731 lines
16 KiB
C++
731 lines
16 KiB
C++
/*
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* This file is a part of PikoTools
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* and is distributed under the (new) BSD licence.
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* Author: Tomasz Sowa <t.sowa@ttmath.org>
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*/
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/*
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* Copyright (c) 2012, Tomasz Sowa
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* * Neither the name Tomasz Sowa nor the names of contributors to this
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* project may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef headerfile_picotools_membuffer_membuffer
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#define headerfile_picotools_membuffer_membuffer
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namespace PT
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{
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/*
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*/
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template<class ItemType, size_t stack_size, size_t heap_block_size>
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class MemBuffer
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{
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public:
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class Iterator
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{
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public:
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bool operator==(const Iterator & i);
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bool operator!=(const Iterator & i);
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Iterator & operator++(); // prefix ++
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Iterator operator++(int); // postfix ++
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Iterator & operator--(); // prefix --
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Iterator operator--(int); // postfix --
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ItemType & operator*();
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private:
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MemBuffer * mem_buffer;
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size_t dynamic_array_index;
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size_t index;
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friend class MemBuffer;
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};
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class ConstIterator
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{
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public:
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bool operator==(const ConstIterator & i);
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bool operator!=(const ConstIterator & i);
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ConstIterator & operator++(); // prefix ++
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ConstIterator operator++(int); // postfix ++
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ConstIterator & operator--(); // prefix --
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ConstIterator operator--(int); // postfix --
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ItemType operator*();
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private:
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const MemBuffer * mem_buffer;
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size_t dynamic_array_index;
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size_t index;
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friend class MemBuffer;
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};
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MemBuffer();
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~MemBuffer();
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MemBuffer(const MemBuffer<ItemType, stack_size, heap_block_size> & arg);
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MemBuffer & operator=(const MemBuffer<ItemType, stack_size, heap_block_size> & arg);
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void Append(ItemType item);
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void Append(ItemType * item_array, size_t len);
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size_t Size() const;
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bool Empty() const;
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void Reserve(size_t len);
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size_t Capacity() const;
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void Clear(); // frees memory but only to Capacity()
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Iterator Begin();
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Iterator End();
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ConstIterator Begin() const;
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ConstIterator End() const;
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ItemType & operator[](size_t i);
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const ItemType operator[](size_t i) const;
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private:
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struct MemArray
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{
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size_t size_used;
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ItemType * buf;
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};
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ItemType stack_array[stack_size];
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MemArray * dynamic_array; // dynamic array of MemArray descriptors
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size_t dynamic_array_index; // index of a MemArray to which the last insertion was made
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// size_t(-1) means the stack_array
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size_t dynamic_array_used; // how many MemArray-s have been inited in dynamic_array
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size_t dynamic_array_size; // the size of the dynamic_array
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size_t size_used; // the size of all valid items
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size_t size_allocated; // how many memory is reserved
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size_t size_reserved; // memory reserved by Reserve(), it is used by Clear()
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void AddDynamicNode();
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};
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/*
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Iterator
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*/
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template<class ItemType, size_t stack_size, size_t heap_block_size>
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typename MemBuffer<ItemType, stack_size, heap_block_size>::Iterator &
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MemBuffer<ItemType, stack_size, heap_block_size>::Iterator::operator++()
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{
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if( dynamic_array_index == size_t(-1) )
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{
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index += 1;
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if( index >= stack_size )
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{
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index = 0;
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dynamic_array_index = 0;
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}
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}
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else
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{
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index += 1;
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if( index >= heap_block_size )
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{
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dynamic_array_index += 1;
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index = 0;
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}
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}
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return *this;
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}
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template<class ItemType, size_t stack_size, size_t heap_block_size>
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typename MemBuffer<ItemType, stack_size, heap_block_size>::Iterator
