1 /* GemRB - Infinity Engine Emulator 2 * Copyright (C) 2003 |Avenger| 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 2 7 * of the License, or (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. 17 * 18 * 19 */ 20 21 #ifndef CACHE_H 22 #define CACHE_H 23 24 #include "globals.h" 25 26 namespace GemRB { 27 28 #define KEYSIZE 8 29 30 #ifndef ReleaseFun 31 typedef void (*ReleaseFun)(void *); 32 #endif 33 34 class Cache 35 { 36 protected: 37 // Association 38 struct MyAssoc { 39 MyAssoc* pNext; 40 MyAssoc** pPrev; 41 char key[KEYSIZE]; //not ieResRef! 42 ieDword nRefCount; 43 void* data; 44 }; 45 struct MemBlock { 46 MemBlock* pNext; 47 }; 48 49 public: 50 // Construction 51 Cache(int nBlockSize = 10, int nHashTableSize = 129); 52 53 // Attributes 54 // number of elements GetCount()55 inline int GetCount() const 56 { 57 return m_nCount; 58 } IsEmpty()59 inline bool IsEmpty() const 60 { 61 return m_nCount==0; 62 } 63 // Lookup 64 void *GetResource(const ieResRef key) const; 65 // Operations 66 bool SetAt(const ieResRef key, void *rValue); 67 // decreases refcount or drops data 68 //if name is supplied it is faster, it will use rValue to validate the request 69 int DecRef(void *rValue, const ieResRef name, bool free); 70 int RefCount(const ieResRef key) const; 71 void RemoveAll(ReleaseFun fun);//removes all refcounts 72 void Cleanup(); //removes only zero refcounts 73 void InitHashTable(unsigned int hashSize, bool bAllocNow = true); 74 75 // Implementation 76 protected: 77 MyAssoc** m_pHashTable; 78 unsigned int m_nHashTableSize; 79 int m_nCount; 80 MyAssoc* m_pFreeList; 81 MemBlock* m_pBlocks; 82 int m_nBlockSize; 83 84 Cache::MyAssoc* NewAssoc(); 85 void FreeAssoc(Cache::MyAssoc*); 86 Cache::MyAssoc* GetAssocAt(const ieResRef) const; 87 Cache::MyAssoc *GetNextAssoc(Cache::MyAssoc * rNextPosition) const; 88 unsigned int MyHashKey(const ieResRef) const; 89 90 public: 91 ~Cache(); 92 }; 93 94 } 95 96 #endif //CACHE_H 97