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1/* $OpenBSD: binary.c,v 1.20 2021/12/15 19:22:44 tb Exp $ */
2
3/*-
4 * Copyright (c) 1999 James Howard and Dag-Erling Co�dan Sm�rgrav
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
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 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <ctype.h>
30#include <err.h>
31#include <stdio.h>
32#include <string.h>
33#include <unistd.h>
34#include <zlib.h>
35
36#include "grep.h"
37
38static int
39isbinary(const char *buf, size_t n)
40{
41 return (memchr(buf, '\0', n) != NULL);
42}
43
44int
45bin_file(FILE *f)
46{
47 char buf[BUFSIZ];
48 size_t m;
49 int ret = 0;
50
51 if (fseek(f, 0L, SEEK_SET) == -1)
52 return 0;
53
54 if ((m = fread(buf, 1, BUFSIZ, f)) == 0)
55 return 0;
56
57 if (isbinary(buf, m))
58 ret = 1;
59
60 rewind(f);
61 return ret;
62}
63
64#ifndef NOZ
65int
66gzbin_file(gzFile f)
67{
68 char buf[BUFSIZ];
69 int m;
70 int ret = 0;
71
72 if (gzseek(f, (z_off_t)0, SEEK_SET) == -1)
73 return 0;
74
75 if ((m = gzread(f, buf, BUFSIZ)) <= 0)
76 return 0;
77
78 if (isbinary(buf, m))
79 ret = 1;
80
81 if (gzrewind(f) != 0)
82 err(1, "gzbin_file");
83 return ret;
84}
85#endif
86
87#ifndef SMALL
88int
89mmbin_file(mmf_t *f)
90{
91 /* XXX knows too much about mmf internals */
92 return isbinary(f->base, f->len < BUFSIZ ? f->len : BUFSIZ);
93}
94#endif