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MemBuffer<ItemType, stack_size, heap_block_size>::Iterator::operator++(int)
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{
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Iterator old(*this);
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operator++();
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return old;
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}
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template<class ItemType, size_t stack_size, size_t heap_block_size>
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typename MemBuffer<ItemType, stack_size, heap_block_size>::Iterator &
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MemBuffer<ItemType, stack_size, heap_block_size>::Iterator::operator--()
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{
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if( index == 0 )
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{
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dynamic_array_index -= 1;
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if( dynamic_array_index == size_t(-1) )
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index = stack_size - 1;
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else
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index = heap_block_size - 1;
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}
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else
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{
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index -= 1;
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}
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return *this;
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}
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template<class ItemType, size_t stack_size, size_t heap_block_size>
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typename MemBuffer<ItemType, stack_size, heap_block_size>::Iterator
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MemBuffer<ItemType, stack_size, heap_block_size>::Iterator::operator--(int)
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{
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Iterator old(*this);
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operator++();
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return old;
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}
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template<class ItemType, size_t stack_size, size_t heap_block_size>
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ItemType & MemBuffer<ItemType, stack_size, heap_block_size>::Iterator::operator*()
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{
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if( dynamic_array_index == size_t(-1) )
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{
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return mem_buffer->stack_array[index];
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}
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else
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{
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return mem_buffer->dynamic_array[dynamic_array_index].buf[index];
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}
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}
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template<class ItemType, size_t stack_size, size_t heap_block_size>
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bool MemBuffer<ItemType, stack_size, heap_block_size>::Iterator::operator==(const Iterator & i)
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{
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return mem_buffer == i.mem_buffer &&
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dynamic_array_index == i.dynamic_array_index &&
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index == i.index;
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}
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template<class ItemType, size_t stack_size, size_t heap_block_size>
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bool MemBuffer<ItemType, stack_size, heap_block_size>::Iterator::operator!=(const Iterator & i)
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{
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return mem_buffer != i.mem_buffer ||
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dynamic_array_index != i.dynamic_array_index ||
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index != i.index;
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}
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/*
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ConstIterator
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*/
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template<class ItemType, size_t stack_size, size_t heap_block_size>
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typename MemBuffer<ItemType, stack_size, heap_block_size>::ConstIterator &
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MemBuffer<ItemType, stack_size, heap_block_size>::ConstIterator::operator++()
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{
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if( dynamic_array_index == size_t(-1) )
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{
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index += 1;
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if( index >= stack_size )
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{
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index = 0;
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dynamic_array_index = 0;
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}
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}
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else
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{
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index += 1;
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if( index >= heap_block_size )
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{
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dynamic_array_index += 1;
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index = 0;
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}
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}
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return *this;
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}
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template<class ItemType, size_t stack_size, size_t heap_block_size>
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typename MemBuffer<ItemType, stack_size, heap_block_size>::ConstIterator
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MemBuffer<ItemType, stack_size, heap_block_size>::ConstIterator::operator++(int)
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{
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ConstIterator old(*this);
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operator++();
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return old;
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}
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template<class ItemType, size_t stack_size, size_t heap_block_size>
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typename MemBuffer<ItemType, stack_size, heap_block_size>::ConstIterator &
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MemBuffer<ItemType, stack_size, heap_block_size>::ConstIterator::operator--()
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{
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if( index == 0 )
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{
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dynamic_array_index -= 1;
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if( dynamic_array_index == size_t(-1) )
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index = stack_size - 1;
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else
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index = heap_block_size - 1;
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}
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else
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{
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index -= 1;
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}
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return *this;
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}
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template<class ItemType, size_t stack_size, size_t heap_block_size>
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typename MemBuffer<ItemType, stack_size, heap_block_size>::ConstIterator
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MemBuffer<ItemType, stack_size, heap_block_size>::ConstIterator::operator--(int)
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{
