include/linux/zconf.h

   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
  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 */