VirtualBox

source: vbox/trunk/src/VBox/RDP/client/pstcache.c@ 17039

Last change on this file since 17039 was 11982, checked in by vboxsync, 16 years ago

All: license header changes for 2.0 (OSE headers, add Sun GPL/LGPL disclaimer)

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 5.7 KB
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1/* -*- c-basic-offset: 8 -*-
2 rdesktop: A Remote Desktop Protocol client.
3 Persistent Bitmap Cache routines
4 Copyright (C) Jeroen Meijer 2004-2007
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19*/
20
21/*
22 * Sun GPL Disclaimer: For the avoidance of doubt, except that if any license choice
23 * other than GPL or LGPL is available it will apply instead, Sun elects to use only
24 * the General Public License version 2 (GPLv2) at this time for any software where
25 * a choice of GPL license versions is made available with the language indicating
26 * that GPLv2 or any later version may be used, or where a choice of which version
27 * of the GPL is applied is otherwise unspecified.
28 */
29
30#include "rdesktop.h"
31
32#define MAX_CELL_SIZE 0x1000 /* pixels */
33
34#define IS_PERSISTENT(id) (id < 8 && g_pstcache_fd[id] > 0)
35
36extern int g_server_depth;
37extern RD_BOOL g_bitmap_cache;
38extern RD_BOOL g_bitmap_cache_persist_enable;
39extern RD_BOOL g_bitmap_cache_precache;
40
41int g_pstcache_fd[8];
42int g_pstcache_Bpp;
43RD_BOOL g_pstcache_enumerated = False;
44uint8 zero_key[] = { 0, 0, 0, 0, 0, 0, 0, 0 };
45
46
47/* Update mru stamp/index for a bitmap */
48void
49pstcache_touch_bitmap(uint8 cache_id, uint16 cache_idx, uint32 stamp)
50{
51 int fd;
52
53 if (!IS_PERSISTENT(cache_id) || cache_idx >= BMPCACHE2_NUM_PSTCELLS)
54 return;
55
56 fd = g_pstcache_fd[cache_id];
57 rd_lseek_file(fd, 12 + cache_idx * (g_pstcache_Bpp * MAX_CELL_SIZE + sizeof(CELLHEADER)));
58 rd_write_file(fd, &stamp, sizeof(stamp));
59}
60
61/* Load a bitmap from the persistent cache */
62RD_BOOL
63pstcache_load_bitmap(uint8 cache_id, uint16 cache_idx)
64{
65 uint8 *celldata;
66 int fd;
67 CELLHEADER cellhdr;
68 RD_HBITMAP bitmap;
69
70 if (!g_bitmap_cache_persist_enable)
71 return False;
72
73 if (!IS_PERSISTENT(cache_id) || cache_idx >= BMPCACHE2_NUM_PSTCELLS)
74 return False;
75
76 fd = g_pstcache_fd[cache_id];
77 rd_lseek_file(fd, cache_idx * (g_pstcache_Bpp * MAX_CELL_SIZE + sizeof(CELLHEADER)));
78 rd_read_file(fd, &cellhdr, sizeof(CELLHEADER));
79 celldata = (uint8 *) xmalloc(cellhdr.length);
80 rd_read_file(fd, celldata, cellhdr.length);
81
82 bitmap = ui_create_bitmap(cellhdr.width, cellhdr.height, celldata);
83 DEBUG(("Load bitmap from disk: id=%d, idx=%d, bmp=0x%x)\n", cache_id, cache_idx, bitmap));
84 cache_put_bitmap(cache_id, cache_idx, bitmap);
85
86 xfree(celldata);
87 return True;
88}
89
90/* Store a bitmap in the persistent cache */
91RD_BOOL
92pstcache_save_bitmap(uint8 cache_id, uint16 cache_idx, uint8 * key,
93 uint8 width, uint8 height, uint16 length, uint8 * data)
94{
95 int fd;
96 CELLHEADER cellhdr;
97
