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
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
|
/**************************************************************************/
/* */
/* Copyright (c) 2001, 2009 NoMachine, http://www.nomachine.com/. */
/* */
/* NXCOMP, NX protocol compression and NX extensions to this software */
/* are copyright of NoMachine. Redistribution and use of the present */
/* software is allowed according to terms specified in the file LICENSE */
/* which comes in the source distribution. */
/* */
/* Check http://www.nomachine.com/licensing.html for applicability. */
/* */
/* NX and NoMachine are trademarks of Medialogic S.p.A. */
/* */
/* All rights reserved. */
/* */
/**************************************************************************/
#include "Misc.h"
#include "BlockCacheSet.h"
BlockCacheSet::BlockCacheSet(unsigned int numCaches):
caches_(new BlockCache *[numCaches]), size_(numCaches),
length_(0)
{
for (unsigned int i = 0; i < numCaches; i++)
caches_[i] = new BlockCache();
}
BlockCacheSet::~BlockCacheSet()
{
//
// TODO: There is still a strange segfault occurring
// at random time under Cygwin, when proxy is being
// shutdown. Problem appeared just after upgrading
// to the latest version of the Cygwin DLL. A stack
// trace, obtained at the last minute, reveals that
// failure happens in this destructor.
//
#ifndef __CYGWIN32__
for (unsigned int i = 0; i < size_; i++)
delete caches_[i];
delete[]caches_;
#endif /* ifdef __CYGWIN32__ */
}
int
BlockCacheSet::lookup(unsigned int dataLength, const unsigned char *data,
unsigned int &index)
{
unsigned int checksum = BlockCache::checksum(dataLength, data);
for (unsigned int i = 0; i < length_; i++)
if ((caches_[i]->getChecksum() == checksum) &&
(caches_[i]->compare(dataLength, data, 0)))
{
// match
index = i;
if (i)
{
BlockCache *save = caches_[i];
unsigned int target = (i >> 1);
do
{
caches_[i] = caches_[i - 1];
i--;
}
while (i > target);
caches_[target] = save;
}
return 1;
}
// no match
unsigned int insertionPoint = (length_ >> 1);
unsigned int start;
if (length_ >= size_)
start = size_ - 1;
else
{
start = length_;
length_++;
}
BlockCache *save = caches_[start];
for (unsigned int k = start; k > insertionPoint; k--)
caches_[k] = caches_[k - 1];
caches_[insertionPoint] = save;
save->set(dataLength, data);
return 0;
}
void
BlockCacheSet::get(unsigned index, unsigned int &size,
const unsigned char *&data)
{
size = caches_[index]->getLength();
data = caches_[index]->getData();
if (index)
{
BlockCache *save = caches_[index];
unsigned int target = (index >> 1);
do
{
caches_[index] = caches_[index - 1];
index--;
}
while (index > target);
caches_[target] = save;
}
}
void
BlockCacheSet::set(unsigned int dataLength, const unsigned char *data)
{
unsigned int insertionPoint = (length_ >> 1);
unsigned int start;
if (length_ >= size_)
start = size_ - 1;
else
{
start = length_;
length_++;
}
BlockCache *save = caches_[start];
for (unsigned int k = start; k > insertionPoint; k--)
caches_[k] = caches_[k - 1];
caches_[insertionPoint] = save;
save->set(dataLength, data);
}
|
