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/* $OpenBSD: binary.c,v 1.18 2013/11/12 22:50:42 deraadt Exp $ */ |
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/*- |
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* Copyright (c) 1999 James Howard and Dag-Erling Coïdan Smørgrav |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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*/ |
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#include <ctype.h> |
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#include <err.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include <zlib.h> |
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#include "grep.h" |
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static int |
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isbinary(const char *buf, size_t n) |
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{ |
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return (memchr(buf, '\0', n) != NULL); |
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} |
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int |
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bin_file(FILE *f) |
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{ |
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char buf[BUFSIZ]; |
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size_t m; |
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int ret = 0; |
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✓✓ |
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if (fseek(f, 0L, SEEK_SET) == -1) |
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return 0; |
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✓✓ |
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if ((m = fread(buf, 1, BUFSIZ, f)) == 0) |
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return 0; |
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✗✓ |
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if (isbinary(buf, m)) |
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ret = 1; |
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rewind(f); |
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return ret; |
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} |
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#ifndef NOZ |
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int |
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gzbin_file(gzFile *f) |
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{ |
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char buf[BUFSIZ]; |
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int m; |
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int ret = 0; |
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if (gzseek(f, (z_off_t)0, SEEK_SET) == -1) |
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return 0; |
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if ((m = gzread(f, buf, BUFSIZ)) <= 0) |
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return 0; |
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if (isbinary(buf, m)) |
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ret = 1; |
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if (gzrewind(f) != 0) |
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err(1, "gzbin_file"); |
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return ret; |
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} |
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#endif |
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#ifndef SMALL |
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int |
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mmbin_file(mmf_t *f) |
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{ |
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/* XXX knows too much about mmf internals */ |
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✓✓ |
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return isbinary(f->base, f->len < BUFSIZ ? f->len : BUFSIZ); |
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} |
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#endif |