1 /*- 2 * Copyright (c) 1999 James Howard and Dag-Erling Co�dan Sm�rgrav 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $Id: binary.c,v 1.1 2003/06/22 22:20:07 deraadt Exp $ 27 */ 28 29 #include <ctype.h> 30 #include <stdio.h> 31 #include <zlib.h> 32 33 #include "grep.h" 34 35 #define BUFFER_SIZE 32 36 37 int 38 bin_file(FILE *f) 39 { 40 char buf[BUFFER_SIZE]; 41 int i, m; 42 43 if (fseek(f, SEEK_SET, 0) == -1) 44 return 0; 45 46 if ((m = (int)fread(buf, 1, BUFFER_SIZE, f)) == 0) 47 return 0; 48 49 for (i = 0; i < m; i++) 50 if (!isprint(buf[i]) && !isspace(buf[i])) 51 return 1; 52 53 rewind(f); 54 return 0; 55 } 56 57 int 58 gzbin_file(gzFile *f) 59 { 60 char buf[BUFFER_SIZE]; 61 int i, m; 62 63 if (gzseek(f, SEEK_SET, 0) == -1) 64 return 0; 65 66 if ((m = (int)gzread(f, buf, BUFFER_SIZE)) == 0) 67 return 0; 68 69 for (i = 0; i < m; i++) 70 if (!isprint(buf[i])) 71 return 1; 72 73 gzrewind(f); 74 return 0; 75 } 76 77 int 78 mmbin_file(mmf_t *f) 79 { 80 int i; 81 82 /* XXX knows too much about mmf internals */ 83 for (i = 0; i < BUFFER_SIZE && i < f->len; i++) 84 if (!isprint(f->base[i])) 85 return 1; 86 mmrewind(f); 87 return 0; 88 } 89