added files from rdesktop

1 files changed, 200 insertions, 0 deletions

diff --git a/uirdesktop/pstcache.c b/uirdesktop/pstcache.c
new file mode 100644
index 00000000..9e6432bd
--- /dev/null
+++ b/uirdesktop/pstcache.c
@@ -0,0 +1,200 @@
+/* -*- c-basic-offset: 8 -*-
+   rdesktop: A Remote Desktop Protocol client.
+   Persistent Bitmap Cache routines
+   Copyright (C) Jeroen Meijer 2004-2005
+
+   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 BOOL g_bitmap_cache;
+extern BOOL g_bitmap_cache_persist_enable;
+extern BOOL g_bitmap_cache_precache;
+
+int g_pstcache_fd[8];
+int g_pstcache_Bpp;
+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 */
+BOOL
+pstcache_load_bitmap(uint8 cache_id, uint16 cache_idx)
+{
+	uint8 *celldata;
+	int fd;
+	CELLHEADER cellhdr;
+	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 */
+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 */
+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;
+}