projects/linux·blob v3.13 · refs

57 lines · 1.7 KiB

1/* zconf.h -- configuration of the zlib compression library
2 * Copyright (C) 1995-1998 Jean-loup Gailly.
3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */
5
6/* @(#) $Id$ */
7
8#ifndef _ZCONF_H
9#define _ZCONF_H
10
11/* The memory requirements for deflate are (in bytes):
12 (1 << (windowBits+2)) + (1 << (memLevel+9))
13 that is: 128K for windowBits=15 + 128K for memLevel = 8 (default values)
14 plus a few kilobytes for small objects. For example, if you want to reduce
15 the default memory requirements from 256K to 128K, compile with
16 make CFLAGS="-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7"
17 Of course this will generally degrade compression (there's no free lunch).
18
19 The memory requirements for inflate are (in bytes) 1 << windowBits
20 that is, 32K for windowBits=15 (default value) plus a few kilobytes
21 for small objects.
22*/
23
24/* Maximum value for memLevel in deflateInit2 */
25#ifndef MAX_MEM_LEVEL
26# define MAX_MEM_LEVEL 8
27#endif
28
29/* Maximum value for windowBits in deflateInit2 and inflateInit2.
30 * WARNING: reducing MAX_WBITS makes minigzip unable to extract .gz files
31 * created by gzip. (Files created by minigzip can still be extracted by
32 * gzip.)
33 */
34#ifndef MAX_WBITS
35# define MAX_WBITS 15 /* 32K LZ77 window */
36#endif
37
38/* default windowBits for decompression. MAX_WBITS is for compression only */
39#ifndef DEF_WBITS
40# define DEF_WBITS MAX_WBITS
41#endif
42
43/* default memLevel */
44#if MAX_MEM_LEVEL >= 8
45# define DEF_MEM_LEVEL 8
46#else
47# define DEF_MEM_LEVEL MAX_MEM_LEVEL
48#endif
49
50 /* Type declarations */
51
52typedef unsigned char Byte; /* 8 bits */
53typedef unsigned int uInt; /* 16 bits or more */
54typedef unsigned long uLong; /* 32 bits or more */
55typedef void *voidp;
56
57#endif /* _ZCONF_H */