_dm(vfs).FatMaxTerms, vfs);
}
void file_savefat(int *fat, int clustno, int length, vfs_t *vfs) {
unsigned char *img = get_dm(vfs).ADR_DISKIMG + get_dm(vfs).Fat1Address;
int size, sec;
if (get_dm(vfs).type == 12) {
for (int i = 0; i <= length; i++) {
if ((clustno + i) % 2 == 0) {
img[(clustno + i) * 3 / 2 + 0] = fat[clustno + i] & 0xff;
img[(clustno + i) * 3 / 2 + 1] =
(fat[clustno + i] >> 8 | (img[(clustno + i) * 3 / 2 + 1] & 0xf0)) &
0xff;
} else if ((clustno + i) % 2 != 0) {
img[(clustno + i - 1) * 3 / 2 + 1] =
((img[(clustno + i - 1) * 3 / 2 + 1] & 0x0f) | fat[clustno + i]
<< 4) &
0xff;
img[(clustno + i - 1) * 3 / 2 + 2] = (fat[clustno + i] >> 4) & 0xff;
}
}
size = length * 3 / 2 - 1;
sec = clustno * 3 / 2;
} else if (get_dm(vfs).type == 16) {
for (int i = 0; i <= length; i++) {
img[(clustno + i) * 2 + 0] = fat[clustno + i] & 0xff;
img[(clustno + i) * 2 + 1] = (fat[clustno + i] >> 8) & 0xff;
}
size = length * 2 - 1;
sec = clustno * 2;
} else if (get_dm(vfs).type == 32) {
for (int i = 0; i <= length; i++) {
img[(clustno + i) * 4 + 0] = fat[clustno + i] & 0xff;
img[(clustno + i) * 4 + 1] = (fat[clustno + i] >> 8) & 0xff;
img[(clustno + i) * 4 + 2] = (fat[clustno + i] >> 16) & 0xff;
img[(clustno + i) * 4 + 3] = fat[clustno + i] >> 24;
}
size = length * 4 - 1;
sec = clustno * 4;
}
Disk_Write((get_dm(vfs).Fat1Address + sec) / get_dm(vfs).SectorBytes,
size / get_dm(vfs).SectorBytes + 1,
get_dm(vfs).ADR_DISKIMG + get_dm(vfs).Fat1Address,
vfs->disk_number);
Disk_Write((get_dm(vfs).Fat2Address + sec) / get_dm(vfs).SectorBytes,
size / get_dm(vfs).SectorBytes + 1,
get_dm(vfs).ADR_DISKIMG + get_dm(vfs).Fat2Address,
vfs->disk_number);
}
struct FAT_FILEINFO *file_search(char *name, struct FAT_FILEINFO *finfo,
int max) {
int i, j;
char s[12];
for (j = 0; j < 11; j++) {
s[j] = ' ';
}
j = 0;
for (i = 0; name[i] != 0; i++) {
if (j >= 11) {
return 0; //没有找到
}
if (name[i] == '.' && j <= 8) {
j = 8;
} else {
s[j] = name[i];
if ('a' <= s[j] && s[j] <= 'z') {
//将小写字母转换为大写字母
s[j] -= 0x20;
}
j++;
}
}
for (i = 0; i < max;) {
if (finfo[i].name[0] == 0x00) {
break;
}
if ((finfo[i].type & 0x18) == 0) {
for (j = 0; j < 11; j++) {
if (finfo[i].name[j] != s[j]) {
goto next;
}
}
return finfo + i; //找到文件
}
next:
i++;
}
return 0; //没有找到
}
struct FAT_FILEINFO *dict_search(char *name, struct FAT_FILEINFO *finfo,
int max) {
int i, j;
char s[12];
for (j = 0; j < 11; j++) {
s[j] = ' ';
}
j = 0;
for (i = 0; name[i] != 0; i++) {
if (j >= 11) {
return 0; //没有找到
} else {
s[j] = name[i];
if ('a' <= s[j] && s[j] <= 'z') {
//将小写字母转换为大写字母
s[j] -= 0x20;
}
j++;
}
}
for (i = 0; i < max;) {
if (finfo[i].name[0] == 0x00) {
break;
}
if (finfo[i].type == 0x10) {
for (j = 0; j < 11; j++) {
if (finfo[i].name[j] != s[j]) {
goto next;
}
}
return finfo + i; // 找到文件
}
next:
i++;
}
return 0; //没有找到
}
struct FAT_FILEINFO *Get_File_Address(char *path1, vfs_t *vfs) {
// TODO: Modifly it
struct FAT_FILEINFO *bmpDict = get_now_dir(vfs);
int drive_number = vfs->disk_number;
char *path = (char *)kmalloc(strlen(path1) + 1);
char *bmp = path;
strcpy(path, path1);
strtoupper(path);
if (strncmp("/", path, 1) == 0) {
path += 1;
bmpDict = get_dm(vfs).root_directory;
}
if (path[0] == '\\' || path[0] == '/') {
//跳过反斜杠和正斜杠
for (int i = 0; i < strlen(path); i++) {
if (path[i] != '\\' && path[i] != '/') {
path += i;
break;
}
}
}
char *temp_name = (char *)kmalloc(128);
struct FAT_FILEINFO *finfo = get_dm(vfs).root_directory;
int i = 0;
while (1) {
int j;
for (j = 0; i < strlen(path); i++, j++) {
if (path[i] == '\\' || path[i] == '/') {
temp_name[j] = '\0';
i++;
break;
}
temp_name[j] = path[i];
}
finfo = dict_search(temp_name, bmpDict, get_directory_max(bmpDict, vfs));
if (finfo == 0) {
if (path[i] != '\0') {
kfree((void *)temp_name);
kfree((void *)bmp);
return 0;
}
finfo = file_search(temp_name, bmpDict, get_directory_max(bmpDict, vfs));
if (finfo == 0) {
kfree((void *)temp_name);
kfree((void *)bmp);
return 0;
} else {
goto END;
}
} else {
if (get_clustno(finfo->clustno_high, finfo->clustno_low) != 0) {
for (int count = 1;
FindForCount(count, get_dm(vfs).directory_clustno_list) != NULL;
count++) {
struct List *list =
FindForCount(count, get_dm(vfs).directory_clustno_list);
if (get_clustno(finfo->clustno_high, finfo->clustno_low) ==
list->val) {
list = FindForCount(count, get_dm(vfs).directory_list);
