1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
|
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
2016 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 */
/* Written by Sinisa Milivojevic <sinisa@coresinc.com> */
#include <ma_global.h>
#ifdef HAVE_COMPRESS
#include <ma_sys.h>
#include <ma_string.h>
#include <zlib.h>
/*
** 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(unsigned char *packet, size_t *len, size_t *complen)
{
if (*len < MIN_COMPRESS_LENGTH)
*complen=0;
else
{
unsigned char *compbuf=_mariadb_compress_alloc(packet,len,complen);
if (!compbuf)
return *complen ? 0 : 1;
memcpy(packet,compbuf,*len);
free(compbuf);
}
return 0;
}
unsigned char *_mariadb_compress_alloc(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 (compress((Bytef*) compbuf,(ulong *) complen, (Bytef*) packet,
(uLong) *len ) != Z_OK)
{
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 (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 (uncompress((Bytef*) compbuf, (uLongf *)complen, (Bytef*) packet, (uLongf)*len) != Z_OK)
{ /* Probably wrong packet */
free(compbuf);
return 1;
}
*len = *complen;
memcpy(packet,compbuf,*len);
free(compbuf);
}
else *complen= *len;
return 0;
}
#endif /* HAVE_COMPRESS */
|
