1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1996-2009 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 * bsd 24 */ 25 26 #define bsd_description \ 27 "The BSD checksum." 28 #define bsd_options 0 29 #define bsd_match "bsd|ucb" 30 #define bsd_open long_open 31 #define bsd_init long_init 32 #define bsd_done short_done 33 #define bsd_print long_print 34 #define bsd_data long_data 35 #define bsd_scale 1024 36 37 static int 38 bsd_block(register Sum_t* p, const void* s, size_t n) 39 { 40 register uint32_t c = ((Integral_t*)p)->sum; 41 register unsigned char* b = (unsigned char*)s; 42 register unsigned char* e = b + n; 43 44 while (b < e) 45 c = ((c >> 1) + *b++ + ((c & 01) ? 0x8000 : 0)) & 0xffff; 46 ((Integral_t*)p)->sum = c; 47 return 0; 48 } 49