StdioFile64

CStdioFile64.hpp

#include "StdAfx.h"

class CStdioFile64 : public CStdioFile
{
public:
	CStdioFile64(LPCTSTR lpszFileName, UINT nOpenFlags) : CStdioFile(lpszFileName, nOpenFlags){}
	virtual ~CStdioFile64(){};
	ULONGLONG Seek(LONGLONG lOff, UINT nFrom);
	ULONGLONG GetLength() const;
	ULONGLONG GetPosition() const;
};

ULONGLONG CStdioFile64::Seek(LONGLONG lOff, UINT nFrom)
{
	ASSERT_VALID(this);
	ASSERT(nFrom == begin || nFrom == end || nFrom == current);
	ASSERT(m_pStream != NULL);

	if (_fseeki64(m_pStream, lOff, nFrom) != 0)
		AfxThrowFileException(CFileException::badSeek, _doserrno,
		m_strFileName);

	return _ftelli64(m_pStream);
}

ULONGLONG CStdioFile64::GetLength() const
{
	ASSERT_VALID(this);

	LONGLONG nCurrent, nLength;
	int nResult;

	nCurrent = _ftelli64(m_pStream);
	if (nCurrent == -1)
		AfxThrowFileException(CFileException::invalidFile, _doserrno, m_strFileName);

	nResult = _fseeki64(m_pStream, 0, SEEK_END);
	if (nResult != 0)
		AfxThrowFileException(CFileException::badSeek, _doserrno, m_strFileName);

	nLength = _ftelli64(m_pStream);
	if (nLength == -1)
		AfxThrowFileException(CFileException::invalidFile, _doserrno, m_strFileName);
	nResult = _fseeki64(m_pStream, nCurrent, SEEK_SET);
	if (nResult != 0)
		AfxThrowFileException(CFileException::badSeek, _doserrno, m_strFileName);

	return nLength;
}

ULONGLONG CStdioFile64::GetPosition() const
{
	ASSERT_VALID(this);
	ASSERT(m_pStream != NULL);

	LONGLONG pos = _ftelli64(m_pStream);
	if (pos == -1)
		AfxThrowFileException(CFileException::invalidFile, _doserrno, m_strFileName);
	return pos;
}