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ConstIterator old(*this);
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operator++();
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return old;
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}
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template<class ItemType, size_t stack_size, size_t heap_block_size>
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ItemType MemBuffer<ItemType, stack_size, heap_block_size>::ConstIterator::operator*()
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{
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if( dynamic_array_index == size_t(-1) )
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{
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return mem_buffer->stack_array[index];
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}
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else
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{
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return mem_buffer->dynamic_array[dynamic_array_index].buf[index];
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}
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}
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template<class ItemType, size_t stack_size, size_t heap_block_size>
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bool MemBuffer<ItemType, stack_size, heap_block_size>::ConstIterator::operator==(const ConstIterator & i)
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{
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return mem_buffer == i.mem_buffer &&
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dynamic_array_index == i.dynamic_array_index &&
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index == i.index;
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}
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template<class ItemType, size_t stack_size, size_t heap_block_size>
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bool MemBuffer<ItemType, stack_size, heap_block_size>::ConstIterator::operator!=(const ConstIterator & i)
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{
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return mem_buffer != i.mem_buffer ||
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dynamic_array_index != i.dynamic_array_index ||
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index != i.index;
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}
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/*
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MemBuffer
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*/
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template<class ItemType, size_t stack_size, size_t heap_block_size>
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MemBuffer<ItemType, stack_size, heap_block_size>::MemBuffer()
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{
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size_reserved = 0;
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size_used = 0;
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size_allocated = stack_size;
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dynamic_array = 0;
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dynamic_array_index = size_t(-1);
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dynamic_array_used = 0;
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dynamic_array_size = 0;
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}
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template<class ItemType, size_t stack_size, size_t heap_block_size>
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MemBuffer<ItemType, stack_size, heap_block_size>::~MemBuffer()
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{
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if( dynamic_array )
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{
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for(size_t i=0 ; i<dynamic_array_used ; ++i)
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delete [] dynamic_array[i].buf;
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delete [] dynamic_array;
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}
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}
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template<class ItemType, size_t stack_size, size_t heap_block_size>
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MemBuffer<ItemType, stack_size, heap_block_size>::MemBuffer(const MemBuffer<ItemType, stack_size, heap_block_size> & arg)
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{
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operator=(arg);
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}
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template<class ItemType, size_t stack_size, size_t heap_block_size>
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MemBuffer<ItemType, stack_size, heap_block_size> &
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MemBuffer<ItemType, stack_size, heap_block_size>::operator=(const MemBuffer<ItemType, stack_size, heap_block_size> & arg)
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{
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if( size_used > 0 )
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Clear();
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ConstIterator i = arg.Begin();
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for( ; i != arg.End() ; ++i)
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Append(*i);
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return *this;
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}
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template<class ItemType, size_t stack_size, size_t heap_block_size>
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void MemBuffer<ItemType, stack_size, heap_block_size>::AddDynamicNode()
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{
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if( dynamic_array_used >= dynamic_array_size )
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{
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// reallocating
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dynamic_array_size += 2; // 64;
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MemArray * new_array = new MemArray[dynamic_array_size];
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for(size_t i=0 ; i<dynamic_array_used ; ++i)
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new_array[i] = dynamic_array[i];
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delete [] dynamic_array;
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dynamic_array = new_array;
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}
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dynamic_array[dynamic_array_used].size_used = 0;
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dynamic_array[dynamic_array_used].buf = new ItemType[heap_block_size];
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dynamic_array_used += 1;
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size_allocated += heap_block_size;
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}
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template<class ItemType, size_t stack_size, size_t heap_block_size>
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void MemBuffer<ItemType, stack_size, heap_block_size>::Append(ItemType item)
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{
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if( size_used < stack_size )
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{
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stack_array[size_used] = item;
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}
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else
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{
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if( dynamic_array_index == size_t(-1) )
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{
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dynamic_array_index = 0;
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if( dynamic_array_index >= dynamic_array_used )
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AddDynamicNode();
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dynamic_array[dynamic_array_index].size_used = 0;
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}
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else
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if( dynamic_array[dynamic_array_index].size_used >= heap_block_size )
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{
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dynamic_array_index += 1;
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if( dynamic_array_index >= dynamic_array_used )
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AddDynamicNode();
