19b50d902SRodney W. Grimes /*-
2*8a16b7a1SPedro F. Giffuni * SPDX-License-Identifier: BSD-3-Clause
3*8a16b7a1SPedro F. Giffuni *
49b50d902SRodney W. Grimes * Copyright (c) 1991, 1993
59b50d902SRodney W. Grimes * The Regents of the University of California. All rights reserved.
69b50d902SRodney W. Grimes *
79b50d902SRodney W. Grimes * Redistribution and use in source and binary forms, with or without
89b50d902SRodney W. Grimes * modification, are permitted provided that the following conditions
99b50d902SRodney W. Grimes * are met:
109b50d902SRodney W. Grimes * 1. Redistributions of source code must retain the above copyright
119b50d902SRodney W. Grimes * notice, this list of conditions and the following disclaimer.
129b50d902SRodney W. Grimes * 2. Redistributions in binary form must reproduce the above copyright
139b50d902SRodney W. Grimes * notice, this list of conditions and the following disclaimer in the
149b50d902SRodney W. Grimes * documentation and/or other materials provided with the distribution.
15fbbd9655SWarner Losh * 3. Neither the name of the University nor the names of its contributors
169b50d902SRodney W. Grimes * may be used to endorse or promote products derived from this software
179b50d902SRodney W. Grimes * without specific prior written permission.
189b50d902SRodney W. Grimes *
199b50d902SRodney W. Grimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
209b50d902SRodney W. Grimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
219b50d902SRodney W. Grimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
229b50d902SRodney W. Grimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
239b50d902SRodney W. Grimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
249b50d902SRodney W. Grimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
259b50d902SRodney W. Grimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
269b50d902SRodney W. Grimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
279b50d902SRodney W. Grimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
289b50d902SRodney W. Grimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
299b50d902SRodney W. Grimes * SUCH DAMAGE.
309b50d902SRodney W. Grimes */
319b50d902SRodney W. Grimes
329b50d902SRodney W. Grimes #include <sys/types.h>
3360b588ebSRobert Drehmel
349b50d902SRodney W. Grimes #include <unistd.h>
35821df508SXin LI #include <stdint.h>
369b50d902SRodney W. Grimes
373fa15ce5SMark Murray #include "extern.h"
383fa15ce5SMark Murray
399b50d902SRodney W. Grimes int
csum2(int fd,uint32_t * cval,off_t * clen)4060b588ebSRobert Drehmel csum2(int fd, uint32_t *cval, off_t *clen)
419b50d902SRodney W. Grimes {
4260b588ebSRobert Drehmel uint32_t lcrc;
433fa15ce5SMark Murray int nr;
4460b588ebSRobert Drehmel off_t total;
453fa15ce5SMark Murray u_char *p;
469b50d902SRodney W. Grimes u_char buf[8192];
479b50d902SRodney W. Grimes
489b50d902SRodney W. Grimes /*
499b50d902SRodney W. Grimes * Draft 8 POSIX 1003.2:
509b50d902SRodney W. Grimes *
519b50d902SRodney W. Grimes * s = sum of all bytes
529b50d902SRodney W. Grimes * r = s % 2^16 + (s % 2^32) / 2^16
533fa15ce5SMark Murray * lcrc = (r % 2^16) + r / 2^16
549b50d902SRodney W. Grimes */
553fa15ce5SMark Murray lcrc = total = 0;
569b50d902SRodney W. Grimes while ((nr = read(fd, buf, sizeof(buf))) > 0)
579b50d902SRodney W. Grimes for (total += nr, p = buf; nr--; ++p)
583fa15ce5SMark Murray lcrc += *p;
599b50d902SRodney W. Grimes if (nr < 0)
609b50d902SRodney W. Grimes return (1);
619b50d902SRodney W. Grimes
623fa15ce5SMark Murray lcrc = (lcrc & 0xffff) + (lcrc >> 16);
633fa15ce5SMark Murray lcrc = (lcrc & 0xffff) + (lcrc >> 16);
649b50d902SRodney W. Grimes
653fa15ce5SMark Murray *cval = lcrc;
669b50d902SRodney W. Grimes *clen = total;
679b50d902SRodney W. Grimes return (0);
689b50d902SRodney W. Grimes }
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