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sum-att.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1996-2007 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                                                                      *
***********************************************************************/
#pragma prototyped

/*
 * att
 */

#define att_description \
      "The system 5 release 4 checksum. This is the default for \bsum\b \
      when \bgetconf UNIVERSE\b is \batt\b. This is the only true sum; \
      all of the other methods are order dependent."
#define att_options     0
#define att_match "att|sys5|s5|default"
#define att_open  long_open
#define att_init  long_init
#define att_print long_print
#define att_data  long_data
#define att_scale 512

static int
att_block(register Sum_t* p, const void* s, size_t n)
{
      register uint32_t c = ((Integral_t*)p)->sum;
      register unsigned char* b = (unsigned char*)s;
      register unsigned char* e = b + n;

      while (b < e)
            c += *b++;
      ((Integral_t*)p)->sum = c;
      return 0;
}

static int
att_done(Sum_t* p)
{
      register uint32_t c = ((Integral_t*)p)->sum;

      c = (c & 0xffff) + ((c >> 16) & 0xffff);
      c = (c & 0xffff) + (c >> 16);
      ((Integral_t*)p)->sum = c & 0xffff;
      return short_done(p);
}

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