bmpDict = (struct FAT_FILEINFO *)list->val;
break;
}
}
} else {
bmpDict = get_dm(vfs).root_directory;
}
memclean(temp_name, 128);
}
}
END:
kfree((void *)temp_name);
kfree((void *)bmp);
return finfo;
}
int del(char *cmdline, vfs_t *vfs) {
// 删除某个文件
char *name = cmdline;
int i;
struct FAT_FILEINFO *finfo;
finfo = Get_File_Address(name, vfs);
if (finfo == 0 || finfo->type == 0x01 || finfo->type == 0x04) {
return 0;
}
file_savefile(get_clustno(finfo->clustno_high, finfo->clustno_low), 0, NULL,
get_dm(vfs).fat, get_dm(vfs).FatClustnoFlags, vfs);
finfo->name[0] = 0xe5;
get_dm(vfs).fat[get_clustno(finfo->clustno_high, finfo->clustno_low)] = 0;
get_dm(vfs)
.FatClustnoFlags[get_clustno(finfo->clustno_high, finfo->clustno_low)] =
false;
file_saveinfo(Get_dictaddr(name, vfs), vfs);
file_savefat(get_dm(vfs).fat,
get_clustno(finfo->clustno_high, finfo->clustno_low), 1, vfs);
return 1;
}
struct FAT_FILEINFO *Get_dictaddr(char *path1, vfs_t *vfs) {
// TODO: Modifly it
struct FAT_FILEINFO *bmpDict = get_now_dir(vfs);
int drive_number = vfs->disk_number;
char *path = (char *)kmalloc(strlen(path1) + 1);
char *bmp = path;
strcpy(path, path1);
strtoupper(path);
if (strncmp("/", path, 1) == 0) {
path += 1;
bmpDict = get_dm(vfs).root_directory;
}
if (path[0] == '\\' || path[0] == '/') {
// 跳过反斜杠和正斜杠
for (int i = 0; i < strlen(path); i++) {
if (path[i] != '\\' && path[i] != '/') {
path += i;
break;
}
}
}
char *temp_name = (char *)kmalloc(128);
struct FAT_FILEINFO *finfo;
int i = 0;
while (1) {
int j;
for (j = 0; i < strlen(path); i++, j++) {
if (path[i] == '\\' || path[i] == '/') {
temp_name[j] = '\0';
i++;
break;
}
temp_name[j] = path[i];
}
finfo = dict_search(temp_name, bmpDict, get_directory_max(bmpDict, vfs));
if (finfo == 0) {
if (path[i] != 0) {
bmpDict = NULL;
}
goto END;
} else {
if (get_clustno(finfo->clustno_high, finfo->clustno_low) != 0) {
for (int count = 1;
FindForCount(count, get_dm(vfs).directory_clustno_list) != NULL;
count++) {
struct List *list =
FindForCount(count, get_dm(vfs).directory_clustno_list);
if (get_clustno(finfo->clustno_high, finfo->clustno_low) ==
list->val) {
list = FindForCount(count, get_dm(vfs).directory_list);
bmpDict = (struct FAT_FILEINFO *)list->val;
break;
}
}
} else {
bmpDict = get_dm(vfs).root_directory;
}
memclean(temp_name, 128);
if (path[i] == '\0') {
goto END;
}
}
}
END:
kfree((void *)temp_name);
kfree((void *)bmp);
return bmpDict;
}
int deldir(char *path, vfs_t *vfs) {
struct FAT_FILEINFO *finfo = Get_dictaddr(path, vfs);
if (finfo == Get_dictaddr(".", vfs)) {
return 0;
}
struct FAT_FILEINFO *f = get_now_dir(vfs);
get_now_dir(vfs) = finfo;
for (int i = 2; finfo[i].name[0] != '\0'; i++) {
if (finfo[i].type == 0x10 && finfo[i].name[0] != 0xe5) {
char s[30];
int j = 0;
for (; finfo[i].name[j] != ' '; j++) {
s[j] = finfo[i].name[j];
}
s[j] = '\0';
// printk("(CALL)DEL DIR:%s\n", s);
if (deldir(s, vfs) == -1) {
return 0;
}
// return -1;
}
}
for (int i = 2; finfo[i].name[0] != '\0'; i++) {
if (finfo[i].name[0] != 0xe5 && finfo[i].type != 0x10) {
char s[30];
int p = 0;
for (int j = 0; finfo[i].name[j] != ' '; j++, p++) {
s[p] = finfo[i].name[j];
}
if (finfo[i].ext[0] != ' ') {
s[p++] = '.';
for (int j = 0; finfo[i].ext[j] != ' ' || j != 3; j++, p++) {
s[p] = finfo[i].ext[j];
}
}
s[p] = '\0';
// printk("(IN)DEL FILE:%s\n", s);
if (del(s, vfs) == -1) {
return 0;
}
}
}
get_now_dir(vfs) = f;
struct FAT_FILEINFO *root_finfo;
if (finfo[1].clustno_low == 0) {
root_finfo = get_dm(vfs).root_directory;
} else {
for (int i = 1; FindForCount(i, get_dm(vfs).directory_clustno_list) != NULL;
i++) {
if (FindForCount(i, get_dm(vfs).directory_clustno_list)->val ==
finfo[1].clustno_low) {
root_finfo =
(struct FAT_FILEINFO *)FindForCount(i, get_dm(vfs).directory_list)
->val;
// printk("FIND ROOT %08x\n", root_finfo);
}
}
}
for (int i = 0; root_finfo[i].name[0] != '\0'; i++) {
// printk("ROOT FILE:%s\n", root_finfo[i].name);
if (root_finfo[i].clustno_low == finfo[0].clustno_low) {
root_finfo[i].name[0] = 0xe5;
break;
}
}
get_dm(vfs).fat[get_clustno(finfo->clustno_high, finfo->clustno_low)] = 0;
get_dm(vfs)
.FatClustnoFlags[get_clustno(finfo->clustno_high, finfo->clustno_low)] =
false;
file_saveinfo(Get_dictaddr(path, vfs), vfs);
file_savefat(get_dm(vfs).fat,
get_clustno(finfo->clustno_high, finfo->clustno_low), 1, vfs);
return 1;
}
int mkfile(char *name, vfs_t *vfs) {
