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/* -*- 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 2004-2008 |
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|
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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 2 of the License, or |
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(at your option) any later version. |
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|
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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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|
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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, write to the Free Software |
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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*/ |
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|
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#include "rdesktop.h" |
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|
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#define MAX_CELL_SIZE 0x1000 /* pixels */ |
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|
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#define IS_PERSISTENT(id) (id < 8 && g_pstcache_fd[id] > 0) |
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|
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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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|
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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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|
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|
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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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|
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if (!IS_PERSISTENT(cache_id) || cache_idx >= BMPCACHE2_NUM_PSTCELLS) |
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return; |
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|
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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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|
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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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|
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if (!g_bitmap_cache_persist_enable) |
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return False; |
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|
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if (!IS_PERSISTENT(cache_id) || cache_idx >= BMPCACHE2_NUM_PSTCELLS) |
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return False; |
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|
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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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|
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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=0x%x)\n", cache_id, cache_idx, |
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(unsigned int) bitmap)); |
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cache_put_bitmap(cache_id, cache_idx, bitmap); |
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|
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xfree(celldata); |
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return True; |
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} |
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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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|
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if (!IS_PERSISTENT(cache_id) || cache_idx >= BMPCACHE2_NUM_PSTCELLS) |
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return False; |
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|
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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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|
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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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|
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return True; |
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} |
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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DEBUG_RDP5(("%d cached bitmaps.\n", idx)); |
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|
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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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|
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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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|
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if (g_pstcache_enumerated) |
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return True; |
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|
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g_pstcache_fd[cache_id] = 0; |
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|
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if (!(g_bitmap_cache && g_bitmap_cache_persist_enable)) |
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return False; |
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|
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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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|
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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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|
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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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|
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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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|
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g_pstcache_fd[cache_id] = fd; |
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return True; |
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} |