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
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
|
/*
* Copyright (C) 2000 Tridia Corporation. All Rights Reserved.
* Copyright (C) 1999 AT&T Laboratories Cambridge. 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.
*/
/*
* ultrazip.c - handle ultrazip encoding.
*
* This file shouldn't be compiled directly. It is included multiple times by
* rfbproto.c, each time with a different definition of the macro BPP. For
* each value of BPP, this file defines a function which handles an zlib
* encoded rectangle with BPP bits per pixel.
*/
#define HandleUltraZipBPP CONCAT2E(HandleUltraZip,BPP)
#define HandleUltraBPP CONCAT2E(HandleUltra,BPP)
#define CARDBPP CONCAT3E(uint,BPP,_t)
static rfbBool
HandleUltraBPP (rfbClient* client, int rx, int ry, int rw, int rh)
{
rfbZlibHeader hdr;
int toRead=0;
int inflateResult=0;
lzo_uint uncompressedBytes = (( rw * rh ) * ( BPP / 8 ));
if (!ReadFromRFBServer(client, (char *)&hdr, sz_rfbZlibHeader))
return FALSE;
toRead = rfbClientSwap32IfLE(hdr.nBytes);
if (toRead==0) return TRUE;
if (uncompressedBytes==0)
{
rfbClientLog("ultra error: rectangle has 0 uncomressed bytes ((%dw * %dh) * (%d / 8))\n", rw, rh, BPP);
return FALSE;
}
/* First make sure we have a large enough raw buffer to hold the
* decompressed data. In practice, with a fixed BPP, fixed frame
* buffer size and the first update containing the entire frame
* buffer, this buffer allocation should only happen once, on the
* first update.
*/
if ( client->raw_buffer_size < (int)uncompressedBytes) {
if ( client->raw_buffer != NULL ) {
free( client->raw_buffer );
}
client->raw_buffer_size = uncompressedBytes;
/* buffer needs to be aligned on 4-byte boundaries */
if ((client->raw_buffer_size % 4)!=0)
client->raw_buffer_size += (4-(client->raw_buffer_size % 4));
client->raw_buffer = (char*) malloc( client->raw_buffer_size );
}
/* allocate enough space to store the incoming compressed packet */
if ( client->ultra_buffer_size < toRead ) {
if ( client->ultra_buffer != NULL ) {
free( client->ultra_buffer );
}
client->ultra_buffer_size = toRead;
/* buffer needs to be aligned on 4-byte boundaries */
if ((client->ultra_buffer_size % 4)!=0)
client->ultra_buffer_size += (4-(client->ultra_buffer_size % 4));
client->ultra_buffer = (char*) malloc( client->ultra_buffer_size );
}
/* Fill the buffer, obtaining data from the server. */
if (!ReadFromRFBServer(client, client->ultra_buffer, toRead))
return FALSE;
/* uncompress the data */
uncompressedBytes = client->raw_buffer_size;
inflateResult = lzo1x_decompress_safe(
(lzo_byte *)client->ultra_buffer, toRead,
(lzo_byte *)client->raw_buffer, (lzo_uintp) &uncompressedBytes,
NULL);
/* Note that uncompressedBytes will be 0 on output overrun */
if ((rw * rh * (BPP / 8)) != uncompressedBytes)
rfbClientLog("Ultra decompressed unexpected amount of data (%d != %d)\n", (rw * rh * (BPP / 8)), uncompressedBytes);
/* Put the uncompressed contents of the update on the screen. */
if ( inflateResult == LZO_E_OK )
{
client->GotBitmap(client, (unsigned char *)client->raw_buffer, rx, ry, rw, rh);
}
else
{
rfbClientLog("ultra decompress returned error: %d\n",
inflateResult);
return FALSE;
}
return TRUE;
}
/* UltraZip is like rre in that it is composed of subrects */
static rfbBool
HandleUltraZipBPP (rfbClient* client, int rx, int ry, int rw, int rh)
{
rfbZlibHeader hdr;
int i=0;
int toRead=0;
int inflateResult=0;
unsigned char *ptr=NULL;
lzo_uint uncompressedBytes = ry + (rw * 65535);
unsigned int numCacheRects = rx;
if (!ReadFromRFBServer(client, (char *)&hdr, sz_rfbZlibHeader))
return FALSE;
toRead = rfbClientSwap32IfLE(hdr.nBytes);
if (toRead==0) return TRUE;
if (uncompressedBytes==0)
{
rfbClientLog("ultrazip error: rectangle has 0 uncomressed bytes (%dy + (%dw * 65535)) (%d rectangles)\n", ry, rw, rx);
return FALSE;
}
/* First make sure we have a large enough raw buffer to hold the
* decompressed data. In practice, with a fixed BPP, fixed frame
* buffer size and the first update containing the entire frame
* buffer, this buffer allocation should only happen once, on the
* first update.
*/
if ( client->raw_buffer_size < (int)(uncompressedBytes + 500)) {
if ( client->raw_buffer != NULL ) {
free( client->raw_buffer );
}
client->raw_buffer_size = uncompressedBytes + 500;
/* buffer needs to be aligned on 4-byte boundaries */
if ((client->raw_buffer_size % 4)!=0)
client->raw_buffer_size += (4-(client->raw_buffer_size % 4));
client->raw_buffer = (char*) malloc( client->raw_buffer_size );
}
/* allocate enough space to store the incoming compressed packet */
if ( client->ultra_buffer_size < toRead ) {
if ( client->ultra_buffer != NULL ) {
free( client->ultra_buffer );
}
client->ultra_buffer_size = toRead;
client->ultra_buffer = (char*) malloc( client->ultra_buffer_size );
}
/* Fill the buffer, obtaining data from the server. */
if (!ReadFromRFBServer(client, client->ultra_buffer, toRead))
return FALSE;
/* uncompress the data */
uncompressedBytes = client->raw_buffer_size;
inflateResult = lzo1x_decompress_safe(
(lzo_byte *)client->ultra_buffer, toRead,
(lzo_byte *)client->raw_buffer, &uncompressedBytes, NULL);
if ( inflateResult != LZO_E_OK )
{
rfbClientLog("ultra decompress returned error: %d\n",
inflateResult);
return FALSE;
}
/* Put the uncompressed contents of the update on the screen. */
ptr = (unsigned char *)client->raw_buffer;
for (i=0; i<numCacheRects; i++)
{
unsigned short sx, sy, sw, sh;
unsigned int se;
memcpy((char *)&sx, ptr, 2); ptr += 2;
memcpy((char *)&sy, ptr, 2); ptr += 2;
memcpy((char *)&sw, ptr, 2); ptr += 2;
memcpy((char *)&sh, ptr, 2); ptr += 2;
memcpy((char *)&se, ptr, 4); ptr += 4;
sx = rfbClientSwap16IfLE(sx);
sy = rfbClientSwap16IfLE(sy);
sw = rfbClientSwap16IfLE(sw);
sh = rfbClientSwap16IfLE(sh);
se = rfbClientSwap32IfLE(se);
if (se == rfbEncodingRaw)
{
client->GotBitmap(client, (unsigned char *)ptr, sx, sy, sw, sh);
ptr += ((sw * sh) * (BPP / 8));
}
}
return TRUE;
}
#undef CARDBPP
|