char s[12];
int i, j;
struct FAT_FILEINFO *finfo = Get_dictaddr(name, vfs);
if (finfo == NULL) {
return 0;
}
int max = get_directory_max(finfo, vfs);
char *path = name;
for (i = strlen(name); i >= 0; i--) {
if (name[i] == '/' || name[i] == '\\') {
name += i + 1;
break;
}
}
for (j = 0; j != 12; j++) {
s[j] = ' ';
}
j = 0;
for (i = 0; name[i] != 0; i++) {
if (j >= 11) {
return;
}
if (name[i] == '.' && j <= 8) {
j = 8;
} else {
s[j] = name[i];
if ('a' <= s[j] && s[j] <= 'z') {
s[j] -= 0x20;
}
j++;
}
}
for (i = 0;; i++) {
if (finfo[i].name[0] == 0x00 || finfo[i].name[0] == 0xe5) {
finfo = finfo + i;
break;
}
if (i >= max && finfo != get_dm(vfs).root_directory) {
for (int j = 1; FindForCount(j, get_dm(vfs).directory_list) != NULL;
j++) {
struct List *l = FindForCount(j, get_dm(vfs).directory_list);
if ((struct FAT_FILEINFO *)l->val == finfo) {
max += get_dm(vfs).ClustnoBytes / 32;
FindForCount(j, get_dm(vfs).directory_max_list)->val = max;
struct FAT_FILEINFO *finfo_ =
(struct FAT_FILEINFO *)realloc((void *)finfo, max * 32);
if (get_now_dir(vfs) == finfo) {
get_now_dir(vfs) = finfo_;
}
finfo = finfo_;
l->val = finfo;
break;
}
}
int end = clustno_end(get_dm(vfs).type), last;
for (int j = get_clustno(finfo->clustno_high, finfo->clustno_low);;
j = get_dm(vfs).fat[j]) {
if (get_dm(vfs).fat[j] == end) {
last = j;
break;
}
}
for (int j = 0; j != get_dm(vfs).FatMaxTerms; j++) {
if (!get_dm(vfs).fat[j]) {
get_dm(vfs).fat[last] = j;
get_dm(vfs).fat[j] = end;
get_dm(vfs).FatClustnoFlags[j] = true;
break;
}
}
i--;
}
}
for (i = 0; i != 8; i++) {
finfo->name[i] = s[i];
}
for (i = 8; i != 11; i++) {
finfo->ext[i - 8] = s[i];
}
finfo->type = 0x20;
for (int i = 0; i != get_dm(vfs).FatMaxTerms; i++) {
if (!get_dm(vfs).fat[i]) {
finfo->clustno_low = i & 0xffff;
finfo->clustno_high = i >> 16;
int end = clustno_end(get_dm(vfs).type);
get_dm(vfs).fat[i] = end;
get_dm(vfs).FatClustnoFlags[i] = true;
break;
}
}
finfo->reserve = 0;
finfo->update_time = get_fat_time(get_hour(), get_min());
finfo->update_date =
get_fat_date(get_year(), get_mon(), get_day_of_month());
finfo->size = 0;
file_saveinfo(Get_dictaddr(path, vfs), vfs);
file_savefat(get_dm(vfs).fat,
get_clustno(finfo->clustno_high, finfo->clustno_low), 1, vfs);
return 1;
}
int changedict(char *dictname, vfs_t *vfs) {
// cd命令的依赖函数
strtoupper(dictname);
if (strcmp(dictname, "/") == 0) {
while (vfs->path->ctl->all != 0) {
kfree(FindForCount(vfs->path->ctl->all, vfs->path)->val);
DeleteVal(vfs->path->ctl->all, vfs->path);
}
get_now_dir(vfs) = get_dm(vfs).root_directory;
return 1;
}
struct FAT_FILEINFO *finfo = dict_search(
dictname, get_now_dir(vfs), get_directory_max(get_now_dir(vfs), vfs));
// 找文件夹
if (finfo == 0) {
// 没找到
return 0;
}
if (get_clustno(finfo->clustno_high, finfo->clustno_low) == 0) {
// 根目录
while (vfs->path->ctl->all != 0) {
free(FindForCount(vfs->path->ctl->all, vfs->path)->val);
DeleteVal(vfs->path->ctl->all, vfs->path);
}
get_now_dir(vfs) = get_dm(vfs).root_directory;
return 1;
}
//..进行特殊的处理
//.不进行处理
// 其他按照下面的方式处理
if (strcmp(dictname, "..") != 0 && strcmp(dictname, ".") != 0) {
char *dict = kmalloc(255);
strcpy(dict, dictname);
AddVal(dict, vfs->path);
}
if (strcmp(dictname, "..") == 0) {
kfree(FindForCount(vfs->path->ctl->all, vfs->path)->val);
DeleteVal(vfs->path->ctl->all, vfs->path);
}
for (int count = 1;
FindForCount(count, get_dm(vfs).directory_clustno_list) != NULL;
count++) {
struct List *list = FindForCount(count, get_dm(vfs).directory_clustno_list);
if (get_clustno(finfo->clustno_high, finfo->clustno_low) == list->val) {
list = FindForCount(count, get_dm(vfs).directory_list);
get_now_dir(vfs) = (struct FAT_FILEINFO *)list->val;
break;
}
}
return 1;
}
int rename(char *src_name, char *dst_name, vfs_t *vfs) {
strtoupper(src_name);
strtoupper(dst_name);
char name[9], ext[4];
int i;
memclean(name, 9);
memclean(ext, 4);
for (i = 0; dst_name[i] != '.'; i++) {
name[i] = dst_name[i];
}
i++;
for (int j = 0; i != strlen(dst_name); i++, j++) {
ext[j] = dst_name[i];
}
struct FAT_FILEINFO *finfo = Get_File_Address(src_name, vfs);
if (finfo == 0 || finfo->type == 0x01 || finfo->type == 0x04) {
return 0;
}
memset((void *)finfo->name, ' ', 11);
for (i = 0; i != strlen(name); i++) {
finfo->name[i] = name[i];
}
for (i = 0; i != strlen(ext); i++) {
finfo->ext[i] = ext[i];
}
file_saveinfo(Get_dictaddr(src_name, vfs), vfs);
