patch-2.1.66 linux/drivers/char/ftape/zftape/zftape-rw.h

• Lines: 103
• Date: Tue Nov 25 14:45:28 1997
• Orig file: v2.1.65/linux/drivers/char/ftape/zftape/zftape-rw.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.65/linux/drivers/char/ftape/zftape/zftape-rw.h linux/drivers/char/ftape/zftape/zftape-rw.h
@@ -0,0 +1,102 @@
+#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 "../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_bad_sector_map_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 */
+