///////////////////////////////////////////////////////////////////
//	INCLUDE
///////////////////////////////////////////////////////////////////

#include "STDAFX.H"
#include "MEMORYMAP.H"
#include "COMMONMACROS.H"
#include "BASESET.H"
#include "DEBUGUTIL.H"
#include "SAFESTRINGMACROS.H"


#ifdef _DEBUG
#define new new(_NORMAL_BLOCK,__FILE__,__LINE__)
#endif

///////////////////////////////////////////////////////////////////
//	IMPLEMENTATION
///////////////////////////////////////////////////////////////////

//*---------------------------------------------------------------
// TYPE : FUNCTION
// NAME : CMemoryMap::CMemoryMap
//*---------------------------------------------------------------
// DESC : »ý¼ºÀÚ
// PARM : N/A
// RETV : N/A
// PRGM : B4nFter
//*---------------------------------------------------------------
CMemoryMap::CMemoryMap() :
	m_hFile(INVALID_HANDLE_VALUE),m_hMemoryMap(INVALID_HANDLE_VALUE),
	m_lpBaseAddr(0), m_dwSizeLow(0), m_dwSizeHigh(0)
{
}


//*---------------------------------------------------------------
// TYPE : FUNCTION
// NAME : CMemoryMap::~CMemoryMap
//*---------------------------------------------------------------
// DESC : ¼Ò¸êÀÚ
// PARM : N/A
// RETV : N/A
// PRGM : B4nFter
//*---------------------------------------------------------------
CMemoryMap::~CMemoryMap()
{
	Close();
}


//*---------------------------------------------------------------
// TYPE : FUNCTION
// NAME : CMemoryMap::Open
//*---------------------------------------------------------------
// DESC : Memory MapÀ¸·Î »ç¿ëÇÒ ÆÄÀÏÀ» Á¢±Ù, °³¹æ
// PARM :	1 . lpszFileName - Memory MapÀ¸·Î »ç¿ëÇÒ ÆÄÀÏÀÇ À̸§
//			2 . dwFileOffsetHigh - Á¢±ÙÇÏ°íÀÚ ÇÏ´Â ÆÄÀÏÀ§Ä¡ (»óÀ§DWORD)
//			3 . dwFileOffsetLow - Á¢±ÙÇÏ°íÀÚ ÇÏ´Â ÆÄÀÏÀ§Ä¡ (ÇÏÀ§DWORD)
//			4 . dwNumberOfBytesToMap - ¸ÅÇÎÇÏ°íÀÚ ÇÏ´Â ¹ÙÀÌÆ® ¼ö
//			5 . lpszMemoryMapName - Memory MapÀÇ À̸§
//			6 . dwDesiredAccess - Á¢±ÙÇÏ°íÀÚ ÇÏ´Â ¸ðµå
//			7 . dwCreationDisposition - ÆÄÀÏÀ» »ý¼ºÇÒ ¹æ½Ä (ex> CREATE_ALWAYS, OPEN_EXISTING µî)
// RETV : TRUE - ¼º°ø / FALSE - ½ÇÆÐ
// PRGM : B4nFter
//*---------------------------------------------------------------
BOOL CMemoryMap::Open(
					  LPCTSTR lpszFileName, 
					  DWORD dwFileOffsetHigh,  
					  DWORD dwFileOffsetLow, 
					  SIZE_T dwNumberOfBytesToMap,
					  LPCTSTR /*lpszMemoryMapName*/, 
					  DWORD dwDesiredAccess, 
					  DWORD dwCreationDisposition
					  )
{
	if (m_hFile != INVALID_HANDLE_VALUE) {
		return FALSE;
	}

	m_hFile = ::CreateFile(lpszFileName, dwDesiredAccess, FILE_SHARE_READ, 0, dwCreationDisposition, FILE_ATTRIBUTE_NORMAL, 0);
	if (m_hFile == INVALID_HANDLE_VALUE) {
		DN_TRACE(_T("m_hFile == INVALID_HANDLE_VALUE : %d - CMemoryMap::Open()"), GetLastError());
		return FALSE;
	}

	m_hMemoryMap = ::CreateFileMapping(m_hFile, 0, PAGE_WRITECOPY, 0, 0, 0);
	if (!m_hMemoryMap) {
		DN_TRACE(_T("!m_hMemoryMap : %d - CMemoryMap::Open()"), GetLastError());
		return FALSE;
	}

	m_lpBaseAddr = ::MapViewOfFile(m_hMemoryMap, FILE_MAP_COPY, dwFileOffsetHigh, dwFileOffsetLow, dwNumberOfBytesToMap);
	if (!m_lpBaseAddr) {
		DN_TRACE(_T("!m_lpBaseAddr : %d - CMemoryMap::Open()"), GetLastError());
		return FALSE;
	}

	m_dwSizeLow = ::GetFileSize(m_hFile, &m_dwSizeHigh);

