projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
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 */ | |
| 4f3865fb RP |
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 | |
| 1da177e4 LT |
48 | #endif |
| 49 | ||
| 50 | /* Type declarations */ | |
| 51 | ||
| 52 | typedef unsigned char Byte; /* 8 bits */ | |
| 53 | typedef unsigned int uInt; /* 16 bits or more */ | |
| 54 | typedef unsigned long uLong; /* 32 bits or more */ | |
| 55 | typedef void *voidp; | |
| 56 | ||
| 57 | #endif /* _ZCONF_H */ |