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
136
137
138
139
140
|
//
// Copyright (C) 2002 RealVNC Ltd. All Rights Reserved.
//
// This is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This software 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this software; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.
#include <rdr/ZlibOutStream.h>
#include <rdr/Exception.h>
#include <zlib.h>
using namespace rdr;
enum { DEFAULT_BUF_SIZE = 16384 };
ZlibOutStream::ZlibOutStream(OutStream* os, int bufSize_)
: underlying(os), bufSize(bufSize_ ? bufSize_ : DEFAULT_BUF_SIZE), offset(0)
{
zs = new z_stream;
zs->zalloc = Z_NULL;
zs->zfree = Z_NULL;
zs->opaque = Z_NULL;
if (deflateInit(zs, Z_DEFAULT_COMPRESSION) != Z_OK) {
delete zs;
throw Exception("ZlibOutStream: deflateInit failed");
}
ptr = start = new U8[bufSize];
end = start + bufSize;
}
ZlibOutStream::~ZlibOutStream()
{
try {
flush();
} catch (Exception&) {
}
delete [] start;
deflateEnd(zs);
delete zs;
}
void ZlibOutStream::setUnderlying(OutStream* os)
{
underlying = os;
}
int ZlibOutStream::length()
{
return offset + ptr - start;
}
void ZlibOutStream::flush()
{
zs->next_in = start;
zs->avail_in = ptr - start;
// fprintf(stderr,"zos flush: avail_in %d\n",zs->avail_in);
while (zs->avail_in != 0) {
do {
underlying->check(1);
zs->next_out = underlying->getptr();
zs->avail_out = underlying->getend() - underlying->getptr();
// fprintf(stderr,"zos flush: calling deflate, avail_in %d, avail_out %d\n",
// zs->avail_in,zs->avail_out);
int rc = deflate(zs, Z_SYNC_FLUSH);
if (rc != Z_OK) throw Exception("ZlibOutStream: deflate failed");
// fprintf(stderr,"zos flush: after deflate: %d bytes\n",
// zs->next_out-underlying->getptr());
underlying->setptr(zs->next_out);
} while (zs->avail_out == 0);
}
offset += ptr - start;
ptr = start;
}
int ZlibOutStream::overrun(int itemSize, int nItems)
{
// fprintf(stderr,"ZlibOutStream overrun\n");
if (itemSize > bufSize)
throw Exception("ZlibOutStream overrun: max itemSize exceeded");
while (end - ptr < itemSize) {
zs->next_in = start;
zs->avail_in = ptr - start;
do {
underlying->check(1);
zs->next_out = underlying->getptr();
zs->avail_out = underlying->getend() - underlying->getptr();
// fprintf(stderr,"zos overrun: calling deflate, avail_in %d, avail_out %d\n",
// zs->avail_in,zs->avail_out);
int rc = deflate(zs, 0);
if (rc != Z_OK) throw Exception("ZlibOutStream: deflate failed");
// fprintf(stderr,"zos overrun: after deflate: %d bytes\n",
// zs->next_out-underlying->getptr());
underlying->setptr(zs->next_out);
} while (zs->avail_out == 0);
// output buffer not full
if (zs->avail_in == 0) {
offset += ptr - start;
ptr = start;
} else {
// but didn't consume all the data? try shifting what's left to the
// start of the buffer.
fprintf(stderr,"z out buf not full, but in data not consumed\n");
memmove(start, zs->next_in, ptr - zs->next_in);
offset += zs->next_in - start;
ptr -= zs->next_in - start;
}
}
if (itemSize * nItems > end - ptr)
nItems = (end - ptr) / itemSize;
return nItems;
}
|
