Updated to final KDE3 ktorrent release (2.2.6)

git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/applications/ktorrent@1077377 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

1 files changed, 149 insertions, 0 deletions

diff --git a/libktorrent/torrent/cachefile.h b/libktorrent/torrent/cachefile.h
new file mode 100644
index 0000000..9c4ebc6
--- /dev/null
+++ b/libktorrent/torrent/cachefile.h
@@ -0,0 +1,149 @@
+/***************************************************************************
+ *   Copyright (C) 2005 by Joris Guisson                                   *
+ *   joris.guisson@gmail.com                                               *
+ *                                                                         *
+ *   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.,                                       *
+ *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.             *
+ ***************************************************************************/
+#ifndef BTCACHEFILE_H
+#define BTCACHEFILE_H
+
+#include <qmap.h>
+#include <qmutex.h>
+#include <qstring.h>
+#include <util/constants.h>
+
+namespace bt
+{
+	class PreallocationThread;
+
+	
+	/**
+	 * Interface which classes must implement to be able to map something from a CacheFile
+	 * It will also be used to notify when things get unmapped or remapped
+	*/
+	class MMappeable
+	{
+	public:
+		virtual ~MMappeable() {}
+
+		/**
+		 * When a CacheFile is closed, this will be called on all existing mappings.
+		 */
+		virtual void unmapped() = 0;
+	};
+
+	/**
+		@author Joris Guisson <joris.guisson@gmail.com>
+		
+		Used by Single and MultiFileCache to write to disk.
+	*/
+	class CacheFile
+	{
+	public:
+		CacheFile();
+		virtual ~CacheFile();
+		
+		enum Mode
+		{
+			READ,WRITE,RW
+		};
+
+		
+		/**
+		 * Open the file.
+		 * @param path Path of the file
+		 * @param size Max size of the file
+		 * @throw Error when something goes wrong
+		 */
+		void open(const QString & path,Uint64 size);
+		
+		/// Change the path of the file
+		void changePath(const QString & npath);
+		
+		/**
+		 * Map a part of the file into memory, will expand the file
+		 * if it is to small, but will not go past the limit set in open.
+		 * @param thing The thing that wishes to map the mmapping
+		 * @param off Offset into the file
+		 * @param size Size of the region to map
+		 * @param mode How the region will be mapped
+		 * @return A ptr to the mmaped region, or 0 if something goes wrong
+		 */
+		void* map(MMappeable* thing,Uint64 off,Uint32 size,Mode mode);
+		
+		/**
+		 * Unmap a previously mapped region.
+		 * @param ptr Ptr to the region
+		 * @param size Size of the region
+		 */
+		void unmap(void* ptr,Uint32 size);
+		
+		/**
+		 * Close the file, everything will be unmapped.
+		 * @param to_be_reopened Indicates if the close is temporarely (i.e. it will be reopened)
+		 */
+		void close();
+		
+		/**
+		 * Read from the file.
+		 * @param buf Buffer to store data
+		 * @param size Size to read
+		 * @param off Offset to read from in file
+		 */
+		void read(Uint8* buf,Uint32 size,Uint64 off);
+		
+		/**
+		 * Write to the file.
+		 * @param buf Buffer to write
+		 * @param size Size to read
+		 * @param off Offset to read from in file
+		 */
+		void write(const Uint8* buf,Uint32 size,Uint64 off);
+		
+		/**
+		 * Preallocate disk space
+		 */
+		void preallocate(PreallocationThread* prealloc);
+
+		/// Get the number of bytes this cache file is taking up
+		Uint64 diskUsage();
+		
+	private:
+		void growFile(Uint64 to_write);
+		void closeTemporary();
+		void openFile(Mode mode);
+		
+	private:
+		int fd;
+		bool read_only;
+		Uint64 max_size,file_size;
+		QString path;
+		struct Entry
+		{
+			MMappeable* thing;
+			void* ptr;
+			Uint32 size;
+			Uint64 offset;
+			Uint32 diff;
+			Mode mode;
+		};
+		QMap<void*,Entry> mappings; // mappings where offset wasn't a multiple of 4K
+		mutable QMutex mutex;
+	};
+
+}
+
+#endif