/*********************************************************************************************************
** Function name: __vfs_close
** Descriptions: 关闭文件
** input parameters: pid 任务 ID
** fd 文件描述符
** output parameters: NONE
** Returned value: 0 OR -1
*********************************************************************************************************/
int __vfs_close(pid_t pid, int fd)
{
int ret;
vfs_file_begin(pid);
if (point->fs->close == NULL) {
vfs_file_end(pid);
seterrno(ENOSYS);
return -1;
}
seterrno(0);
if (atomic_dec_and_test(&file->ref)) {
ret = point->fs->close(point, file);
if (ret == 0) {
mutex_lock(&info_lock[pid], 0);
info->files[fd] = NULL;
mutex_unlock(&info_lock[pid]);
vfs_file_free(file);
atomic_dec(&point->ref);
return ret;
} else {
atomic_inc(&file->ref);
}
} else {
ret = 0;
}
vfs_file_end(pid);
return ret;
}
int main(int argc, char *argv[]) {
FILE *general = fopen("../data/GENERAL.MIX", "rb");
if (!general) {
perror("Can't open GENERAL.MIX");
return 1;
}
fseek(general, 0, SEEK_END);
size_t size = ftell(general);
fseek(general, 0, SEEK_SET);
char *buf = g_malloc(size);
fread(buf, 1, size, general);
fclose(general);
vfs_file_t *fp = vfs_memfile_new(size);
vfs_file_write(buf, size, fp);
vfs_file_seek(fp, 0, VFS_SEEK_SET);
vfs_mix_archive_t *ar = vfs_mix_archive_new(fp);
printf("Archive has %u files.\n", *(guint16*)ar);
vfs_file_t *ini = vfs_mix_archive_fopen(ar, "scg01ea.ini");
vfs_file_seek(ini, 0, VFS_SEEK_END);
guint32 inisize = vfs_file_tell(ini);
vfs_file_seek(ini, 0, VFS_SEEK_SET);
char *inibuf = g_malloc0(inisize+1);
vfs_file_read(inibuf, inisize, ini);
printf(inibuf);
vfs_file_free(ini);
return 0;
};
/*********************************************************************************************************
** Function name: vfs_open
** Descriptions: 打开文件
** input parameters: path 文件路径
** oflag 标志
** mode 模式
** output parameters: NONE
** Returned value: 0 OR -1
*********************************************************************************************************/
int vfs_open(const char *path, int oflag, mode_t mode)
{
mount_point_t *point;
vfs_info_t *info;
file_t *file;
char *pathbuf;
char *filepath;
int fd;
int ret;
int pid = getpid();
pathbuf = kmalloc(PATH_BUF_LEN, GFP_KERNEL);
if (pathbuf == NULL) {
seterrno(ENOMEM);
return -1;
}
point = vfs_mount_point_lookup_ref(pathbuf, &filepath, path); /* 查找挂载点 */
if (point == NULL) {
kfree(pathbuf);
return -1;
}
mutex_lock(&info_lock[pid], 0);
info = infos[pid];
for (fd = 0; fd < info->open_max; fd++) { /* 查找一个空闲的文件描述符 */
file = info->files[fd];
if (file == NULL) {
break;
}
}
if (fd == info->open_max) { /* 没找到 */
mutex_unlock(&info_lock[pid]);
atomic_dec(&point->ref);
kfree(pathbuf);
seterrno(EMFILE);
return -1;
}
file = vfs_file_alloc(); /* 分配一个文件结构 */
if (file == NULL) {
mutex_unlock(&info_lock[pid]);
atomic_dec(&point->ref);
kfree(pathbuf);
seterrno(EMFILE);
return -1;
}
info->files[fd] = file; /* 记录下来 */
mutex_lock(&file->lock, 0); /* 锁上文件结构 */
mutex_unlock(&info_lock[pid]);
file->type = VFS_FILE_TYPE_FILE; /* 类型: 文件 */
file->flags = (oflag + 1); /* 打开标志 */
file->ctx = NULL; /* 上下文 */
file->point = point; /* 挂载点 */
if (point->fs->open == NULL) {
mutex_lock(&info_lock[pid], 0);
info->files[fd] = NULL;
mutex_unlock(&info_lock[pid]);
vfs_file_free(file);
atomic_dec(&point->ref);
kfree(pathbuf);
seterrno(ENOSYS);
return -1;
}
seterrno(0);
ret = point->fs->open(point, file, filepath, oflag, mode); /* 打开文件 */
if (ret < 0) {
mutex_lock(&info_lock[pid], 0);
info->files[fd] = NULL;
mutex_unlock(&info_lock[pid]);
vfs_file_free(file);
atomic_dec(&point->ref);
kfree(pathbuf);
return -1;
}
mutex_unlock(&file->lock);
kfree(pathbuf);
return fd; /* 返回文件描述符 */
}