misc/libphysfs/lzma/CPP/Common/DynamicBuffer.h
author Wuzzy <almikes@aol.com>
Sat, 15 Apr 2017 23:21:13 +0200
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// Common/DynamicBuffer.h
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#ifndef __COMMON_DYNAMICBUFFER_H
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#define __COMMON_DYNAMICBUFFER_H
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#include "Buffer.h"
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template <class T> class CDynamicBuffer: public CBuffer<T>
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{    
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  void GrowLength(size_t size)
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  {
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    size_t delta;
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    if (this->_capacity > 64)
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      delta = this->_capacity / 4;
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    else if (this->_capacity > 8)
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      delta = 16;
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    else
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      delta = 4;
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    delta = MyMax(delta, size);
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    SetCapacity(this->_capacity + delta);
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  }
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public:
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  CDynamicBuffer(): CBuffer<T>() {};
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  CDynamicBuffer(const CDynamicBuffer &buffer): CBuffer<T>(buffer) {};
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  CDynamicBuffer(size_t size): CBuffer<T>(size) {};
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  CDynamicBuffer& operator=(const CDynamicBuffer &buffer)
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  {
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    this->Free();
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    if(buffer._capacity > 0)
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    {
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      SetCapacity(buffer._capacity);
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      memmove(this->_items, buffer._items, buffer._capacity * sizeof(T));
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    }
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    return *this;
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  }
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  void EnsureCapacity(size_t capacity)
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  {
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    if (this->_capacity < capacity)
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      GrowLength(capacity - this->_capacity);
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  }
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};
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typedef CDynamicBuffer<char> CCharDynamicBuffer;
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typedef CDynamicBuffer<wchar_t> CWCharDynamicBuffer;
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typedef CDynamicBuffer<unsigned char> CByteDynamicBuffer;
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#endif