	return TRUE;
}


//*---------------------------------------------------------------
// TYPE : FUNCTION
// NAME : CMemoryMap::Close
//*---------------------------------------------------------------
// DESC : Memory MapÀ¸·Î »ç¿ëÇÒ ÆÄÀÏÀ» ´ÝÀ½
// PARM : N/A
// RETV : N/A
// PRGM : B4nFter
//*---------------------------------------------------------------
VOID CMemoryMap::Close()
{
	if (m_lpBaseAddr != 0) {
		::UnmapViewOfFile(m_lpBaseAddr);
		m_lpBaseAddr = 0;
	}

	if (m_hMemoryMap != INVALID_HANDLE_VALUE) {
		::CloseHandle(m_hMemoryMap);
		m_hMemoryMap = INVALID_HANDLE_VALUE;
	}

	if (m_hFile != INVALID_HANDLE_VALUE)	{
		::CloseHandle(m_hFile);
		m_hFile = INVALID_HANDLE_VALUE;
	}

	m_dwSizeLow = 0;
	m_dwSizeHigh = 0;
}


//*---------------------------------------------------------------
// TYPE : FUNCTION
// NAME : CMemoryMap::ChangeMapView
//*---------------------------------------------------------------
// DESC : Memory MapÀÇ ºäÀÇ À§Ä¡¸¸ º¯°æ
// PARM :	1 . dwFileOffsetHigh - Á¢±ÙÇÏ°íÀÚ ÇÏ´Â ÆÄÀÏÀ§Ä¡ (»óÀ§DWORD)
//			2 . dwFileOffsetLow - Á¢±ÙÇÏ°íÀÚ ÇÏ´Â ÆÄÀÏÀ§Ä¡ (ÇÏÀ§DWORD)
//			3 . dwNumberOfBytesToMap - ¸ÅÇÎÇÏ°íÀÚ ÇÏ´Â ¹ÙÀÌÆ® ¼ö
// RETV : TRUE - ¼º°ø / FALSE - ½ÇÆÐ
// PRGM : B4nFter
//*---------------------------------------------------------------
BOOL CMemoryMap::ChangeMapView(
	DWORD dwFileOffsetHigh , 
	DWORD dwFileOffsetLow, 
	SIZE_T dwNumberOfBytesToMap
	)
{
	if (m_hFile == INVALID_HANDLE_VALUE) {
		return FALSE;
	}
	if (!m_hMemoryMap) {
		return FALSE;
	}
	if (m_lpBaseAddr != 0) {
		::UnmapViewOfFile(m_lpBaseAddr);
		m_lpBaseAddr = 0;
	}

	m_lpBaseAddr = ::MapViewOfFile(m_hMemoryMap, FILE_MAP_COPY, dwFileOffsetHigh, dwFileOffsetLow, dwNumberOfBytesToMap);
	if (!m_lpBaseAddr) {
		DN_TRACE(_T("!m_lpBaseAddr : %d - CMemoryMap::ChangeMapView()"), GetLastError());
		return FALSE;
	}

	return TRUE;
}


//*---------------------------------------------------------------
// TYPE : FUNCTION
// NAME : CMemoryMap::Flush
//*---------------------------------------------------------------
// DESC : Memory MapÀÇ ¹öÆÛ¸¦ ºñ¿ò (I/O ó¸®)
// PARM : N/A
// RETV : TRUE - ¼º°ø / FALSE - ½ÇÆÐ
// PRGM : B4nFter
//*---------------------------------------------------------------
BOOL CMemoryMap::Flush()
{
	if (::FlushViewOfFile(m_lpBaseAddr, 0) == FALSE) {
		DN_TRACE(_T("::FlushViewOfFile(m_lpBaseAddr, 0) == FALSE : %d - CMemoryMap::Open()"), GetLastError());
		return FALSE;
	}

	return TRUE;
}


//*---------------------------------------------------------------
// TYPE : FUNCTION
// NAME : CMemoryMap::GetBaseAddress
//*---------------------------------------------------------------
// DESC : Memory Map ÆÄÀÏÀÇ ±âº» ÁÖ¼Ò¸¦ ¾òÀ½
// PARM : N/A
// RETV : Memory Map ÆÄÀÏÀÇ ±âº» ÁÖ¼Ò
// PRGM : B4nFter
//*---------------------------------------------------------------
LPVOID CMemoryMap::GetBaseAddress()
{
	return m_lpBaseAddr;
}


//*---------------------------------------------------------------
// TYPE : FUNCTION
// NAME : CMemoryMap::GetSize
//*---------------------------------------------------------------
// DESC : Memory Map ÆÄÀÏÀÇ Å©±â¸¦ ¾òÀ½
// PARM : N/A
// RETV : Memory Map ÆÄÀÏÀÇ Å©±â (INT64)
// PRGM : B4nFter
//*---------------------------------------------------------------
UINT64 CMemoryMap::GetSize()
{
	return MAKELONGLONG(m_dwSizeLow, m_dwSizeHigh);
}