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dynamic_array[dynamic_array_index].size_used = 0;
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}
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dynamic_array[dynamic_array_index].buf[dynamic_array[dynamic_array_index].size_used] = item;
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dynamic_array[dynamic_array_index].size_used += 1;
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}
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size_used += 1;
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}
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template<class ItemType, size_t stack_size, size_t heap_block_size>
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void MemBuffer<ItemType, stack_size, heap_block_size>::Append(ItemType * item_array, size_t len)
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{
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if( size_used + len <= stack_size )
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{
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for(size_t i=0 ; i<len ; ++i)
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stack_array[size_used++] = item_array[i];
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return;
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}
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if( dynamic_array_index != size_t(-1) &&
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dynamic_array[dynamic_array_index].size_used + len <= heap_block_size )
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{
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ItemType * buf = dynamic_array[dynamic_array_index].buf;
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size_t bufsize = dynamic_array[dynamic_array_index].size_used;
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for(size_t i=0 ; i<len ; ++i)
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buf[bufsize++] = item_array[i];
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dynamic_array[dynamic_array_index].size_used += len;
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size_used += len;
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return;
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}
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for(size_t i=0 ; i<len ; ++i)
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Append(item_array[i]);
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}
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template<class ItemType, size_t stack_size, size_t heap_block_size>
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ItemType & MemBuffer<ItemType, stack_size, heap_block_size>::operator[](size_t i)
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{
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if( i < stack_size )
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{
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return stack_array[i];
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}
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else
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{
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i -= stack_size;
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size_t index = i / heap_block_size;
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size_t offset = i % heap_block_size;
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return dynamic_array[index].buf[offset];
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}
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}
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template<class ItemType, size_t stack_size, size_t heap_block_size>
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const ItemType MemBuffer<ItemType, stack_size, heap_block_size>::operator[](size_t i) const
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{
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if( i < stack_size )
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{
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return stack_array[i];
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}
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else
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{
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i -= stack_size;
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size_t index = i / heap_block_size;
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size_t offset = i % heap_block_size;
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return dynamic_array[index].buf[offset];
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}
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}
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template<class ItemType, size_t stack_size, size_t heap_block_size>
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size_t MemBuffer<ItemType, stack_size, heap_block_size>::Size() const
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{
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return size_used;
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}
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template<class ItemType, size_t stack_size, size_t heap_block_size>
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bool MemBuffer<ItemType, stack_size, heap_block_size>::Empty() const
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{
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return size_used == 0;
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}
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template<class ItemType, size_t stack_size, size_t heap_block_size>
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typename MemBuffer<ItemType, stack_size, heap_block_size>::Iterator
|
|
MemBuffer<ItemType, stack_size, heap_block_size>::Begin()
|
|
{
|
|
Iterator i;
|
|
|
|
i.mem_buffer = this;
|
|
i.dynamic_array_index = size_t(-1);
|
|
i.index = 0;
|
|
|
|
return i;
|
|
}
|
|
|
|
|
|
template<class ItemType, size_t stack_size, size_t heap_block_size>
|
|
typename MemBuffer<ItemType, stack_size, heap_block_size>::Iterator
|
|
MemBuffer<ItemType, stack_size, heap_block_size>::End()
|
|
{
|
|
Iterator i;
|
|
|
|
i.mem_buffer = this;
|
|
|
|
if( size_used <= stack_size )
|
|
{
|
|
i.dynamic_array_index = size_t(-1);
|
|
i.index = size_used;
|
|
|
|
if( i.index >= stack_size )
|
|
{
|
|
i.dynamic_array_index = 0;
|
|
i.index = 0;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
i.dynamic_array_index = dynamic_array_index;
|
|
i.index = dynamic_array[dynamic_array_index].size_used;
|
|
|
|
if( i.index >= heap_block_size )
|
|
{
|
|
i.dynamic_array_index += 1;
|
|
i.index = 0;
|
|
}
|
|
}
|
|
|
|
return i;
|
|
}
|
|
|
|
|
|
|
|
template<class ItemType, size_t stack_size, size_t heap_block_size>
|
|
typename MemBuffer<ItemType, stack_size, heap_block_size>::ConstIterator
|
|
MemBuffer<ItemType, stack_size, heap_block_size>::Begin() const
|
|
{
|
|
ConstIterator i;
|
|
|
|
i.mem_buffer = this;
|
|
i.dynamic_array_index = size_t(-1);
|
|
i.index = 0;
|
|
|
|
return i;
|
|
}
|
|
|
|
|
|
template<class ItemType, size_t stack_size, size_t heap_block_size>
|
|
typename MemBuffer<ItemType, stack_size, heap_block_size>::ConstIterator
|
|
MemBuffer<ItemType, stack_size, heap_block_size>::End() const
|
|
{
|
|
ConstIterator i;
|
|
|
|
i.mem_buffer = this;
|
|
|
|
if( size_used <= stack_size )
|
|
{
|
|
i.dynamic_array_index = size_t(-1);
|
|
i.index = size_used;
|
|
|
|
if( i.index >= stack_size )
|
|
{
|
|
i.dynamic_array_index = 0;
|
|
i.index = 0;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
i.dynamic_array_index = dynamic_array_index;
|
|
i.index = dynamic_array[dynamic_array_index].size_used;
|
|
|
|
if( i.index >= heap_block_size )
|
|
{
|
|
i.dynamic_array_index += 1;
|
|
i.index = 0;
|
|
}
|
|
}
|
|
|
|
return i;
|
|
}
|
|
|
|
|
|
|
|
template<class ItemType, size_t stack_size, size_t heap_block_size>
|
|
void MemBuffer<ItemType, stack_size, heap_block_size>::Reserve(size_t len)
|
|
{
|
|
size_reserved = len;
|
|
|
|
while( size_allocated < size_reserved )
|
|
AddDynamicNode();
|
|
}
|
|
|
|
|
|
template<class ItemType, size_t stack_size, size_t heap_block_size>
|
|
size_t MemBuffer<ItemType, stack_size, heap_block_size>::Capacity() const
|
|
{
|
|
return size_allocated;
|
|
}
|
|
|
|
|
|
template<class ItemType, size_t stack_size, size_t heap_block_size>
|
|
void MemBuffer<ItemType, stack_size, heap_block_size>::Clear()
|
|
{
|
|
size_t index = 0;
|
|
|
|
if( size_reserved > stack_size )
|
|
{
|
|
index = (size_reserved - stack_size) / heap_block_size + 1;
|
|
size_t old_index = index;
|
|
|
|
for(; index < dynamic_array_used ; ++index)
|
|
{
|
|
size_allocated -= heap_block_size;
|
|
delete [] dynamic_array[index].buf;
|
|
}
|
|
|
|
dynamic_array_used = old_index;
|
|
}
|
|
|
|
size_used = 0;
|
|
dynamic_array_index = size_t(-1);
|
|
}
|
|
|
|
|
|
} // namespace
|
|
|
|
|
|
#endif
|
|
|