1 // Common/DynamicBuffer.h 2 3 #ifndef __COMMON_DYNAMIC_BUFFER_H 4 #define __COMMON_DYNAMIC_BUFFER_H 5 6 template <class T> class CDynamicBuffer 7 { 8 T *_items; 9 size_t _size; 10 size_t _pos; 11 12 CDynamicBuffer(const CDynamicBuffer &buffer); 13 void operator=(const CDynamicBuffer &buffer); 14 15 void Grow(size_t size) 16 { 17 size_t delta = _size >= 64 ? _size : 64; 18 if (delta < size) 19 delta = size; 20 size_t newCap = _size + delta; 21 if (newCap < delta) 22 { 23 newCap = _size + size; 24 if (newCap < size) 25 throw 20120116; 26 } 27 28 T *newBuffer = new T[newCap]; 29 memcpy(newBuffer, _items, _pos * sizeof(T)); 30 delete []_items; 31 _items = newBuffer; 32 _size = newCap; 33 } 34 35 public: 36 CDynamicBuffer(): _items(0), _size(0), _pos(0) {} 37 // operator T *() { return _items; }; 38 operator const T *() const { return _items; }; 39 ~CDynamicBuffer() { delete []_items; } 40 41 T *GetCurPtrAndGrow(size_t addSize) 42 { 43 size_t rem = _size - _pos; 44 if (rem < addSize) 45 Grow(addSize - rem); 46 T *res = _items + _pos; 47 _pos += addSize; 48 return res; 49 } 50 51 const size_t GetPos() const { return _pos; } 52 53 // void Empty() { _pos = 0; } 54 }; 55 56 typedef CDynamicBuffer<unsigned char> CByteDynamicBuffer; 57 58 #endif 59
