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770cf2286a
ZSTD compression is now supported for connections to a MySQL Server 8.0. Compression algorithms are supported via compression plugins, which can be found in plugins/compress.
114 lines
3.1 KiB
C
114 lines
3.1 KiB
C
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
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2016, 2022 MariaDB Corporation AB
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02111-1301, USA */
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/* Initially Written by Sinisa Milivojevic <sinisa@coresinc.com> */
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#include <ma_global.h>
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#ifdef HAVE_COMPRESS
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#include <mysql.h>
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#include <ma_common.h>
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#include <ma_sys.h>
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#include <ma_string.h>
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const char *compression_algorithms[] =
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{
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"none",
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"zlib",
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"zstd",
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"unknown"
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};
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const char *_mariadb_compression_algorithm_str(enum enum_ma_compression_algorithm algorithm)
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{
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switch(algorithm) {
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case COMPRESSION_NONE:
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case COMPRESSION_ZLIB:
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case COMPRESSION_ZSTD:
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return compression_algorithms[algorithm] ;
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default:
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return compression_algorithms[COMPRESSION_UNKNOWN];
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}
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}
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/*
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** This replaces the packet with a compressed packet
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** Returns 1 on error
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** *complen is 0 if the packet wasn't compressed
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*/
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my_bool _mariadb_compress(NET *net, unsigned char *packet, size_t *len, size_t *complen)
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{
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if (*len < MIN_COMPRESS_LENGTH ||
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!compression_plugin(net))
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*complen=0;
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else
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{
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unsigned char *compbuf=_mariadb_compress_alloc(net,packet,len,complen);
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if (!compbuf)
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return *complen ? 0 : 1;
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memcpy(packet,compbuf,*len);
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free(compbuf);
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}
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return 0;
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}
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unsigned char *_mariadb_compress_alloc(NET *net, const unsigned char *packet, size_t *len, size_t *complen)
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{
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unsigned char *compbuf;
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*complen = *len * 120 / 100 + 12;
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if (!(compbuf = (unsigned char *) malloc(*complen)))
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return 0; /* Not enough memory */
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if (compression_plugin(net)->compress(compression_ctx(net), (void *)compbuf, complen, (void *)packet, *len))
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{
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free(compbuf);
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return 0;
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}
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if (*complen >= *len)
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{
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*complen=0;
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free(compbuf);
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return 0;
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}
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swap(size_t,*len,*complen); /* *len is now packet length */
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return compbuf;
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}
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my_bool _mariadb_uncompress (NET *net, unsigned char *packet, size_t *len, size_t *complen)
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{
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if (*complen) /* If compressed */
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{
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unsigned char *compbuf = (unsigned char *) malloc (*complen);
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if (!compbuf)
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return 1; /* Not enough memory */
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if (compression_plugin(net)->decompress(compression_ctx(net), compbuf, complen, packet, len))
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{ /* Probably wrong packet */
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free(compbuf);
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return 1;
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}
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*len = *complen;
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memcpy(packet,compbuf,*len);
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free(compbuf);
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}
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else *complen= *len;
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return 0;
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}
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#endif /* HAVE_COMPRESS */
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