1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1996-2008 AT&T Intellectual Property * 5 * and is licensed under the * 6 * Common Public License, Version 1.0 * 7 * by AT&T Intellectual Property * 8 * * 9 * A copy of the License is available at * 10 * http://www.opensource.org/licenses/cpl1.0.txt * 11 * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 12 * * 13 * Information and Software Systems Research * 14 * AT&T Research * 15 * Florham Park NJ * 16 * * 17 * Glenn Fowler <gsf@research.att.com> * 18 * * 19 ***********************************************************************/ 20 #pragma prototyped 21 22 /* 23 * att 24 */ 25 26 #define att_description \ 27 "The system 5 release 4 checksum. This is the default for \bsum\b \ 28 when \bgetconf UNIVERSE\b is \batt\b. This is the only true sum; \ 29 all of the other methods are order dependent." 30 #define att_options 0 31 #define att_match "att|sys5|s5|default" 32 #define att_open long_open 33 #define att_init long_init 34 #define att_print long_print 35 #define att_data long_data 36 #define att_scale 512 37 38 static int 39 att_block(register Sum_t* p, const void* s, size_t n) 40 { 41 register uint32_t c = ((Integral_t*)p)->sum; 42 register unsigned char* b = (unsigned char*)s; 43 register unsigned char* e = b + n; 44 45 while (b < e) 46 c += *b++; 47 ((Integral_t*)p)->sum = c; 48 return 0; 49 } 50 51 static int 52 att_done(Sum_t* p) 53 { 54 register uint32_t c = ((Integral_t*)p)->sum; 55 56 c = (c & 0xffff) + ((c >> 16) & 0xffff); 57 c = (c & 0xffff) + (c >> 16); 58 ((Integral_t*)p)->sum = c & 0xffff; 59 return short_done(p); 60 } 61