/* uudecode.c -- uudecode utility. * Copyright (C) 1994, 1995 Free Software Foundation, Inc. * * This product is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2, or (at your option) * any later version. * * This product is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this product; see the file COPYING.  If not, write to * the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA * 02111-1307, USA. * * Reworked to GNU style by Ian Lance Taylor, ian@airs.com, August 93. * * Original copyright notice is retained at the end of this file. */#include <stdio.h>#include <errno.h>#include <getopt.h>#include <string.h>#include <stdlib.h>#include "busybox.h"#include "pwd_.h"#include "grp_.h"/*struct passwd *getpwnam();*//* Single character decode.  */#define	DEC(Char) (((Char) - ' ') & 077)static int read_stduu (const char *inname){  char buf[2 * BUFSIZ];  while (1) {    int n;    char *p;    if (fgets (buf, sizeof(buf), stdin) == NULL) {      error_msg("%s: Short file", inname);      return FALSE;    }    p = buf;    /* N is used to avoid writing out all the characters at the end of       the file.  */    n = DEC (*p);    if (n <= 0)      break;    for (++p; n > 0; p += 4, n -= 3) {      char ch;      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 (fgets (buf, sizeof(buf), stdin) == NULL      || strcmp (buf, "end\n")) {    error_msg("%s: No `end' line", inname);    return FALSE;  }  return TRUE;}static int read_base64 (const char *inname){  static const char b64_tab[256] = {    '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*000-007*/    '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*010-017*/    '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*020-027*/    '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*030-037*/    '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*040-047*/    '\177', '\177', '\177', '\76',  '\177', '\177', '\177', '\77',  /*050-057*/    '\64',  '\65',  '\66',  '\67',  '\70',  '\71',  '\72',  '\73',  /*060-067*/    '\74',  '\75',  '\177', '\177', '\177', '\100', '\177', '\177', /*070-077*/    '\177', '\0',   '\1',   '\2',   '\3',   '\4',   '\5',   '\6',   /*100-107*/    '\7',   '\10',  '\11',  '\12',  '\13',  '\14',  '\15',  '\16',  /*110-117*/    '\17',  '\20',  '\21',  '\22',  '\23',  '\24',  '\25',  '\26',  /*120-127*/    '\27',  '\30',  '\31',  '\177', '\177', '\177', '\177', '\177', /*130-137*/    '\177', '\32',  '\33',  '\34',  '\35',  '\36',  '\37',  '\40',  /*140-147*/    '\41',  '\42',  '\43',  '\44',  '\45',  '\46',  '\47',  '\50',  /*150-157*/    '\51',  '\52',  '\53',  '\54',  '\55',  '\56',  '\57',  '\60',  /*160-167*/    '\61',  '\62',  '\63',  '\177', '\177', '\177', '\177', '\177', /*170-177*/    '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*200-207*/    '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*210-217*/    '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*220-227*/    '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*230-237*/    '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*240-247*/    '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*250-257*/    '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*260-267*/    '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*270-277*/    '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*300-307*/    '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*310-317*/    '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*320-327*/    '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*330-337*/    '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*340-347*/    '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*350-357*/    '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*360-367*/    '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*370-377*/  };  unsigned char buf[2 * BUFSIZ];  while (1) {    int last_data = 0;    unsigned char *p;    if (fgets (buf, sizeof(buf), stdin) == NULL) {      error_msg("%s: Short file", inname);      return FALSE;    }    p = buf;    if (memcmp (buf, "====", 4) == 0)      break;    if (last_data != 0) {      error_msg("%s: data following `=' padding character", inname);      return FALSE;    }    /* The following implementation of the base64 decoding might look       a bit clumsy but I only try to follow the POSIX standard:       ``All line breaks or other characters not found in the table       [with base64 characters] shall be ignored by decoding       software.''  */    while (*p != '\n') {      char c1, c2, c3;      while ((b64_tab[*p] & '\100') != 0)        if (*p == '\n' || *p++ == '=')          break;      if (*p == '\n')        /* This leaves the loop.  */        continue;      c1 = b64_tab[*p++];      while ((b64_tab[*p] & '\100') != 0)        if (*p == '\n' || *p++ == '=') {          error_msg("%s: illegal line", inname);          return FALSE;        }      c2 = b64_tab[*p++];      while (b64_tab[*p] == '\177')        if (*p++ == '\n') {          error_msg("%s: illegal line", inname);          return FALSE;        }      if (*p == '=') {        putchar (c1 << 2 | c2 >> 4);        last_data = 1;        break;      }      c3 = b64_tab[*p++];      while (b64_tab[*p] == '\177')        if (*p++ == '\n') {          error_msg("%s: illegal line", inname);          return FALSE;        }      putchar (c1 << 2 | c2 >> 4);      putchar (c2 << 4 | c3 >> 2);      if (*p == '=') {        last_data = 1;        break;      }      else        putchar (c3 << 6 | b64_tab[*p++]);    }  }  return TRUE;}static int decode (const char *inname,                   const char *forced_outname){  struct passwd *pw;  register char *p;  int mode;  char buf[2 * BUFSIZ];  char *outname;  int do_base64 = 0;  int res;  int dofre;  /* Search for header line.  */  while (1) {    if (fgets (buf, sizeof (buf), stdin) == NULL) {      error_msg("%s: No `begin' line", inname);      return FALSE;    }    if (strncmp (buf, "begin", 5) == 0) {      if (sscanf (buf, "begin-base64 %o %s", &mode, buf) == 2) {        do_base64 = 1;        break;      } else if (sscanf (buf, "begin %o %s", &mode, buf) == 2)        break;    }  }  /* If the output file name is given on the command line this rules.  */  dofre = FALSE;  if (forced_outname != NULL)    outname = (char *) forced_outname;  else {    /* Handle ~user/file format.  */    if (buf[0] != '~')      outname = buf;    else {      p = buf + 1;      while (*p != '/')        ++p;      if (*p == '\0') {        error_msg("%s: Illegal ~user", inname);        return FALSE;      }      *p++ = '\0';      pw = getpwnam (buf + 1);      if (pw == NULL) {        error_msg("%s: No user `%s'", inname, buf + 1);        return FALSE;      }      outname = concat_path_file(pw->pw_dir, p);      dofre = TRUE;    }  }  /* Create output file and set mode.  */  if (strcmp (outname, "/dev/stdout") != 0 && strcmp (outname, "-") != 0      && (freopen (outname, "w", stdout) == NULL	  || chmod (outname, mode & (S_IRWXU | S_IRWXG | S_IRWXO))         )) {    perror_msg("%s", outname); /* */    if (dofre)	free(outname);    return FALSE;  }  /* We differenciate decoding standard UU encoding and base64.  A     common function would only slow down the program.  */  /* For each input line:  */  if (do_base64)      res = read_base64 (inname);  else       res = read_stduu (inname);  if (dofre)      free(outname);  return res;}int uudecode_main (int argc,                   char **argv){  int opt;  int exit_status;  const char *outname;  outname = NULL;  while ((opt = getopt(argc, argv, "o:")) != EOF) {    switch (opt) {     case 0:      break;     case 'o':      outname = optarg;      break;     default:      show_usage();    }  }  if (optind == argc)    exit_status = decode ("stdin", outname) == 0 ? EXIT_SUCCESS : EXIT_FAILURE;  else {    exit_status = EXIT_SUCCESS;    do {      if (freopen (argv[optind], "r", stdin) != NULL) {        if (decode (argv[optind], outname) != 0)          exit_status = FALSE;      } else {        perror_msg("%s", argv[optind]);        exit_status = EXIT_FAILURE;      }      optind++;    }    while (optind < argc);  }  return(exit_status);}/* 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. <BSD Advertising Clause omitted per the July 22, 1999 licensing change  *		ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>  * * 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. */