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
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
|
/*
* HT Editor
* cstream.cc
*
* Copyright (C) 1999-2002 Sebastian Biallas (sb@biallas.net)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program 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 program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "cstream.h"
#include "htdebug.h"
#include "except.h"
#include "endianess.h"
# ifdef USE_MINILZO
# include "minilzo/minilzo.h"
# elif HAVE_LZO_LZO1X_H
# include <lzo/lzo1x.h>
# elif HAVE_LZO1X_H
# include <lzo1x.h>
# endif
#include "tools.h"
#include <string.h>
CompressedStream::CompressedStream(Stream *stream, bool own_stream)
: StreamLayer(stream, own_stream)
{
if ((stream->getAccessMode() & (IOAM_READ | IOAM_WRITE)) == (IOAM_READ | IOAM_WRITE)) {
// ht_compressed_stream cant be used for read and write access simultaneously
assert(0);
}
bufferpos = 0;
buffersize = COMPRESSED_STREAM_DEFAULT_GRANULARITY;
buffer = ht_malloc(buffersize);
}
CompressedStream::~CompressedStream()
{
if (getAccessMode() & IOAM_WRITE) {
flush_compressed();
}
free(buffer);
}
void CompressedStream::flush_compressed()
{
if (bufferpos) {
byte cbuf[bufferpos + bufferpos / 64 + 16 + 3];
byte workbuf[LZO1X_1_MEM_COMPRESS];
lzo_uint cbuf_len;
byte n[4];
memset(workbuf, 0, sizeof workbuf);
lzo1x_1_compress(buffer, bufferpos, cbuf, &cbuf_len, workbuf);
createForeignInt(n, bufferpos, 4, big_endian);
mStream->writex(n, 4);
createForeignInt(n, cbuf_len, 4, big_endian);
mStream->writex(n, 4);
mStream->writex(cbuf, cbuf_len);
bufferpos = 0;
}
}
void CompressedStream::flush_uncompressed()
{
if (bufferpos == 0) {
free(buffer);
buffer = NULL;
uint cbuf_len;
uint uncompressed_len;
byte n[4];
mStream->readx(n, 4);
uncompressed_len = createHostInt(n, 4, big_endian);
mStream->readx(n, 4);
cbuf_len = createHostInt(n, 4, big_endian);
if (!uncompressed_len || uncompressed_len > COMPRESSED_STREAM_DEFAULT_GRANULARITY
|| !cbuf_len || cbuf_len > 2*COMPRESSED_STREAM_DEFAULT_GRANULARITY) throw IOException(EIO);
buffer = ht_malloc(uncompressed_len);
byte cbuf[cbuf_len];
mStream->readx(cbuf, cbuf_len);
lzo_uint dummy = uncompressed_len;
lzo1x_decompress_safe(cbuf, cbuf_len, buffer, &dummy, NULL);
if (dummy != uncompressed_len) throw IOException(EIO);
buffersize = uncompressed_len;
bufferpos = uncompressed_len;
}
}
uint CompressedStream::read(void *aBuf, uint size)
{
uint ssize = size;
byte *buf = (byte *)aBuf;
while (size >= bufferpos) {
memcpy(buf, buffer+buffersize-bufferpos, bufferpos);
buf += bufferpos;
size -= bufferpos;
bufferpos = 0;
if (size) {
try {
flush_uncompressed();
} catch (const EOFException &) {
return ssize - size;
}
} else break;
}
if (size) {
memcpy(buf, buffer+buffersize-bufferpos, size);
bufferpos -= size;
}
return ssize;
}
uint CompressedStream::write(const void *aBuf, uint size)
{
uint ssize = size;
const byte *buf = (const byte *)aBuf;
while (bufferpos+size >= buffersize) {
memcpy(buffer+bufferpos, buf, buffersize-bufferpos);
size -= buffersize-bufferpos;
buf += buffersize-bufferpos;
bufferpos = buffersize;
if (size) {
try {
flush_compressed();
} catch (const EOFException &) {
return ssize - size;
}
} else break;
}
if (size) {
memcpy(buffer+bufferpos, buf, size);
bufferpos += size;
}
return ssize;
}
|
