ULONGLONG CMultiFiles::Seek(LONGLONG lOff, UINT nFrom)
{
LARGE_INTEGER llNewPos;
LARGE_INTEGER llOff;
if (m_strFiles.GetCount() == 1)
{
llOff.QuadPart = lOff;
SetFilePointerEx (m_hFile, llOff, &llNewPos, nFrom);
return llNewPos.QuadPart;
}
else
{
LONGLONG lAbsolutePos = GetAbsolutePosition(lOff, nFrom);
int nNewPart = 0;
ULONGLONG llSum = 0;
while (m_FilesSize[nNewPart]+llSum <= lAbsolutePos)
{
llSum += m_FilesSize[nNewPart];
nNewPart++;
}
OpenPart (nNewPart);
llOff.QuadPart = lAbsolutePos - llSum;
SetFilePointerEx (m_hFile, llOff, &llNewPos, FILE_BEGIN);
return llSum + llNewPos.QuadPart;
}
}
BOOL CMultiFiles::Open(LPCTSTR lpszFileName, UINT nOpenFlags)
{
Reset();
m_strFiles.Add (lpszFileName);
return OpenPart(0);
}
BOOL CMultiFiles::OpenFiles(CAtlList<CHdmvClipInfo::PlaylistItem>& files, UINT nOpenFlags)
{
POSITION pos = files.GetHeadPosition();
LARGE_INTEGER llSize;
int nPos = 0;
REFERENCE_TIME rtDur = 0;
Reset();
while(pos)
{
CHdmvClipInfo::PlaylistItem& s = files.GetNext(pos);
m_strFiles.Add(s.m_strFileName);
if (!OpenPart(nPos)) return false;
llSize.QuadPart = 0;
GetFileSizeEx (m_hFile, &llSize);
m_llTotalLength += llSize.QuadPart;
m_FilesSize.Add (llSize.QuadPart);
m_rtPtsOffsets.Add (rtDur);
rtDur += s.Duration();
nPos++;
}
if (files.GetCount() > 1) ClosePart();
return TRUE;
}
UINT CMultiFiles::Read(void* lpBuf, UINT nCount)
{
DWORD dwRead;
do {
if (!ReadFile(m_hFile, lpBuf, nCount, &dwRead, NULL)) {
break;
}
if (dwRead != nCount && (m_nCurPart < 0 || (size_t)m_nCurPart < m_strFiles.GetCount()-1)) {
OpenPart (m_nCurPart+1);
lpBuf = (void*)((BYTE*)lpBuf + dwRead);
nCount -= dwRead;
}
} while (nCount != dwRead && (m_nCurPart < 0 || (size_t)m_nCurPart < m_strFiles.GetCount()-1));
return dwRead;
}
