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