g10/dearmor.c

   1 /* dearmor.c - Armor utility
   2  * Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
   3  *
   4  * This file is part of GnuPG.
   5  *
   6  * GnuPG is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * GnuPG is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <config.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <errno.h>
  25 #include <assert.h>
  26
  27 #include "gpg.h"
  28 #include "status.h"
  29 #include "iobuf.h"
  30 #include "util.h"
  31 #include "filter.h"
  32 #include "packet.h"
  33 #include "options.h"
  34 #include "main.h"
  35 #include "i18n.h"
  36
  37 /****************
  38  * Take an armor file and write it out without armor
  39  */
  40 int
  41 dearmor_file( const char *fname )
  42 {
  43     armor_filter_context_t *afx;
  44     IOBUF inp = NULL, out = NULL;
  45     int rc = 0;
  46     int c;
  47
  48     afx = new_armor_context ();
  49
  50     /* prepare iobufs */
  51     inp = iobuf_open(fname);
  52     if (inp && is_secured_file (iobuf_get_fd (inp)))
  53       {
  54         iobuf_close (inp);
  55         inp = NULL;
  56         errno = EPERM;
  57       }
  58     if (!inp) {
  59         rc = gpg_error_from_syserror ();
  60         log_error(_("can't open `%s': %s\n"), fname? fname: "[stdin]",
  61                                         strerror(errno) );
  62         goto leave;
  63     }
  64
  65     push_armor_filter ( afx, inp );
  66
  67     if( (rc = open_outfile( fname, 0, &out )) )
  68         goto leave;
  69
  70     while( (c = iobuf_get(inp)) != -1 )
  71         iobuf_put( out, c );
  72
  73   leave:
  74     if( rc )
  75         iobuf_cancel(out);
  76     else
  77         iobuf_close(out);
  78     iobuf_close(inp);
  79     release_armor_context (afx);
  80     return rc;
  81 }
  82
  83
  84 /****************
  85  * Take file and write it out with armor
  86  */
  87 int
  88 enarmor_file( const char *fname )
  89 {
  90     armor_filter_context_t *afx;
  91     IOBUF inp = NULL, out = NULL;
  92     int rc = 0;
  93     int c;
  94
  95     afx = new_armor_context ();
  96
  97     /* prepare iobufs */
  98     inp = iobuf_open(fname);
  99     if (inp && is_secured_file (iobuf_get_fd (inp)))
 100       {
 101         iobuf_close (inp);
 102         inp = NULL;
 103         errno = EPERM;
 104       }
 105     if (!inp) {
 106         rc = gpg_error_from_syserror ();
 107         log_error(_("can't open `%s': %s\n"), fname? fname: "[stdin]",
 108                   strerror(errno) );
 109         goto leave;
 110     }
 111
 112
 113     if( (rc = open_outfile( fname, 1, &out )) )
 114         goto leave;
 115
 116     afx->what = 4;
 117     afx->hdrlines = "Comment: Use \"gpg --dearmor\" for unpacking\n";
 118     push_armor_filter ( afx, out );
 119
 120     while( (c = iobuf_get(inp)) != -1 )
 121         iobuf_put( out, c );
 122
 123
 124   leave:
 125     if( rc )
 126         iobuf_cancel(out);
 127     else
 128         iobuf_close(out);
 129     iobuf_close(inp);
 130     release_armor_context (afx);
 131     return rc;
 132 }
 133
 134