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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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C
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107/* zutil.h -- internal interface and configuration of the compression library * Copyright (C) 1995-1998 Jean-loup Gailly. * For conditions of distribution and use, see copyright notice in zlib.h */
/* WARNING: this file should *not* be used by applications. It is part of the implementation of the compression library and is subject to change. Applications should only use zlib.h. */
/* @(#) $Id: zutil.h,v 1.1 2000/01/01 03:32:23 davem Exp $ */
#ifndef _Z_UTIL_H#define _Z_UTIL_H
#include <linux/zlib.h>#include <linux/string.h>#include <linux/kernel.h>
typedef unsigned char uch;typedef unsigned short ush;typedef unsigned long ulg;
/* common constants */
#define STORED_BLOCK 0#define STATIC_TREES 1#define DYN_TREES 2/* The three kinds of block type */
#define MIN_MATCH 3#define MAX_MATCH 258/* The minimum and maximum match lengths */
#define PRESET_DICT 0x20 /* preset dictionary flag in zlib header */
/* target dependencies */
/* Common defaults */
#ifndef OS_CODE# define OS_CODE 0x03 /* assume Unix */#endif
/* functions */
typedef uLong (*check_func) (uLong check, const Byte *buf, uInt len);
/* checksum functions */
#define BASE 65521L /* largest prime smaller than 65536 */#define NMAX 5552/* NMAX is the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 */
#define DO1(buf,i) {s1 += buf[i]; s2 += s1;}#define DO2(buf,i) DO1(buf,i); DO1(buf,i+1);#define DO4(buf,i) DO2(buf,i); DO2(buf,i+2);#define DO8(buf,i) DO4(buf,i); DO4(buf,i+4);#define DO16(buf) DO8(buf,0); DO8(buf,8);
/* ========================================================================= *//* Update a running Adler-32 checksum with the bytes buf[0..len-1] and return the updated checksum. If buf is NULL, this function returns the required initial value for the checksum. An Adler-32 checksum is almost as reliable as a CRC32 but can be computed much faster. Usage example:
uLong adler = zlib_adler32(0L, NULL, 0);
while (read_buffer(buffer, length) != EOF) { adler = zlib_adler32(adler, buffer, length); } if (adler != original_adler) error();*/static inline uLong zlib_adler32(uLong adler, const Byte *buf, uInt len){ unsigned long s1 = adler & 0xffff; unsigned long s2 = (adler >> 16) & 0xffff; int k;
if (buf == NULL) return 1L;
while (len > 0) { k = len < NMAX ? len : NMAX; len -= k; while (k >= 16) { DO16(buf); buf += 16; k -= 16; } if (k != 0) do { s1 += *buf++; s2 += s1; } while (--k); s1 %= BASE; s2 %= BASE; } return (s2 << 16) | s1;}
#endif /* _Z_UTIL_H */