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comparison src/win32/7zip/7z/CPP/Common/DynamicBuffer.h @ 1:f9f4f1b99eed

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importing src directory
author Robert McIntyre <rlm@mit.edu>
date Sat, 03 Mar 2012 10:31:27 -0600
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0:8ced16adf2e1 1:f9f4f1b99eed
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