1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
102 lines
3.6 KiB
C
102 lines
3.6 KiB
C
#ifndef _ZFTAPE_RW_H
|
|
#define _ZFTAPE_RW_H
|
|
|
|
/*
|
|
* Copyright (C) 1996, 1997 Claus-Justus Heine.
|
|
|
|
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 2, 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; see the file COPYING. If not, write to
|
|
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
|
|
*
|
|
* $Source: /homes/cvs/ftape-stacked/ftape/zftape/zftape-rw.h,v $
|
|
* $Revision: 1.2 $
|
|
* $Date: 1997/10/05 19:19:09 $
|
|
*
|
|
* This file contains the definitions for the read and write
|
|
* functions for the QIC-117 floppy-tape driver for Linux.
|
|
*
|
|
*/
|
|
|
|
#include <linux/config.h> /* for CONFIG_ZFT_DFLT_BLK_SZ */
|
|
#include "../zftape/zftape-buffers.h"
|
|
|
|
#define SEGMENTS_PER_TAPE (ft_segments_per_track * ft_tracks_per_tape)
|
|
|
|
/* QIC-113 Rev. G says that `a maximum of 63488 raw bytes may be
|
|
* compressed into a single frame'.
|
|
* Maybe we should stick to 32kb to make it more `beautiful'
|
|
*/
|
|
#define ZFT_MAX_BLK_SZ (62*1024) /* bytes */
|
|
#if !defined(CONFIG_ZFT_DFLT_BLK_SZ)
|
|
# define CONFIG_ZFT_DFLT_BLK_SZ (10*1024) /* bytes, default of gnu tar */
|
|
#elif CONFIG_ZFT_DFLT_BLK_SZ == 0
|
|
# undef CONFIG_ZFT_DFLT_BLK_SZ
|
|
# define CONFIG_ZFT_DFLT_BLK_SZ 1
|
|
#elif (CONFIG_ZFT_DFLT_BLK_SZ % 1024) != 0
|
|
# error CONFIG_ZFT_DFLT_BLK_SZ must be 1 or a multiple of 1024
|
|
#endif
|
|
/* The *optional* compression routines need some overhead per tape
|
|
* block for their purposes. Instead of asking the actual compression
|
|
* implementation how much it needs, we restrict this overhead to be
|
|
* maximal of ZFT_CMPT_OVERHEAD size. We need this for EOT
|
|
* conditions. The tape is assumed to be logical at EOT when the
|
|
* distance from the physical EOT is less than
|
|
* one tape block + ZFT_CMPR_OVERHEAD
|
|
*/
|
|
#define ZFT_CMPR_OVERHEAD 16 /* bytes */
|
|
|
|
typedef enum
|
|
{
|
|
zft_idle = 0,
|
|
zft_reading,
|
|
zft_writing,
|
|
} zft_status_enum;
|
|
|
|
typedef struct /* all values measured in bytes */
|
|
{
|
|
int seg_pos; /* segment currently positioned at */
|
|
int seg_byte_pos; /* offset in current segment */
|
|
__s64 tape_pos; /* real offset from BOT */
|
|
__s64 volume_pos; /* pos. in uncompressed data stream in
|
|
* current volume
|
|
*/
|
|
} zft_position;
|
|
|
|
extern zft_position zft_pos;
|
|
extern __u8 *zft_deblock_buf;
|
|
extern __u8 *zft_hseg_buf;
|
|
extern int zft_deblock_segment;
|
|
extern zft_status_enum zft_io_state;
|
|
extern int zft_header_changed;
|
|
extern int zft_qic113; /* conform to old specs. and old zftape */
|
|
extern int zft_use_compression;
|
|
extern unsigned int zft_blk_sz;
|
|
extern __s64 zft_capacity;
|
|
extern unsigned int zft_written_segments;
|
|
extern int zft_label_changed;
|
|
|
|
/* zftape-rw.c exported functions
|
|
*/
|
|
extern unsigned int zft_get_seg_sz(unsigned int segment);
|
|
extern void zft_set_flags(unsigned int minor_unit);
|
|
extern int zft_calc_seg_byte_coord(int *seg_byte_pos, __s64 tape_pos);
|
|
extern __s64 zft_calc_tape_pos(int segment);
|
|
extern __s64 zft_get_capacity(void);
|
|
extern void zft_update_label(__u8 *buffer);
|
|
extern int zft_erase(void);
|
|
extern int zft_verify_write_segments(unsigned int segment,
|
|
__u8 *data, size_t size, __u8 *buffer);
|
|
extern unsigned int zft_get_time(void);
|
|
#endif /* _ZFTAPE_RW_H */
|
|
|