project64/Source/Common/File Class.cpp

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#include "stdafx.h"
CFile::CFile() :
m_hFile(INVALID_HANDLE_VALUE),
m_bCloseOnDelete(false)
{
}
CFile::CFile(HANDLE hFile) :
m_hFile(hFile),
m_bCloseOnDelete(true)
{
if (hFile == 0)
{
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_ASSERTE(hFile != 0);
}
}
CFile::~CFile()
{
if (m_hFile != INVALID_HANDLE_VALUE && m_bCloseOnDelete)
{
Close();
}
}
CFile::CFile(LPCTSTR lpszFileName, ULONG nOpenFlags) :
m_hFile(INVALID_HANDLE_VALUE),
m_bCloseOnDelete(true)
{
Open(lpszFileName, nOpenFlags);
}
bool CFile::Open(LPCTSTR lpszFileName, ULONG nOpenFlags)
{
if (!Close())
{
return false;
}
if (lpszFileName == NULL || _tcslen(lpszFileName) == 0)
{
return false;
}
m_bCloseOnDelete = true;
m_hFile = INVALID_HANDLE_VALUE;
ULONG dwAccess = 0;
switch (nOpenFlags & 3)
{
case modeRead:
dwAccess = GENERIC_READ;
break;
case modeWrite:
dwAccess = GENERIC_WRITE;
break;
case modeReadWrite:
dwAccess = GENERIC_READ|GENERIC_WRITE;
break;
default:
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_ASSERTE(false);
}
COSVersion osver;
WORD ostype = osver.GetOSType();
BOOL is_NT =((ostype & OS_WINNT) != 0);
// map share mode
ULONG dwShareMode = 0;
dwShareMode = FILE_SHARE_READ | FILE_SHARE_WRITE;
if ((nOpenFlags & shareDenyWrite) == shareDenyWrite) { dwShareMode &= ~FILE_SHARE_WRITE; }
if ((nOpenFlags & shareDenyRead) == shareDenyRead) { dwShareMode &= ~FILE_SHARE_READ; }
if ((nOpenFlags & shareExclusive) == shareExclusive) { dwShareMode = 0; }
// map modeNoInherit flag
SECURITY_ATTRIBUTES sa;
sa.nLength = sizeof(sa);
sa.lpSecurityDescriptor = NULL;
sa.bInheritHandle = (nOpenFlags & modeNoInherit) == 0;
// map creation flags
ULONG dwCreateFlag = 0;
if (nOpenFlags & modeCreate)
{
if (nOpenFlags & modeNoTruncate)
dwCreateFlag = OPEN_ALWAYS;
else
dwCreateFlag = CREATE_ALWAYS;
}
else
dwCreateFlag = OPEN_EXISTING;
// attempt file creation
HANDLE hFile = ::CreateFile(lpszFileName, dwAccess, dwShareMode, is_NT ? &sa : NULL,
dwCreateFlag, FILE_ATTRIBUTE_NORMAL, NULL);
if (hFile == INVALID_HANDLE_VALUE)
{ //#define ERROR_PATH_NOT_FOUND 3L
//ULONG err = GetLastError();
return false;
}
m_hFile = hFile;
m_bCloseOnDelete = TRUE;
return TRUE;
}
bool CFile::Close()
{
bool bError = true;
if (m_hFile != INVALID_HANDLE_VALUE)
{
bError = !::CloseHandle(m_hFile);
}
m_hFile = INVALID_HANDLE_VALUE;
m_bCloseOnDelete = false;
return bError;
}
ULONG CFile::SeekToEnd ( void )
{
return Seek(0, CFile::end);
}
void CFile::SeekToBegin ( void )
{
Seek(0, CFile::begin);
}
bool CFile::IsOpen( void ) const
{
return m_hFile != INVALID_HANDLE_VALUE;
}
bool CFile::Flush()
{
if (m_hFile == INVALID_HANDLE_VALUE)
{
return true;
}
return ::FlushFileBuffers(m_hFile) != 0;
}
bool CFile::Write(const void* lpBuf, ULONG nCount)
{
if (nCount == 0)
{
return true; // avoid Win32 "null-write" option
}
ULONG nWritten = 0;
if (!::WriteFile(m_hFile, lpBuf, nCount, &nWritten, NULL))
{
return false;
}
if (nWritten != nCount)
{
// Win32s will not return an error all the time (usually DISK_FULL)
return false;
}
return true;
}
ULONG CFile::Read(void* lpBuf, ULONG nCount)
{
if (nCount == 0)
{
return 0; // avoid Win32 "null-read"
}
ULONG dwRead = 0;
if (!::ReadFile(m_hFile, lpBuf, nCount, &dwRead, NULL))
{
return 0;
}
return (UINT)dwRead;
}
long CFile::Seek(long lOff, SeekPosition nFrom)
{
ULONG dwNew = ::SetFilePointer(m_hFile, lOff, NULL, (ULONG)nFrom);
if (dwNew == (ULONG)-1)
{
return -1;
}
return dwNew;
}
ULONG CFile::GetPosition() const
{
return ::SetFilePointer(m_hFile, 0, NULL, FILE_CURRENT);
}
bool CFile::SetLength(ULONG dwNewLen)
{
Seek((LONG)dwNewLen, begin);
return ::SetEndOfFile(m_hFile) != 0;
}
ULONG CFile::GetLength() const
{
return GetFileSize(m_hFile,0);
}
bool CFile::SetEndOfFile()
{
return ::SetEndOfFile(m_hFile) != 0;
}