return 1;
}
int format(char drive) {
// A,B盘——软盘
// C盘——IDE/SATA硬盘主分区
// D,E,F...盘——IDE/USB/SATA存储介质/分区/虚拟磁盘
FILE *fp = fopen("/boot.bin", "r"); // or \boot.bin
FILE *fp_32 = fopen("/boot32.bin", "r");
if (fp == 0 || fp_32 == 0) {
return 0;
}
void *read_in = kmalloc(512);
if (!(drive - 'A')) {
fread(read_in, fp->fileSize, 1, fp);
write_floppy_for_ths(0, 0, 1, read_in, 1);
unsigned int *fat = (unsigned int *)kmalloc(9 * 512);
fat[0] = 0x00fffff0;
write_floppy_for_ths(0, 0, 2, (unsigned char *)fat, 9);
write_floppy_for_ths(0, 0, 11, (unsigned char *)fat, 9);
kfree((void *)fat);
void *null_sec = kmalloc(512);
for (int i = 0; i < 224 * 32 / 512; i++) {
int t, h, s;
block2hts(19 + i, &t, &h, &s);
write_floppy_for_ths(t, h, s, null_sec, 1);
}
kfree(null_sec);
} else if (drive != 'B') {
if (!DiskReady(drive)) {
return 0;
}
if (disk_Size(drive) <= 2097152) { // 2MB及以下 fat12
fread(read_in, fp->fileSize, 1, fp);
*(unsigned char *)(&((unsigned char *)read_in)[BPB_SecPerClus]) = 1;
*(unsigned short *)(&((unsigned char *)read_in)[BPB_RootEntCnt]) = 224;
*(unsigned short *)(&((unsigned char *)read_in)[BPB_TotSec16]) =
disk_Size(drive) / 512;
*(unsigned short *)(&((unsigned char *)read_in)[BPB_TotSec32]) = 0;
unsigned short fatsz = (disk_Size(drive) - 1) / 512 * 3 / 2 / 512 + 1;
*(unsigned short *)(&((unsigned char *)read_in)[BPB_FATSz16]) = fatsz;
*(unsigned char *)(&((unsigned char *)read_in)[BS_DrvNum]) =
drive - 'C' + 0x80;
memcpy((void *)&((unsigned char *)read_in)[BS_FileSysType],
(void *)"FAT12 ", 8);
srand(time());
*(unsigned int *)(&((unsigned char *)read_in)[BS_VolD]) = rand();
memcpy((void *)&((unsigned char *)read_in)[BS_VolLab],
(void *)"POWERINTDOS", 11);
Disk_Write(0, 1, read_in, drive);
unsigned int *fat = (unsigned int *)kmalloc(fatsz * 512);
fat[0] = 0x00fffff0;
Disk_Write(1, fatsz, (void *)fat, drive);
Disk_Write(1 + fatsz, fatsz, (void *)fat, drive);
kfree((void *)fat);
void *null_sec = kmalloc(512);
memclean((char *)null_sec, 512);
for (int i = 0; i != 224 * 32 / 512; i++) {
Disk_Write(1 + fatsz * 2 + i, 1, null_sec, drive);
}
kfree(null_sec);
// page_free((void*)info, 256 * sizeof(short));
} else if (disk_Size(drive) > 2097152 &&
disk_Size(drive) <= 2147483648) { // 2MB~2GB fat16
fread(read_in, fp->fileSize, 1, fp);
unsigned int clustno_size =
((disk_Size(drive) - 1) / 65536 + 512) / 512 * 512;
*(unsigned char *)(&((unsigned char *)read_in)[BPB_SecPerClus]) =
clustno_size / 512;
*(unsigned short *)(&((unsigned char *)read_in)[BPB_RootEntCnt]) =
14 * clustno_size / 32;
if (disk_Size(drive) / 512 > 65535) {
*(unsigned short *)(&((unsigned char *)read_in)[BPB_TotSec16]) = 0;
} else {
*(unsigned short *)(&((unsigned char *)read_in)[BPB_TotSec16]) =
disk_Size(drive) / 512;
}
*(unsigned int *)(&((unsigned char *)read_in)[BPB_TotSec32]) =
disk_Size(drive) / 512;
unsigned short fatsz =
(disk_Size(drive) - 1) / clustno_size * 2 / 512 + 1;
*(unsigned short *)(&((unsigned char *)read_in)[BPB_FATSz16]) = fatsz;
*(unsigned char *)(&((unsigned char *)read_in)[BS_DrvNum]) =
drive - 'C' + 0x80;
memcpy((void *)&((unsigned char *)read_in)[BS_FileSysType],
(void *)"FAT16 ", 8);
srand(time());
*(unsigned int *)(&((unsigned char *)read_in)[BS_VolD]) = rand();
memcpy((void *)&((unsigned char *)read_in)[BS_VolLab],
(void *)"POWERINTDOS", 11);
Disk_Write(0, 1, read_in, drive);
unsigned short *fat = (unsigned short *)kmalloc(fatsz * 512);
fat[0] = 0xfff0;
fat[1] = 0xffff;
Disk_Write(1, fatsz, (void *)fat, drive);
Disk_Write(1 + fatsz, fatsz, (void *)fat, drive);
kfree((void *)fat);
void *null_sec = kmalloc(512);
memclean((char *)null_sec, 512);
for (int i = 0; i < 14 * clustno_size / 512; i++) {
Disk_Write(1 + fatsz * 2 + i, 1, null_sec, drive);
}
kfree(null_sec);
} else if (disk_Size(drive) > 2147483648) { // 2GB以上 fat32
fread(read_in, fp_32->fileSize, 1, fp_32);
unsigned int clustno_size =
(disk_Size(drive) - 1) / 268435456 * 512 + 512;
*(unsigned short *)(&((unsigned char *)read_in)[BPB_RsvdSecCnt]) = 1;
*(unsigned char *)(&((unsigned char *)read_in)[BPB_SecPerClus]) =
clustno_size / 512;
*(unsigned short *)(&((unsigned char *)read_in)[BPB_RootEntCnt]) = 0;
*(unsigned short *)(&((unsigned char *)read_in)[BPB_TotSec16]) = 0;
*(unsigned int *)(&((unsigned char *)read_in)[BPB_TotSec32]) =
disk_Size(drive) / 512;
