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view src/zlib/zconf.h @ 17:65de6eb6861a
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author | darius |
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date | Wed, 24 Dec 1997 12:37:24 +0000 |
parents | 1040ca591f2e |
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/* zconf.h -- configuration of the zlib compression library * Copyright (C) 1995 Jean-loup Gailly. * For conditions of distribution and use, see copyright notice in zlib.h */ /* $Id: zconf.h,v 1.1.1.1 1997/12/06 04:37:17 darius Exp $ */ #ifndef _ZCONF_H #define _ZCONF_H /* The library does not install any signal handler. It is recommended to add at least a handler for SIGSEGV when decompressing; the library checks the consistency of the input data whenever possible but may go nuts for some forms of corrupted input. */ /* * Compile with -DMAXSEG_64K if the alloc function cannot allocate more * than 64k bytes at a time (needed on systems with 16-bit int). */ #if defined(_GNUC__) && !defined(__32BIT__) # define __32BIT__ #endif #if defined(__MSDOS__) && !defined(MSDOS) # define MSDOS #endif #if defined(MSDOS) && !defined(__32BIT__) # define MAXSEG_64K #endif #if !defined(STDC) && (defined(MSDOS) || defined(__STDC__)) # define STDC #endif /* Maximum value for memLevel in deflateInit2 */ #ifndef MAX_MEM_LEVEL # ifdef MAXSEG_64K # define MAX_MEM_LEVEL 8 # else # define MAX_MEM_LEVEL 9 # endif #endif /* Maximum value for windowBits in deflateInit2 and inflateInit2 */ #ifndef MAX_WBITS # define MAX_WBITS 15 /* 32K LZ77 window */ #endif /* The memory requirements for deflate are (in bytes): 1 << (windowBits+2) + 1 << (memLevel+9) that is: 128K for windowBits=15 + 128K for memLevel = 8 (default values) plus a few kilobytes for small objects. For example, if you want to reduce the default memory requirements from 256K to 128K, compile with make CFLAGS="-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7" Of course this will generally degrade compression (there's no free lunch). The memory requirements for inflate are (in bytes) 1 << windowBits that is, 32K for windowBits=15 (default value) plus a few kilobytes for small objects. */ /* Type declarations */ #ifndef __P /* function prototypes */ # ifdef STDC # define __P(args) args # else # define __P(args) () # endif #endif #ifndef Byte typedef unsigned char Byte; /* 8 bits */ #endif #ifndef uInt typedef unsigned int uInt; /* 16 bits or more */ #endif #ifndef uLong typedef unsigned long uLong; /* 32 bits or more */ #endif #ifndef voidp # ifdef STDC typedef void *voidp; # else typedef Byte *voidp; # endif #endif #endif /* _ZCONF_H */