D:/opendownloadmanager/ODM-1.x/fsArchiveFileStream.cpp

Go to the documentation of this file.

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

#include "stdafx.h"
#include "fsArchiveFileStream.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif        

using namespace fsArchive;

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

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

int fsArchiveFileStream::Read(LPVOID buf, int cBytes)
{
        DWORD dwRead;

        if (FALSE == ReadFile (m_hFile, buf, cBytes, &dwRead, 
                        NULL))
                return -1;

        return dwRead;
}

int fsArchiveFileStream::Write(LPVOID buf, int cBytes)
{
        DWORD dwWritten;

        if (FALSE == WriteFile (m_hFile, buf, cBytes, &dwWritten, 
                        NULL))
                return -1;

        return dwWritten;
}

BOOL fsArchiveFileStream::Seek(UINT64 dist, fsSeekType met)
{
        DWORD dwMet;
        switch (met)
        {
                case ST_CURRENT:
                        dwMet = FILE_CURRENT;
                        break;

                case ST_END:
                        dwMet = FILE_END;
                        break;

                case ST_BEGIN:
                        dwMet = FILE_BEGIN;
                        break;

                default:
                        return FALSE;
        }

        return fsSetFilePointer (m_hFile, dist, dwMet);
}

DWORD fsArchiveFileStream::Open(LPCSTR pszFile, DWORD dwGenFlags)
{
        m_hFile = CreateFile (pszFile, dwGenFlags, FILE_SHARE_READ | FILE_SHARE_WRITE, 
                NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);

        if (m_hFile == INVALID_HANDLE_VALUE)
                return GetLastError ();

        return NOERROR;
}

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

void fsArchiveFileStream::Attach(HANDLE hFile)
{
        Close ();
        m_hFile = hFile;
}

HANDLE fsArchiveFileStream::Detach()
{
        HANDLE h = m_hFile;
        m_hFile = INVALID_HANDLE_VALUE;
        return h;
}

---