unsigned int fatsz = (disk_Size(drive) - 1) / clustno_size * 4 / 512 + 1;
*(unsigned short *)(&((unsigned char *)read_in)[BPB_FATSz16]) = 0;
*(unsigned int *)(&((unsigned char *)read_in)[BPB_FATSz32]) = fatsz;
*(unsigned short *)(&((unsigned char *)read_in)[BPB_ExtFlags]) = 0;
*(unsigned short *)(&((unsigned char *)read_in)[BPB_FSVer]) = 0;
*(unsigned int *)(&((unsigned char *)read_in)[BPB_RootClus]) = 2;
*(unsigned short *)(&((unsigned char *)read_in)[BPB_FSInfo]) = 0;
*(unsigned short *)(&((unsigned char *)read_in)[BPB_BkBootSec]) = 0;
*(unsigned long long *)(&((unsigned char *)read_in)[BPB_Reserved]) = 0;
*(unsigned char *)(&(
(unsigned char *)read_in)[BS_DrvNum + BPB_Fat32ExtByts]) =
drive - 'C' + 0x80;
*(unsigned char *)(&(
(unsigned char *)read_in)[BS_Reserved1 + BPB_Fat32ExtByts]) = 0;
*(unsigned char *)(&(
(unsigned char *)read_in)[BS_BootSig + BPB_Fat32ExtByts]) = 0x29;
memcpy((void *)&(
(unsigned char *)read_in)[BS_FileSysType + BPB_Fat32ExtByts],
(void *)"FAT32 ", 8);
srand(time());
*(unsigned int *)(&(
(unsigned char *)read_in)[BS_VolD + BPB_Fat32ExtByts]) = rand();
memcpy((void *)&((unsigned char *)read_in)[BS_VolLab + BPB_Fat32ExtByts],
(void *)"POWERINTDOS", 11);
Disk_Write(0, 1, read_in, drive);
unsigned int *fat = (unsigned int *)kmalloc(fatsz * 512);
fat[0] = 0xffffff0;
fat[1] = 0xfffffff;
fat[2] = 0xfffffff;
Disk_Write(1, fatsz, (void *)fat, drive);
Disk_Write(1 + fatsz, fatsz, (void *)fat, drive);
kfree((void *)fat);
void *null_sec = kmalloc(512);
memlean((char *)null_sec, 512);
Disk_Write(1 + fatsz * 2, 1, null_sec, drive);
kfree(null_sec);
}
}
kfree(read_in);
fclose(fp);
fclose(fp_32);
return 1;
}
int attrib(char *filename, ftype type, struct vfs_t *vfs) {
struct FAT_FILEINFO *finfo = Get_File_Address(filename, vfs);
if (finfo == 0) {
return 0;
}
if (type == FLE)
finfo->type = 0x20;
else if (type == RDO)
finfo->type = 0x01;
else if (type == HID)
finfo->type = 0x02;
else if (type == SYS)
finfo->type = 0x04;
else
return 0;
file_saveinfo(Get_dictaddr(filename, vfs), vfs);
return 1;
}
void Fat_CopyCache(struct vfs_t *dest, struct vfs_t *src) {
dest->cache = kmalloc(sizeof(fat_cache));
memcpy(dest->cache, src->cache, sizeof(fat_cache));
}
bool Fat_cd(struct vfs_t *vfs, char *dictName) {
return changedict(dictName, vfs);
}
bool Fat_ReadFile(struct vfs_t *vfs, char *path, char *buffer) {
struct FAT_FILEINFO *finfo;
finfo = Get_File_Address(path, vfs);
if (finfo == 0) {
return 0;
} else {
file_loadfile(get_clustno(finfo->clustno_high, finfo->clustno_low),
finfo->size, buffer, get_dm(vfs).fat, vfs);
return 1;
}
}
bool Fat_WriteFile(struct vfs_t *vfs, char *path, char *buffer, int size) {
struct FAT_FILEINFO *finfo = Get_File_Address(path, vfs);
file_savefile(get_clustno(finfo->clustno_high, finfo->clustno_low), size,
buffer, get_dm(vfs).fat, get_dm(vfs).FatClustnoFlags, vfs);
finfo->size = size;
file_saveinfo(Get_dictaddr(path, vfs), vfs);
}
List *Fat_ListFile(struct vfs_t *vfs, char *dictpath) {
struct FAT_FILEINFO *finfo = Get_dictaddr(dictpath, vfs);
if(finfo == NULL) {
return NULL;
}
List *result = NewList();
char s[30];
for (int i = 0; i != 30; i++) {
s[i] = 0;
}
for (int i = 0; i < get_directory_max(finfo, vfs); i++) {
if (finfo[i].name[0] == 0x00) {
break;
}
if (finfo[i].name[0] != 0xe5) {
if ((finfo[i].type & 0x18) == 0 || finfo[i].type == 0x10) {
for (int j = 0; j < 8; j++) {
s[j] = finfo[i].name[j];
}
s[8] = '.';
if (finfo[i].ext[0] == ' ') {
s[8] = 0;
} else {
s[9] = finfo[i].ext[0];
s[10] = finfo[i].ext[1];
s[11] = finfo[i].ext[2];
}
if (s[0] != '+') {
vfs_file *d = kmalloc(sizeof(vfs_file));
if (finfo[i].type == 0x10) {
d->type = DIR;
} else if (finfo[i].type == 0x20) {
d->type = FLE;
} else if (finfo[i].type == 0x01) {
d->type = RDO;
} else if (finfo[i].type == 0x02) {
d->type = HID;
} else if (finfo[i].type == 0x04) {
d->type = SYS;
}
d->year = (finfo[i].update_date & 65024) >> 9;
d->year += 1980;
d->month = (finfo[i].update_date & 480) >> 5;
d->day = finfo[i].update_date & 31;
d->hour = (finfo[i].update_time & 63488) >> 11;
d->minute = (finfo[i].update_time & 2016) >> 5;
d->size = finfo[i].size;
int q = 0;
for (int k = 0; k < 12 && s[k] != 0; ++k) {
if (s[k] != ' ') {
d->name[q++] = s[k];
}
}
d->name[q] = 0;
// printk("d->name = %s\n", d->name);
AddVal(d, result);
}
}
}
}
return result;
}
bool Fat_RenameFile(struct vfs_t *vfs, char *filename, char *filename_of_new) {
