mem_store.rar_mem-store_memory

//--------------------------------------------------------------------------- #include <vcl.h> #pragma hdrstop #include <fstream> #include "mem_store.h" //--------------------------------------------------------------------------- #pragma package(smart_init) CMemStore::CMemStore(): buff(NULL), currPtr(NULL), currSize(0), currFreeLimit(0), bIsMemOwner(true) //螂囀蜘 憐詭� 擋縉褒�詼靦�� 鋒��靦� 頡 篛蝦憤 檀憐隧粵斡 {}; CMemStore::CMemStore(void *ptr, unsigned int size): //慚摟廓鞅頑甕� 螂閤羲齷 鋒��錚 溫� 餾粵�� 滓瘩贖 愿 獗� buff(reinterpret_cast<unsigned char*>(ptr)), currPtr(buff), currSize(size), currFreeLimit(size), bIsMemOwner(false) //螂囀蜘� 獗鼻�� 擋縉褒�詼靦�� 鋒��靦� - 擋菔錶粳 � 擇詬慮 餾粵�� { } //------------------------------ CMemStore::~CMemStore() { if(bIsMemOwner && (buff != NULL)) delete[] buff; }; //-------頑震艘 慚縴整皖態 � 螂囀蜘------------ int CMemStore::write(void *ptr, unsigned int _size) { if(bIsMemOwner && buff == NULL) //羨� 璃雛廈 獗 頑震興鈇鞅 - 順滇��粳 鋒��靦 { currSize = 1024; buff = new unsigned char[currSize]; //頡-擭蝓闐璃� 1蒞 currPtr = buff; currFreeLimit = currSize; } if(currFreeLimit < _size) //����錚 獗避痞琯� { if(!bIsMemOwner) return 1; unsigned int newSize = currSize; //瘟順� 擋髡綑 unsigned int fillPart = currSize - currFreeLimit; //羲蝓讒� 篦碟痘 頑��錙 unsigned int newFreeLim = currFreeLimit; //羲蝓讒� 蛭滇� 篛螂蝠瘟 頡縛� 閱擇痘頜窟粱粵�� do { newSize *=2; //戴粱摺弊琯� 鋒��靦 � 2 擋頑 newFreeLim = newSize - fillPart; //瘟順� 螂囀� 篛螂蝠瘟廈 慮羲� }while(newFreeLim < _size); unsigned char *newBuff = new unsigned char [newSize]; //瘟順� 蛭罄綑 CopyMemory(newBuff, buff, fillPart); //閱擇瘟� 滓瘩贖 � 瘟順� 蛭繆� delete[] buff; //羲痙癮 蛭繆� 褓隆菔誅琯� buff = newBuff; //閱擇熱羲擋弊琯� 閱擇慮瘩灘 -> 熱闐餃 順滇雒瘩蝗 鋒��錚 currPtr = buff + fillPart; //閱擇熱羲擋弊琯� 閱擇慮瘩灘 -> 熱闐餃 鋒��錚 蝕滓 皚豢� 頑震興鈇靦 滓瘩灘 currSize = newSize; //閱擇熱羲擋弊琯� 閱擇慮瘩灘 -> 螂孃� 擋髡綑 順滇雒瘩蝗 鋒��錚 currFreeLimit = currSize - fillPart; //閱擇熱羲擋弊琯� 閱擇慮瘩灘 -> 蜻鞅雛羲隆 篛螂蝠瘟� 鋒��錚 } CopyMemory(currPtr, ptr, _size); //閱擇瘟� 滓瘩贖 currPtr += _size; //閱擇熱羲擋弊琯� 閱擇慮瘩灘 -> 熱闐餃 鋒��錚 蝕滓 皚豢� 頑震興鈇靦 滓瘩灘 currFreeLimit -= _size; //閱擇熱羲擋弊琯� 閱擇慮瘩灘 -> 蜻鞅雛羲隆 篛螂蝠瘟� 鋒��錚 return 0; }; //------------------餾粵徹 滓瘩贖 愿 螂囀蜘�-------------------------------- int CMemStore::read(void *ptr, unsigned int _size) { CopyMemory(ptr, currPtr, _size); //閱擇瘟� 滓瘩贖 if(currFreeLimit >= _size) //頡蒙 羨� 熱錨溘憬� � 頜窟粱發 順滇雒瘩蝗 鋒��錚 { currPtr += _size; //閱擇熱羲擋弊琯� 閱擇慮瘩灘 -> 熱闐餃 鋒��錚 褕蝕滓 憐豢� 鞣錶靦(頑震興鈇靦) currFreeLimit -= _size; //閱擇熱羲擋弊琯� 閱擇慮瘩灘 -> 蜻鞅雛羲隆 篛螂蝠瘟� 鋒��錚 return 0; }else //餾粵徹 頜蝙麂藝� 頑 頜窟粱番� 順滇雒瘟� 鋒��錚 { currPtr = buff + currSize; //閱擇熱羲擋弊琯� 閱擇慮瘩灘 -> 擱琦痞粱� 溫� 鋼蝕孃� 複綑皖慷 � 蜻獗� 鋒��錚 currFreeLimit = 0; //閱擇熱羲擋弊琯� 閱擇慮瘩灘 -> 篛螂蝠瘟� 鋒��錚 怔� return 1; } }; //-----------檀錶瘟階� 頡飾甕� 溫� 餾粵��/頑震縊----------------------- int CMemStore::setPosition(unsigned int position) { if(position < currSize) { currPtr = buff + position; //閱擇熱羲擋弊琯� 閱擇慮瘩灘 -> 熱闐餃 鋒��錚 褕蝕滓 憐豢� 鞣錶靦(頑震興鈇靦) currFreeLimit = currSize - position; //閱擇熱羲擋弊琯� 閱擇慮瘩灘 -> 篛螂蝠瘟� 鋒��錚 怔� return 0; }else { currPtr = buff + currSize; //閱擇熱羲擋弊琯� 閱擇慮瘩灘 -> 擱琦痞粱� 溫� 鋼蝕孃� 複綑皖慷 � 蜻獗� 鋒��錚 currFreeLimit = 0; //閱擇熱羲擋弊琯� 閱擇慮瘩灘 -> 篛螂蝠瘟� 鋒��錚 怔� return 1; } };