g13/utils.c

   1 /* utils.c - Utility functions
   2  * Copyright (C) 2009 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 "g13.h"
  28 #include "utils.h"
  29
  30
  31 /* Append the TAG and the VALUE to the MEMBUF.  There is no error
  32    checking here; this is instead done while getting the value back
  33    from the membuf. */
  34 void
  35 append_tuple (membuf_t *membuf, int tag, const void *value, size_t length)
  36 {
  37   unsigned char buf[2];
  38
  39   assert (tag >= 0 && tag <= 0xffff);
  40   assert (length <= 0xffff);
  41
  42   buf[0] = tag >> 8;
  43   buf[1] = tag;
  44   put_membuf (membuf, buf, 2);
  45   buf[0] = length >> 8;
  46   buf[1] = length;
  47   put_membuf (membuf, buf, 2);
  48   if (length)
  49     put_membuf (membuf, value, length);
  50 }
  51