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200 lines
5.2 KiB
C
200 lines
5.2 KiB
C
/* -*- c-basic-offset: 8 -*-
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rdesktop: A Remote Desktop Protocol client.
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Persistent Bitmap Cache routines
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Copyright (C) Jeroen Meijer <jeroen@oldambt7.com> 2004-2008
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "precomp.h"
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#define MAX_CELL_SIZE 0x1000 /* pixels */
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#define IS_PERSISTENT(id) (id < 8 && g_pstcache_fd[id] > 0)
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extern int g_server_depth;
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extern RD_BOOL g_bitmap_cache;
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extern RD_BOOL g_bitmap_cache_persist_enable;
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extern RD_BOOL g_bitmap_cache_precache;
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int g_pstcache_fd[8];
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int g_pstcache_Bpp;
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RD_BOOL g_pstcache_enumerated = False;
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uint8 zero_key[] = { 0, 0, 0, 0, 0, 0, 0, 0 };
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/* Update mru stamp/index for a bitmap */
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void
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pstcache_touch_bitmap(uint8 cache_id, uint16 cache_idx, uint32 stamp)
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{
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int fd;
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if (!IS_PERSISTENT(cache_id) || cache_idx >= BMPCACHE2_NUM_PSTCELLS)
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return;
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fd = g_pstcache_fd[cache_id];
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rd_lseek_file(fd, 12 + cache_idx * (g_pstcache_Bpp * MAX_CELL_SIZE + sizeof(CELLHEADER)));
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rd_write_file(fd, &stamp, sizeof(stamp));
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}
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/* Load a bitmap from the persistent cache */
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RD_BOOL
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pstcache_load_bitmap(uint8 cache_id, uint16 cache_idx)
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{
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uint8 *celldata;
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int fd;
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CELLHEADER cellhdr;
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RD_HBITMAP bitmap;
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if (!g_bitmap_cache_persist_enable)
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return False;
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if (!IS_PERSISTENT(cache_id) || cache_idx >= BMPCACHE2_NUM_PSTCELLS)
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return False;
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fd = g_pstcache_fd[cache_id];
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rd_lseek_file(fd, cache_idx * (g_pstcache_Bpp * MAX_CELL_SIZE + sizeof(CELLHEADER)));
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rd_read_file(fd, &cellhdr, sizeof(CELLHEADER));
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celldata = (uint8 *) xmalloc(cellhdr.length);
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rd_read_file(fd, celldata, cellhdr.length);
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bitmap = ui_create_bitmap(cellhdr.width, cellhdr.height, celldata);
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DEBUG(("Load bitmap from disk: id=%d, idx=%d, bmp=%p)\n", cache_id, cache_idx, bitmap));
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cache_put_bitmap(cache_id, cache_idx, bitmap);
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xfree(celldata);
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return True;
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}
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/* Store a bitmap in the persistent cache */
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RD_BOOL
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pstcache_save_bitmap(uint8 cache_id, uint16 cache_idx, uint8 * key,
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uint8 width, uint8 height, uint16 length, uint8 * data)
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{
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int fd;
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CELLHEADER cellhdr;
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if (!IS_PERSISTENT(cache_id) || cache_idx >= BMPCACHE2_NUM_PSTCELLS)
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return False;
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memcpy(cellhdr.key, key, sizeof(HASH_KEY));
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cellhdr.width = width;
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cellhdr.height = height;
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cellhdr.length = length;
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cellhdr.stamp = 0;
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fd = g_pstcache_fd[cache_id];
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rd_lseek_file(fd, cache_idx * (g_pstcache_Bpp * MAX_CELL_SIZE + sizeof(CELLHEADER)));
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rd_write_file(fd, &cellhdr, sizeof(CELLHEADER));
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rd_write_file(fd, data, length);
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return True;
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}
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/* List the bitmap keys from the persistent cache file */
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int
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pstcache_enumerate(uint8 id, HASH_KEY * keylist)
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{
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int fd, n;
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uint16 idx;
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sint16 mru_idx[0xa00];
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uint32 mru_stamp[0xa00];
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CELLHEADER cellhdr;
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if (!(g_bitmap_cache && g_bitmap_cache_persist_enable && IS_PERSISTENT(id)))
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return 0;
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/* The server disconnects if the bitmap cache content is sent more than once */
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if (g_pstcache_enumerated)
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return 0;
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DEBUG_RDP5(("Persistent bitmap cache enumeration... "));
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for (idx = 0; idx < BMPCACHE2_NUM_PSTCELLS; idx++)
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{
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fd = g_pstcache_fd[id];
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rd_lseek_file(fd, idx * (g_pstcache_Bpp * MAX_CELL_SIZE + sizeof(CELLHEADER)));
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if (rd_read_file(fd, &cellhdr, sizeof(CELLHEADER)) <= 0)
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break;
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if (memcmp(cellhdr.key, zero_key, sizeof(HASH_KEY)) != 0)
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{
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memcpy(keylist[idx], cellhdr.key, sizeof(HASH_KEY));
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/* Pre-cache (not possible for 8 bit colour depth cause it needs a colourmap) */
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if (g_bitmap_cache_precache && cellhdr.stamp && g_server_depth > 8)
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pstcache_load_bitmap(id, idx);
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/* Sort by stamp */
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for (n = idx; n > 0 && cellhdr.stamp < mru_stamp[n - 1]; n--)
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{
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mru_idx[n] = mru_idx[n - 1];
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mru_stamp[n] = mru_stamp[n - 1];
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}
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mru_idx[n] = idx;
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mru_stamp[n] = cellhdr.stamp;
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}
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else
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{
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break;
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}
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}
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DEBUG_RDP5(("%d cached bitmaps.\n", idx));
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cache_rebuild_bmpcache_linked_list(id, mru_idx, idx);
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g_pstcache_enumerated = True;
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return idx;
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}
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/* initialise the persistent bitmap cache */
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RD_BOOL
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pstcache_init(uint8 cache_id)
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{
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int fd;
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char filename[256];
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if (g_pstcache_enumerated)
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return True;
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g_pstcache_fd[cache_id] = 0;
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if (!(g_bitmap_cache && g_bitmap_cache_persist_enable))
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return False;
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if (!rd_pstcache_mkdir())
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{
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DEBUG(("failed to get/make cache directory!\n"));
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return False;
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}
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g_pstcache_Bpp = (g_server_depth + 7) / 8;
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sprintf(filename, "cache/pstcache_%d_%d", cache_id, g_pstcache_Bpp);
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DEBUG(("persistent bitmap cache file: %s\n", filename));
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fd = rd_open_file(filename);
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if (fd == -1)
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return False;
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if (!rd_lock_file(fd, 0, 0))
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{
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warning("Persistent bitmap caching is disabled. (The file is already in use)\n");
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rd_close_file(fd);
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return False;
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}
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g_pstcache_fd[cache_id] = fd;
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return True;
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}
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