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			94 lines
		
	
	
	
		
			2.2 KiB
		
	
	
	
		
			D
		
	
	
	
	
	
			
		
		
	
	
			94 lines
		
	
	
	
		
			2.2 KiB
		
	
	
	
		
			D
		
	
	
	
	
	
/*
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  OpenMW - The completely unofficial reimplementation of Morrowind
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  Copyright (C) 2008-2009  Nicolay Korslund
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  Email: < korslund@gmail.com >
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  WWW: http://openmw.sourceforge.net/
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  This file (outbuffer.d) is part of the OpenMW package.
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  OpenMW is distributed as free software: you can redistribute it
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  and/or modify it under the terms of the GNU General Public License
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  version 3, as published by the Free Software Foundation.
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  This program is distributed in the hope that it will be useful, but
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  WITHOUT ANY WARRANTY; without even the implied warranty of
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  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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  General Public License for more details.
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  You should have received a copy of the GNU General Public License
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  version 3 along with this program. If not, see
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  http://www.gnu.org/licenses/ .
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 */
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/*
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  This files provides a simple buffer class used for writing the cache
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  files. It lets you 'write' data to a growing memory buffer and
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  allows you to change the written data after the fact (since it's
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  retained in memory.) When you're done, you can write the entire
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  buffer to a stream in one operation.
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 */
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module terrain.outbuffer;
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import util.regions;
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import std.stream;
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class OutBuffer
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{
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 private:
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  RegionManager reg;
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  long used;
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  void[][] buffers;
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 public:
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  this()
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    {
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      reg = new RegionManager("Outbuf", 200*1024);
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    }
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  void reset()
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    {
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      if(buffers.length)
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        delete buffers;
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      reg.freeAll();
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      used = 0;
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      buffers = null;
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    }
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  // Write everyting to a stream as one buffer
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  void writeTo(Stream str)
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    {
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      foreach(void[] v; buffers)
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        str.writeExact(v.ptr, v.length);
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      reset();
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    }
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  // Get a pointer to a new block at least 'bytes' large, but don't
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  // add it to the list.
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  void[] reserve(size_t bytes)
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    { return reg.allocate(bytes); }
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  // Get a new block which is 'bytes' size large.
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  void[] add(size_t bytes)
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    {
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      void[] p = reserve(bytes);
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      add(p);
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      return p;
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    }
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  // Add an existing block to the write list
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  void add(void[] p)
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  {
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    buffers ~= p;
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    used += p.length;
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  }
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  T[] write(T)(size_t num)
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  {
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    return cast(T[])add(num * T.sizeof);
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  }
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  size_t size() { return used; }
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}
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