criov.c revision 116191 
1/*      $OpenBSD: criov.c,v 1.9 2002/01/29 15:48:29 jason Exp $	*/
2
3/*
4 * Copyright (c) 1999 Theo de Raadt
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 *   notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *   notice, this list of conditions and the following disclaimer in the
14 *   documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 *   derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30#include <sys/cdefs.h>
31__FBSDID("$FreeBSD: head/sys/opencrypto/criov.c 116191 2003-06-11 05:57:50Z obrien $");
32
33#include <sys/param.h>
34#include <sys/systm.h>
35#include <sys/proc.h>
36#include <sys/errno.h>
37#include <sys/malloc.h>
38#include <sys/kernel.h>
39#include <sys/uio.h>
40
41#include <opencrypto/cryptodev.h>
42
43void
44cuio_copydata(struct uio* uio, int off, int len, caddr_t cp)
45{
46	struct iovec *iov = uio->uio_iov;
47	int iol = uio->uio_iovcnt;
48	unsigned count;
49
50	if (off < 0)
51		panic("cuio_copydata: off %d < 0", off);
52	if (len < 0)
53		panic("cuio_copydata: len %d < 0", len);
54	while (off > 0) {
55		if (iol == 0)
56			panic("iov_copydata: empty in skip");
57		if (off < iov->iov_len)
58			break;
59		off -= iov->iov_len;
60		iol--;
61		iov++;
62	}
63	while (len > 0) {
64		if (iol == 0)
65			panic("cuio_copydata: empty");
66		count = min(iov->iov_len - off, len);
67		bcopy(((caddr_t)iov->iov_base) + off, cp, count);
68		len -= count;
69		cp += count;
70		off = 0;
71		iol--;
72		iov++;
73	}
74}
75
76void
77cuio_copyback(struct uio* uio, int off, int len, caddr_t cp)
78{
79	struct iovec *iov = uio->uio_iov;
80	int iol = uio->uio_iovcnt;
81	unsigned count;
82
83	if (off < 0)
84		panic("cuio_copyback: off %d < 0", off);
85	if (len < 0)
86		panic("cuio_copyback: len %d < 0", len);
87	while (off > 0) {
88		if (iol == 0)
89			panic("cuio_copyback: empty in skip");
90		if (off < iov->iov_len)
91			break;
92		off -= iov->iov_len;
93		iol--;
94		iov++;
95	}
96	while (len > 0) {
97		if (iol == 0)
98			panic("uio_copyback: empty");
99		count = min(iov->iov_len - off, len);
100		bcopy(cp, ((caddr_t)iov->iov_base) + off, count);
101		len -= count;
102		cp += count;
103		off = 0;
104		iol--;
105		iov++;
106	}
107}
108
109/*
110 * Return a pointer to iov/offset of location in iovec list.
111 */
112struct iovec *
113cuio_getptr(struct uio *uio, int loc, int *off)
114{
115	struct iovec *iov = uio->uio_iov;
116	int iol = uio->uio_iovcnt;
117
118	while (loc >= 0) {
119		/* Normal end of search */
120		if (loc < iov->iov_len) {
121	    		*off = loc;
122	    		return (iov);
123		}
124
125		loc -= iov->iov_len;
126		if (iol == 0) {
127			if (loc == 0) {
128				/* Point at the end of valid data */
129				*off = iov->iov_len;
130				return (iov);
131			} else
132				return (NULL);
133		} else {
134			iov++, iol--;
135		}
136    	}
137
138	return (NULL);
139}
140