Second Life viewer sources 1.13.2.12

1 files changed, 170 insertions, 0 deletions

diff --git a/linden/indra/llvfs/llvfs.h b/linden/indra/llvfs/llvfs.h
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+/** 
+ * @file llvfs.h
+ * @brief Definition of virtual file system
+ *
+ * Copyright (c) 2002-2007, Linden Research, Inc.
+ * 
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlife.com/developers/opensource/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at http://secondlife.com/developers/opensource/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ */
+
+#ifndef LL_LLVFS_H
+#define LL_LLVFS_H
+
+#include <stdio.h>
+#include <map>
+#include <deque>
+#include "lluuid.h"
+#include "linked_lists.h"
+#include "llassettype.h"
+#include "llthread.h"
+
+enum EVFSValid 
+{
+        VFSVALID_UNKNOWN = 0, 
+        VFSVALID_OK = 1,
+        VFSVALID_BAD_CORRUPT = 2,
+        VFSVALID_BAD_CANNOT_OPEN_READONLY = 3,
+        VFSVALID_BAD_CANNOT_CREATE = 4
+};
+
+// Lock types for open vfiles, pending async reads, and pending async appends
+// (There are no async normal writes, currently)
+enum EVFSLock
+{
+        VFSLOCK_OPEN = 0,
+        VFSLOCK_READ = 1,
+        VFSLOCK_APPEND = 2,
+
+        VFSLOCK_COUNT = 3
+};
+
+// internal classes
+class LLVFSBlock;
+class LLVFSFileBlock;
+class LLVFSFileSpecifier
+{
+public:
+        LLVFSFileSpecifier();
+        LLVFSFileSpecifier(const LLUUID &file_id, const LLAssetType::EType file_type);
+        bool operator<(const LLVFSFileSpecifier &rhs) const;
+        bool operator==(const LLVFSFileSpecifier &rhs) const;
+
+public:
+        LLUUID mFileID;
+        LLAssetType::EType mFileType;
+};
+
+class LLVFS
+{
+public:
+        // Pass 0 to not presize
+        LLVFS(const char *index_filename, const char *data_filename, const BOOL read_only, const U32 presize, const BOOL remove_after_crash);
+        ~LLVFS();
+
+        BOOL isValid() const                    { return (VFSVALID_OK == mValid); }
+        EVFSValid getValidState() const { return mValid; }
+
+        // ---------- The following fucntions lock/unlock mDataMutex ----------
+        BOOL getExists(const LLUUID &file_id, const LLAssetType::EType file_type);
+        S32      getSize(const LLUUID &file_id, const LLAssetType::EType file_type);
+
+        BOOL checkAvailable(S32 max_size);
+        
+        S32  getMaxSize(const LLUUID &file_id, const LLAssetType::EType file_type);
+        BOOL setMaxSize(const LLUUID &file_id, const LLAssetType::EType file_type, S32 max_size);
+
+        void renameFile(const LLUUID &file_id, const LLAssetType::EType file_type,
+                const LLUUID &new_id, const LLAssetType::EType &new_type);
+        void removeFile(const LLUUID &file_id, const LLAssetType::EType file_type);
+
+        S32 getData(const LLUUID &file_id, const LLAssetType::EType file_type, U8 *buffer, S32 location, S32 length);
+        S32 storeData(const LLUUID &file_id, const LLAssetType::EType file_type, const U8 *buffer, S32 location, S32 length);
+
+        void incLock(const LLUUID &file_id, const LLAssetType::EType file_type, EVFSLock lock);
+        void decLock(const LLUUID &file_id, const LLAssetType::EType file_type, EVFSLock lock);
+        BOOL isLocked(const LLUUID &file_id, const LLAssetType::EType file_type, EVFSLock lock);
+        // ----------------------------------------------------------------
+
+        // Used to trigger evil WinXP behavior of "preloading" entire file into memory.
+        void pokeFiles();
+
+        // Verify that the index file contents match the in-memory file structure
+        // Very slow, do not call routinely. JC
+        void audit();
+        // Check for uninitialized blocks.  Slow, do not call in release. JC
+        void checkMem();
+        // for debugging, prints a map of the vfs
+        void dumpMap();
+        void dumpLockCounts();
+        void dumpStatistics();
+        void dumpFiles();
+
+protected:
+        void removeFileBlock(LLVFSFileBlock *fileblock);
+        
+        void eraseBlockLength(LLVFSBlock *block);
+        void eraseBlock(LLVFSBlock *block);
+        void addFreeBlock(LLVFSBlock *block);
+        //void mergeFreeBlocks();
+        void useFreeSpace(LLVFSBlock *free_block, S32 length);
+        void sync(LLVFSFileBlock *block, BOOL remove = FALSE);
+        void presizeDataFile(const U32 size);
+
+        static FILE *openAndLock(const char *filename, const char *mode, BOOL read_lock);
+        static void unlockAndClose(FILE *fp);
+        
+        // Can initiate LRU-based file removal to make space.
+        // The immune file block will not be removed.
+        LLVFSBlock *findFreeBlock(S32 size, LLVFSFileBlock *immune = NULL);
+
+        // lock/unlock data mutex (mDataMutex)
+        void lockData() { mDataMutex->lock(); }
+        void unlockData() { mDataMutex->unlock(); }     
+        
+protected:
+        LLMutex* mDataMutex;
+        
+        typedef std::map<LLVFSFileSpecifier, LLVFSFileBlock*> fileblock_map;
+        fileblock_map mFileBlocks;
+
+        typedef std::multimap<S32, LLVFSBlock*> blocks_length_map_t;
+        blocks_length_map_t     mFreeBlocksByLength;
+        typedef std::multimap<U32, LLVFSBlock*> blocks_location_map_t;
+        blocks_location_map_t   mFreeBlocksByLocation;
+
+        FILE *mDataFP;
+        FILE *mIndexFP;
+
+        std::deque<S32> mIndexHoles;
+
+        char *mIndexFilename;
+        char *mDataFilename;
+        BOOL mReadOnly;
+
+        EVFSValid mValid;
+
+        S32 mLockCounts[VFSLOCK_COUNT];
+        BOOL mRemoveAfterCrash;
+};
+
+extern LLVFS *gVFS;
+
+#endif