return rename(filename, filename_of_new, vfs);
}
bool Fat_CreateFile(struct vfs_t *vfs, char *filename) {
return mkfile(filename, vfs);
}
void Fat_DeleteFs(struct vfs_t *vfs) {
kfree((void *)get_dm(vfs).ADR_DISKIMG);
kfree(get_dm(vfs).fat);
kfree(get_dm(vfs).FatClustnoFlags);
kfree(get_dm(vfs).root_directory);
DeleteList(get_dm(vfs).directory_clustno_list);
DeleteList(get_dm(vfs).directory_list);
}
bool Fat_Check(uint8_t disk_number) {
uint8_t *boot_sec = kmalloc(512);
Disk_Read(0, 1, boot_sec, disk_number);
if (memcmp(boot_sec + BS_FileSysType, "FAT12 ", 8) == 0 ||
memcmp(boot_sec + BS_FileSysType, "FAT16 ", 8) == 0 ||
memcmp(boot_sec + BS_FileSysType + BPB_Fat32ExtByts, "FAT32 ", 8) ==
0) {
kfree(boot_sec);
return true;
}
kfree(boot_sec);
return false;
}
bool Fat_DelFile(struct vfs_t *vfs, char *path) { return del(path, vfs); }
bool Fat_DelDict(struct vfs_t *vfs, char *path) { return deldir(path, vfs); }
int Fat_FileSize(struct vfs_t *vfs, char *filename) {
if (Get_File_Address(filename, vfs) == NULL) {
return -1;
}
return Get_File_Address(filename, vfs)->size;
}
bool Fat_Format(uint8_t disk_number) { return format(disk_number); }
bool Fat_CreateDict(struct vfs_t *vfs, char *filename) {
struct FAT_FILEINFO *finfo = Get_dictaddr(filename, vfs);
int last_clustno = finfo[0].clustno_low;
if (finfo == get_dm(vfs).root_directory) {
last_clustno = 0;
}
return mkdir(filename, last_clustno, vfs);
}
bool Fat_Attrib(struct vfs_t *vfs, char *filename, ftype type) {
return attrib(filename, type, vfs);
}
vfs_file *Fat_FileInfo(struct vfs_t *vfs, char *filename) {
struct FAT_FILEINFO *finfo = Get_File_Address(filename, vfs);
if (finfo == NULL) {
return (vfs_file *)NULL;
}
vfs_file *result = (vfs_file *)kmalloc(sizeof(vfs_file));
char s[30];
for (int i = 0; i != 30; i++) {
s[i] = 0;
}
for (int i = 0; i < 8; i++) {
s[i] = finfo->name[i];
}
s[8] = '.';
if (finfo->ext[0] == ' ') {
s[8] = 0;
} else {
s[9] = finfo->ext[0];
s[10] = finfo->ext[1];
s[11] = finfo->ext[2];
}
int i = 0;
for (int j = 0; i < 12 && s[i] != 0; i++) {
if (s[i] != ' ') {
result->name[j++] = s[i];
}
}
s[i] = '\0';
if (finfo->type == 0x10) {
result->type = DIR;
} else if (finfo->type == 0x20) {
result->type = FLE;
} else if (finfo->type == 0x01) {
result->type = RDO;
} else if (finfo->type == 0x02) {
result->type = HID;
} else if (finfo->type == 0x04) {
result->type = SYS;
}
result->year = (finfo->update_date & 65024) >> 9;
result->year += 1980;
result->month = (finfo->update_date & 480) >> 5;
result->day = finfo->update_date & 31;
result->hour = (finfo->update_time & 63488) >> 11;
result->minute = (finfo->update_time & 2016) >> 5;
result->size = finfo->size;
return result;
}
int mkdir(char *dictname, int last_clust, vfs_t *vfs) {
/*
dictname:目录名
last_clust:上一级目录的簇号
*/
int r = mkfile(dictname, vfs);
if (!r)
return 0;
// 三个目录项（模板）
static struct FAT_FILEINFO model[3];
// .目录项，指向自己
// ..目录项，指向上一级目录
// 空目录项（为mkfile函数提供指引）
model[0].reserve = 0;
model[1].reserve = 0;
model[2].reserve = 0;
memcpy(model[2].name, "NULL ", 11);
model[2].type = 0x20; // 文件的type属性是0x20
// 将size date time这类属性全部设置为0
model[2].size = 0;
model[2].update_date =
get_fat_date(get_year(), get_mon(), get_day_of_month());
model[2].update_time = get_fat_time(get_hour(), get_min());
for (int i = 0; i != get_dm(vfs).FatMaxTerms; i++) {
if (!get_dm(vfs).fat[i]) {
model[2].clustno_low = i;
int end = clustno_end(get_dm(vfs).type);
get_dm(vfs).fat[i] = end;
get_dm(vfs).FatClustnoFlags[i] = true;
break;
}
}
model[0].name[0] = '.';
for (int i = 1; i != 8; i++) {
model[0].name[i] = ' ';
}
for (int i = 0; i != 3; i++) {
model[0].ext[i] = ' ';
}
struct FAT_FILEINFO *finfo1 = Get_File_Address(dictname, vfs);
model[0].type = 0x10;
model[0].clustno_low = finfo1->clustno_low; // 指向自己
model[0].clustno_high = finfo1->clustno_high;
model[0].size = 0;
model[0].update_date =
get_fat_date(get_year(), get_mon(), get_day_of_month());
model[0].update_time = get_fat_time(get_hour(), get_min());
model[1].name[0] = '.';
model[1].name[1] = '.';
for (int i = 2; i != 8; i++) {
model[1].name[i] = ' ';
}
for (int i = 0; i != 3; i++) {
model[1].ext[i] = ' ';
}
model[1].clustno_low = last_clust;
model[1].size = 0;
model[1].update_date =
get_fat_date(get_year(), get_mon(), get_day_of_month());
model[1].update_time = get_fat_time(get_hour(), get_min());
