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/*
This file is part of GNUnet.
Copyright (C) 2021 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.
GNUnet 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
Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
SPDX-License-Identifier: AGPL3.0-or-later
*/
/**
* @file util/gnunet-base32.c
* @brief tool to encode/decode from/to the Crockford Base32 encoding GNUnet uses
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet_util_lib.h"
/**
* The main function of gnunet-base32
*
* @param argc number of arguments from the command line
* @param argv command line arguments
* @return 0 ok, 1 on error
*/
int
main (int argc,
char *const *argv)
{
int decode = 0;
const struct GNUNET_GETOPT_CommandLineOption options[] = {
GNUNET_GETOPT_option_flag ('d',
"decode",
gettext_noop ("run decoder modus, otherwise runs as encoder"),
&decode),
GNUNET_GETOPT_option_help ("Crockford base32 encoder/decoder"),
GNUNET_GETOPT_option_version (PACKAGE_VERSION),
GNUNET_GETOPT_OPTION_END
};
int ret;
char *in;
unsigned int in_size;
ssize_t iret;
char *out;
size_t out_size;
if (GNUNET_OK !=
GNUNET_STRINGS_get_utf8_args (argc, argv,
&argc, &argv))
return 2;
ret = GNUNET_GETOPT_run ("gnunet-base32",
options,
argc,
argv);
if (ret < 0)
return 1;
if (0 == ret)
return 0;
in_size = 0;
in = NULL;
iret = 1;
while (iret > 0)
{
/* read in blocks of 4k */
char buf[4092];
iret = read (0,
buf,
sizeof (buf));
if (iret < 0)
{
GNUNET_free (in);
return 2;
}
if (iret > 0)
{
if (iret + in_size < in_size)
{
GNUNET_break (0);
GNUNET_free (in);
return 1;
}
GNUNET_array_grow (in,
in_size,
in_size + iret);
memcpy (&in[in_size - iret],
buf,
iret);
}
}
if (decode)
{
/* This formula can overestimate by 1 byte, so we try both
out_size and out_size-1 below */
out_size = in_size * 5 / 8;
out = GNUNET_malloc (out_size);
if (GNUNET_OK !=
GNUNET_STRINGS_string_to_data (in,
in_size,
out,
out_size))
{
out_size--;
if (GNUNET_OK !=
GNUNET_STRINGS_string_to_data (in,
in_size,
out,
out_size))
{
GNUNET_free (out);
GNUNET_free (in);
return 3;
}
}
}
else
{
out = GNUNET_STRINGS_data_to_string_alloc (in,
in_size);
out_size = strlen (out);
}
{
size_t pos = 0;
while (pos < out_size)
{
iret = write (1,
&out[pos],
out_size - pos);
if (iret <= 0)
return 4;
pos += iret;
}
}
GNUNET_free (out);
GNUNET_free_nz ((void *) argv);
return 0;
}
/* end of gnunet-uri.c */
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