void fs_init(FileSystem *fs) {
fs->stor = (Storage *) malloc(sizeof(Storage));
fs->stor->c = malloc(sizeof(char) * NUM_SECTORS() * 256);
fs->freelist = freelist_new(fs);
fs->cur = fs_load_inode(fs, ROOT_PAGE_NUM());
fs->ninode = 0;
}
ISODirectoryRecord *findEntryInCache(const char *name, int nameLen) {
int i;
CdRMode rmode = { 16, 0, CdSect2048, 0 };
ISODirectoryRecord *entry;
for (i = 0; i < NUM_SECTORS(cachedDirSize); i++) {
entry = (ISODirectoryRecord *)cacheBuf;
if (i != cachedDirOfs) {
if (cdReadSectors(cachedDirLba + i, 1, cacheBuf, &rmode) < 0)
return NULL;
cachedDirOfs = i;
}
while (entry->len_dr && ((uint8 *)entry < cacheBuf + SECTOR_SIZE)) {
if ((entry->len_fi > 2) && (entry->name[entry->len_fi - 2] == ';') && (entry->name[entry->len_fi - 1] == '1')) {
if ((nameLen == entry->len_fi - 2) && (strnicmp(name, entry->name, entry->len_fi - 2) == 0))
return entry;
} else {
if ((nameLen == entry->len_fi) && (strnicmp(name, entry->name, entry->len_fi) == 0))
return entry;
}
entry = (ISODirectoryRecord *)( (uint8 *)entry + entry->len_dr );
}
}
return NULL;
}
Freelist* freelist_new(FileSystem *fs) {
Freelist *freelist = NULL;
int sec = 0;
int islot = 0;
freelist = (Freelist *) malloc(sizeof(Freelist));
freelist->fs = fs;
freelist->max_page_num = -1;
freelist->nslot = 0;
for (sec = 0; sec < NUM_SECTORS(); ++sec) {
if (storage_readchar(fs->stor, sec / 256, sec % 256)) {
freelist->max_page_num = sec;
} else {
freelist->nslot++;
}
}
freelist->slots = (int *) malloc(sizeof(int) * (freelist->nslot + 1));
for (sec = 0; sec < NUM_SECTORS(); ++sec) {
if (!storage_readchar(fs->stor, sec / 256, sec % 256)) {
freelist->slots[islot++] = sec;
}
}
return freelist;
}
void freelist_free(Freelist *freelist) {
if (freelist) {
int sec = 0;
for (sec = 0; sec < NUM_SECTORS(); ++sec) {
if (sec > freelist->max_page_num) {
storage_writechar(freelist->fs->stor, sec / 256, sec % 256, 0);
} else if (in_freelist(sec, freelist)) {
storage_writechar(freelist->fs->stor, sec / 256, sec % 256, 0);
} else {
storage_writechar(freelist->fs->stor, sec / 256, sec % 256, 1);
}
}
free(freelist->slots);
free(freelist);
}
}
int FREELIST_NSEC() {
return NUM_SECTORS() / 256;
}