98 if (!IS_PERSISTENT(cache_id) || cache_idx >= BMPCACHE2_NUM_PSTCELLS)
99 return False;
100
101 memcpy(cellhdr.key, key, sizeof(HASH_KEY));
102 cellhdr.width = width;
103 cellhdr.height = height;
104 cellhdr.length = length;
105 cellhdr.stamp = 0;
106
107 fd = g_pstcache_fd[cache_id];
108 rd_lseek_file(fd, cache_idx * (g_pstcache_Bpp * MAX_CELL_SIZE + sizeof(CELLHEADER)));
109 rd_write_file(fd, &cellhdr, sizeof(CELLHEADER));
110 rd_write_file(fd, data, length);
111
112 return True;
113}
114
115/* List the bitmap keys from the persistent cache file */
116int
117pstcache_enumerate(uint8 id, HASH_KEY * keylist)
118{
119 int fd, n;
120 uint16 idx;
121 sint16 mru_idx[0xa00];
122 uint32 mru_stamp[0xa00];
123 CELLHEADER cellhdr;
124
125 if (!(g_bitmap_cache && g_bitmap_cache_persist_enable && IS_PERSISTENT(id)))
126 return 0;
127
128 /* The server disconnects if the bitmap cache content is sent more than once */
129 if (g_pstcache_enumerated)
130 return 0;
131
132 DEBUG_RDP5(("Persistent bitmap cache enumeration... "));
133 for (idx = 0; idx < BMPCACHE2_NUM_PSTCELLS; idx++)
134 {
135 fd = g_pstcache_fd[id];
136 rd_lseek_file(fd, idx * (g_pstcache_Bpp * MAX_CELL_SIZE + sizeof(CELLHEADER)));
137 if (rd_read_file(fd, &cellhdr, sizeof(CELLHEADER)) <= 0)
138 break;
139
140 if (memcmp(cellhdr.key, zero_key, sizeof(HASH_KEY)) != 0)
141 {
142 memcpy(keylist[idx], cellhdr.key, sizeof(HASH_KEY));
143
144 /* Pre-cache (not possible for 8 bit colour depth cause it needs a colourmap) */
145 if (g_bitmap_cache_precache && cellhdr.stamp && g_server_depth > 8)
146 pstcache_load_bitmap(id, idx);
147
148 /* Sort by stamp */
149 for (n = idx; n > 0 && cellhdr.stamp < mru_stamp[n - 1]; n--)
150 {
151 mru_idx[n] = mru_idx[n - 1];
152 mru_stamp[n] = mru_stamp[n - 1];
153 }
154
155 mru_idx[n] = idx;
156 mru_stamp[n] = cellhdr.stamp;
157 }
158 else
159 {
160 break;
161 }
162 }
163
164 DEBUG_RDP5(("%d cached bitmaps.\n", idx));
165
166 cache_rebuild_bmpcache_linked_list(id, mru_idx, idx);
167 g_pstcache_enumerated = True;
168 return idx;
169}
170
171/* initialise the persistent bitmap cache */
172RD_BOOL
173pstcache_init(uint8 cache_id)
174{
175 int fd;
176 char filename[256];
177
178 if (g_pstcache_enumerated)
179 return True;
180
181 g_pstcache_fd[cache_id] = 0;
182
183 if (!(g_bitmap_cache && g_bitmap_cache_persist_enable))
184 return False;
185
186 if (!rd_pstcache_mkdir())
187 {
188 DEBUG(("failed to get/make cache directory!\n"));
189 return False;
190 }
191
192 g_pstcache_Bpp = (g_server_depth + 7) / 8;
193 sprintf(filename, "cache/pstcache_%d_%d", cache_id, g_pstcache_Bpp);
194 DEBUG(("persistent bitmap cache file: %s\n", filename));
195
196 fd = rd_open_file(filename);
197 if (fd == -1)
198 return False;
199
200 if (!rd_lock_file(fd, 0, 0))
201 {
202 warning("Persistent bitmap caching is disabled. (The file is already in use)\n");
203 rd_close_file(fd);
204 return False;
205 }
206
207 g_pstcache_fd[cache_id] = fd;
208 return True;
209}
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