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 2 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, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  19  * USA.
  20  */
  21
  22 #include <config.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <errno.h>
  27 #include <assert.h>
  28
  29 #include "gpg.h"
  30 #include "errors.h"
  31 #include "iobuf.h"
  32 #include "util.h"
  33 #include "filter.h"
  34 #include "packet.h"
  35 #include "options.h"
  36 #include "main.h"
  37 #include "i18n.h"
  38
  39 /****************
  40  * Take an armor file and write it out without armor
  41  */
  42 int
  43 dearmor_file( const char *fname )
  44 {
  45     armor_filter_context_t afx;
  46     IOBUF inp = NULL, out = NULL;
  47     int rc = 0;
  48     int c;
  49
  50     memset( &afx, 0, sizeof afx);
  51
  52     /* prepare iobufs */
  53     inp = iobuf_open(fname);
  54     if (inp && is_secured_file (iobuf_get_fd (inp)))
  55       {
  56         iobuf_close (inp);
  57         inp = NULL;
  58         errno = EPERM;
  59       }
  60     if (!inp) {
  61         rc = gpg_error_from_errno (errno);
  62         log_error(_("can't open `%s': %s\n"), fname? fname: "[stdin]",
  63                                         strerror(errno) );
  64         goto leave;
  65     }
  66
  67     iobuf_push_filter( inp, armor_filter, &afx );
  68
  69     if( (rc = open_outfile( fname, 0, &out )) )
  70         goto leave;
  71
  72
  73
  74     while( (c = iobuf_get(inp)) != -1 )
  75         iobuf_put( out, c );
  76
  77
  78   leave:
  79     if( rc )
  80         iobuf_cancel(out);
  81     else
  82         iobuf_close(out);
  83     iobuf_close(inp);
  84     return rc;
  85 }
  86
  87
  88 /****************
  89  * Take file and write it out with armor
  90  */
  91 int
  92 enarmor_file( const char *fname )
  93 {
  94     armor_filter_context_t afx;
  95     IOBUF inp = NULL, out = NULL;
  96     int rc = 0;
  97     int c;
  98
  99     memset( &afx, 0, sizeof afx);
 100
 101     /* prepare iobufs */
 102     inp = iobuf_open(fname);
 103     if (inp && is_secured_file (iobuf_get_fd (inp)))
 104       {
 105         iobuf_close (inp);
 106         inp = NULL;
 107         errno = EPERM;
 108       }
 109     if (!inp) {
 110         rc = gpg_error_from_errno (errno);
 111         log_error(_("can't open `%s': %s\n"), fname? fname: "[stdin]",
 112                   strerror(errno) );
 113         goto leave;
 114     }
 115
 116
 117     if( (rc = open_outfile( fname, 1, &out )) )
 118         goto leave;
 119
 120     afx.what = 4;
 121     afx.hdrlines = "Comment: Use \"gpg --dearmor\" for unpacking\n";
 122     iobuf_push_filter( out, armor_filter, &afx );
 123
 124     while( (c = iobuf_get(inp)) != -1 )
 125         iobuf_put( out, c );
 126
 127
 128   leave:
 129     if( rc )
 130         iobuf_cancel(out);
 131     else
 132         iobuf_close(out);
 133     iobuf_close(inp);
 134     return rc;
 135 }
 136
 137