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Diffstat (limited to 'drivers/char/ftape/compressor/zftape-compress.h')
-rw-r--r-- | drivers/char/ftape/compressor/zftape-compress.h | 83 |
1 files changed, 0 insertions, 83 deletions
diff --git a/drivers/char/ftape/compressor/zftape-compress.h b/drivers/char/ftape/compressor/zftape-compress.h deleted file mode 100644 index f200741e33bf..000000000000 --- a/drivers/char/ftape/compressor/zftape-compress.h +++ /dev/null | |||
@@ -1,83 +0,0 @@ | |||
1 | #ifndef _ZFTAPE_COMPRESS_H | ||
2 | #define _ZFTAPE_COMPRESS_H | ||
3 | /* | ||
4 | * Copyright (c) 1994-1997 Claus-Justus Heine | ||
5 | |||
6 | This program is free software; you can redistribute it and/or | ||
7 | modify it under the terms of the GNU General Public License as | ||
8 | published by the Free Software Foundation; either version 2, or (at | ||
9 | your option) any later version. | ||
10 | |||
11 | This program is distributed in the hope that it will be useful, but | ||
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | ||
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
14 | General Public License for more details. | ||
15 | |||
16 | You should have received a copy of the GNU General Public License | ||
17 | along with this program; see the file COPYING. If not, write to | ||
18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, | ||
19 | USA. | ||
20 | |||
21 | * | ||
22 | * $Source: /homes/cvs/ftape-stacked/ftape/compressor/zftape-compress.h,v $ | ||
23 | * $Revision: 1.1 $ | ||
24 | * $Date: 1997/10/05 19:12:32 $ | ||
25 | * | ||
26 | * This file contains macros and definitions for zftape's | ||
27 | * builtin compression code. | ||
28 | * | ||
29 | */ | ||
30 | |||
31 | #include "../zftape/zftape-buffers.h" | ||
32 | #include "../zftape/zftape-vtbl.h" | ||
33 | #include "../compressor/lzrw3.h" | ||
34 | |||
35 | /* CMPR_WRK_MEM_SIZE gives the size of the compression wrk_mem */ | ||
36 | /* I got these out of lzrw3.c */ | ||
37 | #define U(X) ((__u32) X) | ||
38 | #define SIZE_P_BYTE (U(sizeof(__u8 *))) | ||
39 | #define ALIGNMENT_FUDGE (U(16)) | ||
40 | |||
41 | #define CMPR_WRK_MEM_SIZE (U(4096)*(SIZE_P_BYTE) + ALIGNMENT_FUDGE) | ||
42 | |||
43 | /* the maximum number of bytes the size of the "compressed" data can | ||
44 | * exceed the uncompressed data. As it is quite useless to compress | ||
45 | * data twice it is sometimes the case that it is more efficient to | ||
46 | * copy a block of data but to feed it to the "compression" | ||
47 | * algorithm. In this case there are some flag bytes or the like | ||
48 | * proceding the "compressed" data. THAT MUST NOT BE THE CASE for the | ||
49 | * algorithm we use for this driver. Instead, the high bit 15 of | ||
50 | * compressed_size: | ||
51 | * | ||
52 | * compressed_size = ftape_compress() | ||
53 | * | ||
54 | * must be set in such a case. | ||
55 | * | ||
56 | * Nevertheless, it might also be as for lzrw3 that there is an | ||
57 | * "intermediate" overrun that exceeds the amount of the compressed | ||
58 | * data that is actually produced. During the algorithm we need in the | ||
59 | * worst case MAX_CMP_GROUP bytes more than the input-size. | ||
60 | */ | ||
61 | #define MAX_CMP_GROUP (2+16*2) /* from lzrw3.c */ | ||
62 | |||
63 | #define CMPR_OVERRUN MAX_CMP_GROUP /* during compression */ | ||
64 | |||
65 | /****************************************************/ | ||
66 | |||
67 | #define CMPR_BUFFER_SIZE (MAX_BLOCK_SIZE + CMPR_OVERRUN) | ||
68 | |||
69 | /* the compression map stores the byte offset compressed blocks within | ||
70 | * the current volume for catridges with format code 2,3 and 5 | ||
71 | * (and old versions of zftape) and the offset measured in kilobytes for | ||
72 | * format code 4 and 6. This gives us a possible max. size of a | ||
73 | * compressed volume of 1024*4GIG which should be enough. | ||
74 | */ | ||
75 | typedef __u32 CmprMap; | ||
76 | |||
77 | /* globals | ||
78 | */ | ||
79 | |||
80 | /* exported functions | ||
81 | */ | ||
82 | |||
83 | #endif /* _ZFTAPE_COMPRESS_H */ | ||