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/*
This file is part of GNUnet.
Copyright (C) 2022 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/compress.c
* @brief Simple (de)compression logic
* @author Philipp Toelke
* @author Martin Schanzenbach
*/
#include "platform.h"
#include "gnunet_util_lib.h"
#include <zlib.h>
int
GNUNET_try_compression (const char *data,
size_t old_size,
char **result,
size_t *new_size)
{
char *tmp;
uLongf dlen;
*result = NULL;
*new_size = 0;
#ifdef compressBound
dlen = compressBound (old_size);
#else
dlen = old_size + (old_size / 100) + 20;
/* documentation says 100.1% oldSize + 12 bytes, but we
* should be able to overshoot by more to be safe */
#endif
tmp = GNUNET_malloc (dlen);
if (Z_OK ==
compress2 ((Bytef *) tmp,
&dlen,
(const Bytef *) data,
old_size, 9))
{
if (dlen < old_size)
{
*result = tmp;
*new_size = dlen;
return GNUNET_YES;
}
}
GNUNET_free (tmp);
return GNUNET_NO;
}
char *
GNUNET_decompress (const char *input,
size_t input_size,
size_t output_size)
{
char *output;
uLongf olen;
olen = output_size;
output = GNUNET_malloc (olen);
if (Z_OK ==
uncompress ((Bytef *) output,
&olen,
(const Bytef *) input,
input_size))
return output;
GNUNET_free (output);
return NULL;
}
/* end of compress.c */
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