73 lines
1.3 KiB
C++
73 lines
1.3 KiB
C++
#ifndef PAGEDBUFFER_H
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#define PAGEDBUFFER_H
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#include "System.h"
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#include <vector>
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#include <stdint.h>
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#include <stdlib.h>
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template <typename T>
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class PagedBuffer
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{
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public:
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/**
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* Create a PagedBuffer.
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*/
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PagedBuffer<T>()
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{
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m_n_per_page = System::page_size / sizeof(T);
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m_size = 0u;
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}
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~PagedBuffer<T>()
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{
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for (auto it : m_pages)
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{
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System::free_pages(it, 1);
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}
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}
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const T & operator[](unsigned int index) const
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{
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while (index >= (m_pages.size() * m_n_per_page))
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{
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grow();
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}
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return m_pages[page_index(index)][index_in_page(index)];
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}
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T & operator[](unsigned int index)
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{
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while (index >= (m_pages.size() * m_n_per_page))
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{
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grow();
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}
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return m_pages[page_index(index)][index_in_page(index)];
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}
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size_t size() { return m_size; }
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protected:
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unsigned int page_index(unsigned int index)
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{
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return index / m_n_per_page;
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}
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unsigned int index_in_page(unsigned int index)
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{
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return index % m_n_per_page;
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}
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void grow()
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{
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m_pages.push_back((T *)System::alloc_pages(1));
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m_size += m_n_per_page;
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}
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std::vector<T *> m_pages;
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unsigned long m_size;
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unsigned int m_n_per_page;
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};
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#endif
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