/*\
 *  libLB - The LBPP support library
 *  Copyright (C) 2001   Anthony Liguori <ajl13@bellatlantic.net>
 *
 *  libLB is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  libLB 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
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
\*/

#ifndef _LB_DEVICES_H
#define _LB_DEVICES_H

#ifndef _LB_H
#error This file is not meant to be included directly
#endif

#define MAX_DEV_NAME 128

#define LB_DEV_NONE      0x00
#define LB_DEV_RANDOM    0x01
#define LB_DEV_STREAM    0x02
#define LB_DEV_READ      0x04
#define LB_DEV_WRITE     0x08
#define LB_DEV_RDONLY    (LB_DEV_READ)
#define LB_DEV_RDWR      (LB_DEV_READ | LB_DEV_WRITE)
#define LB_DEV_CHAR      (LB_DEV_STREAM)
#define LB_DEV_BLOCK     (LB_DEV_STREAM | LB_DEV_RANDOM)

typedef int (*LBDevOpen)(LBContext *, char *open, void *);
typedef void (*LBDevClose)(LBContext *, void *);

typedef int (*LBDevEOF)(LBContext *, void *);
typedef int (*LBDevLOF)(LBContext *, void *);

typedef LBString (*LBDevReadStr)(LBContext *, void *, size_t);
typedef int (*LBDevWriteStr)(LBContext *, void *, LBString);

typedef double (*LBDevReadDb)(LBContext *, void *);
typedef int (*LBDevWriteDb)(LBContext *, void *, double);

typedef LBString (*LBDevReadStrFrom)(LBContext *, void *, int, size_t);
typedef int (*LBDevWriteStrTo)(LBContext *, void *, int, LBString);

typedef double (*LBDevReadDbFrom)(LBContext *, void *, int);
typedef int (*LBDevWriteDbTo)(LBContext *, void *, int, double);

typedef struct _lb_device_class_tag
{
  char name[MAX_DEV_NAME];
} LBDeviceClass;

typedef struct _lb_device_tag
{
  char name[MAX_DEV_NAME];

  int dev_type;
  int cid;

  LBDevOpen open;
  LBDevClose close;
  LBDevEOF eof;
  LBDevLOF lof;

  // Stream functions
  LBDevReadStr read_str;
  LBDevWriteStr write_str;
  LBDevReadDb read_db;
  LBDevWriteDb write_db;

  // Random access functions
  LBDevReadStrFrom read_str_from;
  LBDevWriteStrTo write_str_to;
  LBDevReadDbFrom read_db_from;
  LBDevWriteDbTo write_db_to;
} LBDevice;

LBDevice *lb_register_dev(LBContext *cxt, char *name, char *class);
LBDevice *lb_get_dev(LBContext *cxt, char *name);

int lb_register_dev_cid(LBContext *cxt, char *name);
int lb_get_dev_cid(LBContext *cxt, char *name);

#endif