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/* -*- c-basic-offset: 8 -*-
rdesktop: A Remote Desktop Protocol client.
Persistent Bitmap Cache routines
Copyright (C) Jeroen Meijer 2004-2007
This program 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 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 "rdesktop.h"
#define MAX_CELL_SIZE 0x1000 /* pixels */
#define IS_PERSISTENT(id) (id < 8 && g_pstcache_fd[id] > 0)
extern int g_server_depth;
extern RD_BOOL g_bitmap_cache;
extern RD_BOOL g_bitmap_cache_persist_enable;
extern RD_BOOL g_bitmap_cache_precache;
int g_pstcache_fd[8];
int g_pstcache_Bpp;
RD_BOOL g_pstcache_enumerated = False;
uint8 zero_key[] = { 0, 0, 0, 0, 0, 0, 0, 0 };
/* Update mru stamp/index for a bitmap */
void
pstcache_touch_bitmap(uint8 cache_id, uint16 cache_idx, uint32 stamp)
{
int fd;
if (!IS_PERSISTENT(cache_id) || cache_idx >= BMPCACHE2_NUM_PSTCELLS)
return;
fd = g_pstcache_fd[cache_id];
rd_lseek_file(fd, 12 + cache_idx * (g_pstcache_Bpp * MAX_CELL_SIZE + sizeof(CELLHEADER)));
rd_write_file(fd, &stamp, sizeof(stamp));
}
/* Load a bitmap from the persistent cache */
RD_BOOL
pstcache_load_bitmap(uint8 cache_id, uint16 cache_idx)
{
uint8 *celldata;
int fd;
CELLHEADER cellhdr;
RD_HBITMAP bitmap;
if (!g_bitmap_cache_persist_enable)
return False;
if (!IS_PERSISTENT(cache_id) || cache_idx >= BMPCACHE2_NUM_PSTCELLS)
return False;
fd = g_pstcache_fd[cache_id];
rd_lseek_file(fd, cache_idx * (g_pstcache_Bpp * MAX_CELL_SIZE + sizeof(CELLHEADER)));
rd_read_file(fd, &cellhdr, sizeof(CELLHEADER));
celldata = (uint8 *) xmalloc(cellhdr.length);
rd_read_file(fd, celldata, cellhdr.length);
bitmap = ui_create_bitmap(cellhdr.width, cellhdr.height, celldata);
DEBUG(("Load bitmap from disk: id=%d, idx=%d, bmp=0x%x)\n", cache_id, cache_idx, bitmap));
cache_put_bitmap(cache_id, cache_idx, bitmap);
xfree(celldata);
return True;
}
/* Store a bitmap in the persistent cache */
RD_BOOL
pstcache_save_bitmap(uint8 cache_id, uint16 cache_idx, uint8 * key,
uint8 width, uint8 height, uint16 length, uint8 * data)
{
int fd;
CELLHEADER cellhdr;
if (!IS_PERSISTENT(cache_id) || cache_idx >= BMPCACHE2_NUM_PSTCELLS)
return False;
memcpy(cellhdr.key, key, sizeof(HASH_KEY));
cellhdr.width = width;
cellhdr.height = height;
cellhdr.length = length;
cellhdr.stamp = 0;
fd = g_pstcache_fd[cache_id];
rd_lseek_file(fd, cache_idx * (g_pstcache_Bpp * MAX_CELL_SIZE + sizeof(CELLHEADER)));
rd_write_file(fd, &cellhdr, sizeof(CELLHEADER));
rd_write_file(fd, data, length);
return True;
}
/* List the bitmap keys from the persistent cache file */
int
pstcache_enumerate(uint8 id, HASH_KEY * keylist)
{
int fd, n;
uint16 idx;
sint16 mru_idx[0xa00];
uint32 mru_stamp[0xa00];
CELLHEADER cellhdr;
if (!(g_bitmap_cache && g_bitmap_cache_persist_enable && IS_PERSISTENT(id)))
return 0;
/* The server disconnects if the bitmap cache content is sent more than once */
if (g_pstcache_enumerated)
return 0;
DEBUG_RDP5(("Persistent bitmap cache enumeration... "));
for (idx = 0; idx < BMPCACHE2_NUM_PSTCELLS; idx++)
{
fd = g_pstcache_fd[id];
rd_lseek_file(fd, idx * (g_pstcache_Bpp * MAX_CELL_SIZE + sizeof(CELLHEADER)));
if (rd_read_file(fd, &cellhdr, sizeof(CELLHEADER)) <= 0)
break;
if (memcmp(cellhdr.key, zero_key, sizeof(HASH_KEY)) != 0)
{
memcpy(keylist[idx], cellhdr.key, sizeof(HASH_KEY));
/* Pre-cache (not possible for 8 bit colour depth cause it needs a colourmap) */
if (g_bitmap_cache_precache && cellhdr.stamp && g_server_depth > 8)
pstcache_load_bitmap(id, idx);
/* Sort by stamp */
for (n = idx; n > 0 && cellhdr.stamp < mru_stamp[n - 1]; n--)
{
mru_idx[n] = mru_idx[n - 1];
mru_stamp[n] = mru_stamp[n - 1];
}
mru_idx[n] = idx;
mru_stamp[n] = cellhdr.stamp;
}
else
{
break;
}
}
DEBUG_RDP5(("%d cached bitmaps.\n", idx));
cache_rebuild_bmpcache_linked_list(id, mru_idx, idx);
g_pstcache_enumerated = True;
return idx;
}
/* initialise the persistent bitmap cache */
RD_BOOL
pstcache_init(uint8 cache_id)
{
int fd;
char filename[256];
if (g_pstcache_enumerated)
return True;
g_pstcache_fd[cache_id] = 0;
if (!(g_bitmap_cache && g_bitmap_cache_persist_enable))
return False;
if (!rd_pstcache_mkdir())
{
DEBUG(("failed to get/make cache directory!\n"));
return False;
}
g_pstcache_Bpp = (g_server_depth + 7) / 8;
sprintf(filename, "cache/pstcache_%d_%d", cache_id, g_pstcache_Bpp);
DEBUG(("persistent bitmap cache file: %s\n", filename));
fd = rd_open_file(filename);
if (fd == -1)
return False;
if (!rd_lock_file(fd, 0, 0))
{
warning("Persistent bitmap caching is disabled. (The file is already in use)\n");
rd_close_file(fd);
return False;
}
g_pstcache_fd[cache_id] = fd;
return True;
}
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