model[1].type = 0x10;
Fat_WriteFile(vfs, dictname, (char *)&model[0], 32 * 3);
struct FAT_FILEINFO *finfo = Get_File_Address(dictname, vfs);
finfo->type = 0x10; // 是目录（文件夹的type属性是0x10）
finfo->size = 0;
int drive_number = vfs->disk_number;
AddVal(get_clustno(finfo->clustno_high, finfo->clustno_low),
get_dm(vfs).directory_clustno_list);
if (last_clust == 0) {
file_saveinfo(get_dm(vfs).root_directory, vfs);
} else {
for (int i = 1; FindForCount(i, get_dm(vfs).directory_clustno_list) != NULL;
i++) {
struct List *list = FindForCount(i, get_dm(vfs).directory_clustno_list);
if (list->val == last_clust) {
list = FindForCount(i, get_dm(vfs).directory_list);
struct FAT_FILEINFO *d_finfo = (struct FAT_FILEINFO *)list->val;
file_saveinfo(d_finfo, vfs);
}
}
}
file_savefat(get_dm(vfs).fat,
get_clustno(model[2].clustno_high, model[2].clustno_low), 1,
vfs);
void *directory_alloc = kmalloc(get_dm(vfs).ClustnoBytes);
Disk_Read((get_dm(vfs).FileDataAddress +
(get_clustno(finfo->clustno_high, finfo->clustno_low) - 2) *
get_dm(vfs).ClustnoBytes) /
get_dm(vfs).SectorBytes,
get_dm(vfs).ClustnoBytes / get_dm(vfs).SectorBytes, directory_alloc,
vfs->disk_number);
AddVal(directory_alloc, get_dm(vfs).directory_list);
AddVal(get_dm(vfs).ClustnoBytes / 32, get_dm(vfs).directory_max_list);
return 1;
}
void file_saveinfo(struct FAT_FILEINFO *directory, vfs_t *vfs) {
if (directory == get_dm(vfs).root_directory) {
Disk_Write(get_dm(vfs).RootDictAddress / get_dm(vfs).SectorBytes,
get_dm(vfs).RootMaxFiles * 32 / get_dm(vfs).SectorBytes,
(void *)directory, vfs->disk_number);
} else {
for (int i = 1; FindForCount(i, get_dm(vfs).directory_list) != NULL; i++) {
struct List *list = FindForCount(i, get_dm(vfs).directory_list);
if (list->val == directory) {
list = FindForCount(i, get_dm(vfs).directory_clustno_list);
int k = (int)FindForCount(i, get_dm(vfs).directory_max_list)->val * 32 /
get_dm(vfs).ClustnoBytes;
for (int j = list->val, l = 0; l != k; l++) {
Disk_Write((get_dm(vfs).FileDataAddress +
(j - 2) * get_dm(vfs).ClustnoBytes) /
get_dm(vfs).SectorBytes,
get_dm(vfs).ClustnoBytes / get_dm(vfs).SectorBytes,
(char *)directory + l * get_dm(vfs).SectorBytes,
vfs->disk_number);
j = get_dm(vfs).fat[j];
}
break;
}
}
}
}
void fat_InitFS(struct vfs_t *vfs, uint8_t disk_number) {
vfs->cache = kmalloc(sizeof(fat_cache));
void *boot_sector = kmalloc(512);
Disk_Read(0, 1, boot_sector, disk_number);
if (memcmp(boot_sector + BS_FileSysType, "FAT12 ", 8) == 0) {
get_dm(vfs).type = 12;
} else if (memcmp(boot_sector + BS_FileSysType, "FAT16 ", 8) == 0) {
get_dm(vfs).type = 16;
} else if (memcmp(boot_sector + BS_FileSysType + BPB_Fat32ExtByts, "FAT32 ",
8) == 0) {
get_dm(vfs).type = 32;
}
get_dm(vfs).SectorBytes = *(unsigned short *)(boot_sector + BPB_BytsPerSec);
get_dm(vfs).RootMaxFiles = *(unsigned short *)(boot_sector + BPB_RootEntCnt);
get_dm(vfs).ClustnoBytes = get_dm(vfs).SectorBytes *
*(unsigned char *)(boot_sector + BPB_SecPerClus);
get_dm(vfs).Fat1Address = *(unsigned short *)(boot_sector + BPB_RsvdSecCnt) *
get_dm(vfs).SectorBytes;
if (get_dm(vfs).type != 32) {
get_dm(vfs).RootDictAddress =
(*(unsigned char *)(boot_sector + BPB_NumFATs) *
*(unsigned short *)(boot_sector + BPB_FATSz16) +
*(unsigned short *)(boot_sector + BPB_RsvdSecCnt)) *
get_dm(vfs).SectorBytes;
get_dm(vfs).FileDataAddress =
get_dm(vfs).RootDictAddress + get_dm(vfs).RootMaxFiles * 32;
if (*(unsigned short *)(boot_sector + BPB_TotSec16) != 0) {
get_dm(vfs).imgTotalSize =
*(unsigned short *)(boot_sector + BPB_TotSec16) *
get_dm(vfs).SectorBytes;
} else {
get_dm(vfs).imgTotalSize = *(unsigned int *)(boot_sector + BPB_TotSec32) *
get_dm(vfs).SectorBytes;
}
get_dm(vfs).Fat2Address = get_dm(vfs).Fat1Address +
*(unsigned short *)(boot_sector + BPB_FATSz16) *
get_dm(vfs).SectorBytes;
} else {
get_dm(vfs).FileDataAddress =
(*(unsigned char *)(boot_sector + BPB_NumFATs) *
*(unsigned int *)(boot_sector + BPB_FATSz32) +
*(unsigned short *)(boot_sector + BPB_RsvdSecCnt)) *
get_dm(vfs).SectorBytes;
get_dm(vfs).RootDictAddress =
get_dm(vfs).FileDataAddress +
(*(unsigned int *)(boot_sector + BPB_RootClus) - 2) *
get_dm(vfs).ClustnoBytes;
get_dm(vfs).imgTotalSize =
*(unsigned int *)(boot_sector + BPB_TotSec32) * get_dm(vfs).SectorBytes;
get_dm(vfs).Fat2Address =
get_dm(vfs).Fat1Address +
