1 /* $OpenBSD: binary.c,v 1.18 2013/11/12 22:50:42 deraadt 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 <zlib.h> 34 35 #include "grep.h" 36 37 static int 38 isbinary(const char *buf, size_t n) 39 { 40 return (memchr(buf, '\0', n) != NULL); 41 } 42 43 int 44 bin_file(FILE *f) 45 { 46 char buf[BUFSIZ]; 47 size_t m; 48 int ret = 0; 49 50 if (fseek(f, 0L, SEEK_SET) == -1) 51 return 0; 52 53 if ((m = fread(buf, 1, BUFSIZ, f)) == 0) 54 return 0; 55 56 if (isbinary(buf, m)) 57 ret = 1; 58 59 rewind(f); 60 return ret; 61 } 62 63 #ifndef NOZ 64 int 65 gzbin_file(gzFile *f) 66 { 67 char buf[BUFSIZ]; 68 int m; 69 int ret = 0; 70 71 if (gzseek(f, (z_off_t)0, SEEK_SET) == -1) 72 return 0; 73 74 if ((m = gzread(f, buf, BUFSIZ)) <= 0) 75 return 0; 76 77 if (isbinary(buf, m)) 78 ret = 1; 79 80 if (gzrewind(f) != 0) 81 err(1, "gzbin_file"); 82 return ret; 83 } 84 #endif 85 86 #ifndef SMALL 87 int 88 mmbin_file(mmf_t *f) 89 { 90 /* XXX knows too much about mmf internals */ 91 return isbinary(f->base, f->len < BUFSIZ ? f->len : BUFSIZ); 92 } 93 #endif 94