src/fsmblockmap.h
author rubidium
Sun, 05 Aug 2007 00:39:42 +0000
branchNewGRF_ports
changeset 6751 08176dfe64b7
parent 6739 3f2ca4d0abda
child 6758 1545d187ab64
permissions -rw-r--r--
(svn r10790) [NewGRF_ports] -Codechange: constify the fsmblockmaps where possible.
[NewGRF_ports] -Fix: a memleak.
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/* $Id$ */
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/** @file FSMblockmap.h Definition of FSMblockmap class for use in state machines*/
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#ifndef FSMBLOCKMAP_H
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#define FSMBLOCKMAP_H
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#include "stdafx.h"
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uint64 inline GetBlockAsBits(byte blocknumber)
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{
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	if (blocknumber == 0) return 0ULL;
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	if (blocknumber > 63) blocknumber -= 64;
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	uint64 result = 1ULL << blocknumber;
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	return result;
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}
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/**
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 * This class provides functions and internal storage for blockmaps used in Finite State Machine
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 *
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*/
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struct FSMblockmap {
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	public:
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		void inline ResetAll()
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		{
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			block_lower = 0x0000000000000000;
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			block_upper = 0x0000000000000000;
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		};
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		void Initialise(const byte *blocklist, int num_bytes)
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		{
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			ResetAll();
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			for (int i = 0; i < num_bytes; i++)
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			{
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				if (blocklist[i] < 64) {
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					block_lower |= GetBlockAsBits(blocklist[i]);
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				} else {
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					block_upper |= GetBlockAsBits(blocklist[i]);
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				}
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			}
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		}
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		uint64 inline GetLower() const
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		{
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			return block_lower;
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		}
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		uint64 inline GetUpper() const
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		{
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			return block_upper;
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		}
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		void inline ReserveBlocks(const FSMblockmap *blockmap)
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		{
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			/* OR with blockmap to reserve blocks */
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			block_lower |= blockmap->GetLower();
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			block_upper |= blockmap->GetUpper();
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		}
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		void inline ReleaseBlocks(const FSMblockmap *blockmap)
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		{
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			/* AND with ones-complement to clear set bits in blockmap from block_lower and block_upper */
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			block_lower &= ~blockmap->GetLower();
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			block_upper &= ~blockmap->GetUpper();
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		}
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		bool inline BlocksAreFree(const FSMblockmap *blockmap) const
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		{
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			uint64 test_lower = blockmap->GetLower();
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			uint64 test_upper = blockmap->GetUpper();
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			if ((~block_lower & test_lower) != test_lower)  return false;
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			if ((~block_upper & test_upper) != test_upper)  return false;
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			return true;
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		}
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		bool inline HasBlocks(const FSMblockmap *blockmap) const
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		{
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			uint64 test_lower = blockmap->GetLower();
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			uint64 test_upper = blockmap->GetUpper();
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			if ((block_lower & test_lower) != test_lower)  return false;
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			if ((block_upper & test_upper) != test_upper)  return false;
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			return true;
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		}
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		bool inline HasBlock(byte blocknumber) const
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		{
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			FSMblockmap test_blockmap;
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			test_blockmap.Initialise(&blocknumber, 1);
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			return HasBlocks(&test_blockmap);
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		}
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		//bool inline HasBlock(byte blocknumber)
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		//{
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		//	uint64 test_block = GetBlockAsBits(blocknumber);
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		//	if (blocknumber < 64) return ((block_lower & test_block) == test_block);
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		//	return ((block_upper & test_block) == test_block);
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		//}
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		bool inline IsNotZero(void) const
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		{
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			return ((block_lower != 0) || (block_upper != 0));
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		}
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		void PrintBlock(bool newline = true) const;
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	private:
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		uint64 block_lower;
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		uint64 block_upper;
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};
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FSMblockmap* SetFSMSingleBlock(const byte *blocklist);
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#endif /* FSMBLOCKMAP_H */