backported more fixes from 256boss

[bootcensus] / src / fs.h

diff --git a/src/fs.h b/src/fs.h
new file mode 100644 (file)
index 0000000..f05f29a
--- /dev/null
+++ b/src/fs.h
@@ -0,0 +1,125 @@
+/*
+pcboot - bootable PC demo/game kernel
+Copyright (C) 2018-2019  John Tsiombikas <nuclear@member.fsf.org>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY, without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+#ifndef FS_H_
+#define FS_H_
+
+#include <inttypes.h>
+
+/* device ids for virtual filesystems */
+enum {
+       DEV_FLOPPY0             = 0,
+       DEV_FLOPPY1             = 1,
+       DEV_HDD0                = 0x80,
+       DEV_HDD1                = 0x81,
+       DEV_MEMDISK             = 0x10000
+};
+
+enum {
+       FSTYPE_MEM,
+       FSTYPE_FAT,
+
+       NUM_FSTYPES
+};
+
+enum { FSNODE_FILE, FSNODE_DIR };
+
+enum { FSSEEK_SET, FSSEEK_CUR, FSSEEK_END };
+
+enum {
+       FSO_CREATE      = 1,
+       FSO_DIR         = 2,
+       FSO_EXCL        = 4
+};
+
+struct filesys;
+struct fs_node;
+struct fs_dirent;
+
+struct fs_operations {
+       void (*destroy)(struct filesys *fs);
+
+       struct fs_node *(*open)(struct filesys *fs, const char *path, unsigned int flags);
+       void (*close)(struct fs_node *node);
+
+       long (*fsize)(struct fs_node *node);
+       int (*seek)(struct fs_node *node, int offs, int whence);
+       long (*tell)(struct fs_node *node);
+       int (*read)(struct fs_node *node, void *buf, int sz);
+       int (*write)(struct fs_node *node, void *buf, int sz);
+
+       int (*rewinddir)(struct fs_node *node);
+       struct fs_dirent *(*readdir)(struct fs_node *node);
+
+       int (*rename)(struct fs_node *node, const char *name);
+       int (*remove)(struct fs_node *node);
+};
+
+struct filesys {
+       int type;
+       char *name;
+       struct fs_operations *fsop;
+       void *data;
+};
+
+struct fs_node {
+       struct filesys *fs;
+       int type;
+       void *data;
+
+       struct filesys *mnt;
+};
+
+struct fs_dirent {
+       char *name;
+       void *data;
+       int type;
+       long fsize;
+};
+
+struct filesys *rootfs;
+struct fs_node *cwdnode;       /* current working directory node */
+
+struct filesys *fs_mount(int dev, uint64_t start, uint64_t size, struct fs_node *parent);
+
+int fs_chdir(const char *path);
+char *fs_getcwd(void);
+
+struct fs_node *fs_open(const char *path, unsigned int flags);
+int fs_close(struct fs_node *node);
+
+int fs_rename(struct fs_node *node, const char *name);
+int fs_remove(struct fs_node *node);
+
+long fs_filesize(struct fs_node *node);
+int fs_seek(struct fs_node *node, int offs, int whence);
+long fs_tell(struct fs_node *node);
+int fs_read(struct fs_node *node, void *buf, int sz);
+int fs_write(struct fs_node *node, void *buf, int sz);
+
+int fs_rewinddir(struct fs_node *node);
+struct fs_dirent *fs_readdir(struct fs_node *node);
+
+/* fs utility functions */
+char *fs_path_skipsep(char *s);
+
+/* copies the current name into the namebuf, and returns a pointer to the
+ * start of the next path component.
+ */
+char *fs_path_next(char *s, char *namebuf, int bufsz);
+
+#endif /* FS_H_ */