*(unsigned int *)(boot_sector + BPB_FATSz32) * get_dm(vfs).SectorBytes;
get_dm(vfs).RootMaxFiles = get_dm(vfs).ClustnoBytes / 32;
}
get_dm(vfs).FatMaxTerms =
(get_dm(vfs).Fat2Address - get_dm(vfs).Fat1Address) * 8 /
get_dm(vfs).type;
uint32_t sec = (get_dm(vfs).RootDictAddress + get_dm(vfs).RootMaxFiles * 32) /
get_dm(vfs).SectorBytes;
get_dm(vfs).ADR_DISKIMG = (unsigned int)kmalloc(get_dm(vfs).RootDictAddress +
get_dm(vfs).RootMaxFiles * 32);
Disk_Read(0, sec, (void *)get_dm(vfs).ADR_DISKIMG, disk_number);
get_dm(vfs).fat = kmalloc(get_dm(vfs).FatMaxTerms * sizeof(int));
get_dm(vfs).FatClustnoFlags = kmalloc(get_dm(vfs).FatMaxTerms * sizeof(char));
read_fat((unsigned char *)(get_dm(vfs).ADR_DISKIMG +
(unsigned int)get_dm(vfs).Fat1Address),
get_dm(vfs).fat, get_dm(vfs).FatClustnoFlags,
get_dm(vfs).FatMaxTerms, get_dm(vfs).type);
get_dm(vfs).root_directory =
(struct FAT_FILEINFO *)kmalloc(get_dm(vfs).RootMaxFiles * 32);
memcpy((void *)get_dm(vfs).root_directory,
(void *)get_dm(vfs).ADR_DISKIMG + get_dm(vfs).RootDictAddress,
get_dm(vfs).RootMaxFiles * 32);
get_dm(vfs).directory_list = (struct List *)NewList();
get_dm(vfs).directory_clustno_list = (struct List *)NewList();
get_dm(vfs).directory_max_list = (struct List *)NewList();
struct FAT_FILEINFO *finfo = get_dm(vfs).root_directory;
for (int i = 0; i != get_dm(vfs).RootMaxFiles; i++) {
if (finfo[i].type == 0x10 && finfo[i].name[0] != 0xe5) {
AddVal(get_clustno(finfo[i].clustno_high, finfo[i].clustno_low),
(struct List *)get_dm(vfs).directory_clustno_list);
int end = clustno_end(get_dm(vfs).type), k = 1;
for (int j = get_clustno(finfo[i].clustno_high, finfo[i].clustno_low);
get_dm(vfs).fat[j] != end; j = get_dm(vfs).fat[j], k++)
;
void *directory_alloc = kmalloc(k * get_dm(vfs).ClustnoBytes);
for (int j = get_clustno(finfo[i].clustno_high, finfo[i].clustno_low),
l = 0;
l != k; l++) {
uint32_t sec1 =
(get_dm(vfs).FileDataAddress + (j - 2) * get_dm(vfs).ClustnoBytes) /
get_dm(vfs).SectorBytes;
Disk_Read(sec1, get_dm(vfs).ClustnoBytes / get_dm(vfs).SectorBytes,
(char *)directory_alloc + l * get_dm(vfs).SectorBytes,
disk_number);
j = get_dm(vfs).fat[j];
}
AddVal((int)directory_alloc, (struct List *)get_dm(vfs).directory_list);
AddVal(k * get_dm(vfs).ClustnoBytes / 32,
(struct List *)get_dm(vfs).directory_max_list);
}
if (finfo[i].name[0] == 0) {
break;
}
}
for (int i = 1;
FindForCount(i, (struct List *)get_dm(vfs).directory_list) != NULL;
i++) {
struct List *list =
FindForCount(i, (struct List *)get_dm(vfs).directory_list);
finfo = (struct FAT_FILEINFO *)list->val;
for (int j = 0; j != get_directory_max(finfo, vfs); j++) {
if (finfo[j].type == 0x10 && finfo[j].name[0] != 0xe5 &&
strncmp(".", (char *)finfo[j].name, 1) != 0 &&
strncmp("..", (char *)finfo[j].name, 2) != 0) {
AddVal(get_clustno(finfo[j].clustno_high, finfo[j].clustno_low),
(struct List *)get_dm(vfs).directory_clustno_list);
int end = clustno_end(get_dm(vfs).type), k = 1;
for (int m = get_clustno(finfo[j].clustno_high, finfo[j].clustno_low);
get_dm(vfs).fat[m] != end; m = get_dm(vfs).fat[m], k++)
;
void *directory_alloc = kmalloc(k * get_dm(vfs).ClustnoBytes);
for (int m = get_clustno(finfo[j].clustno_high, finfo[j].clustno_low),
l = 0;
l != k; l++) {
uint32_t sec1 = (get_dm(vfs).FileDataAddress +
(m - 2) * get_dm(vfs).ClustnoBytes) /
get_dm(vfs).SectorBytes;
Disk_Read(sec1, get_dm(vfs).ClustnoBytes / get_dm(vfs).SectorBytes,
(char *)directory_alloc + l * get_dm(vfs).SectorBytes,
disk_number);
m = get_dm(vfs).fat[m];
}
AddVal((int)directory_alloc, (struct List *)get_dm(vfs).directory_list);
AddVal(k * get_dm(vfs).ClustnoBytes / 32,
(struct List *)get_dm(vfs).directory_max_list);
}
if (finfo[j].name[0] == 0) {
break;
}
}
}
kfree(boot_sector);
}
void Register_fat_fileSys() {
vfs_t fs;
fs.flag = 1;
fs.cache = NULL;
strcpy(fs.FSName, "FAT");
fs.CopyCache = Fat_CopyCache;
fs.Format = Fat_Format;
fs.CreateFile = Fat_CreateFile;
fs.CreateDict = Fat_CreateDict;
fs.DelDict = Fat_DelDict;
fs.DelFile = Fat_DelFile;
fs.ReadFile = Fat_ReadFile;
fs.WriteFile = Fat_WriteFile;
fs.DeleteFs = Fat_DeleteFs;
fs.cd = Fat_cd;
fs.FileSize = Fat_FileSize;
fs.Check = Fat_Check;
fs.ListFile = Fat_ListFile;
fs.InitFs = fat_InitFS;
fs.RenameFile = Fat_RenameFile;
fs.Attrib = Fat_Attrib;
fs.FileInfo = Fat_FileInfo;
vfs_register_fs(fs);
}
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