1*75891f45Stb /* $OpenBSD: binary.c,v 1.20 2021/12/15 19:22:44 tb Exp $ */
2fd6e2b5bSderaadt
3fe07e37bSderaadt /*-
4fe07e37bSderaadt * Copyright (c) 1999 James Howard and Dag-Erling Co�dan Sm�rgrav
5fe07e37bSderaadt * All rights reserved.
6fe07e37bSderaadt *
7fe07e37bSderaadt * Redistribution and use in source and binary forms, with or without
8fe07e37bSderaadt * modification, are permitted provided that the following conditions
9fe07e37bSderaadt * are met:
10fe07e37bSderaadt * 1. Redistributions of source code must retain the above copyright
11fe07e37bSderaadt * notice, this list of conditions and the following disclaimer.
12fe07e37bSderaadt * 2. Redistributions in binary form must reproduce the above copyright
13fe07e37bSderaadt * notice, this list of conditions and the following disclaimer in the
14fe07e37bSderaadt * documentation and/or other materials provided with the distribution.
15fe07e37bSderaadt *
16fe07e37bSderaadt * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17fe07e37bSderaadt * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18fe07e37bSderaadt * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19fe07e37bSderaadt * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20fe07e37bSderaadt * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21fe07e37bSderaadt * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22fe07e37bSderaadt * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23fe07e37bSderaadt * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24fe07e37bSderaadt * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25fe07e37bSderaadt * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26fe07e37bSderaadt * SUCH DAMAGE.
27fe07e37bSderaadt */
28fe07e37bSderaadt
29fe07e37bSderaadt #include <ctype.h>
3071d182b2Sotto #include <err.h>
31fe07e37bSderaadt #include <stdio.h>
325ff99970Sstsp #include <string.h>
33*75891f45Stb #include <unistd.h>
34fe07e37bSderaadt #include <zlib.h>
35fe07e37bSderaadt
36fe07e37bSderaadt #include "grep.h"
37fe07e37bSderaadt
384ba547d3Sderaadt static int
isbinary(const char * buf,size_t n)395ff99970Sstsp isbinary(const char *buf, size_t n)
405ff99970Sstsp {
415ff99970Sstsp return (memchr(buf, '\0', n) != NULL);
425ff99970Sstsp }
430079fd18Smillert
44fe07e37bSderaadt int
bin_file(FILE * f)45fe07e37bSderaadt bin_file(FILE *f)
46fe07e37bSderaadt {
4746a19d5dStedu char buf[BUFSIZ];
485ff99970Sstsp size_t m;
4925ef2405Scanacar int ret = 0;
50fe07e37bSderaadt
5171d182b2Sotto if (fseek(f, 0L, SEEK_SET) == -1)
52fe07e37bSderaadt return 0;
53fe07e37bSderaadt
546e7a98c8Sotto if ((m = fread(buf, 1, BUFSIZ, f)) == 0)
55fe07e37bSderaadt return 0;
56fe07e37bSderaadt
575ff99970Sstsp if (isbinary(buf, m))
5825ef2405Scanacar ret = 1;
59fe07e37bSderaadt
60fe07e37bSderaadt rewind(f);
6125ef2405Scanacar return ret;
62fe07e37bSderaadt }
63fe07e37bSderaadt
6438d402d2Sderaadt #ifndef NOZ
65fe07e37bSderaadt int
gzbin_file(gzFile f)6619739ec8Smillert gzbin_file(gzFile f)
67fe07e37bSderaadt {
6846a19d5dStedu char buf[BUFSIZ];
695ff99970Sstsp int m;
7025ef2405Scanacar int ret = 0;
71fe07e37bSderaadt
72ac6b82d9Sderaadt if (gzseek(f, (z_off_t)0, SEEK_SET) == -1)
73fe07e37bSderaadt return 0;
74fe07e37bSderaadt
756e7a98c8Sotto if ((m = gzread(f, buf, BUFSIZ)) <= 0)
76fe07e37bSderaadt return 0;
77fe07e37bSderaadt
785ff99970Sstsp if (isbinary(buf, m))
7925ef2405Scanacar ret = 1;
80fe07e37bSderaadt
8171d182b2Sotto if (gzrewind(f) != 0)
8271d182b2Sotto err(1, "gzbin_file");
8325ef2405Scanacar return ret;
84fe07e37bSderaadt }
8538d402d2Sderaadt #endif
86fe07e37bSderaadt
877fec5d18Snicm #ifndef SMALL
88fe07e37bSderaadt int
mmbin_file(mmf_t * f)89fe07e37bSderaadt mmbin_file(mmf_t *f)
90fe07e37bSderaadt {
91fe07e37bSderaadt /* XXX knows too much about mmf internals */
925ff99970Sstsp return isbinary(f->base, f->len < BUFSIZ ? f->len : BUFSIZ);
93fe07e37bSderaadt }
947fec5d18Snicm #endif
95