1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
|
/* $OpenBSD: binary.c,v 1.19 2021/03/10 21:55:22 millert Exp $ */
/*-
* Copyright (c) 1999 James Howard and Dag-Erling Co�dan Sm�rgrav
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <ctype.h>
#include <err.h>
#include <stdio.h>
#include <string.h>
#include <zlib.h>
#include "grep.h"
static int
isbinary(const char *buf, size_t n)
{
return (memchr(buf, '\0', n) != NULL);
}
int
bin_file(FILE *f)
{
char buf[BUFSIZ];
size_t m;
int ret = 0;
if (fseek(f, 0L, SEEK_SET) == -1)
return 0;
if ((m = fread(buf, 1, BUFSIZ, f)) == 0)
return 0;
if (isbinary(buf, m))
ret = 1;
rewind(f);
return ret;
}
#ifndef NOZ
int
gzbin_file(gzFile f)
{
char buf[BUFSIZ];
int m;
int ret = 0;
if (gzseek(f, (z_off_t)0, SEEK_SET) == -1)
return 0;
if ((m = gzread(f, buf, BUFSIZ)) <= 0)
return 0;
if (isbinary(buf, m))
ret = 1;
if (gzrewind(f) != 0)
err(1, "gzbin_file");
return ret;
}
#endif
#ifndef SMALL
int
mmbin_file(mmf_t *f)
{
/* XXX knows too much about mmf internals */
return isbinary(f->base, f->len < BUFSIZ ? f->len : BUFSIZ);
}
#endif
|
