D:/opendownloadmanager/ODM-1.x/Hash/vmsFile.cpp

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/*
  Free Download Manager Copyright (c) 2003-2007 FreeDownloadManager.ORG
  Open Download Manager Copyright (c) 2008-2010 OpenDownloadManager.ORG
*/        

#include "vmsFile.h"
#include <string>        

vmsFile::vmsFile()
{
        m_hFile = INVALID_HANDLE_VALUE;
}

vmsFile::~vmsFile()
{
        Close ();
}

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

void vmsFile::Open(LPCSTR pszFile, BOOL bRead)
{
        Close ();

        m_hFile = CreateFile (pszFile, bRead ? GENERIC_READ : GENERIC_WRITE,
                bRead ? FILE_SHARE_READ : 0, NULL, OPEN_EXISTING, 0, NULL);
        if (m_hFile == INVALID_HANDLE_VALUE)
                throw "failed to open file";
}

void vmsFile::Create(LPCSTR pszFile)
{
        Close ();

        m_hFile = CreateFile (pszFile, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, 
                FILE_ATTRIBUTE_NORMAL, NULL);
        if (m_hFile == INVALID_HANDLE_VALUE)
                throw "failed to create file";
}

UINT64 vmsFile::get_Size()
{
        DWORD dwSizeHigh = 0;
        DWORD dwSizeLow; 
        
        dwSizeLow = GetFileSize (m_hFile, &dwSizeHigh);

        ULARGE_INTEGER uli; 
        uli.LowPart = dwSizeLow; uli.HighPart = dwSizeHigh;

        return uli.QuadPart;
}

DWORD vmsFile::Write(LPCVOID pb, DWORD dwSize)
{
        DWORD dw;
        if (FALSE == WriteFile (m_hFile, pb, dwSize, &dw, NULL))
                throw "failed to write to file";
        return dw;
}

DWORD vmsFile::Read(LPVOID lp, DWORD dwSize)
{
        DWORD dw;
        if (FALSE == ReadFile (m_hFile, lp, dwSize, &dw, NULL))
                throw "failed to read from file";
        return dw;
}

vmsFile::operator HANDLE() const
{
        return m_hFile;
}

DWORD vmsFile::get_Pos()
{
        return SetFilePointer (m_hFile, 0, NULL, FILE_CURRENT);
}

void vmsFile::set_Pos(DWORD dwPos, DWORD dwMethod)
{
        SetFilePointer (m_hFile, dwPos, NULL, dwMethod);
}

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