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freegrep/binary.c
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/*- | |
* Copyright (c) 1999 James Howard and Dag-Erling Coïdan Smørgrav | |
* 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. | |
* | |
* $Id: binary.c,v 1.1.1.1 2004/01/02 14:58:45 cjep Exp $ | |
*/ | |
#include <ctype.h> | |
#include <stdio.h> | |
#include <zlib.h> | |
#include "grep.h" | |
#define BUFFER_SIZE 32 | |
int | |
bin_file(FILE *f) | |
{ | |
char buf[BUFFER_SIZE]; | |
int i, m; | |
if (fseek(f, SEEK_SET, 0) == -1) | |
return 0; | |
if ((m = (int)fread(buf, 1, BUFFER_SIZE, f)) == 0) | |
return 0; | |
for (i = 0; i < m; i++) | |
if (!isprint(buf[i]) && !isspace(buf[i])) | |
return 1; | |
rewind(f); | |
return 0; | |
} | |
int | |
gzbin_file(gzFile *f) | |
{ | |
char buf[BUFFER_SIZE]; | |
int i, m; | |
if (gzseek(f, SEEK_SET, 0) == -1) | |
return 0; | |
if ((m = (int)gzread(f, buf, BUFFER_SIZE)) == 0) | |
return 0; | |
for (i = 0; i < m; i++) | |
if (!isprint(buf[i])) | |
return 1; | |
gzrewind(f); | |
return 0; | |
} | |
int | |
mmbin_file(mmf_t *f) | |
{ | |
int i; | |
/* XXX knows too much about mmf internals */ | |
for (i = 0; i < BUFFER_SIZE && i < f->len; i++) | |
if (!isprint(f->base[i])) | |
return 1; | |
mmrewind(f); | |
return 0; | |
} |