2 * Copyright (c) 2000, Boris Popov
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by Boris Popov.
16 * 4. Neither the name of the author nor the names of any co-contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * $Id: mbuf.c,v 1.6 2001/02/24 15:56:04 bp Exp $
35 #include <sys/types.h>
36 #include <sys/mchain.h>
43 #include <netsmb/smb_lib.h>
45 #define MBERROR(format, args...) printf("%s(%d): "format, __FUNCTION__ , \
49 m_get(size_t len, struct mbuf **mpp)
56 m = malloc(M_BASESIZE + len);
59 bzero(m, M_BASESIZE + len);
67 m_free(struct mbuf *m)
73 m_freem(struct mbuf *m0)
85 m_totlen(struct mbuf *m0)
98 m_lineup(struct mbuf *m0, struct mbuf **mpp)
105 if (m0->m_next == NULL) {
109 if ((error = m_get(m_totlen(m0), &nm)) != 0)
111 dp = mtod(nm, char *);
114 bcopy(m0->m_data, dp, len);
125 mb_init(struct mbdata *mbp, size_t size)
130 if ((error = m_get(size, &m)) != 0)
132 return mb_initm(mbp, m);
136 mb_initm(struct mbdata *mbp, struct mbuf *m)
138 bzero(mbp, sizeof(*mbp));
139 mbp->mb_top = mbp->mb_cur = m;
140 mbp->mb_pos = mtod(m, char *);
145 mb_done(struct mbdata *mbp)
148 m_freem(mbp->mb_top);
156 mb_fixhdr(struct mbdata *mbp)
158 struct mbuf *m = mbp->mb_top;
165 mbp->mb_top->m_pkthdr.len = len;
170 m_getm(struct mbuf *top, size_t len, struct mbuf **mpp)
175 for (mp = top; ; mp = mp->m_next) {
176 len -= M_TRAILINGSPACE(mp);
177 if (mp->m_next == NULL)
182 if ((error = m_get(len, &m)) != 0)
191 * Routines to put data in a buffer
193 #define MB_PUT(t) int error; t *p; \
194 if ((error = mb_fit(mbp, sizeof(t), (char**)&p)) != 0) \
198 * Check if object of size 'size' fit to the current position and
199 * allocate new mbuf if not. Advance pointers and increase length of mbuf(s).
200 * Return pointer to the object placeholder or NULL if any error occured.
203 mb_fit(struct mbdata *mbp, size_t size, char **pp)
209 if (M_TRAILINGSPACE(m) < (int)size) {
210 if ((error = m_get(size, &mn)) != 0)
212 mbp->mb_pos = mtod(mn, char *);
213 mbp->mb_cur = m->m_next = mn;
219 mbp->mb_count += size;
224 mb_put_uint8(struct mbdata *mbp, u_int8_t x)
232 mb_put_uint16be(struct mbdata *mbp, u_int16_t x)
240 mb_put_uint16le(struct mbdata *mbp, u_int16_t x)
248 mb_put_uint32be(struct mbdata *mbp, u_int32_t x)
256 mb_put_uint32le(struct mbdata *mbp, u_int32_t x)
264 mb_put_int64be(struct mbdata *mbp, int64_t x)
272 mb_put_int64le(struct mbdata *mbp, int64_t x)
280 mb_put_mem(struct mbdata *mbp, const char *source, size_t size)
290 if ((error = m_getm(m, size, &m)) != 0)
293 cplen = M_TRAILINGSPACE(m);
300 dst = mtod(m, char *) + m->m_len;
302 bcopy(source, dst, cplen);
308 mbp->mb_count += cplen;
310 mbp->mb_pos = mtod(m, char *) + m->m_len;
316 mb_put_mbuf(struct mbdata *mbp, struct mbuf *m)
318 mbp->mb_cur->m_next = m;
320 mbp->mb_count += m->m_len;
321 if (m->m_next == NULL)
325 mbp->mb_pos = mtod(m, char *) + m->m_len;
331 mb_put_pstring(struct mbdata *mbp, const char *s)
333 int error, len = strlen(s);
338 if ((error = mb_put_uint8(mbp, len)) != 0)
340 return mb_put_mem(mbp, s, len);
344 * Routines for fetching data from an mbuf chain
346 #define mb_left(m,p) (mtod(m, char *) + (m)->m_len - (p))
349 mb_get_uint8(struct mbdata *mbp, u_int8_t *x)
351 return mb_get_mem(mbp, x, 1);
355 mb_get_uint16(struct mbdata *mbp, u_int16_t *x)
357 return mb_get_mem(mbp, (char *)x, 2);
361 mb_get_uint16le(struct mbdata *mbp, u_int16_t *x)
364 int error = mb_get_uint16(mbp, &v);
371 mb_get_uint16be(struct mbdata *mbp, u_int16_t *x) {
373 int error = mb_get_uint16(mbp, &v);
380 mb_get_uint32(struct mbdata *mbp, u_int32_t *x)
382 return mb_get_mem(mbp, (char *)x, 4);
386 mb_get_uint32be(struct mbdata *mbp, u_int32_t *x)
391 error = mb_get_uint32(mbp, &v);
397 mb_get_uint32le(struct mbdata *mbp, u_int32_t *x)
402 error = mb_get_uint32(mbp, &v);
408 mb_get_int64(struct mbdata *mbp, int64_t *x)
410 return mb_get_mem(mbp, (char *)x, 8);
414 mb_get_int64be(struct mbdata *mbp, int64_t *x)
419 error = mb_get_int64(mbp, &v);
425 mb_get_int64le(struct mbdata *mbp, int64_t *x)
430 error = mb_get_int64(mbp, &v);
436 mb_get_mem(struct mbdata *mbp, char * target, size_t size)
438 struct mbuf *m = mbp->mb_cur;
443 MBERROR("incomplete copy\n");
446 count = mb_left(m, mbp->mb_pos);
448 mbp->mb_cur = m = m->m_next;
450 mbp->mb_pos = mtod(m, char *);
458 *target++ = *mbp->mb_pos;
460 bcopy(mbp->mb_pos, target, count);
464 mbp->mb_pos += count;