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/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
2016, 2022 MariaDB Corporation AB
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
MA 02111-1301, USA */
/* Initially Written by Sinisa Milivojevic <sinisa@coresinc.com> */
#include <ma_global.h>
#ifdef HAVE_COMPRESS
#include <mysql.h>
#include <ma_common.h>
#include <ma_sys.h>
#include <ma_string.h>
const char *compression_algorithms[] =
{
"none",
"zlib",
"zstd",
"unknown"
};
const char *_mariadb_compression_algorithm_str(enum enum_ma_compression_algorithm algorithm)
{
switch(algorithm) {
case COMPRESSION_NONE:
case COMPRESSION_ZLIB:
case COMPRESSION_ZSTD:
return compression_algorithms[algorithm] ;
default:
return compression_algorithms[COMPRESSION_UNKNOWN];
}
}
/*
** This replaces the packet with a compressed packet
** Returns 1 on error
** *complen is 0 if the packet wasn't compressed
*/
my_bool _mariadb_compress(NET *net, unsigned char *packet, size_t *len, size_t *complen)
{
if (*len < MIN_COMPRESS_LENGTH ||
!compression_plugin(net))
*complen=0;
else
{
unsigned char *compbuf=_mariadb_compress_alloc(net,packet,len,complen);
if (!compbuf)
return *complen ? 0 : 1;
memcpy(packet,compbuf,*len);
free(compbuf);
}
return 0;
}
unsigned char *_mariadb_compress_alloc(NET *net, const unsigned char *packet, size_t *len, size_t *complen)
{
unsigned char *compbuf;
*complen = *len * 120 / 100 + 12;
if (!(compbuf = (unsigned char *) malloc(*complen)))
return 0; /* Not enough memory */
if (compression_plugin(net)->compress(compression_ctx(net), (void *)compbuf, complen, (void *)packet, *len))
{
free(compbuf);
return 0;
}
if (*complen >= *len)
{
*complen=0;
free(compbuf);
return 0;
}
swap(size_t,*len,*complen); /* *len is now packet length */
return compbuf;
}
my_bool _mariadb_uncompress (NET *net, unsigned char *packet, size_t *len, size_t *complen)
{
if (*complen) /* If compressed */
{
unsigned char *compbuf = (unsigned char *) malloc (*complen);
if (!compbuf)
return 1; /* Not enough memory */
if (compression_plugin(net)->decompress(compression_ctx(net), compbuf, complen, packet, len))
{ /* Probably wrong packet */
free(compbuf);
return 1;
}
*len = *complen;
memcpy(packet,compbuf,*len);
free(compbuf);
}
else *complen= *len;
return 0;
}
#endif /* HAVE_COMPRESS */
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