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 38 static int 39 isbinary(const char *buf, size_t n) 40 { 41 return (memchr(buf, '\0', n) != NULL); 42 } 43 44 int 45 bin_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 65 int 66 gzbin_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 88 int 89 mmbin_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 95