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BPDECODE.C
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C/C++ Source or Header
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1994-11-16
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6KB
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192 lines
/*
* Copyright (c) 1983 Regents of the University of California.
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*/
/*
* DESCRIPTION: This file and program were modified on 11-10-1994
* to allow for the renaming of the uu output files
* for dos machines...
* EXAMPLE:
* FILE.AAAA.bin was uuencoded into a file we'll call FILEAAAA.uu
* on a UN*X machine and transported via sneakernet to an MS-DOS
* machine where I wish to uudecode it. Because the filename is
* either too long or has two periods in it, it doesn't work.
* So this program and the command:
* C:\> bgpuudec.exe FILEAAAA.uu outname.bin
* will create FILE.AAAA.bin with the new name outname.bin
*
* LIMITATIONS: You can't use stdin and must do one file at a time.
* As of yet, no error checking is done on new filename.
*
* BUGS: None that I know of except for some of the error messages
* aren't very pretty.
*
* CONTRIBUTOR:
* Brad Parks
* (bparks@intcorp.com)
* 2675 Patton Road
* St.Paul, MN 55113
*/
/*
* uudecode [file] [outfile]
*
* create the specified outfile, decoding as you go.
* used with uuencode.
*/
#include <sys/param.h>
#include <sys/stat.h>
#include <pwd.h>
#include <stdio.h>
#include <string.h>
char *filename, *outfile;
/* ARGSUSED */
main(argc, argv)
int argc;
char **argv;
{
extern int errno;
int rval;
if (*++argv) {
rval = 0;
if (!freopen(filename = *argv, "r", stdin)) {
(void)fprintf(stderr, "uudecode: %s: %s\n",
*argv, "Whoops!");
rval = 1;
}
if (*++argv) {
outfile = *argv;
} else {
outfile = 0;
}
rval |= decode();
} else {
usage(*--argv);
rval = 1;
}
exit(rval);
}
decode()
{
extern int errno;
struct passwd *pw;
register int n;
register char ch, *p;
int mode, n1;
char buf[MAXPATHLEN];
/* search for header line */
do {
if (!fgets(buf, sizeof(buf), stdin)) {
(void)fprintf(stderr,
"uudecode: %s: no \"begin\" line\n", filename);
return(1);
}
} while (strncmp(buf, "begin ", 6));
(void)sscanf(buf, "begin %o %s", &mode, buf);
/* create output file, set mode */
if (outfile != 0) {
strcpy(buf,outfile);
}
if (!freopen(buf, "w", stdout)) {
(void)fprintf(stderr, "uudecode: %s: %s: %s\n", buf,
filename, "strerror(errno)");
return(1);
}
/* for each input line */
for (;;) {
if (!fgets(p = buf, sizeof(buf), stdin)) {
(void)fprintf(stderr, "uudecode: %s: short file.\n",
filename);
return(1);
}
#define DEC(c) (((c) - ' ') & 077) /* single character decode */
/*
* `n' is used to avoid writing out all the characters
* at the end of the file.
*/
if ((n = DEC(*p)) <= 0)
break;
for (++p; n > 0; p += 4, n -= 3)
if (n >= 3) {
ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4;
putchar(ch);
ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2;
putchar(ch);
ch = DEC(p[2]) << 6 | DEC(p[3]);
putchar(ch);
}
else {
if (n >= 1) {
ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4;
putchar(ch);
}
if (n >= 2) {
ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2;
putchar(ch);
}
if (n >= 3) {
ch = DEC(p[2]) << 6 | DEC(p[3]);
putchar(ch);
}
}
}
if (!fgets(buf, sizeof(buf), stdin) || strcmp(buf, "end\n")) {
(void)fprintf(stderr, "uudecode: %s: no \"end\" line.\n",
filename);
return(1);
}
return(0);
}
usage(progname)
char *progname;
{
(void)fprintf(stderr, "\tUSAGE: %s infile [outfile]\n",progname);
(void)fprintf(stderr,
"\t The uuencoded infile will be uudecoded\n");
(void)fprintf(stderr,
"\t and renamed to outfile (if specified).\n");
(void)fprintf(stderr,
"\t stdin is not a valid input source.\n");
exit(1);
}