287 lines
6.8 KiB
C
287 lines
6.8 KiB
C
/* @(#)file.c 1.10 09/08/04 joerg */
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#include <schily/mconfig.h>
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#ifndef lint
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static UConst char sccsid[] =
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"@(#)file.c 1.10 09/08/04 joerg";
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#endif
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/*
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** find file types by using a modified "magic" file
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**
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** based on file v3.22 by Ian F. Darwin (see below)
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**
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** For each entry in the magic file, the message MUST start with
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** two 4 character strings which are the CREATOR and TYPE for the
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** Mac file. Any continuation lines are ignored. e.g magic entry
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** for a GIF file:
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**
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** 0 string GIF8 8BIM GIFf
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** >4 string 7a \b, version 8%s,
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** >4 string 9a \b, version 8%s,
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** >6 leshort >0 %hd x
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** >8 leshort >0 %hd,
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** #>10 byte &0x80 color mapped,
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** #>10 byte&0x07 =0x00 2 colors
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** #>10 byte&0x07 =0x01 4 colors
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** #>10 byte&0x07 =0x02 8 colors
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** #>10 byte&0x07 =0x03 16 colors
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** #>10 byte&0x07 =0x04 32 colors
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** #>10 byte&0x07 =0x05 64 colors
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** #>10 byte&0x07 =0x06 128 colors
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** #>10 byte&0x07 =0x07 256 colors
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**
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** Just the "8BIM" "GIFf" will be used whatever the type GIF file
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** it is.
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**
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** Modified for mkhybrid James Pearson 19/5/98
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*/
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/*
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* file - find type of a file or files - main program.
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*
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* Copyright (c) Ian F. Darwin, 1987.
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* Written by Ian F. Darwin.
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*
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* This software is not subject to any export provision of the United States
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* Department of Commerce, and may be exported to any country or planet.
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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 immediately at the beginning of the file, without modification,
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* 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 FOR
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* 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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#ifndef lint
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static UConst char moduleid[] =
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"@(#)$Id: file.c,v 1.38 1997/01/15 19:28:35 christos Exp $";
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#endif /* lint */
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#include <schily/stdio.h>
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#include <schily/stdlib.h>
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#include <schily/unistd.h> /* for read() */
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#include <schily/stat.h>
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#include <schily/fcntl.h> /* for open() */
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#ifdef RESTORE_TIME
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#include <schily/utime.h>
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#ifdef HAVE_UTIMES
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#define USE_UTIMES
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#endif
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#endif
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#if 0
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#include <schily/in.h> /* for byte swapping */
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#endif
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#include "patchlevel.h"
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#include "file.h"
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#ifdef MAIN
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/* Global command-line options */
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#ifdef DEBUG
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int debug = 1; /* debugging */
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#else
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int debug = 0; /* debugging */
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#endif /* DEBUG */
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int lflag = 0; /* follow Symlinks (BSD only) */
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int zflag = 0; /* follow (uncompress) compressed files */
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/* Misc globals */
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char *magicfile; /* where magic be found */
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char *progname; /* used throughout */
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#endif
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char * get_magic_match __PR((const char *inname));
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void clean_magic __PR((void));
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#if 0
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static int byteconv4 __P((int, int, int));
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static short byteconv2 __P((int, int, int));
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#endif
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#if 0
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/*
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* byteconv4
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* Input:
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* from 4 byte quantity to convert
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* same whether to perform byte swapping
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* big_endian whether we are a big endian host
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*/
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static int
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byteconv4(from, same, big_endian)
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int from;
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int same;
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int big_endian;
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{
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if (same)
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return from;
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else if (big_endian) /* lsb -> msb conversion on msb */
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{
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union {
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int i;
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char c[4];
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} retval, tmpval;
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tmpval.i = from;
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retval.c[0] = tmpval.c[3];
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retval.c[1] = tmpval.c[2];
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retval.c[2] = tmpval.c[1];
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retval.c[3] = tmpval.c[0];
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return retval.i;
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}
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else
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return ntohl(from); /* msb -> lsb conversion on lsb */
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}
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/*
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* byteconv2
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* Same as byteconv4, but for shorts
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*/
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static short
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byteconv2(from, same, big_endian)
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int from;
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int same;
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int big_endian;
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{
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if (same)
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return from;
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else if (big_endian) /* lsb -> msb conversion on msb */
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{
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union {
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short s;
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char c[2];
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} retval, tmpval;
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tmpval.s = (short) from;
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retval.c[0] = tmpval.c[1];
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retval.c[1] = tmpval.c[0];
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return retval.s;
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}
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else
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return ntohs(from); /* msb -> lsb conversion on lsb */
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}
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#endif
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/*
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* get_magic_match - get the CREATOR/TYPE string
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* based on the original process()
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*/
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char *
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get_magic_match(inname)
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const char *inname;
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{
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int fd = 0;
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unsigned char buf[HOWMANY+1]; /* one extra for terminating '\0' */
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struct stat sb;
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int nbytes = 0; /* number of bytes read from a datafile */
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char *match;
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/* check the file is regular and non-zero length */
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if (stat(inname, &sb) != 0)
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return 0;
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if (sb.st_size == 0 || ! S_ISREG(sb.st_mode))
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return 0;
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if ((fd = open(inname, O_RDONLY)) < 0)
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return 0;
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/*
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* try looking at the first HOWMANY bytes
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*/
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if ((nbytes = read(fd, (char *)buf, HOWMANY)) == -1)
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return 0;
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if (nbytes == 0)
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return 0;
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else {
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buf[nbytes++] = '\0'; /* null-terminate it */
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match = softmagic(buf, nbytes);
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}
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#ifdef RESTORE_TIME
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/* really no point as we going to access the file later anyway */
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{
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/*
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* Try to restore access, modification times if read it.
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*/
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# ifdef USE_UTIMES
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struct timeval utsbuf[2];
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utsbuf[0].tv_sec = sb.st_atime;
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utsbuf[1].tv_sec = sb.st_mtime;
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(void) utimes(inname, utsbuf); /* don't care if loses */
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# else
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struct utimbuf utbuf;
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utbuf.actime = sb.st_atime;
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utbuf.modtime = sb.st_mtime;
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(void) utime(inname, &utbuf); /* don't care if loses */
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# endif
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}
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#endif
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(void) close(fd);
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return(match);
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}
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/*
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* clean_magic - deallocate memory used
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*/
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void
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clean_magic()
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{
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if (__f_magic)
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free(__f_magic);
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}
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#ifdef MAIN
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main(argc, argv)
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int argc;
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char **argv;
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{
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char *ret;
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char creator[5];
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char type[5];
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if (argc < 3)
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exit(1);
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init_magic(argv[1]);
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ret = get_magic_match(argv[2]);
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if (!ret)
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ret = "unixTEXT";
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sscanf(ret, "%4s%4s", creator, type);
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creator[4] = type[4] = '\0';
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printf("%s %s\n", creator, type);
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exit(0);
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}
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#endif /* MAIN */
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