vcs.maemo.org Git - physicsfs/blob - lzma/CPP/Common/DynamicBuffer.h

   1 // Common/DynamicBuffer.h
   2
   3 #ifndef __COMMON_DYNAMICBUFFER_H
   4 #define __COMMON_DYNAMICBUFFER_H
   5
   6 #include "Buffer.h"
   7
   8 template <class T> class CDynamicBuffer: public CBuffer<T>
   9 {
  10   void GrowLength(size_t size)
  11   {
  12     size_t delta;
  13     if (this->_capacity > 64)
  14       delta = this->_capacity / 4;
  15     else if (this->_capacity > 8)
  16       delta = 16;
  17     else
  18       delta = 4;
  19     delta = MyMax(delta, size);
  20     SetCapacity(this->_capacity + delta);
  21   }
  22 public:
  23   CDynamicBuffer(): CBuffer<T>() {};
  24   CDynamicBuffer(const CDynamicBuffer &buffer): CBuffer<T>(buffer) {};
  25   CDynamicBuffer(size_t size): CBuffer<T>(size) {};
  26   CDynamicBuffer& operator=(const CDynamicBuffer &buffer)
  27   {
  28     this->Free();
  29     if(buffer._capacity > 0)
  30     {
  31       SetCapacity(buffer._capacity);
  32       memmove(this->_items, buffer._items, buffer._capacity * sizeof(T));
  33     }
  34     return *this;
  35   }
  36   void EnsureCapacity(size_t capacity)
  37   {
  38     if (this->_capacity < capacity)
  39       GrowLength(capacity - this->_capacity);
  40   }
  41 };
  42
  43 typedef CDynamicBuffer<char> CCharDynamicBuffer;
  44 typedef CDynamicBuffer<wchar_t> CWCharDynamicBuffer;
  45 typedef CDynamicBuffer<unsigned char> CByteDynamicBuffer;
  46
  47 #endif