Buffer.h revision baa3858d3f5d128a5c8466b700098109edcad5f2 
1// Common/Buffer.h
2
3#ifndef __COMMON_BUFFER_H
4#define __COMMON_BUFFER_H
5
6#include "Defs.h"
7
8template <class T> class CBuffer
9{
10protected:
11  size_t _capacity;
12  T *_items;
13public:
14  void Free()
15  {
16    delete []_items;
17    _items = 0;
18    _capacity = 0;
19  }
20  CBuffer(): _capacity(0), _items(0) {};
21  CBuffer(const CBuffer &buffer): _capacity(0), _items(0) { *this = buffer; }
22  CBuffer(size_t size): _items(0), _capacity(0) {  SetCapacity(size); }
23  virtual ~CBuffer() { delete []_items; }
24  operator T *() { return _items; };
25  operator const T *() const { return _items; };
26  size_t GetCapacity() const { return  _capacity; }
27  void SetCapacity(size_t newCapacity)
28  {
29    if (newCapacity == _capacity)
30      return;
31    T *newBuffer;
32    if (newCapacity > 0)
33    {
34      newBuffer = new T[newCapacity];
35      if (_capacity > 0)
36        memmove(newBuffer, _items, MyMin(_capacity, newCapacity) * sizeof(T));
37    }
38    else
39      newBuffer = 0;
40    delete []_items;
41    _items = newBuffer;
42    _capacity = newCapacity;
43  }
44  CBuffer& operator=(const CBuffer &buffer)
45  {
46    Free();
47    if (buffer._capacity > 0)
48    {
49      SetCapacity(buffer._capacity);
50      memmove(_items, buffer._items, buffer._capacity * sizeof(T));
51    }
52    return *this;
53  }
54};
55
56template <class T>
57bool operator==(const CBuffer<T>& b1, const CBuffer<T>& b2)
58{
59  if (b1.GetCapacity() != b2.GetCapacity())
60    return false;
61  for (size_t i = 0; i < b1.GetCapacity(); i++)
62    if (b1[i] != b2[i])
63      return false;
64  return true;
65}
66
67template <class T>
68bool operator!=(const CBuffer<T>& b1, const CBuffer<T>& b2)
69{
70  return !(b1 == b2);
71}
72
73typedef CBuffer<char> CCharBuffer;
74typedef CBuffer<wchar_t> CWCharBuffer;
75typedef CBuffer<unsigned char> CByteBuffer;
76
77#endif
78