memfs header for exokernel

#ifndef _MEMFS_H_
#define _MEMFS_H_

#define MEMFS_DISKHDR_MAGIC "MemFS"
typedef struct {
    char magic[5];
    unsigned int listoffset;
    unsigned int dataoffset;
} MEMFS_DISKHDR;

typedef struct MEMFS_FILE_S {
    char name[32];
    unsigned int seekpos;
    unsigned int dataoffset;
    unsigned int datasize;
    struct MEMFS_FILE_S *next;
} MEMFS_FILE;

#define MEMFS_INVALID_FILE (0xFFFFFFFF)
#define MEMFS_READ_FAIL (0xFFFFFFFE)
#define MEMFS_WRITE_FAIL (0xFFFFFFFD)
#define MEMFS_SEEK_FAIL (0xFFFFFFFC)
#define MEMFS_SEEK_START (0xFFFFFFFB)
#define MEMFS_SEEK_END (0xFFFFFFFA)

MEMFS_FILE *memfs_open(MEMFS_DISKHDR *dh, char *fname);
MEMFS_FILE *memfs_create(MEMFS_DISKHDR *dh, char *fname);

unsigned int memfs_seek(MEMFS_DISKHDR *dh, MEMFS_FILE *f, unsigned int pos);
unsigned int memfs_read(MEMFS_DISKHDR *dh, MEMFS_FILE *f, void *data, unsigned int max);
unsigned int memfs_write(MEMFS_DISKHDR *dh, MEMFS_FILE *f, void *data, unsigned int len);

#endif