2 * Copyright (c) Christos Zoulas 2003.
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 immediately at the beginning of the file, without modification,
10 * this list of conditions, and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
19 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 FILE_RCSID("@(#)$Id: funcs.c,v 1.13 2004/09/11 19:15:57 christos Exp $")
38 * Like printf, only we print to a buffer and advance it.
41 file_printf(struct magic_set *ms, const char *fmt, ...)
49 if ((len = vsnprintf(ms->o.ptr, ms->o.len, fmt, ap)) >= ms->o.len) {
51 if ((buf = realloc(ms->o.buf, len + 1024)) == NULL) {
55 ms->o.ptr = buf + (ms->o.ptr - ms->o.buf);
57 ms->o.len = ms->o.size - (ms->o.ptr - ms->o.buf);
58 ms->o.size = len + 1024;
61 len = vsnprintf(ms->o.ptr, ms->o.len, fmt, ap);
70 * error - print best error message possible
74 file_error(struct magic_set *ms, int error, const char *f, ...)
77 /* Only the first error is ok */
81 (void)vsnprintf(ms->o.buf, ms->o.size, f, va);
84 size_t len = strlen(ms->o.buf);
85 (void)snprintf(ms->o.buf + len, ms->o.size - len, " (%s)",
94 file_oomem(struct magic_set *ms)
96 file_error(ms, errno, "cannot allocate memory");
100 file_badseek(struct magic_set *ms)
102 file_error(ms, errno, "error seeking");
106 file_badread(struct magic_set *ms)
108 file_error(ms, errno, "error reading");
113 file_buffer(struct magic_set *ms, const void *buf, size_t nb)
116 /* try compression stuff */
117 if ((m = file_zmagic(ms, buf, nb)) == 0) {
118 /* Check if we have a tar file */
119 if ((m = file_is_tar(ms, buf, nb)) == 0) {
120 /* try tests in /etc/magic (or surrogate magic file) */
121 if ((m = file_softmagic(ms, buf, nb)) == 0) {
122 /* try known keywords, check whether it is ASCII */
123 if ((m = file_ascmagic(ms, buf, nb)) == 0) {
124 /* abandon hope, all ye who remain here */
125 if (file_printf(ms, ms->flags & MAGIC_MIME ?
126 "application/octet-stream" : "data") == -1)
138 file_reset(struct magic_set *ms)
140 if (ms->mlist == NULL) {
141 file_error(ms, 0, "no magic files loaded");
144 ms->o.ptr = ms->o.buf;
150 protected const char *
151 file_getbuffer(struct magic_set *ms)
153 char *nbuf, *op, *np;
159 if (ms->flags & MAGIC_RAW)
162 nsize = ms->o.len * 4 + 1;
163 if (ms->o.psize < nsize) {
164 if ((nbuf = realloc(ms->o.pbuf, nsize)) == NULL) {
172 for (np = ms->o.pbuf, op = ms->o.buf; *op; op++) {
173 if (isprint((unsigned char)*op)) {
177 *np++ = ((*op >> 6) & 3) + '0';
178 *np++ = ((*op >> 3) & 7) + '0';
179 *np++ = ((*op >> 0) & 7) + '0';