#pragma once
// WAC.com Class Liblary for Visual C++
// Copyright (C) WAC.com Inc. All rights reserved.
//
// This file is a part of the WAC.com Class Liblary.
// The use and distribution terms for this software are covered by the
// Common Public License 1.0 (http://opensource.org/licenses/cpl.php)
// which can be found in the file CPL.TXT at the root of this distribution.
// By using this software in any fashion, you are agreeing to be bound by
// the terms of this license. You must not remove this notice, or
// any other, from this software.
// '04.03.24 : 新規作成 (sha)
// '06.04.14 : CVirtualAllocator::Reallocate() の修正 (sug)
// '07.03.20 : CVirtualAllocator::VirtualFreeのNULLチェック(AppVerifier対応）(imatsu)
// '07.04.06 : コードの整備 (sha)
// '07.05.16 : Reallocateの仕様を、VC8に準拠 (sha)
////////////////////////////////////////////////////////////////////////////////
// CVirtualAllocator
class CVirtualAllocator
{
public:
static void* Allocate(size_t nBytes) throw()
{
return ::VirtualAlloc(NULL, nBytes, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
}
static void* Reallocate(void* p, size_t nBytes) throw()
{
#if (_MSC_VER >= 1400) // VS2005
if (p==NULL){
return ( Allocate(nBytes) );
}
if (nBytes==0){
Free(p);
return NULL;
}
#endif
void* pNew = ::VirtualAlloc(NULL, nBytes, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
if (pNew)
{
size_t nOrgBytes = CVirtualAllocator::GetSize(p);
size_t nCopySize = (nBytes >= nOrgBytes) ? nOrgBytes : nBytes;
::MoveMemory(pNew, p, nCopySize);
}
if (p)
{
::VirtualFree(p, 0, MEM_RELEASE);
}
return pNew;
}
static void Free(void* p) throw()
{
if (p)
{
::VirtualFree(p, 0, MEM_RELEASE);
}
}
public:
static size_t GetSize(void* p) throw()
{
MEMORY_BASIC_INFORMATION pbi = { 0 };
::VirtualQuery(p, &pbi, sizeof(pbi));
return pbi.RegionSize;
}
};
