fastarray.cpp

俄罗斯人开发的大名鼎鼎的Pocket Pc 阅读器haaliread的源代码,visual c

/*
 * Copyright (c) 2001,2002,2003 Mike Matsnev.  All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice immediately at the beginning of the file, without modification,
 *    this list of conditions, and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Absolutely no warranty of function or purpose is made by the author
 *    Mike Matsnev.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 * $Id: FastArray.cpp,v 1.4.2.1 2003/04/12 22:52:32 mike Exp $
 * 
 */

#include <afx.h>

#include "FastArray.h"

#define	START_CHUNKS	16
#define	CHUNKS_INC	16

FastArrayImp::FastArrayImp(unsigned item_size,HANDLE heap,bool dofree) :
  m_item_size(item_size), m_heap(heap), m_dofree(dofree)
{
  m_chunks=(char**)HeapAlloc(m_heap,HEAP_NO_SERIALIZE|HEAP_ZERO_MEMORY,
    sizeof(char*)*START_CHUNKS);
  if (!m_chunks)
    AfxThrowMemoryException();
  m_chunks[0]=(char*)HeapAlloc(m_heap,HEAP_NO_SERIALIZE,m_item_size*CHUNK_ITEMS);
  if (!m_chunks[0]) {
    if (m_dofree)
      HeapFree(m_heap,HEAP_NO_SERIALIZE,(void*)m_chunks);
    AfxThrowMemoryException();
  }
  m_nchunks=START_CHUNKS;
  m_curchunk=m_chunkptr=0;
}

FastArrayImp::~FastArrayImp() {
  if (m_dofree) {
    for (unsigned i=0;i<m_nchunks;++i)
      if (m_chunks[i])
	HeapFree(m_heap,HEAP_NO_SERIALIZE,(void*)m_chunks[i]);
    HeapFree(m_heap,HEAP_NO_SERIALIZE,(void*)m_chunks);
  }
}

void	*FastArrayImp::SlowGet() {
  if (++m_curchunk>=m_nchunks) {
    m_nchunks+=CHUNKS_INC;
    m_chunks=(char**)HeapReAlloc(m_heap,HEAP_NO_SERIALIZE|HEAP_ZERO_MEMORY,
      (void*)m_chunks,sizeof(char*)*m_nchunks);
    if (!m_chunks)
      AfxThrowMemoryException();
  }
  if (!m_chunks[m_curchunk]) {
    m_chunks[m_curchunk]=(char*)HeapAlloc(m_heap,HEAP_NO_SERIALIZE,m_item_size*CHUNK_ITEMS);
    if (!m_chunks[m_curchunk])
      AfxThrowMemoryException();
  }
  m_chunkptr=1;
  return (void*)m_chunks[m_curchunk];
}