LXR linux/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
  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 */
  58