cregit-Linux how code gets into the kernel

Release 4.7 include/linux/zutil.h

Directory: include/linux
/* 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; }

Contributors

PersonTokensPropCommitsCommitProp
linus torvaldslinus torvalds13398.52%133.33%
joern engeljoern engel21.48%266.67%
Total135100.00%3100.00%

#endif /* _Z_UTIL_H */

Overall Contributors

PersonTokensPropCommitsCommitProp
linus torvaldslinus torvalds27395.12%120.00%
joern engeljoern engel134.53%360.00%
anish bhattanish bhatt10.35%120.00%
Total287100.00%5100.00%
Directory: include/linux
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