#ifndef LBX_H_
#define LBX_H_

#include <stdio.h>

/* Errors */
enum {
	LBX_ESUCCESS,
	LBX_EMAGIC,
	LBX_EEOF,
	LBX_ERANGE,
	LBX_EFORMAT,
};
extern int lbx_errno;

struct lbx_file_ops {
	size_t (*read)(void *buf, size_t size, void *handle);
	int    (*seek)(void *handle, long offset, int whence);
	long   (*tell)(void *handle);
	int    (*eof) (void *handle);
};

struct lbx_pipe_state {
	FILE *f;
	long offset;
};

/* Default I/O operations for ordinary files. */
extern const struct lbx_file_ops lbx_default_fops;

/* I/O operations for un-seekable files (e.g. pipes). */
extern const struct lbx_file_ops lbx_pipe_fops;

/* I/O operations for LBX archive members. */
extern const struct lbx_file_ops lbx_arch_fops;

/* Opaque */
typedef struct lbx_state LBX;
typedef struct lbx_file_state LBXfile;

struct lbx_statbuf {
	const char *name;
	size_t size;
};

/* Archive operations */
LBX   *lbx_open(void *handle, const struct lbx_file_ops *fops,
                int (*destructor)(void *handle), const char *name);
LBX   *lbx_fopen(const char *);
LBX   *lbx_mopen(void *, size_t, const char *);
int    lbx_close(LBX *);
size_t lbx_numfiles(LBX *);

/* File operations */
int      lbx_stat(LBX *, size_t, struct lbx_statbuf *);

LBXfile *lbx_file_open(LBX *lbx, unsigned fileno);
size_t   lbx_file_read(LBXfile *f, void *buf, size_t n);
int      lbx_file_seek(LBXfile *f, long offset, int whence);
long     lbx_file_tell(LBXfile *f);
int      lbx_file_eof(LBXfile *f);
void     lbx_file_close(LBXfile *f);

/* Misc operations */
const char *lbx_strerror(void);

#endif